Materials Literature
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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…
KLL, and KLM Auger and X-ray photoelectron spectra for pure magnesium, for Mg 2 Cu, Mg 3 Au and Mg 3 Bi 2 , and for MgO are reported. Assignments are made for almost all of the observed features in the Auger spectra. For the pure metal, internal photoemission peaks and a plasmon gain peak are shown to be present in th…
Conductive particulate inclusions in a continuous insulating matrix typically impart a precipitous drop in electric resistivity commencing at a threshold volume fraction φcrit which depends on filler particle form and spatial distribution. An illuminating formulation relating threshold composition to the morphology of…
Radiation damage in metals at elevated temperatures produces small dislocation loops and voids. The growth of these sinks is determined by the steady−state diffusion of point defects migrating in the stress field of these sinks. To obtain the steady−state current of point defects to these spherical sinks a perturbatio…
The phase transition in SnTe was investigated on a single crystal with low carrier concentration (0.88×10 20 cm -3 ) by the neutron diffraction method. A second-order phase transition takes place at 98 K. Comparison of this considerably high transition temperature with previous data has revealed that the phase transit…
A normal coordinate analysis of cellulose I has been performed for an isolated chain using a valence force field and atomic coordinates from an x−ray refinement analysis. The calculated frequencies show good agreement with the observed infrared and Raman data, while the computed potential energy distribution is compat…