Materials Literature
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Abstract Further examination of the active site region in our X-ray crystallographic model of subtilisin BPN' reveals a hydrogen-bond network that bears a remarkable resemblance to the one found in a- chymotrypsin. It involves the side chains of the reactive Ser-221, His-64, Asp-32 and Ser-33. Otherwise the two enzyme…
It is proposed that the temperature of mesomorphic-isotropic phase changes and of transitions between mesophases may be markedly shifted by manageable electric fields. First experiments demonstrating such a shift in the nematic-isotropic transition of $p$-ethoxybenzylidene-${p}^{\ensuremath{'}}$-aminobenzonitrile are…
A new electric-field-induced color range, in which colors change from blue to red with increasing field, has been observed in cholesteric liquid crystals. Observations of this new color range quantitatively confirm the theories of Meyer and de Gennes and enable identification of the specific nature of the electric-fie…
Zinc phosphate coatings are composed of a maze of crystals on steel surfaces and act as absorptive media for organic materials. These coatings find extensive use in the automotive, appliance, and building trade industries. A brief review is given of the processes occurring during the formation and growth of the crysta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitation in Elemental AnalysisH. KaiserCite this: Anal. Chem. 1970, 42, 2, 26A–59APublication Date (Print):February 1, 1970Publication History Published online23 May 2012Published inissue 1 February 1970https://pubs.acs.org/doi/10.1021/ac60286a722https://doi.org/10.1021/…
The thermal diffusivity k d of silicon between - 50°C and 100°C has been obtained by measuring the phase-shift of a thermal wave between two points on a small sample. The relation between the thermal diffusivity and phase-shift is obtained by solving the heat flow equations. The present results agree closely with thos…
A method of computing the electrostatic potential and electron trajectories in electron guns of the electron microscope type is described. Potentials are computed digitally using the successive over-relaxation technique, using two different mesh sizes. Electron trajectories are computed by a predictor-corrector method…
Three methods to calculate the current distribution, both in magnitude and phase, throughout the cross section of a single-turn coil are presented. The methods are analytical for computer computations in that exact solutions would be obtained if round-off errors could be avoided completely. The numerical procedure, wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExistence of HMgX compoundsEugene C. Ashby, R. A. Kovar, and K. KawakamiCite this: Inorg. Chem. 1970, 9, 2, 317–324Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 February 1970https://pubs.acs.org/doi/10.1021/ic50084…
A description is given of an electron energy analyser, which consists of two wienfilters, for measuring electron energy losses in solids. One wienfilter serves as a compensator-corrector for the other. This means that the resolution of the analyser is not affected by the instabilities of the power supplies, and no ene…
Abstract The formation constants of chromium (III) complexes with iminodiacetic acid (IDA) and l-aspartic acid (Asp) as the terdentate ligands were determined by the pH method in the ionic strength, μ=0.1 and at 25°C: their values were logk1=10.9 and logk2=10.5 for IDA and logk1=10.1 and logk2=9.5 for Asp, respectivel…
Minoru Tanaka, Gentaro Yamaguchi, Jiro Shiokawa, Chiyoe Yamanaka; Mechanism and Rate of the Intramolecular Energy Transfer in Rare Earth Chelates, Bulletin
Cellulose decrystallized by swelling in liquid ammonia produced a simpler thermogravimetric analysis curve than obtained from ordinary cellulose—presumably because of a decrease in the intermolecular char-forming reactions. By using a graphical procedure which permits a linear plot of the thermogram, it was possible t…
The decomposition of Cu(OH)2 on electron irradiation and thermal treatment has been investigated by X-ray diffraction, thermo-analytical and electron microscopic methods. A sudden, reversible elongation of the c axis of Cu(OH)2 at about 50°C has been found and the topotactic relation between Cu(OH)2, CuO and Cu2O esta…
During pyrolysis of pure cellulose, the Crystallinity Index (Crl) remained fairly constant over more than 50% weight loss before dropping rapidly as the X-ray pattern deteriorated. With samples first treated with trace quantities of inorganic salts, heating first increased the Crl—the results implying a preferentially…
Densification of MgO with LiF additions depends on the formation of a liquid that is initially a lubricant for rearrangement of particles and later a material transport medium for pressure–enhanced liquid–phase sintering. The rate–controlling process in the latter stage is viscous flow of the liquid through grain–boun…
Abstract Feinteiliger Anatas wurde mit NaF‐Lösungen umgesetzt. Dabei werden OH‐Gruppen der TiO 2 ‐Oberfläche durch F − ersetzt. In ungepufferter Lösung oder bei pH‐Werten am oder wenig über dem isoelektrischen Punkt (pH 6,6) wird nur die Hälfte der vorhandenen OH‐Gruppen. Zugleich tauschen die übrigen, sauren OH‐Grupp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible intramolecular photodimerization of 1,3-bis(.alpha.-naphthyl)propaneEdwin A. Chandross and Carol J. DempsterCite this: J. Am. Chem. Soc. 1970, 92, 3, 703–704Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer and far-infrared studies of tetrahaloferrate anions of the type FeCl4-nBrn-C. A. Clausen III and Mary L. GoodCite this: Inorg. Chem. 1970, 9, 2, 220–223Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Published inissue 1 Febru…
Abstract The widths at half‐value of high‐resolution NMR spectra of bound water of cellulose were studied in relation to the temperature change. Two points were made clear: First, the amount of bound water of the cellulose sample can be pointed out with higher accuracy the lower the temperature of the measurement. Sec…