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Bigelow, Seth W., James R. Runkle, and Evan M. Oswald. "Competition, Climate, and Size Effects on Radial Growth in an Old-Growth Hemlock Forest." Forests 11, no. 1 (December 31, 2019): 52. http://dx.doi.org/10.3390/f11010052.
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Research Highlights: We applied neighborhood and dendro-ecological methods in a stand with a 33-year record of forest dynamics, finding that growth will decrease for several species under predicted climate trends. Background and Objectives: Conventional tree-ring analysis removes the influence of competition and size on growth, precluding assessment of the relative influence of these factors. An old-growth eastern hemlock forest in east–central New York was mapped in 1978 and was measured at eight-year intervals since then. Our objective was to use these data to examine the influence of climate, neighborhood, and tree size on radial growth. Materials and Methods: We evaluated an array of climatic indices to find which ones had the strongest influence on radial growth from increment cores of eastern hemlock (Tsuga canadensis L.), yellow birch (Betula alleghaniensis Britton), and sugar maple (Acer saccharum Marsh.). We used the strongest climatic indices in combination with neighborhood and target-tree size information to create growth models for the three tree species. Results: Size accounted for 2% to 21% of observed growth; the shade-tolerant sugar maple and eastern hemlock grew fastest when large, but the mid-tolerant yellow birch grew fastest when small. Competition accounted for 9% to 21% of growth; conifers had a weaker competitive effect than deciduous trees, and eastern hemlock was less sensitive to competition than sugar maple and yellow birch. Climate accounted for only 2% of growth variation; eastern hemlock showed a positive response to warming climate trends, but yellow birch and sugar maple showed negative responses. Conclusions: Predicted climate trends are likely to result in decreased growth of sugar maple and yellow birch, and the sensitivity of these species to competition suggests the effect will be exacerbated when they grow in crowded conditions.
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Ivcevic, Zorana, Jessica D. Hoffmann, and Julie A. McGarry. "Scaffolding Positive Creativity in Secondary School Students." Education Sciences 12, no. 4 (March 26, 2022): 239. http://dx.doi.org/10.3390/educsci12040239.
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Guided by research in creativity studies, moral development, and positive youth development, this paper proposes four principles to guide education toward positive creativity: (1) building prosocial motivation, (2) building emotion skills to build persistence, (3) building an understanding of creativity as dynamic, and (4) building self-concept of positive creativity. To illustrate applying these theoretically derived principles to teaching positive creativity, we provide examples from the inspirED program for secondary school students, which aims to build a more positive social and emotional climate through student-led creative projects. The four phases of the inspirED program—Assess the problems, Brainstorm ideas, Complete a project, and Debrief the project’s impact—are mapped onto the four principles of teaching for positive creativity.
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Parker, Sharon, W. C. Shortle, and K. T. Smith. "Identification of gram-positive bacteria isolated from initial stages of wound-initiated discoloration of red maple." Forest Pathology 24, no. 1 (March 1994): 48–54. http://dx.doi.org/10.1111/j.1439-0329.1994.tb01322.x.
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Marsitin, Retno. "P Pelatihan Grafik Maple dalam Pembelajaran Matematika." Jurnal Pengabdian Barelang 2, no. 02 (July 1, 2020): 26. http://dx.doi.org/10.33884/jpb.v2i02.1915.
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Nowadays, the mathematics teachers have to implement mathematics learning using technology, especially for vocational mathematics teachers. Technological applications that can be utilized in learning mathematics include maple. Maple is mathematical software that integrates computational capabilities both symbolic and numerical, graphics are very influential to help in solving mathematical problems. The method offered in solving partner problems is by organizing maple graph training and mentoring in applying maple graphics in mathematics learning. The success of this community service activity is supported by some factors, namely: high interest and desire in participating in training activities to completion, interest and support from Singosari PGRI Vocational School as a partner school in maple graph training activities, active involvement so that there is mutual sharing of knowledge about maple graphics. The community service activity with maple graphic training gets a positive response from vocational teachers with an achievement of 93%, the results of the presentation of maple graphics with very good achievements are 87%. This community service activity with maple graphic training for Singosari Vocational School teachers are very useful in adding insight of computer knowledge, especially the use of maple graphics, and fostering creativity and skills in using maple graphics in mathematics learning.
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Beiranvand, Mohammad, and Mojtaba Ghasemi Kamalvand. "Positive Integer Powers of Certain Tridiagonal Matrices and Corresponding Anti-Tridiagonal Matrices." Advances in Mathematical Physics 2022 (July 15, 2022): 1–5. http://dx.doi.org/10.1155/2022/8445721.
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In this paper, we firstly derive a general expression for the entries of the m th ( m ∈ ℕ ) power for two certain types of tridiagonal matrices of arbitrary order. Secondly, we present a method for computing the positive integer powers of the anti-tridiagonal matrix corresponding to these matrices. Also, we give Maple 18 procedures in order to verify our calculations.
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Zhang, Yin, Gen Sheng Wu, Wei Si, Jing Jie Sha, Lei Liu, and Yun Fei Chen. "Nanopore Positive Pulse Detection of DNA with Salt Gradients." Key Engineering Materials 656-657 (July 2015): 567–72. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.567.
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Nanopore based sensors have been widely spread utilized for detection and analysis of various single charged molecules. However, collision and trap events also block the ionic current that interferes recording the actually translocation events. In order to resolve the problem, we propose inducing a salt gradient to turn the pulse form negative to positive. And the salt gradients dependence of pulse signals ranging from 1 M (cis & trans) to 1 M (cis) - 4 M (trans) is mapped. Experiment results demonstrate that applying a high salt gradient prolong translocation time 1.5 times and increase molecule capture rate by a fact of 3. It is benefit for nanopore further application.
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Gómez-Manjón, Irene, Ana Moreno-Izquierdo, Sonia Mayo, Marta Moreno-García, Aitor Delmiro, David Escribano, and F. Javier Fernández-Martínez. "Noninvasive Prenatal Testing: Comparison of Two Mappers and Influence in the Diagnostic Yield." BioMed Research International 2018 (June 7, 2018): 1–6. http://dx.doi.org/10.1155/2018/9498140.
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Objective. The aim of this study was to determine if the use of different mappers for NIPT may vary the results considerably. Methods. Peripheral blood was collected from 217 pregnant women, 58 pathological (34 pregnancies with trisomy 21, 18 with trisomy 18, and 6 with trisomy 13) and 159 euploid. MPS was performed following a manufacturer’s modified protocol of semiconductor sequencing. Obtained reads were mapped with two different software programs: TMAP and HPG-Aligner, comparing the results. Results. Using TMAP, 57 pathological samples were correctly detected (sensitivity 98.28%, specificity 93.08%): 33 samples as trisomy 21 (sensitivity 97.06%, specificity 99.45%), 16 as trisomy 18 (sensibility 88.89%, specificity 93.97%), and 6 as trisomy 13 (sensibility 100%, specificity 100%). 11 false positives, 1 false negative, and 2 samples incorrectly identified were obtained. Using HPG-Aligner, all the 58 pathological samples were correctly identified (sensibility 100%, specificity 96.86%): 34 as trisomy 21 (sensibility 100%, specificity 98.91%), 18 as trisomy 18 (sensibility 100%, specificity 98.99%), and 6 as trisomy 13 (sensibility 100%, specificity 99.53%). 5 false positives were obtained. Conclusion. Different mappers use slightly different algorithms, so the use of one mapper or another with the same batch file can provide different results.
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Reilly, Andrew A., Ronald Bellisario, and Kenneth A. Pass. "Multivariate discrimination for phenylketonuria (PKU) and non-PKU hyperphenylalaninemia after analysis of newborns’ dried blood-spot specimens for six amino acids by ion-exchange chromatography." Clinical Chemistry 44, no. 2 (February 1, 1998): 317–26. http://dx.doi.org/10.1093/clinchem/44.2.317.
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Abstract Ion-exchange HPLC was developed for testing dried blood-spot specimens from newborns. The method is suitable for quantitative confirmatory testing of abnormal specimens detected in the New York State Newborn Screening Program. Positive specimens were initially identified among all New York State newborns with semiquantitative bacterial inhibition assays (BIA) for aminoacidopathies, including phenylketonuria (PKU) and non-PKU hyperphenylalaninemia (HP), maple syrup urine disease, and homocystinuria. A selection of 1346 specimens from routine BIA screening, including 131 newborns with PKU or persistent HP, were tested by HPLC. Of 179 BIA results that were falsely positive, 98 (55%) were also falsely positive by HPLC in which the Phe/Tyr ratio was the discriminator and the threshold was set to attain 100% sensitivity. Investigation of three multivariate discriminatory methods revealed that linear discriminant analysis excluded all but 35 (20%) of the BIA false-positives.
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Wek, R. C., M. Ramirez, B. M. Jackson, and A. G. Hinnebusch. "Identification of positive-acting domains in GCN2 protein kinase required for translational activation of GCN4 expression." Molecular and Cellular Biology 10, no. 6 (June 1990): 2820–31. http://dx.doi.org/10.1128/mcb.10.6.2820-2831.1990.
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GCN4 is a transcriptional activator of amino acid-biosynthetic genes in the yeast Saccharomyces cerevisiae. GCN2, a translational activator of GCN4 expression, contains a domain homologous to the catalytic subunit of eucaryotic protein kinases. Substitution of a highly conserved lysine residue in the kinase domain abolished GCN2 regulatory function in vivo and its ability to autophosphorylate in vitro, indicating that GCN2 acts as a protein kinase in stimulating GCN4 expression. Elevated GCN2 gene dosage led to derepression of GCN4 under nonstarvation conditions; however, we found that GCN2 mRNA and protein levels did not increase in wild-type cells in response to amino acid starvation. Therefore, it appears that GCN2 protein kinase function is stimulated posttranslationally in amino acid-starved cells. Three dominant-constitutive GCN2 point mutations were isolated that led to derepressed GCN4 expression under nonstarvation conditions. Two of the GCN2(Con) mutations mapped in the kinase domain itself. The third mapped just downstream from a carboxyl-terminal segment homologous to histidyl-tRNA synthetase (HisRS), which we suggested might function to detect uncharged tRNA in amino acid-starved cells and activate the adjacent protein kinase moiety. Deletions and substitutions in the HisRS-related sequences and in the carboxyl-terminal segment in which one of the GCN2(Con) mutation mapped abolished GCN2 positive regulatory function in vivo without lowering autophosphorylation activity in vitro. These results suggest that sequences flanking the GCN2 protein kinase moiety are positive-acting domains required to increase recognition of physiological substrates or lower the requirement for uncharged tRNA to activate kinase activity under conditions of amino acid starvation.
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Wek, R. C., M. Ramirez, B. M. Jackson, and A. G. Hinnebusch. "Identification of positive-acting domains in GCN2 protein kinase required for translational activation of GCN4 expression." Molecular and Cellular Biology 10, no. 6 (June 1990): 2820–31. http://dx.doi.org/10.1128/mcb.10.6.2820.
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GCN4 is a transcriptional activator of amino acid-biosynthetic genes in the yeast Saccharomyces cerevisiae. GCN2, a translational activator of GCN4 expression, contains a domain homologous to the catalytic subunit of eucaryotic protein kinases. Substitution of a highly conserved lysine residue in the kinase domain abolished GCN2 regulatory function in vivo and its ability to autophosphorylate in vitro, indicating that GCN2 acts as a protein kinase in stimulating GCN4 expression. Elevated GCN2 gene dosage led to derepression of GCN4 under nonstarvation conditions; however, we found that GCN2 mRNA and protein levels did not increase in wild-type cells in response to amino acid starvation. Therefore, it appears that GCN2 protein kinase function is stimulated posttranslationally in amino acid-starved cells. Three dominant-constitutive GCN2 point mutations were isolated that led to derepressed GCN4 expression under nonstarvation conditions. Two of the GCN2(Con) mutations mapped in the kinase domain itself. The third mapped just downstream from a carboxyl-terminal segment homologous to histidyl-tRNA synthetase (HisRS), which we suggested might function to detect uncharged tRNA in amino acid-starved cells and activate the adjacent protein kinase moiety. Deletions and substitutions in the HisRS-related sequences and in the carboxyl-terminal segment in which one of the GCN2(Con) mutation mapped abolished GCN2 positive regulatory function in vivo without lowering autophosphorylation activity in vitro. These results suggest that sequences flanking the GCN2 protein kinase moiety are positive-acting domains required to increase recognition of physiological substrates or lower the requirement for uncharged tRNA to activate kinase activity under conditions of amino acid starvation.
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Beiranvand, Mohammad, and Mojtaba Ghasemi Kamalvand. "Explicit Expression for Arbitrary Positive Integer Powers of Special Sparse Matrices." Journal of Mathematics 2022 (December 12, 2022): 1–13. http://dx.doi.org/10.1155/2022/1076545.
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Sparse matrices appear frequently in mathematical models. In this paper, we firstly present a general expression for the entries of the r th r ∈ ℕ power of a certain n -square sparse matrix, in terms of the Chebyshev polynomials of the second kind. Secondly, we present a method for integer positive powers of the skew matrix corresponding to these sparse matrices. This method will be inspiring to calculate the positive integer powers of the similar matrices. Finally, we present some examples to illustrate our results. Also, we give maple 18 procedures in order to verify our calculations.
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Kawaiah, Abdal Hadi, Ananda Kumar Kondepati, Shalini Devaprasad Pasumarthi, Tulika Mishra, Pratik Kumar Singh, and Pukhraj Singh Nijhar. "MARPE for the treatment and cure of OSAS: Aruba experience." Asian Journal of Medical Sciences 11, no. 5 (September 1, 2020): 103–7. http://dx.doi.org/10.3126/ajms.v11i5.27803.
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Obstructive sleep apnea syndrome (OSAS) is defined as “the stoppage of ventilation or incidence of significant hypoventilation during sleep, which is characterized by episodes of partial or complete upper airway obstruction related with hypoxemia and/or hypercarbia. There have been many treatments reported for this syndrome including Mandibular repositioning appliance (MRA), continuous positive airway pressure (CPAP), weight loss, exercise, intraoral appliance therapy, soft tissue procedures, and maxillomandibular advancement (MMA) surgery. Present study is an attempt where three patients of OSAS have been treated withMiniscrew-assisted rapid palatal expansion (MARPE). The results of BMI, AHI index showed the promising effect. Even the use of MARPE has improved the air flow and increased the rapid palatal area.
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Koev, Gennadiy, and W. Allen Miller. "A Positive-Strand RNA Virus with Three Very Different Subgenomic RNA Promoters." Journal of Virology 74, no. 13 (July 1, 2000): 5988–96. http://dx.doi.org/10.1128/jvi.74.13.5988-5996.2000.
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ABSTRACT Numerous RNA viruses generate subgenomic mRNAs (sgRNAs) for expression of their 3′-proximal genes. A major step in control of viral gene expression is the regulation of sgRNA synthesis by specific promoter elements. We used barley yellow dwarf virus (BYDV) as a model system to study transcriptional control in a virus with multiple sgRNAs. BYDV generates three sgRNAs during infection. The sgRNA1 promoter has been mapped previously to a 98-nucleotide (nt) region which forms two stem-loop structures. It was determined that sgRNA1 is not required for BYDV RNA replication in oat protoplasts. In this study, we show that neither sgRNA2 nor sgRNA3 is required for BYDV RNA replication. The promoters for sgRNA2 and sgRNA3 synthesis were mapped by using deletion mutagenesis. The minimal sgRNA2 promoter is approximately 143 nt long (nt 4810 to 4952) and is located immediately downstream of the putative sgRNA2 start site (nt 4809). The minimal sgRNA3 core promoter is 44 nt long (nt 5345 to 5388), with most of the sequence located downstream of sgRNA3 start site (nt 5348). For both promoters, additional sequences upstream of the start site enhanced sgRNA promoter activity. These promoters contrast to the sgRNA1 promoter, in which almost all of the promoter is located upstream of the transcription initiation site. Comparison of RNA sequences and computer-predicted secondary structures revealed little or no homology between the three sgRNA promoter elements. Thus, a small RNA virus with multiple sgRNAs can have very different subgenomic promoters, which implies a complex system for promoter recognition and regulation of subgenomic RNA synthesis.
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Sušanj, Zoran. "Položaj nagrađivanja u dvodimenzionalnom prostoru faceta organizacijske klime." Suvremena psihologija 24, no. 1 (2021): 45–60. http://dx.doi.org/10.21465/2021-sp-241-05.
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Organizacijska se klima odnosi na doživljaj različitih, zaposlenicima relevantnih aspekata organizacijskog okruženja. Jedan je od njih i sustav nagrađivanja. U ovom se radu, upotrebom višedimenzionalnog skaliranja, analizira relativno značenje i položaj koji nagrađivanje zauzima u odnosu na viđenje drugih važnih faceta organizacijske klime. Analizirani su podaci prikupljeni na velikom uzorku organizacija različitih djelatnosti, a korišteni je upitnik mjerio percepciju dvanaest sadržajno različitih aspekata organizacijskog okruženja. Rezultati upućuju na semantičku sličnost nagrađivanja i drugih zaposlenicima bitnih organizacijskih sustava - napredovanja i informiranja, dok su percepcije stavova zaposlenika prema radu i organizaciji - odnos prema kvaliteti rada, motivacija i zaokupljenost, inovativnost i inicijativa te pripadnost organizaciji - relativno najudaljenije ovoj faceti klime. Nastoje se ponuditi različita teorijska objašnjenja mogućih interpretacija ukupne kognitivne mape organizacijskog konteksta, a raspravlja se i o praktičnim implikacijama dobivenih rezultata u području upravljanja i razvoja ljudskih potencijala. Ključne riječi: nagrađivanje, organizacijska klima, višedimenzionalno skaliranje
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Ferrari, James B. "Fine-scale patterns of leaf litterfall and nitrogen cycling in an old-growth forest." Canadian Journal of Forest Research 29, no. 3 (March 1, 1999): 291–302. http://dx.doi.org/10.1139/x98-198.
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Spatial patterns of litterfall and soil nitrogen (N) mineralization were investigated in an old growth hemlock-hardwood forest to test the hypothesis that the lignin/N ratio of litterfall is negatively correlated with soil N availability. Litterfall was measured at 50 small subplots on a 7.2-ha mapped plot in Sylvania Wilderness Area, Michigan, where there is pronounced patchiness of species in the canopy. Nitrogen mineralization and nitrification were measured concurrently at the subplots using buried-bag incubations. Total aboveground litterfall was 3723 kg·ha-1 per year with leaf litterfall contributing 69% of the total, and N mineralization was 68.0 kg·ha-1 per year. The lignin/N ratios of leaf litter and total litterfall were negatively correlated with soil N mineralization and nitrification at the 50 subplots. Nitrogen mineralization rates, especially percent nitrification, were higher where basswood and sugar maple litterfall dominated and lower where hemlock litterfall was high, demonstrating the importance of litterfall and leaf litter chemistry to soil N pattern on a fine spatial scale. The effect of leaf litter chemistry on soil N may be a positive feedback mechanism that maintains the landscape-scale canopy mosaic at Sylvania.
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Ali, Rosihan M., Naveen Kumar Jain, and V. Ravichandran. "On the Largest Disc Mapped by Sum of Convex and Starlike Functions." Abstract and Applied Analysis 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/682413.
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For a normalized analytic functionfdefined on the unit disc𝔻, letϕ(f,f′,f′′;z)be a function of positive real part in𝔻,ψ(f,f′,f′′;z)need not have that property in𝔻, andχ=ϕ+ψ. For certain choices ofϕandψ, a sharp radius constantρis determined,0<ρ<1, so thatχ(ρz)/ρmaps𝔻onto a specified region in the right half-plane.
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Rankl, M., C. Kienholz, and M. Braun. "Glacier changes in the Karakoram region mapped by multimission satellite imagery." Cryosphere 8, no. 3 (May 23, 2014): 977–89. http://dx.doi.org/10.5194/tc-8-977-2014.
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Abstract. Positive glacier-mass balances in the Karakoram region during the last decade have fostered stable and advancing glacier termini positions, while glaciers in the adjacent mountain ranges have been affected by glacier recession and thinning. In addition to fluctuations induced solely by climate, the Karakoram is known for a large number of surge-type glaciers. The present study provides an updated and extended inventory on advancing, stable, retreating, and surge-type glaciers using Landsat imagery from 1976 to 2012. Out of 1219 glaciers the vast majority showed a stable terminus (969) during the observation period. Sixty-five glaciers advanced, 93 glaciers retreated, and 101 surge-type glaciers were identified, of which 10 are new observations. The dimensional and topographic characteristics of each glacier class were calculated and analyzed. Ninety percent of nonsurge-type glaciers are shorter than 10 km, whereas surge-type glaciers are, in general, longer. We report short response times of glaciers in the Karakoram and suggest a shift from negative to balanced/positive mass budgets in the 1980s or 1990s. Additionally, we present glacier surface velocities derived from different SAR (synthetic aperture radar) sensors and different years for a Karakoram-wide coverage. High-resolution SAR data enables the investigation of small and relatively fast-flowing glaciers (e.g., up to 1.8 m day−1 during an active phase of a surge). The combination of multitemporal optical imagery and SAR-based surface velocities enables an improved, Karakoram-wide glacier inventory and hence, provides relevant new observational information on the current state of glaciers in the Karakoram.
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Guo, Yunlong, and Shuzhen Ren. "Bilayer PMMA antireflective coatings via microphase separation and MAPLE." Journal of Polymer Engineering 41, no. 2 (December 29, 2020): 164–73. http://dx.doi.org/10.1515/polyeng-2020-0198.
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Abstract A poly(methyl methacrylate) (PMMA) bilayer antireflective coating (ARC) is designed based on polymeric microphase separation and matrix-assisted pulsed laser evaporation (MAPLE). The spin-coated layer shows subwavelength porous network structures, after phase separation via annealing and removal of the polystyrene (PS) phase, while the MAPLE deposited surface layer exhibits a biomimic moth-eye structure on glass to trap the incident light. The elaborate spin coated structure can be controlled flexibly by changing the ratio of mixture, annealing time and temperature, and the moth-eye structure can also be tuned by deposition parameters. The transmittance of the ARC presents a maximum of 95.64% and an average of 94.81% in visible range. The moth-eye structure on glass substrate formed by nanoglobules makes positive contributions to the improvement of transmittance according to UV–Vis result and simulation. The wetting motion of PMMA globules is observed as well by the comparison of AFM surface morphologies and cross-sectional profiles of globules on glass and polymer thin film. This work is a novel attempt to fabricate bilayer ARC with two different structures by a single polymeric material and will provide new route for fabrication of multilayer ARCs.
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Mosora, Larysa, Vitalii Tolubyak, Jarosław Brodny, Liubomyr Romanyshyn, and Yurii Mosora. "Migration Factor of Stimuling the Development of the Production Industry in Ukraine and Poland." Multidisciplinary Aspects of Production Engineering 3, no. 1 (September 1, 2020): 732–44. http://dx.doi.org/10.2478/mape-2020-0061.
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AbstractThe article examines the influence of migration processes on the formation and development of production capacities of countries. It is emphasized that population migration significantly affects the social and economic indicators of the country; under such influence, they can have both positive and negative trends. The article presents the main positive and negative consequences of population migration for donor countries, recipient countries, and for migrants themselves. It is proved that one of the most popular and promising is educational migration, which, under certain favorable circumstances, makes it possible to form highly qualified personnel, deepen international cooperation between higher education institutions of different countries, and strengthen the joint use of educational and scientific potential. The attention is focused on the fact that Ukraine today acts as a donor country and a leader in the number of young people who travel to study in Poland. It is indicated that in order to effectively regulate migration processes by the state, it is appropriate to ensure interaction between higher education institutions of different countries, namely, in the sphere of: a double-degree program, foreign internships, and holding joint international conferences. Using the example of Ivano-Frankivsk National Technical University of Oil and Gas and Ternopil National Economic University, it is shown how such interaction is implemented in practice and its consequences. The conclusions are based on the fact that educational migration is one of the most favorable types of migration. With its proper control by the state, it is possible to stimulate the development of the production industry in countries and improve social and economic indicators.
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Grumezescu, Valentina, Irina Negut, Rodica Cristescu, Alexandru Mihai Grumezescu, Alina Maria Holban, Florin Iordache, Mariana Carmen Chifiriuc, Roger J. Narayan, and Douglas B. Chrisey. "Isoflavonoid-Antibiotic Thin Films Fabricated by MAPLE with Improved Resistance to Microbial Colonization." Molecules 26, no. 12 (June 14, 2021): 3634. http://dx.doi.org/10.3390/molecules26123634.
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Staphylococcus aureus (Gram-positive) and Pseudomonas aeruginosa (Gram-negative) bacteria represent major infectious threats in the hospital environment due to their wide distribution, opportunistic behavior, and increasing antibiotic resistance. This study reports on the deposition of polyvinylpyrrolidone/antibiotic/isoflavonoid thin films by the matrix-assisted pulsed laser evaporation (MAPLE) method as anti-adhesion barrier coatings, on biomedical surfaces for improved resistance to microbial colonization. The thin films were characterized by Fourier transform infrared spectroscopy, infrared microscopy, and scanning electron microscopy. In vitro biological assay tests were performed to evaluate the influence of the thin films on the development of biofilms formed by Gram-positive and Gram-negative bacterial strains. In vitro biocompatibility tests were assessed on human endothelial cells examined for up to five days of incubation, via qualitative and quantitative methods. The results of this study revealed that the laser-fabricated coatings are biocompatible and resistant to microbial colonization and biofilm formation, making them successful candidates for biomedical devices and contact surfaces that would otherwise be amenable to contact transmission.
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Besti, Novianda. "Short Term Forecasting Method: Covid 19 and Capital Market in Indonesia." Jurnal Manajemen Stratejik dan Simulasi Bisnis 3, no. 1 (October 26, 2022): 35–48. http://dx.doi.org/10.25077/mssb.3.1.35-48.2022.
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This study aimed to predict the short-term confirmed Covid 19 and Jakarta Composite Index (JCI) cases in Indonesia. The prediction uses ARIMA and SutteARIMA methods, and the data processed with R software. Researcher using time series data from April 2nd, 2020 (the date of covid 19 detected in Indonesia) to September 30th, 2020. We are fitted the data with the data from October 1st to October 10th, 2020. Based on the fitted data, we could forecast the cases from October 11th to October 31st, 2020. We applied the Mean Absolute Percentage Error (MAPE) to predict accuracy measures to evaluate forecasting methods. Based on forecasting with ARIMA and SutteARIMA methods, the SutteARIMA method is more suitable than ARIMA to calculate the daily forecasts of negative Covid 19 in Indonesia with MAPE value of 0.156 (smaller than 0.21 compared to MAPE value of ARIMA). At the same time, the ARIMA method is more suitable than SutteARIMA to calculate the daily forecasts of positive Covid 19 and JCI in Indonesia. The MAPE value of 0.06 (smaller than 0.104 compared to MAPE value of SutteARIMA for positive Covid 19) and MAPE value of 0.012 (smaller than 0.021 compared to MAPE value of SutteARIMA for JCI Indonesia).
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Preece, John E., Carl A. Huetteman, W. Clark Ashby, Paul L. Roth, and Richard G. Adams. "030 GENOTYPIC AND PHENOTYPIC FIELD GROWTH CORRELATIONS OF MICROPROPAGATED SILVER MAPLE." HortScience 29, no. 5 (May 1994): 432a—432. http://dx.doi.org/10.21273/hortsci.29.5.432a.
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Sixty clones (four clones from each of 15 provenances) were micropropagated and planted in replicated plots in lowland and upland sites in Carbondale, IL in 1991. Data were collected on tree growth, including basal caliper, height, branching, crown volume, dates of bud break, bud set, and leaf fall. There were significant and strong positive genotypic and phenotypic correlations between tree height and basal caliper throughout the three years of growth. During 1993, bud break was not significantly correlated with any growth parameters. After three years in the field, tree height was significantly negatively correlated with the amount of callus that had formed after one month during the in vitro micropropagation phase. However, all shoots that formed in vitro were of axillary origin.
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Krahl, Kimberly H., Michael A. Dirr, Tracy M. Halward, Gary D. Kochert, and William M. Randle. "Use of Single-Primer DNA Amplifications for the Identification of Red Maple (Acer rubrum L.) Cultivars." Journal of Environmental Horticulture 11, no. 2 (June 1, 1993): 89–92. http://dx.doi.org/10.24266/0738-2898-11.2.89.
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Abstract Positive cultivar identification is often difficult or impossible based solely on morphological traits. A technique ensuring reliable, repeatable, and unique cultivar identification is needed. The use of molecular markers offers such a technique, allowing assessment of fine levels of variation directly at the DNA level. In this study, RAPD (Random Amplified Polymorphic DNA) markers were investigated for their utility to identify red maple cultivars. Three out of nineteen primers tested resulted in unique banding patterns for all the maples tested, including 9 red maple clones, 5 silver maple seedlings, and 4 purported interspecific cultivars. The red maple cultivars ‘Red Sunset’ and ‘October Glory’, which are almost indistinguishable morphologically as young trees, were clearly distinguished using RAPD markers. RAPD markers provide a consistently reliable technique for red maple cultivar identification.
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Meng, Xue, Ya-Qi Chang, Liu-Yan Zhou, and Zong-Jun Du. "Exiguobacterium flavidum sp. nov., isolated from the Red Maple Lake." International Journal of Systematic and Evolutionary Microbiology 70, no. 4 (April 1, 2020): 2359–65. http://dx.doi.org/10.1099/ijsem.0.004048.
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A Gram-stain-positive, motile, facultatively anaerobic, non-sporing, and rod-shaped bacterial strain, designated HF60T, was isolated from the Red Maple Lake of Guizhou Province, China. The DNA G+C content of the strain HF60T was 55.0 %. The predominant isoprenoid quinones were identified as MK-7 (56.4 %) and MK-8 (35.7 %). The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and aminophosphoglycolipid. The major fatty acids were anteiso-C13 : 0, iso-C15 : 0, C16 : 0 and iso-C13 : 0. The strain had cell wall peptidoglycan type A3α l-Lys-Gly. Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain HF60T belonged to the genus Exiguobacterium and was most closely related to Exiguobacterium sibiricum JCM 13490T (97.2 % 16S rRNA gene sequence similarity), followed by Exiguobacterium undae DSM 14481T (97.1 %), Exiguobacterium antarcticum DSM 14480T (96.9 %) and Exiguobacterium aurantiacum NBRC 14763T (94.5 %). The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness indicated that strain HF60T can be considered to represent a novel species of the genus Exiguobacterium , for which the name Exiguobacterium flavidum sp. nov. is proposed, The type strain is HF60T (=MCCC 1H00336T=KCTC 33987T).
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McEathron, K. M., M. J. Mitchell, and L. Zhang. "Acid-base characteristics of the Grass Pond watershed in the Adirondack Mountains of New York State, USA: interactions among soil, vegetation and surface waters." Hydrology and Earth System Sciences 17, no. 7 (July 9, 2013): 2557–68. http://dx.doi.org/10.5194/hess-17-2557-2013.
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Abstract. Grass Pond watershed is located within the southwestern Adirondack Mountain region of New York State, USA. This region receives some of the highest rates of acidic deposition in North America and is particularly sensitive to acidic inputs due to many of its soils having shallow depths and being generally base poor. Differences in soil chemistry and tree species between seven subwatersheds were examined in relation to acid-base characteristics of the seven major streams that drain into Grass Pond. Mineral soil pH, stream water BCS (base-cation surplus) and pH exhibited a positive correlation with sugar maple basal area (p = 0.055; 0.48 and 0.39, respectively). Black cherry basal area was inversely correlated with stream water BCS, ANC (acid neutralizing capacity)c and NO3- (p = 0.23; 0.24 and 0.20, respectively). Sugar maple basal areas were positively associated with watershed characteristics associated with the neutralization of atmospheric acidic inputs while in contrast, black cherry basal areas showed opposite relationships to these same watershed characteristics. Canonical correspondence analysis indicated that black cherry had a distinctive relationship with forest floor chemistry apart from the other tree species, specifically a strong positive association with forest floor NH4, while sugar maple had a distinctive relationship with stream chemistry variables, specifically a strong positive association with stream water ANCc, BCS and pH. Our results provide evidence that sugar maple is acid-intolerant or calciphilic tree species and also demonstrate that black cherry is likely an acid-tolerant tree species.
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McEathron, K. M., M. J. Mitchell, and L. Zhang. "Acid-base characteristics of the Grass Pond watershed in the Adirondack Mountains of New York State, USA: interactions between soil, vegetation and surface waters." Hydrology and Earth System Sciences Discussions 9, no. 9 (September 24, 2012): 10775–803. http://dx.doi.org/10.5194/hessd-9-10775-2012.
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Abstract. Grass Pond watershed is located within the Southwestern Adirondack Mountain region of New York State, USA. This region receives some of the highest rates of acidic deposition in North America and is particularly sensitive to acidic inputs due to many of its soils having shallow depths and being generally base-poor. Differences in soil chemistry and tree species between seven subwatersheds were examined in relation to acid-base characteristics of the seven major streams that drain into Grass Pond. Mineral soil pH, stream water BCS and pH exhibited a positive correlation with sugar maple basal area (p = 0.055; 0.48 and 0.39, respectively). Black cherry basal area was inversely correlated with stream water BCS, ANCc and NO3– (p = 0.23; 0.24 and 0.20, respectively). Sugar maple basal areas were positively correlated with watershed characteristics associated with the neutralization of atmospheric acidic inputs while in contrast, black cherry basal areas showed opposite relationships to these same watershed characteristics. Canonical Correspondence Analysis indicated that black cherry had a distinctive relationship with forest floor chemistry apart from the other tree species, specifically a strong positive association with forest floor NH4 while sugar maple had a distinctive relationship with stream chemistry variables, specifically a strong positive association with stream water ANCc, BCS and pH. Our results provide evidence that sugar maple is acid-intolerant or calciphilic tree species and also demonstrate that black cherry is likely an acid-tolerant tree species.
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Kiss, I., Z. Bösze, P. Szabó, R. Altanchimeg, E. Barta, and F. Deák. "Identification of positive and negative regulatory regions controlling expression of the cartilage matrix protein gene." Molecular and Cellular Biology 10, no. 5 (May 1990): 2432–36. http://dx.doi.org/10.1128/mcb.10.5.2432-2436.1990.
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A complex pattern of regulation of the cartilage matrix protein gene was revealed by transient expression experiments. A minimal promoter from positions -15 to +64 functioned in chondrocytes and fibroblasts. An enhancer located in the first intron exerted chondrocyte-specific stimulation on the minimal promoter activity. The same fragment, however, had a negative effect in fibroblasts. Between -334 and -15, a silencer was found which inhibited the gene expression driven from its homologous as well as heterologous promoters both in chondrocytes and fibroblasts. Additional positive and negative control regions were mapped further upstream of the promoter.
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Kiss, I., Z. Bösze, P. Szabó, R. Altanchimeg, E. Barta, and F. Deák. "Identification of positive and negative regulatory regions controlling expression of the cartilage matrix protein gene." Molecular and Cellular Biology 10, no. 5 (May 1990): 2432–36. http://dx.doi.org/10.1128/mcb.10.5.2432.
Full textAbstract:
A complex pattern of regulation of the cartilage matrix protein gene was revealed by transient expression experiments. A minimal promoter from positions -15 to +64 functioned in chondrocytes and fibroblasts. An enhancer located in the first intron exerted chondrocyte-specific stimulation on the minimal promoter activity. The same fragment, however, had a negative effect in fibroblasts. Between -334 and -15, a silencer was found which inhibited the gene expression driven from its homologous as well as heterologous promoters both in chondrocytes and fibroblasts. Additional positive and negative control regions were mapped further upstream of the promoter.
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Tardif, Jacques, Jacques Brisson, and Yves Bergeron. "Dendroclimatic analysis of Acer saccharum, Fagus grandifolia, and Tsuga canadensis from an old-growth forest, southwestern Quebec." Canadian Journal of Forest Research 31, no. 9 (September 1, 2001): 1491–501. http://dx.doi.org/10.1139/x01-088.
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Radial growth of three tree species (eastern hemlock, Tsuga canadensis (L.) Carrière; sugar maple, Acer saccharum Marsh.; and American beech, Fagus grandifolia Ehrh.) from an old-growth forest, in southwestern Quebec was compared using a dendroclimatic approach. The beech and maple tree-ring chronologies were significantly correlated, whereas the hemlock chronology was correlated only to that of beech. Radial growth of all three species was positively correlated with precipitation and negatively correlated with temperatures during the early summer months of the year the annual ring was formed. This suggests early summer water balance limits the growth of these species on this site. Radial growth of the three species was also negatively correlated with temperatures during the late summer months of the year prior to ring formation. Only hemlock and sugar maple showed a positive correlation with precipitation during the year prior to ring formation. Of the three species, hemlock was most influenced by temperature and showed a positive correlation with winter temperatures. Our results also showed that, since the mid-19th century, certain climatic variables temporarily dominated the growthclimate association of the species. Hemlock showed the most stable growthclimate association, whereas in sugar maple, negative correlations with late winter temperature showed up during the second half of the 20th century.
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Havreljuk, Filip, Alexis Achim, and David Pothier. "Regional variation in the proportion of red heartwood in sugar maple and yellow birch." Canadian Journal of Forest Research 43, no. 3 (March 2013): 278–87. http://dx.doi.org/10.1139/cjfr-2012-0479.
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Stems of sugar maple (Acer saccharum Marsh.) and yellow birch (Betula alleghaniensis Britt.) trees often contain a column of discoloured wood known as red heartwood, which reduces lumber value. To quantify the regional-scale variation in red heartwood, 192 trees of each species were sampled in 12 locations across the temperate forest zone of southern Québec, Canada. Large regional variation in the radial proportion of red heartwood (RHP) at breast height (1.3 m) was observed in both species. Statistical modeling showed that such variation was mainly attributable to factors related to tree development. Cambial age had a strong positive effect on RHP in both species, suggesting that the occurrence of red heartwood ultimately might be unavoidable. There was also a positive effect of ring area increment at the limit of the discoloured zone. In the case of sugar maple, there was an added effect of the trend in ring area increments observed in the same zone, with a negative trend being generally indicative of a larger RHP. Further variability in this species was also associated with the annual minimum temperature of the sampling locations. The models developed for each species explained around 60% of the variance in RHP and could be used to improve forest management and wood procurement decisions.
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Ga¸siorek, Marcin, and Daniel Simson. "One-peak posets with positive quadratic Tits form, their mesh translation quivers of roots, and programming in Maple and Python." Linear Algebra and its Applications 436, no. 7 (April 2012): 2240–72. http://dx.doi.org/10.1016/j.laa.2011.10.045.
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He, Zhongqi, Rachel L. Sleighter, Patrick G. Hatcher, Shasha Liu, Fengchang Wu, Haixuan Zou, and O. Modesto Olanya. "Molecular level comparison of water extractives of maple and oak with negative and positive ion ESI FT-ICR mass spectrometry." Journal of Mass Spectrometry 54, no. 8 (July 29, 2019): 655–66. http://dx.doi.org/10.1002/jms.4379.
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Joostberens, Jarosław, and Adam Heyduk. "Laboratory Tests of a Speed Control System for Roadheader Cutting Heads." Multidisciplinary Aspects of Production Engineering 1, no. 1 (September 1, 2018): 153–59. http://dx.doi.org/10.2478/mape-2018-0020.
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Abstract The paper presents selected results of the laboratory tests of the speed control system for the R-130 roadheader with an inverter-fed cutting heads drive. The results recorded for the variable speed system have been compared with the measurement obtained for the network supplied drive. There have been noticed some oscillations after rapid current overloads. They are due to the operation of the internal current controller of the PWM-inverter, The oscillations are fast decaying - so they prove the results of initial system stability checking. Generally, the automatic speed control, tracking the optimum speed level calculating by supervisory speed adjuster makes possible to better utilize the motor power throughout the whole cutting time. The better operating conditions of the motor cause increase in the whole system power efficiency (even in spite of additional losses in the inverter circuit) Additionally the sped control reduces dynamical overloads. This fact can have a positive influence on the whole system reliability. The speed control subsystem is a part of the whole control system which contains also close-loop boom angular position and velocity control circuits.
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Kelman, Z., M. Prokocimer, S. Peller, Y. Kahn, G. Rechavi, Y. Manor, A. Cohen, and V. Rotter. "Rearrangements in the p53 gene in Philadelphia chromosome positive chronic myelogenous leukemia [see comments]." Blood 74, no. 7 (November 15, 1989): 2318–24. http://dx.doi.org/10.1182/blood.v74.7.2318.bloodjournal7472318.
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Molecular structural analysis of the p53 gene in patients with Philadelphia chromosome-positive chronic myelogenous leukemia (CML) indicates a significant incidence of gene rearrangements in patients at either accelerated phase or blastic crisis. Southern blot analysis of genomic DNA hybridizing with either genomic or cDNA p53 specific probes indicated that 30% of the CML patients at blastic crisis phase exhibited rearrangements, mostly mapping downstream to the first non- coding exon. This is compatible with the observation that the progression of CML from the chronic to the acute phase involves frequent aberrations in chromosome 17, to which the p53 oncogene has been mapped. Therefore, we suggest that one of the pathways of development of CML to the acute phase is associated with aberrations in the p53 nuclear oncogene.
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Short, David A., and Francis J. Merceret. "On the Positive Bias of Peak Horizontal Velocity from an Idealized Doppler Profiler." Journal of Atmospheric and Oceanic Technology 22, no. 1 (January 1, 2005): 98–104. http://dx.doi.org/10.1175/jtech-1692.1.
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Abstract In the presence of 3D turbulence, peak horizontal velocity estimates from an idealized Doppler profiler are found to be positively biased due to an incomplete specification of the vertical velocity field. The magnitude of the bias was estimated by assuming that the vertical and horizontal velocities can be separated into average and perturbation values and that the vertical and horizontal velocity perturbations are normally distributed. Under these assumptions, properties of the type-I extreme value distribution for maxima, known as the Gumbel distribution, can be used to obtain an analytical solution of the bias. The bias depends on geometric properties of the profiler configuration, the variance in the horizontal velocity, and the unresolved variance in the vertical velocity. When these variances are normalized by the average horizontal velocity, the bias can be mapped as a simple function of the normalized variances.
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Tang, Xijia, Chao Xu, Tingjin Luo, and Chenping Hou. "Multi-instance positive and unlabeled learning with bi-level embedding." Intelligent Data Analysis 26, no. 3 (April 18, 2022): 659–78. http://dx.doi.org/10.3233/ida-215896.
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Multiple Instance Learning (MIL) is a widely studied learning paradigm which arises from real applications. Existing MIL methods have achieved prominent performances under the premise of plenty annotation data. Nevertheless, sufficient labeled data is often unattainable due to the high labeling cost. For example, the task in web image identification is to find similar samples among a large size of unlabeled dataset through a small number of provided target pictures. This leads to a particular scenario of Multiple Instance Learning with insufficient Positive and superabundant Unlabeled data (PU-MIL), which is a hot research topic in MIL recently. In this paper, we propose a novel method called Multiple Instance Learning with Bi-level Embedding (MILBLE) to tackle PU-MIL problem. Unlike other PU-MIL method using only simple single-level mapping, the bi-level embedding strategy are designed to customize specific mapping for positive and unlabeled data. It ensures the characteristics of key instance are not erased. Moreover, the weighting measure adopted in positive data can extracts the uncontaminated information of true positive instances without interference from negative ones. Finally, we minimize the classification error loss of mapped examples based on class-prior probability to train the optimal classifier. Experimental results show that our method has better performance than other state-of-the-art methods.
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Gherasim, Oana, Roxana Cristina Popescu, Valentina Grumezescu, George Dan Mogoșanu, Laurențiu Mogoantă, Florin Iordache, Alina Maria Holban, et al. "MAPLE Coatings Embedded with Essential Oil-Conjugated Magnetite for Anti-Biofilm Applications." Materials 14, no. 7 (March 25, 2021): 1612. http://dx.doi.org/10.3390/ma14071612.
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The present study reports on the development and evaluation of nanostructured composite coatings of polylactic acid (PLA) embedded with iron oxide nanoparticles (Fe3O4) modified with Eucalyptus (Eucalyptus globulus) essential oil. The co-precipitation method was employed to synthesize the magnetite particles conjugated with Eucalyptus natural antibiotic (Fe3O4@EG), while their composition and microstructure were investigated using grazing incidence X-ray diffraction (GIXRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The matrix-assisted pulsed laser evaporation (MAPLE) technique was further employed to obtain PLA/Fe3O4@EG thin films. Optimal experimental conditions for laser processing were established by complementary infrared microscopy (IRM) and scanning electron microscopy (SEM) investigations. The in vitro biocompatibility with eukaryote cells was proven using mesenchymal stem cells, while the anti-biofilm efficiency of composite PLA/Fe3O4@EG coatings was assessed against Gram-negative and Gram-positive pathogens.
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Kilian, Andrzej, David Kudrna, and Andris Kleinhofs. "Genetic and molecular characterization of barley chromosome telomeres." Genome 42, no. 3 (June 1, 1999): 412–19. http://dx.doi.org/10.1139/g98-142.
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Previously, we cloned telomere-associated sequences using Vectorette-PCR and mapped the most telomeric regions of barley chromosome arms 1S (7HS), 2S (2HS), and 4S (4HS) (Kilian and Kleinhofs 1992). Here we report mapping 33 different telomere-associated markers (21 RFLPs and 12 PCR-based) identifying the most telomeric region of 10 out of the 14 barley chromosome arms. Other telomere-associated markers mapped very close, but not at the telomere, or were interstitial. Four markers mapped at centromeric regions. Two markers, generated by PCR using a single primer based on the sequence of the barley telomere repeats, mapped to the end of barley chromosome 7L (5HL) and internally on chromosome 3L (3HL). Cloning and sequencing of PCR products from the 3L (3HL) interstitial location revealed homology to the HvRT family. Several low copy number sequences physically linked to HvRTs were also cloned and used as RFLP probes. These probes often mapped close to the ends of linkage groups. A few RFLPs mapped at centromeric regions in agreement with the result of in situ hybridization of HvRT clones showing positive signal at the ends and around centromeres of barley chromosomes.Key words: Hordeum vulgare, mapping, telomeres, telomere-associated sequences.
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Rızaoğlu, Tamer, and M. Ziya Karataş. "Fire Behaviors of the Geomaterial-Based Composite Plaster Coated Building Thermal Isolation Plates." Multidisciplinary Aspects of Production Engineering 1, no. 1 (September 1, 2018): 745–50. http://dx.doi.org/10.2478/mape-2018-0094.
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Abstract Thermal insulation in buildings has been a problem for mankind throughout history. New materials have always been used in this context, and every new material has negative aspects such as environmental, economic and engineering. Although the building exterior insulation materials produced in recent years have made significant progress in terms of thermal comfort, but those with superior properties in resistance to fire are very limited. In this study, considering the environmental sensitivity, the plasters produced from the sands of arenitized granite, micaschist, pumice and expanded perlite rocks and their combinations were applied on expanded polystyrene (EPS), extruded polystyrene (XPS) foams and mineral wool for investigating the fire behaviors of each material. As a result of fire tests, it was observed that the most positive values were gained from micaschist based external isolation board, whereas the board obtained from arenitized granite gave the most negative values. With the combination of natural and environmentally friendly materials such as micaschist, perlite and pumice, on a fire resistant insulation material such as mineral wool, a highly fire resistant, environmentally sensitive and economical insulation material can be produced.
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Dzurenda, Ladislav, Michal Dudiak, and Eva Výbohová. "Influence of UV Radiation on the Color Change of the Surface of Steamed Maple Wood with Saturated Water Steam." Polymers 14, no. 1 (January 5, 2022): 217. http://dx.doi.org/10.3390/polym14010217.
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The wood of maple (Acer Pseudopatanus L.) was steamed with a saturated steam-air mixture at a temperature of t = 95 °C or saturated steam at t = 115 °C and t = 135 °C, in order to give a pale pink-brown, pale brown, and brown-red color. Subsequently, samples of unsteamed and steamed maple wood were irradiated with a UV lamp in a Xenotest Q-SUN Xe-3-H after drying, in order to test the color stability of steamed maple wood. The color change of the wood surface was evaluated by means of measured values on the coordinates of the color space CIE L* a* b*. The results show that the surface of unsteamed maple wood changes color markedly under the influence of UV radiation than the surface of steamed maple wood. The greater the darkening and browning color of the maple wood by steaming, the smaller the changes in the values at the coordinates L*, a*, b* of the steamed maple wood caused by UV radiation. The positive effect of steaming on UV resistance is evidenced by the decrease in the overall color difference ∆E*. While the value of the total color diffusion of unsteamed maple wood induced by UV radiation is ∆E* = 18.5, for maple wood steamed with a saturated steam-air mixture at temperature t = 95 °C the ∆E* decreases to 12.6, for steamed maple wood with saturated water steam with temperature t = 115 °C the ∆E* decreases to 10.4, and for saturated water steam with temperature t = 135 °C the ∆E* decreases to 7.2. Differential ATR-FTIR spectra declare the effect of UV radiation on unsteamed and steamed maple wood and confirm the higher color stability of steamed maple wood.
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R., Potůček. "The Sum of Reduced Harmonic Series Generated by Any Number of Positive Integer Factors." EQUATIONS 2 (July 3, 2022): 112–22. http://dx.doi.org/10.37394/232021.2022.2.18.
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This paper is a free continuation of the author’s previous papers dealing with the sums of the reduced harmonic series generated of reciprocals of all products generated by all prime divisors of the numbers 2002 and 2022, that were inspired by one task on the sum of a special infinite series on the Berkeley Math Circle. We determined the sums of these series, i.e. the series of all the unit fractions that have denominators with only factors consisting of all prime divisors of the numbers 2022 and 2002, analytically and also by calculation in computer algebra system Maple. In this paper, we generalize our considerations and derive two formulas that obviously hold not only to series generated by n prime numbers, but also to series generated by n positive integers.
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Kelman, Z., M. Prokocimer, S. Peller, Y. Kahn, G. Rechavi, Y. Manor, A. Cohen, and V. Rotter. "Rearrangements in the p53 gene in Philadelphia chromosome positive chronic myelogenous leukemia [see comments]." Blood 74, no. 7 (November 15, 1989): 2318–24. http://dx.doi.org/10.1182/blood.v74.7.2318.2318.
Full textAbstract:
Abstract Molecular structural analysis of the p53 gene in patients with Philadelphia chromosome-positive chronic myelogenous leukemia (CML) indicates a significant incidence of gene rearrangements in patients at either accelerated phase or blastic crisis. Southern blot analysis of genomic DNA hybridizing with either genomic or cDNA p53 specific probes indicated that 30% of the CML patients at blastic crisis phase exhibited rearrangements, mostly mapping downstream to the first non- coding exon. This is compatible with the observation that the progression of CML from the chronic to the acute phase involves frequent aberrations in chromosome 17, to which the p53 oncogene has been mapped. Therefore, we suggest that one of the pathways of development of CML to the acute phase is associated with aberrations in the p53 nuclear oncogene.
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Tolubyak, Vitalii, Larysa Mosora, Halyna Kis, and Roman Petryshyn. "Migration Processes in a Globalizing Society: Challenges for Donor and Recipient Countries." Multidisciplinary Aspects of Production Engineering 4, no. 1 (September 1, 2021): 408–20. http://dx.doi.org/10.2478/mape-2021-0037.
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Abstract The article examines the influence of migration processes on the formation and development of production capacities of countries. The main functions that perform population migration are indicated. Reasonably, the process of labor migration affects the redistribution of industry types that develop in different countries. The impact of international labor migration on the economies of donor and recipient countries is determined. It has been proven that labor migration has different effects on donor and recipient countries. Researched the question of how the human, social and financial capital of labor migrants can be better used for their counties of origin becomes more and more urgent. There is an opinion that labor migration is not always negative. It is emphasized that educational migration can have a positive impact on the development of industry in the donor country, provided that the population returns home. It is noted that Ukraine often acts as a labor donor for many countries, including Poland. The main spheres of activity in which Ukrainians work abroad are given. The main benefits that donor and recipient countries receive from population migration are identified. It is emphasized that the return flows, ie the return of emigrants home from earnings abroad, change over time the ratio of benefits and losses in the donor country.
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JEDLICKA, JULIE, JOHN VANDERMEER, KATIA AVILES-VAZQUEZ, OTON BARROS, and IVETTE PERFECTO. "Gypsy Moth Defoliation of Oak Trees and a Positive Response of Red Maple and Black Cherry: An Example of Indirect Interaction." American Midland Naturalist 152, no. 2 (October 2004): 231–36. http://dx.doi.org/10.1674/0003-0031(2004)152[0231:gmdoot]2.0.co;2.
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Guo, Dongchuan, Yun Wu, and Heidi B. Kaplan. "Identification and Characterization of Genes Required for Early Myxococcus xanthus Developmental Gene Expression." Journal of Bacteriology 182, no. 16 (August 15, 2000): 4564–71. http://dx.doi.org/10.1128/jb.182.16.4564-4571.2000.
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ABSTRACT Starvation and cell density regulate the developmental expression of Myxococcus xanthus gene 4521. Three classes of mutants allow expression of this developmental gene during growth on nutrient agar, such that colonies of strains containing a Tn5 lac Ω4521 fusion are Lac+. One class of these mutants inactivates SasN, a negative regulator of 4521expression; another class activates SasS, a sensor kinase-positive regulator of 4521 expression; and a third class blocks lipopolysaccharide (LPS) O-antigen biosynthesis. To identify additional positive regulators of 4521 expression, 11 Lac− TnV.AS transposon insertion mutants were isolated from a screen of 18,000 Lac+ LPS O-antigen mutants containing Tn5 lac Ω4521 (Tcr). Ten mutations identified genes that could encode positive regulators of4521 developmental expression based on their ability to abolish 4521 expression during development in the absence of LPS O antigen and in an otherwise wild-type background. Eight of these mutations mapped to the sasB locus, which encodes the known 4521 regulators SasS and SasN. One mapped tosasS, whereas seven identified new genes. Three mutations mapped to a gene encoding an NtrC-like response regulator homologue, designated sasR, and four others mapped to a gene designated sasP. One mutation, designatedssp10, specifically suppressed the LPS O-antigen defect; the ssp10 mutation had no effect on 4521expression in an otherwise wild-type background but reduced4521 developmental expression in the absence of LPS O antigen to a level close to that of the parent strain. All of the mutations except those in sasP conferred defects during growth and development. These data indicate that a number of elements are required for 4521 developmental expression and that most of these are necessary for normal growth and fruiting body development.
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Kosiba, Alexandra M., Paul G. Schaberg, Shelly A. Rayback, and Gary J. Hawley. "Comparative growth trends of five northern hardwood and montane tree species reveal divergent trajectories and response to climate." Canadian Journal of Forest Research 47, no. 6 (June 2017): 743–54. http://dx.doi.org/10.1139/cjfr-2016-0308.
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In the northeastern United States, tree declines associated with acid deposition induced calcium depletion have been documented, notably for red spruce (Picea rubens Sarg.) and sugar maple (Acer saccharum Marsh.). There is conflicting evidence concerning whether co-occurring tree species capitalized on these declines or suffered similar growth reductions and on how growth has fluctuated relative to environmental variables. We examined five species along three elevational transects on Mt. Mansfield, Vermont: sugar maple, red spruce, red maple (Acer rubrum L.), yellow birch (Betula alleghaniensis Britton), and balsam fir (Abies balsamea (L.) Mill.). We found baseline differences in growth. Red maple and yellow birch had the highest growth, sugar maple and red spruce had intermediate growth, and balsam fir had the lowest growth. While some year-to-year declines were associated with specific stress events, protracted patterns such as recent increases in red spruce and red maple growth were correlated with increased temperature and cooling degree days (heat index). For most species and elevations, there was a positive association between temperature and growth but a negative association with growth in the following year. Based on our comparisons, for some species, growth at Mt. Mansfield aligns with regional trends and suggests that patterns assessed here may be indicative of the broader region.
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CLARK, W. EDWIN, and MOURAD E. H. ISMAIL. "INEQUALITIES INVOLVING GAMMA AND PSI FUNCTIONS." Analysis and Applications 01, no. 01 (January 2003): 129–40. http://dx.doi.org/10.1142/s0219530503000041.
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We prove that certain functions involving the gamma and q-gamma function are monotone. We also prove that (xmψ(x))(m+1) is completely monotonic. We conjecture that -(xmψ(m)(x))(m) is completely monotonic for m ≥ 2; and we prove it, with help from Maple, for 2 ≤ m ≤ 16. We give a very useful Maple procedure to verify this for higher values of m. A stronger result is also formulated where we conjecture that the power series coefficients of a certain function are all positive.
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Mitra, Ranjana, Hirendra K. Das, and Aparna Dixit. "Identification of a Positive Transcription Regulatory Element within the Coding Region of the nifLA Operon in Azotobacter vinelandii." Applied and Environmental Microbiology 71, no. 7 (July 2005): 3716–24. http://dx.doi.org/10.1128/aem.71.7.3716-3724.2005.
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ABSTRACT Nitrogen fixation in Azotobacter vinelandii is regulated by the nifLA operon. NifA activates the transcription of nif genes, while NifL antagonizes the transcriptional activator NifA in response to fixed nitrogen and molecular oxygen levels. However, transcriptional regulation of the nifLA operon of A. vinelandii itself is not fully understood. Using the S1 nuclease assay, we mapped the transcription start site of the nifLA operon, showing it to be similar to the σ54-dependent promoters. We also identified a positive cis-acting regulatory element (+134 to +790) of the nifLA operon within the coding region of the nifL gene of A. vinelandii. Deletion of this element results in complete loss of promoter activity. Several protein factors bind to this region, and the specific binding sites have been mapped by DNase I foot printing. Two of these sites, namely dR1 (+134 to +204) and dR2 (+745 to +765), are involved in regulating the nifLA promoter activity. The absence of NtrC-like binding sites in the upstream region of the nifLA operon in A. vinelandii makes the identification of these downstream elements a highly significant finding. The interaction of the promoter with the proteins binding to the dR2 region spanning +745 to +765 appears to be dependent on the face of the helix as introduction of 4 bases just before this region completely disrupts promoter activity. Thus, the positive regulatory element present within the BglII-BglII fragment may play, in part; an important role in nifLA regulation in A. vinelandii.
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Moore, G. W., M. Peyrafitte, C. Dunois, and J. Amiral. "Newly developed dilute Russell’s viper venom reagents for lupus anticoagulant detection with improved specificity." Lupus 27, no. 1 (May 26, 2017): 95–104. http://dx.doi.org/10.1177/0961203317711773.
Full textAbstract:
Background Dilute Russell’s viper venom time (dRVVT) is indispensible in lupus anticoagulant (LA) detection yet commercial reagents from different suppliers perform variably, no gold standard assays exist and therapeutic anticoagulation interference is problematic. Objective The objective of this study was to compare a new formulation dRVVT with two currently available dRVVTs. Materials and methods Life Diagnostics (LD) dRVVT and Stago PTT-LA were routinely used for lupus anticoagulant detection, plus Taipan snake venom time/ecarin time (TSVT/ET) for patients on warfarin or rivaroxaban. Siemens dRVVT and the new HYPHEN BioMed (HBM) dRVVT were tested with 193 patient samples. Group 1, 59 non-anticoagulated patients (NAPs) LA-positive in LD dRVVT; Group 2, 15 PTT-LA-positive/dRVVT-negative NAPs; Group 3, 24 LA-positive warfarinized patients; Group 4, 13 patients on rivaroxaban; Group 5, 62 LA-negative thrombotic NAPs; Group 6, 20 warfarinized, non-antiphospholipid syndrome patients. Results Accepting that the Life Diagnostics reagents were acting as a pseudo-gold standard, Siemens dRVVT detected 56/59, (95%) Group 1 LA and HBM dRVVT 46/59, (76%), one each from Group 2, and Siemens dRVVT detected one in Group 5. The lower HBM dRVVT detection rate mainly concerned weaker LA, where between-reagent concordance is problematic. All Group 3 patients appeared LA-positive in undiluted plasma with Siemens dRVVT, as did 16/24 (67%) with HBM dRVVT but the fewer LA-positives in mixing tests better mapped to clear LA-positives with LD dRVVT. LD and Siemens dRVVTs exhibited 87% and 95% false-positivity for Group 6 whilst HBM dRVVT had none. Increasing the cut-off improved accuracy. Applying higher cut-offs improved accuracy in Group 4 patients. Conclusion HBM dRVVT exhibited improved specificity, mainly due to less interference by anticoagulation, but reduced sensitivity, compared to the other dRVVTs employed.
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Payette, Serge, Marie-Josée Fortin, and Claude Morneau. "The recent sugar maple decline in southern Quebec: probable causes deduced from tree rings." Canadian Journal of Forest Research 26, no. 6 (June 1, 1996): 1069–78. http://dx.doi.org/10.1139/x26-118.
Full textAbstract:
We used tree-ring chronologies from sugar maple (Acersaccharum Marsh.) stands showing various degrees of dieback (i.e., 16 sugar maple chronologies from healthy trees and 11 from damaged trees), distributed throughout the species range in southern Quebec, to analyze the spatial extent and timing of the recent sugar maple decline. Furthermore, six tree-ring chronologies of American beech (Fagusgrandifolia Ehrh.) from six damaged sugar maple stands were used to compare for differential responses associated with factors such as insect defoliation (from the forest tent caterpillar, Malacosomadisstria Hbn., for which American beech is a nonpreferred species), drought, and other climatic events. It was found that several small-scale drought-induced disturbances occurred repetitively over the last 100 years in the western part of the species range in southern Quebec. Most sugar maple chronologies from stands located west, north, and south of Québec City also show extreme narrow tree rings, indicating the incidence of three large and deep growth depressions from the early to mid-1910s, mid-1950s, and early 1980s. The factors explaining the large growth depression of dominant sugar maple of the early 1980s, in the region where the 1980s maple decline was the most severe, are likely associated with the synergistic influence of drought and insect defoliators. The recovery of sugar maple stands from the 1980s growth decline emphasizes the positive responsiveness of the robust native trees to frequent natural disturbances. The 1980s maple decline corresponds to the category of natural disturbances affecting stand dynamics by the combination of events such as drought and insect infestations, and possibly (but to a minor extent) winter thaw-frost, which has yet to be demonstrated, rather than by anthropogenic pollution.