keyword
MENU ▼
Read by QxMD icon Read
search

Ultrafiltration

keyword
https://www.readbyqxmd.com/read/28636168/improved-hemodialysis-with-hemocompatible-polyethersulfone-hollow-fiber-membranes-in-vitro-performance
#1
Surendra Kumar Verma, Akshay Modi, Atul Kumar Singh, Rohit Teotia, Jayesh Bellare
We show that addition of nanozeolite (NZ) and vitamin E D-α-Tocopherol polyethylene glycol succinate (TPGS or T) considerably improves the performance of polyethersulfone (PES or P) hollow fiber membrane (HFM) for hemodialysis. Nanocomposite HFMs were manufactured using PES as a polymer, TPGS as an additive and NZ as a filler to give a composite membrane called PT-NZ. HFMs were spun by dry-wet spinning principle based on liquid-liquid phase separation. TPGS and NZ were successfully incorporated in HFMs, as confirmed by EDX elemental mapping...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28634130/the-inhibitory-impacts-of-lactobacillus-rhamnosus-gg-derived-extracellular-vesicles-on-the-growth-of-hepatic-cancer-cells
#2
Elham Behzadi, Hamideh Mahmoodzadeh Hosseini, Abbas Ali Imani Fooladi
Bacterial extracellular vesicles (EVs) have come forth into notice as possible important agent to mediate host-pathogen interactions. In this scientific research, the authors have tried to find out the effect of EVs derived from Lactobacillus rhamnosus GG (LDEVs) on the apoptosis induction in HepG2 cell line. The EVs were purified from the conditioned medium of Lactobacillus rhamnosus GG using ultrafiltration and confirmed by transmission electron microscopy (TEM). The HepG2 cells were treated with different concentrations of purified LDEVs and the cytotoxicity and their effects on the expression of bcl-2 and bax genes were assessed by the MTT assay and semi-quantitative RT-PCR, respectively...
June 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28633134/peritoneal-water-transport-characteristics-of-diabetic-patients-undergoing-peritoneal-dialysis-a-longitudinal-study
#3
Ana Fernandes, Roi Ribera-Sanchez, Ana Rodríguez-Carmona, Antía López-Iglesias, Natacha Leite-Costa, Miguel Pérez Fontán
BACKGROUND: Volume overload is frequent in diabetics undergoing peritoneal dialysis (PD), and may play a significant role in the excess mortality observed in these patients. The characteristics of peritoneal water transport in this population have not been studied sufficiently. METHOD: Following a prospective, single-center design we made cross-sectional and longitudinal comparisons of peritoneal water transport in 2 relatively large samples of diabetic and nondiabetic PD patients...
June 21, 2017: American Journal of Nephrology
https://www.readbyqxmd.com/read/28628875/bioindicator-value-of-flagellates-in-urban-wastewater-treatment-using-membrane-bioreactors
#4
J A Parada-Albarracín, J Pérez, M A Gómez
Two experimental submerged membrane bioreactors (MBR) at the industrial scale with different membranes (microfiltration and ultrafiltration) were used to analyse the influence of the small flagellates on the lack of significance of the sludge biotic index (SBI). Also, with these systems, flagellates were analysed as bioindicators in the activated sludge of MBRs. Both facilities were operated in parallel with a pre-denitrification system for a period of nearly two years and fed with real pretreated urban wastewater...
June 14, 2017: Water Research
https://www.readbyqxmd.com/read/28622926/hominid-visitation-of-the-moravian-karst-during-the-middle-upper-paleolithic-transition-new-results-from-pod-hradem-cave-czech-republic
#5
L Nejman, R Wood, D Wright, L Lisá, Z Nerudová, P Neruda, A Přichystal, J Svoboda
In 1956-1958, excavations of Pod Hradem Cave in Moravia (eastern Czech Republic) revealed evidence for human activity during the Middle-Upper Paleolithic transition. This spanned 25,050-44,800 cal BP and contained artefacts attributed to the Aurignacian and Szeletian cultures, including those made from porcelanite (rarely used at Moravian Paleolithic sites). Coarse grained excavation techniques and major inversions in radiocarbon dates meant that site chronology could not be established adequately. This paper documents re-excavation of Pod Hradem in 2011-2012...
July 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28622565/a-shear-induced-network-of-aligned-wormlike-micelles-in-a-sugar-based-molecular-gel-from-gelation-to-biocompatibility-assays
#6
Juliette Fitremann, Barbara Lonetti, Emiliano Fratini, Isabelle Fabing, Bruno Payré, Christelle Boulé, Isabelle Loubinoux, Laurence Vaysse, Luis Oriol
A new low molecular weight hydrogelator with a saccharide (lactobionic) polar head linked by azide-alkyne click chemistry was prepared in three steps. It was obtained in high purity without chromatography, by phase separation and ultrafiltration of the aqueous gel. Gelation was not obtained reproducibly by conventional heating-cooling cycles and instead was obtained by shearing the aqueous solutions, from 2 wt% to 0.25 wt%. This method of preparation favored the formation of a quite unusual network of interconnected large but thin 2D-sheets (7nm-thick) formed by the association side-by-side of long and aligned 7nm diameter wormlike micelles...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28619128/bioimpedance-based-rather-than-weight-based-ultrafiltration-prescription-for-children-on%C3%A2-maintenance-hemodialysis%C3%A2
#7
Gianluigi Ardissino, Mirco Belingheri, Michela Perrone, Francesca Tel, Dario Consonni, Sara Testa
The determination of dry weight (DW) in young children on hemodialysis (HD) remains challenging. Bioimpedance analysis (BIA) is a potentially helpful means of estimating the need for ultrafiltration and monitoring body fluids in patients on renal replacement therapy, but its role has not yet been clearly defined. The aim of this paper is to share our experience of prescribing ultrafiltration on the basis of BIA parameters alone. The body weight (BW), resistance (Rx), and reactance (Xc) of a 3-year-old girl on chronic HD were recorded pre- and post-HD over a period of 16 months...
June 16, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28617545/fluid-status-of-patients-during-the-early-stages-of-continuous-ambulatory-peritoneal-dialysis
#8
L Wang, W Yu, T Wang
OBJECTIVE: The purpose of this paper is to investigate the fluid status of patients in the early stages of continuous ambulatory peritoneal dialysis (CAPD). PATIENTS AND METHODS: A total of 36 patients (13 males and 23 females), hospitalized in the Nephrology CAPD Center, Peking University Third Hospital, and undergoing intubation and CAPD treatment, were recruited in this study. By utilize a bioelectrical impedance analyzer, changes in extracellular fluid and intracellular fluid within the patients' cells, and overall fluid changes were monitored throughout six months following CAPD treatment...
May 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28614963/watermelon-juice-concentration-using-ultrafiltration-analysis-of-sugar-and-ascorbic-acid
#9
Chiranjit Bhattacharjee, Vinod K Saxena, Suman Dutta
Raw watermelon juice was concentrated in a laboratory-scale flat-plate ultrafiltration system incorporating polyethersulfone membranes with a molecular weight cutoff of 5 kDa. The experiments have been carried out over a wide range of transmembrane pressures (100-300 kPa). The effect of ultrafiltration with molecular weight cutoff of 5 kDa polyethersulfone membrane on concentrate properties is reported. The total soluble solid content of the permeate was found to be very good, while the ascorbic acid content was on the lower side as compared to feed...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28612353/lca-case-study-tertiary-treatment-process-options-for-wastewater-reuse
#10
Erwan Carré, Joana Beigbeder, Vincent Jauzein, Guillaume Junqua, Miguel Lopez-Ferber
Tertiary treatment process (including filtration and/or disinfection) is necessary to obtain a water quality suited for high-quality reuse from wastewater treatment. Industrial pilots representing small real size treatment units were set up downstream of a conventional secondary treatment of a wastewater treatment plant in the South of France and their performance followed for two years. Life-cycle assessment (LCA) methodology is used to compare the environmental impacts of different treatment processes. Five tertiary treatment trains were studied: 1) sand filtration + storage followed by ultraviolet (UV) dynamic reactor disinfection (SF-UVD), 2) sand filtration (SF) + UV batch reactor disinfection (SF-UVB), 3) ultrafiltration (UF), 4) ultrafiltration and UV batch reactor disinfection (UF-UVB), 5) microfiltration (MF) and storage followed by dynamic UV disinfection (MF-UVD)...
June 13, 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28609730/virus-removal-by-ultrafiltration-understanding-long-term-performance-change-by-application-of-bayesian-analysis
#11
Guido Carvajal, Amos Branch, Scott A Sisson, David J Roser, Ben van den Akker, Paul Monis, Petra Reeve, Alexandra Keegan, Rudi Regel, Stuart J Khan
Ultrafiltration is an effective barrier to waterborne pathogens including viruses. Challenge testing is commonly used to test the inherent reliability of such systems. Performance validation seeks to demonstrate the adequate reliability of the treatment system. Appropriate and rigorous data analysis is an essential aspect of validation testing. In this study we used Bayesian analysis to assess the performance of a full-scale ultrafiltration system which was validated and revalidated after five years of operation...
May 30, 2017: Water Research
https://www.readbyqxmd.com/read/28602685/isolation-and-characterization-of-antimicrobial-peptides-derived-from-bacillus-subtilis-e20-fermented-soybean-meal-and-its-use-for-preventing-vibrio-infection-in-shrimp-aquaculture
#12
Ann-Chang Cheng, Hsueh-Li Lin, Ya-Li Shiu, Yu-Chang Tyan, Chun-Hung Liu
Bacillus subtilis E20-fermented soybean meal (FSBM) was found to produce antimicrobial peptides (AMPs) with great antimicrobial activity against Vibrio alginolyticus (VA) and V. parahaemolyticus (VP). Three AMPs were purified with a 5 kDa ultrafiltration, Sephadex G-15 column and reverse-phase high-performance liquid chromatography (RP-HPLC). The FSB-AMP, HTSKALLDMLKRLGK, identified by an RP-nano-ultrapure liquid chromatography (UPLC) electrospray ionization (ESI)-tandem mass spectroscopic (MS/MS) analysis exhibited the highest bactericidal activity against VA and VP compared to the others...
June 5, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28601743/highly-antifouling-and-antibacterial-performance-of-poly-vinylidene-fluoride-ultrafiltration-membranes-blending-with-copper-oxide-and-graphene-oxide-nanofillers-for-effective-wastewater-treatment
#13
Chuanqi Zhao, Jinling Lv, Xiaochen Xu, Guoquan Zhang, Yuesuo Yang, Fenglin Yang
Innovation and effective wastewater treatment technology is still in great demand given the emerging contaminants frequently spotted from the aqueous environment. By blending with poly (vinylidene fluoride) (PVDF), the strong hydrophilic graphene oxide (GO) and antibacterial copper oxide (CuxO) were used as nanofillers to develop the novel, highly antifouling composite membranes via phase inversion process in our latest work. The existence and dispersion of GO and CuxO posed a significant role on morphologies, structures, surface composition and hydrophilicity of the developed composite membranes, confirmed by SEM, TEM, FTIR and XPS in depth characterization...
May 25, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28598338/polysulfone-ultrafiltration-membrane-incorporated-with-ag-sio2-nanohybrid-for-effective-fouling-control
#14
Huiqing Wu, Jing Huang, Yuejun Liu
An anti-fouling hybrid membrane was prepared by incorporating Ag-SiO2 nanohybrid into a polysulfone (PSf) matrix. The addition of Ag-SiO2 can significantly improve the hydrophilicity, separation property, anti-fouling ability, and especially anti-bacterial activity of hybrid membranes. The optimum performance of the Ag-SiO2/PSf hybrid membrane is achieved when the concentration of Ag-SiO2 is as low as 0.45 wt%. Compared with PSf membrane and SiO2/PSf hybrid membrane, the Ag-SiO2/PSf hybrid membrane displays the best overall properties...
June 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/28597798/ultrafiltration-versus-intravenous-loop-diuretics-in-patients-with-acute-decompensated-heart-failure-a-meta-analysis-of-clinical-trials
#15
Mohamad Kabach, Hassan Alkhawam, Sachil Shah, Georges Joseph, Elie M Donath, Noah Moss, Robert S Rosenstein, Robert Chait
Background Intravenous loop diuretics are the first-line therapy for acute decompensated heart failure (ADHF) but many patients are discharged with unresolved congestion resulting in higher re-hospitalization and mortality rates. Ultrafiltration (UF) is a promising intervention for ADHF. However, studies comparing UF to diuretics have been inconsistent in their clinical outcomes. Methods A comprehensive literature search was performed. Trials were included if they met the following criteria: (1) randomization with a control group, (2) comparison of UF with a loop diuretic, and (3) a diagnosis of ADHF...
April 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28595153/preparation-and-characteristics-of-graphene-oxide-blending-pvdf-nanohybrid-membranes-and-their-applications-for-hazardous-dye-adsorption-and-rejection
#16
Zhenya Zhu, Lei Wang, Yawei Xu, Qingqing Li, Jialiang Jiang, Xudong Wang
Graphene oxide (GO) and lithium chloride (LiCl) were introduced into poly (vinylidene fluoride) (PVDF) membranes prepared using the immersion precipitation technique. The hydrophilicity, water flux, X-ray diffraction (XRD), zeta potential, SEM and AFM images of membranes were investigated. By adjusting the content of GO from 0wt% to 0.9 wt%, the water flux of PVDF/GO/LiCl nanohybrid membranes varied from 48.4L/m(2)h to 61.90L/m(2)h at 100kPa. Because of the synergistic effects of GO and LiCl particles, the surface free energy (|ΔGs|) of M3 (0...
May 23, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28594559/anion-exchange-on-cationic-surfactant-micelles-and-a-speciation-model-for-estimating-anion-removal-on-micelles-during-ultrafiltration-of-water
#17
Ming Chen, Chad T Jafvert
Surfactant micelles combined with ultrafiltration can partially, or sometimes nearly completely, separate various ionic and nonionic pollutants from water. To this end, the selectivity of aqueous micelles composed of either cetyltrimethylammonium (CTA(+)) bromide or cetylpyridinium (CP(+)) chloride towards many environmentally relevant anions (IO3(-), F(-), Cl(-), HCO3(-), NO2(-), Br(-), NO3(-), H2PO4(-), HPO4(2-), SO4(2-), and CrO4(2-)) was investigated. Selectivity coefficients of CTA(+) micelles (with respect to Br(-)) and CP(+) micelle (with respect to Cl(-)) for these anions were evaluated using a simple thermodynamic ion exchange model...
June 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28594542/development-of-hybrid-ultrafiltration-membranes-with-improved-water-separation-properties-using-modified-superhydrophilic-metal-organic-framework-nanoparticles
#18
Huazhen Sun, Beibei Tang, Peiyi Wu
Metal-organic frameworks (MOFs) are being intensively explored as filler materials for polymeric membranes primarily due to their high polymer affinity, large pore volumes, and alterable pore functionalities, but the development of MOF-based ultrafiltration (UF) membranes for water treatment lags behind. Herein, poly(sulfobetaine methacrylate) (PSBMA)-functionalized MOF UiO-66-PSBMA was developed, and incorporated into polysulfone (PSf) casting solution to fabricate novel hybrid UF membranes via phase-inversion method...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28590110/modeling-and-optimization-of-nldh-pvdf-ultrafiltration-nanocomposite-membrane-using-artificial-neural-network-genetic-algorithm-hybrid
#19
Samira Arefi-Oskoui, Alireza Khataee, Vahid Vatanpour
In this research, MgAl-CO32- nanolayered double hydroxide (NLDH) was synthesized through a facile co-precipitation method followed by a hydrothermal treatment. The prepared NLDHs were used as a hydrophilic nanofiller for improving the performance of the PVDF-based ultrafiltration membranes. The main objective of this research was to obtain the optimized formula of NLDH/PVDF nanocomposite membrane presenting the best performance using computational techniques as a cost-effective method. For this aim, an artificial neural network (ANN) model was developed for modeling and expressing the relationship between the performance of the nanocomposite (pure water flux, protein flux and flux recovery ratio) and the affecting parameters including the NLDH, PVP 29000 and polymer concentrations...
June 7, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28589281/preparation-and-characterization-of-glass-hollow-fiber-membrane-for-water-purification-applications
#20
Siti Nurfatin Nadhirah Mohd Makhtar, Mukhlis A Rahman, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Juhana Jaafar
This work discusses the preparation and characterizations of glass hollow fiber membranes prepared using zeolite-5A as a starting material. Zeolite was formed into a hollow fiber configuration using the phase inversion technique. It was later sintered at high temperatures to burn off organic materials and change the zeolite into glass membrane. A preliminary study, that used thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared (FTIR), confirmed that zeolite used in this study changed to glass at temperatures above 1000 °C...
June 6, 2017: Environmental Science and Pollution Research International
keyword
keyword
10825
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"