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。
Thiolase (acetyl-coenzyme A [CoA] acetyltransferase, E.C. 2.3.1.19) from Clostridium acetobutylicum ATCC 824 has been purified 70-fold to homogeneity. Unlike the thiolase in Clostridium pasteurianum, this thiolase has high relative activity throughout the physiological range of internal pH of 5.5 to 7.0, indicating th…
We present a new scattering matrix formalism for the modeling of electromagnetic wave propagation in stratified media. It is computationally efficient and stable and is well suited to the layer geometry that is characteristic of stratified materials. It is applied successfully to the modeling of total attenuated refle…
Abstract A series of pure and mixed chromium standards has been analysed by x‐ray photoelectron spectroscopy in order to obtain a sufficiently homogeneous and self‐consistent set of spectral parameters to be used in the resolution of complex spectra. Additional information was obtained about the stability of the vario…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDihexadecyl phosphate, vesicle-stabilized and in situ generated mixed cadmium sulfide and zinc sulfide semiconductor particles: preparation and utilization for photosensitized charge separation and hydrogen generationHyeong Chan Youn, Subhash Baral, and Janos H. FendlerCite…
Abstract An aromatic, diether‐linked phthalonitrile resin, prepared from 4,4′‐bis(3,4‐dicyanophenoxy)biphenyl, exhibits excellent thermo‐oxidative properties. The resin is easily processed from the melt of the monomer in a controlled manner as a function of the amine curing agent and processing temperatures. Polymeriz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and decomposition kinetics of nitrous acid in aqueous solutionJong Yoon Park and Yin Nan LeeCite this: J. Phys. Chem. 1988, 92, 22, 6294–6302Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published inissue 1 November 1988htt…
A newly described plant-derived flavonoid, hypolaetin-8-glucoside, which has anti-inflammatory and gastroprotective actions in-vivo, and its corresponding aglycone, hypolaetin, have been compared with 14 other flavonoids for inhibition of eicosanoid generation via the 5-lipoxygenase and cyclo-oxygenase pathways in eli…
The internal bias field which is observed in many ferroelectric materials is explained semiquantita-tively. Dipolar defects in the ferroelectric cause div P # O at the defect sites. The electric fields diverging at these sites tend to orient the dipoles to energetically favourable orientations. The free energy is modi…
A three-body potential suitable for molecular dynamics (MD) simulations has been developed for vitreous silica by adding three-body interactions to the Born–Mayer–Huggins (BMH) pair potential. Previous MD simulations with the BMH potential have formed glassy SiO2 through the melt-quench method with some success. Thoug…
Abstract The ir spectra of lathyritic rat skin collagen and calf skin gelatin solutions at a variety of temperatures were obtained using Fourier transform ir spectroscopy and a 9‐reflection, 2‐pass ZnSe prism sample cell. The spectra were then deconvolved (based on Kauppinnen's method) and the behavior of the amide I…
The three-dimensional structure of the alpha 2 beta 2 complex of tryptophan synthase from Salmonella typhimurium has been determined by x-ray crystallography at 2.5 A resolution. The four polypeptide chains are arranged nearly linearly in an alpha beta beta alpha order forming a complex 150 A long. The overall polypep…
Abstract The population balance for batch aggregation of particulate suspensions is recast in a form that may be solved simply and accurately. The transformed equation is deduced with the introduction of only one additional parameter, which is found to be a constant for all cases. The transformed equation is tested by…
A drastic change is observed in the 1.5 μm Er-related photoluminescence spectra for GaAs:Er grown by metalorganic chemical vapor deposition, when the growth temperature and arsine partial pressure are reduced. An optically efficient Er-emitting center which shows a photoluminescence spectrum with narrow linewidth (les…
The relationship between the problem of the symmetry of a plane tiling and the properties of nonintegrable dynamic systems is reviewed. The formation of stochastic layers and a stochastic web in the motion of linear and nonlinear oscillators subjected to a perturbation is discussed in detail. Emphasis is placed on res…
PbTiO3 thin films have been grown successfully for the first time by using purely metalorganic precursors, namely, titanium isopropoxide and tetraethyllead. A scanning electron micrograph showed dense and noncolumnar growth with good surface morphology. Temperature-dependent x-ray diffraction studies provide evidences…
In order to understand some discrepancies in the recent Letter of Griniasty and Fishman, a study has been made of localization by a one-dimensional potential with slowly varying period. Away from the band center, localization is produced by local regions in which the Bragg condition allows backward scattering, and the…
Se presenta un estudio de la resistencia mecánica del yeso, basado en su refuerzo mediante la adición de polímeros sintéticos, en forma de fibras y dispersiones acuosas. Se pretende mejorar las características mecánicas del yeso, entre cuyas cualidades se pueden enumerar las siguientes: abundancia en España, bajo cost…
Electronic band structures of manganese compounds having cubic perovskite-type structure are calculated by a self-consistent augmented-plane-wave method. The energy dispersion, density of states and Fermi surface calculated for the nonmagnetic state of Mn 3 MC (M=Zn,Ga,In,Sn) are shown. The ferromagnetic band is also…
Introduction ‘Water is the most ubiquitous plasticizer in our world.’ It has become well established that plasticization by water affects the glass-to-rubber transition temperatures ( T g ) of many synthetic and natural amorphous polymers (particularly at low moisture contents), and that T g depression can be advantag…
We report on Raman scattering by longitudinal optical phonons in In1−y−zAlyGazAs (1−y−z=0.53) lattice matched to InP. The quaternary alloys were grown on (001) InP by molecular beam epitaxy. The phonon spectra exhibit three-mode behavior. The frequencies of AlAs- and GaAs-like modes vary linearly with the concentratio…