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https://www.readbyqxmd.com/read/28339180/a-study-of-oxygen-evolution-reaction-catalytic-behavior-of-coxni1-xfe2o4-in-alkaline-medium
#1
Viruthasalam Maruthapandian, Mahendran Mathankumar, Velu Saraswathy, Balasubramanian Subramanian, Srinivasan Muralidharan
Catalysts for the oxygen evolution reaction (OER) play an important role in the conversion of solar energy to fuel of earth abundant water into H2 and O2 through splitting/electrolyzer. The heterogeneous electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) exhibit catalytic activity that depends on the electronic properties, oxidation states and local surface structure. Spinel ferrites (MFe2O4; M = Ni and Co) based materials have been attractive for the catalytic water oxidation due to their well-known stability in alkaline medium, easy synthesis, existence of metal cations with various oxidation states, low cost and tunable properties by the desired metal substitution...
March 24, 2017: ACS Applied Materials & Interfaces
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/28331217/geographic-distribution-of-cadmium-and-its-interaction-with-the-microbial-community-in-the-longjiang-river-risk-evaluation-after-a-shocking-pollution-accident
#3
MingJiang Zhang, FuKe Huang, GuangYuan Wang, XingYu Liu, JianKang Wen, XiaoSheng Zhang, YaoSi Huang, Yu Xia
A shocking Longjiang River cadmium pollution accident occurred in 2012, the effects of which on microbial communities remain unclear. Alkaline precipitation technology was applied for remediation, but concerns rose about the stability of this technology. To understand the geographic distribution of cadmium and its correlation with microbes, in this study, 39 water samples and 39 sludge samples from this river and 2 soil samples from the nearby farmland were collected for chemical and microbial analyses. The Cd concentrations of all water samples were lower than 0...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28330211/cellulase-production-using-natural-medium-and-its-application-on-enzymatic-hydrolysis-of-thermo-chemically-pretreated-biomass
#4
Shivani Sharma, Vinay Sharma, Arindam Kuila
Lignocellulosic bioethanol is an important renewable fuel for transportation purpose. Commercial production of lignocellulosic bioethanol mainly depends on cost of cellulase production, efficient pretreatment and enzymatic hydrolysis process. In the present study cellulase production from Aspergillus niger under submerged fermentation (SmF) was optimized using coconut water as natural medium. Maximum cellulase production (0.53 IU/mL) was achieved within 3 days of incubation using 8 % (w/v) waste paper and 0...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28320540/effect-of-using-different-vehicles-on-the-physicochemical-antimicrobial-and-biological-properties-of-white-mineral-trioxide-aggregate
#5
Bruno Cavalini Cavenago, Aldo Enrique Del Carpio-Perochena, Ronald Ordinola-Zapata, Carlos Estrela, Gustavo Pompermaier Garlet, Mario Tanomaru-Filho, Paulo Henrique Weckwerth, Flaviana Bombarda de Andrade, Marco Antonio Hungaro Duarte
INTRODUCTION: This study evaluated the physicochemical, antimicrobial, and biological properties of white mineral trioxide aggregate (MTA) mixed with aqueous and propylene glycol extracts of Arctium lappa L. and Casearia sylvestris Sw. METHODS: The setting-time test was performed according to American Society for Testing and Materials 266/2008 and flowability by American National Standards Institute/American Dental Association 57/2012 standard specifications. The following parameters were assessed: volumetric change by micro-computed tomography; pH level and calcium ion release measured after 3 hours and 1, 3, 7, and 15 days; antimicrobial effect by the dentin decontamination method with intratubular Enterococcus faecalis viability, verified by using confocal laser scanning microscopy; and biocompatibility by histologic-morphometric analyses of inflammatory infiltrate at subcutaneous implant sites after 15, 30, and 60 days...
March 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28319373/morphology-controllable-synthesis-of-zn-co-mixed-sulfide-nanostructures-on-carbon-fiber-paper-towards-efficient-rechargeable-zinc-air-batteries-and-water-electrolysis
#6
Xiaoyu Wu, Xiaopeng Han, Xiaoya Ma, Wei Zhang, Yida Deng, Cheng Zhong, Wenbin Hu
It remains an ongoing challenge to develop cheap, highly active and stable electrocatalysts to promote the sluggish electrocatalytic oxygen evolution, oxygen reduction, and hydrogen evolution reactions for rechargeable metal-air batteries and water-splitting systems. In this work, we report the morphology-controllable synthesis of zinc cobalt mixed sulfide (Zn-Co-S) nanoarchitectures, including nanosheets, nanoplates, and nanoneedles, grown on conductive carbon fiber paper (CFP) and the micro-nanostructure dependent electrochemical efficacy for catalyzing hydrogen and oxygen in zinc-air batteries and water electrolysis...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28316339/uv-mediated-thiol-ene-click-reactions-for-the-synthesis-of-drug-loadable-and-degradable-gels-based-on-copoly-2-oxazoline-s
#7
Klaus P Luef, Charlotte Petit, Bettina Ottersböck, Gernot Oreski, Francis Ehrenfeld, Bruno Grassl, Stéphanie Reynaud, Frank Wiesbrock
An 80-membered library of gels composed of monofunctional 2-ethyl-2-oxazoline and 2-nonyl-2-oxazoline and one of four selected difunctional 2-oxazolines (containing either ether or ester bonds) were synthesized by microwave-assisted ring-opening polymerizations. The difunctional 2-oxazolines were prepared from the thiol-ene reaction of glycol dimercaptoacetate or 2,2'-(ethylenedioxy)diethanethiol and 2-but-3'-enyl-2-oxazoline or 2-dec-9'-enyl-2-oxazoline. 53 of the gels exhibited glass-transition temperatures, which ranged from -5...
April 2017: European Polymer Journal
https://www.readbyqxmd.com/read/28315381/alfa-helix-to-beta-sheet-transition-in-long-chain-poly-l-lysine-formation-of-alfa-helical-fibrils-by-poly-l-lysine
#8
Katarzyna Cieślik-Boczula
The temperature-induced α-helix to β-sheet transition in long-chain poly-l-lysine (PLL), accompanied by the gauche-to-trans isomerization of CH2 groups in the hydrocarbon side chains of Lys amino acid residues, and formation of β-sheet as well as α-helix fibrillar aggregates of PLL have been studied using Fourier-transform infrared (FT-IR) and vibrational circular dichroism (VCD) spectroscopy, and transmission electron microscopy (TEM). In a low-temperature alkaline water solution or in a methanol-rich water mixture, the secondary structure of PLL is represented by α-helical conformations with unordered and gauche-rich hydrocarbon side chains...
March 14, 2017: Biochimie
https://www.readbyqxmd.com/read/28301502/long-term-moderate-wind-induced-sediment-resuspension-meeting-phosphorus-demand-of-phytoplankton-in-the-large-shallow-eutrophic-lake-taihu
#9
Jian-Ying Chao, Yi-Min Zhang, Ming Kong, Wei Zhuang, Long-Mian Wang, Ke-Qiang Shao, Guang Gao
The objective of this study was to investigate the impact of sediment resuspension and phosphorus (P) release on phytoplankton growth under different kinds of wind-wave disturbance conditions in the large and shallow eutrophic Lake Taihu in China. Short-term strong wind (STSW) conditions, long-term moderate wind (LTMW) conditions, and static/calm conditions were investigated. To address this objective, we (1) monitored changes in surface water P composition during field-based sediment resuspension caused by STSW conditions in Lake Taihu, and also conducted (2) a series of laboratory-based sediment resuspension experiments to simulate LTMW and calm conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28301286/chlorine-dioxide-oxidation-of-escherichia-coli-in-water-a-study-of-the-disinfection-kinetics-and-mechanism
#10
Isaac Ofori, Suresh Maddila, Johnson Lin, Sreekantha B Jonnalagadda
This study investigated the kinetics and mechanism of chlorine dioxide (ClO2) inactivation of a Gram-negative bacteria Escherichia coli (ATCC 35218) in oxidant demand free (ODF) water in detail as a function of disinfectant concentration (0.5-5.0 mg/L), water pH (6.5-8.5), temperature variations (4-37°C) and bacterial density (10(5)-10(7) cfu/mL). The effects of ClO2 on bacterial cell morphology, outer membrane permeability, cytoplasmic membrane disruption and intracellular enzymatic activity were also studied to elucidate the mechanism of action on the cells...
March 16, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28300010/effect-of-dietary-supplementation-of-ligustrum-lucidum-on-performance-egg-quality-and-blood-biochemical-parameters-of-hy-line-brown-hens-during-the-late-laying-period
#11
X L Li, W L He, M L Yang, Y M Yan, Y H Xue, S T Zhao
The fruit of Ligustrum lucidum (FLL, Nuzhenzi in Chinese) is an important traditional medicine, and have attracted significant research attention because of their various biological activities. However, there are few research reports available on the use of FLL as a feed additive in livestock nutrition, particularly in layers. This study was conducted to determine the effects of supplementation of the diet of laying hens with FLL on laying performance, egg quality and blood metabolites. A total of 360 72-week-old hens were allocated to three dietary treatments (eight replications of 15 hens/treatment group) and were fed either a control diet or a diet supplemented with an inclusion level of 0...
March 16, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28296136/one-step-in-situ-growth-of-iron-nickel-sulfide-nanosheets-on-feni-alloy-foils-high-performance-and-self-supported-electrodes-for-water-oxidation
#12
Cheng-Zong Yuan, Zhong-Ti Sun, Yi-Fan Jiang, Zheng-Kun Yang, Nan Jiang, Zhi-Wei Zhao, Umair Yaqub Qazi, Wen-Hua Zhang, An-Wu Xu
Efficient and durable oxygen evolution reaction (OER) catalysts are highly required for the cost-effective generation of clean energy from water splitting. For the first time, an integrated OER electrode based on one-step direct growth of metallic iron-nickel sulfide nanosheets on FeNi alloy foils (denoted as FeNi3 S2 /FeNi) is reported, and the origin of the enhanced OER activity is uncovered in combination with theoretical and experimental studies. The obtained FeNi3 S2 /FeNi electrode exhibits highly catalytic activity and long-term stability toward OER in strong alkaline solution, with a low overpotential of 282 mV at 10 mA cm(-2) and a small Tafel slope of 54 mV dec(-1) ...
March 10, 2017: Small
https://www.readbyqxmd.com/read/28295716/nicop-nanoarray-a-superior-pseudocapacitor-electrode-with-high-areal-capacitance
#13
Menglai Kong, Zao Wang, Weiyi Wang, Min Ma, Danni Liu, Shuai Hao, Rongmei Kong, Gu Du, Abdullah M Asiri, Yadong Yao, Xuping Sun
High-performance supercapacitors require the design and development of electrode materials with high conductivity and a large electrolyte-accessible surface area. Here, the use of a conductive NiCoP nanoarray on nickel foam (NiCoP/NF) as a superior pseudocapacitor electrode is demonstrated. This 3D electrode exhibits high areal capacitances of 9.2 and 5.97 F cm(-2) at current densities of 2 and 50 mA cm(-2) , respectively, with good rate capability and cycling stability. The asymmetric supercapacitor (ASC) device assembled using NiCoP/NF as positive electrode and active carbon as negative electrode delivers a high energy density of 1...
February 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28295694/water-based-synthesis-of-palladium-trigonal-bipyramidal-tetrahedral-nanocrystals-with-enhanced-electrocatalytic-oxidation-activity
#14
Changshuai Shang, Wei Hong, Yaxiao Guo, Jin Wang, Erkang Wang
In this paper, well-defined palladium trigonal bipyramidal/tetrahedral nanocrystals were synthesized by an aqueous-phase hydrothermal method. The final products were a mixture of trigonal bipyramidal and tetrahedral nanocrystals. Statistics indicated that there were more trigonal bipyramidal than tetrahedral in the products. Ethylenediamine tetraacetic acid disodium salt (EDTA-2Na) was proved to be essential in controlling the final shapes of palladium nanocrystals. Some control experiments were also conducted to investigate the shape evolution and formation mechanisms...
March 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28295465/quantification-of-piritramide-in-human-colostrum
#15
A Van Eeckhaut, P Vanfleteren, J Van Schoors, Y Van Wanseele, J Poelaert, Y Michotte
WHAT IS KNOWN AND OBJECTIVE: In our university hospital (UZBrussel), one of the options to control post-operative pain after a Caesarean section under general anaesthesia is to administer piritramide by patient-controlled intravenous analgesia (PCIA). As no information is available about the possible transfer of this synthetic narcotic analgesic into breastmilk, women are frequently advised not to breastfeed their newborn. A sensitive liquid chromatographic (LC) method coupled with UV detection will therefore be developed and validated for the quantification of piritramide in colostrum samples to evaluate the presence of the analgesic in the first milk...
March 13, 2017: Journal of Clinical Pharmacy and Therapeutics
https://www.readbyqxmd.com/read/28294264/iron-cobalt-bimetal-oxide-nanorods-as-efficient-and-robust-water-oxidation-catalysts
#16
Xichen Zhou, Jingwei Huang, Fuming Zhang, Yukun Zhao, Yan Zhang, Yong Ding
Cobalt-based oxides are considered as potential water oxidation catalysts for future artificial photosynthetic systems because of their high abundance, strong stability and efficient performance. Herein, a series of cobalt-based oxides, MnCo3-nO4 (M = Mn, Fe, Co) samples, were synthesized through changing the metal sources by a low-temperature coprecipitation method. These catalysts were investigated under photochemical and electrochemical water oxidation conditions. And they all exhibited efficient activity for water oxidation under alkaline, acidic and neutral conditions under visible light irradiation...
March 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28294221/novel-design-of-highly-110-oriented-barium-titanate-nanorod-array-and-its-application-in-nanocomposite-capacitors
#17
Lingmin Yao, Zhongbin Pan, Jiwei Zhai, Haydn H D Chen
Nanocomposites in capacitors combining highly aligned one dimension ferroelectric nanowires with polymer would be more desirable for achieving higher energy density. However, the synthesis of the well-isolated ferroelectric oxide nanorod arrays with a high orientation has been rather scant, especially using glass-made substrates. In this study, a novel design that is capable of fabricating a highly [110]-oriented BaTiO3 (BT) nanorod array was proposed first, using a three-step hydrothermal reaction on glass-made substrates...
March 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28293815/selectivity-improvement-for-spectrofluorimetric-determination-of-oseltamivir-phosphate-in-human-plasma-and-in-the-presence-of-its-degradation-product
#18
Mahmoud A Omar, Sayed M Derayea, Islam M Mostafa
A simple and sensitive spectrofluorimetric method has been developed and validated for determination of oseltamivir phosphate (OSP). The proposed method is based on condensation reaction of the primary amino group of OSP with ninhydrin and phenylacetaldehyde in buffered medium (pH 6.5). The formed yellow fluorescent product exhibits excitation and emission maxima at 390 and 460 nm, respectively. The selectivity improvement of our proposed method is based on the water insolubility of the oseltamivir carboxylic acid (OSC) the active metabolite of OSP, which contains the same primary amino group as OSP but cannot, condensed with ninhydrin and phenylacetaldehyde reagents...
March 14, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28291734/safety-assessment-of-the-aqueous-extract-of-the-flowers-of-nymphaea-lotus-linn-nymphaeaceae-acute-neuro-and-subchronic-oral-toxicity-studies-in-albinos-wistar-rats
#19
Mireille Kameni Poumeni, Danielle Claude Bilanda, Paul Désiré Dzeufiet Djomeni, Yolande Sandrine Mengue Ngadena, Marguerite Francine Mballa, Madeleine Chantal Ngoungoure, Agnès Carolle Ouafo, Théophile Dimo, Pierre Kamtchouing
BACKGROUND: Nymphaea lotus Linn (N. lotus) is a medicinal plant widely used in Cameroon popular medicine, to treat neuropsychiatric conditions, male sexual disorders or as food supplement. However, scientific data on the pharmacotoxic profile of this plant are not available. The safety of N. lotus was assessed in acute, neuro- and subchronic toxicity studies by following the OECD guidelines. Effectively, no data have been published until now in regard to its safety on the nervous system...
March 14, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28291319/molybdenum-carbide-embedded-nitrogen-doped-porous-carbon-nanosheets-as-electrocatalysts-for-water-splitting-in-alkaline-media
#20
Chenbao Lu, Diana Tranca, Jian Zhang, Fermı N Rodrı Guez Hernández, Yuezeng Su, Xiaodong Zhuang, Fan Zhang, Gotthard Seifert, Xinliang Feng
Molybdenum carbide (Mo2C) based catalysts were found to be one of the most promising electrocatalysts for hydrogen evolution reaction (HER) in acid media in comparison with Pt-based catalysts but were seldom investigated in alkaline media, probably due to the limited active sites, poor conductivity, and high energy barrier for water dissociation. In this work, Mo2C-embedded nitrogen-doped porous carbon nanosheets (Mo2C@2D-NPCs) were successfully achieved with the help of a convenient interfacial strategy. As a HER electrocatalyst in alkaline solution, Mo2C@2D-NPC exhibited an extremely low onset potential of ∼0 mV and a current density of 10 mA cm(-2) at an overpotential of ∼45 mV, which is much lower than the values of most reported HER electrocatalysts and comparable to the noble metal catalyst Pt...
March 20, 2017: ACS Nano
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