keyword
MENU ▼
Read by QxMD icon Read
search

membrane diffusing capacity

keyword
https://www.readbyqxmd.com/read/28797964/enhancing-biodegradation-of-c16-alkyl-quaternary-ammonium-compounds-using-an-oxygen-based-membrane-biofilm-reactor
#1
YenJung Sean Lai, Aura Ontiveros-Valencia, Zehra Esra Ilhan, Yun Zhou, Evelyn Miranda, Juan Maldonado, Rosa Krajmalnik-Brown, Bruce E Rittmann
Quaternary ammonium compounds (QACs) (e.g., hexadecyltrimethyl-ammonium bromide, CTAB) are emerging contaminants with widespread use as surfactants and disinfectants. Because the initial step of QAC biodegradation is mono-oxygenation, QAC degraders require O2, but normal aeration leads to serious foaming. Here, we developed and tested an oxygen-based membrane biofilm reactor (O2-MBfR) that delivers O2 by diffusion through the walls of hollow-membranes to a biofilm accumulating on the outer surface of membranes...
July 2, 2017: Water Research
https://www.readbyqxmd.com/read/28793192/sulfonic-membrane-sorption-and-permeation-properties-complementary-approaches-to-select-a-membrane-for-pervaporation
#2
Corinne Chappey, Kateryna Yu Fatyeyeva, Edyta Rynkowska, Wojciech Kujawski, Larisa Vasil Evna Karpenko-Jereb, Anne-Marie Kelterer, Stéphane Marais
In this contribution the physical and chemical properties of the dense sulfonic membrane IonClad R4010 in the lithium form were studied to evaluate its potential application in pervaporation. To develop new membrane materials it is necessary to know the influence of the membrane structure on the membrane equilibrium and transport properties. For this purpose, the sorption and permeation measurements of water and methanol in the liquid and vapor states were performed and correlated to the ion pairs/solvent interactions analyzed by the infrared spectroscopy...
August 9, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28782664/intra-session-and-inter-session-variability-of-nitric-oxide-pulmonary-diffusing-capacity-in-adults-with-cystic-fibrosis
#3
Thomas Radtke, Christian Benden, Marion Maggi-Beba, Susi Kriemler, Ivo van der Lee, Holger Dressel
We evaluated the intra-session and inter-session variability of the diffusing capacity of nitric oxide (DLNO), carbon monoxide (DLCO), alveolar-capillary membrane diffusing capacity for carbon monoxide (DMCO) and pulmonary capillary blood volume (Vc) in patients with cystic fibrosis (CF). Patients performed single-breath diffusing capacity measurements during all of 3 consecutive study visits. Precision of gas diffusing parameters was quantified by within-subject standard deviation (SDws) and coefficient of variation (CV)...
August 3, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28772627/bppo-based-anion-exchange-membranes-for-acid-recovery-via-diffusion-dialysis
#4
Muhammad Imran Khan, Rafael Luque, Pepijn Prinsen, Aziz Ur Rehman, Saima Anjum, Muhammad Nawaz, Aqeela Shaheen, Shagufta Zafar, Mujahid Mustaqeem
To reduce the environmental impact of acids present in various industrial wastes, improved and robust anion exchange membranes (AEMs) are highly desired. Moreover, they should exhibit high retention of salts, fast acid permeation and they should be able to operate with low energy input. In this work, AEMs are prepared using a facile solution-casting from brominated poly-(2,6-dimethyl-1,4-phenylene oxide) (BPPO) and increasing amounts of 2-phenylimidazole (PI). Neither quaternary ammonium salts, nor ionic liquids and silica-containing compounds are involved in the synthesis...
March 7, 2017: Materials
https://www.readbyqxmd.com/read/28769101/allostimulatory-capacity-of-conditionally-immortalized-proximal-tubule-cell-lines-for-bioartificial-kidney-application
#5
Milos Mihajlovic, Lambertus P van den Heuvel, Joost G Hoenderop, Jitske Jansen, Martijn J Wilmer, Annemarie J F Westheim, Wil A Allebes, Dimitrios Stamatialis, Luuk B Hilbrands, Rosalinde Masereeuw
Novel renal replacement therapies, such as a bioartificial kidney (BAK), are needed to improve current hemodialysis treatment of end-stage renal disease (ESRD) patients. As BAK applications may reveal safety concerns, we assessed the alloimmunization and related safety aspects of readily available conditionally immortalized human proximal tubule epithelial cell (ciPTEC) lines to be used in BAK. Two ciPTEC lines, originally derived from urine and kidney tissue, were characterized for the expression and secretion of relevant molecules involved in alloimmunization and inflammatory responses, such as HLA class-I, HLA-DR, CD40, CD80, CD86, as wells as soluble HLA class I and proinflammatory cytokines (IL-6, IL-8 and TNF-α)...
August 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28767129/the-role-of-euglena-gracilis-paramylon-in-modulating-xylem-hormone-levels-photosynthesis-and-water-use-efficiency-in-solanum-lycopersicum-l
#6
Andrea Scartazza, Piero Picciarelli, Lorenzo Mariotti, Maurizio Curadi, Laura Barsanti, Paolo Gualtieri
β-1,3-glucans such as paramylon act as elicitors in plants, modifying the hormonal levels and the physiological responses. Plant hormones affect all phases of the plant life cycle and their responses to environmental stresses, both biotic and abiotic. The aim of this study was to investigate the effects of a root treatment with Euglena gracilis paramylon on xylem hormonal levels, photosynthetic performance and dehydration stress in tomato (Solanum lycopersicum L.). Paramylon granules were processed to obtain the linear fibrous structures capable to interact with tomato cell membrane...
August 2, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28767072/insights-into-the-mechanisms-involved-in-strong-hemorrhage-and-dermonecrosis-induced-by-atroxlysin-ia-a-pi-class-snake-venom-metalloproteinase
#7
Luciana Aparecida Freitas-de-Sousa, Mônica Colombini, Mônica Lopes-Ferreira, Solange M T Serrano, Ana Maria Moura-da-Silva
Hemorrhage is the most prominent effect of snake venom metalloproteinases (SVMPs) in human envenomation. The capillary injury is a multifactorial effect caused by hydrolysis of the components of the basement membrane (BM). The PI and PIII classes of SVMPs are abundant in viperid venoms and hydrolyze BM components. However, hemorrhage is associated mostly with PIII-class SVMPs that contain non-catalytic domains responsible for the binding of SVMPs to BM proteins, facilitating enzyme accumulation in the tissue and enhancing its catalytic efficiency...
August 2, 2017: Toxins
https://www.readbyqxmd.com/read/28759793/modelling-recovery-of-ammonium-from-urine-by-electro-concentration-in-a-3-chamber-cell
#8
Emma Thompson Brewster, Johannes Jermakka, Stefano Freguia, Damien J Batstone
Electro-concentration enables treatment and nutrient recovery from source-separated urine, and is a potential technology for on-site treatment using a 3 compartment configuration that has anode, cathode and middle concentrate compartments. There is a particular focus on driving concentration towards the precipitation threshold in the concentrate compartment to generate solid ammonium salts, including ammonium bicarbonate. To evaluate controlling mechanisms and the feasibility of achieving high concentrations, a dynamic mechanistic model was developed and validated using experiments with synthetic urine...
July 20, 2017: Water Research
https://www.readbyqxmd.com/read/28723110/portable-sensor-for-the-detection-of-choline-and-its-derivatives-based-on-silica-isoporous-membrane-and-gellified-nanointerfaces
#9
Lisiqi Xie, Xiao Huang, Bin Su
A portable amperometric ion sensor was fabricated by integrating silica isoporous membrane (SIM) and organogel composed of polyvinyl chloride and 1,2-dichloroethane (PVC-DCE) on a 3D-printed polymer chip. The detection of ionic species in aqueous samples could be accomplished by adding a microliter of sample droplet to the sensor and by identifying the ion-transfer potential and current magnitude at the water/organogel interface array templated by SIM. Thanks to the ultrasmall channel size (2-3 nm in diameter), high channel density (4 × 10(8) μm(-2)), and ultrathin thickness (80 nm) of SIM, the ensemble of nanoscopic water/organogel (nano-W/Gel) interface array behaved like a microinterface with two back-to-back hemispherical mass diffusion zones...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28719106/altered-pulmonary-gas-transfer-capacity-and-capillary-blood-volume-in-pediatric-crohn-s-disease
#10
Marie Verstraete, Marie-Luce Choukroun, Valerie Siao-Him Fa, Michael Fayon, Laurent Rebouissoux, Raphael Enaud, Thierry Lamireau
OBJECTIVES: To describe diffusing capacity for carbon monoxide (DLCO) and its components, that is, membrane diffusing capacity (DmCO) and pulmonary capillary blood volume (Vc) in children with Crohn's disease (CD), and to investigate the correlation between these parameters and disease activity. WORKING HYPOTHESIS: The most common lung function abnormalities are a reduced pulmonary DLCO and small airways disorders which are in many instances, clinically silent. No valid explanations have been proposed regarding the modifications in gas transfer capacity in active CD...
August 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/28690622/nitrogen-metabolism-in-adaptation-of-photosynthesis-to-water-stress-in-rice-grown-under-different-nitrogen-levels
#11
Chu Zhong, Xiaochuang Cao, Jijie Hu, Lianfeng Zhu, Junhua Zhang, Jianliang Huang, Qianyu Jin
To investigate the role of nitrogen (N) metabolism in the adaptation of photosynthesis to water stress in rice, a hydroponic experiment supplying with low N (0.72 mM), moderate N (2.86 mM), and high N (7.15 mM) followed by 150 g⋅L(-1) PEG-6000 induced water stress was conducted in a rainout shelter. Water stress induced stomatal limitation to photosynthesis at low N, but no significant effect was observed at moderate and high N. Non-photochemical quenching was higher at moderate and high N. In contrast, relative excessive energy at PSII level (EXC) was declined with increasing N level...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28635032/amino-functionalized-zif-7-nanocrystals-improved-intrinsic-separation-ability-and-interfacial-compatibility-in-mixed-matrix-membranes-for-co2-ch4-separation
#12
Long Xiang, Luqian Sheng, Chongqing Wang, Lixiong Zhang, Yichang Pan, Yanshuo Li
Highly permeable and selective, as well as plasticization-resistant membranes are desired as promising alternatives for cost- and energy-effective CO2 separation. Here, robust mixed-matrix membranes based on an amino-functionalized zeolitic imidazolate framework ZIF-7 (ZIF-7-NH2 ) and crosslinked poly(ethylene oxide) rubbery polymer are successfully fabricated with filler loadings up to 36 wt%. The ZIF-7-NH2 materials synthesized from in situ substitution of 2-aminobenzimidazole into the ZIF-7 structure exhibit enlarged aperture size compared with monoligand ZIF-7...
June 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28607172/tweety-homolog-1-drives-brain-colonization-of-gliomas
#13
Erik Jung, Matthias Osswald, Jonas Blaes, Benedikt Wiestler, Felix Sahm, Torsten Schmenger, Gergely Solecki, Katrin Deumelandt, Felix T Kurz, Ruifan Xie, Sophie Weil, Oliver Heil, Carina Thomé, Miriam Gömmel, Mustafa Syed, Peter Häring, Peter E Huber, Sabine Heiland, Michael Platten, Andreas von Deimling, Wolfgang Wick, Frank Winkler
Early and progressive colonization of the healthy brain is one hallmark of diffuse gliomas, including glioblastomas. We recently discovered ultralong (>10 to hundreds of microns) membrane protrusions [tumor microtubes (TMs)] extended by glioma cells. TMs have been associated with the capacity of glioma cells to effectively invade the brain and proliferate. Moreover, TMs are also used by some tumor cells to interconnect to one large, resistant multicellular network. Here, we performed a correlative gene-expression microarray and in vivo imaging analysis, and identified novel molecular candidates for TM formation and function...
July 19, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28571540/caffeic-acid-in-dermatological-formulations-in-vitro-release-profile-and-skin-absorption
#14
Caroline Magnani Spagnol, Leonardo Delello Di Filippo, Vera Lucia Borges Isaac, Marcos Antonio Corrêa, Hérida Regina Nunes Salgado
Caffeic acid (CA) is a cinnamic acid derivative, found in many vegetable products, with powerful antioxidant activity, the ability to increase collagen production and capacity to prevent premature aging of the skin. The classic emulsions of CA are widely used by the consumer to provide a pleasant, refreshing sensorial experience; however, preparations developed in the form of dry film are presented as a technological alternative due to its facile and safe transportation. The aim of this study was to evaluate the release, permeation, and retention of CA in a film and emulsion through in vitro experiments...
June 1, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28554819/interstitial-lung-fluid-balance-in-healthy-lowlanders-exposed-to-high-altitude
#15
Bryan J Taylor, Glenn M Stewart, Jan W Marck, Douglas T Summerfield, Amine N Issa, Bruce D Johnson
We aimed to assess lung fluid balance before and after gradual ascent to 5150m. Lung diffusion capacity for carbon monoxide (DLCO), alveolar-capillary membrane conductance (DmCO) and ultrasound lung comets (ULCs) were assessed in 12 healthy lowlanders at sea-level, and on Day 1, Day 5 and Day 9 after arrival at Mount Everest Base Camp (EBC). EBC was reached following an 8-day hike at progressively increasing altitudes starting at 2860m. DLCO was unchanged from sea-level to Day 1 at EBC, but increased on Day 5 (11±10%) and Day 9 (10±9%) vs...
September 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28471113/antibacterial-mechanism-of-high-mobility-group-nucleosomal-binding-domain-2-on-the-gram-negative-bacteria-escherichia-coli
#16
Heng Li, Xiao-Fei Shen, Xin-E Zhou, Yan-E Shi, Lu-Xia Deng, Yi Ma, Xiao-Ying Wang, Jing-Yu Li, Ning Huang
OBJECTIVE: To investigate the antibacterial mechanism of high-mobility group nucleosomal-binding domain 2 (HMGN2) on Escherichia coli K12, focusing on the antibacterial and antibiofilm formation effects. Its chemotactic activity on human neutrophils was also investigated. METHODS: Human tissue-derived HMGN2 (tHMGN2) was extracted from fresh uterus fiber cystadenoma and purified by HP1100 reversed-phase high-performance liquid chromatography (RP-HPLC). Recombinant human HMGN2 (rHMGN2) was generated in E...
May 2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/28452496/thermodynamic-paradigm-for-solution-demixing-inspired-by-nuclear-transport-in-living-cells
#17
Ching-Hao Wang, Pankaj Mehta, Michael Elbaum
Living cells display a remarkable capacity to compartmentalize their functional biochemistry. A particularly fascinating example is the cell nucleus. Exchange of macromolecules between the nucleus and the surrounding cytoplasm does not involve traversing a lipid bilayer membrane. Instead, large protein channels known as nuclear pores cross the nuclear envelope and regulate the passage of other proteins and RNA molecules. Beyond simply gating diffusion, the system of nuclear pores and associated transport receptors is able to generate substantial concentration gradients, at the energetic expense of guanosine triphosphate hydrolysis...
April 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28448930/determining-equilibrium-partition-coefficients-between-lipid-protein-and-polydimethylsiloxane-for-highly-hydrophobic-organic-contaminants-using-preloaded-disks
#18
Yuanyuan Pei, Huizhen Li, Jing You
Bioaccumulation of hydrophobic organic contaminants is of great concern and understanding their partitioning to biological phases is crucial for estimating their bioaccumulation potential. The estimation, however, was of large uncertainty for highly hydrophobic organic contaminants (HHOCs) with log KOW>9 due to the challenge of quantifying their water concentrations. In the present study, partition coefficients between polydimethylsiloxane (PDMS) and storage lipid (KSL,PDMS), membrane lipid (KML,PDMS) and protein (Kpro,PDMS) were measured for 21 polychlorinated biphenyls (PCBs), 14 polybrominated diphenyl ethers (PBDEs), dechlorane plus (DP) and decabromodiphenyl ethane (DBDPE), covering log KOW from 5...
November 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28417297/regulation-of-the-glucose-supply-from-capillary-to-tissue-examined-by-developing-a-capillary-model
#19
Akitoshi Maeda, Yukiko Himeno, Masayuki Ikebuchi, Akinori Noma, Akira Amano
A new glucose transport model relying upon diffusion and convection across the capillary membrane was developed, and supplemented with tissue space and lymph flow. The rate of glucose utilization (J util) in the tissue space was described as a saturation function of glucose concentration in the interstitial fluid (C glu,isf), and was varied by applying a scaling factor f to J max. With f = 0, the glucose diffusion ceased within ~20 min. While, with increasing f, the diffusion was accelerated through a decrease in C glu,isf, but the convective flux remained close to resting level...
April 17, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28361852/epr-spectroscopy-studies-of-changes-in-erythrocyte-membranes-in-patients-with-laryngeal-cancer
#20
Y B Burlaka, O V Sukhoveev, N V Grin, O M Khilchevskyi, S V Verevka
AIM: To evaluate microviscosity and sorption capacity of erythrocyte membranes (SCEM) from patients with laryngeal cancer (LC). MATERIALS AND METHODS: Samples from 35 patients with LC of stages II and III and 20 healthy volunteers were investigated by electron paramagnetic resonance with Bis(1-oxyl-2,2,6,6-tetramethylpiperidinyl-4)-ester of 5,7-dimethyladamantane-1,3-dicarbonic acid (AdTEMPO) probe. SCEM was evaluated by amount of unabsorbed methylene blue. RESULTS: Microviscosity of erythrocyte membranes was determined by the effective rotational diffusion correlation times (τeff) and a decrease in radical spectrum signal intensity per hour...
March 2017: Experimental Oncology
keyword
keyword
51660
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"