Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarboxylic carbonic anhydrides and related compoundsD. Stanley TarbellCite this: Acc. Chem. Res. 1969, 2, 10, 296–300Publication Date (Print):October 1, 1969Publication History Published online1 May 2002Published inissue 1 October 1969https://pubs.acs.org/doi/10.1021/ar50022…
Several peptides were isolated from the protein silk fibroin of Bombyx mori by means of ion-exchange chromatography of a chymotryptic digest. The sequences of three of the peptides, Gly-Ala-Gly-Tyr, Gly-Val-Gly-Tyr and Gly-Ala-Gly-Ala-Gly-Ala-Gly-Tyr, were known from previous chemical work, but the sequence of the fou…
Abstract The thermal degradation of polyphenylenes and poly(phenylene oxides) was studied under vacuum at temperatures between 350 and 620°C. The volatile and solid degradation products were analyzed by mass spectroscopy, infrared spectroscopy, and elemental analysis. Overall mechanisms for the thermal breakdown have…
Cobalt(II) complexes of the type [Co(terpy)X2] (I), [Co(terpy)2]X2,nH2O (II), and [Co(terpy)2]Y2,nH2O (III), where X = Cl-, Br-, I-, NCS-, and Y = ClO4-, [BPh4]-, have been prepared and characterized by magnetic, spectroscopic, and conductance measurements. The ?mono? complexes (I) are 5-coordinated and monomeric, non…
Abstract NaGaO 2 existiert in 2 Modifikationen. Die Tieftemperaturform [orthorhombischer β‐NaFeO 2 ‐Typ: a = 5,30 1 , b = 5,51 9 , c = 7,20 1 Å Z = 4] wurde an Einkristallen aufgeklärt: Raumgruppe C –P2 1 nb; alle Teilchen in 4(a), Parameter vgl. Tab. 1. KGaO 2 (Einkristalle) kristallisiert orthorhombisch [a = 5,51 5…
High-purity nickel bicrystals with controlled grain boundary misorientations have been grown from the melt using an electron beam floating-zone technique. These bicrystals have symmetrical tilt grain boundaries with 10° misorientation between {111} planes tilted about a 〈112〉 axis, and 10° twist about a {111} axis. Th…
The small-angle x-ray scattering (SAXS) pattern of polypropylene (PP) drawn at various temperatures (Td = 20°, 100°, and 135°C) was investigated in a range of very closely spaced draw ratio (λ) values through the neck region. In the zone before the neck starts (λ = 1.05–1.1) the uniform diffraction ring due to microsp…
Abstract Deferration by reduction of free Fe 2 O 3 with Na 2 S 2 O 4 in the presence of Na citrate and NaHCO 3 caused a change in valence state of 10 to 35 per cent of the total structural iron in micaceous vermiculites, soils, nontronite, and muscovite. An increase in Fe 2+ on deferration was accompanied by an equiva…
A rigorous electromagnetic theory of the diffraction of light by blazed lamellar gratings has been developed. It is applied to calculate the diffracted power distribution of four gratings (R1 − R4) whose grooves have the following depths and widths (b,l) in units of grating period a: (0.433, 0.750), (0.333, 0.667), (0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of secondary .alpha.-deuterium kinetic isotope effects to studies of enzyme catalysis. Glycoside hydrolysis by lysozyme and .beta.-glucosidaseF. W. Dahlquist, Tsafrira Rand-Meir, and Michael A. RafteryCite this: Biochemistry 1969, 8, 10, 4214–4221Publication Date…
Abstract Poly( p ‐phenylene sulfide), a poly(arylene sulfone), and a poly(arylene sulfonate) were subjected to thermal degradation in vacuo , at temperatures between 250 and 620°C. The volatile and solid degradation products were analyzed by mass spectroscopy, infrared spectroscopy, and elemental analysis. The major d…
Phase relationships in the system are first presented on P-T projections of three different composition joins. Crystalline phases encountered include albite, analcite, coesite, jadeite, nepheline, and quartz. Vapor-saturated melting curves proceed with negative dP/dT slopes to invariant points of pressures between 10…
Simultaneous hydrolytic decomposition of barium bis isopropoxide and titanium tetrakis tertiary amyloxide was used to produce stoichiometric BaTiO 3 . The particle size range was 50 to 150 Å. The purity was 99.98+%, the major contaminant being silicon from the glass apparatus. The homogeneity and stoichiometry of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatization of cross-linked polyacrylamide beads. Controlled introduction of functional groups for the preparation of special-purpose, biochemical adsorbentsJohn K. Inman and Howard M. DintzisCite this: Biochemistry 1969, 8, 10, 4074–4082Publication Date (Print):October 1…
The pyroelectric coefficient (at constant stress) of a 95 wt% BaTiO3, 5 wt% CaTiO3 ceramic composition (Clevite Ceramic B) was measured over the temperature range from 4.9° to 400°K. Extrema in the pyroelectric coefficient were observed at the rhombohedral-orthorhombic transition point (150°–170°K), the orthorhombic-t…
Increasing industrial uses of platinum and its associated metals – palladium, rhodium, ruthenium, iridium and osmium – have occasionally given rise to doubts as to the future availability of adequate supplies. This has sometimes discouraged research workers from considering the advantages of these metals in their sear…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic spectroscopic models related to coenzymes and base pairs. III. A 1,1'-trimethylene-linked thymine photodimer of cis-syn structureNelson J. Leonard, Krzysztof Golankiewicz, Robert S. McCredie, Suzanne M. Johnson, and Iain C. PaulCite this: J. Am. Chem. Soc. 1969, 91…
Diatoms are usually the major component of the algal flora in many streams, although green and blue-green algae may be present. These experiments were designed to determine if high temperature or a shift in the chemical composition of the water might bring about a dominance of blue-green algae and/or green algae rathe…
Absorption and fluorescence spectra of Co2+ in the tetrahedral (Td) site of ZnAl2O4 spinel (gahnite) at low temperatures have been observed and analyzed. The resulting energy-level diagram includes four quartet states and nine doublets, and has been interpreted first in terms of a weak field formalism without spin–orb…
Abstract The infrared absorption of poly(ethylene glycol) was measured in the molten state. Characteristic bands of the molten state were identified. Normal vibrations and frequency distributions were treated for various conformation models with CH 2 CH 2 O repeat units. The infrared absorption peaks of the molten sta…