Materials Literature
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The crystallographic structure of 3Al2O3-2SiO2 mullite has been studied by means of high-resolution electron microscopy. The best conditions for atomic imaging of this compound are discussed relative to the atomic resolution microscope at Berkeley. [001] multibeam images have been produced at a resolution better than…
The geometric isotope effect can be seen in many types of hydrogen-bonded crystals such as tetragonal ${\mathrm{KH}}_{2}$${\mathrm{PO}}_{4}$-type crystals in which the hydrogen-bond lengths expand as deuterium atoms are substituted for the hydrogen atoms. This paper explains the mechanism behind the geometric isotope…
We developed a new magnetic material R3T system, where R is a rare earth metal and T a transition metal, used as a regenerator matrix in a conventional two-stage Gifford-McMahon (GM) type cryocooler. These compounds, especially Er3Ni (Erbium 3 Nickel), possess extremely large heat capacities between 4 K and room tempe…
Abstract The crystal structure of the new mineral kamchatkite, a = 9.741(5), b = 12.858(6), c =7.001(3)Å, space group Pna 2 1 , Z = 4, has been determined through direct methods using 1430 intensities and refined to a final discrepancy index R = 0.055. It contains (SO 4 ) tetrahedra and Cu octahedra interconnected by…
Abstract The level of adsorption of enantiomeric tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy) 3 2+ ) by seven different smectite samples was found to be controlled by the total surface area of the clay. The level corresponded to one monolayer. The adsorption of the racemic mixture was lower for all samples, being limite…
The diamond film polishing apparatus with hot metals has been presented . Diamond films deposited by both microwave plasma CVD and arc discharge plasma jet CVD are used as workpieces . As a diamond film sways on a polishing plate made of an iron or a nickel heated to 75O''95O C it is finished to flat and glass-like su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray crystal structure determination of a novel chiral heteropolyanion: the "3:1" octadecatungstohexaphosphateRafael Acerete, Juan Server-Carrio, Angel Vegas, and Martin Martinez-RipollCite this: J. Am. Chem. Soc. 1990, 112, 25, 9386–9387Publication Date (Prin…
The feasibility of photoelectron Auger electron coincidence spectroscopy from solid surfaces has been demonstrated by Haak et al. [Ph. D. thesis, University of Groningen, The Netherlands, 1983; Phys. Rev. Lett. 41, 1825 (1978); Rev. Sci. Instrum. 55, 696 (1984)]. They were able to show the considerable power of the te…
A simple theory of potential and current distributions developed elsewhere, based on the parallel‐plate electrochemical cell under linear kinetics, is applied to electrochromic windows. In our case, only the working electrode has appreciable resistance. The model permits a predictive analysis of the effects of operati…
Etude de la coordination autour du cation Ca pour 254 composes mineraux, contenant au total 368 polyedres, en effectuant une selection sur la base de la precision des donnees structurales. Analyse statistique en fonction des variables liees aux distances Co-O et en fonction du volume du polyedre concerne. Proposition…
The substrate binding sites of adenylate kinase (AK) proposed by X-ray crystallographic studies [Pai, E. F., Sachsenheimer, W., Schirmer, R. H., & Schulz, G. E. (1977) J. Mol. Biol. 114, 37-45, and subsequent revisions] were evaluated by site-specific mutagenesis in conjunction with structural analysis by NMR. The res…
The activities of prolyl 4-hydroxylase (PH) and galactosylhydroxylysyl glucosyltransferase (GGT), both enzymes of collagen biosynthesis, and the concentration of hydroxyproline (Hyp) were measured in soleus and tibialis anterior muscle after periods of 0, 7 and 21 days of immobilization following a swimming training f…
Abstract Novel linear and three‐arm star radial thermoplastic elastomers (TPE) comprising rubbery polyisobutylene (PIB) center blocks connected to glassy poly( p ‐chlorostyrene) (PpClSt) outer blocks have been synthesized by sequential monomer addition. For triblock polymer synthesis isobutylene (IB) was added continu…
Granular material perceived as a collection of particles is modeled as a macrocontinuum. The model takes into account the effects of microdiscreteness and the interparticle contact properties in the system. With consideration of particle rotation, the continuum model for granular solid is found to be of micropolar typ…
A small fraction of relatively insoluble gas effectively inhibits rapid coarsening of a liquid/gas foam. This effect, which is of particular practical importance in the brewing industry, is explained and simulated. Below a certain critical concentration of the insoluble gas, an inhomogeneous structure is formed. The c…
High-voltage Schottky diodes have been fabricated on diamond epitaxial films with the structure: metal/undoped diamond/p + -type diamond. The films were epitaxially grown on synthesized single-crystal diamonds (100) by microwave plasma-assisted chemical vapor deposition (CVD) using H 2 and CH 4 . B 2 H 6 was used at B…
The phosphorylation and activation of tyrosine hydroxylase was examined in PC12 cells following depolarization with KCl or treatment with nerve growth factor. Both treatments activate tyrosine hydroxylase (TH) and increase enzyme phosphorylation. Site-specific analysis of the tryptic phosphopeptides of TH isolated fro…
Abstract A series of polyamide‐azomethine‐ethers was prepared by condensation of 4,4′‐diaminoanilide with 4,4′‐diformyl‐α,ω‐diphenoxyalkane, 4,4′‐diformyl‐3,3′‐methoxy‐α,ω‐diphenoxyalkane, and 4,4′‐diformyl‐3,3′‐ethoxy‐α,ω‐diphenoxyalkane, respectively. The inherent viscosities of polymers were obviously increased whe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVersatile methods for the synthesis of differentially functionalized pentaerythritol amine derivativesT. Jeffrey Dunn, William L. Neumann, Milorad M. Rogic, and Steven R. WoulfeCite this: J. Org. Chem. 1990, 55, 26, 6368–6373Publication Date (Print):December 1, 1990Publicati…
The evaporative decomposition of solutions method was used to form V 2 O 5 . Spraying above the congruent melting temperature of V 2 O 5 (690°C) resulted in dense spherical particles with a smooth surface. Spraying below the V 2 O 5 melting temperature yielded porous V 2 O 5 powder with a rough surface. Reduction of t…