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https://www.readbyqxmd.com/read/28107728/a-three-dimensional-core-shell-nanostructured-composite-of-polypyrrole-wrapped-mno2-reduced-graphene-oxide-carbon-nanotube-for-high-performance-lithium-ion-batteries
#1
Yong Li, Daixin Ye, Wen Liu, Bin Shi, Rui Guo, Haijuan Pei, Jingying Xie
Manganese oxides are promising anode materials for their high-energy density. However, they suffer from poor rate capability and fast capacity fading. Herein, we construct a three-dimensional (3D) core-shell structured polypyrrole (PPy)/MnO2-reduced graphene oxide (rGO)-carbon nanotubes (CNTs) composite via a facile two-step method. In the structure, the CNTs can facilitate fast electron conduction and keep structural integrity. The flexible and conductive rGO nanosheets work as both a reactive material and a carrier for MnO2 in-situ growth...
January 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28106299/improved-and-general-manganese-catalyzed-n-methylation-of-aromatic-amines-using-methanol
#2
Jacob Neumann, Saravanakumar Elangovan, Anke Spannenberg, Kathrin Junge, Matthias Beller
A novel lutidine based manganese PNP pincer complex has been synthesized for the selective N methylation of aromatic amines with methanol. Using borrowing hydrogen methodology a selection of different functionalized aniline derivatives is methylated selectively in good yields.
January 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28106221/the-magnetoresistance-effect-in-a-conducting-molecular-crystal-consisting-of-dicyano-phthalocyaninato-manganese-iii
#3
Masaki Matsuda, Gosuke Yoshida, Jun-Ichi Yamaura, Tamotsu Inabe, Hiroyuki Tajima
A conducting molecular crystal TPP[Mn(III)(Pc)(CN)2]2 (Mn(III): d(4), S = 1, TPP = tetraphenylphosphonium and Pc = phthalocyanine) was fabricated. In its crystal structure, the [Mn(III)(Pc)(CN)2] units formed a one-dimensional regular chain along the c-axis with an overlap integral value of 8.6 × 10(-3). TPP[Mn(III)(Pc)(CN)2]2 showed a semiconducting behaviour that also has been observed for isostructural TPP[Co(III)(Pc)(CN)2]2 (Co(III): d(6), S = 0) and TPP[Fe(III)(Pc)(CN)2]2 (Fe(III): d(5), S = 1/2) whose ground states are charge-ordered states...
January 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28105341/changes-in-blood-concentrations-of-trace-metals-in-cancer-patients-receiving-cisplatin-based-chemotherapy
#4
Tsutomu Nakamura, Minoru Takahashi, Riho Niigata, Kazuhiko Yamashita, Manabu Kume, Midori Hirai, Hiroyuki Yasui
The administration of cisplatin (CDDP) may influence trace metal concentrations in body fluids. In order to test this hypothesis, the blood concentrations of trace metals were determined during the present study in eight Japanese esophageal and lung cancer patients receiving CDDP-based chemotherapy. The levels of manganese, iron (Fe), cobalt, copper, zinc (Zn), platinum and lead in the plasma were determined by inductively coupled plasma-mass spectrometry. In addition, the serum levels of Fe, transferrin and ferritin were evaluated...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28104559/distribution-of-heavy-metals-and-metalloids-in-bulk-and-particle-size-fractions-of-soils-from-coal-mine-brownfield-and-implications-on-human-health
#5
Hongxia Li, Hongbing Ji, Chunjing Shi, Yang Gao, Yan Zhang, Xiangyu Xu, Huaijian Ding, Lei Tang, Yuxin Xing
Heavy metals (HMs) and metalloids migrate into their surroundings, thus increasing environmental risks and threatening human health. Current studies on coal-mine brownfields, however, have not thoroughly investigated soil-associated HMs and metalloids produced by coal mining. Therefore, this study explored the spatial and particle fraction distribution and human health implications of HMs and metalloids. The soil-associated HMs and metalloids are Arsenic (As), Cadmium (Cd), Chromium (Cr), Copper (Cu), Mercury (Hg), Manganese (Mn), Nickel (Ni), Lead (Pb), Scandium (Sc), Titanium (Ti) and Zinc (Zn)...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28103776/small-and-hungry-micrornas-in-micronutrient-homeostasis-of-plants
#6
Prashanti Patel, Karuna Yadav, Thumballi Ramabhatta Ganapathi
MicroRNAs are emerging players in plant development and response to stresses, both biotic and abiotic such as micronutrient deficiency. These small RNAs regulate cognate downstream targets either by transcript cleavage or translational inhibition. Micronutrient deficiencies lead to poor quality and yield of crops and impaired human health. Over the years several microRNAs have been identified which regulate expression of genes controlling uptake, mobilization and homeostasis of macronutrients such as nitrogen, phosphorus and sulfur to ensure sufficiency without toxicity...
January 17, 2017: MicroRNA
https://www.readbyqxmd.com/read/28103306/a-superoxide-dismutase-capable-of-functioning-with-iron-or-manganese-promotes-the-resistance-of-staphylococcus-aureus-to-calprotectin-and-nutritional-immunity
#7
Yuritzi M Garcia, Anna Barwinska-Sendra, Emma Tarrant, Eric P Skaar, Kevin J Waldron, Thomas E Kehl-Fie
Staphylococcus aureus is a devastating mammalian pathogen for which the development of new therapeutic approaches is urgently needed due to the prevalence of antibiotic resistance. During infection pathogens must overcome the dual threats of host-imposed manganese starvation, termed nutritional immunity, and the oxidative burst of immune cells. These defenses function synergistically, as host-imposed manganese starvation reduces activity of the manganese-dependent enzyme superoxide dismutase (SOD). S. aureus expresses two SODs, denoted SodA and SodM...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28102914/nano-koosh-balls-of-mesoporous-mno2-improved-supercapacitor-performance-through-superior-ion-transport
#8
Aasheesh Srivastava, Qysar Maqbool, Chanderpratap Singh, Priyajit Jash, Amit Paul
Manganese dioxide nanomaterials with "Koosh-ball" like morphology (MnO2-KBs) as well as worm-like nanotubes (MnO2-NWs) were obtained by employing Tween 20 as the reducing-cum-structure-directing agent, and KMnO4 as a MnO2 precursor. While the MnO2-KBs were interconnected with each other through tubular extensions, MnO2-NWs were largely disconnected. Both MnO2-KBs and MnO2-NWs had large BET surface areas (>200 m2/g), and were thermally robust upto 300 ⁰C. The electrochemical studies revealed that the highest specific capacitance (Csp) obtained for MnO2-KBs was significantly higher (272 F/g) than that of MnO2-NWs (129 F/g)...
January 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28102423/synthesis-and-solution-stability-of-water-soluble-%C3%AE%C2%BA-2-n-%C3%AE%C2%BAo-bis-3-5-dimethylpyrazolyl-ethanol-manganese-i-tricarbonyl-bromide-corm-onn1
#9
Ralf Mede, Juliane Traber, Moritz Klein, Helmar Görls, Guido Gessner, Patrick Hoffmann, Michael Schmitt, Jürgen Popp, Stefan H Heinemann, Ute Neugebauer, Matthias Westerhausen
The reaction of (OC)5MnBr with bis(3,5-dimethyl-1-pyrazolyl)methane yields [{(Pz(Me2))2CH2}Mn(CO)3Br] (1). The use of tridentate heteroscorpionates such as bis(3,5-dimethyl-1-pyrazolyl)acetic acid and 2,2-bis(3,5-dimethyl-1-pyrazolyl)ethanol leads to the formation of mononuclear [(OC)3Mn{(Pz(Me2))2CH-CO2}] (2) and [(OC)3Mn{(Pz(Me2))2CH-CH2OH}]Br (3, CORM-ONN1). Salt-like photoCORM 3 is soluble in aqueous media up to a concentration of 200 μM, non-toxic up to an approx. 65 μM solution and releases all carbonyl ligands upon irradiation...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28101711/catalytic-performance-of-graphene-bimetallic-composite-for-heterogeneous-oxidation-of-acid-orange-7-from-aqueous-solution
#10
Jiebing Li, Asif Hussain, Dengxin Li, Ming Yang, Shihong Xu
In this study, reduced graphene oxide (rGO) embedded with bimetallic nanoparticles of cobalt-manganese oxide (CoMn2O4) was fabricated by hydrothermal treatment. The obtained product was characterized and applied for the heterogeneous activation of peroxymonosulfate (PMS) to degrade acid orange 7 (AO7). The characterization results revealed that 10-20 nm nanosized CoMn2O4 was homogenously decorated on the surface of rGO. The effect of different CoMn2O4 loadings showed that catalyst with a CoMn2O4 contents higher than 20% performs stronger capability for catalytic degradation of AO7 compared to pure CoMn2O4...
January 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28100855/trace-elements-as-an-activator-of-antioxidant-enzymes
#11
Marta Wołonciej, Elżbieta Milewska, Wiesława Roszkowska-Jakimiec
Oxidative stress is a state of impaired balance between the formation of free radicals and antioxidant capacity of the body. It causes many defects of the body, e.g. lipid peroxidation, DNA and protein damage. In order to prevent the effects of oxidative stress, the organism has developed defence mechanisms. These mechanisms capture and inhibit the formation of free radicals and also chelate ion metals that catalyse free radical reactions. Trace elements are components of antioxidant enzymes involved in antioxidant mechanisms...
December 31, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28099509/a-comparative-study-on-antioxidant-system-in-fish-hepatopancreas-and-intestine-affected-by-choline-deficiency-different-change-patterns-of-varied-antioxidant-enzyme-genes-and-nrf2-signaling-factors
#12
Pei Wu, Yang Liu, Wei-Dan Jiang, Jun Jiang, Juan Zhao, Yong-An Zhang, Xiao-Qiu Zhou, Lin Feng
The liver and intestine are susceptible to the oxidative damage which could result in several diseases. Choline deficiency induced oxidative damage in rat liver cells. Thus, this study aimed to investigate the potential molecular mechanisms responsible for choline deficiency-induced oxidative damage. Juvenile Jian carp were fed diets differing in choline content [165 (deficient group), 310, 607, 896, 1167 and 1820 mg/kg diet] respectively for 65 days. Oxidative damage, antioxidant enzyme activities and related gene expressions in the hepatopancreas and intestine were measured...
2017: PloS One
https://www.readbyqxmd.com/read/28099021/location-of-methanol-on-the-s2-state-mn-cluster-in-photosystem-ii-studied-by-proton-matrix-electron-nuclear-double-resonance
#13
Hiroki Nagashima, Hiroyuki Mino
Proton matrix electron nuclear double resonance (ENDOR) spectroscopy was performed to specify the location of the methanol molecule near the manganese cluster in photosystem II. Comparison of the ENDOR spectra in the presence of CH3OH and CD3OH revealed two pairs of hyperfine couplings, 1.2 MHz for A⊥ and 2.5 MHz for A//, arising from the methyl group in methanol. On the basis of the crystal structure, the possible location of methanol close to the manganese cluster was discussed.
January 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28096460/occupancy-of-the-zinc-binding-site-by-transition-metals-decreases-the-substrate-affinity-of-the-human-dopamine-transporter-by-an-allosteric-mechanism
#14
Yang Li, Felix P Mayer, Peter S Hasenhuetl, Verena Burtscher, Klaus Schicker, Harald H Sitte, Michael Freissmuth, Walter Sandtner
The human dopamine transporter (DAT) has a tetrahedral Zn(2+)-binding site. Zn(2+)-binding sites are also recognized by other first row transition metals. Excessive accumulation of manganese or of copper can lead to Parkinsonism due to dopamine deficiency. Accordingly, we examined the effect of Mn(2+), Co(2+), Ni(2+) and Cu(2+)on transport-associated currents through DAT and DAT-H193K, a mutant with a disrupted Zn(2+)-binding site. All transition metals - but Mn(2+) - modulated the transport cycle of wild type DAT with affinities in the low µM range...
January 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28095372/impaired-mitochondrial-respiration-in-large-cerebral-arteries-of-rats-with-type-2-diabetes
#15
Ivan Merdzo, Ibolya Rutkai, Venkata N L R Sure, Catherine A McNulty, Prasad V G Katakam, David W Busija
Mitochondrial dysfunction has been suggested as a potential underlying cause of pathological conditions associated with type 2 diabetes (T2DM). We have previously shown that mitochondrial respiration and mitochondrial protein levels were similar in the large cerebral arteries of insulin-resistant Zucker obese rats and their lean controls. In this study, we extend our investigations into the mitochondrial dynamics of the cerebral vasculature of 14-week-old Zucker diabetic fatty obese (ZDFO) rats with early T2DM...
January 18, 2017: Journal of Vascular Research
https://www.readbyqxmd.com/read/28094922/nano-photoelectrochemical-cell-arrays-with-spatially-isolated-oxidation-and-reduction-channels
#16
Hang-Ah Park, Siyuan Liu, Youngseok Oh, Paul A Salvador, Gregory S Rohrer, Mohammad F Islam
Photoelectrochemical conversion of solar energy is explored for many diverse applications but suffers from poor efficiencies due to limited solar absorption, inadequate charge carrier separation, redox half-reactions occurring in close proximity, and/or long ion diffusion lengths. We have taken a drastically different approach to the design of photoelectrochemical cells (PECs) to spatially isolate reaction sites at the nanoscale to different materials and flow channels, suppressing carrier recombination and back-reaction of intermediates while shortening ion diffusion paths and, importantly, avoiding mixed product generation...
January 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28094520/synthesis-crystal-structure-magnetic-properties-and-stability-of-the-manganese-rich-mn3alc-%C3%AE%C2%BA-phase
#17
Hannes Dierkes, Jan van Leusen, Dimitri Bogdanovski, Richard Dronskowski
κ-carbides of varying composition, seemingly responsible for age hardening in high-Al steel alloys, have been detected to precipitate both at grain boundaries and in the bulk grain of steels. Herein we report the bulk-phase synthesis of "Mn3AlC" by arc plasma sintering and rapid solidification. Single crystals have been found suitable for X-ray diffraction using Mo radiation and yield a lattice parameter of a = 3.875(2) Å. We find a mixed occupation of the 1a position by Al and Mn, which, together with the C position being fully occupied, leads to the actual composition Mn3...
January 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28092849/magnesium-and-manganese-affect-photosynthesis-essential-oil-composition-and-phenolic-compounds-of-tanacetum-parthenium
#18
Soudeh Farzadfar, Fatemeh Zarinkamar, Mostafa Hojati
The accumulation of plant defense metabolites is closely associated with the concentration of nutrient elements, yet data related to the interactive effects of two nutrients on the deployment of phenolics and terpenoids are scare. In the present study, the interaction between magnesium (Mg) and manganese (Mn) on nutrient uptake, photosynthesis, oxidative status and the accumulation of phenolics and terpenoids in the leaves of feverfew plants grown at different concentrations of Mg and Mn was investigated. Nutrient uptake and photosynthesis were associated with the amount of applied Mg but could be modified by the concentration of Mn...
January 3, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28092742/short-term-in-vivo-exposure-to-graphene-oxide-can-cause-damage-to-the-gut-and-testis
#19
Marta Dziewięcka, Julia Karpeta-Kaczmarek, Maria Augustyniak, Magdalena Rost-Roszkowska
Graphene oxide (GO) has unique physicochemical properties and also has a potentially widespread use in every field of daily life (industry, science, medicine). Demand for nanotechnology is growing every year, and therefore many aspects of its toxicity and biocompatibility still require further clarification. This research assesses the in vivo toxicity of pure and manganese ion-contaminated GO that were administrated to Acheta domesticus with food (at 200mgkg(-1) of food) throughout their ten-day adult life...
January 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28092161/estimation-of-ellagic-acid-and-or-repaglinide-effects-on-insulin-signaling-oxidative-stress-and-inflammatory-mediators-of-liver-pancreas-adipose-tissue-and-brain-in-insulin-resistant-type-2-diabetic-rats
#20
Mohamed M Amin, Mahmoud S Arbid
Even though ellagic acid has previously been valued in many models of cancer, so far its full mechanistic effect as a natural antiapoptotic agent in the prevention of type 2 diabetes complications has not been completely elucidated, which was the goal of this study. We fed albino rats a high-fat fructose diet (HFFD) for 2 months to induce insulin resistance/type 2 diabetes and then treated the rats with ellagic acid (10 mg/kg body weight, orally) and/or repaglinide (0.5 mg/kg body weight, orally) for 2 weeks...
October 21, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
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