Materials Literature
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The distribution of the values of the dihedral angles (χj) in the side group conformations of various amino acid residues in the three proteins myoglobin, lysozyme and tosyl‐α.‐chomotrypsin has been analysed. The observations in these protein structures are found to agree well with the theoretical distribution worked…
The ferroelectric transition in K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$ has been investigated both experimentally and theoretically. Coherent neutron scattering by fluctuations associated with the transition was studied both above and below the transition temperature. None of the optic-phonon modes was found to change…
This paper is a review of existing knowledge on cavitation nuclei. The lack of significant tensions in ordinary liquids is due to so-called weak spots or cavitation nuclei. The various forms which have been proposed for nuclei are gas bubbles, gas in a crevice, gas bubble with organic skin, and a hydrophobic solid. Th…
The wetting of AlN and TiC by liquid Ag and liquid Cu was investigated by the sessile drop technique at 10 −6 torr or less. An empirical relation was established between the cosine of the contact angle and the temperature or surface tension of the liquid drop. The critical surface tension for spreading and its physica…
Abstract The breakdown mechanism of an aromatic polyamide and four polyimides has been studied under vacuum in the temperature range of 375–620°C, by using techniques described earlier, involving collection and analysis of volatile products as well as analyses of residues at different temperatures. The decomposition o…
The strong temperature dependence of the flow stress of body-centred cubic metals at temperatures below ∼0·1 Tm has generally been attributed to the inherent lattice friction of the b.c.c. structure (the Peierls stress). To test this hypothesis, very high purity (with regard to interstitials) tantalum single crystals…
The low‐temperature viscosities of two series of sodium aluminosilicate glasses were measured by the fiber elongation method. The results suggested that a modification of the Day and Rindone structural model for sodium aluminosilicate glasses was necessary. The modified model suggests that additional (AlO ½ ) − groups…
The present paper, dealing with nylons 66, 610, and 612, is part of a study on a series of polyamides as crystallized from solution. The lath-shaped crystallization products, aggregated in the form of sheaves, possess the characteristics of chain-folded single crystals. In particular, they can be collected in the form…
By use of Fourier-integral representations and lattice orthogonality relations, Madelung sums are cast in a form which explicitly separates contributions due to crystal symmetry from those due to the detailed arrangement of neighboring ions. The usefulness and mathematical soundness of the method are demonstrated by v…
Summary Pelitic rocks were followed from unmetamorphosed clays and marls of Upper Triassic and Lower Liassic to anchimetamorphosed phyllites of the Alpine border region in Switzerland. Phengite and Al‐rich chlorite formed from mixed‐layer illite/montmorillonite; pyrophyllite from kaolinite. For the formation of parago…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of enzymic formation of homogentisate from p-hydroxyphenylpyruvateBengt Lindblad, Goran Lindstedt, and Sven LindstedtCite this: J. Am. Chem. Soc. 1970, 92, 25, 7446–7449Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published…
Abstract The crystallization of elemental selenium has been studied in light of present concepts of crystallization in organic polymers. Bulk‐crystallization kinetic data as measured by a dynamic density technique and spherulite growth‐rate data as measured by optical microscopy are presented for the temperature range…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of rare earth antimonate pyrochlores and cathodoluminescence of europium(3+) in 3Gd2O3.Sb2O5D. K. NathCite this: Inorg. Chem. 1970, 9, 12, 2714–2718Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1…
Diffusion and stress profiles were determined in an Na‐for‐Li exchanged Li 2 O‐Al 2 O 3 ‐SiO 2 glass as a function of the time of reheating in air. Comparison of the two sets of data by a thermal‐stress analogy gave a fair correlation, although the depth of the compressive layer was overestimated by about 16%. Stress…
Article Ein neues Verfahren zur Bestimmung der Oberflächenform und der inneren Struktur von gelösten globulären Proteinen aus Röntgenkleinwinkelmessungen was published on December 1, 1970 in the journal Zeitschrift für Physikalische Chemie (volume 72, issue 4_6).
Conventional thermogravimetry, differential thermal analysis, and evolved gas analysis were used to study the thermal decomposition of reagent‐grade FeSO 4 ·7H 2 O and of freeze‐dried FeSO 4 ·H 2 O in oxidizing and inert atmospheres. The mechanism depends on the atmosphere but is the same for the freeze‐dried and conv…
Mössbauer spectra at 4.2°K were taken with 197Au in several aurous and auric compounds. For each oxidation state a linear correlation was observed between the isomer shift (IS) and the quadrupole splitting (QS). Both the IS and QS varied over wide ranges in both auric and aurous compounds. Neither IS nor QS alone coul…
Abstract The intercalation of several highly polar organic compounds into kaolinite and the formation of interlamellar complexes has been examined by X-ray diffraction. Some compounds intercalate directly into kaolinite, while others can only be intercalated by the displacement of a previously intercalated compound. T…
Abstract When kaolinite undergoes percussive grinding, pronounced changes take place in its i.r. absorption spectrum even in the earliest stages of the grinding when the lattice is not yet destroyed. In this report, attention is directed to the change in the stretching bands of the hydroxyl ions. A remarkably rapid ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum efficiencies of transition-metal complexes. I. d-d LuminescenceGlenn A. Crosby and James N. DemasCite this: J. Am. Chem. Soc. 1970, 92, 25, 7262–7270Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 19…