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https://www.readbyqxmd.com/read/28544958/impact-of-triblock-copolymers-on-the-biophysical-function-of-naturally-derived-lung-surfactant
#1
Moritz Beck-Broichsitter, Christian A Ruge, Adam Bohr
The current study aimed at investigating the general applicability of triblock copolymers consisting of poly(ethylene glycol) and poly(propylene glycol) (Pluronic(®)) as excipients for lung delivery. After thorough physicochemical characterization of the diverse polymers, their cytotoxicity was evaluated using alveolar epithelial cells. Next, a naturally-derived lung surfactant was challenged with the distinct triblock copolymers with respect to changes in microstructure, adsorption to the air/liquid interface and dynamic surface tension behavior under bubble pulsation...
May 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544635/a-robust-water-based-functional-binder-framework-for-high-energy-lithium-sulfur-batteries
#2
Matthew James Lacey, Viking Österlund, Fabian Jeschull, Andreas Bergfelt, Tim Bowden, Daniel Brandell
We report here a water-based functional binder framework for the lithium-sulfur battery system, based on the general combination of a polyether and an amide-containing polymer. These binders are applied here to positive electrodes optimised towards high energy electrochemical performance based only on commercially available materials. Electrodes with up to 4 mAh cm-2 capacity and 97 - 98% coulombic efficiency are achievable in electrodes with a 65% total sulfur content and a poly(ethylene oxide):poly(vinylpyrrolidone) (PEO:PVP) binder system...
May 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544623/amphoteric-ion-exchange-membranes-with-significantly-improved-vanadium-barrier-properties-for-all-vanadium-redox-flow-batteries
#3
Olga Nibel, Tomasz Rojek, Thomas J Schmidt, Lorenz Gubler
All-vanadium redox flow batteries (VRBs) have attracted considerable interest as promising energy storage devices which can allow the efficient utilization of renewable energy sources. The membrane, which separates the porous electrodes in a redox flow cell, is one of the key components in VRBs. High rates of cross-over of vanadium ions and water through the membrane impair the efficiency and capacity of a VRB. Thus, membranes with low permeation rate of vanadium species and water are required, also characterized by low resistance and stability in the VRB environment...
May 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544571/reactivity-of-copper-iii-oxo-complexes-in-the-gas-phase
#4
Ghazaleh Yassaghi, Erik Andris, Jana Roithová
We show an efficient way to generate [(L)CuO]+ complexes with a number of monodentate and bidentate ligands L from their [(L)Cu(ClO3)]+ precursors by electrospray ionization. Further, we studied [(L)CuO]+ with L = 9,10-phenanthraquinone, 1,10-phenanthroline and acetonitrile in detail. The signature of these terminal copper-oxo complexes is elimination of the oxygen atom upon collisional activation. We have investigated and compared their reactions with water, ethane, ethylene and 1,4-cyclohexadiene. The [(CH3CN)CuO]+ complex can oxidize water and perform C-H activation and hydroxylation of ethane...
May 22, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28544434/strain-stiffening-hydrogels-through-self-assembly-and-covalent-fixation-of-semi-flexible-fibers
#5
Rint P Sijbesma, Marcos Fernandez-Castano Romera, Clément Guibert, Ilja K Voets, Cornelis Storm
Biomimetic, strain-stiffening materials are reported, made through self-assembly and covalent fixation of small building blocks to form fibrous hydrogels able to stiffen by an order of magnitude in response to applied stress. The gels consist of semi-flexible rodlike micelles of bisurea bolaamphiphiles with oligo(ethylene oxide) (EO) outer blocks and a polydiacetylene (PDA) backbone. The micelles are fibers composed of 9-10 ribbons. A gelation method based on Cu-catalyzed azide-alkyne cycloaddition (CuAAC) was developed that leads to strain-stiffening hydrogels with unusual yet universal linear and nonlinear stress-strain response...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543880/the-role-of-the-co-activation-and-ligand-functionalization-in-neutral-methallyl-nickel-ii-catalysts-for-oligomerization-and-polymerization-of-ethylene
#6
Daniela E Ortega, Diego Cortés-Arriagada, Oleksandra S Trofymchuk, Diana Yepes, Soledad Gutierrez-Oliva, René S Rojas, Alejandro Toro-Labbe
It is presented a detailed quantum chemical study analyzing the mechanism of ethylene oligomerization and polymerization by means of a family of four neutral methallyl NiII catalysts. The role of the boron co-activators [BF₃ or B(C₆F₅)₃] and ligand functionalization (in ortho or para position of the N-arylcyano moiety of the catalysts) was investigated to explain the chain length of the obtained polymers. The chain initialization proceeds with higher activation barriers for the ortho functionalized complexes (19 kcal mol¯¹) compared to the para isomers (17-18 kcal mol¯¹)...
May 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543776/a-surface-molecularly-imprinted-polymer-as-chiral-stationary-phase-for-chiral-separation-of-1-1-binaphthalene-2-naphthol-racemates
#7
Hongxing Dong, Danxia Zhang, Hailong Lin, Yudan Wang, Lijia Liu, Meixia Zheng, Xiaobo Li, Chunhong Zhang, Junqing Li, Peng Zhang, Juhyok So
Acrylamide (AM) was copolymerized with ethylene glycol dimethacrylate (EGDMA) in the presence of (R)-1,1'-binaphthalene-2-naphthol (BINOL) as the template molecules on the surface of silica gel by a free radical polymerization to produce a chiral stationary phase based on the surface molecularly imprinted polymer (SMIP-CSP). The SMIP-CSP showed a much better separation factor (α = 4.28) than the CSP based on the molecularly imprinted polymer (MIP-CSP) without coating on the silica gel (α = 1.96) during the chiral separation of BINOL enantiomers by high-performance liquid chromatography...
May 25, 2017: Chirality
https://www.readbyqxmd.com/read/28543054/mitogen-activated-protein-kinases-and-calcium-dependent-protein-kinases-are-involved-in-wounding-induced-ethylene-biosynthesis-in-arabidopsis-thaliana
#8
Sen Li, Xiaofei Han, Liuyi Yang, Xiangxiong Deng, Hongjiao Wu, Mengmeng Zhang, Yidong Liu, Shuqun Zhang, Juan Xu
Ethylene, an important hormone in plant growth, development, and response to environmental stimuli, is rapidly induced by mechanical injury or wounding. Although induction of ACS (1-aminocyclopropane-1-carboxylic acid synthase) gene expression has been associated with this process, the detailed regulatory mechanism is unclear. Here, we report that the wounding-induced ethylene production is modulated by both mitogen-activated protein kinase (MAPK) pathway and calcium-dependent protein kinase (CPK) pathway. Study using acs mutants demonstrated that four ACS isoforms, including ACS2, ACS6, ACS7, and ACS8, contribute to ethylene production in response to wounding...
May 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28542545/a-first-insight-into-the-involvement-of-phytohormones-pathways-in-coffee-resistance-and-susceptibility-to-colletotrichum-kahawae
#9
Inês Diniz, Andreia Figueiredo, Andreia Loureiro, Dora Batista, Helena Azinheira, Vítor Várzea, Ana Paula Pereira, Elijah Gichuru, Pilar Moncada, Leonor Guerra-Guimarães, Helena Oliveira, Maria do Céu Silva
Understanding the molecular mechanisms underlying coffee-pathogen interactions are of key importance to aid disease resistance breeding efforts. In this work the expression of genes involved in salicylic acid (SA), jasmonic acid (JA) and ethylene (ET) pathways were studied in hypocotyls of two coffee varieties challenged with the hemibiotrophic fungus Colletotrichum kahawae, the causal agent of Coffee Berry Disease. Based on a cytological analysis, key time-points of the infection process were selected and qPCR was used to evaluate the expression of phytohormones biosynthesis, reception and responsive-related genes...
2017: PloS One
https://www.readbyqxmd.com/read/28542282/expression-patterns-of-members-of-the-ethylene-signaling-related-gene-families-in-response-to-dehydration-stresses-in-cassava
#10
Meng Yun Ren, Ren Jun Feng, Hou Rui Shi, Li Fang Lu, Tian Yan Yun, Ming Peng, Xiao Guan, Heng Zhang, Jing Yi Wang, Xi Yan Zhang, Cheng Liang Li, Yan Jun Chen, Peng He, Yin Dong Zhang, Jiang Hui Xie
Drought is the one of the most important environment stresses that restricts crop yield worldwide. Cassava (Manihot esculenta Crantz) is an important food and energy crop that has many desirable traits such as drought, heat and low nutrients tolerance. However, the mechanisms underlying drought tolerance in cassava are unclear. Ethylene signaling pathway, from the upstream receptors to the downstream transcription factors, plays important roles in environmental stress responses during plant growth and development...
2017: PloS One
https://www.readbyqxmd.com/read/28541511/molecular-association-of-arabidopsis-rth-with-its-homolog-rte1-in-regulating-ethylene-signaling
#11
Fangfang Zheng, Xiankui Cui, Maximo Rivarola, Ting Gao, Caren Chang, Chun-Hai Dong
The plant hormone ethylene affects many biological processes during plant growth and development. Ethylene is perceived by ethylene receptors at the endoplasmic reticulum (ER) membrane. The ETR1 ethylene receptor is positively regulated by the transmembrane protein RTE1, which localizes to the ER and Golgi apparatus. The RTE1 gene family is conserved in animals, plants, and lower eukaryotes. In Arabidopsis, RTE1-HOMOLOG (RTH) is the only homolog of the Arabidopsis RTE1 gene family. The regulatory function of the Arabidopsis RTH in ethylene signaling and plant growth is largely unknown...
May 24, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28541048/monoanionic-bis-pyrazolyl-methylborate-ph3b-ch-3-5-ch3-2pz-2-as-a-supporting-ligand-for-copper-i-ethylene-cis-2-butene-and-carbonyl-complexes
#12
Shawn G Ridlen, Naveen V Kulkarni, H V Rasika Dias
The monoanionic bidentate ligand [(Ph3B)CH(3,5-(CH3)2Pz)2)](-) has been prepared from lithium bis(pyrazolyl)methanide and triphenylborane. This useful new ligand is closely related to the well-established bis(pyrazolyl)borate and bis(pyrazolyl)methane ligands but has key differences to both analogues as well. The ethylene, cis-2-butene, and carbon monoxide adducts [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(L) (where L = C2H4, cis-CH3HC═CHCH3, and CO) have been prepared from [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF), copper(I) triflate, and the corresponding coligand...
May 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28540174/a-preliminary-study-on-the-interaction-between-asn-gly-arg-ngr-modified-multifunctional-nanoparticles-and-vascular-epithelial-cells
#13
Chunxi Liu, Tingxian Liu, Xiaoyue Yu, Yizhu Gu
Previously developed Asn-Gly-Arg (NGR) peptide-modified multifunctional poly(ethyleneimine)-poly(ethylene glycol) (PEI-PEG)-based nanoparticles (TPIC) have been considered to be promising carriers for the co-delivery of DNA and doxorubicin (DOX). As a continued effort, the aim of the present study was to further evaluate the interaction between TPIC and human umbilical vein endothelial cells (HUVEC) to better understand the cellular entry mechanism. In the present investigation, experiments relevant to co-localization, endocytosis inhibitors and factors influencing the internalization were performed...
May 2017: Acta Pharmaceutica Sinica. B
https://www.readbyqxmd.com/read/28539046/a-facile-chip-based-array-monolithic-microextraction-system-online-coupled-with-icpms-for-fast-analysis-of-trace-heavy-metals-in-biological-samples
#14
Jing Zhang, Beibei Chen, Han Wang, Man He, Bin Hu
Trace heavy metals have great impact on biological system, therefore, it is essential to develop suitable analytical methods for the determination of trace heavy metals in biological samples to elucidate their biochemical and physiological functions in organisms. Herein, we presented a chip-based array monolithic microextraction system and combined it with inductively coupled plasma mass spectrometry (ICPMS) for online analysis of trace Hg, Pb and Bi in real-world biological samples. Six ethylenediamine modified poly glycidyl methacrylate-co-ethylene glycol dimethacrylate (poly (GMA-co-EDMA-NH2)) capillary monolithic columns were embedded parallelly in microchannels of a microfluidic chip for array monolithic microextraction...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28537751/using-neutron-reflectometry-to-characterize-antimicrobial-protein-surface-coatings
#15
Peter W Akers, Andrew J Dingley, Simon Swift, Andrew R J Nelson, Julie Martin, Duncan James McGillivray
Understanding the interaction of adsorbed or covalently immobilized proteins with solid substrates at the molecular level guides the successful design of functionalized surfaces used in biomedical applications. In this report, neutron reflectometry (NR) was used to characterize the structure of surface-attached antimicrobial protein films, with antimicrobial activity assessed using an adaption of the Japanese Industrial Standard Test JIS Z 2801. NR allowed parameters influencing bioactivity to be measured at nanometer resolution and for conclusions about structural characteristics relating to bioactivity to be drawn...
May 24, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28537705/hypoxia-responsive-19-f-mri-probes-with-improved-redox-properties-and-biocompatibility
#16
Da Xie, Seyong Kim, Vikraant Kohli, Arnab Banerjee, Meng Yu, José S Enriquez, Jeffrey J Luci, Emily L Que
(19)F magnetic resonance imaging (MRI), an emerging modality in biomedical imaging, has shown promise for in vitro and in vivo preclinical studies. Here we present a series of fluorinated Cu(II)ATSM derivatives for potential use as (19)F magnetic resonance agents for sensing cellular hypoxia. The synthesized complexes feature a hypoxia-targeting Cu(2+) coordination core, nine equivalent fluorine atoms connected via a variable-length poly(ethylene glycol) linker. Introduction of the fluorine moiety maintains the planar coordination geometry of the Cu(2+) center, while the linker length modulates the Cu(2+/+) reduction potential, (19)F NMR relaxation properties, and lipophilicity...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537535/ethephon-increases-photosynthetic-nitrogen-use-efficiency-proline-and-antioxidant-metabolism-to-alleviate-decrease-in-photosynthesis-under-salinity-stress-in-mustard
#17
Noushina Iqbal, Shahid Umar, Tasir S Per, Nafees A Khan
Salinity is a serious threat to plant growth and development worldwide reducing agricultural productivity each year. Ethylene is an important phytohormone that affects plants performance under normal and abiotic stress conditions. In this study, role of ethylene was investigated in mitigating salinity stress (100 mM NaCl) effects on photosynthesis in mustard plants subjected to different nitrogen (N; 5 and 10 mM) levels. Plants under salinity stress exhibited marked increase in proline and reduced glutathione (GSH) content and activity of antioxidant enzymes...
May 24, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28537474/erf-vii-members-exhibit-synergistic-and-separate-roles-in-arabidopsis
#18
Yuan Yao, Xiaoyang Chen, Ai-Min Wu
The ethylene response factor VII (ERF-VII) transcription factor has been reported to be involved in multiple different stress responses. In a previous study, we showed that ERF74 and ERF75 play a redundant role in the upregulation of RESPIRATORY BURST OXIDASE HOMOLOG D (RbohD) transcription and enhance the oxygen species (ROS) burst during early stages of the stress response. Induction of stress marker genes and ROS-scavenging enzymes under various stress conditions are dependent on this ROS burst. Here, we propose an assumption that ERF71-ERF75 have different functions and act synergistically in response to stresses in Arabidopsis...
May 24, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28537379/molecular-rhodium-complexes-supported-on-the-metal-oxide-like-nodes-of-metal-organic-frameworks-and-on-zeolite-hy-catalysts-for-ethylene-hydrogenation-and-dimerization
#19
Varinia Bernales, Dong Yang, Jun Yu, Gamze Gümüşlü, Christopher J Cramer, Bruce C Gates, Laura Gagliardi
Metal-organic frameworks (MOFs) with nodes consisting of zirconium oxide clusters (Zr6) offer new opportunities as supports for catalysts with well-defined, essentially molecular, structures. We used the precursor Rh(C2H4)2(acac) (acac is acetylacetonate) to anchor Rh(I) complexes to the nodes of the MOF UiO-67 and, for comparison, to the zeolite dealuminated HY (DAY). These were characterized experimentally by measurement of catalytic activities and selectivities for ethylene hydrogenation and dimerization in a once-through flow reactor at 298 K and 1 bar...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537298/vibrational-and-impedance-spectroscopic-analyses-of-semi-interpenetrating-polymer-networks-as-solid-polymer-electrolytes
#20
Nimai Bar, Pratyay Basak, Yoed Tsur
Semi-interpenetrating polymer networks (semi-IPNs) with significant ionic conductivity (10(-4) S cm(-1) at ambient temperature) were studied by vibrational and impedance spectroscopies coupled with advanced analysis procedures. Vibrational spectroscopy recognized the numbers of free ions, ion pairs, ion-polymers and hydrogen bonds within the solid polymer electrolyte matrices (SPE). Electrochemical impedance spectroscopy (EIS) was used to quantify the bulk resistance and bulk relaxation time. The analyses used discrepancy-complexity plots to assess the number of free parameters properly, and EIS was further analyzed using impedance spectroscopy genetic programming (ISGP)...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
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