Journal articles on the topic 'Erosioni'
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Cabras, Marco, Alessio Gambino, Dora Karimi, Roberto Broccoletti, and Paolo G. Arduino. "Erosioni multiple del cavo orale." Dental Cadmos 87, no. 06 (June 2019): 343. http://dx.doi.org/10.19256/d.cadmos.06.2019.03.
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Sarraj, A., G. Mergoni, M. Manfredi, E. Merigo, M. Meleti, T. Simonazzi, I. Giovannacci, E. Silini, and P. Vescovi. "Placche ed erosioni della mucosa orale associate a disturbi intestinali." Dental Cadmos 83, no. 2 (February 2015): 67–68. http://dx.doi.org/10.1016/s0011-8524(15)70268-0.
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Derchi, G., V. Borgia, M. Manca, A. Barone, and U. Covani. "Trattamento delle erosioni dentali con tecniche adesive: provvisorizzazione immediata estetico-funzionale. Caso clinico." Dental Cadmos 85, no. 02 (February 2017): 98. http://dx.doi.org/10.19256/d.cadmos.02.2017.07.
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Picornell, Mercè. "Contra l'alteritat. L'erosió de la dicotomia jo/altre a «La pell de la frontera» (2016), de Francesc Serés." Caplletra. Revista Internacional de Filologia, no. 65 (September 28, 2018): 151. http://dx.doi.org/10.7203/caplletra.65.12617.
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En aquest article em propòs reflexionar sobre la recerca de mecanismes de representació literària de la diferència cultural i econòmica que es proposen erosionar la separació que justifica la dicotomia jo/altre. Ho faré a partir de l'estudi d'un cas concret: el volum La pell de la frontera (2014) de Francesc Serés. Aquest llibre contribuí a difondre la situació desesperada de molts migrants, així com també a denunciar la desatenció institucional davant d’uns canvis socials, econòmics i demogràfics que han modificat d’arrel la composició de molts pobles del Baix Cinca i del Segrià. En la meva lectura partiré de la hipòtesi que la representació dels objectes emprats i dels escenaris ruïnosos serveix a Serés per bastir un relat sobre el contacte amb la diferència que erosioni la barra mateixa de la dicotomia jo/altre. Estructuraré la meva interpretació en tres parts, on estudiaré: a) el procés de desplaçament de la posició d'autor, b) l’ús dels objectes usats com a lloc de contacte amb un altre que no es vol representar com a tal i c) l'erosió de la identitat de l'autor i de la representativitat de l'altre en un marc col·lectiu.
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Riccitiello, F., R. Valentino, D. A. Telesca, S. Ruggiero, A. Riccitiello, and L. Sivero. "Prevalenza di erosioni dentali e lesioni esofagee in pazienti affetti da malattia da reflusso gastroesofageo." Dental Cadmos 85, no. 03 (March 2017): 170. http://dx.doi.org/10.19256/d.cadmos.03.2017.08.
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Perl, M., C. Levy, and Q. Ma. "The Influence of Multiple Axial Erosions on the Fatigue Life of Autofrettaged Pressurized Cylinders." Journal of Pressure Vessel Technology 123, no. 3 (February 5, 2001): 293–97. http://dx.doi.org/10.1115/1.1372325.
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Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from an erosion’s deepest point in a multiply eroded, autofrettaged, pressurized, thick-walled cylinder are investigated. The problem is simulated as a two-dimensional problem and is solved via the finite element method. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs are evaluated for a variety of relative crack lengths, a0/t=0.01-0.45 emanating from the tip of erosions of different geometries, namely, (a) semi-circular erosions of relative depths of 1–10 percent of the cylinder’s wall thickness, t; (b) arc erosions for several dimensionless radii of curvature, r′/t=0.05-0.4; and (c) semi-elliptical erosions with ellipticities of d/h=0.5-1.5, and erosion span angle, α, from 6 deg to 360 deg. The effective SIF for relatively short cracks is found to be increased by the presence of the erosion, which in turn may result in a significant decrease in the vessel’s fatigue life of up to an order of magnitude. Deep cracks are found to be almost unaffected by the erosion.
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Levy, C., M. Perl, and H. Fang. "Cracks Emanating From an Erosion in a Pressurized Autofrettaged Thick-Walled Cylinder—Part I: Semi-Circular and Arc Erosions." Journal of Pressure Vessel Technology 120, no. 4 (November 1, 1998): 349–53. http://dx.doi.org/10.1115/1.2842342.
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Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the erosion’s deepest point in an autofrettaged, pressurized, thick-walled cylinder are investigated. The problem is solved via the FEM method and knowledge of the asymptotic behavior of short cracks. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs are evaluated for a variety of relative crack lengths, a0/W = 0.01 – 0.45, emanating from the tip of erosions of different geometries. In Part I of this paper, two configurations are considered: (a) semi-circular erosions of relative depths of 5 percent of the cylinder’s wall thickness, W; and (b) arc erosions for several dimensionless radii of curvature, r′/W = 0.05 – 0.4. While deep cracks are almost unaffected by the erosion, the effective SIF for relatively short cracks is found to be significantly enhanced by the presence and geometry of the erosion and might reduce the vessel’s fatigue life.
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Levy, C., M. Perl, and Q. Ma. "The Influence of Multiple Axial Erosions on a Three-Dimensional Crack in Determining the Fatigue Life of Autofrettaged Pressurized Cylinders." Journal of Pressure Vessel Technology 124, no. 1 (May 22, 2001): 1–6. http://dx.doi.org/10.1115/1.1386656.
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Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from an erosion’s deepest point in a multiply eroded, autofrettaged, pressurized, thick-walled cylinder are investigated. The problem is solved via the finite element method (FEM). Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs are evaluated for a variety of relative crack depths, a0/t=0.01-0.40, and crack ellipticities, a0/c=0.5-1.5, emanating from the tip of erosions of different geometry, namely: (a) semi-circular erosions of relative depths of 1–10 percent of the cylinder’s wall thickness, t; (b) arc erosions for several dimensionless radii of curvature, r′/t=0.05-0.4; and (c) semi-elliptical erosions with ellipticities of d/h=0.3-2.0. The erosion separation angle, α, is taken from 7 to 360 deg. Deep cracks are found to be almost unaffected by the erosion. The effective SIF for relatively short cracks is enhanced by the presence, separation distance and geometry of the erosion, as well as the crack geometry, and may result in a significant decrease in the vessel’s fatigue life of up to an order of magnitude.
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Levy, C., M. Perl, and Q. Ma. "The Influence of Finite Three-Dimensional Multiple Axial Erosions on the Fatigue Life of Partially Autofrettaged Pressurized Cylinders." Journal of Pressure Vessel Technology 125, no. 4 (November 1, 2003): 379–84. http://dx.doi.org/10.1115/1.1616582.
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Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the farthest erosion’s deepest point in a multiply, finite-length or full-length eroded, partially autofrettaged, pressurized, thick-walled cylinder is investigated. The problem is solved via the FEM method. Autofrettage, based on von Mises’ yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs were evaluated for a variety of relative crack depths, a/t=0.01-0.30 and crack ellipticities, a/c=0.5-1.5 emanating from the tip of the erosion of various geometries, namely, (a) semi-circular erosions of relative depths of 1–10% of the cylinder’s wall thickness, t; (b) arc erosions for several dimensionless radii of curvature, r′/t=0.05-0.3; and (c) semi-elliptical erosions with ellipticities of d/h=0.5-1.5. In the cases of finite erosions, the semi-erosion length to the semi-crack length, Le/c, was between two and ten, erosion angular spacing, α, was between 7 and 120 degrees, whereas percent autofrettage investigated included 30%, 60%, and 100%. The normalized SIFs and the normalized effective SIFs of a crack emanating from the farthest finite erosion are found to rise sharply for values of Le/c<3. Both the normalized SIF and normalized effective SIF values are mitigated as the amount of partial autofrettage increases with the most rapid decrease occurring between 0–60% autofrettage. The purpose of this study is to detail these findings.
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Sharma, Rohit, Ashish Mehrotra, Vinit K. Sharma, Zafar Iqbal, and Kunal Nigam. "A Retrospective Study of Bony Erosion Patterns in Cases of Fungal Rhinosinusitis." An International Journal Clinical Rhinology 9, no. 2 (2016): 62–64. http://dx.doi.org/10.5005/jp-journals-10013-1269.
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ABSTRACT Erosion of bone with or without extension of disease into adjacent anatomic spaces is observed among some patients with fungal rhinosinusitis (FRS). Preoperative computed tomographies is very important to determine the sites of bony erosion. Patients with bony erosions are classified based on the involved subsite and the extent of erosion. Bony erosions was seen in 37.5% cases. Six patients were having bone erosions on CT scan. 40 % erosions were present in patients belonging to younger age group. Erosion of sinus boundaries were more common in male patients (60%). The ethmoid sinus complex was most commonly involved (46.6%). This was followed in frequency of involvement by the maxillary sinus (26.6%), the sphenoid sinus (20%) and the frontal sinus (6.6%). The most common site of erosion was the lamina papyracea (33.3%), followed by the medial maxillary wall (20%). Bony erosions due to FRS were mainly due to long-term mechanical compression by the fungal mass. A case of chronic rhinosinusitis with bony erosions in CT scan may indicate a fungal etiology. How to cite this article Sharma VK, Sharma R, Mehrotra A, Iqbal Z, Nigam K. A Retrospective Study of Bony Erosion Patterns in Cases of Fungal Rhinosinusitis. Clin Rhinol An Int J 2016;9(2):62-64.
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Srikhum, Waraporn, Warapat Virayavanich, Andrew J. Burghardt, Andrew Yu, Thomas M. Link, John B. Imboden, and Xiaojuan Li. "Quantitative and Semiquantitative Bone Erosion Assessment on High-resolution Peripheral Quantitative Computed Tomography in Rheumatoid Arthritis." Journal of Rheumatology 40, no. 4 (February 15, 2013): 408–16. http://dx.doi.org/10.3899/jrheum.120780.
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Objective.To develop novel quantitative and semiquantitative bone erosion measures at metacarpophalangeal (MCP) and wrist joints in patients with rheumatoid arthritis (RA) using high-resolution peripheral quantitative computed tomography (HR-pQCT), and to correlate these measurements with disease duration and bone marrow edema (BME) patterns derived from magnetic resonance imaging (MRI).Methods.Sixteen patients with RA and 7 healthy subjects underwent hand and wrist HR-pQCT and 3-Tesla MRI. Bone erosions of the MCP2, MCP3, and distal radius were evaluated by measuring maximal erosion dimension on axial slices, which is a simple and fast measurement, and then were graded (grades 0–3) based on the maximal dimension. Correlation coefficients were calculated between (1) sum maximal dimensions, highest grades, and sum grades of bone erosions; (2) erosion measures and the clinical evaluation; (3) erosion measures and BME volume in distal radius.Results.The inter- and intrareader agreements of maximal erosion dimensions were excellent (intraclass correlation coefficients 0.89, 0.99, and root mean square error 9.4%, 4.7%, respectively). Highest grades and sum grades were significantly correlated to sum maximal dimensions of all erosions. Number of erosions, sum maximal erosion dimensions, highest grades, and sum grades correlated significantly with disease duration. Number of erosions, sum maximal dimensions, and erosion grading of the distal radius correlated significantly with BME volume.Conclusion.HR-pQCT provides a sensitive method with high reader agreement in assessment of structural bone damage in RA. The good correlation of erosion measures with disease duration as well as BME volume suggests that they could become feasible measures of erosions in RA.
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Levy, C., M. Perl, and Q. Ma. "Erosions and Their Effect on the Fatigue Life of Thick Walled, Autofrettaged, Pressurized Vessels." Journal of Pressure Vessel Technology 125, no. 3 (August 1, 2003): 242–47. http://dx.doi.org/10.1115/1.1593698.
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This paper summarizes the results that have been found in evaluating the effect of erosions on thick walled, autofrettaged, pressurized, cracked vessels. The problem is solved numerically via the FEM method. Autofrettage, based on von Mises yield criterion, is simulated by thermal loading and stress intensity factors (SIF’s) are determined by the nodal displacement method. SIF’s were evaluated for a variety of relative crack depths a/t and crack ellipticities a/c emanating from the tip of the erosion of various geometries, namely, (a) semi-circular erosions of small relative depths of the cylinder’s wall thickness t; (b) arc erosions for several dimensionless radii of curvature r′/t; and (c) semi-elliptical erosions with ellipticities of d/h. Other parameters evaluated were, in the cases of finite erosions, the semi-erosion length to the semicrack length Le/c, the erosion angular spacing α, and the autofrettage level. First, we summarize the differences found between a vessel with one erosion and one with multiple erosions. We show that for full cylinder length erosions, the erosions tend to make smaller cracks more dangerous than larger cracks in fully autofrettaged vessels and that as the crack grows the stress intensity factor initially decreases. We then show that as the crack grows further, the effect is to increase the effective stress intensity factor (SIF) but also to practically void the existence of the erosion. We show further that lower levels of autofrettage will lead to higher effective SIF’s but that partially eroded cylinders (cylinders where erosions are a fraction of the cylinder length) lead to lower SIF’s. Affecting these values in all cases, of course, are the erosion geometry and depth as well as the crack geometry and depth.
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Lau, Hui-Hsuan, Quan-Bin Jou, Wen-Chu Huang, and Tsung-Hsien Su. "Amniotic Membrane Graft in the Management of Complex Vaginal Mesh Erosion." Journal of Clinical Medicine 9, no. 2 (January 28, 2020): 356. http://dx.doi.org/10.3390/jcm9020356.
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Vaginal mesh erosion is a devastating complication after pelvic floor mesh surgery and it can be treated conservatively or with surgical revision. However, the management options following a failed primary revision or complex vaginal erosions are very limited. The aim of this study is to describe a novel treatment using an amniotic membrane as an inlay graft for such patients. Eight patients who failed conservative or primary surgical revision were enrolled. The complex erosions included vaginal agglutination, multiple vaginal erosions, recurrent erosions, and mesh cutting through the urethra. We used an amniotic membrane as a graft to cover the vaginal defect after partial excision of the mesh erosion and we describe the technique in this study. There were no intraoperative complications and none of the patients reported any further symptoms at a mean of 27 months follow-up. Only one patient had recurrent erosion, however, the erosion size was narrower and was subsequently successfully repaired. No further vaginal mesh erosions were noted in the other patients who all had good functional recovery. The use of an amniotic graft can be an economic and alternative method in the management of complex vaginal mesh erosions.
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Perl, M., C. Levy, and H. Fang. "Cracks Emanating From an Erosion in a Pressurized Autofrettaged Thick-Walled Cylinder—Part II: Erosion Depth and Ellipticity Effects." Journal of Pressure Vessel Technology 120, no. 4 (November 1, 1998): 354–58. http://dx.doi.org/10.1115/1.2842343.
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In Part I of this paper, the effects of constant depth erosion on the mode I stress intensity factor (SIF) were determined for a crack emanating from the erosion deepest point in a pressurized, autofrettaged, thick-walled cylinder. The erosion geometries investigated included semi-circular erosions and several arc erosions of various radii of curvature. Due to the trends found in that portion of the study, erosion depth and ellipticity are believed to have equally important impact on the SIFs. The present paper delves further into these two parameters using the following configurations: (a) semi-circular erosions of relative depths of 1–10 percent of the cylinder’s wall thickness, W; and (b) semi-elliptical erosions with ellipticities of d/h = 0.3 – 2.0. Deep cracks are found to be practically unaffected by the erosion, similar to the results presented in Part I of the paper. The effective SIF for relatively short cracks is found to be dramatically enhanced by the stress concentration factor (SCF), which encompasses the depth of the erosion as well as its radius of curvature at the tip. As a result of the increased effective SIF, a significant decrease in the vessel’s fatigue life of up to an order of magnitude may occur.
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Barnabe, Cheryl, Dominique Toepfer, Hubert Marotte, Ellen-Margrethe Hauge, Andrea Scharmga, Roland Kocijan, Sebastian Kraus, et al. "Definition for Rheumatoid Arthritis Erosions Imaged with High Resolution Peripheral Quantitative Computed Tomography and Interreader Reliability for Detection and Measurement." Journal of Rheumatology 43, no. 10 (October 2016): 1935–40. http://dx.doi.org/10.3899/jrheum.160648.
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Objective.High-resolution peripheral quantitative computed tomography (HR-pQCT) sensitively detects erosions in rheumatoid arthritis (RA); however, nonpathological cortical bone disruptions are potentially misclassified as erosive. Our objectives were to set and test a definition for pathologic cortical bone disruptions in RA and to standardize reference landmarks for measuring erosion size.Methods.HR-pQCT images of metacarpophalangeal joints of RA and control subjects were used in an iterative process to achieve consensus on the definition and reference landmarks. Independent readers (n = 11) applied the definition to score 58 joints and measure pathologic erosions in 2 perpendicular multiplanar reformations for their maximum width and depth. Interreader reliability for erosion detection and variability in measurements between readers [root mean square coefficient of variation (RMSCV), intraclass correlation (ICC)] were calculated.Results.Pathologic erosions were defined as cortical breaks extending over a minimum of 2 consecutive slices in perpendicular planes, with underlying trabecular bone loss and a nonlinear shape. Interreader agreement for classifying pathologic erosions was 90.2%, whereas variability for width and depth erosion assessment was observed (RMSCV perpendicular width 12.3%, axial width 20.6%, perpendicular depth 24.0%, axial depth 22.2%; ICC perpendicular width 0.206, axial width 0.665, axial depth 0.871, perpendicular depth 0.783). Mean erosion width was 1.84 mm (range 0.16–8.90) and mean depth was 1.86 mm (range 0.30–8.00).Conclusion.We propose a new definition for erosions visualized with HR-pQCT imaging. Interreader reliability for erosion detection is good, but further refinement of selection of landmarks for erosion size measurement, or automated volumetric methods, will be pursued.
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Geerling, Gerd, Walter Lisch, and David Finis. "Rezidivierende Hornhauterosion bei epithelialen Hornhautdystrophien." Klinische Monatsblätter für Augenheilkunde 235, no. 06 (June 2018): 697–701. http://dx.doi.org/10.1055/a-0611-5783.
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ZusammenfassungDas Hornhautepithel stellt die wesentliche abbildende Struktur des optischen Systems dar. Rezidivierende Hornhauterosionen können durch Entzündung, Trauma, Degenerationen und Dystrophien verursacht werden. Die epitheliale Basalmembrandystrophie (EBMD), die epitheliale rezidivierende Erosionsdystrophie (ERED) nach Francheschetti und die Meesmannʼsche epitheliale Hornhautdystrophie (MECD) führen jenseits unterschiedlicher Symptome und klinischer Zeichen – bedingt durch verschiedene Pathomechanismen – mehr oder weniger häufig zu einer Erosio corneae. Diese treten bei der EBMD fakultativ auf, wobei jedoch das Krankheitsbild der EBMD sehr versteckt sein kann. Die histologische Ursache der Erosion sind häufig aberrante Basalmembranen, die zu einer umschriebenen Verdünnung des Epithels führen können und klinisch als „Maps“ oder „Fingerprints“ imponieren. Bei der ERED sind rezidivierende Erosionen obligat, vor allem in den ersten Lebensdekaden und auf Störungen der Hemidesmosomen durch das COL17A1-Gen zurückzuführen. Fakultative, seltene, punktförmige Erosionen im Rahmen der MECD entstehen histologisch durch Öffnen der Mikrozysten an der Hornhautepitheloberfläche. Die Therapie der rezidivierenden Erosio bei allen spezifischen Dystrophien überschreitet selten die Therapietrias aus Benetzungsmitteln, therapeutischen Kontaktlinsen und ggf. Abrasio und phototherapeutischer Keratektomie.
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Touma, Zahi, Arane Thavaneswaran, Vinod Chandran, Fawnda Pellett, Richard J. Cook, and Dafna D. Gladman. "Clinical and Demographic Characteristics of Erosion-free and Erosion-present Status in Psoriatic Arthritis in a Cohort Study." Journal of Rheumatology 43, no. 6 (April 1, 2016): 1057–62. http://dx.doi.org/10.3899/jrheum.150466.
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Objective.Psoriatic arthritis (PsA) has been recognized as a severe erosive disease. However, some patients do not develop erosions. We aimed to determine the prevalence, characteristics, and predictors of erosion-free patients (EFP) as compared with erosion-present patients (EPP) among patients with PsA followed prospectively.Methods.This is a retrospective analysis conducted on patients from the Toronto PsA cohort. Patients with at least 10 years of followup and radiographs were analyzed. Radiographs were scored with the modified Steinbrocker method. Baseline (first visit to clinic) characteristics were used to predict the development of erosions with logistic regression models. To examine the effect of time-varying covariates, Cox regression models were fit for the time to development of erosions from baseline.Results.Among 290 patients, 12.4% were EFP and 87.6% were EPP over the study period. The mean time to development of erosion in the EPP over the course of followup was 6.8 ± 6.1 years. EFP were diagnosed with psoriasis at a younger age compared with EPP. In both models, actively inflamed joints and clinically damaged joints were predictive of the development of erosion, whereas a longer duration of psoriasis at baseline decreased the odds of developing erosion. EPP had a higher percentage of unemployment as compared with EFP at baseline and followup visits.Conclusion.Among patients with PsA followed for at least 10 years, 12.4% never develop erosions. The clinical and radiographic findings can ultimately assist in the stratification of a patient’s prognosis regarding the development of erosions.
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Forslind, Kristina, Kerstin Eberhardt, and Björn Svensson. "Repair of Erosions in Patients with Rheumatoid Arthritis." Journal of Rheumatology 46, no. 7 (February 1, 2019): 670–75. http://dx.doi.org/10.3899/jrheum.180557.
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Objective.The aim of this study was to examine the occurrence of repair in a cohort of conventionally treated patients with early rheumatoid arthritis over 8 years.Methods.There were 395 patients included in the BARFOT study having radiographs of hands and feet at inclusion, and at 1, 2, 5, and 8 years, which were chronologically scored for erosions by the Sharp/van der Heijde method. An erosion with repair was defined as an erosion that has become partially or totally filled, with or without sclerosis.Results.Erosions with repair were observed in 64 patients (16%) at 1 year, 113 (29%) at 2 years, 142 (36%) at 5 years, and 200 (51%) at 8 years. At the 1-year visit, 13% of the patients with at least 1 new erosion showed repair versus 3% of the patients with no new erosions (p = 0.001). At 2, 5, and 8 years the corresponding figures were 22% and 6%, 28% and 8%, and 39% and 11%, respectively (all p = 0.001). The sum of all repaired erosions correlated strongly with the sum of all erosions and with the sum of all erosion scores (ρ = 0.79 and 0.77). Presence of rheumatoid factor (RF) and anticyclic citrullinated peptide antibodies (anti-CCP) was significantly associated with both new erosions and repair.Conclusion.Repair was more common than previously described. The frequency of repair increased over time and was associated with the number of erosions. RF- and anti-CCP–positivity, patient age, and presence of erosions at baseline were independent predictors of repair.
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Shiraishi, Kazuteru, Ko Chiba, Kounosuke Watanabe, Nozomi Oki, Naoki Iwamoto, Shoken Amano, Akihiko Yonekura, et al. "Analysis of bone erosions in rheumatoid arthritis using HR-pQCT: Development of a measurement algorithm and assessment of longitudinal changes." PLOS ONE 17, no. 4 (April 26, 2022): e0265833. http://dx.doi.org/10.1371/journal.pone.0265833.
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Purpose The purpose of this study was to establish an algorithm for measuring bone erosions at metacarpophalangeal (MCP) joints using high-resolution peripheral quantitative computed tomography (HR-pQCT), to investigate the precision of measurements, and to assess longitudinal changes in bone erosions among patients with rheumatoid arthritis (RA). Methods The 2nd and 3rd MCP joints were scanned at a voxel size of 60.7 μm using second-generation HR-pQCT. Bone erosions on MCP joints were identified using a semi-automated algorithm we developed, and each erosion parameter was measured. Measurement reproducibility was evaluated in 19 healthy subjects using intraclass correlation coefficients (ICCs) and root mean square percent coefficient of variance (RMS%CV). Finally, longitudinal changes in bone erosions over a period of 12 months were assessed in 26 patients with RA based on the calculated least significant change (LSC). Results Reproducibilities for measurement parameters regarding bone erosions with our algorithm were good (all ICCs ≥ 0.98; all RMS%CVs < 5%). No erosion parameters showed significant changes after 12 months of treatment in terms of median values in all erosions, while both progression and repair of erosions were observed individually (e.g., erosion volume: progression, 26% (+0.62 mm3); repair, 34% (-0.85 mm3); no change, 40%). Conclusions The measurement algorithm developed for bone erosions at MCP joints showed good reproducibility. Both progression and repair of bone erosions were observed in patients with RA even after 12 months of appropriate treatment. Our algorithm may be useful to investigate the etiology of RA and assess drug efficacy.
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Shiraishi, Kazuteru, Ko Chiba, Kounosuke Watanabe, Nozomi Oki, Naoki Iwamoto, Shoken Amano, Akihiko Yonekura, et al. "Analysis of bone erosions in rheumatoid arthritis using HR-pQCT: Development of a measurement algorithm and assessment of longitudinal changes." PLOS ONE 17, no. 4 (April 26, 2022): e0265833. http://dx.doi.org/10.1371/journal.pone.0265833.
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Purpose The purpose of this study was to establish an algorithm for measuring bone erosions at metacarpophalangeal (MCP) joints using high-resolution peripheral quantitative computed tomography (HR-pQCT), to investigate the precision of measurements, and to assess longitudinal changes in bone erosions among patients with rheumatoid arthritis (RA). Methods The 2nd and 3rd MCP joints were scanned at a voxel size of 60.7 μm using second-generation HR-pQCT. Bone erosions on MCP joints were identified using a semi-automated algorithm we developed, and each erosion parameter was measured. Measurement reproducibility was evaluated in 19 healthy subjects using intraclass correlation coefficients (ICCs) and root mean square percent coefficient of variance (RMS%CV). Finally, longitudinal changes in bone erosions over a period of 12 months were assessed in 26 patients with RA based on the calculated least significant change (LSC). Results Reproducibilities for measurement parameters regarding bone erosions with our algorithm were good (all ICCs ≥ 0.98; all RMS%CVs < 5%). No erosion parameters showed significant changes after 12 months of treatment in terms of median values in all erosions, while both progression and repair of erosions were observed individually (e.g., erosion volume: progression, 26% (+0.62 mm3); repair, 34% (-0.85 mm3); no change, 40%). Conclusions The measurement algorithm developed for bone erosions at MCP joints showed good reproducibility. Both progression and repair of bone erosions were observed in patients with RA even after 12 months of appropriate treatment. Our algorithm may be useful to investigate the etiology of RA and assess drug efficacy.
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Roncallo, F., I. Turtulici, A. Bartolini, G. Margarino, P. Mereu, F. Scasso, L. Scotto Di Santillo, A. Santelli, G. Garaventa, and A. Tedeschi. "Tomografia computerizzata e risonanza magnetica nella patologia del distretto testa-collo." Rivista di Neuroradiologia 9, no. 3 (June 1996): 301–20. http://dx.doi.org/10.1177/197140099600900306.
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La patologia neoplastica maligna del distretto-testa collo presenta un notevole polimorfismo istologico, in rapporto ai diversi tessuti fisiologicamente presenti. La grande maggioranza concerne comunque i carcinomi e tra questi prevale il carcinoma a cellule squamose. Nella prognosi e nella scelta e pianificazione del trattamento assumono una importanza decisiva l'estensione del tumore primitivo e l'eventuale presenza ed entità del coinvolgimento linfonodale. In base al quesito clinico sono stati preliminarmente distinte diverse categorie di esami TC e RM. Le immagini ottenute sono state interpretate sulla base di un criterio anatomo-topografico che separa diversi spazi fasciali nell'ambito delle regioni sopra- e sottoioidea del distretto testa- collo. È stata quindi effettuata una valutazione comparativa delle informazioni ottenute dagli esami clinico-endoscopici e dalla diagnostica per immagini. TC e RM consentono una stadiazione completa dei carcinomi sia su T, perchè sono in grado di documentare lo sviluppo profondo sottomucoso e nell'ambito degli spazi fasciali limitrofi, nonchè la diffusione perineurale, perivascolare e le erosioni osteocartilaginee, parametri non analizzabili dall'endoscopia, sia su N, perchè svelano linfoadenopatie che per dimensioni e soprattutto per sede sono occulte all'esame clinico. Al contrario lesioni non rilevate mucose superficiali possono risultare del tutto mute alla diagnostica per immagini, così come è pressochè impossibile formulare una corretta caratterizzazione tissutale delle ipertrofie anche spiccate degli spazi mucosi rino- ed orofaringeo, informazioni che sono esaustivamente ottenibili dagli esami endoscopico-bioptici. Pertanto TC e RM hanno un notevole impatto nella stadiazione dei carcinomi del distretto testa-collo, ma il loro utilizzo va effettuato sempre complementariamente e successivamente ad esame clinico specialistico del paziente ed indagine endoscopica delle vie aerodigestive superiori.
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Ali, Muhammad, Saima Attiq, Sayed Nusrat Raza, Abdul Hakim, Shakeel Ahmed, Shaukat Ali, Farhan Akbar, and Syed Waqar Abbas. "FREQUENCY OF BONE EROSION ON COMPUTERIZED TOMOGRAPGHY SCAN IN ALLERGIC FUNGAL RHINOSINUSITIS." PAFMJ 71, Suppl-3 (December 30, 2021): S428–31. http://dx.doi.org/10.51253/pafmj.v1i1.4159.
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Objective: To analyze the frequency and sites of bone erosion on computerized tomograghy scan in Allergic Fungal Rhinosinustis in Pakistan.
Study Design: Retrospective observational study.
Place and Duration of Study: Department of ENT, Combined Military Hospital Lahore, Malir Karachi and Rawalpindi, from Jan 2010 to Dec 2019.
Methodology: Total 230 cases of Allergic Fungal Rhinosinusitis were screened, out of which 85 patients having bone erosions on computerized tomograpghy scan were included in the study. Bone erosion in different paranasal sinuses and their sub sites were evaluated. Depending upon the number of bone erosion, patients were divided into three categories as mild, moderate and severe. Those having erosion at a single site were labelled as mild, those with two sub sites of erosion as moderate and those with more than two subsites of erosion were labelled as severe cases.
Results: Detailed evaluation of computerized tomography scan of paranasal sinuses revealed bone erosion in 85/230 (36.9%) cases. Mean affected age was 23.96 ± 12.71 years. There were 52 (61.1%) males and 33 (38.9%) females. Ethmoid sinus was the most commonly involved sinus to have bone erosions 55 (38.19%) followed by maxillary sinus 38 (26.38%) then sphenoid sinus 27 (18.75%) and lastly frontal sinus 24 (16.6%). Out of 85 patients 48 (56.1%) were having mild, 22 (25.8%) moderate and 15 (17.6%) had severe disease.
Conclusion: Allergic Fungal Rhinosinusitis has high frequency of bone erosion. Computerized tomography scan is an important and effective investigation in finding these bony erosions and ethmoid sinus is the.....
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Chabernaud Negrier, Amandine, Lokmane Taihi, Eric Vicaut, Pascal Richette, Thomas Bardin, Frédéric Lioté, Hang-Korng Ea, and Valérie Bousson. "Distribution of bony erosions in feet and performance of two bone erosion scores: A dual-energy computed tomography study of 61 patients with gout." PLOS ONE 16, no. 11 (November 2, 2021): e0259194. http://dx.doi.org/10.1371/journal.pone.0259194.
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Objectives To assess the distribution of bone erosions and two erosion scores in the feet of patients with gout and analyze the association between erosion scores and monosodium urate (MSU) crystal deposition using dual-energy computed tomography (DECT). Materials and methods We included all patients who underwent DECT of both feet between 2016 and 2019 in our radiology department, with positive detection of MSU deposits. Data on sex, age, treatment, serum urate, and DECT urate volumes were obtained. CT images were analyzed to score bone erosions in 31 sites per foot by using the semi-quantitative method based on the Rheumatoid Arthritis MRI Scoring (RAMRIS) system and the Dalbeth-simplified score. Reproducibility for the two scores was calculated with intraclass correlation coefficients (ICCs). Correlations between clinical features, erosion scores and urate crystal volume were analyzed by the Spearman correlation coefficient (r). Results We studied 61 patients (mean age 62.0 years); 3,751 bones were scored. The first metatarsophalangeal joint and the midfoot were the most involved in terms of frequency and severity of bone erosions. The distribution of bone erosions was not asymmetrical. The intra- and inter-observer reproducibility was similar for the RAMRIS and Dalbeth-simplified scores (ICC 0.93 vs 0.94 and 0.96 vs 0.90). DECT urate volume was significantly correlated with each of the two erosion scores (r = 0.58–0.63, p < 0.001). There was a high correlation between the two scores (r = 0.96, p < 0.001). Conclusions DECT demonstrates that foot erosions are not asymmetric in distribution and predominate at the first ray and midfoot. The two erosion scores are significantly correlated with DECT urate volume. An almost perfect correlation between the RAMRIS and Dalbeth-simplified scores is observed.
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Ganti, Vamsi, Christoph von Hagke, Dirk Scherler, Michael P. Lamb, Woodward W. Fischer, and Jean-Philippe Avouac. "Time scale bias in erosion rates of glaciated landscapes." Science Advances 2, no. 10 (October 2016): e1600204. http://dx.doi.org/10.1126/sciadv.1600204.
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Deciphering erosion rates over geologic time is fundamental for understanding the interplay between climate, tectonic, and erosional processes. Existing techniques integrate erosion over different time scales, and direct comparison of such rates is routinely done in earth science. On the basis of a global compilation, we show that erosion rate estimates in glaciated landscapes may be affected by a systematic averaging bias that produces higher estimated erosion rates toward the present, which do not reflect straightforward changes in erosion rates through time. This trend can result from a heavy-tailed distribution of erosional hiatuses (that is, time periods where no or relatively slow erosion occurs). We argue that such a distribution can result from the intermittency of erosional processes in glaciated landscapes that are tightly coupled to climate variability from decadal to millennial time scales. In contrast, we find no evidence for a time scale bias in spatially averaged erosion rates of landscapes dominated by river incision. We discuss the implications of our findings in the context of the proposed coupling between climate and tectonics, and interpreting erosion rate estimates with different averaging time scales through geologic time.
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Stojsin, Ivana, Tatjana Brkanic, and Slavoljub Zivkovic. "Reflux disease as an etiological factor of dental erosion." Srpski arhiv za celokupno lekarstvo 138, no. 5-6 (2010): 292–96. http://dx.doi.org/10.2298/sarh1006292s.
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Introduction Gastroesophageal reflux is a frequent disease which has a significant influence on the development of dental erosions. Objective The aim of this research was to determine the frequency of dental erosions among the patients with gastroesophageal reflux, as well as to verify the most common symptoms of gastroesophageal disease. Methods The research comprised of two groups, each consisting of 30 patients aged 18-80 years. The experimental group comprised of patients diagnosed with gastroesophageal reflux disease (GERD), while the control group was composed of patients who were not diagnosed with GERD. Based on the illness history data, all patients of the experimental group were registered to have gastroesophageal and extraesophageal symptoms. Dental erosions were diagnosed during a stomatological inspection by using index system according to Eccles and Jenkins. Data processing was accomplished by the Statgraphics Centurion software package. Results Dental erosions were found in 76.7% of experimental group patients, and in 53.3% of control group patients. Fortynine percent of teeth of the experimental group patients and 31.1% of the control group patients showed erosive changes. On average, the number of teeth with erosions in the experimental group was 15.7 per person and in the control group 10 per person. The teeth of the front region of the upper jaw, as well as the lower first molars had the highest average value of dental erosion index. In the experimental group 12.8% of teeth and 24% of teeth in the control group were diagnosed to have dental erosion index value 1. Furthermore, 23.4% of teeth in the experimental group and 7.1% of teeth in the control group were registered to have dental erosion index value 2. Finally, the dental erosion index value 3 was found in 13.0% of teeth in the experimental group only. The highest average value of regional erosion index in the experimental group was found in the region 13-23 equalling 1.0. The same value in the control group equalled 0.6. In the experimental group the average value of dental erosion index for the upper jaw was 0.9, while this value for the lower jaw equalled 0.8. The analysis of the illness history data obtained showed that there was a statistically significant difference between the two observed groups in terms of burning pain (noncardiac in origin) around the heart area, bad breath and dentine hypersensitivity as the dominant symptom of dental erosion (p<0.05). Conclusion Dental erosions could be considered to be the extraesophageal manifestation of gastroesophageal reflux. .
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Diekhoff, Torsten, Juliane Greese, Joachim Sieper, Denis Poddubnyy, Bernd Hamm, and Kay-Geert A. Hermann. "Improved detection of erosions in the sacroiliac joints on MRI with volumetric interpolated breath-hold examination (VIBE): results from the SIMACT study." Annals of the Rheumatic Diseases 77, no. 11 (August 10, 2018): 1585–89. http://dx.doi.org/10.1136/annrheumdis-2018-213393.
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ObjectiveTo compare the performance of a new three-dimensional MRI sequence (volumetric interpolated breath-hold examination; MR-VIBE) with a conventional T1-weighted sequence (MR-T1) for the detection of erosions in the sacroiliac joints (SIJs) using low-dose CT (ldCT) as reference.MethodsldCT and T1-MRI and MR-VIBE of 110 prospectively included patients with low back pain and suspected axial spondyloarthritis (axSpA) were scored for erosions by two readers. The presence of erosions on the patients’ level, the erosion sum score, sensitivity and specificity of both MRI sequences using ldCT as a reference as well as agreement between the readers were assessed.ResultsMR-VIBE had a higher sensitivity than MR-T1 (95% vs 79%, respectively) without a decrease in specificity (93% each). MR-VIBE compared with MR-T1 identified 16% more patients with erosions (36 vs 30 of 38 patients with positive ldCT findings). The erosion sum score was also higher for MR-VIBE (8.1±9.3) than MR-T1 (6.7±8.4), p=0.003. The agreement on erosion detection was also higher for MR-VIBE (κ=0.71) compared with MRI-T1 (κ=0.56).ConclusionVIBE detected erosions in the SIJs with higher sensitivity without a loss of specificity and superior reliability compared with a standard T1-weighted sequence. Its value for the diagnosis of axSpA has still to be determined.
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Dunin-Borkowski Goluchowska, Katarzyna Maria, and Claudia Alejandra Delgado Tarazona. "¿Qué modificaciones deberían introducirse a la regulación que la Ley de Impuesto a la Renta peruana concede a la subcapitalización?" THEMIS Revista de Derecho, no. 76 (August 31, 2019): 201–12. http://dx.doi.org/10.18800/themis.201902.012.
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La erosión de la recaudación tributaria vía deducción de intereses es un fenómeno que en la actualidad interesa al Estado peruano. En tal contexto, la subcapitalización es una cláusula específica que permite limitar tal accionar. No obstante, no todo tipo de subcapitalización se encuentra proscrita por la legislación nacional, sino únicamente la que erosiona la base sobre la cual se calcula el impuesto a la renta.
En el presente artículo, las autoras abordan la r-gulación de la Ley del Impuesto a la Renta en el Perú sobre la base de la cláusula antielusiva específica de subcapitalización. Con tal perspectiva, abordan los enfoques recomendados por la Acción 4 del plan Base Erosion and Profit Shifting y, a su vez, desarrollan los seis enfoques recomendados por la Organización para la Cooperación y el Desarrollo Económico.
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More, Madhuri S., Rahul B. Patel, Jaymin A. Contractor, Alpa P. Pipaliya, Esha J. Desai, and Bhavik M. Patel. "A cross sectional study to assess the role of preoperative HRCT temporal bone in CSOM: a comparison between middle ear surgeries with and without pre-op HRCT." International Journal of Otorhinolaryngology and Head and Neck Surgery 5, no. 2 (February 23, 2019): 273. http://dx.doi.org/10.18203/issn.2454-5929.ijohns20190046.
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<p class="abstract"><strong>Background:</strong> Importance of HRCT before middle ear surgery is proved by many published articles but most of the studies were done without evaluating the accuracy of clinical judgment at the same time.</p><p class="abstract"><strong>Methods:</strong> All the patients of CSOM in whom the middle ear surgery was planned were included in the study. Total number of sample size was 80 patients. Group A: 20 patients in which HRCT temporal bone was indicated as a routine evaluation before middle ear surgeries. Group B: 60 patients in which HRCT temporal bone was not indicated. </p><p class="abstract"><strong>Results:</strong> Maximum 43.75% (35) patients belong to 21 to 30 yrs. F: M is 1.5:1. Unilateral ear disease is more common (62.5%). 41.8% had mucosal type while 16.25% had squamosal type of COM. 77.5% ears found to have hearing loss. Conductive hearing loss was the most common (43.13%). HRCT in comparison with Intra-op had Kapa value of 1 (Aditus blockage & Tegmen erosion), 0.6 (sinus plate erosions), 0.5 (malleus, Incus, stapes erosions), 0.48 (Ossicular chain status), 0.46 (Scutum erosion), 0.4 (LSC fistula) and 0.3 (fallopian canal erosions. Clinical judgment in comparison with intra-op had kapa value of 1 (stapes erosion), 0.96 (aditus blockage), 0.79 (Incus erosion), 0.78 (malleus erosion) and 0.76 (ossicular chain status).</p><p class="abstract"><strong>Conclusions:</strong> Clinical judgment is as good as or even better than CT in presuming/detecting at least individual ossicular erosions, ossicular chain status, aditus blockage and HRCT temporal bone should be reserved for high risk and complicated cases.</p>
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Penmetsa, G., S. Pei, B. Sauer, J. A. Walsh, B. Feng, J. Walker, K. Douglas, and J. Clewell. "POS0262 IDENTIFYING EROSIVE DISEASE FROM RADIOLOGY REPORTS OF VETERANS WITH INFLAMMATORY ARTHRITIS USING NATURAL LANGUAGE PROCESSING." Annals of the Rheumatic Diseases 80, Suppl 1 (May 19, 2021): 353.2–354. http://dx.doi.org/10.1136/annrheumdis-2021-eular.1794.
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Background:The presence of erosive disease influences diagnosis, management, and prognosis in inflammatory arthritis (IA).Research of IA in large datasets is limited by a lack of methods for identifying erosions.Objectives:To develop methods for identifying articular erosions in radiology reports from veterans with IA.Methods:Included veterans had ≥2 ICD codes for ankylosing spondylitis (AS), psoriatic arthritis (PsA), or rheumatoid arthritis (RA) between 2005- 2019, in Veterans Affairs Corporate Data Warehouse. Chart review & annotation of radiology notes produced the reference standard, & identified erosion terms that informed classification rule development. A rule-based natural language processing (NLP) model was created & revised in training snippets. The NLP method was validated in an independent reference sample of IA patients at the snippet & patient levelsStepDescriptionNumber & example1 Radiology notesa.Select note titles potentially relevant to IAa. 35,141 notes titlesb.Extract notes with titles potentially related to IAb. 2,926,113 radiology notes2 Possible meaningful termsa.Compile list of root terms that may indicate erosiona. 11 root terms (i.e. ero*, pencil*cup, irreg*)b.Query radiology notes for root term variationsb. 1178 variations (i.e. erosion, erotic, erode)c.Select possible meaningful termsc. 179 possible terms (i.e. erosion, erode)3 Annotationa.Extract snippets^ containing possible meaningful termsa.5000 snippets from radiology notesb.Classify snippets according to: 1) Meaningful term, 2) Relevance to joint, 3) Attribution to IA, 4) Affirmationb.4068 classifications with 1017 snippets (in rounds of 50-417 snippets for NLP training & testing)4 Rule developmenta.Identify meaningful terms representing erosiona. 6 terms (pencil * cup, erosion, erosive, etc.)b.Exclude erosive processes irrelevant to joint(s)b. 28 irrelevant processes (i.e. gastric erosion)c. Exclude articular erosive processes not attributed to IAc. 5 non-IA processes IA (i.e. infection)d. Classify as affirmed/negated (erosion present/absent)d. 83 affirmation/negation rules5 NLP trainingDesign & revise NLP model until accuracy ≥90%6 rounds, 817 snippets (AS 417, RA 200, PsA 200)6 NLP testingTest NLP model200 snippets (AS 100, RA 50, PsA 50)7 Pt classificationa. Develop rules for classifying pts with discordant snippetsa. 5 rules developed in 368 ptsb. Build reference sample (pts classified as erosive or non-erosive via chart review)b. 30 IA pts (10 AS, 10 RA, 10 PsA)8 NLP validationValidate NLP model in reference sample at snippet level149 snippets (29 AS, 76 RA, 44 PsA)9 Method validationValidate methods (NLP+pt classification) at pt level30 IA pts (reference sample)pt= patient. ^Snippets include text containing 30 words before & after meaningful termsResults:In 168,667 veterans with IA, the mean age was 63.1 & 90.3% were male. Method development involved radiology note & erosion term selection, rule development, NLP model building, & method validation. The NLP model accuracy was 94.6% at the snippet level & 90.0% at the patient level, for all IA patients.Accuracy of methods.Conclusion:The methods accurately identify erosions from radiology reports of veterans with IA. They may facilitate a broad range of research involving cohort identification & disease severity stratificationReferences:[1]Walsh JA, et al. J Rheumatol. 2020;47(1):42-49Disclosure of Interests:Gopi Penmetsa: None declared, Shaobo Pei: None declared, Brian Sauer Grant/research support from: I have been an investigator on research contracts supported by Abbvie., Jessica A. Walsh Consultant of: AbbVie, Amgen, Janssen, Lilly, Novartis, Pfizer, UCB, Grant/research support from: AbbVie, Merck, Pfizer, Bingjian Feng Grant/research support from: Bing-Jian Feng reports funding and sponsorship to his institution on his behalf from Pfizer Inc., Regeneron Genetics Center LLC, and Astra Zeneca (UK). The PERCH software, for which Bing-Jian Feng is the inventor, has been non-exclusively licensed to Ambry Genetics for clinical genetic testing services and research., Jodi Walker Shareholder of: Abbvie and mutual funds containing various pharmaceutical companies, Employee of: Abbvie, Kevin Douglas Shareholder of: employed by Abbvie, Employee of: employed by Abbvie, Jerry Clewell Shareholder of: Own Abbvie Shares and mutual funds that hold pharmaceutical and other health care stocks, Employee of: I am current Abbvie Inc employee and past employee of Eli Lilly co
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Yasmine, M., H. Ferjani, D. Kaffel, K. Maatallah, S. Rahmouni, and W. Hamdi. "AB0124 STRUCTURAL DAMAGE IN THE FOOT IN RHEUMATOID ARTHRITIS: DON’T MISS THE OTHER METATARSOPHALANGEAL JOINTS." Annals of the Rheumatic Diseases 80, Suppl 1 (May 19, 2021): 1091.1–1091. http://dx.doi.org/10.1136/annrheumdis-2021-eular.2227.
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Background:The foot involvement in rheumatoid arthritis (RA) affects the functionality and the quality of life in patients. Despite this, the clinicians do not give enough care to the foot in RA patients, especially if asymptomatic, resulting in joint damage, deformity, and disability. The distribution of erosions of the other MTP joints (excluding the 5th) has not previously been studied.Objectives:This study aimed to investigate the distribution of erosions in MTP joints and their clinical implications.Methods:We conducted a retrospective study including patients with RA according to the American college of rheumatology/ the European league against rheumatism classification criteria. Sociodemographic data, as well as disease activity related characteristics, were recorded.Posterior–anterior radiographs of the hands and feet of each patient were assessed for erosions.All patients were assessed by Ultrasonography (US) of the hands. US erosions were scored 0-3 according to Szkudlarek [1]. We divided patients into two groups (G1 without MTPs erosions and G2 with MTPs erosions).Results:We enrolled forty-two females and eleven males in our studies. The mean age was 58.6 years ±12.7 [23-77], and the mean disease duration was 8.4 years [1-47]. Rheumatoid factor or cyclic citrullinated peptide antibodies (Anti-CCP) were positive in 62.3% of cases. The mean DAS28ESR score was 5.1±1.16 [2.5-7.7]. Half of the patients had the active disease (52.8%). Hand erosions evaluated with plain radiographs and the US were found in 43.1% and 50.9% of cases, respectively. The distribution of foot erosions (15.1%) was at follows: 5th right MTP (7.5%), the 5th right IPP (2%), the 1st left MTP (2%), 3th left MTP (3.8%), 4th left MTP (5.7%) and the 5th left MTP (9.4%). Erosions on MTPs with the exclusion of the 5th MTP were present in 9.4% of cases. The presence of MTPs erosion was more frequent in males (p=0.01) but was not associated with age (p=0.6) or disease duration (p=0.2). Seropositivity was similar between the two groups (p=0.06). Similarly, the inflammatory markers (ESR and CRP), as well as DAS28 ESR, did not differ between the two groups (p>0.05). MTPs erosion was not associated with the presence of hand erosions on a plain radiograph (p=0.445). However, MTPs erosion was significantly more frequent in patients with less erosive hands-on US (p=0.034).Conclusion:Our study showed that screening of other MTPs (excluding the 5th) is mandatory in RA diagnosis. Interestingly, in our result, MTPs erosion is more frequent in males with less erosive hands.Disclosure of Interests:None declared
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Gong, Feng Wen, and Li Yuan. "Study on the Soil Erosion Dynamic Changes in Songhuajiang River Watershed Based on RS and GIS." Advanced Materials Research 347-353 (October 2011): 1268–71. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.1268.
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Based on the RS and GIS, the main data resource of Landsat TM image (1995 and 2005a) was used to study the soil erosion’s spatial-temporal dynamic changes. The results shown that: the reduced area of micro-level and slight soil erosion was 190.8 and 640 km2; the increased area of moderate and intensity soil erosion was 168 and 663 km2, the preserving ratio of micro-level erosion was greatest, intensity soil erosion’s persevering ratio was smallest, the transfer-out probability from intensity to micro-level soil erosion was greatest, the study results could give us some advice on making rational use of land and improving land use pattern the optimal allocation during developing the local economy.
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Ivlieva, Olga V., Lyudmila A. Bespalova, Vadim V. Glinka, Larisa V. Serdyuk, and Alexander A. Chmykhov. "The Use of Unmanned Aerial Vehicles to Assess the Intensity of Manifestation of Dangerous Coastal Processes in the Water Protection Zone of the Tsimlyansk Reservoir." UNIVERSITY NEWS. NORTH-CAUCASIAN REGION. NATURAL SCIENCES SERIES, no. 2 (210) (June 28, 2021): 56–65. http://dx.doi.org/10.18522/1026-2237-2021-2-56-65.
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The water protection zone of the Tsimlyansk reservoir was chosen as the object of research. The subject of the study was the assessment of the intensity of manifestation of dangerous coastal processes of the reservoir: abrasion-latency, erosion activity. A method for monitoring erosion processes in water protection zones of water bodies using a software and hardware complex based on unmanned aerial vehicles and GIS technologies has been developed and tested. The optimal type of digital elevation models has been determined for assessing the density of the erosion net-work, determining the types of banks and the intensity of manifestation of abrasion and landslide processes, measuring the morphometric characteristics of erosional landforms. The types of erosional landforms were determined and the zoning of the territory of the water protection zone of the Tsimlyansk reservoir was carried out according to the density of the erosional dissection of the relief. Studies have shown that the predominant erosional forms of the relief of the water protection zone of the Tsimlyansk reservoir are ravines and gullies. The maximum average value of the density of the erosional network of the relief within the boundaries of the administrative districts of the reservoir coast falls on the Surovikinsky district. In the Kalachevsky district, the maximum value of the density of the erosion network is noted within the water protection zone of the Tsimlyansk reservoir.
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Al-Yassir, Farah, Ghalia Khoder, Subi Sugathan, Prashanth Saseedharan, Asma Al Menhali, and Sherif M. Karam. "Modulation of Stem Cell Progeny by Probiotics during Regeneration of Gastric Mucosal Erosions." Biology 10, no. 7 (June 28, 2021): 596. http://dx.doi.org/10.3390/biology10070596.
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Patients with gastric mucosal erosions are predisposed to chronic gastritis, ulcer or even cancer. The repair of mucosal erosions involves several events including proliferation of gastric epithelial stem cells. The aim of this study was to investigate the effects of the probiotic mixture of De Simone Formulation on gastric epithelial stem cell lineages in mouse models of gastric mucosal erosions. Gastric erosions were induced by a single oral gavage of 80% ethanol containing 15 mg/mL acetylsalicylic acid (5 mL/kg) following a daily dose of probiotic mixture (5 mg/day/mouse) for 10 days. In another protocol, erosions were induced by a daily gavage of acetylsalicylic acid (400 mg/kg/day/mouse) for 5 days before or after daily administration of probiotic mixture for 5 days. Control mice received water gavage for 10 days. All mice were injected with bromodeoxyuridine two hours before sacrifice to label S-phase cells. The stomachs of all mice were processed for histological examination, lectin binding, and immunohistochemical analysis. The results reveal that mice that received probiotics before or after the induction of erosion showed a decrease in erosion index with an increase in gastric epithelial stem/progenitor cell proliferation and enhanced production of mucus, trefoil factors, and ghrelin by mucous and enteroendocrine cell lineages. These mice also showed restoration of the amount of H+,K+-ATPase and pepsinogen involved in the production of the harsh acidic environment by parietal and chief cell lineages. In conclusion, this study demonstrates the beneficial effects of probiotics against gastric mucosal erosion and highlights the involvement and modulation of proliferative stem cells and their multiple glandular epithelial cell lineages.
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Seutloali, Khoboso Elizabeth, and Heinrich Reinhard Beckedahl. "A Review Of Road‒Related Soil Erosion: An Assessment Of Causes, Evaluation Techniques And Available Control Measures." Earth Sciences Research Journal 19, no. 1 (June 30, 2015): 73–80. http://dx.doi.org/10.15446/esrj.v19n1.43841.
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<p>Road construction has increased significantly worldwide in the last decades to meet the demands of the increasing human population and this has led to serious soil erosion problems, the bulk of which is unaccounted for, especially in the developing world. For comprehensive land management decisions and monitoring strategies, a review of work that has been done to assess soil erosion due to roads is critical. This article, therefore, reviews the causes of road‒related soil erosion, assessment methods and available control measures. Specifically, work provides an overview of (i) the linkages between roads and soil erosion; (ii) measurement and prediction of road‒related erosion; and (iii) erosion control and rehabilitation techniques. Literature shows that road construction results in hill-slope profile modification; removal of vegetation cover; as well as the formation of steep slopes that are prone to severe erosion. Furthermore, there is a variety of erosion control measures for controlling road‒related erosion although no study has demonstrated the method that is cost efficient and operational across different landscapes. We are of the view that this study provides guidance in future research on road‒related soil erosion across the developing world were sophisticated monitoring techniques are limited due to resource scarcity for assessing large areas.</p><p> </p><p><strong>Resumen</strong></p>La construcción de carreteras se ha incrementado ampliamente en todo el mundo durante las últimas décadas para cumplir con las demandas de la creciente población humana, lo que ha llevado a serios problemas de erosión de suelos, muchos de los cuales no se previeron, especialmente, en los países en desarrollo. Sobre las decisiones y supervisión de estrategias de un manejo completo del terreno se realizó una revisión al crítico trabajo que se ha hecho para medir la erosión en suelos causados por las carreteras. Por esta razón, este artículo revisa las causas de la erosion relacionada con la construcción de rutas y evalúa los métodos y medidas de control disponibles. Específicamente, este trabajo ofrece una revisión de (a) las relaciones entre las carreteras y la erosión de los suelos; (b) la medida y la predicción de la erosión vinculada a las carreteras, y (c) las técnicas de control de erosión y rehabilitación. La literature muestra que la construcción de carreteras produce modificaciones en el perfil inclinación, remueve la vegetación superficial y aumenta la inclinación en pendientes propensas a erosión severa. Además, existen varias medidas para controlar la erosión causada por la construcción de carreteras, a pesar de que ningún estudio ha demostrado el método que sea más eficiente y operacional para diferentes paisajes. Este estudio guía futuras investigaciones en la erosion causada por la construcción de caminos en los países en desarrollo donde las técnicas de supervisión sofísticas para la evaluación de grandes áreas son limitadas debido a la escasez de recursos.
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Tamrin, Izza Nadrata. "THE ANALYSIS LANDSLIDES POTENTIAL DUE TO CHANGES OF LAND-USE IN MIU WATERSHED." Jurnal Sains dan Teknologi Tadulako 8, no. 1 (April 30, 2022): 16–28. http://dx.doi.org/10.22487/jstt.v8i1.374.
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This study aims to determine the magnitude of land-use change in the Miu watershed and to determine the relation between slope and soil type to erosions. The method used to predict the rate of erosion is the Universal Soil Loss Equation (USLE) in 2005, 2010, and 2016 with the help of the Geographic Information System (GIS). This study uses data on rainfall, slope, soil type, land use, and conservation and crop management factors which are then entered into the USLE equation. From this equation, the actual erosion rate in 2005 was 2,634,104.25 tons / year, 2010 was 3,285,025.34 tons / year, and 2016 was 1,856,140.79 tons / year. The average actual erosion in 2005, 2010, and 2016 was 2,591,756.79 tons/year, which is classified as minor erosion. The landslide-prone area based on the lowest slope of 5.50% is equivalent to an area of 36 km2, for the medium it is 34.81% equivalent to an area of 228 km2, and a height of 59.69% covering an area of 391 km2 where very steep slopes dominate this river basin. The effect of significant land-use change affects the rate of erosion when there is a high intensity of rain on a steep slope so the potential for erosions in the area.
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Perl, M., C. Levy, and J. Bu. "Three-Dimensional Analysis of a Semi-Elliptical Crack Emanating From an Erosion at the Bore of an Autofrettaged Pressurized Cylinder." Journal of Pressure Vessel Technology 121, no. 2 (May 1, 1999): 209–15. http://dx.doi.org/10.1115/1.2883688.
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The effect of various erosion configurations on the mode I stress intensity factor (SIF) distribution along the front of a semi-elliptical crack, emanating from the deepest line of the erosion surface (DLES) at the bore of an autofrettaged, pressurized thick-walled cylinder of outer to inner radius ratio, Ro/Ri = 2, is investigated. The three-dimensional (3-D) linear elastic problem is solved via the finite element (FE) method using the ANSYS 5.2 standard code. Hill’s autofrettage residual stress field is simulated by an equivalent thermal load and the SIFs are determined by the nodal displacement method. SIF distribution along the front of semi-elliptical cracks of various crack depths to wall thickness ratios, a/t = 0.05 to 0.25, and ellipticities, a/c, ranging from 0.5 to 1.5, emanating from the DLES, are determined. Three groups of erosion geometries are considered: (a) arc erosions of constant relative depth, d/t, equal to 5 percent and with relative radii of curvature, r′/t, between 5 and 30 percent; (b) semi-elliptic erosions of constant relative depth, d/t, of 5 percent with erosion ellipticity, d/h, varying from 0.3 to 2.0; and (c) semi-circular erosions of relative depth, d/t, between 1 and 10 percent of the wall thickness. The effective SIF along the crack front results from the superposition of KIP—the SIF due to pressurization, and KIA—the negative SIF due to the autofrettage residual stress field. KIP is highly dependent on the stress concentration ahead of the DLES which directly relates to the erosion geometry. The absolute value of KIA is just slightly reduced by the presence of the erosion. Its change solely depends on, and is directly proportional to, the erosion depth. Thus, while deep cracks are almost unaffected by the erosion, the effective SIF for relatively short cracks is found to be significantly enhanced by its presence and might result in a shortening of the vessel’s fatigue life by up to an order of magnitude. Also, it is shown that 2-D analysis may lead to a nonconservative estimate of the vessel’s fatigue life.
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Mandl, P., I. Gessl, G. Filippou, S. Sirotti, L. Terslev, C. Pineda, H. Keen, et al. "OP0291 SCORING STRUCTURAL DAMAGE IN RHEUMATOID ARTHRITIS BY ULTRASOUND: RESULTS FROM A DELPHI PROCESS AND WEB-RELIABILITY EXERCISE BY THE OMERACT US WORKING GROUP." Annals of the Rheumatic Diseases 81, Suppl 1 (May 23, 2022): 193–94. http://dx.doi.org/10.1136/annrheumdis-2022-eular.3359.
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BackgroundStructural damage in rheumatoid arthritis (RA) includes bone erosion, cartilage change, and joint malalignment; historically evaluated with conventional radiography. Ultrasound (US) has been shown to be a valid tool for evaluating both cartilage change and bone erosion.ObjectivesTo obtain agreement on definitions and develop semiquantitative scoring systems for assessing structural damage by US and to validate these in a web-based reliability exercise.MethodsA Delphi survey of statements was prepared by an OMERACT US Working Group task force (USWG) based on a previously published systematic literature review (1) and circulated between group members, including definitions on normal US appearance of joint components, definitions of elementary lesions and scoring systems for bone erosions and joint malalignment. Definitions and a US scoring system for scoring cartilage change were recently developed and validated by the USWG (2) After agreement was achieved (≥75% of grades 4-5 on 1-5 Likert scale) on the statements, still images of metacarpophalangeal and proximal interphalangeal joints 2-5 in healthy controls and in RA patients with varying degrees of pathology were acquired by the USWG members. A dataset of 100 anonymized images, representing various grades of the 3 components of structural damage was created and utilized in 2 rounds of a web-based exercise. Intra- and inter-reader reliability of the scoring systems was assessed by kappa statistics.Results19 USWG members needed 4 Delphi rounds to reach agreement on a total of 9 statements. 4/12 statements were approved in the first, 2/6 in the second, 1/5 in the third and 2/2 in the fourth round. Final scoring systems and representative images are shown in Table 1 & Figure 1. 22 members participated in the web-based reliability exercise. The intra-reader reliability was almost perfect for bone erosion (kappa: 0.87) and cartilage change (kappa: 0.83) and substantial for malalignment (kappa of 0.72). The inter-reader reliability was almost perfect for bone erosion (kappa: 0.85), and substantial for cartilage change (kappa: 0.79) and malalignment (0.62).Table 1.Final definitions of scoring systems of elementary lesions of structural damage in rheumatoid arthritisAgreementBone erosionA 4-grade semiquantitative scoring system can be used to score erosions as follows: grade 0. intact cortical bone; grade 1. single small erosion (diameter: ≤2mm); grade 2. single large erosion (diameter: >2mm) or 2 small erosions; grade 3. 2 large erosions or ≥3 erosions, regardless of size. Both longitudinal and transverse scans should be considered, and the largest measure chosen for each erosion.100%Cartilage changeA 3-grade semiquantitative scoring system can be used to grade hyaline cartilage change as follows: grade 0. normal cartilage; grade 1. minimal change: focal thinning or incomplete loss of cartilage; grade 2. severe change: diffuse thinning or complete loss of cartilage.80% (2)MalalignmentA 3-grade semiquantitative scoring system can be used to grade malalignment as follows: 0. normal alignment; 1. subluxation or partial dislocation, where the two bone endings are malaligned so that one bone ending is dislocated from its normal position, but still within the articulation; 2. luxation or total dislocation, where the luxated bone ending moves beyond the articulation and the opposing bone ending. Bone position may be compared with a contralateral or similar intact joint if available.94%Figure 1.Representative images of the scoring systems for bone erosion (A), cartilage change (B) and malalignment (C)ConclusionThis first attempt to create a composite US instrument based on scoring systems encompassing all aspects of structural damage, demonstrates that US is a reliable tool for evaluating and scoring bone erosion, cartilage change and malalignment in the finger joints of RA patients.References[1]Gessl I, et al. Semin Arthritis Rheum. 2021 Jun;51(3):627-39.[2]Mandl P, et al. Rheumatology (Oxford). 2019 Oct 1;58(10):1802-11.Disclosure of InterestsPeter Mandl Speakers bureau: AbbVie, Janssen, Lilly, Novartis, Consultant of: AbbVie, Janssen, Lilly, Novartis, Grant/research support from: AbbVie, BMS, Novartis, Janssen, Lilly, MSD, UCB, Irina Gessl: None declared, Georgios Filippou: None declared, Silvia Sirotti: None declared, Lene Terslev Speakers bureau: Novartis, Pfizer, UCB, Janssen, GE, Carlos Pineda: None declared, Helen Keen Speakers bureau: Roche, AbbVie, Janssen, Consultant of: Sanofi, Marina Backhaus: None declared, David Andrew Bong: None declared, Edoardo Cipolletta: None declared, PAZ COLLADO: None declared, Christian Dejaco Speakers bureau: Roche, AbbVie, Sanofi, Lilly, Pfizer, Novartis, Janssen, Galapagos, Consultant of: Roche, AbbVie, Sanofi, Lilly, Pfizer, Novartis, Janssen, Galapagos, Andrea Delle Sedie Speakers bureau: Abbvie, Amgen, Lilly, MSD, Novartis, UCB, Paid instructor for: Abbvie, Amgen, Lilly, MSD, Novartis, UCB, Consultant of: Abbvie, Amgen, Lilly, MSD, Novartis, UCB, Christina Duftner: None declared, Hilde Berner Hammer: None declared, Annamaria Iagnocco: None declared, Zunaid Karim: None declared, Ingrid Möller Speakers bureau: Bristol-Myers Squibb, Ibsa, Pfizer, Galapagos, Esperanza Naredo Speakers bureau: Abbvie, Pfizer, Lilly, Novartis, Janssen, Celgene GmbH, Paid instructor for: Novartis, Consultant of: Novartis, Lilly, Grant/research support from: Lilly, Pfizer, Wolfgang A. Schmidt: None declared, Marcin Szkudlarek: None declared, Giorgio Tamborrini: None declared, Priscilla C Wong: None declared, Emilio Filippucci Speakers bureau: AbbVie, Amgen, Bristol -Myers Squibb, Janssen-Cilag, Lilly, Novartis, Pfizer, Roche, Union Chimique Belge Pharma, Peter Balint Speakers bureau: Abbvie, Janssen, Lilly, Novartis, Maria-Antonietta D’Agostino: None declared
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Davis, Derik L., and Michael E. Mulligan. "Osteochondroma-Related Pressure Erosions in Bony Rings Below the Waist." Open Orthopaedics Journal 9, no. 1 (November 4, 2015): 520–24. http://dx.doi.org/10.2174/1874325001509010520.
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This article investigates the clinical and radiological features of four cases of osteochondroma-related bony pressure erosion in adults. Rare imaging features of extrinsic pressure erosions on adjacent bones caused by solitary and familial forms of osteochondroma are presented. Although described to occur uncommonly in the paired bones of the lower leg, pressure erosion in the pelvic girdle is poorly understood. In this article, we discuss clinical contexts for management of osteochondroma-related bony pressure erosion in the mature skeleton.
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Boštík, Jiří, Lumír Miča, Ivailo Terzijski, Mirnela Džaferagić, and Augustin Leiter. "Grouting below Subterranean Water: Erosional Stability Test." Materials 14, no. 9 (April 30, 2021): 2333. http://dx.doi.org/10.3390/ma14092333.
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The article is focused on the medium-term negative effect of groundwater on the underground grout elements. This is the physical–mechanical effect of groundwater, which is known as erosion. We conduct a laboratory verification of the erosional resistance of grout mixtures. A new test apparatus was designed and developed, since there is no standardized method for testing at present. An erosion stability test of grout mixtures and the technical solutions of the apparatus for the test’s implementation are described. This apparatus was subsequently used for the experimental evaluation of the erosional stability of silicate grout mixtures. Grout mixtures with activated and non-activated bentonite are tested. The stabilizing effect of cellulose relative to erosion stability has been also investigated. The specimens of grout mixtures are exposed to flowing water stress for a certain period of time. The erosional stabilities of the grout mixtures are assessed on the basis of weight loss (WL) as a percentage of initial specimen weight. The lower the grout mixture weight loss, the higher its erosional stability and vice versa.
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Hidayat, Yayat, Naik Sinukaban, Hidayat Pawitan, and Suria Darma Tarigan. "Impact of Rainforest Conversion on Surface Runoff and Soil Erosion in Nopu Upper Catchment of Central Sulawesi." Journal of Tropical Soils 13, no. 1 (January 1, 2008): 59–65. http://dx.doi.org/10.5400/jts.2008.v13i1.59-65.
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Rainforest conversion into agricultural lands in Nopu Upper Catchment such as cocoa plantations, maizes, cassava, peanuts, and scrub and bush were significantly increase soil erosions and surface runoffs, which in turn will decrease crops productivity and hydrologic functions of watershed. Soil erosion from maize and peanut rotation plots are higher 2.061,8% than soil erosions from natural forest plots. Soil erosions are higher also in intercroping young age cocoa, maize and cassava plots and maize plots respectively 2.023,8% and 2.012,3%. Where as surface runoffs were increase up to 650,9% in medium age cocoa plots, 380,4% in intercroping young age cacao and cassava plots, and 347,1% in scrub and bush plots. The result of ANSWERS model simulation using daily C factors were indicate that rainforest conversion into agricultural lands in Nopu Upper Catchment causing soil and water loss respectively 3.190,5 ton/year and 115.441 m3/year. Application of agroforestry systems in agricultural lands which in line with reforestation in stream line area of Nopu river and steepy agricultural lands (slope > 40%) are effectively reduce soil erosions up to 77,6% compare to soil erosion from existing land uses.
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ØSTERGAARD, MIKKEL, UFFE MØLLER DØHN, ANNE DUER-JENSEN, MERETE LUND HETLAND, KIM HØRSLEV-PETERSEN, KRISTIAN STENGAARD-PEDERSEN, PETER JUNKER, JAN PØDENPHANT, and BO EJBJERG. "Patterns of Magnetic Resonance Imaging Bone Erosion in Rheumatoid Arthritis — Which Bones Are Most Frequently Involved and Show the Most Change?: Figure 1." Journal of Rheumatology 38, no. 9 (September 2011): 2014–17. http://dx.doi.org/10.3899/jrheum.110416.
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Objective.To investigate by magnetic resonance imaging (MRI) which bones in wrists and metacarpophalangeal (MCP) joints most frequently show bone erosions, and which most frequently demonstrate erosive progression, in early and established rheumatoid arthritis (RA).Methods.MRI datasets from 258 RA patients [126 with early RA (disease duration < 6 months)] were analyzed, of whom 223, including 126 with early RA, had 1-year followup MRI. All patients had MRI of one wrist, whereas 86 patients had additional images of 2nd–5th MCP joints, and 46 patients additional images of the contralateral wrist. MRI were evaluated blinded by one reader, according to the OMERACT RA MRI scoring system (RAMRIS) for erosions, and presence/absence of erosions was noted in each bone, as was presence/absence of erosive progression.Results.The capitate, ulna, lunate, triquetrum, and scaphoid were the 5 bones with both most frequent baseline erosions and most frequently demonstrated erosive progression. No bones were without erosions. Patterns of erosions and progression were similar in early and established RA. No major difference between dominant and nondominant wrists was detected. In the fingers, the 2nd–3rd MCP joint most frequently displayed erosions and erosive progression.Conclusion.The distribution and frequency of bone erosion and erosive progression as detected by MRI in RA wrists and MCP joints were identified. No pattern differences between early versus established disease and dominant versus nondominant sides were detected. No bones showed erosive progression. Thus, no self-evident simplification of the RAMRIS erosion score was identified. Bone involvement patterns may be considered, when joints are selected for MRI protocols for clinical trials and practice.
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Oliveira, José Guilherme de, Alexei Nowatzki, and Leonardo José Cordeiro Santos. "UTILIZAÇÃO DE ATRIBUTOS TOPOGRÁFICOS NO MAPEAMENTO DE SUSCETIBILIDADE EROSIVA NA ÁREA RURAL DO MUNICÍPIO DE PARANAVAÍ – PR." Revista Cerrados 15, no. 02 (March 16, 2020): 201–19. http://dx.doi.org/10.22238/rc24482692v15n22017p201a219.
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A região noroeste do estado do Paraná ao longo dos últimos 50 anos vem sofrendo diversos impactos decorrentes de processos erosivos lineares, ravinas e voçorocas principalmente. A ocorrência desses processos está associada a dois fatores: o histórico de ocupação da região, bem como as características pedológicas locais, principalmente a textura dos solos e sua distribuição nas vertentes. O método adotado para o mapeamento de suscetibilidade é uma adaptação do proposto por Crepani et al. (2001). Esse autor define que a suscetibilidade de uma área é definida pela soma das vulnerabilidades dos componentes do meio físico. Para a realização do trabalho foram selecionados os atributos topográficos declividade e perfil de curvatura; na pedologia, as tipologias de solo. Os resultados foram discretizados em 5 classes: Muito baixa, baixa, média, alta e muito alta suscetibilidade. As áreas de suscetibilidade a erosão Alta e Muito alta, representam 24% do município, sendo que nessas porções se concentram 26% das erosões, o tipo de solo em conjunto com as características topográficas fazem essa área mais propicia naturalmente a ocorrência dos processos erosivos. A classe de moderada suscetibilidade a erosão representam cerca de 40% do município e 54% das feições erosivas se concentra nessa unidade.
Palavras-chave: Erosão; Modelo Digital de Terreno; Álgebra de Mapas.
USE OF TOPOGRAPHIC ATTRIBUTES IN THE EROSIVE SUSCEPTIBILITY MAPPING IN THE RURAL AREA OF THE MUNICIPALITY OF PARANAVAÍ – PR
Abstract
The northwest region of the state of Paraná over the last 50 years has suffered several impacts and consequences of linear erosives, ravines and gullies mainly. The occurrence of these processes is mainly associated with two factors: the occupation history of the region, as well as local soil characteristics, mainly the soil texture and a distribution of soils along the slopes. The methodology adopted for the mapping of susceptibility to erosion follows a line of thought developed by Crepani et al. (2001). This proposal defines that the vulnerability of an area is defined by the sum of the vulnerabilities of the components of the physical environment. For the accomplishment of the methodology were selected, to represent the geomorphology, the topographic attributes: slope, curvature plane and profile; for pedology, soil typologies were selected. The results were discretized in 5 classes, from environments less susceptible to the most susceptible. The areas of susceptibility to erosion High and Very high, summed represent 24% of the municipality, being that in these portions it concentrates 26% of the area of the erosions, once in these areas the type of soil together with the topographic characteristics make it more propitious to the occurrence of linear erosive processes.The moderate susceptibility to erosion class represent about 40% of the municipality and 54% of the area of erosive features is concentrated in this unit.
Keywords: Erosions; Digital Terrain Model; Map Algebra.
UTILIZACIÓN DE ATRIBUTOS TOPOGRÁFICOS EN EL MAPEO DE SUSCEPTIBILIDAD EROSIVA EN EL ÁREA RURAL DEL MUNICIPIO DE PARANAVAÍ – PR
Resumen
La región noroeste del estado de Paraná en los últimos 50 años viene sufriendo impactos producto de procesos erosivos lineales, regueros y cárcavas principalmente. La ocurrencia de estos procesos está asociada a dos factores: el modo de ocupación de la región y las características pedológicas locales, principalmente la textura de los suelos y su distribución en las vertientes. El método adoptado para el mapeo de susceptibilidad es una adaptación del propuesto por Crepani et al. (2001). Este autor especifica que la susceptibilidad de un área está definida por la suma de las vulnerabilidades de los componentes del medio físico. Para realizar este trabajo fueron seleccionados los atributos topográficos declividad y perfil de curvatura; en la pedología, las tipologías de suelo. Los resultados fueron representados en 5 clases: muy baja, baja, media, alta y muy alta susceptibilidad. Las áreas de susceptibilidad a erosión alta y muy alta, representan el 24% del municipio, sumado a ello en esas porciones se concentran el 26% de las erosiones, por lo tanto el tipo de suelo en conjunto con las características topográficas hacen de esas áreas las más propicias naturalmente a la ocurrencia de procesos erosivos. La clase de moderada susceptibilidad a erosión representa cerca del 40% del municipio y el 54% de los rasgos erosivos se concentran en esa unidad.
Palabras claves: Erosión; Modelo Digital del Terreno; Álgebra del Mapas.
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Jaumann, Ralf, Robert H. Brown, Katrin Stephan, Jason W. Barnes, Larry A. Soderblom, Christophe Sotin, Stephané Le Mouélic, et al. "Fluvial erosion and post-erosional processes on Titan." Icarus 197, no. 2 (October 2008): 526–38. http://dx.doi.org/10.1016/j.icarus.2008.06.002.
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Shaw, John. "Hairpin erosional marks, horseshoe vortices and subglacial erosion." Sedimentary Geology 91, no. 1-4 (June 1994): 269–83. http://dx.doi.org/10.1016/0037-0738(94)90134-1.
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Kong, Bo, and Huan Yu. "Estimation Model of Soil Freeze-Thaw Erosion in Silingco Watershed Wetland of Northern Tibet." Scientific World Journal 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/636521.
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The freeze-thaw (FT) erosion is a type of soil erosion like water erosion and wind erosion. Limited by many factors, the grading evaluation of soil FT erosion quantities is not well studied. Based on the comprehensive analysis of the evaluation indices of soil FT erosion, we for the first time utilized the sensitivity of microwave remote sensing technology to soil moisture for identification of FT state. We established an estimation model suitable to evaluate the soil FT erosion quantity in Silingco watershed wetland of Northern Tibet using weighted summation method of six impact factors including the annual FT cycle days, average diurnal FT phase-changed water content, average annual precipitation, slope, aspect, and vegetation coverage. Finally, with the support of GIS, we classified soil FT erosion quantity in Silingco watershed wetland. The results showed that soil FT erosion are distributed in broad areas of Silingco watershed wetland. Different soil FT erosions with different intensities have evidently different spatial and geographical distributions.
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Németh, Károly. "Calculation of long-term erosion in Central Otago, New Zealand, based on erosional remnants of maar/tuff rings." Zeitschrift für Geomorphologie 47, no. 1 (March 19, 2003): 29–49. http://dx.doi.org/10.1127/zfg/47/2003/29.
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Fernandes, Anjali M., James Buttles, and David Mohrig. "Flow substrate interactions in aggrading and degrading submarine channels." Journal of Sedimentary Research 90, no. 6 (June 5, 2020): 573–83. http://dx.doi.org/10.2110/jsr.2020.31.
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ABSTRACT Connecting real-time measurements of current–bed interactions to the temporal evolution of submarine channels can be extremely challenging in natural settings. We present a suite of physical experiments that offer insight into the spectrum of interactions between turbidity currents and their channels, from i) detachment-limited erosion to ii) transport-limited erosion to iii) pure deposition. In all three cases channel sinuosity influenced patterns of erosion and deposition; the outsides of bends displayed the highest erosion rates in the first two cases but showed the highest deposition rates in the third. We connect the evolution of these channels to the turbulence of the near-bed boundary layer. In the erosional experiments the beds of both channels roughened through time, developing erosional bedforms or trains of ripples. Reynolds estimates of boundary-layer roughness indicate that, in both erosional cases, the near-bed boundary layer roughened from smooth or transitionally rough to rough, whereas the depositional channel appears to have remained consistently smooth. Our results suggest that, in the absence of any changes from upstream, erosion in submarine channels is a self-reinforcing mechanism whereby developing bed roughness increases turbulence at the boundary layer, thereby inhibiting deposition, promoting sediment entrainment, and enhancing channel relief; deposition occurs in submarine channels when the boundary layer remains smooth, promoting aggradation and loss of channel relief.
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So, H., I. T. Cheng, S. L. Lau, E. Chow, T. Lam, V. W. Hung, E. Li, et al. "POS0094 EFFECTS OF RANKL INHIBITION ON PROMOTING HEALING OF BONE EROSION IN RHEUMATOID ARTHRITIS USING HR-pQCT: A 2-YEAR, RANDOMIZED, DOUBLE-BLIND, PLACEBO-CONTROLLED TRIAL." Annals of the Rheumatic Diseases 80, Suppl 1 (May 19, 2021): 257. http://dx.doi.org/10.1136/annrheumdis-2021-eular.2752.
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Background:Partial repair of bone erosions in rheumatoid arthritis (RA) is known from high-resolution peripheral quantitative computer tomography (HR-pQCT) studies in patients with moderate to high disease activity using biologics [1]. Whether RANKL inhibition by denosumab is efficacious in healing existing erosions in RA patients with low disease activity or in remission on conventional synthetic DMARDs is uncertain.Objectives:To evaluate the effects of denosumab on erosion healing at 2-4 metacarpophalangeal head as determined by HR-pQCT in patients with RA with stable disease.Methods:This was a randomized, placebo-controlled, double-blind study. RA patients with disease activity score 28 joints (DAS28) ≤5.1 were randomized (1:1) to subcutaneous denosumab 60 mg or placebo once every six months for 24 months. The primary outcome was erosion healing at MCP 2-4 on HR-pQCT at 12 months. The effects of denosumab on erosion and joint space parameters on HR-pQCT and radiographs, disease activity and health assessment questionnaire-disability index (HAQ-DI) were also examined.Results:At 24 months, HR-pQCT images were analyzed in 98 patients. Baseline demographic, clinical characteristics and imaging parameters were comparable between the two treatment groups (table 1). Seventeen patients in each group (placebo group: 17/52, 32.6%; denosumab group: 17/50, 34.0%) achieved sustained low disease activity (DAS28 ≤ 3.2) throughout the 24 months. At 12 months, changes in erosion parameters on HR-pQCT were similar between the two groups. At 24 months, new erosions (19% vs 9%, p=0.009) and erosion progression (34% vs 16%, p<0.001) were more common in the placebo group than the denosumab group. Erosion healing was seen in a significantly higher proportion of patients in the denosumab group (20% vs 6%, p=0.045) at 24 months. The details of the changes in HR-pQCT erosion parameters are shown in figure 1. No significant differences in the changes in joint space parameters on HR-pQCT, van der Heijde-Sharp erosion score, DAS28 and HAQ-DI were observed between the two groups at 12 and 24 months.Table 1.Baseline clinical, demographic, disease activity parameters and medicationsPlacebo (n=55)Denosumab (n=55)Total (n=110)Age56.5 ± 7.157.2 ± 8.556.8 ± 7.8Gender (Female)47 (86)41 (75)88 (80)Disease duration (years)8.5 ± 6.87.3 ± 6.97.9 ± 6.8Rheumatoid factor positive40 (72)38 (69)78 (71)ACPA positive43 (78)44 (80)87 (79)DAS28-CRP2.43 ± 0.832.6 ± 0.922.51 ± 0.88DAS28-CRP>3.28 (15)13 (24)21 (19)HAQ-DI (0-3)0.31 ± 0.380.46 ± 0.470.39 ± 0.43csDMARDs49 (89)52 (95)101 (92)Combination csDMARDs26 (47)33 (60)59 (54)Glucocorticoids5 (10)5 (9)10 (9)vdH- Sharp erosion score10.4 ± 18.48.9 ± 13.89.6 ± 16.2vdH- Sharp JSN score12.4 ± 17.711.5 ± 17.211.9 ± 17.4Lumbar spine aBMD, g/cm20.914 ± 0.1470.930 ± 0.1430.922 ± 0.145Total hip aBMD, g/cm20.837 ± 0.1020.847 ± 0.1460.841 ± 0.125Femoral neck aBMD, g/cm20.681 ± 0.0990.695 ± 0.1280.687 ± 0.114Data are reported as mean ± SD or number (%). ACPA: Anti-cyclic citrullinated peptide antibody; DAS28: disease activity score 28; csDMARDs: conventional synthetic disease modifying anti-rheumatic drug. HAQ-DI: health assessment questionnaire disability index; vdH- Sharp score: Van der Heijde- Sharp score; aBMD: areal bone mineral densityConclusion:Although no differences in erosion parameters were observed at 12 months, denosumab was more efficacious than placebo in erosion repair on HR-pQCT after 24 months.References:[1]Finzel S, Rech J, Schmidt S, et al. Interleukin-6 receptor blockade induces limited repair of bone erosions in rheumatoid arthritis: a micro CT study. Ann Rheum Dis 2013;72:396-400.Figure 1.Changes in erosion parameters by HR-pQCT. (A) Percentage of patients with overall erosion healing; (B) Outcome of individual erosion with healing, progression and new erosion detected across study period; change in (C) mean erosion volume; (D) total erosion volume; (E) erosion width; (F) erosion depth and (G) marginal osteosclerosis per patient.Disclosure of Interests:Ho SO: None declared, Isaac T. Cheng: None declared, Sze-Lok Lau: None declared, Evelyn Chow: None declared, Tommy Lam: None declared, Vivian W Hung: None declared, Edmund Li: None declared, James F Griffith: None declared, Vivian WY Lee: None declared, Lin Shi: None declared, Junbin Huang: None declared, Yan Kitty Kwok: None declared, Isaac C Yim: None declared, Tena K. Li: None declared, Vincent Lo: None declared, Jolly M Lee: None declared, Jack Jock Wai Lee: None declared, Ling Qin: None declared, Lai-Shan Tam Grant/research support from: Grants from Novartis and Pfizer
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Giosan, Liviu, Camilo Ponton, Muhammed Usman, Jerzy Blusztajn, Dorian Q. Fuller, Valier Galy, Negar Haghipour, et al. "Short communication: Massive erosion in monsoonal central India linked to late Holocene land cover degradation." Earth Surface Dynamics 5, no. 4 (December 1, 2017): 781–89. http://dx.doi.org/10.5194/esurf-5-781-2017.
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Abstract. Soil erosion plays a crucial role in transferring sediment and carbon from land to sea, yet little is known about the rhythm and rates of soil erosion prior to the most recent few centuries. Here we reconstruct a Holocene erosional history from central India, as integrated by the Godavari River in a sediment core from the Bay of Bengal. We quantify terrigenous fluxes, fingerprint sources for the lithogenic fraction and assess the age of the exported terrigenous carbon. Taken together, our data show that the monsoon decline in the late Holocene significantly increased soil erosion and the age of exported organic carbon. This acceleration of natural erosion was later exacerbated by the Neolithic adoption and Iron Age extensification of agriculture on the Deccan Plateau. Despite a constantly elevated sea level since the middle Holocene, this erosion acceleration led to a rapid growth of the continental margin. We conclude that in monsoon conditions aridity boosts rather than suppresses sediment and carbon export, acting as a monsoon erosional pump modulated by land cover conditions.
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RENESES, SONSOLES, MARÍA F. GONZÁLEZ-ESCRIBANO, ANTONIO FERNÁNDEZ-SUÁREZ, LUIS PESTANA, BERNABÉ DAVILA, INGEBORG WICHMANN, and ALICIA GARCÍA. "The Value of HLA-DRB1 Shared Epitope, −308 Tumor Necrosis Factor-α Gene Promoter Polymorphism, Rheumatoid Factor, Anti-Citrullinated Peptide Antibodies, and Early Erosions for Predicting Radiological Outcome in Recent-Onset Rheumatoid Arthritis." Journal of Rheumatology 36, no. 6 (May 1, 2009): 1143–49. http://dx.doi.org/10.3899/jrheum.081075.
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Objective.To study the value of HLA-DRB1 shared epitope (SE), −308 tumor necrosis factor-α (TNF-α) gene promoter polymorphism, rheumatoid factor (RF), anti-citrullinated peptide antibodies (anti-CCP), and baseline erosions for predicting radiological outcome at 1 year in patients with recent-onset rheumatoid arthritis (RA).Methods.Radiological damage was assessed by radiographs at baseline and at 1 year in an inception cohort of 134 RA patients with disease duration ≤ 1 year at study entry. Radiographs were scored with the modified Sharp/van der Heijde (SvdH) erosion score for hands, wrists, and feet. The predictive value of the variables was studied by multiple linear regression analysis, using immunogenetic factors, baseline SvdH erosion score, and type of treatment during the followup period as independent variables, and SvdH erosion score at 1 year as the dependent variable.Results.The SvdH erosion score increased from the baseline visit to the 1-year visit in 49 patients (36.6%). In multiple linear regression analysis, radiological outcome was significantly predicted by SE homozygosity (ß coefficient 1.75; 95% CI 1.54, 2.96; p = 0.005) and baseline SvdH erosion score (ß coefficient 1.56; 95% CI 1.4, 1.71; p < 0.001). This model explained 78% of the variability of the dependent variable (R2 = 0.779).Conclusion.Erosive damage at 1 year in patients with recent-onset RA is significantly influenced by SE homozygosity and the presence of baseline erosions, but not by RF status, anti-CCP status, or −308 TNF-α genotype.