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。
Abstract As part of a study to establish an effective use of underutilized resources, purple sea urchin test collagen was prepared by limited pepsin digestion and characterized. This collagen consisted of two α chains and has a chain composition of (α1)2α2 heterotrimer. The primary structure of the purple sea urchin c…
A synchrotron radiation X-ray powder diffractometer for samples of very small amount has been developed to collect high-quality diffraction patterns under extreme conditions, i.e. at low temperature and/or high pressure. A new cylindrical imaging plate (CIP) is used as a detector, in addition to a conventional flat-ty…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPorphodimethene−Porphyrin Interconversion: A Tetrapyrrolic Redox-Switchable MacrocycleMichael Harmjanz, Hubert S. Gill, and Michael J. ScottView Author Information Department of Chemistry, University of Florida Gainesville, Florida 32611-7200 Cite this: J. Am. Chem. So…
A new N- and S-containing heterocyclic compound, CAHMT, was synthesized and evaluated as a corrosion inhibitor for oil-well tubular steel (N-80) and mild steel (MS) at 105°C ± 2°C by the weight loss method. Potentiodynamic polarization measurements were carried out at room temperature for both steels in the presence o…
Using computer simulations we investigate the microscopic structure of the singular director field within a nematic droplet. As a theoretical model for nematic liquid crystals we take hard spherocylinders. To induce an overall topological charge, the particles are either confined to a two-dimensional circular cavity w…
A catecholate siderophore - anachelin - has been isolated from the cyanobacterium Anabaena cylindrica CCAP 1403/2A. The central part of the siderophore is a tripeptide consisting of L-Thr, D-Ser and L-Ser. Its C-terminus is linked amidically to a 1,1-dimethyl-3-amino-1,2,3,4-tetrahydro-7,8-dihydroxyquinolinium system…
Results of Differential Scanning Calorimetry (DSC) under non-isothermal conditions on Se100–xInx (x = 2, 4 and 10) glasses are reported and discussed. The glass transition region has been investigated in terms of activation energy and the dependence of glass transition temperature Tg on coordination number with varyin…
As a part of the study regarding an effective use of underutilized resources, type I collagen was prepared from several fish bones and partially characterized. The yield of collagen was fairfy high with values ranging from about 41 to 54% on the basis of lyophilized dry weight. The pattern of lysyl endopeptidase pepti…
We have performed physical and optical characterization of Si nanocrystals grown by ion implantation of Si+ ions at multiple energies with varying doses into thermally grown SiO2 films. The purpose of multiple implants was to achieve uniform composition of the added Si profile throughout the SiO2 film to produce Si pa…
The magnetism in three polycrystalline samples of the electron doped manganites ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Pr}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.025,$ 0.05, 0.1) was investigated by NMR on ${}^{55}\mathrm{Mn}$ and ${}^{141}\mathrm{Pr}$ nuclei, neutron diffraction, and magnetic measurements. In all systems t…
A complex perovskite-type single crystal Na1/2Bi1/2TiO3 (NBT) with a cubic-tetragonal-trigonal sequence of phase transition, ending in a ferroelectric state, has been studied by Raman scattering. In additional to a possible soft mode which softens far below the phase transition, a broad central component has been reve…
ABSTRACT: The yellowing rates of edible coatings were determined at 23, 40, and 55 °C at 75% relative humidity (RH). Whey protein isolate (WPI) coatings had lower yellowing rates than whey protein concentrate (WPC) and the same rates as shellac coatings. Hydroxypropyl methylcellulose (HPMC) coatings had the lowest yel…
We re-examine two important issues within the Peierls-Nabarro model, which are critical in obtaining accurate values for the Peierls stress. The first is related to the sampling scheme (double versus single counting) of the misfit energy across the glide plane and the second is the effect of atomic relaxation on the P…
An analytical set of field-induced coordinates (FICs) is defined. It is shown that, instead of 3N−6 normal coordinates, a relatively small number of FICs is sufficient to describe the vibrational polarizability and hyperpolarizabilities due to nuclear relaxation. The fact that the number of FICs does not depend upon t…
Employing synchrotron radiation in backscattering geometry we studied the 105 K cubic to tetragonal (CT) phase transition of SrTiO3 by X-ray diffraction using the (006) reflection of three (001) oriented samples. Two of the crystals were covered with ultra-thin films of YBa2Cu3O7–δ (14 nm) and GdBa2Cu3O7–δ (28 nm), re…
We examined the solid-state structures of two cylinder-forming semicrystalline diblock copolymers, where polyethylene forms the continuous matrix in both, using simultaneous small- and wide-angle X-ray scattering combined with transmission electron microscopy. The mesophase structure formed in the melt is largely reta…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of New Water-Soluble Self-Doped PolyanilineHsien-Kuang Lin and Show-An ChenView Author Information Department of Chemical Engineering, National Tsing-Hua University, Hsinchu, Taiwan 30043, ROC Cite this: Macromolecules 200…
The effects of the oxide additives MnO 2 , Co 3 O 4 , and Sb 2 O 3 , commonly incorporated in commercial Bi 2 O 3 ‐doped ZnO varistors, on the current–voltage characteristics and microstructure of 0.25 mol% V 2 O 5 ‐doped ZnO varistors have been studied. MnO 2 is the most significant additive in terms of its effects o…
The synthesis of intramolecularly hydrogen-bonded dendrons with stereogenic terminal groups derived from (1 S, 2 S )-(+)-thiomicamine up to the third generation is described. Circular dichroism (CD) studies reveal that the equilibria interconverting two diastereomeric helical conformations (M and P helices) relating a…
The diatom Achnanthes brevipes C.A. Ag. was cultured in the presence of limiting concentrations of nitrogen (N) or inorganic phosphate (P i ). Growth, in terms of final yield, was more affected by N limitation than P i limitation; N limitation had a greater effect also on protein and chlorophyll content. Carbohydrate…