Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The preparation of methyl viologen−smectite (synthetic saponite, Sumecton SA; synthetic hectorite, Laponite XLG; and natural montmorillonite, Kunipia F) intercalation compounds and the photoinduced electron transfer from smectite to methyl viologen were investigated. UV−vis and electron spin resonance spectra revealed…
The crystal structure of the phosphorylating glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from Bacillus stearothermophilus was solved in complex with its cofactor, NAD, and its physiological substrate, D-glyceraldehyde 3-phosphate (D-G3P). To isolate a stable ternary complex, the nucleophilic residue of the active…
Abstract The deformation and breakup of a single polycarbonate (PC) drop in a polyethylene (PE) matrix were studied at high temperatures under simple shear flow using a specially designed transparent Couette device. Two main breakup modes were observed: (a) erosion from the surface of the drop in the form of thin ribb…
A new oxoborate β -CaB 4 O 7 has been synthesized under high-pressure/high-temperature conditions from calcium oxide and boron oxide with a Walker-type multianvil apparatus at 7.7 GPa and 1100 °C. Single crystal X-ray structure determination of β -CaB 4 O 7 revealed: Pmn2 1 , a = 1058.4(1), b = 436.9(1), c = 419.4(1)…
The first step of proline biosynthesis is catalyzed by gamma-glutamyl kinase (GK). To better understand the feedback inhibition properties of GK, we randomly mutagenized a plasmid carrying tomato tomPRO1 cDNA, which encodes proline-sensitive GK. A pool of mutagenized plasmids was transformed into an Escherichia coli G…
We have investigated the undesired reduction of spin polarization in La 1- x Sr x MnO 3 (LSMO)/SrTiO 3 (STO)/LSMO spin tunnel junctions by employing superlattices of LSMO/STO with various x of 0.2, 0.3, and 0.4. The systematic data revealed that the instability towards the A-type (layered) antiferromagnetic phase domi…
Acyl-CoA dehydrogenase gene (yafH) of Escherichia coli was expressed together with polyhydroxyalkanoate synthase gene (phaC(Ac)) and (R)-enoyl-CoA hydratase gene (phaJ(Ac)) from Aeromonas caviae. The expression plasmids were introduced into E. coli JM109, DH5 alpha and XL1-blue, respectively. Compared with the strains…
This paper describes the hydrophobic transfer of unfilled room temperature vulcanized silicone rubber (RTV) resulting from UV radiation, corona discharges, high temperature, and a deposition of hydrophilic layer. The chemical and morphological structure at the surface layer and the migrating behavior of low molecular…
The substance MHPOBC is the oldest and still most important reference antiferroelectric liquid crystal (AFLC). There is still considerable controversy concerning the correct phase designations for this material and, in particular, about the presence or absence of SmC* in its phase sequence. By means of dielectric spec…
The breakup of dislocation dipoles in plastically deformed samples of undoped and 30‐ppm‐MgO‐doped sapphire (α‐Al 2 O 3 ) was monitored using conventional TEM techniques. Dislocation dipoles break up into prismatic dislocation loops in a sequential process during annealing; i.e., dislocation loops are pinched off at t…
The effects of oil palm wood flour and vulcanization system on curing characteristics and mechanical properties of oil palm wood flour (OPWF)-natural rubber composites were studied. OPWF loading in the range of 0-50 phr and two vulcanisation systems, conventional vulcanisation (CV) and semi-efficient vulcanisation (se…
The rate of thiol-disulfide exchange of dansyl groups mediated by dithiothreitol depends on the structure of the dendrimer. In general, the rate of exchange decreases as the size of the dendrimer increases. Dendrimers with disulfides attached near the core undergo exchange more slowly than dendrimers with disulfides n…
Abstract Non-ionic surfactants Brij 56 and Igepal CO 720, containing hydrophilic poly(ethylene oxide) (PEO) segments, expanded smectite from 1.5 nm to 1.7 nm at room temperature. The surfactant-smectite composites had larger layer spacings than Ca-smectite after heat treatment. The surfactant-smectite composites were…
Carbon-hydrogen bond cleavage reactions of CH3OH and CH4 by a dirhodium(II) diporphyrin complex with a m-xylyl tether (.Rh(m-xylyl)Rh.(1)) are reported. Kinetic-mechanistic studies show that the substrate reactions are bimolecular and occur through the use of two Rh(II) centers in the molecular unit of 1. Second-order…
In order to detect and locate partial discharge (PD) activity within HV cables and in particular cable joints, the feasibility of using a very high frequency WHO capacitive coupler technique has been investigated. In addition, an alternative PD offline test method for cable joints or cable sections within long cable s…
Alumina bicrystals with low‐angle and near‐Σ3 <0001> tilt grain boundaries were fabricated using diffusion bonding to study the dislocation structures in alumina grain boundaries. The resulting grain‐boundary structures were investigated using high‐resolution transmission electron microscopy, and the grain‐bound…
We present a novel method for forming linearly polarized axially symmetric beams with various polarization orders that is based on computer-generated space-variant subwavelength gratings. We introduce and experimentally demonstrate that our space-variant polarization state manipulations are accompanied by a phase modi…
Abstract Silica‐based hybrid organic‐inorganic materials prepared by sol‐gel chemistry exhibit chemical and physical properties revealing their anisotropic organization. Besides the opportunities that these phenomena open for the preparation of new materials, they also provide arguments for the chemist looking for bet…
PURPOSE: To compare the diagnostic accuracy of gadobenate dimeglumine (Gd-BOPTA)-enhanced versus gadoterate meglumine (Gd-DOTA)-enhanced magnetic resonance (MR) angiography in patients with peripheral arterial occlusive disease (PAOD). MATERIALS AND METHODS: Fifty-six patients underwent MR angiography enhanced with ei…
Symmetrical Σ7 tilt grain boundaries of alumina (Al 2 O 3 ) were studied using bicrystals. Three types of Σ7 boundaries were successfully fabricated, that is, rhombohedral twin (Σ7{1[Onemacr]02}) and two types of [0001] symmetrical tilt grain boundaries with grain‐boundary planes {4[Fivemacr]10} and {2[Threemacr]10} (…