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Amanda Denniss, Angela F Dulhunty, Nicole A Beard
Calcium release from internal stores is a quintessential event in excitation-contraction coupling in cardiac and skeletal muscle. The ryanodine receptor Ca2+ release channel is embedded in the internal sarcoplasmic reticulum Ca2+ store, which releases Ca2+ into the cytoplasm, enabling contraction. Ryanodine receptors form the hub of a macromolecular complex extending from the extracellular space to the sarcoplasmic reticulum lumen. Ryanodine receptor activity is influenced by the integrated effects of associated co-proteins, ions, and post-translational phosphor and redox modifications...
May 15, 2018: International Journal of Biochemistry & Cell Biology
Chao Han, Weiguang Li, Chengyao Hua, Fengqing Sun, Pengsheng Bi, Qunqing Wang
Enzymatic saccharification of lignocellulosic biomass is increasingly applied in agricultural and industrial applications. Nevertheless, low performance in the extreme environment severely prevents the utilization of commercial enzyme preparations. To obtain cellobiohydrolases with improved catalytic activity and thermostability, structure-based rational design was performed based on a thermostable cellobiohydrolase CtCel6 from Chaetomium thermophilum. In the present study, four conserved and noncatalytic residue substitutions were generated via site-directed mutagenesis...
May 15, 2018: International Journal of Biological Macromolecules
Yury Yu Rusakov, Irina L Rusakova, Leonid B Krivdin
Four-component DFT calculations of 31 P NMR chemical shifts have been performed for the representative series of 56 phosphine chalcogenides in order to investigate an influence of different functional groups on the heavy atom relativistic effect on the NMR chemical shifts of light phosphorous atoms (HALA effect). The validity of the four-component DFT approach used for the wide-scale calculations of the phosphorous chemical shifts in a wide series of phosphine chalcogenides has been confirmed on a small series of 5 representative compounds with the aid of high-quality CCSD calculations taking into account solvent, vibrational and the relativistic corrections in comparison with the experiment...
May 18, 2018: Magnetic Resonance in Chemistry: MRC
Xiaofei Shi, Zhihao Wang, Toshiaki Takei, Xuejiao Wang, Qi Zhu, Xiaodong Li, Byung-Nam Kim, Xudong Sun, Ji-Guang Li
Hydrothermal reaction at 200 °C was systematically undertaken in wide ranges of solution pH (4-13) and W/La molar ratio ( R = 0.5-2), without using any organic additive, to investigate the effect of hydrothermal parameter on product property and the underlying mechanism. Combined analysis by X-ray diffraction (XRD), inductively coupled plasma (ICP) spectroscopy, elemental mapping, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that either a decreasing pH or increasing R value yielded a product richer in W and, conversely, richer in La...
May 18, 2018: Inorganic Chemistry
Y Chae, M Yang, J R Kim
AIM: To investigate the release of growth factors into the root canal space after various final irrigants during regenerative endodontic procedures. The residual cytotoxic effect of final irrigants on stem cells from the apical papilla (SCAP) was also examined. METHODOLOGY: To measure the release of TGF-β1, root segments (8mm long) were irrigated with 1.5% NaOCl followed by 20 mL of final irrigants; Saline, 17% EDTA, 10% citric acid, 10% or 37% phosphoric acid...
May 17, 2018: International Endodontic Journal
Francesco Piacenza, Antje Biesemeier, Marco Farina, Francesco Piva, Xin Jin, Eleonora Pavoni, Lorenzo Nisi, Maurizio Cardelli, Laura Costarelli, Robertina Giacconi, Andrea Basso, Elisa Pierpaoli, Mauro Provinciali, James C M Hwang, Antonio Morini, Andrea di Donato, Marco Malavolta
Exosomes are nanovesicles known to mediate intercellular communication. Although it is established that zinc ions can act as intracellular signaling factors, the measurement of zinc in circulating nanovesicles has not yet been attempted. Providing evidence of the existence of this zinc fraction and methods for its measurement might be important to advance our knowledge of zinc status and its relevance in diseases. Exosomes from 0.5 ml of either fresh or frozen human plasma were isolated by differential centrifugation...
July 2018: Journal of Trace Elements in Medicine and Biology
Akram El Kateb, Claudio Stalder, Andres Rüggeberg, Christoph Neururer, Jorge E Spangenberg, Silvia Spezzaferri
The marine environment in the Gulf of Gabes (southern Tunisia) is severely impacted by phosphate industries. Nowadays, three localities, Sfax, Skhira and Gabes produce phosphoric acid along the coasts of this Gulf and generate a large amount of phosphogypsum as a waste product. The Gabes phosphate industry is the major cause of pollution in the Gulf because most of the waste is directly discharged into the sea without preliminary treatment. This study investigates the marine environment in the proximity of the phosphate industries of Gabes and the coastal marine environment on the eastern coast of Djerba, without phosphate industry...
2018: PloS One
Min-Hye Jeong, Dohyun Kwak, Hyun-Soo Ra, A-Young Lee, Jong-Soo Lee
Few-layer black phosphorus has shown great potential for next-generation electronics with tunable band gap and high carrier mobility. For the electronic applications, the thickness modulation of a BP flake is an essential due to its thickness-dependent electronic properties. However, controlling the precise thickness of few-layer BP is a challenge for the high-performance device applications. In this study, we demonstrate that thermal treatment under ambient condition precisely controls the thickness of BP flake...
May 17, 2018: ACS Applied Materials & Interfaces
Sariga C Lal, Vidhya Lalan, Subodh Ganesanpotti
Ba2 Ln2/3 TeO6 (Ln = La, Pr, Nd, Sm, and Eu) double perovskites were synthesized via solid-state ceramic route. Preliminary X-ray diffraction studies indicated a pseudocubic structure with lattice parameters ranging from 8.55 to 8.44 Å for the substitution of rare earths from La to Eu. Raman spectra show the frequency dependence of various Raman bands with respect to rare-earth substitution and exhibit a significant shift in peaks to higher wavenumber region, which was observed only for symmetric stretching modes of LnO6 and TeO6 octahedra...
May 17, 2018: Inorganic Chemistry
Wenwei Chen, Yixi Zhuang, Le Wang, Ying Lv, Jianbin Liu, Tian-Liang Zhou, Rong-Jun Xie
Luminescent MOFs (typically dye-encapsulated MOFs) are considered as one kind of interesting down-conversion materials for white LEDs, but their quantum efficiency is not sufficiency and thus needs to be significantly enhanced for practical applications. In this study, we successfully synthesized a series of Rh@bio-MOF-1 (Rh = rhodamine) with an internal quantum efficiency as high as ~79% via a solvothermal reaction followed by cation exchanges. The high efficiency of the Rh@bio-MOF-1 composites was attributable to the high intrinsic luminescent efficiency of the selected Rh dyes, the confinement effect in the bio-MOF-1 host as well as the uniform particle morphology...
May 17, 2018: ACS Applied Materials & Interfaces
Teerapon Pirom, Amornchai Arponwichanop, Ura Pancharoen, Tetsu Yonezawa, Soorathep Kheawhom
Yttrium (Y) is an essential lanthanide rare earth element and can be effectively extracted and purified using a hollow fiber supported liquid membrane (HFSLM) system. However, the stability of HFSLM system is a significant challenge. Pseudoemulsion-hollow fiber strip dispersion (PEHFSD) system, providing excellent stability, is attracting research attention. In this work, the recovery of Y(III) by PEHFSD system using di(2-ethylhexyl)phosphoric acid (D2EHPA) as a carrier was investigated. The effects of several operating parameters, including the initial concentration of Y(III) in the feed phase, the flow rate of feed, the stirring speed and the volumetric ratio of feed to strip on Y(III) separation were studied...
May 16, 2018: Scientific Reports
Wei-Ren Liu
The luminescence properties of Eu2+-activated SrSi2N2O2 phosphor under VUV excitation have been firstly studied in this work. Normal pressure (1 atm) and high pressure (5 atm) synthesized- Sr0.96Si2N2O2:Eu+0.042+ powders were prepared by solid state reaction at temperature between 1400 °C and 1600 °C under 5% H2-95% N2 atmosphere and 5 atm N2 atmosphere, respectively. XRD patterns show that the purity and crystallinity of 1 atm-Sr0.96Si2N2O2:Eu+0.042+ is better than that of 5-atm Sr0.96Si2N2O2:Eu0.042+. Green emission broad band at 541 nm with Full Width at Half Maximum (FWHM) of 75 nm can be efficiently excited under 172 nm...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Wei-Ren Liu, Bingfu Lei
We synthesized a emission tunable Eu(II)-activated SrAl2Si2O8 phosphors Eu(II)-activated SrAl2Si2O8 phosphors. The emission color could be controlled from blue to greenish-blue emissions via changing Sr/Eu ratio. The SrAl2Si2O8 and EuAl2Si2O8 phases were found to form a complete solid solution with composition of (Sr1-xEux)Al2Si2O8 (0 ≤ x ≤ 1.0), as indicated by X-ray diffraction analysis. Our research results also reveal that the use of fluxing agents of H3BO3 or LiBO2 in the materials synthesis plays a crucial role in improving the photoluminescence (PL) properties of (Sr,Eu)Al2Si2O8 phosphor and the surface morphology...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Irish Valerie B Maggay, Wei-Ren Liu
Ba3Y(BO3)3:Eu3+, Bi3+ were successfully prepared via a solid-state reaction. The crystallinity, photoluminescence properties, energy transfer and thermal quenching properties were studied. Subjecting Ba3Y(BO3)3:Bi3+ samples to different excitation wavelengths (340-370 nm), obtained blue and green emission ascribed to Bi3+(II) and Bi3+(I) sites, respectively. The influence of these two sites were systematically investigated. Bi3+ efficiently transferred its absorbed energy to neighboring Eu3+ sites by enhancing its luminescence intensity...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Philipp Strobel, Christian Maak, Volker Weiler, Peter J Schmidt, Wolfgang Schnick
Highly efficient phosphor-converted light-emitting diodes (pc-LEDs) are popular in lighting and high-tech electronics applications. The main goals of present LED research are increasing light quality, preserving color point stability and reducing energy consumption. For those purposes excellent phosphors in all spectral regions are required. Here, we report on ultra-narrow band blue emitting oxoberyllates AELi2[Be4O6]:Eu2+ (AE = Sr,Ba) exhibiting a rigid covalent network isotypic to the nitridoalumosilicate BaLi2[(Al2Si2)N6]:Eu2+...
May 16, 2018: Angewandte Chemie
Long Gu, Huifang Shi, Mingxing Gu, Kun Ling, Huili Ma, Suzhi Cai, Lulu Song, Chaoqun Ma, Hai Li, Guichuan Xing, Xiaochun Hang, Jiewei Li, Yaru Gao, Wei Yao, Zhigang Shuai, Zhongfu An, Xiaogang Liu, Wei Huang
Smart materials with ultralong phosphorescence are rarely investigated and reported. Herein we report on a series of molecules with unique dynamic ultralong organic phosphorescence (UOP) features, enabled by manipulating intermolecular interactions through UV light irradiation. Our experimental data reveals that a prolonged irradiation of single-component organic phosphors of PCzT, BCzT, and FCzT under ambient conditions can activate UOP with emission lifetimes spanning from 1.8 to 1330 ms. These phosphors can also be deactivated back to their original states with short-lived phosphorescence after 3 h of UV irradiation at room temperature or through thermal treatment...
May 16, 2018: Angewandte Chemie
Young-Inn Kim, Seong-Jae Yun, Sung Kwon Kang
The title compound, C26 H20 N2 , was obtained during a search for new π-extended ligands with the potential to generate efficient phosphors with iridium(III) for organic light-emitting devices (OLEDs). The benzoquinoxaline ring system is almost planar (r.m.s. deviation = 0.076 Å). A pseudo-twofold rotation axis runs through the midpoints of the C2-C3 and C9-C10 bonds. The two phenyl rings are twisted relative to the benzoquinoxaline ring system, making dihedral angles of 53.91 (4) and 36.86 (6)°. In the crystal, C-H⋯π (arene) inter-actions link the mol-ecules, but no π-π inter-actions between aromatic rings are observed...
April 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Dandan Zhao, Yecan Pi, Qi Shao, Yonggang Feng, Ying Zhang, Xiaoqing Huang
The development of electrocatalysts with high activity and stability for oxygen evolution reaction (OER) is critically important, the one being regarded as the bottleneck process of overall water splitting. Herein, we fulfill significant OER improvement in both activity and stability by constructing a class of Ni(OH)2 -CeO2 supported on carbon paper (Ni x Ce y @CP) with an intimate hydroxide (Ni(OH)2 )-oxide (CeO2 ) interface. Such interface largely promotes the OER activity with a low overpotential of 220 mV at 10 mA cm-2 and a small Tafel slope of 81...
May 17, 2018: ACS Nano
Wentong Zhao, Xiaoqing Lu, Manickam Selvaraj, Wei Wei, Zhifeng Jiang, Nabi Ullah, Jie Liu, Jimin Xie
Low-cost electrocatalysts play an important role in the hydrogen evolution reaction (HER). Particularly, transition metal phosphides (TMPs) are widely applied in the development of HER electrocatalysts. To improve the poor electrochemical reaction kinetics of HER, we introduce a facile way to synthesize carbon core-shell materials containing cobalt phosphide nanoparticles embedded in different graphene aerogels (GAs) (CoP@C-NPs/GA-x (x = 5, 10 and 20)) using seaweed biomass as precursors. The synthesized CoP@C-NPs/GA-5 exhibits efficient catalytic activity with small overpotentials of 120 and 225 mV at current densities of 10 mA cm-2, along with the low Tafel slopes of 57 and 66 mV dec-1, for HER in acidic and alkaline electrolytes, respectively...
May 15, 2018: Nanoscale
Lauren O'Connell, Song Gao, Donald McCorquodale, Jay Fleisher, Jose V Lopez
Background: Similar to natural rivers, manmade inlets connect inland runoff to the ocean. Port Everglades Inlet (PEI) is a busy cargo and cruise ship port in South Florida, which can act as a source of pollution to surrounding beaches and offshore coral reefs. Understanding the composition and fluctuations of bacterioplankton communities ("microbiomes") in major port inlets is important due to potential impacts on surrounding environments. We hypothesize seasonal microbial fluctuations, which were profiled by high throughput 16S rRNA amplicon sequencing and analysis...
2018: PeerJ
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