Materials Literature
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Abstract An orthochlorite (sheridanite) was heated to 610°C to dehydroxylate the hydroxide sheet and to oxidize ferrous iron. The heated sample was shaken for 20 min in a mixed solution of 0·2 N HCl and 0·2 N NaCl to dissolve the dehydroxylated hydroxide sheet. X-ray diffraction, thermal, infrared absorption and chemi…
On the foundations established by previous experimental and theoretical investigations a basic model is constructed for the protonic order-disorder transition in Sn${\mathrm{Cl}}_{2}$ \ifmmode\cdot\else\textperiodcentered\fi{} 2${\mathrm{H}}_{2}$O. This model is comparable to the Slater model of K${\mathrm{H}}_{2}$P${…
New analysis is presented using a unipolar ion-mobility conduction model in planar geometry which solves for the transient behavior of the bulk electric field and space-charge distributions as a function of time and space, as well as the resulting time dependence of the terminal quantities of voltage and current. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and bonding of two cubane-like iron-nitrosyl complexes, Fe4(NO)4(.mu.3-S)4 and Fe4(NO)4(.mu.3-S2)(.mu.3-NC(CH3)3)2. Stereochemical consequences of bridging ligand substitution on a completely bonding tetrametal cluster unit and of different terminal l…
Three genes, thrA, thrB, and thrC, were previously defined and localized in the threonine locus of Escherichia coli K-12. thrA, thrB, and thrC specify the enzymes aspartokinase I-homoserine dehydrogenase I, homoserine kinase, and threonine synthetase, respectively. A complementation analysis of the threonine cluster u…
Abstract Crystallization kinetics for 12 polymers including polyolefins, polyesters, polyurethanes, polysiloxanes was measured by the evolution of heat in a modified Calvet‐type calorimeter over wide temperature ranges. The results are analyzed in terms of the Avrami equation and a comparison between calorimetric and…
H Herman (ed) New York: Academic Press 1973 pp xi + 398 price $28 This volume contains four contributions: ‘Epitaxial interfaces’ by J H van der Merwe surveys at length lattice mismatch and dislocation formation, but with hardly any mention of real dimensions in real systems. It is therefore not too helpful for the cr…
The complement-derived chemotactics factors, C3a, C5a, and C567, as well as the chemotactic factor obtained from culture filtrates of Escherichia coli, induce release of the lysosomal enzymes, β-glucuronidase and lysozyme, from rabbit peritoneal neutrophils. Under the same circumstances, there is little or no release…
Many of the significant reactions of unsaturated hydrocarbons (hydrogenation, isomerization, carbonylation, oxidation, polymerization) are catalyzed heterogeneously by metals in or near Group VIII or homogeneously by salts and complexes of these elements. Those reactions effected in both systems are discussed in terms…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclotetramerization of 2-dimethylamino-4-tert-butylpyrrole. Tetra-tert-butylporphyrinsB. J. Whitlock, H. W. Whitlock, and H. AllesCite this: J. Am. Chem. Soc. 1974, 96, 12, 3959–3965Publication Date (Print):June 1, 1974Publication History Published online1 May 2002Published…
Secondary recrystallization was observed in 0.25mm thick dysprosium sheet having final cold reductions in the range of 40-60% prior to annealing at 1150°C in a dry helium atmosphere. X-ray and etch-pit studies revealed a predominant (0001)[10\bar{1}0] secondary recrystallized texture. Magnetization curves at 4.2 K and…
Single crystals of Ca2BO3Cl grown from CaCl2 flux near 800 °C have space group P21/c and unit-cell constants a = 3.9484 (4), b = 8.692 (2), c = 12.402 (2) A, β = 100.27 (1)°.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structure, and magnetism of a tetranuclear basic quinoline adduct of copper(II) trifluoroacetateR. G. Little, James A. Moreland, D. B. W. Yawney, and Robert J. DoedensCite this: J. Am. Chem. Soc. 1974, 96, 12, 3834–3842Publication Date (Print):June 1, 1974Public…
Debye rings of several samples of HgS were taken at various temperatures between 20° and 370°C. Impure samples transformed from α-HgS (trigonal) to β-HgS (cubic) at about 300°C in heating and from β to α at about 200°C in cooling. The transformation temperature in heating or cooling shifts upwards for samples of highe…
Taking polycrystalline cadmium as an example and by utilizing the predicted temperature or strain rate-dependence of the (Hall-Petch) stress-grain size parameters, a reasonably quantitative explanation is given for the grain size dependence of apparent activation volume measurements. The explanation involves the theor…
Mutants deficient in both glucose-6-phosphate dehydrogenase and phosphoglucose isomerase lysed 4 to 5 h after growth in nutrient medium containing glucose, or after prolonged incubation if the medium contained galactose. The lysis could be prevented by the addition of any other rapidly metabolizable carbon source such…
A bstract Assessment of the insulation (clo) value and evaporative impedance ( i m /clo) value of a clothing system can provide an accurate estimate of the relative advantages of one garment or fabric over another with respect to the thermal protection and/or strain associated with wearing the clothing. There are effe…
Optical-absorption spectra are presented from 3.8 to 7.4 eV of the coloration produced in crystalline MgO by bombardment with 3-MeV ${\mathrm{Ne}}^{+}$ convering a fluence range from ${10}^{14}$ to ${10}^{17}$ ions ${\mathrm{cm}}^{\ensuremath{-}2}$. Dose dependence of absorption at 5.0, 5.8, and 7.0 eV and of the inte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized crystal absorption spectra and crystal structure for potassium tetrabromoplatinate(II)Roy F. Kroening, Rhonda M. Rush, Don S. Martin, and Jon C. ClardyCite this: Inorg. Chem. 1974, 13, 6, 1366–1373Publication Date (Print):June 1, 1974Publication History Published o…
The synthesis of polyphenylquinoxalines (PPQ) is discussed in detail. Solutions of PPQ at 20% solids content from stoichiometric quantities of pure reactants are generally metastable, increasing in viscosity and, in some cases, gelling. This can be alleviated without any appreciable detrimental effect upon the polymer…