keyword
MENU ▼
Read by QxMD icon Read
search

Membranes

keyword
https://www.readbyqxmd.com/read/29241279/does-early-artificial-rupture-of-membranes-speed-labor-in-preterm-inductions
#1
Melissa M Parrish, Spencer G Kuper, Victoria C Jauk, Sima H Baalbaki, Alan T Tita, Lorie M Harper
No abstract text is available yet for this article.
December 14, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/29241230/influence-of-repetitive-diving-in-saltwater-on-pressure-equalization-and-eustachian-tube-function-in-recreational-scuba-divers
#2
Moritz F Meyer, Manuela Boor, Stefanie Jansen, Eberhard D Pracht, Moritz Felsch, Heinz D Klünter, Karl-Bernd Hüttenbrink, Dirk Beutner, Maria Grosheva
INTRODUCTION: We investigated in a prospective, observational trial the feasibility of using the Eustachian tube function test (ETFT) to measure the effect of repetitive pressure exposure during open seawater dives on Eustachian tube function. METHODS: The study included 28 adult divers during six consecutive days of diving in the Red Sea. Participants underwent otoscopy and ETFT before the first dive, between each dive and after the last dive. ETFT included regular tympanometry (R-tymp), tympanometry after Valsalva (V-tymp) and after swallowing (S-tymp)...
December 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/29241162/in-vitro-and-in-vivo-activity-of-fomitopsis-pinicola-sw-ex-fr-karst-chloroform-fpkc-extract-against-s180-tumor-cells
#3
Ye Gao, Pan Wang, Yaqin Wang, Lijie Wu, Xiaobing Wang, Kun Zhang, Quanhong Liu
BACKGROUND/AIMS: Non-toxic fomitopsis is has been traditionally used in folk medicine in many countries for its anti-inflammatory and anti-vascular disease activities. The present study investigates the antitumor effect of Fomitopsis pinicola (Sw. Ex Fr.) Karst chloroform extract (FPKc) on S180 tumor cells in vitro and in vivo and we determined the underlying mechanisms. METHODS: HPLC was employed to analyze the constituents of FPKc. In-vitro 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was performed to quantify the growth inhibition of FPKc; Propidium iodide (PI) exclusion assay and scanning electron microscopy (SEM) were used to observe the damage on the cell membrane and the changes of the cell morphology; Staining with Hoechst 33342/propidium iodide (HO/PI) and the application of the Annexin V-FITC/PI analysis permitted to observe the cell death triggered by FPKc; DNA damage and cell cycle arrest were detected by flow cytometry; Rhodamine 123 (RH123) and Cytochrome C were used as dyes to investigate the alterations of the mitochondria...
December 12, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29241127/high-strength-n-methyl-2-pyrrolidone-containing-process-wastewater-treatment-using-sequencing-batch-reactor-and-membrane-bioreactor-a-feasibility-study
#4
Chun Heng Loh, Bing Wu, Liya Ge, Chaozhi Pan, Rong Wang
N-methyl-2-pyrrolidone (NMP) is widely used as a solvent in polymeric membrane fabrication process, its elimination from the process wastewater (normally at a high concentration > 1000 mg/L) prior to discharge is essential because of environmental concern. This study investigated the feasibility of treating high-strength NMP-containing process wastewater in a sequencing batch reactor (SBR; i.e., batch feeding and intermittent aerobic/anoxic condition) and a membrane bioreactor (MBR; i.e., continuous feeding and aeration), respectively...
December 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241113/concentrating-molasses-distillery-wastewater-using-biomimetic-forward-osmosis-fo-membranes
#5
N Singh, I Petrinic, C Hélix-Nielsen, S Basu, M Balakrishnan
Treatment of sugarcane molasses distillery wastewater is challenging due to the presence of complex phenolic compounds (melanoidins and polyphenols) having antioxidant properties. Due to zero liquid discharge regulations, Indian distilleries continue to explore effective treatment options. This work examines the concentration of distillery wastewater by forward osmosis (FO) using aquaporin biomimetic membranes and magnesium chloride hexahydrate (MgCl2.6H2O) as draw solution. The operational parameters viz. feed solution and draw solution flow rate and draw solution concentration were optimized using 10% v/v melanoidins model feed solution...
December 8, 2017: Water Research
https://www.readbyqxmd.com/read/29241112/chromium-isotope-fractionation-during-cr-vi-reduction-in-a-methane-based-hollow-fiber-membrane-biofilm-reactor
#6
Yong-Ze Lu, Guo-Jun Chen, Ya-Nan Bai, Liang Fu, Li-Ping Qin, Raymond Jianxiong Zeng
Chromium (Cr) isotope fractionation analysis is a promising tool for monitoring Cr(VI) reduction in natural aqueous systems. In addition, large amounts of CH4 in natural aqueous sediments are oxidized to CO2 through methanotrophs, thereby mitigating emissions to the atmosphere. However, the investigations on the Cr(VI) reduction process with methanotrophs, and the associated Cr isotope fractionation patterns are scarce. In this study, we have shown that Cr(VI) reduction can occur in the presence of CH4 as the sole electron donor in a hollow-fiber membrane reactor (HfMBR) after direct bacteria enrichment from sediment samples...
December 7, 2017: Water Research
https://www.readbyqxmd.com/read/29241072/combined-efficacy-of-oseltamivir-isoprinosine-and-ellagic-acid-in-influenza-a-h3n2-infected-mice
#7
Elitsa L Pavlova, Lora S Simeonova, Galina A Gegova
Influenza pathogenesis comprises a complex cascade of impaired cellular processes resulting from the viral replication and exaggerated immune response accompanied by reactive oxygen species (ROS) burst and oxidative stress, destructing membranous structures and tissues. By classical virological and biochemical methods we compared and evaluated the therapeutic effects of 2.5mg/kg/day of the antiviral drug - oseltamivir (OS), 500mg/kg/day of the immune modulator - isoprinosine (IP) and 500mg/kg/day of the antioxidant agent ellagic acid (EA) with a focus on their combined activities in influenza H3N2 virus-infected mice...
December 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29241007/sulfur-doped-laser-induced-porous-graphene-derived-from-polysulfone-class-polymers-and-membranes
#8
Swatantra Pratap Singh, Yilun Li, Jibo Zhang, James M Tour, Christopher J Arnusch
Graphene based materials have profoundly impacted research in nanotechnology and this has significantly advanced biomedical, electronics, energy, and environmental applications. Laser-induced graphene (LIG) is made photothermally and has enabled a rapid route for graphene layers on polyimide surfaces. However, polysulfone (PSU), polyethersulfone (PES), and polyphenylsulfone (PPSU) are highly used in numerous applications including medical, energy and water treatment and they are critical components of polymer membranes...
December 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/29241006/toxoid-vaccination-against-bacterial-infection-using-cell-membrane-coated-nanoparticles
#9
Pavimol Angsantikul, Ronnie H Fang, Liangfang Zhang
As nanoparticles exhibit unique properties attractive for vaccine development, they have been progressively implemented as antigen delivery platforms and immune potentiators. Recently, cell membrane-coated nanoparticles have provided a novel approach for intercepting and neutralizing bacterial toxins by leveraging their natural affinity to cellular membranes. Such toxin-nanoparticle assemblies, termed nanotoxoids, allow rapid loading of different types of toxins and have been investigated for their ability to effectively confer protection against bacterial infection...
December 14, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29240955/pine-wilt-disease-causes-cavitation-around-the-resin-canals-and-irrecoverable-xylem-conduit-dysfunction
#10
Kenichi Yazaki, Takuma Takanashi, Natsumi Kanzaki, Masabumi Komatsu, Delphis F Levia, Daisuke Kabeya, Hiroyuki Tobita, Mitsutoshi Kitao, Atsushi Ishida
Physiological mechanisms of irreversible hydraulic dysfunction in seedlings infected with pine wilt disease (PWD) are still unclear. We employed cryo-scanning electron microscopy (cryo-SEM) to investigate the temporal and spatial changes in water distribution within the xylem of the main stem of 2-year-old Japanese black pine seedlings infested by pine wood nematodes (PWNs). Our experiment was specifically designed to compare the water relations among seedlings subjected to the following water treatment and PWN combinations: (i) well-watered versus prolonged drought (no PWNs); and (ii) well-watered with PWNs versus water-stressed with PWNs (four treatments in total)...
December 12, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29240857/the-latest-drugs-and-small-molecule-inhibitors-for-skin-and-hair
#11
Varun Kalhun, Neil Sadick
<p>Biologic drugs, a novel class of agents engineered to target specifc mediators of infammation, and small-molecule inhibitors that pen-etrate the cell membrane to interact with targets inside a cell represent the cutting-edge of pharmacological biomedical therapeutics. Clinical studies have already demonstrated the effectiveness of this new generation of drugs in treating a variety of medical illnesses and conditions that were refractory to traditional treatments. This review aims to describe the latest available or currently in-develop-ment drugs, biologic agents, and small molecule inhibitors for treatment of psoriasis, rosacea, alopecia areata, and atopic dermatitis...
December 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29240845/ras-gap-related-and-c-terminal-domain-dependent-localization-and-tumorigenic-activities-of-iqgap1-in-melanoma-cells
#12
Michael Reimer, Elisabeth Denby, Silviya P Zustiak, Joseph M Schober
IQGAP1 interacts with a number of binding partners through a calponin homology domain (CHD), a WW motif, IQ repeats, a Ras GAP-related domain (GRD), and a conserved C-terminal (CT) domain. Among various biological and cellular functions, IQGAP1 is known to play a role in actin cytoskeleton dynamics during membrane ruffling and lamellipodium protrusion. In addition, phosphorylation near the CT domain is thought to control IQGAP1 activity through regulation of intramolecular interaction. In a previous study, we discovered that IQGAP1 preferentially localizes to retracting areas in B16F10 mouse melanoma cells, not areas of membrane ruffling and lamellipodium protrusion...
2017: PloS One
https://www.readbyqxmd.com/read/29240839/the-soluble-loop-bc-region-guides-but-not-dictates-the-assembly-of-the-transmembrane-cytochrome-b6
#13
Lydia Tome-Stangl, Cornelia Schaetzel, Stefan Tenzer, Frank Bernhard, Dirk Schneider
Studying folding and assembly of naturally occurring α-helical transmembrane proteins can inspire the design of membrane proteins with defined functions. Thus far, most studies have focused on the role of membrane-integrated protein regions. However, to fully understand folding pathways and stabilization of α-helical membrane proteins, it is vital to also include the role of soluble loops. We have analyzed the impact of interhelical loops on folding, assembly and stability of the heme-containing four-helix bundle transmembrane protein cytochrome b6 that is involved in charge transfer across biomembranes...
2017: PloS One
https://www.readbyqxmd.com/read/29240771/a-master-equation-approach-to-actin-polymerization-applied-to-endocytosis-in-yeast
#14
Xinxin Wang, Anders E Carlsson
We present a Master Equation approach to calculating polymerization dynamics and force generation by branched actin networks at membranes. The method treats the time evolution of the F-actin distribution in three dimensions, with branching included as a directional spreading term. It is validated by comparison with stochastic simulations of force generation by actin polymerization at obstacles coated with actin "nucleation promoting factors" (NPFs). The method is then used to treat the dynamics of actin polymerization and force generation during endocytosis in yeast, using a model in which NPFs form a ring around the endocytic site, centered by a spot of molecules attaching the actin network strongly to the membrane...
December 14, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29240755/integrating-transcriptomics-and-metabolomics-to-characterize-the-regulation-of-epa-biosynthesis-in-response-to-cold-stress-in-seaweed-bangia-fuscopurpurea
#15
Min Cao, Dongmei Wang, Yunxiang Mao, Fanna Kong, Guiqi Bi, Qikun Xing, Zhen Weng
Bangia fuscopurpurea is a traditional mariculture crop having high nutritional value, eicosapntemacnioc acid (EPA) production, and protein content. As an intertidal species, it can tolerate drastic changes in abiotic factors such as temperature, hydration, and light radiation; however, genomic information on the evolutionary aspect and mechanism of EPA enrichment in B. fuscopurpurea and the role of EPA in cold tolerance in this species remain elusive. We conducted transcriptome profile analysis in B. fuscopurpurea to investigate the biological functions of genes associated with resistance to various environment factors...
2017: PloS One
https://www.readbyqxmd.com/read/29240716/impedance-spectroscopy-analysis-and-equivalent-circuit-modeling-of-graphene-oxide-solutions
#16
Youngbin Yoon, Jeonghoo Jo, Seungdu Kim, In Gyu Lee, Byung Jin Cho, Myunghun Shin, Wan Sik Hwang
The optical and electrical characteristics of a graphene oxide solution (GS) with different graphene oxide (GO) concentrations in de-ionized water are investigated via the electrochemical impedance spectroscopy (EIS) method. The measurement results produced by the EIS for the GS are represented with both Bode and Nyquist plots in a frequency range from 1 kHz to 10 MHz. Using these results, we develop an equivalent circuit model as a function of the GO concentration, representing the GS as a mixed circuit of two-dimensional (2D) GO dispersed in parallel in de-ionized (DI) water...
December 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29240711/nad1-controls-defense-like-responses-in-medicago-truncatula-symbiotic-nitrogen-fixing-nodules-following-rhizobial-colonization-in-a-baca-independent-manner
#17
Ágota Domonkos, Szilárd Kovács, Anikó Gombár, Ernő Kiss, Beatrix Horváth, Gyöngyi Z Kováts, Attila Farkas, Mónika T Tóth, Ferhan Ayaydin, Károly Bóka, Lili Fodor, Pascal Ratet, Attila Kereszt, Gabriella Endre, Péter Kaló
Legumes form endosymbiotic interaction with host compatible rhizobia, resulting in the development of nitrogen-fixing root nodules. Within symbiotic nodules, rhizobia are intracellularly accommodated in plant-derived membrane compartments, termed symbiosomes. In mature nodule, the massively colonized cells tolerate the existence of rhizobia without manifestation of visible defense responses, indicating the suppression of plant immunity in the nodule in the favur of the symbiotic partner. Medicago truncatulaDNF2 (defective in nitrogen fixation 2) and NAD1 (nodules with activated defense 1) genes are essential for the control of plant defense during the colonization of the nitrogen-fixing nodule and are required for bacteroid persistence...
December 14, 2017: Genes
https://www.readbyqxmd.com/read/29240705/two-ply-composite-membranes-with-separation-layers-from-chitosan-and-sulfoethylcellulose-on-a-microporous-support-based-on-poly-diphenylsulfone-n-phenylphthalimide
#18
Svetlana V Kononova, Elena V Kruchinina, Valentina A Petrova, Yulia G Baklagina, Kira A Romashkova, Anton S Orekhov, Vera V Klechkovskaya, Yury A Skorik
Two-ply composite membranes with separation layers from chitosan and sulfoethylcellulose were developed on a microporous support based on poly(diphenylsulfone-N-phenylphthalimide) and investigated by use of X-ray diffraction and scanning electron microscopy methods. The pervaporation properties of the membranes were studied for the separation of aqueous alcohol (ethanol, propan-2-ol) mixtures of different compositions. When the mixtures to be separated consist of less than 15 wt % water in propan-2-ol, the membranes composed of polyelectrolytes with the same molar fraction of ionogenic groups (-NH₃⁺ for chitosan and -SO₃- for sulfoethylcellulose) show high permselectivity (the water content in the permeate was 100%)...
December 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29240676/from-ion-current-to-electroosmotic-flow-rectification-in-asymmetric-nanopore-membranes
#19
REVIEW
Juliette Experton, Xiaojian Wu, Charles R Martin
Asymmetrically shaped nanopores have been shown to rectify the ionic current flowing through pores in a fashion similar to a p-n junction in a solid-state diode. Such asymmetric nanopores include conical pores in polymeric membranes and pyramidal pores in mica membranes. We review here both theoretical and experimental aspects of this ion current rectification phenomenon. A simple intuitive model for rectification, stemming from previously published more quantitative models, is discussed. We also review experimental results on controlling the extent and sign of rectification...
December 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29240674/evaluation-of-the-cytotoxicity-and-genotoxicity-of-flavonolignans-in-different-cellular-models
#20
Michal Bijak, Ewelina Synowiec, Przemyslaw Sitarek, Tomasz Sliwiński, Joanna Saluk-Bijak
Flavonolignans are the main components of silymarin, which represents 1.5-3% of the dry fruit weight of Milk thistle (Silybum marianum L. Gaernt.). In ancient Greece and Romania, physicians and herbalists used the Silybum marianum to treat a range of liver diseases. Besides their hepatoprotective action, silymarin flavonolignans have many other healthy properties, such as anti-platelet and anti-inflammatory actions. The aim of this study was to evaluate the toxic effect of flavonolignans on blood platelets, peripheral blood mononuclear cells (PBMCs) and human lung cancer cell line-A549-using different molecular techniques...
December 14, 2017: Nutrients
keyword
keyword
66147
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"