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https://www.readbyqxmd.com/read/28098314/isoindoline-nitroxide-labeled-porphyrins-as-potential-fluorescence-suppressed-spin-probes
#1
F Liu, T J Zou, Z L Tan, S Chen, Z H Wu, G P Yan, Q Zhang, S C Liang, J Yang
A series of isoindoline nitroxide-labeled porphyrins were synthesized by the reaction of 5-phenyldipyrromethane and 5-(4'-carboethoxy-methyleneoxyphenyl)dipyrromethane with 5-formyl-1,1,3,3-tetramethylisoindolin-2-yloxyl (FTMIO) using the Lindsey method. The corresponding water-soluble spin-labeled porphyrins were also prepared. Subsequently, these compounds were characterized and their in vitro properties were evaluated. The electrochemical assay demonstrated that these isoindoline nitroxide-labeled porphyrins had similar electrochemical and redox properties to 5-carboxy-1,1,3,3-tetramethylisoindolin-2-yloxyl (CTMIO)...
January 18, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28081476/electron-spin-relaxation-of-a-boron-containing-heterocyclic-radical
#2
Sandra S Eaton, Kirby Huber, Hanan Elajaili, Joseph McPeak, Gareth R Eaton, Lauren E Longobardi, Douglas W Stephan
Preparation of the stable boron-containing heterocyclic phenanthrenedione radical, (C6F5)2B(O2C14H8), by frustrated Lewis pair chemistry has been reported recently. Electron paramagnetic resonance measurements of this radical were made at X-band in toluene:dichloromethane (9:1) from 10 to 293K, in toluene from 180 to 293K and at Q-band at 80K. In well-deoxygenated 0.1mM toluene solution at room temperature hyperfine splittings from (11)B, four pairs of (1)H, and 5 pairs of (19)F contribute to an EPR spectrum with many resolved lines...
December 30, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28080044/structural-dependence-of-the-ising-type-magnetic-anisotropy-and-of-the-relaxation-time-in-mononuclear-trigonal-bipyramidal-co-ii-single-molecule-magnets
#3
Feng Shao, Benjamin Cahier, Eric Rivière, Régis Guillot, Nathalie Guihéry, Victoria E Campbell, Talal Mallah
This paper describes the correlation between Ising-type magnetic anisotropy and structure in trigonal bipyramidal Co(II) complexes. Three sulfur-containing trigonal bipyramidal Co(II) complexes were synthesized and characterized. It was shown that we can engineer the magnitude of the Ising anisotropy using ligand field theory arguments in conjunction with structural parameters. To prepare this series of compounds, we used, on the one hand, a tetradentate ligand containing three sulfur atoms and one amine (NS3(tBu)) and on the other hand three different axial ligands, namely, Cl(-), Br(-), and NCS(-)...
January 12, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28078439/liquid-based-versus-conventional-cytology-of-oral-brush-biopsies-a-split-sample-pilot-study
#4
T W Remmerbach, N Pomjanski, U Bauer, H Neumann
OBJECTIVE: The aim of this prospective split sample study was to evaluate the applicability of liquid-based cytology (LBC) of oral brush biopsies for detection of oral cancer. METHODS: Two different preparation techniques were investigated: the conventional transfer procedure to glass slides and the LBC preparation method. The obtainments of epithelial cells were performed five times with a nylon brush and transferred onto five glass slides. Additionally, the brushes, which were normally discarded, were stored in a fixative solution...
January 11, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28067210/enhanced-electrochemical-performance-of-orientated-vo2-b-raft-like-nanobelt-arrays-through-direct-lithiation-for-lithium-ion-batteries
#5
Liang Liu, Qiang Liu, Wen Zhao, Guochun Li, Limei Wang, Weidong Shi, Long Chen
Lithiation modification of VO2(B) has been carried out by a facile hydrothermal process, and the compact and locally ordered VO2(B) raft-like nanobelt arrays have been prepared. The synthesis route provides a new approach to elaborate a VO2(B) nanostructure under a mild environment condition. It is found that the growth mechanism of VO2(B) raft-like nanobelt arrays is different from the traditional nucleation-growth process. A novel chemical lithiating-exfoliating-splitting model is proposed. Compared with the bulk counterpart, the lithiated VO2(B) raft-like nanobelt arrays as cathodes exhibit a higher discharge capacity and an enhanced high-rate performance owing to their increased structural anisotropy and decreased polarization...
January 9, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28065302/specific-membrane-dynamics-during-neural-stem-cell-division
#6
A Ettinger, Y Kosodo, W B Huttner
Neural stem and progenitor cells in the developing cerebral cortex, but also when grown in culture, display a range of distinct phenomena during cytokinesis. Cleavage furrow ingression in neural progenitor cells can bisect their basal processes and, later on, result in midbody formation at the apical surface. After abscission, these midbodies are released as membrane-bound particles into the extracellular space, in contrast to uptake and degradation of postabscission midbodies in other cell types. Whether these cellular dynamics are unique to neural stem cells, or more ubiquitously found, and what biological significance these processes have for cell differentiation or cell-cell communication, are open questions that require a combination of approaches...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28059196/synthesis-of-the-einstein-podolsky-rosen-entanglement-in-a-sequence-of-two-single-mode-squeezers
#7
Ilya A Fedorov, Alexander E Ulanov, Yury V Kurochkin, A I Lvovsky
We propose and implement a new scheme of generating the optical Einstein-Podolsky-Rosen entangled state. Parametric down-conversion in two nonlinear crystals, positioned back-to-back in the waist of a pump beam, produces single-mode squeezed vacuum states in orthogonal polarization modes; a subsequent beam splitting entangles them and generates the Einstein-Podolsky-Rosen state. The technique takes advantage of the strong nonlinearity associated with type-0 phase-matching configuration while, at the same time, eliminating the need for actively stabilizing the optical phase between the two single-mode squeezers...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28055031/a-customized-mobile-application-in-colonoscopy-preparation-a-randomized-controlled-trial
#8
Ala I Sharara, Jean M Chalhoub, Maya Beydoun, Rani H Shayto, Hamed Chehab, Ali H Harb, Fadi H Mourad, Fayez S Sarkis
OBJECTIVES: Adherence with diet and prescribed purgative is essential for proper cleansing with low-volume bowel preparations. The aim of this work was to assess the effect of a customized mobile application (App) on adherence and quality of bowel preparation. METHODS: One hundred and sixty (160) eligible patients scheduled for elective colonoscopy were randomly assigned to paper (control) or App-based instructions. The preparation consisted of low-fiber diet for 2 days, clear fluids for one day and split-dose sodium picosulfate/magnesium citrate (SPS)...
January 5, 2017: Clinical and Translational Gastroenterology
https://www.readbyqxmd.com/read/28054260/effect-of-er-yag-laser-on-dentin-demineralization-around-restorations
#9
Michelle Alexandra Chinelatti, Cristiane Tomaz Rocha, Vivian Colucci, Mônica Campos Serra, Antonio Luiz Rodrigues-Júnior, Silmara Aparecida Milori Corona
The aim of this study was to evaluate the effect of cavity preparation with Er:YAG laser on dentin adjacent to restorations submitted to cariogenic challenge in situ, by subsuperficial microhardness analysis. Bovine incisors were sectioned, flattened, and polished, resulting in 40 dentin slabs. The slabs were randomly assigned to four groups (n = 10), according to the cavity preparation method: I-high-speed handpiece (control); II-Er:YAG laser (160 mJ; 3 Hz); III-Er:YAG laser (260 mJ; 3 Hz); IV-Er:YAG laser (300 mJ; 3Hz)...
January 4, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28050615/pine-needle-derived-microporous-nitrogen-doped-carbon-frameworks-exhibit-high-performances-in-electrocatalytic-hydrogen-evolution-reaction-and-supercapacitors
#10
Guoyin Zhu, Lianbo Ma, Hongling Lv, Yi Hu, Tao Chen, Renpeng Chen, Jia Liang, Xiao Wang, Yanrong Wang, Changzeng Yan, Zuoxiu Tie, Zhong Jin, Jie Liu
The design of electrochemically active materials with appropriate structures and compositions is very important for applications in energy conversion and storage devices. Herein, we demonstrate an effective strategy to prepare microporous heteroatom-doped carbon frameworks derived from naturally-abundant pine needles. The preparation procedure is based on the carbonization of pine needles, followed by KOH activation at a temperature range of 700-1000 °C. The resultant nitrogen-doped carbon consists of abundant micropores and an ultrahigh specific surface area (up to 2433 m(2) g(-1)), leading to high performances in electrocatalytic hydrogen evolution reaction (HER) and supercapacitors...
January 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28026124/cobalt-nickel-layered-double-hydroxides-modified-on-tio2-nanotube-arrays-for-highly-efficient-and-stable-pec-water-splitting
#11
Weijian Chen, Taotao Wang, Jiawei Xue, Shikuo Li, Zidan Wang, Song Sun
TiO2 -based photoanodes have attracted extensive attention worldwide for photoelectrochemical (PEC) water splitting, but these materials still suffer from poor electron-hole separation and low photoconversion efficiency. Here, the high PEC water splitting activity and long-term stability against photocorrosion of well-aligned hierarchical TiO2 @CoNi-layered double hydroxides nanotube arrays (TiO2 @CoNi-LDHs NTAs) are reported. The typical TiO2 @CoNi-LDHs NTAs exhibits enhancing photocurrent density of 4.4 mA cm(-2) at a potential of 1...
December 27, 2016: Small
https://www.readbyqxmd.com/read/28009899/controllable-reduced-black-titania-with-enhanced-photoelectrochemical-water-splitting-performance
#12
Jijian Xu, Zhangliu Tian, Guoheng Yin, Tianquan Lin, Fuqiang Huang
Black titania prepared by metal-reduction methods is systematically studied and found the best controllable Mg-reduction method. Colored titania products from white, light blue, dark blue, to black were obtained with a crystalline/amorphous core-shell structure. The black titania shows a five times higher H2 production rate in photoelectrochemical (PEC) water splitting.
December 23, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28006713/influence-of-sodalite-zeolite-infiltration-on-the-coefficient-of-thermal-expansion-and-bond-strength-of-all-ceramic-dental-prostheses
#13
Ghassan Abdul-Hamid Naji, Ros Anita Omar, Rosiyah Yahya
In all-ceramic systems, a high incidence of veneer chip-off has been reported in clinical studies. Coefficient of thermal expansion (CTE) behaviour is one of the factors that may increase residual stress in the interface and influence the veneer/core bond strength. Therefore, this study aimed to evaluate the effect of sodalite zeolite-infiltration on the CTE behaviour and bond strength of different all-ceramic prostheses. The case-study groups were synthesized sodalite zeolite-infiltrated alumina (IA-SOD) and synthesized sodalite zeolite-infiltrated zirconia-toughened alumina (ZTA) (IZ-SOD), while the control groups were glass-infiltrated alumina (IA-glass) and glass-infiltrated ZTA (IZ-glass)...
December 15, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27996250/hybrids-of-cobalt-iron-phosphides-derived-from-bimetal-organic-frameworks-as-highly-efficient-electrocatalysts-for-oxygen-evolution-reaction
#14
Ting Zhang, Jing Du, Pinxian Xi, Cailing Xu
The electrochemical splitting of water, as an efficient and large-scale method to produce H2, is still hindered by the sluggish kinetics of the oxygen evolution reaction (OER) at the anode. Considering the synergetic effect of the different metal sites with coordination on the surface of electrocatalysts, the hybrids of Co/Fe phosphides (denoted as Co-Fe-P) is prepared by one-step phosphorization of CoFe metal-organic frameworks for the first time as highly efficient electrocatalysts for OER. Benefiting from the synergistic effect of Co and Fe, the high valence of Co ions induced by strongly electronegative P and N and the large electrochemical active surface area (ECSA) originated from exposed nanowires on the surface of Co/Fe phosphides, the resultant Co-Fe-P-1...
December 20, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27996237/targeted-synthesis-of-unique-nickel-sulfides-nis-nis2-micro-architectures-and-the-applications-for-the-enhanced-water-splitting-system
#15
Pan Luo, Huijuan Zhang, Li Liu, Yan Zhang, Ju Deng, Chaohe Xu, Ning Hu, Yu Wang
Water splitting is one of ideal technologies to meet the ever increasing demand of energy. Many materials have aroused great attention in this field. The family of nickel-based sulfide is one of examples that possess interesting property in water splitting fields. In this paper, a controllable and simple synthesized strategy of nickel sulfides was proposed. We firstly synthesized NiS2 hollow-microspheres via a hydrothermal process. After a precise heat control in specific atmosphere, porous NiS hollow-microspheres were prepared...
December 20, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27995797/a-facile-electrochemical-reduction-method-for-improving-photocatalytic-performance-of-%C3%AE-fe2o3-photoanode-for-solar-water-splitting
#16
Jue Wang, Joseph L Waters, Patrick Kung, Seongsin M Kim, John T Kelly, Louis E McNamara, Nathan I Hammer, Barry C Pemberton, Russell H Schmehl, Arunava Gupta, Shanlin Pan
Electrochemical reduction method is used for the first time to significantly improve the photo-electrochemical performance of α-Fe2O3 photoanode prepared on fluorine-doped tin oxide substrates by spin-coating aqueous solution of Fe(NO3)3 followed by thermal annealing in air. Photocurrent density of α-Fe2O3 thin film photoanode can be enhanced 25 times by partially reducing the oxide film to form more conductive Fe3O4 (magnetite). Fe3O4 helps facilitate efficient charge transport and collection from the top α-Fe2O3 layer upon light absorption and charge separation to yield enhanced photocurrent density...
January 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27991759/photoelectrochemical-properties-and-behavior-of-%C3%AE-snwo4-photoanodes-synthesized-by-hydrothermal-conversion-of-wo3-films
#17
Zhehao Zhu, Pranab Sarker, Chenqi Zhao, Lite Zhou, Ronald L Grimm, Muhammad N Huda, Pratap M Rao
Metal oxides with moderate band gaps are desired for efficient production of hydrogen from sunlight and water via photoelectrochemical (PEC) water splitting. Here, we report an α-SnWO4 photoanode synthesized by hydrothermal conversion of WO3 films that achieves photon to current conversion at wavelengths up to 700 nm (1.78 eV). This photoanode is promising for overall PEC water-splitting because the flat-band potential and voltage of photocurrent onset are more negative than the potential of hydrogen evolution...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27989115/bivo4-wo3-sno2-double-heterojunction-photoanode-with-enhanced-charge-separation-and-visible-transparency-for-bias-free-solar-water-splitting-with-a-perovskite-solar-cell
#18
Ji Hyun Baek, Byeong Jo Kim, Gill Sang Han, Sung Won Hwang, Dong Rip Kim, In Sun Cho, Hyun Suk Jung
Coupling dissimilar oxides in heterostructures allows the engineering of interfacial, optical, charge separation/transport and transfer properties of photoanodes for photoelectrochemical (PEC) water splitting. Here, we demonstrate a double-heterojunction concept based on a BiVO4/WO3/SnO2 triple-layer planar heterojunction (TPH) photoanode, which shows simultaneous improvements in the charge transport (∼93% at 1.23 V vs RHE) and transmittance at longer wavelengths (>500 nm). The TPH photoanode was prepared by a facile solution method: a porous SnO2 film was first deposited on a fluorine-doped tin oxide (FTO)/glass substrate followed by WO3 deposition, leading to the formation of a double layer of dense WO3 and a WO3/SnO2 mixture at the bottom...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27983780/zr-doped-mesoporous-ta3n5-microspheres-for-efficient-photocatalytic-water-oxidation
#19
Yawei Wang, Dazhang Zhu, Xiaoxiang Xu
Tantalum nitride (Ta3N5) has been considered as a promising candidate for photocatalytic water splitting because of its strong visible-light absorbance as far as 600 nm. However, its catalytic activity is often hampered by various intrinsic/extrinsic defects. Here, we prepared a series of Zr-doped mesoporous tantalum nitride (Ta3N5) via a template-free method and carried out a detailed investigation of the role of Zr doping upon the photocatalytic performance. Various physicochemical properties including crystal structure, optical absorption, and so on were systematically explored...
December 28, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27976888/magnetic-properties-of-a-dinuclear-nickel-ii-complex-with-2-6-bis-2-hydroxyethyl-methylaminomethyl-4-methylphenolate
#20
Hiroshi Sakiyama, Yukako Chiba, Katsuya Tone, Mikio Yamasaki, Masahiro Mikuriya, J Krzystek, Andrew Ozarowski
Magnetic properties of dinuclear nickel(II) complex [Ni2(sym-hmp)2](BPh4)2·3.5DMF·0.5(2-PrOH) (1), where (sym-hmp)(-) is 2,6-bis[(2-hydroxyethyl)methylaminomethyl]-4-methylphenolate anion and DMF indicates dimethylformamide, were investigated using high-frequency and -field electron paramagnetic resonance (HFEPR). To magnetically characterize the mononuclear nickel(II) species forming the dimer, its two dinuclear zinc(II) analogues, [Zn2(sym-hmp)2](BPh4)2·3.5DMF·0.5(2-PrOH) (2) and [Zn2(sym-hmp)2](BPh4)2·2acetone·2H2O (2'), were prepared...
January 3, 2017: Inorganic Chemistry
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