Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The purpose of this paper is to clarify whether intramolecular energy transfer in europium chelates occurs via the triplet state of the ligand. It is attempted to excite the triplet state of europium dibenzoylmethide (EuD) by utilizing intermolecular triplet-triplet energy transfer from lanthanum dibenzoylmet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear antiferromagnetism in dichloro(1,2,4-triazole)copper(II) and copper(II) benzoate trihydrateMotomichi Inoue, Shuji Emori, and Masaji KuboCite this: Inorg. Chem. 1968, 7, 7, 1427–1430Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Publ…
The structure of the utricle, a special envelope investing the oogonium, characteristic of the Mesozoic Charophyte family Clavatoraceae, is described in Perimneste horrida Harris and allied species. It shows a three-rayed symmetry, being formed by three similar trifurcately branched ramules bearing antheridia. The typ…
Abstract— Fluorescence and phosphorescence spectra of lumiflavine, riboflavine, FMN and FAD have been measured by continuous and flash excitation techniques. The differences in emission characteristics observed, show that the flavine side‐chains afect the singlet‐triplet transitions on which chemical and biological ac…
Crystal and magnetic structures of antiferromagnetic Mn 2 N were studied by means of neutron diffraction at 290°K, 230°K, and 120°K. An orthorhombic arrangement of nitrogen atoms in the octahedral interstices of hcp manganese lattice was found. The crystal structure is ζ-Fe 2 N type whose space group is D 2 h 14 - P b…
Abstract Flint clay is defined as a sedimentary, microcrystalline to crystalline clay (rock) composed dominantly of kaolin, which breaks with a pronounced conchoidal fracture and resists slaking in water. Additional ceramic (refractory) properties are implied, but not expressed, in the definition. Flint clay first giv…
A lactate racemase [EC 5.1.2.1] was isolated and purified about 190 fold in specific activity from the sonic extract of Lactobacillus sake. The purified preparation was almost homogeneous by ultracentrifugal and electrophoretical analyses. Characteristic properties of the enzyme were as follows: (a) absorption spectru…
Abstract Polycondensations of 1,4,5,8‐naphthalenetetracarboxylic acid (NTCA) with both 3,3′‐diaminobenzidine (DAB) and 1,2,4,5‐tetraaminobenzene tetrahydrochloride (TAB) in polyphosphoric acid (PPA) were found to produce soluble polymers which exhibit excellent thermal stabilities. Polymer structures were deduced from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFive-coordination with "hybrid" ligands. II. Nickel(II) complexes with polyfunctional arsenic-containing ligandsL. Sacconi, I. Bertini, and F. ManiCite this: Inorg. Chem. 1968, 7, 7, 1417–1420Publication Date (Print):July 1, 1968Publication History Published online1 May 2002…
The temperature dependence of the elastic constants of calcite have been investigated by the ultrasonic phase-comparison method from 25° to 375°C. The variation in the elastic constants and the elastic moduli of calcite is smooth and linear over the temperature range, and does not show the break in the variation of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic fulgides. Spectroscopy and mechanism of photoreactionsAzucena Santiago and Ralph S. BeckerCite this: J. Am. Chem. Soc. 1968, 90, 14, 3654–3658Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://…
Abstract Polyimide films from 4,4′‐diaminodiphenyl ether and pyromellitic dianhydride were pyrolyzed at 400–600°C. in non‐oxidative systems. Major gaseous products were carbon monoxide and carbon dioxide; hydrogen evolution occurred above 525°C. A mobile n ‐imide‐isoimide equilibrium is in accord with the gas evolutio…
The theory of grain growth in the presence of a liquid phase is examined using modifications of equations derived for coalescence of solid particles widely dispersed in a liquid. Although the grain diameter‐time relation can still be represented by d 3 = kt , the absolute growth rates are increased as the amount of li…
Abstract Von denen über Schmelzreaktionen in einer Stickstoffatmosphäre dargestellten Verbindungen KFeS 2 , RbFeS 2 und CsFeS 2 besitzt das RbFeS 2 nach Einkristalluntersuchungen einen dem KFeS 2 analogen Strukturaufbau (C 2h 6 –C2/c; Z = 4; a = 7,22; b = 11,70; c = 5,42 Å; β = 112,0°). CsFeS 2 kristallisiert rhombisc…
Abstract The morphology of the quenched form of polypropylene was investigated. Thin films of the quenched form consist of small ball‐like structures which we suggest are defective hexagonal crystals. In thicker films they aggregate to form spherulites with no observable fine structure. Quenching of thin films of molt…
The structures of thiourea, SC(NH2)2, and deuterated thiourea, SC(ND2)2, have been determined at room and liquid nitrogen temperatures from three-dimensional neutron diffraction data. No significant structural change on deuteration has been found. N—H⋯S hydrogen bonds occur in both materials at both temperatures with…
Abstract A procedure was developed for the determination of Si directly in citrate‐dithionite extracts of soils. The procedure, which provides for noninterference by citrate, dithionite, Fe, and P was developed for measurement of the absorbance of the reduced β‐molybdosilicic acid in the working range of 5 to 25 µg of…
Values of the parameter Vg/Vg are calculated for 100 kv electrons as a function of the reflection vector g for different crystal temperatures and for a number of different materials. It is shown that the usual assumption made, namely setting V0 ′ = Vg ′ = 0·1 Vg independent of g or material, is often a very poor appro…
Mason G. Fenwick, Lake Huron Distribution of Tabellaria fenestrata var. geniculata A. Cleve and Coelastrum reticulatum var. polychordon korshik, Transactions of the American Microscopical Society, Vol. 87, No. 3 (Jul., 1968), pp. 376-383
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy of formation of cerium sesquioxideFloyd B. Baker and Charles E. HolleyCite this: J. Chem. Eng. Data 1968, 13, 3, 405–407Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://doi.org/10.1021/je60038a03…