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Journal articles on the topic 'Surface fibrillation'

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Author: Grafiati

Published: 7 July 2024

Last updated: 7 July 2024

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1

Nayak, Arpan, Amit K. Dutta, and Georges Belfort. "Surface-enhanced nucleation of insulin amyloid fibrillation." Biochemical and Biophysical Research Communications 369, no. 2 (May 2008): 303–7. http://dx.doi.org/10.1016/j.bbrc.2008.01.159.

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KEREKES, RICHARD J., DAVID MCDONALD, and FRANK P. MELTZER. "External fibrillation of wood pulp." June 2023 22, no. 6 (July 1, 2023): 363–71. http://dx.doi.org/10.32964/tj22.6.363.

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Pulp refining produces external fibrillation consisting of fibrils tethered to fiber surfaces, in addition to loose fibrils and fines. Both contribute to a larger bonding area that increases paper strength, but tethered fibrils have less likelihood of being washed out during papermaking. This study postulates the mechanism by which refining produces external fibrillation and the optimum conditions for doing so. The postulated mechanism is surface abrasion during sliding of fibers in refiner gaps. External fibrillation occurs when forces are great enough to partially dislodge fibrils from fiber surfaces, but not large enough to break the fibrils. The refining intensities to achieve these forces were determined by a mathematical model and experiments using a laboratory disc refiner. The optimum intensities in terms of specific edge load (SEL) for chemical pulps were about 0.1 J/m for hardwoods and 1.0 J/m for softwoods An extension of this study suggested that abrasion may also account for most of the energy consumed in the mechanical pulping process.

3

Cheung, David L. "Aggregation of an Amyloidogenic Peptide on Gold Surfaces." Biomolecules 13, no. 8 (August 18, 2023): 1261. http://dx.doi.org/10.3390/biom13081261.

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Solid surfaces have been shown to affect the aggregation and assembly of many biomolecular systems. One important example is the formation of protein fibrils, which can occur on a range of biological and synthetic surfaces. The rate of fibrillation depends on both the protein structure and the surface chemistry, with the different molecular and oligomer structures adopted by proteins on surfaces likely to be crucial. In this paper, the aggregation of the model amyloidogenic peptide, Aβ(16–22), corresponding to a hydrophobic segment of the amyloid beta protein on a gold surface is studied using molecular dynamics simulation. Previous simulations of this peptide on gold surfaces have shown that it adopts conformations on surfaces that are quite different from those in bulk solution. These simulations show that this then leads to significant differences in the oligomer structures formed in solution and on gold surfaces. In particular, oligomers formed on the surface are low in beta-strands so are unlike the structures formed in bulk solution. When oligomers formed in solution adsorb onto gold surfaces they can then restructure themselves. This can then help explain the inhibition of Aβ(16–22) fibrillation by gold surfaces and nanoparticles seen experimentally.

4

Wilkes, John. "Effect of Moisture Content on the Morphology of Longitudinal Fracture in Eucalyptus Maculata." IAWA Journal 8, no. 2 (1987): 175–81. http://dx.doi.org/10.1163/22941932-90001044.

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The longitudinal surfaces of Eucalyptus maculata wood sampies fractured either artificially (splitting) or naturally (drying stresses) at a range of moisture contents, were examined under a scanning eleetron microscope. In those sam pies above fibre saturation point, a relativeIy clean surface was produced, since the cells either separated in the outer regions of the wall with minimal fibrillation (fibres, some ray parenchyma), or the fracture path travelled abruptly through the wall exposing the lumen (vertical parenchyma, vessels, so me ray cells). Below fibre saturation, particularly as the air dry condition was approached, a fibrous, splintery surface resulted, due mainly to fibrillation and delamination of the secondary walls in fibres and ray parenchyma.

5

Yamashita, Seigo, Ashok J. Shah, Saagar Mahida, Jean-Marc Sellal, Benjamin Berte, Darren Hooks, Antonio Frontera, et al. "Body Surface Mapping to Guide Atrial Fibrillation Ablation." Arrhythmia & Electrophysiology Review 4, no. 3 (2015): 172. http://dx.doi.org/10.15420/aer.2015.4.3.172.

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Atrial fibrillation (AF) is the most common rhythm disorder, and is strongly associated with thromboembolic events and heart failure. Over the past decade, catheter ablation of AF has advanced considerably with progressive improvement in success rates. However, interventional treatment is still challenging, especially for persistent and long-standing persistent AF. Recently, AF analysis using a non-invasive body surface mapping technique has been shown to identify localised reentrant and focal sources, which play an important role in driving and perpetuating AF. Non-invasive mapping-guided ablation has also been reported to be effective for persistent AF. In this review, we describe new clinical insights obtained from non-invasive mapping of persistent AF to guide catheter ablation.

6

Miyauchi, Yasushi, and Shunsuke Uetake. "Frequency Analysis of Surface ECG in Atrial Fibrillation." Japanese Journal of Electrocardiology 36, no. 2 (2016): 161–66. http://dx.doi.org/10.5105/jse.36.161.

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7

Wang, Xiwen, Jian Hu, and Yun Liang. "Improvement of Surface Wettability and Hydrophilization of Poly-paraphenylene benzobisoxazole Fiber with Fibrillation Combined Oxygen Plasma Treatment." E-Journal of Chemistry 9, no. 3 (2012): 1581–86. http://dx.doi.org/10.1155/2012/730248.

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A new surface modification method fibrillation combined with oxygen plasma treatment to improve the wettability and hydrophily of PBO fiber was studied in this paper. The surface chemical structure and morphology of PBO fiber were characterized by the methods of FTIR, XPS and SEM. The wettability and hydrophlic characters changes on the surface were evaluated by the dynamic contact angle system and image analysis. The results show that the increase surface roughness by fibrillation could improve the wettability. Fibrillation combined oxygen plasma treatment has a better effect than oxygen plasma treatment to improve the wettability and hdyrophlization of PBO fiber. The specific area of PBO fiber increased to 10.7 m2/g from 0.7 m2/g, contact angle decreased to 43.2° from 84.4° and WRV increased to 208.4% from 13.7%. The modified fibers have a good dispersion in water for hydrophilization improvement.

8

Takatsuki, S., H. Mitamura, and S. Ogawa. "Catheter ablation of a monofocal premature ventricular complex triggering idiopathic ventricular fibrillation." Heart 86, no. 1 (July 1, 2001): e3-e3. http://dx.doi.org/10.1136/hrt.86.1.e3.

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A 62 year old man was admitted for evaluation of recurrent episodes of syncope. A surface ECG showed frequent repetitive premature ventricular complexes of right ventricular outflow tract origin. Ventricular fibrillation was inducible by programmed electrical stimulation but otherwise cardiac evaluation was unremarkable. A diagnosis of idiopathic ventricular fibrillation was made and an implantable cardioverter-defibrillator (ICD) was installed. However, spontaneous ventricular fibrillation recurred, requiring repeated ICD discharges. The ventricular fibrillation was reproducibly triggered by a single premature ventricular complex with a specific QRS morphology. Radiofrequency catheter ablation was carried out to eradicate this complex. No ventricular fibrillation has developed after this procedure, and the patient does not require drug treatment.

9

Samyn, Pieter. "Plasma-assisted fibrillation and surface-modification of microfibrillar cellulose." Materials Letters 304 (December 2021): 130615. http://dx.doi.org/10.1016/j.matlet.2021.130615.

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10

Jekova, Irena, Albert Cansell, and Ivan Dotsinsky. "Noise sensitivity of three surface ECG fibrillation detection algorithms." Physiological Measurement 22, no. 2 (March 16, 2001): 287–97. http://dx.doi.org/10.1088/0967-3334/22/2/302.

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11

Khosravi, Zahra, Sumit Sharma, and Amir M. Farnoud. "Submicron polymeric particles accelerate insulin fibrillation by surface adsorption." Biointerphases 14, no. 2 (March 2019): 021001. http://dx.doi.org/10.1116/1.5083821.

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12

Trifirò, S., and L. Ghiadoni. "HEART FAILURE WITH RELAPSING ATRIAL FIBRILLATION: BELOW THE SURFACE." European Heart Journal Supplements 26, Supplement_2 (April 2024): ii83—ii84. http://dx.doi.org/10.1093/eurheartjsupp/suae036.201.

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Abstract Advances in pharmacologic and device therapy have greatly improved prognosis of patients with HFrEF. However, the typical clinical course is still characterized by recurring symptoms, worsening functional status and risk of frequent hospitalizations. A 72–years–old male patient with arterial hypertension, poorly controlled T2DM, TIA and chronic kidney disease presented to Cardiology service in 2018 with dyspnoea on effort and first evidence of EF 35% at echocardiography. He was admitted for elective coronary angiography, which demonstrated limited coronary heart disease of circumflex artery and its first marginal branch, treated by PTCA and stenting. CMR confirmed severe LV dysfunction, but also revealed extensive fibrotic areas with ischaemic and non–ischaemic patterns beyond revascularized regions. With such evidences, HF treatments were intensified, with titration of disease– modifying therapies and DOAC was added for asymptomatic paroxysmal AF. CRT–D was implanted for QRS of 160 msec, which was narrowed to 130 msec. Nevertheless, in one–year time the patient presented worsening of symptoms with several hospital admissions for acute HF and AF with fast rate. A switch to rhythm–control strategy was hence chosen. DCCV was performed, after an initial deferral for thrombosis of LAA due to poor adherence to DOAC. However, three–days after DCCV, the patient presented again to emergency services for dyspnoea, left upper flank pain and AF with fast rate. He was admitted to Acute Medicine Unit and treated with high flow O2, iv Furosemide and Digoxin, analgesics. CT chest and abdomen with contrast was performed in the suspicion of systemic venous thromboembolism for persistent type 1 respiratory failure, raised D–dimer and elevated liver function tests, despite appropriate anticoagulation. CT revealed an unexpected left superior pulmonary vein thrombosis, splenic and small left renal infarcts. The patient was discharged after recovery on subcutaneous heparin. At 15–day review, the patient was in stable conditions and awaiting completion of coagulation screening tests. This case study addresses some important aspects in the care of HF. An accurate assessment of HF aetiology and recurrent triggers, a timely planning of pharmacologic and device treatments, alongside with management of co–morbidities, therapeutic adherence and appropriate anticoagulation, can provide the clinician powerful tools to accomplish the difficult task of managing HF below the surface.

13

Lee, Moon-Hyoung, Zhilin Qu, Gregory A. Fishbein, Scott T. Lamp, Eugene H. Chang, Toshihiko Ohara, Olga Voroshilovsky, et al. "Patterns of wave break during ventricular fibrillation in isolated swine right ventricle." American Journal of Physiology-Heart and Circulatory Physiology 281, no. 1 (July 1, 2001): H253—H265. http://dx.doi.org/10.1152/ajpheart.2001.281.1.h253.

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Several different patterns of wave break have been described by mapping of the tissue surface during fibrillation. However, it is not clear whether these surface patterns are caused by multiple distinct mechanisms or by a single mechanism. To determine the mechanism by which wave breaks are generated during ventricular fibrillation, we conducted optical mapping studies and single cell transmembrane potential recording in six isolated swine right ventricles (RV). Among 763 episodes of wave break (0.75 times · s−1· cm−2), optical maps showed three patterns: 80% due to a wave front encountering the refractory wave back of another wave, 11.5% due to wave fronts passing perpendicular to each other, and 8.5% due to a new (target) wave arising just beyond the refractory tail of a previous wave. Computer simulations of scroll waves in three-dimensional tissue showed that these surface patterns could be attributed to two fundamental mechanisms: head-tail interactions and filament break. We conclude that during sustained ventricular fibrillation in swine RV, surface patterns of wave break are produced by two fundamental mechanisms: head-tail interaction between waves and filament break.

14

Yamazaki, M., D. Filgueiras-Rama, J. Kalifa, and O. Berenfeld. "Surface and Intramural Reentrant Patterns during Atrial Fibrillation in the Sheep." Methods of Information in Medicine 53, no. 04 (2014): 314–19. http://dx.doi.org/10.3414/me13-02-0047.

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SummaryIntroduction: This article is part of the Focus Theme of Methods of Information in Medicine on “Biosignal Interpretation: Advanced Methods for Studying Cardiovascular and Respiratory Systems”.Background: Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia in humans and is predicted to dramatically increase its prevalence in the future. High-resolution mapping data and Fourier power spectral analysis with its dominant frequency support the hypothesis that AF in the structurally normal sheep heart and in some patients often presents organized drivers in the form of periodic surface re-entries or breakthroughs. Nevertheless, the dynamics of those surface patterns of activity, as well as their intramural components are still poorly understood.Objective: To present data on AF waves from the surface of isolated sheep hearts and discuss the interpretation of their intramural patterns.Methods: We used a combination of endocardial-epicardial optical mapping with phase and spectral analysis as well as computer simulation of the re-entrant activity in the myocardial wall.Results: Analysis of the surfaces’ optical mapping data in the phase domain reveals that activation of the posterior left atrium (PLA) consisted of alternating patterns of breakthroughs and reentries. The patterns on the endocardial and epicardial PLA surface at any given moment of time of the AF could be either identical or not identical, and the activity in the thickness of the PLA wall is hypothesized to conform to either ectopic discharge or reentrant scroll waves, but a definite evidence for the presence of such mechanisms is currently lacking. A universal minimal-principle theory is shown in a computer model to result in a tendency of the axis of the scroll waves to align with the myocardial fibers inside the wall.Conclusion: The tendency of filaments of scroll waves to align with myocardial fibers may contribute to the variety and intermittency of surface rotors seen in AF.

15

Kiser, Andy C., Mark D. Landers, Ker Boyce, Matjaž šinkovec, Andrej Pernat, and Borut Geršak. "Simultaneous Catheter and Epicardial Ablations Enable a Comprehensive Atrial Fibrillation Procedure." Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery 6, no. 4 (July 2011): 243–47. http://dx.doi.org/10.1097/imi.0b013e31822ca15c.

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Objective Transmural and contiguous ablations and a comprehensive lesion pattern are difficult to create from the surface of a beating heart but are critical to the successful treatment of persistent, isolated atrial fibrillation. A codisciplinary simultaneous epicardial (surgical) and endocardial (catheter) procedure (Convergent procedure) addresses these issues. Methods Patients with symptomatic atrial fibrillation who failed medical treatment were evaluated. Using only pericardioscopy, the surgeon performed near-complete epicardial isolation of the pulmonary veins and a “box” lesion on the posterior left atrium using unipolar radiofrequency ablation. Simultaneous endocardial catheter radiofrequency ablation completed pulmonary vein isolation, performed a mitral annular and cavotricuspid isthmus line of block, and debulked the coronary sinus. Twelve-month results for the Convergent procedure were compared with 12-month results for concomitant and pericardioscopic (stand-alone transdiaphragmatic/thoracoscopic) atrial fibrillation procedures using unipolar radiofrequency ablation. Results Sixty-five patients underwent the Convergent procedure (mean age, 62 y; mean body surface area, 2.17 m2; mean atrial fibrillation duration, 4.8 y; mean left atrial size, 5.2 cm). Ninety-two percent were in persistent or long-standing persistent atrial fibrillation. At 12 months, evaluation with 24-hour Holter monitors found 82% of patients in sinus rhythm, while only 47% of pericardioscopic and 77% of concomitant patients treated with unipolar radiofrequency ablation were in sinus rhythm. Conclusions Simultaneous epicardial and endocardial ablation improves outcomes for patients with persistent or longstanding persistent atrial fibrillation. This successful collaboration between cardiac surgeon and electrophysiologist is an important treatment option for patients with large left atriums and chronic atrial fibrillation.

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Stavrakis, Stavros, and Sunny Po. "Ganglionated Plexi Ablation: Physiology and Clinical Applications." Arrhythmia & Electrophysiology Review 6, no. 4 (2017): 186. http://dx.doi.org/10.15420/aer2017.26.1.

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Ganglionated plexi (GP), consisting of conglomerations of autonomic ganglia on the epicardial surface of the heart, have been shown to play a significant role in different arrhythmias, including atrial fibrillation. GP ablation has become an adjunctive procedure in the treatment of atrial fibrillation, while it has been used successfully in preliminary studies in vasovagal syncope. This review will present the current data on the physiology and clinical applications of GP ablation in the treatment of atrial fibrillation and other diseases.

17

Zhang, Huijuan, Shihao Lv, Feiyue Ren, Jie Liu, and Jing Wang. "Degree of Hydrolysis Regulated by Enzyme Mediation of Wheat Gluten Fibrillation: Structural Characterization and Analysis of the Mechanism of Action." International Journal of Molecular Sciences 24, no. 17 (August 31, 2023): 13529. http://dx.doi.org/10.3390/ijms241713529.

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The impact of different degrees of hydrolysis (DHs) on fibrillation when trypsin mediates wheat gluten (WG) fibrillation has not been thoroughly investigated. This study discussed the differences in amyloid fibrils (AFs) formed from wheat gluten peptides (WGPs) at various DH values. The results from Thioflavin T (ThT) fluorescence analysis indicated that WGPs with DH6 were able to form the most AFs. Changes in Fourier Transform Infrared (FTIR) absorption spectra and secondary structure also suggested a higher degree of fibrillation in DH6 WGPs. Analysis of surface hydrophobicity and ζ-potential showed that DH6 AFs had the highest surface hydrophobicity and the most stable water solutions. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) images revealed the best overall morphology of DH6 AFs. These findings can offer valuable insights into the development of a standardized method for preparing wheat gluten amyloid fibrils.

18

Nair, Radhika V., Pae Jian Yi, Parasuraman Padmanabhan, Balázs Gulyás, and V. M. Murukeshan. "Au nano-urchins enabled localized surface plasmon resonance sensing of beta amyloid fibrillation." Nanoscale Advances 2, no. 7 (2020): 2693–98. http://dx.doi.org/10.1039/d0na00164c.

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Brändström, Jonas, Jean-Paul Joseleau, Alain Cochaux, Nathalie Giraud-Telme, and Katia Ruel. "Ultrastructure of commercial recycled pulp fibers for the production of packaging paper." Holzforschung 59, no. 6 (November 1, 2005): 675–80. http://dx.doi.org/10.1515/hf.2005.108.

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Abstract Transmission electron microscopy was used to investigate the ultrastructure of recycled pulp fibers originating from a household collection plant and intended for the production of packaging paper. Three recovered paper grades and recycling processes, including pulping, screening, cleaning and refining, were assessed with emphasis on surface and internal fibrillation as well as xylan localization. Results showed a large heterogeneity with respect to fiber ultrastructure within and between the grades. Screening and cleaning steps had no detectable effects, but refining clearly increased cell-wall delamination and surface fibrillation. Immunolabeling of xylans showed that they were distributed rather evenly across the cell walls. They were also present on fines. Two different mechanisms for fiber delamination and surface fibrillation were found, one which implies that internal and external fibrillation take place simultaneously across the cell wall, and another which implies successive peeling of layers or sub-layers from the outside towards the inside. It is suggested that recycled fibers of chemical pulp origin undergo the former mechanism and recycled fibers that contain lignin binding the cell wall matrix give rise to the latter peeling mechanism. Because several recycled fibers were severely delaminated and almost fractured, we suggest that to produce a good packaging paper, it is important that recycled pulp should contain a significant proportion of fibers with high intrinsic strength.

20

Tian, Jing, Yang Yu, Yao Wang, Haoyi Li, Lujuan Yang, Baoan Du, and Gang Ma. "Tannic Acid-Induced Surface-Catalyzed Secondary Nucleation during the Amyloid Fibrillation of Hen Egg-White Lysozyme." International Journal of Molecular Sciences 19, no. 12 (December 12, 2018): 4009. http://dx.doi.org/10.3390/ijms19124009.

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Amyloid fibrillation by hen egg white lysozyme under the influence of tannic acid was investigated by atomic force microscopy and fluorescence spectroscopy. Tannic acid was found to be able to induce the formation of amyloid fibrils with an interesting mixed morphology. Such morphology features with the existence of areas of thickening alternating with areas of normal height. This novel modulation effect of tannic acid on amyloid fibrillation was interpreted by the established surface-catalyzed secondary nucleation theory. We further performed a fluorescence quenching study to investigate the intermolecular interaction between tannic acid and lysozyme. The results support that lysozyme and tannic acid interact with each other mainly through hydrophobic interactions. We also discussed why hydrogen-bonding interaction is not a dominant factor in the interaction between tannic acid and lysozyme though tannic acid contains a significant amount of hydroxyl groups. Our work provides new insight into the effect of tannic acid, a well-known amyloid inhibitor, on amyloid fibrillation.

21

Sudhakar, Swathi, Pandurangan Kalipillai, Poornima Budime Santhosh, and Ethayaraja Mani. "Role of Surface Charge of Inhibitors on Amyloid Beta Fibrillation." Journal of Physical Chemistry C 121, no. 11 (March 15, 2017): 6339–48. http://dx.doi.org/10.1021/acs.jpcc.6b12307.

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Sen, Shubhatam, Swagata Dasgupta, and Sunando DasGupta. "Does Surface Chirality of Gold Nanoparticles Affect Fibrillation of HSA?" Journal of Physical Chemistry C 121, no. 34 (August 17, 2017): 18935–46. http://dx.doi.org/10.1021/acs.jpcc.7b05354.

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23

Nilsson, Frida, Martin Stridh, Andreas Bollmann, and Leif Sörnmo. "Predicting spontaneous termination of atrial fibrillation using the surface ECG." Medical Engineering & Physics 28, no. 8 (October 2006): 802–8. http://dx.doi.org/10.1016/j.medengphy.2005.11.010.

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Roy, O. Z., J. R. Scott, and B. J. Trollope. "60 Hz ventricular fibrillation thresholds for large-surface-area electrodes." Medical & Biological Engineering & Computing 24, no. 5 (September 1986): 471–74. http://dx.doi.org/10.1007/bf02443961.

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Shezad, Khurram, Kejun Zhang, Mubashir Hussain, Hai Dong, Chuanxin He, Xiangjun Gong, Xiaolin Xie, Jintao Zhu, and Lei Shen. "Surface Roughness Modulates Diffusion and Fibrillation of Amyloid-β Peptide." Langmuir 32, no. 32 (August 4, 2016): 8238–44. http://dx.doi.org/10.1021/acs.langmuir.6b01756.

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Jacquemet, Vincent, Mathieu Lemay, Jean-Marc Vesin, Lukas Kappenberger, and Adriaan Van Oosterom. "Dominant frequency of atrial fibrillation estimated from the surface ECG." Heart Rhythm 2, no. 5 (May 2005): S302—S303. http://dx.doi.org/10.1016/j.hrthm.2005.02.953.

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Arasteh, Amir, Mehran Habibi-Rezaei, Azadeh Ebrahim-Habibi, and Ali Akbar Moosavi-Movahedi. "Response Surface Methodology for Optimizing the Bovine Serum Albumin Fibrillation." Protein Journal 31, no. 6 (May 31, 2012): 457–65. http://dx.doi.org/10.1007/s10930-012-9422-9.

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Langley, Philip, and Alan Murray. "Spatial frequency characteristics of body surface potentials during atrial fibrillation." Journal of Electrocardiology 40, no. 4 (July 2007): S31. http://dx.doi.org/10.1016/j.jelectrocard.2007.03.413.

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Alcaraz, R., and J. J. Rieta. "Surface ECG organization analysis to predict paroxysmal atrial fibrillation termination." Computers in Biology and Medicine 39, no. 8 (August 2009): 697–706. http://dx.doi.org/10.1016/j.compbiomed.2009.05.004.

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Grigoriadi, N. E., L. M. Vasilets, A. V. Tuev, E. A. Ratanova, O. V. Khlynova, and A. V. Agafonov. "THE PREDICTION OF ATRIAL FIBRILLATION IN PATIENTS WITH ARTERIAL HYPERTENSION." Annals of the Russian academy of medical sciences 68, no. 11 (November 12, 2013): 26–29. http://dx.doi.org/10.15690/vramn.v68i11.839.

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Aim. To study the parameters of the structural and functional state of the myocardium in patients with hypertension, to determine their prognostic value on the risk of atrial fibrillation (AF). Patients and methods: the study involved 72 people: patients with hypertension and AF, with isolated hypertension and apparently healthy individuals. All of them performed echocardiography, blood pressure monitoring and monitoring of cardiogram. Results: the dilatation of left atrial was founded: patients with the atrial fibrillation on the background of hypertension observed the most pronounced changes in the left atrial. In patients with hypertension without arrhythmias and in combination with atrial fibrillation severe left ventricular hypertrophy was observed. Left ventricle systolic function in groups has been stored but in patients with atrial fibrillation on the background of hypertension was significantly lower. The risk of atrial fibrillation in patients with hypertension prognostic value are the only values of the age, the volume index of the left atrial to the body surface area and left ventricular ejection fraction. Conclusions. The risk of AF in hypertension occurs over the age of 55 and each subsequent year increases it in 1,2 times, it increases with an index value of the left atrial to the body surface over 29 ml/m2 and with a decrease in left ventricular ejection fraction less than 58%.

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Mostovnek, M. V., Z. O. Shokhzodaeva, G. V. Ryabikina, E. V. Shedrina, and V. E. Volkov. "SOME EARLY PREDICTORS OF A RECURRENCE OF FIBRILLATION OF AURICLES IN PATIENTS WHO HAVE UNDERGONE RFA OPERATION." Eurasian heart journal, no. 1 (March 30, 2018): 36–46. http://dx.doi.org/10.38109/2225-1685-2018-1-36-46.

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<strong>The aim of this study</strong> was to identify possible ECG predictors of atrial fibrillation (AF) recurrence in the early period after radiofrequency catheter ablation (RCA). We compare P-waves parameters before and after radiofrequency catheter ablation. In total 12 lead surface ECG of forty-two patients with paroxysmal and persistent atrial fibrillation were analyzed before and after catheter ablation. The 12 lead surface ECG was recorded on sinus rhythm before and within 24-48 h after RCA . 13 patients out of 42 had atrial fibrillation recurrence. Patients with early AF recurrence were significantly older than patients with sinus rhythm. In the group of patients with AF recurrence, the duration of P wave was longer than in the group without AF recurrence. After RCA in both groups there were observed reducing of PQ interval and increasing of heart rate.

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Noszczyk-Nowak, Agnieszka. "P-Wave Dispersion in Prediction of Maintenance of Sinus Rhythm After an Electrical Cardioversion of Atrial Fibrillation in Dogs." Bulletin of the Veterinary Institute in Pulawy 56, no. 1 (March 1, 2012): 99–102. http://dx.doi.org/10.2478/v10213-012-0018-0.

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Abstract The aim of this study was to demonstrate the diagnostic accuracy of P-wave dispersion in predicting recurrence of atrial fibrillation in dogs with sinus rhythm restoration after external cardioversion. The study was performed on 15 dogs, which underwent electrical external cardioversion after atrial fibrillation. Nine-lead surface electrocardiogram of each dog was recorded 1 min after the cardioversion process to measure the P-wave duration. Dogs with recurrent atrial fibrillation had significantly higher P-wave dispersion compared to dogs that had a sinus rhythm lasting more than 3 months (9.26 ±2.01 ms vs 20.9 ±2.18 ms, P=0.001). This study suggests that P-wave dispersion analysis in dogs after a successful external electrical cardioversion has diagnostic accuracy to predict the recurrence of atrial fibrillation.

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Patham, Bhaskar, and M. P. Poornendu Thejaswini. "A Preliminary Investigation of Ductility-Enhancement Mechanism through In Situ Nanofibrillation in Thermoplastic Matrix Composites." Journal of Polymers 2013 (September 9, 2013): 1–9. http://dx.doi.org/10.1155/2013/424015.

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A preliminary investigation of interrelationships between tensile stress-strain characteristics and morphology evolution during deformation is conducted on a commercially available thermoplastic composite with a low-surface-energy nanofibrillating poly(tetrafluoroethylene) (PTFE) additive. In this class of composites, the deformation-associated nanofibrillation of the low-surface-energy additive has been hypothesized to provide an additional dissipation mechanism, thereby enhancing the ductility of the composite. This class of composites offers potential for automotive light weighting in exterior and interior body and fascia applications; it is therefore of interest to investigate processing-structure-property interrelationships in these materials. This study specifically probes the interrelationships between the plastic deformation within the matrix and the fibrillation of the low-surface-energy additive; tensile tests are carried out at two different temperatures which are chosen so as to facilitate and suppress plastic deformation within the matrix polymer. Based on these preliminary investigations, it is noted that PTFE fibrillation acts synergistically with the ductile deformation of the matrix resin resulting in higher strains to failure of the composite; the results also suggest that the mechanism of fibrillation-assisted enhancement of strains to failure may not operate in the absence of matrix plasticity.

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SAITO, YASUKO, NAOYA HONTAMA, YUKI TANAKA, and TAKASHI ENDO. "EFFECT OF FIBRILLATION ON THE ABILITY OF CELLULOSE FIBERS TO SUPPRESS THE AGGREGATION OF QUINACRIDONE." Cellulose Chemistry and Technology 56, no. 7-8 (September 28, 2022): 861–72. http://dx.doi.org/10.35812/cellulosechemtechnol.2022.56.77.

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Quinacridone is a red–violet pigment often used as a coloring agent. However, the aggregation of quinacridone needs to be resolved to avoid undesirable color changes. Cellulose nanofibers are a potential candidate for novel pigment dispersants, due to their ability to inhibit aggregation. In this study, the effect of the degree of fibrillation of cellulose fibers on their performance as dispersants was investigated. Four types of highly fibrillated cellulose particles (HFCPs) were prepared using a disk mill and a high-pressure homogenizer. The degree of fibrillation was evaluated using specific surface area measurements, scanning electron microscopy, and gravitational sedimentation analysis. Fibrillation of cellulose was found to increase its adsorption capacity toward quinacridone. Even partly fibrillated celluloses successfully inhibited the aggregation of quinacridone. Color measurements of the quinacridone–cellulose suspensions indicated that, although fibrillation of cellulose improves the chroma of the suspensions, excess fibrillation causes a decrease in the chroma.

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Gong, Shuai, Jingjing Liu, Mengting Tian, Kang Wang, Shali Cai, Weiyan Wang, and Lei Shen. "Unravelling the mechanism of amyloid-β peptide oligomerization and fibrillation at chiral interfaces." Chemical Communications 55, no. 91 (2019): 13725–28. http://dx.doi.org/10.1039/c9cc06980a.

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Taebnia, Nayere, Dina Morshedi, Mohsen Doostkam, Soheila Yaghmaei, Farhang Aliakbari, Gurvinder Singh, and Ayyoob Arpanaei. "The effect of mesoporous silica nanoparticle surface chemistry and concentration on the α-synuclein fibrillation." RSC Advances 5, no. 75 (2015): 60966–74. http://dx.doi.org/10.1039/c5ra08405a.

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Duan, Yuqing, Shumei Wang, Tingting Xu, Huiyang Bian, and Hongqi Dai. "The Effect of Fibrillation, Semi-Dry Pressing, and Surface Treatment on the Barrier Properties of Water Molecules and Oxygen on Food Packaging Paper." Polymers 16, no. 13 (July 2, 2024): 1892. http://dx.doi.org/10.3390/polym16131892.

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The characteristics of fiber morphology and paper structure are critical to the barrier properties of food packaging paper. Herein, this study aimed to use pulp fibrillation, paper semi-dry pressing and carboxymethyl starch (CMS) coating to flatten the fibers, which were formed on the paper surface with good barrier properties due to the tight bond between fibers. The results showed that the permeability of paper was reduced by 87.56%, from 81.44 μm/Pa·s to 10.13 μm/Pa·s after the pulp fibrillation treatment (60 °SR). Moreover, semi-dry pressing treatment contributed to decreasing the water vapor transmission coefficient (WVP) by 50.98% to 2.74 × 10−10 g/m·s·Pa, and the oxygen permeation coefficient (OP) decreased by 98.04% to 1.93 × 10−14 cm3·cm/cm2·s·Pa. After coating the paper surface with titanium dioxide (TiO2) and CMS, the WVP of the paper was further reduced to 1.55 × 10−10 g/m·s·Pa, and OP was reduced to 0.19 × 10−14 cm3·cm/cm2·s·Pa. These values were 72.27% and 99.8% lower than those of the original paper, respectively. Therefore, through pulp fibrillation, semi-dry pressing of paper, TiO2 filling, and surface coating with CMS, there is no need to use synthetic polymer surface film-forming agents to achieve the high barrier properties that are required for low water and oxygen molecules permeation in food packaging paper.

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Ban, Ji-Eun, Sang-Weon Park, and Young-Hoon Kim. "Radiofrequency catheter ablation of atrial tachyarrhythmias after an atrial switch operation in a patient with univentricular heart combined with transposition of the great arteries." Cardiology in the Young 25, no. 6 (October 2, 2014): 1224–27. http://dx.doi.org/10.1017/s1047951114001851.

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AbstractA 31-year-old patient previously underwent a Mustard operation presented with palpitations. Atrial tachycardia and paroxysmal atrial fibrillation were documented on the surface electrocardiogram. Under the guidance of a three-dimensional electroanatomic mapping system, ablation of the isolated left-sided pulmonary vein and a cavo-tricuspid isthmus-dependent intra-atrial macro re-entry circuit eliminated atrial tachycardia and paroxysmal atrial fibrillation without the recurrence of atrial tachyarrhythmia.

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Abioye, Raliat O., Ogadimma D. Okagu, and Chibuike C. Udenigwe. "Disaggregation of Islet Amyloid Polypeptide Fibrils as a Potential Anti-Fibrillation Mechanism of Tetrapeptide TNGQ." International Journal of Molecular Sciences 23, no. 4 (February 10, 2022): 1972. http://dx.doi.org/10.3390/ijms23041972.

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Islet amyloid polypeptide (IAPP) fibrillation has been commonly associated with the exacerbation of type 2 diabetes prognosis. Consequently, inhibition of IAPP fibrillation to minimize β-cell cytotoxicity is an important approach towards β-cell preservation and type 2 diabetes management. In this study, we identified three tetrapeptides, TNGQ, MANT, and YMSV, that inhibited IAPP fibrillation. Using thioflavin T (ThT) fluorescence assay, circular dichroism (CD) spectroscopy, dynamic light scattering (DLS), and molecular docking, we evaluated the potential anti-fibrillation mechanism of the tetrapeptides. ThT fluorescence kinetics and microscopy as well as transmission electron microscopy showed that TNGQ was the most effective inhibitor based on the absence of normal IAPP fibrillar morphology. CD spectroscopy showed that TNGQ maintained the α-helical conformation of monomeric IAPP, while DLS confirmed the presence of varying fibrillation species. Molecular docking showed that TNGQ and MANT interact with monomeric IAPP mainly by hydrogen bonding and electrostatic interaction, with TNGQ binding at IAPP surface compared to YMSV, which had the highest docking score, but interact mainly through hydrophobic interaction in IAPP core. The highly polar TNGQ was the most active and appeared to inhibit IAPP fibrillation by disaggregation of preformed IAPP fibrils. These findings indicate the potential of TNGQ in the development of peptide-based anti-fibrillation and antidiabetic nutraceuticals.

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Kim, Yunsang, Lauren T. McCoy, Corbin Feit, Shuaib A. Mubarak, Suraj Sharma, and Sergiy Minko. "Carboxymethyl Cellulose Enhanced Production of Cellulose Nanofibrils." Fibers 9, no. 9 (September 13, 2021): 57. http://dx.doi.org/10.3390/fib9090057.

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Cellulose nanofibrils (CNF) were produced by high-pressure homogenization from kraft pulp in the presence of carboxymethyl cellulose (CMC) of varying molecular weights. CNF pretreated with 250 kD CMC exhibited the maximum specific surface area (SSA) of 641 m2/g, which is comparable to that of CNF pretreated by 2,2,6,6-tetramethyl-piperidinyl-1-oxyl (TEMPO)-meditated oxidation with a high degree of fibrillation. Rheological and microscopic analyses also indicated a high level of fibrillation for the CMC-pretreated CNF. In contrast, the reference CNF without the CMC pretreatment showed a lower level of fibrillation, which was reflected in decreased viscosity and the reduction of SSA by a factor of 19. With the high-degree fibrillation and low toxicity, the CMC pretreatment is a promising method for the production of high-quality CNF in an environmentally friendly way.

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Li, Qiao, Chen Jiang, Ge Sheng Yang, Hui Hui Zhang, Min Min Yu, and Hui Li Shao. "Effect of Different Factors on the Fibrillation Degree of Lyocell Fiber Based on Homogenization Treatment." Materials Science Forum 898 (June 2017): 2309–17. http://dx.doi.org/10.4028/www.scientific.net/msf.898.2309.

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The homogenization treatment was performed to fibrillate Lyocell fiber, and then the effects of different factors including NaOH concentration, homogeneous time, temperature and bath ratio on the fibrillation degree of Lyocell fiber were investigated through the orthogonal experiment. Various characterization techniques were employed to compare the fibrillation degree of Lyocell fiber. The polarized light microscope (POM) and scanning electron microscope (SEM) were used to observe the appearance of the fiber after different treatment, and the results showed that it was a quick and efficient approach to obtain the fibrillated Lyocell fiber by homogenization treatment, and the fibrillation degree of fibers varied with different treatment conditions. The results of water retention value (WRV) and the characteristic parameter of the fibrillation degree revealed that the ranking of factors affecting the fibrillation degree of fibers was NaOH concentration > homogeneous time > temperature > bath ratio, using the extreme difference analysis and variance analysis methods. The degree of fibrillation was influenced dominantly by NaOH concentration, rather than any other three factors. By means of BET test, the specific surface area of treated fiber showed a similar trend with WRV, and they matched well with fibril amount on the fibers observed by SEM.

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Yıldız, Banu Şahin, Alparslan Sahin, and Mustafa Yıldız. "P Wave Dispersion Detected from the Surface Electrocardiography and Atrial Fibrillation." Kosuyolu Kalp Dergisi 17, no. 2 (August 6, 2014): 128–30. http://dx.doi.org/10.4274/khj.5244.

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Mak, C. M., C. W. M. Yuen, S. K. A. Ku, and C. W. Kan. "Changes in surface morphology of Tencel fabric during the fibrillation process." Journal of the Textile Institute 97, no. 3 (April 2006): 241–46. http://dx.doi.org/10.1533/joti.2005.0216.

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Husser, Daniela, Martin Stridh, Leif Soemmo, Bertil Olsson, Christoph Geller, Helmut U. Klein, and Andreas Bollmann. "1148-207 Quantification of atrial fibrillation organization from the surface electrocardiogram." Journal of the American College of Cardiology 43, no. 5 (March 2004): A140. http://dx.doi.org/10.1016/s0735-1097(04)90594-3.

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Miao, Menghe, Anthony P. Pierlot, Keith Millington, Stuart G. Gordon, Adrian Best, and Michael Clarke. "Biodegradable mulch fabric by surface fibrillation and entanglement of plant fibers." Textile Research Journal 83, no. 18 (May 10, 2013): 1906–17. http://dx.doi.org/10.1177/0040517513483861.

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46

Tiver, K., D. Dharmaprani, J. Quah, E. Jenkins, D. Campbell, C. Strong, C. Singleton, et al. "Prediction of Correlation Length From the Surface Electrocardiogram in Atrial Fibrillation." Heart, Lung and Circulation 32 (July 2023): S206. http://dx.doi.org/10.1016/j.hlc.2023.06.193.

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Wang, M. D., and M. Cakmak. "Basic Studies on Development of Structure Hierarchy in Tubular Film Blown Dynamically Vulcanized PP/EPDM Blend." Rubber Chemistry and Technology 74, no. 5 (November 1, 2001): 761–78. http://dx.doi.org/10.5254/1.3547652.

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Abstract The processing characteristics and structural hierarchy development in a tubular blown, dynamically vulcanized polypropylene/ethylene—propylene—diene monomer rubber (PP/EPDM) blends were investigated. The semi-crystalline PP phase exhibited a* and c-axis orientations with the a* oriented populations dominating low draw-down ratio (DDR) conditions. At high DDR, both a* and c-axis oriented populations were observed. Little or no preferential orientation was detected in the discrete EPDM phase using dichroism studies. The blown films were found to exhibit an unusual asymmetric structure: The PP phase was found to fibrillate at the outside surface while the inner surface remained relatively featureless. This was attributed to disproportionately rapid cooling of the outside surface by the air stream blown externally onto the film being extruded. This, in turn, resulted in solidification of very thin PP surface layers that caused their fibrillation under the heavy stresses they had to endure. Increasing the blow-up ratio was found to expand this web-like surface texture. As a result of this fibrillation mechanism, the increase of both the blow-up ratio and draw-down ratio was found to reduce the mechanical properties.

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Yang, Q. Q., J. Q. Zhang, Z. Q. Xu, J. C. Jin, L. Yuan, P. Dong, F. L. Jiang, and Y. Liu. "An in-depth kinetics study of chemically modified human serum albumin aggregation and fibrillation." RSC Advances 6, no. 109 (2016): 107591–97. http://dx.doi.org/10.1039/c6ra20303e.

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Liu, Lin, and Guang Li. "The Influence of Milling Parameters on the Fibrillation of PBO Fiber." Advanced Materials Research 482-484 (February 2012): 1894–97. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1894.

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PFI mill was used to prepare PBO fibrils from PBO fiber. With the help of the observation of SEM and the measure of water retention value as well as the analysis of specific surface area, it was found that the milling parameters, including the beating rotation number, beating spacing, beating pressure and beating concentration, influenced the fibrillation of PBO fiber. The processing parameters were studied. The optimal milling conditions were obtained: beating rotation number of 40000-50000r, spacing of 2.4mm, pressure of 4.89N/mm, and concentration of 7.5%. The prepared PBO fibrillar fiber has high specific surface area of 5.001m2/g, while the original PBO fiber has only a specific surface area of 0.476m2/g.

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MAO, JINGLIANG, JOHN F. KADLA, and RICHARD J. KEREKES. "Retaining Surface Fibrillation of Wet-Beaten Wood Pulp in the Dry State." July 2009 8, no. 7 (August 1, 2009): 25–30. http://dx.doi.org/10.32964/tj8.7.25.

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"Air filters produced from surface-fibrillated wood pulp may be a promising new, environmentally friendly means of removing pathogens from air. Such filters combine the attributes of large surface area with large permeability, are produced from a renewable resource, and are disposable by incineration as a carbon-neutral fuel when contaminated. We explored various approaches to producing high-surface fibrillated wood pulp fibers in the dry state and then forming them into high-performance filter pads. Wet beating of the bleached chemical pulp, followed by wet forming and partial freeze-drying to 85% consistency, then air-drying was the best approach. The resulting pads possessed large surface area and produced low pressure drop suitable for high-performance filtering of nano-size particles suspended in air."