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Modified ultrafiltration

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https://www.readbyqxmd.com/read/28324709/improvement-of-virus-removal-using-ultrafiltration-membranes-modified-with-grafted-zwitterionic-polymer-hydrogels
#1
Ruiqing Lu, Chang Zhang, Maria Piatkovsky, Mathias Ulbricht, Moshe Herzberg, Thanh H Nguyen
Potable water reuse has been adopted by cities suffering water scarcity in recent years. The microbial safety in water reuse, especially with respect to pathogenic viruses, is still a concern for water consumers. Membrane filtration can achieve sufficient removal of pathogenic viruses without disinfection byproducts, but the required energy is intensive. In this study, we graft-polymerized zwitterionic SPP ([3-(methacryloylamino) propyl] dimethyl (3-sulfopropyl) ammonium hydroxide) on a 150 kDa ultrafiltration polyethersulfone membrane to achieve a significantly higher virus removal...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28254281/polysulfone-hemodiafiltration-membranes-with-enhanced-anti-fouling-and-hemocompatibility-modified-by-poly-vinyl-pyrrolidone-via-in-situ-cross-linked-polymerization
#2
Lijing Zhu, Haiming Song, Jiarong Wang, Lixin Xue
Poly(vinyl pyrrolidone) (PVP) and its copolymers have been widely employed for the modification of hemodiafiltration membranes due to their excellent hydrophilicity, antifouling and hemocompatibility. However, challenges still remain to simplify the modification procedure and to improve the utilization efficiency. In this paper, antifouling and hemocompatibility polysulfone (PSf) hemodiafiltration membranes were fabricated via in situ cross-linked polymerization of vinyl pyrrolidone (VP) and vinyltriethoxysilane (VTEOS) in PSf solutions and non-solvent induced phase separation (NIPS) technique...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28216617/eco-friendly-superwetting-material-for-highly-effective-separations-of-oil-water-mixtures-and-oil-in-water-emulsions
#3
Chih-Feng Wang, Sheng-Yi Yang, Shiao-Wei Kuo
Because the treatment of oily wastewater, generated from many industrial processes, has become an increasing environmental concern, the search continues for simple, inexpensive, eco-friendly, and readily scalable processes for fabricating novel materials capable of effective oil/water separation. In this study we prepared an eco-friendly superhydrophilic and underwater superoleophobic polyvinylpyrrolidone (PVP)-modified cotton that mediated extremely efficient separations of mixtures of oil/water and oil/corrosive solutions...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096442/kinetic-modeling-of-incremental-ambulatory-peritoneal-dialysis-exchanges
#4
Steven Guest, John K Leypoldt, Michelle E Cassin, Martin J Schreiber
♦ Background: Incremental peritoneal dialysis (PD), the gradual introduction of dialysate exchanges at less than full-dose therapy, has been infrequently described in clinical reports. One concern with less than full-dose dialysis is whether urea clearance targets are achievable with an incremental regimen. In this report, we used a large database of PD patients, across all membrane transport types, and performed urea kinetic modeling determinations of possible incremental regimens for an individual membrane type...
January 17, 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28078887/electrospun-regenerated-cellulose-nanofiber-membranes-surface-grafted-with-water-insoluble-poly-hema-or-water-soluble-poly-aas-chains-via-the-atrp-method-for-ultrafiltration-of-water
#5
Zhao Wang, Caitlin Crandall, Vicki L Prautzsch, Rajesh Sahadevan, Todd J Menkhaus, Hao Fong
Electrospun nanofiber membranes (ENMs) have demonstrated promising applications for water purification primarily due to high water flux and low degree of fouling. However, the equivalent/apparent pore sizes of as-electrospun ENMs are in microns/submicrons; therefore, the ENMs can only be directly utilized for microfiltration applications. To make regenerated cellulose (RC) ENMs for ultrafiltration applications, atom transfer radical polymerization (ATRP) was studied to graft polymer chains onto the surface of RC nanofibers; specifically, monomers of 2-hydroxyethyl methacrylate (HEMA) and sodium acrylate (AAS) were selected for surface-grafting water-insoluble and water-soluble polymer chains onto RC nanofibers, respectively...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28031170/the-influence-of-sex-on-hyperfiltration-in-patients-with-uncomplicated-type-1-diabetes
#6
Marko Škrtić, Yuliya Lytvyn, Petter Bjornstad, Heather N Reich, James W Scholey, Paul M Yip, Etienne B Sochett, Bruce A Perkins, David Z I Cherney
The aim of this analysis was to examine sex-based differences in renal segmental resistances in healthy controls (HC) and patients with type 1 diabetes (T1D). We hypothesized that hyperfiltration - an early hemodynamic abnormality associated with diabetic nephropathy (DN) - would disproportionately affect women with T1D, thereby attenuating protection against the development of renal complications. Glomerular hemodynamic parameters were evaluated in HC (n=30) and in normotensive, normoalbuminuric patients with T1D and either baseline normofiltration (n=36, T1D-N, glomerular filtration rate [GFR] 90-134 ml/min/1...
December 28, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/27993445/a-possible-water-soluble-inducer-for-synthesis-of-cellulase-in-aspergillus-niger
#7
Jian-Guo Zhang, Qi-Meng Li, Kiran Thakur, Shah Faisal, Zhao-Jun Wei
The synthesis of cellulase in filamentous fungi can be triggered by several inducers. In this study, a bamboo-shoot shell pretreated with Pleurotus ostreatus could promote the formation of cellulases in Aspergillus niger. Further identification, including UPLC-TOF-MS, ultrafiltration, and FT-IR, denoted that the soluble inducer was not a traditional disaccharide but a type of modified lignin polymer. This revelation may result in incipient strategies to ameliorate cellulase productivity.
February 2017: Bioresource Technology
https://www.readbyqxmd.com/read/27935537/predictors-of-residual-renal-function-decline-in-peritoneal-dialysis-patients-the-balanz-trial
#8
Htay Htay, Yeoungjee Cho, Elaine M Pascoe, Darsy Darssan, Carmel M Hawley, David W Johnson
♦ Objective: Preservation of residual renal function (RRF) is associated with improved survival. The aim of the present study was to identify independent predictors of RRF and urine volume (UV) in incident peritoneal dialysis (PD) patients. ♦ Methods: The study included incident PD patients who were balANZ trial participants. The primary and secondary outcomes were RRF and UV, respectively. Both outcomes were analyzed using mixed effects linear regression with demographic data in the first model and PD-related parameters included in a second model...
December 1, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/27837303/prediction-of-fluid-responsiveness-using-pulse-pressure-variation-in-infants-undergoing-ventricular-septal-defect-repair-with-median-sternotomy-or-minimally-invasive-right-thoracotomy
#9
Ding Han, Ya-Guang Liu, Yi Luo, Jia Li, Chuan Ou-Yang
Fluid management is challenging in infants after cardiopulmonary bypass. Pulse pressure variation (PPV) derived from pressure recording analytical method (PRAM) is based on lung-heart interaction during mechanical ventilation. A prospective observational study conducted in operating room tested PPV to predict fluid responsiveness in ventricular septal defect infants. Infants in open chest conditions with median sternotomy (n = 26) or minimally invasive right thoracotomy (n = 29) undergoing ventricular septal defect repair were enrolled...
January 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/27817953/mechanically-assisted-bidirectional-cavopulmonary-shunt-in-neonates-and-infants-an-acute-human-pilot-study
#10
Osami Honjo, Sandra L Merklinger, John B Poe, Anne-Marie Guerguerian, Hargen Zhang, Katherine L Taylor, Glen S Van Arsdell
OBJECTIVE: Poor survival following surgical palliation for hypoplastic left heart syndrome (HLHS) raises the question of the need for a paradigm shift. This is the first human study to investigate the possibility of primary "in-series" palliation in neonates and infants with HLHS in an acute setting with the aid of 2 types of mechanical assist: superior vena cava (SVC)-to-pulmonary artery (PA) pump assist and SVC-to-right atrium (RA) oxygenation assist. METHODS: By rearranging the cannula sites and flow rates for modified ultrafiltration, 2 types of mechanically assisted bidirectional cavopulmonary shunt (BCPS) circulation were simulated for 20 minutes...
February 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/27776242/an-enquiry-on-appropriate-selection-of-polymers-for-preparation-of-polymeric-nanosorbents-and-nanofiltration-ultrafiltration-membranes-for-hormone-micropollutants-removal-from-water-effluents
#11
Milad Asgarpour Khansary, Mostafa Mellat, Seyed Hassan Saadat, Mahdi Fasihi-Ramandi, Mehdi Kamali, Ramezan Ali Taheri
To analyze polymeric nanosorbents and nanofiltration/ultrafiltration membranes for hormone micropollutants removal from water effluents, here an in-through investigation on the suitability and compatibility of various polymers has been carried out. For this work, estradiol, estrone, testosterone, progesterone, estriol, mestranol, and ethinylestradiol were considered. A total number of 452 polymers were analyzed and initially screened using Hansen solubility parameters. The identified good pairs of hormones and polymers then were examined to obtain the equilibrium capacity of hormones removal from water effluents using a modified Flory-Huggins model...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27751877/histamine-type-1-receptor-activation-by-low-dose-of-histamine-undermines-human-glomerular-slit-diaphragm-integrity
#12
Eleonora Veglia, Alessandro Pini, Aldo Moggio, Cristina Grange, Federica Premoselli, Gianluca Miglio, Katerina Tiligada, Roberto Fantozzi, Paul L Chazot, Arianna Carolina Rosa
Histamine has been reported to decrease the ultrafiltration coefficient, which inversely correlates with glomerular permselectivity, however the mechanism(s) underling this effect have never been investigated. This study aimed to assess whether histamine could exert a direct detrimental effect on podocyte permeability and the possible involvement of two key proteins for the glomerular slit diaphragm (SD) integrity, zonula occludens-1 (ZO-1) and P-cadherin. The effect of histamine (100 pM-1000nM) on coloured podocytes junctional integrity was evaluated functionally by a transwell assay of monolayer permeability and morphologically by electron microscopy...
December 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27749035/printing-assisted-surface-modifications-of-patterned-ultrafiltration-membranes
#13
Nathaniel C Wardrip, Melissa Dsouza, Meltem Urgun-Demirtas, Seth W Snyder, Jack A Gilbert, Christopher J Arnusch
Understanding and restricting microbial surface attachment will enhance wastewater treatment with membranes. We report a maskless lithographic patterning technique for the generation of patterned polymer coatings on ultrafiltration membranes. Polyethylene glycol, zwitterionic, or negatively charged hydrophilic polymer compositions in parallel- or perpendicular-striped patterns with respect to feed flow were evaluated using wastewater. Membrane fouling was dependent on the orientation and chemical composition of the coatings...
November 9, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27708001/invited-commentary-on-retrospective-analysis-of-no-longer-performing-modified-ultrafiltration-after-pediatric-cardiopulmonary-bypass
#14
Richard A Jonas
No abstract text is available yet for this article.
October 5, 2016: Perfusion
https://www.readbyqxmd.com/read/27708000/retrospective-analysis-of-eliminating-modified-ultrafiltration-after-pediatric-cardiopulmonary-bypass
#15
Craig M McRobb, Richard J Ing, D Scott Lawson, James Jaggers, Mark Twite
Modified ultrafiltration (MUF) is a technique which is commonly used immediately post-cardiopulmonary bypass (CPB) for open heart surgery in children. There are many advantages of MUF, but there are also a number of less reported disadvantages. At our institution, after considering all of the available data, a decision was made to no longer perform MUF. The primary motivation being the simplified and miniaturized CPB circuit would reduce hemodilution, decrease our likelihood of reaching our transfusion trigger during CPB and, potentially, improve safety...
March 2017: Perfusion
https://www.readbyqxmd.com/read/27685976/improvements-in-permeation-and-fouling-resistance-of-pvc-ultrafiltration-membranes-via-addition-of-tetronic-1107-and-triton-x-100-as-two-non-ionic-and-hydrophilic-surfactants
#16
Hesamoddin Rabiee, S Mojtaba Seyedi, Hossein Rabiei, Negar Alvandifar
Two non-ionic and hydrophilic surfactant additives, Tetronic-1107 and Triton X-100, were added to poly(vinyl chloride)/NMP polymeric solution to prepare ultrafiltration membranes via immersion precipitation. Surfactants at three different weight percentages up to 6 wt% were added, and the fabricated membranes were characterized and their performance for water treatment in the presence of bovine serum albumin (BSA) as a foulant was assessed. The scanning electron microscopy images indicated remarkable changes in morphology due to higher thermodynamic instability after surfactant addition...
September 2016: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/27607307/preparation-and-characterization-of-a-novel-highly-hydrophilic-and-antifouling-polysulfone-nanoporous-tio2-nanocomposite-membrane
#17
H Cheraghi Bidsorkhi, H Riazi, D Emadzadeh, M Ghanbari, T Matsuura, W J Lau, A F Ismail
In this research, novel ultrafiltration nanocomposite membranes were prepared by incorporating self-synthesized nanoporous titanium dioxide (NTiO2) nanoparticles into polysulfone. The surface of the nanoparticle was treated with a silane-based modifier to improve its distribution in the host polymer. Atomic-force microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, transmission electron microscopy, energy-dispersive x-ray spectroscopy, porosity and contact angle tests were conducted to characterize the properties of the particles as well as the fabricated nanocomposite membranes...
October 14, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27597747/anti-bacterial-properties-of-ultrafiltration-membrane-modified-by-graphene-oxide-with-nano-silver-particles
#18
Jingchun Li, Xuyang Liu, Jiaqi Lu, Yudan Wang, Guanglu Li, Fangbo Zhao
To improve the anti-biofouling properties of PVDF membranes, GO-Ag composites were synthesized and used as membrane antibacterial agent by a simple and environmentally friendly method. As identified by XRD, TEM and FTIR analysis, AgNPs were uniformly assembled on the synthesized GO-Ag sheets. The membranes were prepared by phase inversion method with different additional amounts (0.00-0.15wt%) of GO-Ag composites. The GO-Ag composites modified membranes show improved hydrophilicity, mechanical property and permeability than unmodified PVDF membrane...
December 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27532547/a-robust-and-efficient-production-and-purification-procedure-of-recombinant-alzheimers-disease-methionine-modified-amyloid-%C3%AE-peptides
#19
Marie Hoarau, Yannick Malbert, Romain Irague, Christelle Hureau, Peter Faller, Emmanuel Gras, Isabelle André, Magali Remaud-Siméon
An improved production and purification method for Alzheimer's disease related methionine-modified amyloid-β 1-40 and 1-42 peptides is proposed, taking advantage of the formation of inclusion body in Escherichia coli. A Thioflavin-S assay was set-up to evaluate inclusion body formation during growth and optimize culture conditions for amyloid-β peptides production. A simple and fast purification protocol including first the isolation of the inclusion bodies and second, two cycles of high pH denaturation/ neutralization combined with an ultrafiltration step on 30-kDa cut-off membrane was established...
2016: PloS One
https://www.readbyqxmd.com/read/27528270/ultrafiltration-rate-clinical-performance-measures-ready-for-primetime
#20
Jennifer E Flythe
Mounting evidence supports a strong association between fluid management and outcomes among individuals receiving maintenance hemodialysis. The speed of fluid removal during dialysis (ultrafiltration, UF) is a modifiable aspect of fluid management that has attracted recent attention as a potential performance measure for facility fluid management practices. Observational data support an association between higher UF rates and adverse outcomes. This association is supported by the plausible pathophysiologic rationale of hypoperfusion-induced ischemic injury to the heart and other end-organs...
November 2016: Seminars in Dialysis
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