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 tapeta lucida and the organization of the visual cells of the walleye and the sauger are studied. The reflecting material of the tapeta is demonstrated to be a reduced pteridine, 7, 8-dihydroxanthopterin, which occurs in the epithelial processes as densely packed anisometric granules about 0.5 μm long.The organiza…
Abstract Fabric refers to the spacial arrangement of clay particles in a sample relative to a reference plane. X-ray diffraction data yield an ‘amount of orientation’ ( AO ) that varies from zero for ideal random to 100 for ideally oriented fabric. The AO has been related to the average angle of inclination of clay pa…
Abstract not Available.
Two aromatic polysulfones, poly(oxy-1,4-phenylenesulfonyl-1,4-phenyleneoxy-1,4-phenyleneisopropylidene-1,4-phenylene) (I) and poly (oxy-1,4-phenylenesulfonyl-1,4-phenylene) (II), undergo crosslinking and chain scission at 30°C during γ-irradiation, the former being predominant in vacuum and the latter in air. Both pro…
Cathodic electrolysis of 2H⋅⋅⋅TaS2 in a dilute sulfuric acid electrolyte results in intercalation of hydrogen and water. The water content increases as the ionic strength of the electrolyte is decreased. Addition of neutral surfactants (1%−10% Triton X−705 or glycerol) followed by high−speed stirring gave TaS2 layers…
The reactivity and the mode of activation of the essential--SH group (Cys-149) of D-glyceraldehyde-3-phosphate dehydrogenase have been studied by means of a spectrophotometric method [Polgár, L., FEBS Lett. 38, 187-190 (1974)], capable of detecting the dissociated form of the thiol group in proteins. Alkylations of Cy…
Cell extracts of Brucella abortus (British 19) catabolized erythritol through a series of phosphorylated intermediates to dihydroxyacetonephosphate and CO-2. Cell extracts required adenosine 5'-triphosphate (ATP), nicotinamide adenine dinucleotide (NAD), Mg2+, inorganic orthophosphate, and reduced glutathione for acti…
The conduction mechanisms of ultrathin (10−100 Å) metal films are investigated. The electrical conductivity and activation energy of discontinuous Au films grown in UHV are correlated with island size and separation and average film thickness. The relationship between film conductivity and deposition rate and substrat…
To investigate the mechanism of the killer effect of iron group ions (M 2+ ) on the green luminescence in ZnS:Cu, Al phosphors, the dependences of the intensity and decay rate of the green luminescence on the M 2+ concentrations, the relation of the green luminescence intensity vs. excitation intensity, and some other…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of tetramethylammonium tetrachloroferrate(II). Comparison of iron(II) and iron(III) bond lengths in high-spin tetrahedral environmentsJoseph W. Lauher and James A. IbersCite this: Inorg. Chem. 1975, 14, 2, 348–352Publication Date (Print):February 1, 1975Publication…
We show that for certain liquid crystals, characterized by very small nematic/smectic−A latent heats, the transition from a nematic phase, held firmly in a bent state, to a smectic−A phase takes place via an intermediate state which is stable in a given temperature range and which we have called ’’striped texture’’. T…
The poling of certain compositions of PLZT ceramic is shown to cause a phase transition (α→β). The polar β phase can be rhombohedral, tetragonal, or orthorhombic depending upon composition, while phase α is always cubic. Characteristic subgrain domain structure is observed in the β phase for orthorhombic and rhombohed…
Measurements of the electron diffusion coefficient in amorphous films of tungsten oxide give a value of D=0.0025±0.0006 cm2 sec−1. D decreases by less than a factor of 2 between +40 and −20 °C.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 79. Novel [.sigma. + .pi.]reactions of hexaorganodisilanes with acetylenes catalyzed by palladium complexesHideki Sakurai, Yoshiyasu Kamiyama, and Yasuhiro NakadairaCite this: J. Am. Chem. Soc. 1975, 97, 4, 931–932Publication Date (Print…
Sodium phosphotungstate glasses of various ratios of were doped by 1.0 weight per cent Eu 3+ . Fluorescence spectra were measured on excitation to 394 and 464 nm. On excitation to 394 nm the ratio of emissions and the amount of splitting of the transition are dependent on composition of the glass and conditions of gla…
Calculation of the current-potential relations for corroding electrodes as a function of the cathodic and anodic transfer coefficients and as a function of the difference between the corrosion and reversible potentials demonstrates the deficiencies of the Stern-Geary equation for determining corrosion rates. The calcu…
A method for studying the dynamics of liquid drops by numerical integration of the Navier-Stokes equations is used to examine the motion of colliding drops, with application to the raindrop problem. Consideration is limited to drops of nearly equal size impacting along their line of centers. The numerical solutions ar…
The compounds , which show high electrical conductivity, are electrochemically reduced in an aqueous alkaline solution to give rise to the oxygen deficient state . The electrochemical redox reactions are reversible in the range . The electrode potentials of in a solution have been measured as a function of δ. From the…
A statistical thermodynamic description of the two-dimensional system composed of non-spherical particles with the pair potential of the Kihara-core type is proposed; thermodynamic functions of fluids are expressed in terms of the integrals over two angles and the shortest distance between envelopes of the respective…
The crystallographic transitions of the pseudo-orthorhombic monoclinic I rare-earth pentaphosphates are examined. The atom positions allow a smooth transition into strict orthorhombic symmetry and a second-order monoclinic-to-orthorhombic phase charge is observed for La${\mathrm{P}}_{5}$${\mathrm{O}}_{14}$, Pr${\mathr…