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https://www.readbyqxmd.com/read/28335550/preparation-of-biodegradable-and-elastic-poly-%C3%AE%C2%B5-caprolactone-co-lactide-copolymers-and-evaluation-as-a-localized-and-sustained-drug-delivery-carrier
#1
Ji Hoon Park, Bo Keun Lee, Seung Hun Park, Mal Geum Kim, Jin Woo Lee, Hye Yun Lee, Hai Bang Lee, Jae Ho Kim, Moon Suk Kim
To develop a biodegradable polymer possessing elasticity and flexibility, we synthesized MPEG-b-(PCL-co-PLA) copolymers (PCxLyA), which display specific rates of flexibility and elasticity. We synthesize the PCxLyA copolymers by ring-opening polymerization of ε-caprolactone and l-lactide. PCxLyA copolymers of various compositions were synthesized with 500,000 molecular weight. The PCxLyA copolymers mechanical properties were dependent on the mole ratio of the ε-caprolactone and l-lactide components. Cyclic tensile tests were carried out to investigate the resistance to creep of PCxLyA specimens after up to 20 deformation cycles to 50% elongation...
March 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28335393/solvent-retention-capacities-of-oat-flour
#2
Qianwen Niu, Yu Pu, Xiaoping Li, Zhen Ma, Xinzhong Hu
This study measured the solvent retention capacities (SRCs) of flours from eight oat varieties and one wheat variety against different solvents to explore the swelling volume of oat flour with different solvents, and thus provide a theoretical basis for quick β-glucan analysis. The SRC profile consists of water SRC (WSRC), 50% sucrose SRC (SSRC), 5% lactic acid SRC (LASRC), 5% Na₂CO₃ SRC (SCASRC), NaCl SRC (SCSRC), CaCl₂ SRC (CCSRC), FeCl₃ SRC (FCSRC), sodium cholate SRC (SCHSRC), NaOH (pH 10) SRC (SHSRC), Na₂CO₃ (pH 10) SRC (SCABSRC) and SDS (pH 10) SRC (SDSSRC) values, and a Chopin SRC kit was used to measure the SRC value...
March 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28335207/synergistic-effect-of-functionalized-nanokaolin-decorated-mwcnts-on-the-performance-of-cellulose-acetate-ca-membranes-spectacular
#3
Amina Afzal, Muhammad Shahid Rafique, Nadeem Iqbal, Asif Ali Qaiser, Abdul Waheed Anwar, Sadia Sagar Iqbal
In order to enhance salt rejection level and high pressure mechanical integrity, functionalized nanokaolin decorated multiwall carbon nanotubes (FNKM, 0-5 wt % loading) were incorporated into a cellulose acetate (CA) matrix using high temperature solution mixing methodology. Scanning electron microscopy (SEM), X-ray diffraction technique (XRD), thermo-gravimetric analyzer (TGA) and Fourier transform infrared spectrometer (FTIR) were used to characterize the prepared membranes. The obtained results revealed that with increasing FNKM concentration in the host polymeric matrix, composite membrane's structural, functional, thermal, water permeation/flux and salt rejection characteristics were also modified accordingly...
April 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334521/organocatalyzed-synthesis-of-oleochemical-carbonates-from-co2-and-renewables
#4
Hendrik Büttner, Johannes Steinbauer, Christoph Wulf, Mehmet Dindaroglu, Hans-Günther Schmalz, Thomas Werner
Bifunctional phosphorus-based organocatalysts proved to be highly efficient for the atom-economic reaction of CO2 and epoxidized oleochemicals. Notably, those products are obtained from CO2 and renewable feedstocks only. Structure-activity relationships have been deduced from a screening of 22 organocatalysts in a test reaction. Bifunctional catalysts based on a phosphonium salt bearing a simple phenolic moiety proved to be extraordinarily active under comparatively mild and solvent-free reaction conditions...
March 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28334455/ceric-cyclopentadienides-bearing-alkoxy-aryloxy-chlorido-or-iodido-co-ligands
#5
Reiner Anwander, David Schneider, Frank Edelmann, Nicole Harmgarth
A series of heteroleptic tris(cyclopentadienyl) CeIV complexes has been isolated and crystallographically characterized, implying a broad accessibility of such organocerium(IV) compounds. The oxidation of complexes CpMe3Ce(thf) and Cp'3Ce(thf) (CpMe = C5H4Me, Cp' = C5H4SiMe3), bearing monosubstituted electron-poor cyclopentadienyl ligands, with either 0.5 equiv. 1,4-benzoquinone or C2Cl6 gave the cerium(IV) hydroquinolate and chloride complexes CpMe3Ce(OC6H4O)CeCpMe3, Cp'3Ce(OC6H4O)CeCp'3, as well as CpMe3CeCl and Cp'3CeCl, respectively...
March 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28334417/pharmacovigilance-database-search-discloses-clc-k-channels-as-a-novel-target-of-the-at1-receptor-blockers-valsartan-and-olmesartan
#6
Paola Imbrici, Domenico Tricarico, Giuseppe Felice Mangiatordi, Orazio Nicolotti, Marcello Diego Lograno, Diana Conte, Antonella Liantonio
BACKGROUND AND PURPOSE: Human ClC-K chloride channels are highly attractive targets for drug discovery for their physiological role and association with genetic disorders. These channels are pivotal in the kidney as they control chloride reabsorption and water diuresis. In addition, loss-of-function mutations of CLCKNB and BSND genes cause Bartter's syndrome (BS), whereas CLCNKA and CLCKNB gain-of-function polymorphisms predispose to a rare form of salt sensitive hypertension. Both disorders lack a personalized therapy that is in most cases only symptomatic...
March 23, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28334404/calcium-homeostasis-modulator-1-like-currents-in-rat-fungiform-taste-cells-expressing-amiloride-sensitive-sodium-currents
#7
Albertino Bigiani
Salt reception by taste cells is still the less understood transduction process occurring in taste buds, the peripheral sensory organs for the detection of food chemicals. Although there is evidence suggesting that the epithelial sodium channel (ENaC) works as sodium receptor, yet it is not clear how salt-detecting cells signal the relevant information to nerve endings. Taste cells responding to sweet, bitter, and umami substances release ATP as neurotransmitter through a nonvesicular mechanism. Three different channel proteins have been proposed as conduit for ATP secretion: pannexin channels, connexin hemichannels, and calcium homeostasis modulator 1 (CALHM1) channels...
March 10, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28334329/metabolomics-of-pichia-pastoris-impact-of-buffering-conditions-on-the-kinetics-and-nature-of-metabolite-loss-during-quenching
#8
Matthias Mattanovich, Hannes Rußmayer, Theresa Scharl-Hirsch, Verena Puxbaum, Jonas Burgard, Diethard Mattanovich, Stephan Hann
Mass spectrometry based metabolomic profiling is a powerful strategy to quantify the concentrations of numerous primary metabolites in parallel. To avoid distortion of metabolite concentrations, quenching is applied to stop the cellular metabolism instantly. For yeasts, cold methanol quenching is accepted to be the most suitable method to stop metabolism, while keeping the cells intact for separation from the supernatant. During this treatment, metabolite loss may occur while the cells are suspended in the quenching solution...
March 15, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28334315/ecological-factors-affecting-the-flight-phenology-of-the-endangered-coenonympha-nipisiquit-lepidoptera-nymphalidae
#9
Billie Chiasson, Gaétan Moreau
Coenonympha nipisiquit McDunnough (Lepidoptera: Nymphalidae) is an endemic butterfly species that has been recorded only in 10 salt marshes of eastern Canada. Despite obtaining the endangered status and benefiting from a conservation program, the populations of this species appear to be declining. However, a lack of information about the ecology of the species and current demographics undermines potential in-situ conservation efforts. To identify the environmental factors affecting the emergence phenology and flight period of this species, daily visual counts of adult C...
March 17, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28333466/covalent-modification-of-glassy-carbon-surfaces-by-electrochemical-grafting-of-aryl-iodides
#10
Line Koefoed, Steen U Pedersen, Kim Daasbjerg
The reduction of an aryl iodide is generally believed to involve a clean-cut two-electron reduction to produce an aryl anion and iodide. This is in contradiction to what is observed if a highly efficient grafting agent, such as an aryldiazonium salt, is employed. The difference in behavior is explained by the much more extreme potentials required for reducing an aryl iodide, which facilitates the further reduction of the aryl radical formed as an intermediate. However, in this study we disclose that electrografting of aryl iodides is indeed possible upon extended voltammetric cycling...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28333460/exceptional-structural-compliance-of-the-b12f12-2-superweak-anion
#11
Dmitry V Peryshkov, Steven H Strauss
The single-crystal X-ray structures, thermogravimetric analyses, and/or FTIR spectra of a series of salts of the B12F12(2-) anion and homoleptic Ag(L)n(+) cations are reported (L = CH2Cl2, n = 2; L = PhCH3, n = 3; L = CH3CN; n = 2-4; L = CO, n = 1, 2). The superweak-anion nature of B12F12(2-) (Y(2-)) was demonstrated by the rapid reaction of microcrystalline Ag2(Y) with 1 atm of CO to form a nonclassical silver(I) carbonyl compound with an FTIR ν(CO) band at 2198 cm(-1) (and with the proposed formula [Ag(CO)n]2[Y])...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28333168/metallic-reductant-free-synthesis-of-%C3%AE-substituted-propionic-acid-derivatives-through-hydrocarboxylation-of-alkenes-with-a-formate-salt
#12
Jun Takaya, Ko Miyama, Chuan Zhu, Nobuharu Iwasawa
A PGeP-pincer palladium-catalyzed hydrocarboxylation of styrenes to obtain pharmaceutically important α-arylpropionic acid derivatives was achieved using a formate salt as both a reductant and a CO2 source. The reaction was also applicable to vinylsulfone and acrylates. Isotope labeling experiments demonstrated that a CO2-recycling mechanism is operative through generation and reaction of a benzylpalladium complex as a carbon nucleophile. This protocol has realized a mild and atom economical CO2-fixation reaction without the necessity of using strong metallic reductants...
March 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28333059/solid-phase-extraction-of-trace-amounts-of-cadmium-ii-ions-in-water-and-food-samples-using-iron-magnetite-nanoparticles-modified-by-sodium-dodecyl-sulfate-and-2-mercaptobenzothiazole
#13
Shahriar Abbasi, Mehdi ShanbehDehbalai, Hossein Khani
A new, simple and rapid method for solid phase extraction and preconcentration of trace amounts of cadmium ions using 2-mercaptobenzothiazole/sodium dodecyl sulfate immobilized on magnetite nanoparticles (MBT-SDS-MNPs) was proposed. The method is based on the extraction of cadmium ions via complexation with MBT immobilized on SDS-coated MNPs and their determination by flame atomic absorption spectrometry. The effects of different parameters - pH; eluent type, concentration and volume; amounts of salt and adsorbent; contact time and interfering ions - on the adsorption of cadmium ions were studied...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332828/garnet-type-fast-li-ion-conductors-with-high-ionic-conductivities-for-all-solid-state-batteries
#14
Jian-Fang Wu, Wei Kong Pang, Vanessa K Peterson, Lu Wei, Xin Guo
All-solid-state Li-ion batteries with metallic Li anodes and solid electrolytes could offer superior energy density and safety over conventional Li-ion batteries. However, compared with organic liquid electrolytes, the low conductivity of solid electrolytes and large electrolyte/electrode interfacial resistance impede their practical application. Garnet-type Li-ion conducting oxides are amongst the most promising electrolytes for all-solid-state Li-ion batteries. In this work, the large radius Rb is doped at the La site of cubic Li6...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332402/small-molecule-polymer-composite-hole-transporting-layer-for-highly-efficient-and-stable-perovskite-solar-cells
#15
Jinmiao Wang, Zhao-Kui Wang, Meng Li, Ke-Hao Hu, Yingguo Yang, Yun Hu, Xingyu Gao, Liang-Sheng Liao
Effective and stable hole-transporting materials (HTMs) are necessary for obtaining excellent planar perovskite solar cells (PSCs). Herein, we reported a solution-processed composite HTM consisting of a polymer ploy(3,4-ethylene-dioxythiophene):ploystyrenesulfonate (PEDOT:PSS) and a small molecule copper phthalocyanine-3,4',4'',4'''-tetra-sulfonated acid tetra sodium salt (TS-CuPc) with optimized doping ratios. The composite HTM is crucial on account of not only enhancing the hole transport and extraction, but also improving the perovskite crystallization...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332396/salinity-dependent-contact-angle-alteration-in-oil-brine-silicate-systems-the-critical-role-of-divalent-cations
#16
Martin E J Haagh, Igor Siretanu, Michael H G Duits, Frieder Mugele
The effectiveness of water flooding oil recovery depends to an important extent on the competitive wetting of oil and water on the solid rock matrix. Here, we use macroscopic contact angle goniometry in highly idealized model systems to evaluate how brine salinity affects the balance of wetting forces and to infer the microscopic origin of the resulting contact angle alteration. We focus in particular on two competing mechanisms debated in the literature, namely double layer expansion and divalent cation bridging...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28332391/preparation-and-synthetic-utility-of-stable-1-3-enynyl-and-1-3-dienyl-aryl-iodonium-salts
#17
Eman Zawia, David J Hamnett, Wesley James Moran
The facile synthesis of stable enynyl- and dienyl(aryl)iodonium salts is achieved from terminal enynes. An X-ray crystal structure of an example of the latter is presented. These compounds are shown to be useful in a range of transformations.
March 23, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28332265/antidiuretic-and-antinatriuretic-response-to-high-salt-load-in-normotensive-wistar-kyoto-rats-role-of-alpha-1a-adrenoreceptors
#18
R N Kazi, M A Sattar, E J Johns
Altered renal adrenergic responses have been recognized as pathophysiological responses to high salt intake. This study aims to investigate the influence of 6 weeks of high salt diet on α1A -adrenoceptor regulation of renal tubular antinatriuretic and antidiuretic response in normal Wistar Kyoto rats. To achieve the above objective, antinatriuretic and antidiuretic response to phenylephrine was measured in the absence and presence of 5-methylurapidil (5-MeU) using the inulin clearance method. Systemic mean arterial blood pressure and renal haemodynamics were also measured simultaneously...
January 2017: Autonomic & Autacoid Pharmacology
https://www.readbyqxmd.com/read/28332082/detection-of-terrain-indices-related-to-soil-salinity-and-mapping-salt-affected-soils-using-remote-sensing-and-geostatistical-techniques
#19
Hela Triki Fourati, Moncef Bouaziz, Mourad Benzina, Samir Bouaziz
Traditional surveying methods of soil properties over landscapes are dramatically cost and time-consuming. Thus, remote sensing is a proper choice for monitoring environmental problem. This research aims to study the effect of environmental factors on soil salinity and to map the spatial distribution of this salinity over the southern east part of Tunisia by means of remote sensing and geostatistical techniques. For this purpose, we used Advanced Spaceborne Thermal Emission and Reflection Radiometer data to depict geomorphological parameters: elevation, slope, plan curvature (PLC), profile curvature (PRC), and aspect...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28331950/how-do-elevated-co2-and-nitrogen-addition-affect-functional-microbial-community-involved-in-greenhouse-gas-flux-in-salt-marsh-system
#20
Seung-Hoon Lee, Patrick J Megonigal, Hojeong Kang
Salt marshes are unique ecosystem of which a microbial community is expected to be affected by global climate change. In this study, by using T-RFLP analysis, quantitative PCR, and pyrosequencing, we comprehensively analyzed the microbial community structure responding to elevated CO2 (eCO2) and N addition in a salt marsh ecosystem subjected to CO2 manipulation and N addition for about 3 years. We focused on the genes of microbes relevant to N-cycling (denitrification and nitrification), CH4-flux (methanogens and methanotrophs), and S-cycling (sulfate reduction) considering that they are key functional groups involved in the nutrient cycle of salt marsh system...
March 22, 2017: Microbial Ecology
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