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https://www.readbyqxmd.com/read/28231533/synthesis-characterization-and-dna-binding-cleavage-protein-binding-and-cytotoxicity-studies-of-co-ii-ni-ii-cu-ii-and-zn-ii-complexes-of-aminonaphthoquinone
#1
A Kosiha, C Parthiban, Kuppanagounder P Elango
The Co(II), Ni(II), Cu(II) and Zn(II) complexes of an aminonaphthoquinone ligand (L) have been prepared and characterized using analytical and spectral techniques. The structures of L and its Zn(II) complex are confirmed by single crystal X-ray diffraction study. The results indicate that Co(II), Ni(II) and Zn(II) complexes possess tetrahedral geometry while Cu(II) complex exhibits square planar structure. The interaction of L and its complexes with CT-DNA reveal that they could interact with CT-DNA through intercalation...
February 16, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28231004/ionic-intercalation-in-2d-van-der-waals-materials-in-situ-characterization-and-electrochemical-control-of-the-anisotropic-thermal-conductivity-of-black-phosphorus
#2
Joon Sang Kang, Ming Ke, Yongjie Hu
Two-dimensional van der Waals materials have shown novel fundamental properties and promise for wide applications. Here, we reported, for the first time, an experimental demonstration of the in-situ characterization and control of the anisotropic thermal conductivity of black phosphorus. We develop a novel platform based on lithium ion batteries that integrates ultrafast optical spectroscopy and electrochemical control to investigate the interactions between lithium ions and the lattices of the black phosphorus electrode...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#3
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230785/the-application-of-a-modified-d-roms-test-for-measurement-of-oxidative-stress-and-oxidized-high-density-lipoprotein
#4
Fumiaki Ito, Tomoyuki Ito, Chinatsu Suzuki, Tomoyo Yahata, Kazuyuki Ikeda, Kenji Hamaoka
Reactive oxygen species (ROS) are involved in the initiation and progression of atherosclerosis. ROS-derived hydroperoxides, as an indicator of ROS production, have been measured by using the diacron reactive oxygen metabolites (d-ROMs) test, which requires iron-containing transferrin in the reaction mixture. In this study we developed a modified d-ROMs test, termed the Fe-ROMs test, where iron ions were exogenously added to the reaction mixture. This modification is expected to exclude the assay variation that comes from different blood iron levels in individuals...
February 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28229957/origins-and-mechanisms-of-hysteresis-in-organometal-halide-perovskites
#5
Cheng Li, Antonio Guerrero, Yu Zhong, Sven Huettner
Inorganic-organic organometal halide perovskites, such as CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> or CsPbI<sub>3</sub>, etc., are an unprecedented rising star in the field of photovoltaics since 2009, owing to its exceptionally high power conversion efficiency (PCE) and simple fabrication processability. Despite its relatively short history of development, intensive investigations have been concentrating on this material, ranging from crystal structure analysis and photophysical characterization, to performance optimization and device integration, etc...
February 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28229601/enhanced-magnetization-of-cobalt-defect-clusters-embedded-in-tio2-%C3%AE-films
#6
David L Cortie, Yury Khaydukov, Thomas Keller, David John Sprouster, Jacob S Hughes, James P Sullivan, Xiaolin Wang, Anton P Le Brun, Joel Bertinshaw, Sara J Callori, Robert D Aughterson, Michael James, Peter J Evans, Gerry Triani, Frank Klose
High magnetizations are desirable for spintronic devices that operate by manipulating electronic states using built-in magnetic fields. However, the magnetic moment in promising dilute magnetic oxide nanocomposites is very low, typically corresponding to only fractions of a Bohr magneton for each dopant atom. In this study we report a large magnetization formed by ion implantation of Co into amorphous TiO2-δ films producing an inhomogenous magnetic moment, with certain regions producing over 2.5 µB per Co, depending on the local dopant concentration...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28229436/purification-and-characterization-of-a-novel-ubiquitin-like-antitumour-protein-with-hemagglutinating-and-deoxyribonuclease-activities-from-the-edible-mushroom-ramaria-botrytis
#7
Rong Zhou, Ya-Jie Han, Min-Hui Zhang, Ke-Ren Zhang, Tzi Bun Ng, Fang Liu
A novel ubiquitin-like antitumour protein (RBUP) was isolated from fruiting bodies of the edible mushroom Ramaria botrytis. The protein was isolated with a purification protocol involving ion exchange chromatography on DEAE-Sepharose fast flow and gel filtration on Sephadex G-75. SDS-PAGE, Native-PAGE and ultracentrifugation analysis disclosed that RBUP was a monomeric protein with a molecular weight of 18.5 kDa. ESI-MS/MS demonstrated that it shared 69% amino acid sequence similarity with Coprinellus congregates ubiquitin (gi|136667)...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28229435/design-and-pharmacodynamics-of-recombinant-nz2114-histidine-mutants-with-improved-activity-against-methicillin-resistant-staphylococcus-aureus
#8
Huixian Chen, Ruoyu Mao, Da Teng, Xiumin Wang, Ya Hao, Xingjun Feng, Jianhua Wang
NZ2114 is a promising candidate for therapeutic application owing to its potent activity to Staphylococcus aureus. Our objective was to identify NZ2114 derivatives with improved activity through substitution of His16 and His18 with residues Arginine and Lysine. Eight mutants were designed and expressed in Pichia pastoris X-33 via pPICZαA. Five of them exhibited strong antimicrobial activity against S. aureus at low minimal inhibitory concentrations (MICs) of 0.057-0.454 μM. Among them, H1, H2, and H3 showed ideal pharmacodynamic effects on methicillin-resistant S...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28228035/a-molecular-dynamics-investigation-of-the-influence-of-water-structure-on-ion-conduction-through-a-carbon-nanotube
#9
L Liu, G N Patey
Molecular dynamics simulations are employed to investigate pressure-driven water and ion transport through a (9,9) carbon nanotube (CNT). We consider NaCl solutions modeled with both the TIP3P and TIP4P/2005 water models. Concentrations range from 0.25 to 2.8 mol l(-1) and temperatures from 260 to 320 K are considered. We discuss the influences on flow rates of continuum hydrodynamic considerations and molecular structural effects. We show that the flow rate of water, sodium, and chloride ions through the CNT is strongly model dependent, consistent with earlier simulations of pure water conduction...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228032/structure-and-mechanisms-underlying-ion-transport-in-ternary-polymer-electrolytes-containing-ionic-liquids
#10
Santosh Mogurampelly, Venkat Ganesan
We use all atom molecular dynamics simulations to investigate the influence of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) ionic liquid on the structure and transport properties of poly(ethylene oxide) (PEO) polymer electrolytes doped with LiPF6 salt. We observe enhanced diffusivities of the Li(+), PF6(-), and BMIM(+) ions with increasing loading of the ionic liquid. Interplay between the different ion-ion and ion-polymer interactions is seen to lead to a destabilization of the Li-PF6 coordination and increase in the strength of association between the Li(+) cations and the polymer backbone...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28226463/cardiac-katp-channel-modulation-by-16hz-magnetic-fields-a-theoretical-study
#11
Yuval Aharonovich, Mickey Scheinowitz, Sharon Zlochiver, Yuval Aharonovich, Mickey Scheinowitz, Sharon Zlochiver, Yuval Aharonovich, Sharon Zlochiver, Mickey Scheinowitz
Heart exposure to 16Hz magnetic fields (MFs) was shown to be cardio-protective for diseased hearts; still, the mechanism of this effect is unknown. We hypothesize that a possible one mechanism is an increased trans-membrane KATP channel open probability due to modulation of the degree of dissociation between K(+) ions, having a resonance frequency of 16Hz, and the channel selectivity filter. The Fan-Makielski Markovian KATP channel model was adopted, and the MF bio-effect was manifested by modulating the open probability of the channel using the predictive MF bio-effect parameter based on Binhi's quantum mechanics model...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225605/electrostatic-control-of-regioselectivity-in-au-i-catalyzed-hydroarylation
#12
Vivian M Lau, William C Pfalzgraff, Thomas E Markland, Matthew W Kanan
Competing pathways in catalytic reactions often involve transition states with very different charge distributions, but this difference is rarely exploited to control selectivity. The proximity of a counterion to a charged catalyst in an ion paired complex gives rise to strong electrostatic interactions that could be used to energetically differentiate transition states. Here we investigate the effects of ion pairing on the regioselectivity of the hydroarylation of 3-substituted phenyl propargyl ethers catalyzed by cationic Au(I) complexes, which forms a mixture of 5- and 7-substituted 2H-chromenes...
February 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28225599/cubic-sr2scgao5-perovskite-structural-stability-oxygen-defect-structure-and-ion-conductivity-explored-on-single-crystals
#13
Serena Corallini, Monica Ceretti, Alain Cousson, Clemens Ritter, Marco Longhin, Philippe Papet, Werner Paulus
Oxygen-deficient Sr2ScGaO5 single crystals with a cubic perovskite structure were grown by the floating-zone technique. The transparent crystals of this pure 3D oxygen electrolyte are metastable at ambient temperature, showing one-sixth of all oxygen positions vacant. While neutron single-crystal diffraction, followed by maximum entropy analysis, revealed a strong anharmonic displacements for the oxygen atoms, a predominant formation of ScO6 octahedra and GaO4 tetrahedra is indicated by Raman spectroscopic studies, resulting in a complex oxygen defect structure with short-range order...
February 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28224917/regulation-of-the-wheat-map-kinase-phosphatase-1-by-14-3-3-proteins
#14
Mouna Ghorbel, Valérie Cotelle, Chantal Ebel, Ikram Zaidi, Mélanie Ormancey, Jean-Philippe Galaud, Moez Hanin
Plant MAP kinase phosphatases (MKPs) are major regulators of MAPK signaling pathways and play crucial roles in controlling growth, development and stress responses. The presence of several functional domains in plant MKPs such as a dual specificity phosphatase catalytic domain, gelsolin, calmodulin-binding and serine-rich domains, suggests that MKPs can interact with distinct cellular partners, others than MAPKs. In this report, we identified a canonical mode I 14-3-3-binding motif (574KLPSLP579) located at the carboxy-terminal region of the wheat MKP, TMKP1...
April 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28224394/native-like-and-denatured-cytochrome-c-ions-yield-cation-to-anion-proton-transfer-reaction-products-with-similar-collision-cross-sections
#15
Kenneth J Laszlo, John H Buckner, Eleanor B Munger, Matthew F Bush
The relationship between structures of protein ions, their charge states, and their original structures prior to ionization remains challenging to decouple. Here, we use cation-to-anion proton transfer reactions (CAPTR) to reduce the charge states of cytochrome c ions in the gas phase, and ion mobility to probe their structures. Ions were formed using a new temperature-controlled nanoelectrospray ionization source at 25 °C. Characterization of this source demonstrates that the temperature of the liquid sample is decoupled from that of the atmospheric pressure interface, which is heated during CAPTR experiments...
February 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28224152/charge-transfer-complexes-of-metal-free-phthalocyanine-radical-anions-with-decamethylmetallocenium-cations-cp-2co-h2pc%C3%AB-%C3%A2-solvent-and-cp-2cr-h2pc%C3%AB-%C3%A2-4c6h4cl2
#16
Dmitri V Konarev, Salavat S Khasanov, Manabu Ishikawa, Akihiro Otsuka, Hideki Yamochi, Gunzi Saito, Rimma N Lyubovskaya
Charge transfer complexes (Cp*2Co(+))(H2Pc˙(-))·0.5C6H4Cl2·0.7C6H5CN·0.3C6H14 (1) and (Cp*2Cr(+))(H2Pc˙(-))·4C6H4Cl2 (2) have been obtained as single crystals. Both complexes contain metal-free phthalocyanine (Pc) radical anions and decamethylmetallocenium cations. Reduction of the Pc macrocycle leads to the appearance of new bands at 1026-1030 nm in the NIR range and blue shifts of both Soret and Q-bands of H2Pc in the spectra of 1 and 2. The geometry of the Pc macrocycles supports the formation of H2Pc˙(-) by the alternation of shorter and longer C-N(imine) bonds in the macrocycles in 2...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28223944/il-1%C3%AE-induced-downregulation-of-the-multifunctional-pdz-adaptor-pdzk1-is-attenuated-by-erk-inhibition-rxr%C3%AE-or-ppar%C3%AE-stimulation-in-enterocytes
#17
Min Luo, Sunil Yeruva, Yongjian Liu, Giriprakash Chodisetti, Brigitte Riederer, Manoj B Menon, Keisuke Tachibana, Takefumi Doi, Ursula E Seidler
Background: The PDZ adaptor protein PDZK1 modulates the membrane expression and function of a variety of intestinal receptors and ion/nutrient transporters. Its expression is strongly decreased in inflamed intestinal mucosa of mice and IBD patients. Aim and Methods: We investigated whether the inflammation-associated PDZK1 downregulation is a direct consequence of proinflammatory cytokine release by treating intestinal Caco-2BBE cells with TNF-α, IFN-γ, and IL-1β, and analysing PDZK1 promotor activity, mRNA and protein expression...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28223844/neuronal-plasticity-of-trigeminal-ganglia-in-mice-following-nerve-injury
#18
Randi Lynds, Chuang Lyu, Gong-Wei Lyu, Xie-Qi Shi, Annika Rosén, Kamal Mustafa, Tie-Jun Sten Shi
BACKGROUND: Nerve injury may induce neuropathic pain. In studying the mechanisms of orofacial neuropathic pain, attention has been paid to the plastic changes that occur in the trigeminal ganglia (TGs) and nucleus in response to an injury of the trigeminal nerve branches. Previous studies have explored the impact of sciatic nerve injury on dorsal root ganglia (DRGs) and it has shown dramatic changes in the expression of multiple biomarkers. In large, the changes in biomarker expression in TGs after trigeminal nerve injury are similar to that in DRGs after sciatic nerve injury...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28223783/preparation-and-biosorption-evaluation-of-bacillus-subtilis-alginate-chitosan-microcapsule
#19
Ke Tong
The aim of this study was to assess the effect of alginate-chitosan microcapsule on viability characteristics of Bacillus subtilis and the ability of B. subtilis/alginate-chitosan microcapsule to remove uranium ion from aqueous solution. The effects of particle size, chitosan molecular weight and inoculum density on viability characteristics were studied using alginate-chitosan microcapsule-immobilized B. subtilis experiments. In addition, the effects of pH, immobilized spherule dosage, temperature, initial uranium ion concentration and contact time on removal of uranium ion were studied using batch adsorption experiments...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/28222598/drastic-compensation-of-the-electronic-and-solvation-effects-on-the-atp-hydrolysis-revealed-through-a-large-scale-qm-mm-simulations-combined-with-a-theory-of-solutions
#20
Hideaki Takahashi, Satoru Umino, Yuji Miki, Ryosuke Ishizuka, Shu Maeda, Akihiro Morita, Makoto Suzuki, Nobuyuki Matubayasi
Hydrolysis of adenosine triphosphate (ATP) is the "energy source" for a variety of biochemical processes. In the present work, we address key features of ATP hydrolysis: the relatively moderate value (about -10 kcal/mol) of the standard free energy ΔGhyd of reaction and the insensitivity of ΔGhyd to the number of excess electrons on ATP. We conducted quantum mechanical/molecular mechanical (QM/MM) simulation combined with the energy-representation theory of solutions to analyze the electronic-state and solvation contributions to ΔGhyd...
February 21, 2017: Journal of Physical Chemistry. B
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