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membrane diffusing capacity

Kejia Ji, Hongjie Xu, Xiaodong Ma, Jie Yin, Xuesong Jiang
Porous membranes with the uniform nanostructure and selective adsorption can realize molecular filtration with high flux, and raise great concern for its wide application in water treatment and industrial separation. Herein, a novel hyperbranched poly (ether amine)@poly (vinylidene fluoride) (hPEA@PVDF) porous membrane with the oriented nanostructure and selective adsorption of guest molecules was fabricated by firstly applying combined crystallization and diffusion (CCD) method for the functionalization of PVDF membrane...
March 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Eda Yuhana Ariffin, Yook Heng Lee, Dedi Futra, Ling Ling Tan, Nurul Huda Abd Karim, Nik Nuraznida Nik Ibrahim, Asmat Ahmad
A novel electrochemical DNA biosensor for ultrasensitive and selective quantitation of Escherichia coli DNA based on aminated hollow silica spheres (HSiSs) has been successfully developed. The HSiSs were synthesized with facile sonication and heating techniques. The HSiSs have an inner and an outer surface for DNA immobilization sites after they have been functionalized with 3-aminopropyltriethoxysilane. From field emission scanning electron microscopy images, the presence of pores was confirmed in the functionalized HSiSs...
March 5, 2018: Analytical and Bioanalytical Chemistry
Elena Cutrín Gómez, Soledad Anguiano Igea, José Luis Gómez Amoza, Francisco J Otero Espinar
Soluble derivatives of β-cyclodextrin (CD) have a high capacity to solubilise hydrophobic molecules and to interact with proteins and membrane component. As consequence CD derivatives shows a significant activity as drug absorption enhancers through different delivery routes, such as the oral, nasal, ocular or topical route. In this paper, the effect of two CD derivatives -methyl-β-cyclodextrin (MBCD) and hydroxypropyl-β-cyclodextrin (HPB)- on the structure and permeability of the nail plate has been studied using the drug model ciclopirox olamine...
February 28, 2018: European Journal of Pharmaceutical Sciences
Amrita Rath, P M Geethu, Santhosh Mathesan, Dillip K Satapathy, Pijush Ghosh
We report the controlled reversible and irreversible folding behavior of a biopolymer film simply by tuning the solvent characteristics. Generally, solvent triggered folding of soft membranes or film is achieved by unfolding. Here, we show that this unfolding behavior can be suppressed/delayed or even completely eliminated by altering the intrinsic nature of the solvent. A reversible folding of biopolymer film is observed in response to water, whereas, an irreversible folding is observed in the presence of an aromatic alcohol (AA) solution of different molar concentrations...
February 7, 2018: Soft Matter
Paraskevi S Gerogianni, Maria V Chatziathanasiadou, Dimitrios A Diamantis, Andreas G Tzakos, Dimitrios Galaris
Phenolic acids represent abundant components contained in human diet. However, the negative charge in their carboxylic group limits their capacity to diffuse through biological membranes, thus hindering their access to cell interior. In order to promote the diffusion of rosmarinic acid through biological membranes, we synthesized several lipophilic ester- and amide-derivatives of this compound and evaluated their capacity to prevent H2O2-induced DNA damage and apoptosis in cultured human cells. Esterification of the carboxylic moiety with lipophilic groups strongly enhanced the capacity of rosmarinic acid to protect cells...
February 2, 2018: Redox Biology
Steven C Chase, Caitlin C Fermoyle, Courtney M Wheatley, Jacob J Schaefer, Lyle J Olson, Bruce D Johnson
AIMS: The effect of extravascular lung water (EVLW) and relationship to functional status as a result of acute decompensated heart failure (ADHF) are not well understood. We sought to quantify changes in clinical variables, EVLW, airway anatomy, spirometry, and diffusing capacity for carbon monoxide before and after treatment for ADHF. METHODS AND RESULTS: Fifteen patients were recruited within 24 h of hospital admission. Spirometry, diffusing capacity for carbon monoxide, and surrogates of EVLW by computed tomography were measured and were then repeated within 24 h of discharge...
January 18, 2018: ESC Heart Failure
Hannah H Tuson, Matthew H Foley, Nicole M Koropatkin, Julie S Biteen
Bacteroides thetaiotaomicron (Bt) is a prominent member of the human gut microbiota with an extensive capacity for glycan harvest. This bacterium expresses a five-protein complex in the outer membrane, called the starch utilization system (Sus), which binds, degrades, and imports starch into the cell. Sus is a model system for the many glycan-targeting polysaccharide utilization loci found in Bt and other members of the Bacteroidetes phylum. Our previous work has shown that SusG, a lipidated amylase in the outer membrane, explores the entire cell surface but diffuses more slowly as it interacts with starch...
January 12, 2018: Biophysical Journal
Milène Nitenberg, Anaïs Bénarouche, Ofelia Maniti, Estelle Marion, Laurent Marsollier, Julie Géan, Erick J Dufourc, Jean-François Cavalier, Stéphane Canaan, Agnès P Girard-Egrot
Mycolactone is a lipid-like endotoxin synthesized by an environmental human pathogen, Mycobacterium ulcerans, the causal agent of Buruli ulcer disease. Mycolactone has pleiotropic effects on fundamental cellular processes (cell adhesion, cell death and inflammation). Various cellular targets of mycolactone have been identified and a literature survey revealed that most of these targets are membrane receptors residing in ordered plasma membrane nanodomains, within which their functionalities can be modulated...
January 10, 2018: PLoS Pathogens
David Nicolas Østedgaard-Munck, Jacopo Catalano, Mette Birch Kristensen, Anders Bentien
This article elaborates on the design and optimization of a specialized flow cell for the measurement of direct conversion of pressure into electrical energy (Electrokinetic Energy Conversion, EKEC) which has been presented in Østedgaard-Munck et al. (2017) [1]. Two main flow cell parameters have been monitored and optimized: A) the hydraulic pressure profile on each side of the membrane introduced by pumps recirculating the electrolyte solution through the flow fields and B) the electrical resistance between the current collectors across the combined flow cell...
December 2017: Data in Brief
Astrid Walrant, Sébastien Cardon, Fabienne Burlina, Sandrine Sagan
Living organisms have to maintain a stable balance in molecules and ions in the changing environment in which they are living, a process known as homeostasis. At the level of cells, the plasma membrane has a major role in homeostasis, since this hydrophobic film prevents passive diffusion of large and hydrophilic molecules between the extracellular and intracellular milieu. Living organisms have evolved with highly sophisticated transport systems to control exchanges across this barrier: import of nutrients and fuel essential for their survival; recognition of chemical or physical messengers allowing information interchanges with surrounding cells...
December 19, 2017: Accounts of Chemical Research
F J Sayyed, G H Wadkar
OBJECTIVE: The present investigation was undertaken to assess the hypoglycemic potential of ethanolic (ECB) and aqueous extracts (ACB) of root bark of Caesalpinia bonducella using various in vitro techniques. METHOD: The ethanolic and aqueous extracts of root bark of C. bonducella were studied for their effects on glucose adsorption capacity, in vitro glucose diffusion, in-vitro amylolysis kinetics and glucose transport across membrane of yeast cells. RESULT: It was observed that the extracts under study adsorbed glucose and the adsorption of glucose increased remarkably with an increase in glucose concentration...
November 14, 2017: Annales Pharmaceutiques Françaises
Shunli Wan, Jiayu Wu, Shanshan Zhou, Rui Wang, Bin Gao, Feng He
Hydrated manganese oxide (HMO) nanoparticles were impregnated into a peanut shell-derived biochar (BC) to obtain a remarkable nanocomposite adsorbent, HMO-BC, which overcomes the technical barriers of singly applying either HMO or BC in practical heavy metal-containing wastewater treatment. HMO-BC can effectively sequestrate Pb(II) and Cd(II) in a wide pH range of 3-7 and exhibited more preferable sorption than bare BC in the presence of high-level competing cations. BC also significantly lowered the Mn leaching at acidic pH...
November 2, 2017: Science of the Total Environment
Jinsong He, Anan Cui, Shihuai Deng, J Paul Chen
Dye containing wastewater has increasingly become an important contamination due to operation of various industries such as textile industry. In this study, a micro-scale biochar particles/polysulfone mixed matrix hollow fiber membrane (MMM) was applied for the removal of methylene blue from water. The static and dynamic adsorption performance was investigated. We found that the MMM exhibited a high removal efficiency of methylene blue under a wide pH range of 4-10. The adsorption process on biochar and MMM obeyed the intraparticle surface diffusion model and Langmuir isotherm model...
February 15, 2018: Journal of Colloid and Interface Science
Bruno Degano, Thibaud Soumagne, Thomas Delaye, Patrick Berger, Thierry Perez, Alicia Guillien, Jean-Luc Pellegrin, David Launay, Nadine Magy-Bertrand, Christian Agard, Kiet Phong Tiev, Thông Hua-Huy, Catherine Tardiff, Véronique Diaz, Arnaud Chambellan, Anh Tuan Dinh-Xuan
Screening is important to determine whether patients with systemic sclerosis (SSc) have pulmonary hypertension because earlier pulmonary hypertension treatment can improve survival in these patients. Although decreased transfer factor of the lung for carbon monoxide (TLCO) is currently considered the best pulmonary function test for screening for pulmonary hypertension in SSc, small series have suggested that partitioning TLCO into membrane conductance (diffusing capacity) for carbon monoxide (DMCO) and alveolar capillary blood volume (VC) through combined measurement of TLCO and transfer factor of the lung for nitric oxide (TLNO) is more effective to identify pulmonary hypertension in SSc patients compared with TLCO alone...
October 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
Dilek Killi, Matthew Haworth
Quinoa (Chenopodium quinoa Willd.) has been proposed as a hardy alternative to traditional grain crops in areas with warm-to-hot climates that are likely to experience increased drought and salt stress in the future. We characterised the diffusive and metabolic limitations to photosynthesis in quinoa exposed to drought and salt stress in isolation and combination. Drought-induced pronounced stomatal and mesophyll limitations to CO₂ transport, but quinoa retained photosynthetic capacity and photosystem II (PSII) performance...
October 17, 2017: Plants (Basel, Switzerland)
I Asela, M Noyong, U Simon, J Andrades-Lagos, J Campanini-Salinas, D Vásquez-Velásquez, M Kogan, N Yutronic, R Sierpe
While 2-amino-4-(4-chlorophenyl)thiazole (AT) drug and thiazole derivatives have several biological applications, these compounds present some drawbacks, such as low aqueous solubility and instability. A new complex of βCD-AT has been synthesized to increase AT solubility and has been used as a substrate for the deposit of solid-state AuNPs via magnetron sputtering, thus forming the βCD-AT-AuNPs ternary system, which is stable in solution. Complex formation has been confirmed through powder X-ray diffraction and 1D and 2D nuclear magnetic resonance...
2017: PloS One
Anastasia Gabrielyan, Elena Neumann, Michael Gelinsky, Angela Rösen-Wolff
BACKGROUND: The main goal of bone tissue engineering has been the generation of healthy bone in order to replace affected tissue. Therefore, optimized biomaterials are needed which allow the survival and growth of mesenchymal stem cells. Until now the key challenge in the clinical application of cell-based tissue engineering bone implants was poor diffusion of oxygen into the tissue, making functional blood vessel networks a necessity. With their ability to evolve into different cell types, to expand extensively in vitro, and to release paracrine soluble factors, bone marrow stromal cells (BMSC) are highly attractive for tissue engineering...
September 29, 2017: Stem Cell Research & Therapy
Shaofei Wang, Yu Xie, Guangwei He, Qingping Xin, Jinhui Zhang, Leixin Yang, Yifan Li, Hong Wu, Yuzhong Zhang, Michael D Guiver, Zhongyi Jiang
Achieving high membrane performance in terms of gas permeance and carbon dioxide selectivity is an important target in carbon capture. Aiming to manipulate the channel affinity towards CO2 to implement efficient separations, gas separation membranes containing CO2 -philic and non-CO2 -philic nanodomains in the interlayer channels of graphene oxide (GO) were formed by intercalating poly(ethylene glycol) diamines (PEGDA). PEGDA reacts with epoxy groups on the GO surface, constructing CO2 -philic nanodomains and rendering a high sorption capacity, whereas unreacted GO surfaces give non-CO2 -philic nanodomains, rendering low-friction diffusion...
September 21, 2017: Angewandte Chemie
Kaiping Wang, Fang Cheng, Xianglin Pan, Tao Zhou, Xiqiu Liu, Ziming Zheng, Li Luo, Yu Zhang
To investigate the absorption and delivery of ASP in gastrointestinal (GI) tract, cASP was successfully synthesized by chemically modifying with succinic anhydride and then conjugating with a near infrared fluorescent dye Cy5.5. Then, the capacity of oral absorption of cASP was evaluated. The results demonstrated that cASP had low toxicity and no disruption on the integrity of cell membrane. The endocytosis of cASP into the epithelial cells was time- and energy-dependent, which was mediated by macropinocytosis pathway and clathrin- and caveolae (or lipid raft)-related routes...
November 2017: Drug Delivery
Tianye Zheng, Nora B Sutton, Pim de Jager, Richard Grosshans, Sirajum Munira, Annemieke Farenhorst
Wetlands in the Prairie Pothole Region of North America are integrated with farmland and contain mixtures of herbicide contaminants. Passive nonfacilitated diffusion is how most herbicides can move across plant membranes, making this perhaps an important process by which herbicide contaminants are absorbed by wetland vegetation. Prairie wetlands are dominated by native cattail (Typha latifolia) and hybrid cattail (Typha x glauca). The objective of this batch equilibrium study was to compare glyphosate absorption by the shoots and rhizomes of native versus hybrid cattails...
November 2017: Bulletin of Environmental Contamination and Toxicology
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