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Membranes

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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
#1
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
#2
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
#3
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
#4
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
https://www.readbyqxmd.com/read/28208740/recursive-alterations-of-the-relationship-between-simple-membrane-geometry-and-insertion-of-amphiphilic-motifs
#5
REVIEW
Kenneth Lindegaard Madsen, Rasmus Herlo
The shape and composition of a membrane directly regulate the localization, activity, and signaling properties of membrane associated proteins. Proteins that both sense and generate membrane curvature, e.g., through amphiphilic insertion motifs, potentially engage in recursive binding dynamics, where the recruitment of the protein itself changes the properties of the membrane substrate. Simple geometric models of membrane curvature interactions already provide prediction tools for experimental observations, however these models are treating curvature sensing and generation as separated phenomena...
February 8, 2017: Membranes
https://www.readbyqxmd.com/read/28125062/effect-of-sodium-and-chloride-binding-on-a-lecithin-bilayer-a-molecular-dynamics-study
#6
Maria M Reif, Christopher Kallies, Volker Knecht
The effect of ion binding on the structural, mechanical, dynamic and electrostatic properties of a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayer in a 0.5 M aqueous NaCl solution is investigated using classical atomistic molecular dynamics simulation with different force-field descriptions for ion-ion and ion-lipid interactions. Most importantly, the repulsive Lennard-Jones parameters for the latter were modified, such that approximately similar binding of cations and anions to the lipid membrane is achieved...
January 25, 2017: Membranes
https://www.readbyqxmd.com/read/28106775/colloidal-fouling-of-nanofiltration-membranes-development-of-a-standard-operating-procedure
#7
Md Abdullaha Al Mamun, Subir Bhattacharjee, David Pernitsky, Mohtada Sadrzadeh
Fouling of nanofiltration (NF) membranes is the most significant obstacle to the development of a sustainable and energy-efficient NF process. Colloidal fouling and performance decline in NF processes is complex due to the combination of cake formation and salt concentration polarization effects, which are influenced by the properties of the colloids and the membrane, the operating conditions of the test, and the solution chemistry. Although numerous studies have been conducted to investigate the influence of these parameters on the performance of the NF process, the importance of membrane preconditioning (e...
January 18, 2017: Membranes
https://www.readbyqxmd.com/read/28106711/biological-fuel-cells-and-membranes
#8
REVIEW
Zahra Ghassemi, Gymama Slaughter
Biofuel cells have been widely used to generate bioelectricity. Early biofuel cells employ a semi-permeable membrane to separate the anodic and cathodic compartments. The impact of different membrane materials and compositions has also been explored. Some membrane materials are employed strictly as membrane separators, while some have gained significant attention in the immobilization of enzymes or microorganisms within or behind the membrane at the electrode surface. The membrane material affects the transfer rate of the chemical species (e...
January 17, 2017: Membranes
https://www.readbyqxmd.com/read/28085041/acknowledgement-to-reviewers-of-membranes-in-2016
#9
EDITORIAL
Membranes Editorial Office
n/a.
January 11, 2017: Membranes
https://www.readbyqxmd.com/read/28036043/concentration-of-tea-extracts-by-osmotic-evaporation-optimisation-of-process-parameters-and-effect-on-antioxidant-activity
#10
Marisa P Marques, Vítor D Alves, Isabel M Coelhoso
In this work, the concentration process of three different tea extracts (medicinal Rosil No. 6, Black, and Forest Fruit teas) using the osmotic evaporation (OE) process, was studied. The effect of the OE process on the content of phenolic compounds and antioxidant activity was evaluated. The concentration process was carried out in a hollow-fibre membrane contactor with an effective surface area of 0.54 m². The tea extract was circulated through the shell side of the contactor, while a concentrated osmotic solution (CaCl₂ 5 M) was circulated inside the fibres...
December 28, 2016: Membranes
https://www.readbyqxmd.com/read/27999394/nanofiber-ion-exchange-membranes-for-the-rapid-uptake-and-recovery-of-heavy-metals-from-water
#11
Nithinart Chitpong, Scott M Husson
An evaluation of the performance of polyelectrolyte-modified nanofiber membranes was undertaken to determine their efficacy in the rapid uptake and recovery of heavy metals from impaired waters. The membranes were prepared by grafting poly(acrylic acid) (PAA) and poly(itaconic acid) (PIA) to cellulose nanofiber mats. Performance measurements quantified the dynamic ion-exchange capacity for cadmium (Cd), productivity, and recovery of Cd(II) from the membranes by regeneration. The dynamic binding capacities of Cd(II) on both types of nanofiber membrane were independent of the linear flow velocity, with a residence time of as low as 2 s...
December 20, 2016: Membranes
https://www.readbyqxmd.com/read/27999368/structure-and-nanomechanics-of-model-membranes-by-atomic-force-microscopy-and-spectroscopy-insights-into-the-role-of-cholesterol-and-sphingolipids
#12
REVIEW
Berta Gumí-Audenis, Luca Costa, Francesco Carlá, Fabio Comin, Fausto Sanz, Marina I Giannotti
Biological membranes mediate several biological processes that are directly associated with their physical properties but sometimes difficult to evaluate. Supported lipid bilayers (SLBs) are model systems widely used to characterize the structure of biological membranes. Cholesterol (Chol) plays an essential role in the modulation of membrane physical properties. It directly influences the order and mechanical stability of the lipid bilayers, and it is known to laterally segregate in rafts in the outer leaflet of the membrane together with sphingolipids (SLs)...
December 19, 2016: Membranes
https://www.readbyqxmd.com/read/27999364/incorporation-of-graphene-related-carbon-nanosheets-in-membrane-fabrication-for-water-treatment-a-review
#13
REVIEW
Jenny Lawler
The minimization of the trade-off between the flux and the selectivity of membranes is a key area that researchers are continually working to optimise, particularly in the area of fabrication of novel membranes. Flux versus selectivity issues apply in many industrial applications of membranes, for example the unwanted diffusion of methanol in fuel cells, retention of valuable proteins in downstream processing of biopharmaceuticals, rejection of organic matter and micro-organisms in water treatment, or salt permeation in desalination...
December 19, 2016: Membranes
https://www.readbyqxmd.com/read/27983631/vitamin-e-circular-dichroism-studies-insights-into-conformational-changes-induced-by-the-solvent-s-polarity
#14
Drew Marquardt, Brad J Van Oosten, Mikel Ghelfi, Jeffrey Atkinson, Thad A Harroun
We used circular dichroism (CD) to study differences in CD spectra between α-, δ-, and methylated-α-tocopherol in solvents with different polarities. CD spectra of the different tocopherol structures differ from each other in intensity and peak locations, which can be attributed to chromanol substitution and the ability to form hydrogen bonds. In addition, each structure was examined in different polarity solvents using the Reichardt index-a measure of the solvent's ionizing ability, and a direct measurement of solvent-solute interactions...
December 14, 2016: Membranes
https://www.readbyqxmd.com/read/27983630/application-of-semipermeable-membranes-in-glucose-biosensing
#15
REVIEW
Tanmay Kulkarni, Gymama Slaughter
Glucose biosensors have received significant attention in recent years due to the escalating mortality rate of diabetes mellitus. Although there is currently no cure for diabetes mellitus, individuals living with diabetes can lead a normal life by maintaining tight control of their blood glucose levels using glucose biosensors (e.g., glucometers). Current research in the field is focused on the optimization and improvement in the performance of glucose biosensors by employing a variety of glucose selective enzymes, mediators and semipermeable membranes to improve the electron transfer between the active center of the enzyme and the electrode substrate...
December 14, 2016: Membranes
https://www.readbyqxmd.com/read/27983583/treated-seawater-as-a-magnesium-source-for-phosphorous-recovery-from-wastewater-a-feasibility-and-cost-analysis
#16
Cejna Anna Quist-Jensen, Mads Koustrup Jørgensen, Morten Lykkegaard Christensen
Conventional resources of phosphorous are at high risk of depletion in the near future due to current practices of its exploitation, thus new and improved exploration methodologies need to be developed to ensure phosphorous security. Today, some treatment plants recover phosphorous from municipal wastewater as struvite (MgNH₄PO₄·6H₂O). Magnesium is often added to the wastewater as MgCl₂·6H₂O to facilitate the phosphorous recovery. However, the use of magnesium increases the costs of the process and is not aligned with sustainable development, therefore, alternative magnesium sources have to be found...
December 13, 2016: Membranes
https://www.readbyqxmd.com/read/27983579/what-ion-flow-along-ion-channels-can-tell-us-about-their-functional-activity
#17
REVIEW
Lucia Becucci, Rolando Guidelli
The functional activity of channel-forming peptides and proteins is most directly verified by monitoring the flow of physiologically relevant inorganic ions, such as Na⁺, K⁺ and Cl(-), along the ion channels. Electrical current measurements across bilayer lipid membranes (BLMs) interposed between two aqueous solutions have been widely employed to this end and are still extensively used. However, a major drawback of BLMs is their fragility, high sensitivity toward vibrations and mechanical shocks, and low resistance to electric fields...
December 13, 2016: Membranes
https://www.readbyqxmd.com/read/27983578/process-oriented-review-of-bacterial-quorum-quenching-for-membrane-biofouling-mitigation-in-membrane-bioreactors-mbrs
#18
REVIEW
Naila Bouayed, Nicolas Dietrich, Christine Lafforgue, Chung-Hak Lee, Christelle Guigui
Quorum Quenching (QQ) has been developed over the last few years to overcome practical issues related to membrane biofouling, which is currently the major difficulty thwarting the extensive development of membrane bioreactors (MBRs). QQ is the disruption of Quorum Sensing (QS), cell-to-cell communication enabling the bacteria to harmonize their behavior. The production of biofilm, which is recognized as a major part of the biocake formed on a membrane surface, and which leads to biofouling, has been found to be one of the bacterial behaviors controlled by QS...
December 13, 2016: Membranes
https://www.readbyqxmd.com/read/27941637/investigating-sterol-and-redox-regulation-of-the-ion-channel-activity-of-clic1-using-tethered-bilayer-membranes
#19
Heba Al Khamici, Khondher R Hossain, Bruce A Cornell, Stella M Valenzuela
The Chloride Intracellular Ion Channel (CLIC) family consists of six conserved proteins in humans. These are a group of enigmatic proteins, which adopt both a soluble and membrane bound form. CLIC1 was found to be a metamorphic protein, where under specific environmental triggers it adopts more than one stable reversible soluble structural conformation. CLIC1 was found to spontaneously insert into cell membranes and form chloride ion channels. However, factors that control the structural transition of CLIC1 from being an aqueous soluble protein into a membrane bound protein have yet to be adequately described...
December 8, 2016: Membranes
https://www.readbyqxmd.com/read/27929406/a-thin-film-nanocomposite-membrane-with-mcm-41-silica-nanoparticles-for-brackish-water-purification
#20
Mohammed Kadhom, Jun Yin, Baolin Deng
Thin film nanocomposite (TFN) membranes containing MCM-41 silica nanoparticles (NPs) were synthesized by the interfacial polymerization (IP) process. An m-phenylenediamine (MPD) aqueous solution and an organic phase with trimesoyl chloride (TMC) dissolved in isooctane were used in the IP reaction, occurring on a nanoporous polysulfone (PSU) support layer. Isooctane was introduced as the organic solvent for TMC in this work due to its intermediate boiling point. MCM-41 silica NPs were loaded in MPD and TMC solutions in separate experiments, in a concentration range from 0 to 0...
December 6, 2016: Membranes
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