Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual metalloporphyrins. XIV. Structure of [meso-tetraphenylporphinato]bis[tricarbonylrhenium(I)]David Cullen, Edgar Meyer, T. S. Srivastava, and M. TsutsuiCite this: J. Am. Chem. Soc. 1972, 94, 21, 7603–7605Publication Date (Print):October 1, 1972Publication History Publi…
Freshly deposited aluminum prepared under optimum conditions was overcoated with MgF(2) and LiF films at various deposition rates and substrate temperatures. The thickness of the dielectric films was precisely controlled by reflectance measurements at lambda = 1216 A. The thicknesses of the MgF(2) and LiF films were c…
Abstract Melt‐crystallized poly(ethylene terephthalate) and etched oligomer lamellae from the same polymer have been annealed under vacuum at temperatures between 200 and 260°C and times between 3 and 48 hr. The annealed samples were analyzed through determination of viscosity‐average molecular weight, x‐ray low‐angle…
Excessive reactivity of silicon-bearing steels in hot-dip galvanizing is well known. No adequate explanation exists as to why silicon should be so effective in destabilizing the layers of Fe-Zn intermetallies allowing free access of zinc to the reaction interface and causing linear kinetics to persist throughout the g…
The saturation magnetization (Ms) and intrinsic coercive force (Hc) of spinel-structured CoFe2O4–Co3O4 samples were measured in the quenched condition and also after aging inside the miscibility gap which is present below 860°K in this system. Magnetic properties were interpreted through correlation with the sample's…
Abstract An inflammation having an acute and a prolonged phase was induced by the injection of carrageenan into the paw of rats inoculated with adjuvant 6 days previously (adjuvant-carrageenan-induced inflammation, ACII). Steroidal and acidic non-steroidal anti-inflammatory drugs were effective on both phases. Basic n…
The effects of specimen granularity in the reflection method of powder diffractometry are isolated by comparing the fluorescent intensity from a large number of Cu powder specimens to that from a polished bulk sample. The fluorescence radiation is excited by monochromatic Mo Kα radiation. An approximate relationship b…
Tyrosine, added to the growth medium of a strain of Escherichia coli K-12 lacking transaminase B, repressed the tyrosine, phenylalanine, and tryptophan aminotransferase activities while leaving the aspartate aminotransferase activity unchanged. This suggested that the aspartate and the aromatic aminotransferase activi…
Epoxidation of perfluoroolefins to perfluoroepoxides has made a new class of monomers available. Perfluoroepoxides undergo facile ring-opening reactions with nucleophiles which under the proper reaction conditions can lead either to poly-perfluoroethers or to other classes of fluorocarbons previously unavailable or av…
The absorption and fluorescence spectrum in the region of 6500 cm −1 (1·54 μm) due to trivalent erbium has been studied in a wide range of silicate, phosphate and borate glasses. Representative spectra have been used to determine the cross section for stimulated emission and relative gain coefficient as a function of…
The displacement field around an edge dislocation core is examined in an attempt to quantitatively modify the linear elastic Volterra solution. The approach derives from a computer simulation to obtain the equilibrium atomic positions in a dislocated bcc crystallite using Johnson's potential to model α-iron. Unlike ma…
Chymotryptic cleavage of α1‐CB6, the C‐terminal CNBr peptide of the α1‐chain from calf skin collagen, yields three peptides, designated C1 (positions 1–113), C2 (positions 114–196) and C3 (positions 197–217), respectively. The present paper describes the amino acid sequence of C2. It was determined exclusively by appl…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The magnetic properties of a number of samples of synthetic Fe 3 S 4 have been studied using both static magnetization measurements and Mössbauer effect spectrometry. The distinction is made between the intrinsic properties of bulk Fe 3 S 4 and observations resulting from superparamagnetic behavior and nonstoichiometr…
An expression is derived for the conductivity due to variable range hopping in a density of states which varies as a power of the energy from the Fermi level. The derivation is also given for the case of two-dimensional hopping.
Amyloid fibrils and the aminoterminal variable fragment of some Bence Jones proteins are known to have Congo red affinity and, after staining, to exhibit dichroism, polarization birefringence and a green polarization color. X-ray crystallographic analysis demonstrates the presence in these preparations of a 4.72-4.76Å…
The interaction of a protein inhibitor with the catalytic subunit derived from adenosine 3′,5′-monophosphate-dependent protein kinase is described. A kinetic analysis of casein phosphorylation in the presence of inhibitor reveals a noncompetitive interaction between the inhibitor and the catalytic subunit substrates,…
Cordierite sector trillings, which are found well developed in some A1-rich volcanic rocks and pelitic buchites, are thought to have formed initially as hexagonal high cordierite crystals. Subsequent ordering of the (Al, Si) configuration in the crystal structure would have produced the present orthorhombic modificati…
Abstract Comparison of the reflectance spectrum of cellulose with that of myoinositol, cycloheptaamylose, and other model compounds indicates that the acetal linkage does not contribute significantly to the absorption peak at 260 nm. The spectra of photolyzed and photo‐oxidized cellulose suggest that ketonic carbonyl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of aliphatic monoaminomonocarboxylic acidsP. G. Simmonds, E. E. Medley, M. A. Ratcliff, and G. P. ShulmanCite this: Anal. Chem. 1972, 44, 12, 2060–2066Publication Date (Print):October 1, 1972Publication History Published online1 May 2002Published inissu…