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。
A degradative acetolactate synthase (acetolactate pyruvate-lyase [carboxylating], EC 4.1.3.18) from Bacillus subtilis has been partially purified and characterized. The synthesis of the enzyme was induced by growth of cells in minimal medium plus isobutyrate or acetate. The enzyme was partially purified by ammonium su…
1. Electron microscopy, infra-red analysis and histochemical techniques have been used to determine the site of pigment deposition, the cellular localisation of pigment and the type of pigment precipitated in the egg shells of quail, White Leghorn, Brown Ranger and Black-Headed gull. 2. Transfer of pigment occurs via…
Not available
The rhombohedral perovskites are of interest in lattice dynamics (e.g. LaAlO3, PrAlO3) and for their ferroelectric properties (e.g. LiNbO3, PbZr/TiO3). In this paper, data scattered through the literature are correlated, with correction of some misleading mistakes of calculation. Geometrical descriptions are put in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally Induced Phase Separation Behavior of Compatible Polymer MixturesT. Nishi, T. T. Wang, and T. K. KweiCite this: Macromolecules 1975, 8, 2, 227–234Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March 1975https:…
We present extensive molecular-dynamics (MD) computations of the time-dependent correlation functions of the classical one-component plasma over a wide range of thermodynamic states characterized by the dimensionless parameter $\ensuremath{\Gamma}=\frac{{e}^{2}}{a{k}_{B}T}$, where $a$ is the ion-sphere radius. The com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Vibrations of Three Crystal Forms of Poly(vinylidene fluoride)Masamichi Kobayashi, Kohji Tashiro, and Hiroyuki TadokoroCite this: Macromolecules 1975, 8, 2, 158–171Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue…
SUMMARY Results are reported concerning the use of an energy dispersive X‐ray detector to carry out the analysis of thin foils in the electron microscope. The combination of a thin specimen and the extreme stability of the energy dispersive X‐ray detector enables the experimental determination of a calibration curve o…
The d1 layer metals TaS2, TaSe2, NbSe2, in all their various polytypic modifications, acquire, below some appropriate temperature, phase conditions that their electromagnetic properties have previously revealed as ‘anomalous’. Our present electron-microscope studies indicate that this anomalous behaviour usually inclu…
The products from nonflaming combustion of wood and a trimethylol-propane-based rigid-urethane foam that was not fire-retarded produced elevated carboxyhemoglobin levels but no abnormal neurological effects. However, when this type of foam contained a reactive phosphate fire retardant, the combustion products caused g…
This review is concerned with the structure, electrical, and optical properties of mixed-valence platinum complexes of the K2 Pt(CN)1, Br0.303H2O type and of TTF-TCNQ salts. Special attention is paid to the experimental results on the anisotropy of electron motion in these quasi-one-dimensional crystals. The theory of…
Abstract This work examines the effect that appreciable molecular extension has on the crystallization of long chain molecules. Elementary theoretical considerations presented indicate that to achieve high molecular extensions in solution a longitudinal velocity gradient of strain rate about 103s-1 is required. A meth…
Abstract The nature of slow crack and craze propagation in polymers and crack propagation in inorganic glass has been considered in terms of time dependent processes. By using a fracture mechanics analysis together with time dependent material parameters, equations have been derived to describe crack and craze propaga…
The Laplace–Young equation is solved for axisymmetric menisci, analytically in terms of elliptic integrals for all possible types of pendular rings and liquid bridges when the effect of gravity is negligible, numerically for selected other cases in order to assess gravity's effect. Meniscus shapes, mean curvatures, ar…
The semiconductor-metal transition in VO 2 has been investigated by means of XPS measurements. The band gap in the semiconducting region is found to be temperature-dependent with a room temperature value of E g =0.3 eV, in agreement with resistivity measurements. The core lines, which are asymmetric below T nu broaden…
We report partial densities of states of overlapping bandlike $p$ states and localized $d$ states in several insulating transition-metal oxides which have been determined from frequency-dependent photoemission spectra taken in the range 5-90 eV. We observe that $p$-band features become weak relative to $d$-state and s…
Some defects of the host lattice of crystals of the T3Al5O12 series (where T is Tb, Dy, Y, Ho, Er, Tu, Yb, Lu) doped with rare-earth ions (TR3+), are investigated by means of an analysis of the inhomogeneous splitting of the spectral lines of the TR3+ impurity ions. The connection of the concentration of some defect t…
A study of Ni3Mo by electron microscopy and electron diffraction reveals the presence of a new metastable intermediate phase during the early stages of ordering. This phase having the DO22 structure is only observed under well specified experimental conditions; it is generated immediately from the short range ordered…
Optical properties of single crystals of lead molybdate and lead tungstate (scheelite structure) have been investigated in order to identify the nature of the luminescent centres. Absorption, emission, and excitation spectra at different temperatures (1.5 to 300 K) and photoconductivity and quantum efficiency measurem…
Very low transmission loss fiber optical waveguides have been developed during the past two years which have pure fused silica cores surrounded by borosilicate glass claddings. A recent study of the binary borosilicate glass system revealed that the low refractive index values which can be achieved with this glass and…