journal
MENU ▼
Read by QxMD icon Read
search

Membranes

journal
https://www.readbyqxmd.com/read/28467384/anaerobic-membrane-bioreactor-for-continuous-lactic-acid-fermentation
#1
Rong Fan, Mehrdad Ebrahimi, Peter Czermak
Membrane bioreactor systems can enhance anaerobic lactic acid fermentation by reducing product inhibition, thus increasing productivity. In batch fermentations, the bioconversion of glucose is strongly inhibited in the presence of more than 100 g·L(-1) lactic acid and is only possible when the product is simultaneously removed, which can be achieved by ceramic membrane filtration. The crossflow velocity is a more important determinant of flux than the transmembrane pressure. Therefore, to stabilize the performance of the membrane bioreactor system during continuous fermentation, the crossflow velocity was controlled by varying the biomass concentration, which was monitored in real-time using an optical sensor...
May 3, 2017: Membranes
https://www.readbyqxmd.com/read/28468242/polymer-electrolyte-membranes-for-water-photo-electrolysis
#2
Antonino S Aricò, Mariarita Girolamo, Stefania Siracusano, David Sebastian, Vincenzo Baglio, Michael Schuster
Water-fed photo-electrolysis cells equipped with perfluorosulfonic acid (Nafion(®) 115) and quaternary ammonium-based (Fumatech(®) FAA3) ion exchange membranes as separator for hydrogen and oxygen evolution reactions were investigated. Protonic or anionic ionomer dispersions were deposited on the electrodes to extend the interface with the electrolyte. The photo-anode consisted of a large band-gap Ti-oxide semiconductor. The effect of membrane characteristics on the photo-electrochemical conversion of solar energy was investigated for photo-voltage-driven electrolysis cells...
April 29, 2017: Membranes
https://www.readbyqxmd.com/read/28448443/the-effect-of-thermal-fluctuation-on-the-receptor-mediated-adhesion-of-a-cell-membrane-to-an-elastic-substrate
#3
Bahador Marzban, Hongyan Yuan
Mechanics of the bilayer membrane play an important role in many biological and bioengineering problems such as cell-substrate and cell-nanomaterial interactions. In this work, we study the effect of thermal fluctuation and the substrate elasticity on the cell membrane-substrate adhesion. We model the adhesion of a fluctuating membrane on an elastic substrate as a two-step reaction comprised of the out-of-plane membrane fluctuation and the receptor-ligand binding. The equilibrium closed bond ratio as a function of substrate rigidity was computed by developing a coupled Fourier space Brownian dynamics and Monte Carlo method...
April 27, 2017: Membranes
https://www.readbyqxmd.com/read/28406468/foulant-analysis-of-three-ro-membranes-used-in-treating-simulated-brackish-water-of-the-iraqi-marshes
#4
Dawood Eisa Sachit, John N Veenstra
In this work, three different types of Reverse Osmosis (RO) (Thin-Film Composite (SE), Cellulose Acetate (CE), and Polyamide (AD)) were used to perform foulant analysis (autopsy) study on the deposited materials from three different simulated brackish surface feed waters. The brackish surface water qualities represented the water quality in Iraqi marshes. The main foulants from the simulated feed waters were characterized by using Scanning Electron Microscope (SEM) images and Energy-Dispersive X-ray Spectroscopy (EDXS) spectra...
April 13, 2017: Membranes
https://www.readbyqxmd.com/read/28387711/descriptive-analysis-of-lap1-distribution-and-that-of-associated-proteins-throughout-spermatogenesis
#5
Joana B Serrano, Filipa Martins, João C Sousa, Cátia D Pereira, Ans M M van Pelt, Sandra Rebelo, Odete A B da Cruz E Silva
Spermatogenesis comprises highly complex differentiation processes. Nuclear envelope (NE) proteins have been associated with these processes, including lamins, lamina-associated polypeptide (LAP) 2 and the lamin B-receptor. LAP1 is an important NE protein whose function has not been fully elucidated, but several binding partners allow predicting putative LAP1 functions. To date, LAP1 had not been associated with spermatogenesis. In this study, LAP1 expression and cellular/subcellular localization during spermatogenesis in human and mouse testes is established for the first time...
April 7, 2017: Membranes
https://www.readbyqxmd.com/read/28379173/effects-of-phase-separation-behavior-on-morphology-and-performance-of-polycarbonate-membranes
#6
Alamin Idris, Zakaria Man, Abdulhalim S Maulud, Muhammad Saad Khan
The phase separation behavior of bisphenol-A-polycarbonate (PC), dissolved in N-methyl-2-pyrrolidone and dichloromethane solvents in coagulant water, was studied by the cloud point method. The respective cloud point data were determined by titration against water at room temperature and the characteristic binodal curves for the ternary systems were plotted. Further, the physical properties such as viscosity, refractive index, and density of the solution were measured. The critical polymer concentrations were determined from the viscosity measurements...
April 5, 2017: Membranes
https://www.readbyqxmd.com/read/28350320/performance-of-hybrid-photocatalytic-ceramic-membrane-system-for-the-treatment-of-secondary-effluent
#7
Lili Song, Bo Zhu, Stephen Gray, Mikel Duke, Shobha Muthukumaran
Evaluation of an advanced wastewater treatment system that combines photocatalysis with ceramic membrane filtration for the treatment of secondary effluent was undertaken. The results showed that, after photocatalysis and ceramic membrane filtration, the removal of dissolved organic carbon and UV254 was 60% and 54%, respectively, at a concentration of 4 g/L of TiO₂. Dissolved organic matter (DOM) present in the secondary effluent was characterised with a liquid chromatography-organic carbon detector (LC-OCD) technique...
March 28, 2017: Membranes
https://www.readbyqxmd.com/read/28346335/apparent-interfacial-tension-effects-in-protein-stabilized-emulsions-prepared-with-microstructured-systems
#8
Carme Güell, Montserrat Ferrando, Alexandre Trentin, Karin Schroën
Proteins are mostly used to stabilize food emulsions; however, production of protein containing emulsions is notoriously difficult to capture in scaling relations due to the complex behavior of proteins in interfaces, in combination with the dynamic nature of the emulsification process. Here, we investigate premix membrane emulsification and use the Ohnesorge number to derive a scaling relation for emulsions prepared with whey protein, bovine serum albumin (BSA), and a standard emulsifier Tween 20, at various concentrations (0...
March 25, 2017: Membranes
https://www.readbyqxmd.com/read/28333121/glycerol-production-and-transformation-a-critical-review-with-particular-emphasis-on-glycerol-reforming-reaction-for-producing-hydrogen-in-conventional-and-membrane-reactors
#9
REVIEW
Giuseppe Bagnato, Adolfo Iulianelli, Aimaro Sanna, Angelo Basile
Glycerol represents an emerging renewable bio-derived feedstock, which could be used as a source for producing hydrogen through steam reforming reaction. In this review, the state-of-the-art about glycerol production processes is reviewed, with particular focus on glycerol reforming reactions and on the main catalysts under development. Furthermore, the use of membrane catalytic reactors instead of conventional reactors for steam reforming is discussed. Finally, the review describes the utilization of the Pd-based membrane reactor technology, pointing out the ability of these alternative fuel processors to simultaneously extract high purity hydrogen and enhance the whole performances of the reaction system in terms of glycerol conversion and hydrogen yield...
March 23, 2017: Membranes
https://www.readbyqxmd.com/read/28333092/impact-of-coagulant-and-flocculant-addition-to-an-anaerobic-dynamic-membrane-bioreactor-andmbr-treating-waste-activated-sludge
#10
Guido Kooijman, Wilton Lopes, Zhongbo Zhou, Hongxiao Guo, Merle de Kreuk, Henri Spanjers, Jules van Lier
In this work, we investigated the effects of flocculation aid (FA) addition to an anaerobic dynamic membrane bioreactor (AnDMBR) (7 L, 35 °C) treating waste-activated sludge (WAS). The experiment consisted of three distinct periods. In period 1 (day 1-86), the reactor was operated as a conventional anaerobic digester with a solids retention time (SRT) and hydraulic retention time (HRT) of 24 days. In period 2 (day 86-303), the HRT was lowered to 18 days with the application of a dynamic membrane while the SRT was kept the same...
March 23, 2017: Membranes
https://www.readbyqxmd.com/read/28335452/fabrication-and-water-treatment-application-of-carbon-nanotubes-cnts-based-composite-membranes-a-review
#11
REVIEW
Lining Ma, Xinfa Dong, Mingliang Chen, Li Zhu, Chaoxian Wang, Fenglin Yang, Yingchao Dong
Membrane separation technology is widely explored for various applications, such as water desalination and wastewater treatment, which can alleviate the global issue of fresh water scarcity. Specifically, carbon nanotubes (CNTs)-based composite membranes are increasingly of interest due to the combined merits of CNTs and membrane separation, offering enhanced membrane properties. This article first briefly discusses fabrication and growth mechanisms, characterization and functionalization techniques of CNTs, and then reviews the fabrication methods for CNTs-based composite membranes in detail...
March 18, 2017: Membranes
https://www.readbyqxmd.com/read/28294967/single-lipid-molecule-dynamics-on-supported-lipid-bilayers-with-membrane-curvature
#12
Philip P Cheney, Alan W Weisgerber, Alec M Feuerbach, Michelle K Knowles
The plasma membrane is a highly compartmentalized, dynamic material and this organization is essential for a wide variety of cellular processes. Nanoscale domains allow proteins to organize for cell signaling, endo- and exocytosis, and other essential processes. Even in the absence of proteins, lipids have the ability to organize into domains as a result of a variety of chemical and physical interactions. One feature of membranes that affects lipid domain formation is membrane curvature. To directly test the role of curvature in lipid sorting, we measured the accumulation of two similar lipids, 1,2-Dihexadecanoyl-sn-glycero-3-phosphoethanolamine (DHPE) and hexadecanoic acid (HDA), using a supported lipid bilayer that was assembled over a nanopatterned surface to obtain regions of membrane curvature...
March 15, 2017: Membranes
https://www.readbyqxmd.com/read/28272296/performance-of-carbon-nanotube-polysulfone-cnt-psf-composite-membranes-during-oil-water-mixture-separation-effect-of-cnt-dispersion-method
#13
Michael Olawale Daramola, Palesa Hlanyane, Oluwafolakemi O Sadare, Olugbenga O Oluwasina, Sunny E Iyuke
Effect of the dispersion method employed during the synthesis of carbon nanotube (CNT)/polysulfone-infused composite membranes on the quality and separation performance of the membranes during oil-water mixture separation is demonstrated. Carbon nanotube/polysulfone composite membranes containing 5% CNT and pure polysulfone membrane (with 0% CNT) were synthesized using phase inversion. Three CNT dispersion methods referred to as Method 1 (M1), Method 2 (M2), and Method 3 (M3) were used to disperse the CNTs...
March 6, 2017: Membranes
https://www.readbyqxmd.com/read/28273869/membranes-with-surface-enhanced-antifouling-properties-for-water-purification
#14
REVIEW
Nima Shahkaramipour, Thien N Tran, Sankara Ramanan, Haiqing Lin
Membrane technology has emerged as an attractive approach for water purification, while mitigation of fouling is key to lower membrane operating costs. This article reviews various materials with antifouling properties that can be coated or grafted onto the membrane surface to improve the antifouling properties of the membranes and thus, retain high water permeance. These materials can be separated into three categories, hydrophilic materials, such as poly(ethylene glycol), polydopamine and zwitterions, hydrophobic materials, such as fluoropolymers, and amphiphilic materials...
March 5, 2017: Membranes
https://www.readbyqxmd.com/read/28264453/assessment-of-a-new-silicon-carbide-tubular-honeycomb-membrane-for-treatment-of-olive-mill-wastewaters
#15
Maria C Fraga, Sandra Sanches, João G Crespo, Vanessa J Pereira
Extremely high removals of total suspended solids and oil and grease were obtained when olive mill wastewaters were filtered using new silicon carbide tubular membranes. These new membranes were used at constant permeate flux to treat real olive mill wastewaters at pilot scale. The filtration conditions were evaluated and optimized in terms of the selection of the permeate flux and flux maintenance strategies employed-backpulsing and backwashing-in order to reduce fouling formation. The results obtained reveal that the combination of backpulses and backwashes helps to maintain the permeate flux, avoids transmembrane pressure increase and decreases the cake resistance...
February 27, 2017: Membranes
https://www.readbyqxmd.com/read/28241433/fogging-control-on-ldpe-eva-coextruded-films-wettability-behavior-and-its-correlation-with-electric-performance
#16
Miguel A Waldo-Mendoza, Zoe V Quiñones-Jurado, Juan C Pérez-Medina, Bernardo Yañez-Soto, Pedro E Ramírez-González
The transformation of fog at a non-visible water layer on a membrane of low-density polyethylene (LDPE) and ethylene-vinyl acetate (EVA) was evaluated. Nonionic surfactants of major demand in the polyolefin industry were studied. A kinetic study using a hot fog chamber showed that condensation is controlled by both the diffusion and permanency of the surfactant more than by the change of the surface energy developed by the wetting agents. The greatest permanency of the anti-fog effect of the LDPE/EVA surface was close to 3000 h...
February 22, 2017: Membranes
https://www.readbyqxmd.com/read/28218648/expression-purification-and-monitoring-of-conformational-changes-of-hcb2-tmh67h8-in-different-membrane-mimetic-lipid-mixtures-using-circular-dichroism-and-nmr-techniques
#17
Elvis K Tiburu, Jianqin Zhuang, Heidimarie N A Fleischer, Patrick K Arthur, Gordon A Awandare
This work was intended to develop self-assembly lipids for incorporating G-protein coupled receptors (GPCRs) in order to improve the success rate for nuclear magnetic resonance spectroscopy (NMR) structural elucidation. We hereby report the expression and purification of uniformly (15)N-labeled human cannabinoid receptor-2 domain in insect cell media. The domain was refolded by screening several membrane mimetic environments. Different q ratios of isotropic bicelles were screened for solubilizing transmembrane helix 6, 7 and 8 (TMH67H8)...
February 17, 2017: Membranes
https://www.readbyqxmd.com/read/28218644/review-of-membranes-for-helium-separation-and-purification
#18
REVIEW
Colin A Scholes, Ujjal K Ghosh
Membrane gas separation has potential for the recovery and purification of helium, because the majority of membranes have selectivity for helium. This review reports on the current state of the research and patent literature for membranes undertaking helium separation. This includes direct recovery from natural gas, as an ancillary stage in natural gas processing, as well as niche applications where helium recycling has potential. A review of the available polymeric and inorganic membranes for helium separation is provided...
February 17, 2017: Membranes
https://www.readbyqxmd.com/read/28208685/hollow-fiber-supported-liquid-membrane-extraction-combined-with-hplc-uv-for-simultaneous-preconcentration-and-determination-of-urinary-hippuric-acid-and-mandelic-acid
#19
Abdulrahman Bahrami, Farhad Ghamari, Yadollah Yamini, Farshid Ghorbani Shahna, Abbas Moghimbeigi
This work describes a new extraction method with hollow-fiber liquid-phase microextraction based on facilitated pH gradient transport for analyzing hippuric acid and mandelic acid in aqueous samples. The factors affecting the metabolites extraction were optimized as follows: the volume of sample solution was 10 mL with pH 2 containing 0.5 mol·L(-1) sodium chloride, liquid membrane containing 1-octanol with 20% (w/v) tributyl phosphate as the carrier, the time of extraction was 150 min, and stirring rate was 500 rpm...
February 12, 2017: Membranes
https://www.readbyqxmd.com/read/28208658/synthesis-and-transport-properties-of-novel-mof-pim-1-mof-sandwich-membranes-for-gas-separation
#20
Alessio Fuoco, Muhanned R Khdhayyer, Martin P Attfield, Elisa Esposito, Johannes C Jansen, Peter M Budd
Metal-organic frameworks (MOFs) were supported on polymer membrane substrates for the fabrication of composite polymer membranes based on unmodified and modified polymer of intrinsic microporosity (PIM-1). Layers of two different MOFs, zeolitic imidazolate framework-8 (ZIF-8) and Copper benzene tricarboxylate ((HKUST-1), were grown onto neat PIM-1, amide surface-modified PIM-1 and hexamethylenediamine (HMDA) -modified PIM-1. The surface-grown crystalline MOFs were characterized by a combination of several techniques, including powder X-ray diffraction, infrared spectroscopy and scanning electron microscopy to investigate the film morphology on the neat and modified PIM-1 membranes...
February 11, 2017: Membranes
journal
journal
43930
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"