Materials Literature
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1. Desmosine and isodesmosine were separated by ion-exchange and paper chromatography, after acid hydrolysis of purified elastin from beef ligamentum nuchae. The fractions obtained by ion-exchange chromatography were clearly mixtures of related compounds. The desmosine fraction could be resolved into seven compounds a…
Crystal data of three compounds in the system SeO2–CuO have been determined from X-ray single-crystal and powder studies. CuSe2O5 is monoclinic, space group Cc or C2/c, with a = 12.254 (5), b = 4.858 (3), c = 7.960 (3) Å, β = 110.7 (1)°, Z = 4. CuSeO3 is monoclinic, space group P21/c, with a = 7.718 (2), b = 8.266 (3)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition metal ions in high formal oxidation states. Structural characterization of the nickel and copper complexes of the 1,1-dicarboethoxy-2,2-ethylenedithiolate ligandD. Coucouvanis, F. J. Hollander, and M. L. CafferyCite this: Inorg. Chem. 1976, 15, 8, 1853–1860Publica…
An examination has been made of the effects of carbon, nitrogen, molybdenum, titanium, and niobium on the occurrence of 485°C embrittlement in 25%Cr ferritic stainless steels. All these alloying additions increase the rate of precipitation, as measured by the rate of age hardening. In general the tensile strength and…
Heat capacity of BaTiO 3 has been measured in the vicinity of the ferroelectric-to-paraelectric transition temperature by using both the crystal grown by the top-seeded solution technique and that grown by the flux method. It is found that the temperature dependence of the heat capacity over a rather wide temperature…
Abstract The gelatin film is stretched more 100% over 75% relative humidity, while the dried gelatin extended only several percent. In this experiment the gelatin film was stretched in a solution of water and ethanol. The sample was extended to 650% of its initial length when ethanol/water was 1.5(w/w) at 30°C. The wi…
A review is given of the use of tolyltriazole (also called tolutriazole, but more strictly 4-, 5-, or 6-methyl-1 H-benzotriazole) as an inhibitor for copper and brass in a variety of corrosive environments. The effect of a pretreatment with an aqueous solution of tolyltriazole was not as effective as one with benzotri…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Abstract In Cu‐doped ZnO crystals the Fermi level is varied by additional donor doping (In or H) in the energy range 0 to 250 meV below the bottom of the conduction band. The results of optical absorption and electrical conductivity measurements carried out in these crystals can be explained by using the model in whic…
Abstract Die wasserfreien Tetrathioantimonate von K + , NH 4 + und Na + kristallisieren kubisch im (NH 4 ) 3 SbS 4 ‐Typ, während bei den bisher bekannten Alkalitetrathioarsenaten und ‐phosphaten der (NH 4 ) 3 AsS 4 ‐Typ beobachtet wird. Die Ausbildung der beiden unterschiedlichen Strukturtypen wird auf Packungseffekte…
Although marine waters are usually found to be supersaturated with respect to both calcite and aragonite, natural precipitation of these carbonate minerals is very restricted. This is apparently due to the occupancy and effective removal of lattice sites by random organic molecules present in natural seawater. Despite…
Abstract The Raman spectra of oriented single crystals of Copper (II) sulphate and selenate at 290 K and 150 K are reported and compared. Assignments are proposed for numerous internal modes of the crystals. Raman scattering tensors are calculated for the normal modes of (SO 4 ) 2− and (SeO 4 ) 2− and compared with ex…
Abstract The reflectance of V 2 O 5 , single crystals is measured between 20 and 2000 cm −1 . Eleven resonances are observed: six with E ∥ a , two with E ∥ b , and three with E ∥ c . Values of ϵ 0 are obtained separately from thin crystal channel spectra: ϵ 0 = 37.2 with E ∥ a and 20.1 with E ∥ c . The reflectance dat…
Tlrroe-dimensional counter-collected X-ray and neutron single-crystal data have been used to refine the crystal structure of a tremoilite (N%.uotrG.us Car.sorxMgsxAl6.e2ssi?.,67)O,2(OHr.$rFo.ooClo.orz); a
The biosynthetic pathways of norvaline homoisoleucine were examined using regulatory mutants of leucine biosynthesis in Serratia marcescens. alpha-Isopropylmalate synthetase [EC 4.1.3.12], the first enzyme of leucine biosynthesis, catalyzed the condensations of acetyl-CoA with pyruvate, alpha-ketobutyrate, alpha-ketov…
Honoclinic sulfur is the form which is stable at normal pressure from 95°C to the melting point (115°).Below 95° the orthorhombic form ("rhombic sulfur") is stable, but pure crystals of the metastable monoclinic form can be preserved for weeks at room temperature.Sands 2 determined the structure of the monoclinic crys…
Summary Some properties of the collagens of myocommata and skin from three species of fish are described. The musculature of hake separates readily into flakes because of intrinsic weakness in the connective tissue. The corresponding tissue of catfish is unusually strong and holds the musculature together under almost…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChromium(II) porphyrins and an irreversible dioxygen complexStephen K. Cheung, Carol J. Grimes, Janice Wong, and Christopher A. ReedCite this: J. Am. Chem. Soc. 1976, 98, 16, 5028–5030Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural isomers of 1:12 and 2:18 heteropoly anions. Novel and unexpected chiralityMichael T. PopeCite this: Inorg. Chem. 1976, 15, 8, 2008–2010Publication Date (Print):August 1, 1976Publication History Published online1 May 2002Published inissue 1 August 1976https://pubs.…
Using infrared spectroscopy, X-ray diffractometry, differential thermal analysis, scanning electron microscopy, solubility and dissolution rate measurements, it was demonstrated that the comminution of digoxin results in the appearance of an amorphous phase. The examination of spironolactone and 17 beta-oestradiol by…