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https://www.readbyqxmd.com/read/28527471/the-electron-shuffle-cerium-influences-samarium-4f-orbital-occupancy-in-heteronuclear-ce-sm-oxide-clusters
#1
Jared O Kafader, Josey E Topolski, Vicmarie Marrero-Colon, Srinivasan S Iyengar, Caroline Chick Jarrold
The anion photoelectron (PE) spectra along with supporting results of density functional theory (DFT) calculations on SmO(-), SmCeOy(-), and Sm2Oy(-) (y = 1, 2) are reported and compared to previous results on CeO(-) [M. Ray et al., J. Chem. Phys. 142, 064305 (2015)] and Ce2Oy(-) (y = 1, 2) [J. O. Kafader et al., J. Chem. Phys. 145, 154306 (2016)]. Similar to the results on CexOy(-) clusters, the PE spectra of SmO(-), SmCeOy(-), and Sm2Oy(-) (y = 1, 2) all exhibit electronic transitions to the neutral ground state at approximately 1 eV e(-)BE...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28524602/elucidating-the-role-of-dissolution-in-ceo2-nanoparticle-plant-uptake-by-smart-radiolabeling
#2
Stefan Schymura, Thomas Fricke, Heike Hildebrand, Karsten Franke
The identification of major uptake pathways in plants is an important factor when evaluating the fate of manufactured nanoparticles in the environment and the associated risks. Using different radiolabeling techniques we were able to show a predominantly particulate uptake for CeO2 nanoparticles in contrast to a possible uptake in the form of ionic cerium.
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28514893/cytocompatible-polyion-complex-gel-of-poly-pro-hyp-gly-for-simultaneous-rat-bone-marrow-stromal-cell-encapsulation
#3
Farah Nurlidar, Mime Kobayashi, Kayo Terada, Tsuyoshi Ando, Masao Tanihara
Polyion complex (PIC) gel of poly(Pro-Hyp-Gly) was successfully fabricated by simply mixing polyanion and polycation derivatives of poly(Pro-Hyp-Gly), a collagen-like polypeptide. The polyanion, succinylated poly(Pro-Hyp-Gly), and the polycation, arginylated poly(Pro-Hyp-Gly), contain carboxy (pKa = 5.2) and guanidinium (pKa = 12.4) groups, respectively. Mixing the polyanion and the polycation at physiological pH (pH = 7.4) resulted in PIC gel. The hydrogel formation was optimum at an equimolar ratio of carboxy to guanidinium groups, suggesting that ionic interaction is the main determinant for the hydrogel formation...
May 18, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28504289/an-ionic-coordination-hybrid-hydrogel-for-bioseparation
#4
Zhen Liu, Zhijun Xia, Liuyin Fan, Hua Xiao, Chengxi Cao
An ionic coordination hybrid hydrogel is formed with ionic and covalent crosslinked networks via one-step copolymation. It is demonstrated that the hybrid crosslinker gel is used as a separation matrix for bioseparation, showing high separation efficiency, in contrast to traditional polyacrylamide gels. The hydrogel might serve as a novel matrix for bioseparation.
May 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28496044/comparison-of-nephrotoxicity-between-two-gadolinium-contrasts-gadodiamide-and-gadopentetate-in-patients-with-mildly-diminished-renal-failure
#5
Shokichi Naito, Hiromi Tazaki, Tomoko Okamoto, Kazuhiro Takeuchi, Shinichi Kan, Yasuo Takeuchi, Kouju Kamata
Although gadolinium (Gd)-based contrast media have been found to be nephrotoxic, their nephrotoxicity, and the dependence of nephrotoxicity on chelate types, have not been assessed in patients with normal or mildly diminished renal failure. This prospective, randomized study compared the nephrotoxicity of low doses of the nonionic Gd-based contrast medium gadodiamide (Omniscan®) and the ionic Gd-based contrast medium gadopentetate (Magnevist®) in patients with serum creatinine < 1.6 mg/dL. Patients aged 20 to 80 years, weighing 45 to 70 kg and with normal or < 1...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/28485592/analysis-of-prepeak-structure-of-concentrated-organic-lithium-electrolyte-by-means-of-neutron-diffraction-with-isotopic-substitution-and-molecular-dynamics-simulation
#6
Tsuyoshi Yamaguchi, Koji Yoshida, Toshio Yamaguchi, Yasuo Kameda, Kazutaka Ikeda, Toshiya Otomo
The prepeak structure of a 3 mol / kg solution of LiClO4 in propylene carbonate (PC) was studied by both neutron diffraction with isotopic substitution (NDIS) and molecular dynamics (MD) simulation. The NDIS data showed that the intensity of the prepeak decreases experimentally with increasing the scattering length of the lithium atom from (7)Li to (6)Li in PC-d6. On the other hand, although the prepeak was observed in solutions of both PC-d6 and PC-h6, it disappears when the 1:1 mixture of PC-d6 and PC-h6 was used as the solvent...
May 9, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28485581/electrochemical-sensing-of-neurotoxic-agents-based-on-their-electron-transfer-promotion-effect-on-an-au-electrode
#7
Hiroshi Shimada, Shiori Noguchi, Masahiro Yamamoto, Katsuhiko Nishiyama, Yusuke Kitamura, Toshihiro Ihara
An electrochemical molecular sensor based on a new principle is reported. Nereistoxin (NRT, 4-N,N-dimethylamino-1,2-dithiolane), a naturally occurring neurotoxin (nicotinic acetylcholine receptor agonist), was adsorbed on an Au electrode via Au-S covalent bonding and accelerated the electron transfer between the electrode and the marker, ferricyanide anion. The contrast between the electrochemical responses obtained with the bare and NRT-modified Au electrodes was more pronounced at a low ionic strength of the supporting electrolyte, KCl...
May 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28476885/small-teams-of-myosin-vc-motors-coordinate-their-stepping-for-efficient-cargo-transport-on-actin-bundles
#8
Elena B Krementsova, Ken'ya Furuta, Kazuhiro Oiwa, Kathleen M Trybus, M Yusuf Ali
Myosin Vc (myoVc) is unique among vertebrate class V myosin isoforms in that it requires teams of motors to move continuously on single actin filaments. Single molecules of myoVc cannot take multiple hand-over-hand steps from one actin binding site to the next without dissociating, in stark contrast to the well-studied myosin Va (myoVa) isoform. At low salt, single myoVc motors can, however, move processively on actin bundles, and at physiologic ionic strength, even teams of myoVc motors require actin bundles to sustain continuous motion...
May 5, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28475912/transport-of-multi-walled-carbon-nanotubes-stabilized-by-carboxymethyl-cellulose-and-starch-in-saturated-porous-media-influences-of-electrolyte-clay-and-humic-acid
#9
Bing Han, Wen Liu, Xiao Zhao, Zhengqing Cai, Dongye Zhao
This study investigated the transport behaviors of carboxymethyl cellulose (CMC) and starch stabilized multi-walled carbon nanotubes (MWNTs) through a saturated quartz sand column in the presence of electrolytes, model clays, and natural organic matter (humic acid) through column breakthrough experiments and model simulations. Both stabilizers, CMC and starch, greatly enhanced the breakthrough of MWNTs, with a full breakthrough plateau (C/C0) ranging from 0.69 to 0.90 at ionic strength from 0.3 to 10mM. Between the two stabilizers, CMC was more effective in resisting particle deposition, and thus CMC-stabilized MWNTs were more transportable through the medium...
May 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28463024/delayed-genital-blisters-following-iodixanol-administration
#10
Wen Zhang, Wei Yuan, Hai-Ling Yuan, Xiao-Lai Yang, Hua Xie
Iodixanol is a non-ionic contrast medium for general vascular use. The most common adverse effects from iodixanol include skin rashes, hives, erythema, itching, and angioedema. To date, there have been no reports of delayed genital blisters of iodixanol. In this report, we describe a patient in whom iodixanol induced delayed genital blisters one day after digital subtraction angiography.
May 2, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28460037/probing-the-salt-dependence-of-the-torsional-stiffness-of-dna-by-multiplexed-magnetic-torque-tweezers
#11
Franziska Kriegel, Niklas Ermann, Ruaridh Forbes, David Dulin, Nynke H Dekker, Jan Lipfert
The mechanical properties of DNA fundamentally constrain and enable the storage and transmission of genetic information and its use in DNA nanotechnology. Many properties of DNA depend on the ionic environment due to its highly charged backbone. In particular, both theoretical analyses and direct single-molecule experiments have shown its bending stiffness to depend on salt concentration. In contrast, the salt-dependence of the twist stiffness of DNA is much less explored. Here, we employ optimized multiplexed magnetic torque tweezers to study the torsional stiffness of DNA under varying salt conditions as a function of stretching force...
April 29, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28451677/an-optically-gated-aunp-dna-protonic-transistor
#12
Songming Peng, Amit Lal, Dan Luo, Yuerui Lu
Bio-interface transistors, which manipulate the transportation of ions (i.e. protons), play an important role in bridging physical devices with biological functionalities, because electrical signals are carried by ions/protons in biological systems. All available ionic transistors use electrostatic gates to tune the ionic carrier density, which requires complicated interconnect wires. In contrast, an optical gate, which offers the advantages of remote control as well as multiple light wavelength selections, has never been explored for ionic devices...
April 28, 2017: Nanoscale
https://www.readbyqxmd.com/read/28446585/activation-mechanism-of-a-neuromodulator-gated-pacemaker-ionic-current
#13
Michael Gray, Daniel Hector Daudelin, Jorge Golowasch
The neuromodulator-gated current (IMI) found in the crab stomatogastric ganglion is activated by neuromodulators that are essential to induce the rhythmic activity of the pyloric network in this system. One of these neuromodulators is also known to control the correlated expression of voltage-gated ionic currents in pyloric neurons as well as synaptic plasticity and strength. Thus, understanding the mechanism by which neuromodulator receptors activate IMI should provide insights not only into how oscillations are initiated, but also into how other processes, and currents not directly activated by them, are regulated...
April 26, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28443121/hormonal-and-nutritional-features-in-contrasting-rootstock-mediated-tomato-growth-under-low-phosphorus-nutrition
#14
Cristina Martínez-Andújar, Juan M Ruiz-Lozano, Ian C Dodd, Alfonso Albacete, Francisco Pérez-Alfocea
Grafting provides a tool aimed to increase low-P stress tolerance of crops, however, little is known about the mechanism (s) by which rootstocks can confer resistance to P deprivation. In this study, 4 contrasting groups of rootstocks from different genetic backgrounds (Solanum lycopersicum var. cerasiforme and introgression and recombinant inbred lines derived from the wild relatives S. pennellii and S. pimpinellifolium) were grafted to a commercial F1 hybrid scion and cultivated under control (1 mM, c) and P deficient (0...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28441500/thermoplasmonic-semitransparent-nanohole-electrodes
#15
Daniel Tordera, Dan Zhao, Anton V Volkov, Xavier Crispin, Magnus P Jonsson
Nonradiative decay of plasmons in metallic nanostructures offers unique means for light-to-heat conversion at the nanoscale. Typical thermoplasmonic systems utilize discrete particles, while metal nanohole arrays were instead considered suitable as heat sinks to reduce heating effects. By contrast, we show for the first time that under uniform broadband illumination (e.g., the sun) ultrathin plasmonic nanohole arrays can be highly competitive plasmonic heaters and provide significantly higher temperatures than analogous nanodisk arrays...
April 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28440374/electrotunable-lubricity-with-ionic-liquids-the-influence-of-nanoscale-roughness
#16
Alessio David, Oscar Y Fajardo, Alexei A Kornyshev, Michael Urbakh, Fernando Bresme
The properties of ionic liquids can be modified by applying an external electrostatic potential, providing a route to control their performance in nanolubrication applications. Most computational studies to date have focused on the investigation of smooth surfaces. Real surfaces are generally inhomogeneous and feature roughness of different length scales. We report here a study of the possible effects that surface roughness may have on electrotunable lubricity with ionic liquids, performed here by means of non-equilibrium molecular dynamics simulations...
April 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28437745/comparative-study-of-the-effects-of-gadolinium-chloride-and-gadolinium-based-magnetic-resonance-imaging-contrast-agent-on-freshwater-mussel-dreissena-polymorpha
#17
Houda Hanana, Patrice Turcotte, Chantale André, Christian Gagnon, François Gagné
Gadolinium (Gd), a metal of the lanthanide series used in various industrial and medical purposes is released into the aquatic environment. However, there are few aquatic toxicological studies addressing environmental effects of Gd which remains unknown in aquatic animals. Therefore, this study aimed to compare the effects of GdCl3 and a gadolinium-based MRI contrast agent (Omniscan), in zebra mussels after 28 days through a multibiomarker approach. Data revealed that after GdCl3 exposure, the mRNA level of metallothionein (MT) was modulated, those of cytochrome c oxidase (CO1) and superoxide dismutase (SOD) were increased, while gene expressions of catalase (CAT) and glutathione-S-transferase (GST) were downregulated...
April 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/28434231/charge-and-film-drainage-of-colliding-oil-drops-coated-with-the-nonionic-surfactant-c12e5
#18
Srinivas Mettu, Joseph D Berry, Raymond R Dagastine
The interaction forces between colliding tetradecane drops were measured in the presence of the nonionic surfactant pentaethylene glycol monododecyl ether (C12E5). The force behavior was measured in the range of premicellar compositions of the nonionic surfactant in various salt solutions and was consistent with the presence of a surface charge even though the surfactant was nonionic in nature. The surface potential of oil drops was found to decrease with an increase in C12E5 concentration. The measured electrophoretic mobilities and ζ potentials of emulsified tetradecane drops also decreased with an increase in the C12E5 concentration...
May 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28433008/nonlinear-permittivity-spectra-of-supercooled-ionic-liquids-observation-of-a-hump-in-the-third-order-permittivity-spectra-and-comparison-to-double-well-potential-models
#19
L N Patro, O Burghaus, B Roling
We have measured the third-order permittivity spectra ε3(3) of a monocationic and of a dicationic liquid close to the glass transition temperature by applying ac electric fields with large amplitudes up to 180 kV/cm. A peak ("hump") in the modulus of ε3(3) is observed for a mono-cationic liquid after subtraction of the dc contribution from the imaginary part of ε3(3). We show that the origin of this experimental "hump" is a peak in the imaginary part of ε3(3), with the peak height strongly increasing with decreasing temperature...
April 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28429615/regulation-of-vascular-large-conductance-calcium-activated-potassium-channels-by-nrf2-signalling
#20
Yong Li, Xiao-Li Wang, Xiaojing Sun, Qiang Chai, Jingchao Li, Benjamin Thompson, Win-Kuang Shen, Tong Lu, Hon-Chi Lee
BK channels are major ionic determinants of vasodilation. BK channel function is impaired in diabetic vessels due to accelerated proteolysis of its beta-1 (BK-β1) subunits in response to increased oxidative stress. The nuclear factor E2-related factor-2 (Nrf2) signalling pathway has emerged as a master regulator of cellular redox status, and we hypothesized that it plays a central role in regulating BK channel function in diabetic vessels. We found that Nrf2 expression was markedly reduced in db/db diabetic mouse aortas, and this was associated with significant downregulation of BK-β1...
April 1, 2017: Diabetes & Vascular Disease Research
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