Materials Literature
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Quantitative study of the capillary density of normal dermis of 113 biopsy specimens taken from 20 body sites from 6 cadavers was carried out. Histologic quantification of dermal capillaries using the alkaline phosphatase method to delineate vascular endothelium and automated image analysis demonstrates statistically…
The crystal structures of vanadinite tpb5(VO)3Cll and pyromorphite [Pbs@Od3Cl] have been refined to R : 0.022,0.021, respectively, using three-dimensional X-ray data. The atomic arrangement of pyromorphite is con_ firmed as an apatite isostructure. In the structures the pb polyhedra show little response to the tetrahe…
Abstract The validity of the saddle/001 method for estimating the percentage of smectite layers in randomly interstratified illite/smectite (I/S) minerals as a routine laboratory technique has been examined with respect to the effects of the crystallite size distribution (N = number of layers) of I/S and the degree of…
Abstract Measurements are described of characteristic stress‐strain properties in tension for several representative partially crystalline polymers prepared by cooling from the melt. Striking differences were found in the natural draw ratio, ranging from 2x to 11x. They are interpreted in terms of a simple molecular m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of monomers containing functional silyl groups. 7. Porous membranes with controlled microstructuresJae Suk Lee, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1989, 22, 6, 2602–2606Publication Date (Print):June 1, 1989Publication History Published…
We tried to control immunolabeling conditions so that information about antigen concentration could be achieved by quantifying labeling patterns. Working with immunogold labeling procedures in ultrathin cryosections, we observed that differential penetration of immunoreagents causes considerable differences in labelin…
The electrochemical behavior of copper in 0.5 M deaerated sulfuric acid in the absence and presence of benzotriazole (BTAH) and ferric ions has been investigated with rotating disk electrodes. The BTAH inhibitive effect initiates at concentrations as low as 10−7 M. The mechanism of Cu/Cu(II) reaction is the same in th…
Static fatigue of dental ceramics results from the interaction of residual tensile stress and an aqueous environment. This phenomenon is a potential cause of delayed crack formation and propagation in ceramic or metal-ceramic restorations. For dental ceramics, the influence of microstructural defects such as porosity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe use of very crowded silylamide ligands -N(SiMenPh3-n)2(n = 0, 1, or 2) to synthesize crystalline, two-coordinate, derivatives to manganese(II), iron(II), and cobalt(II) and the free ion [Ph3SiNSiPh3]-Hong Chen, Ruth A. Bartlett, H. V. Rasika Dias, Marilyn M. Olmstead, an…
Possible modulated structures of icosahedral quasicrystals are investigated. The modulated phases are regarded as lower symmetric phases where the global icosahedral symmetry of quasicrystals is broken due to mode locking of phason degrees of freedom. With the help of group theory, nonvanishing phason fields are calcu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase separation in diblock-copolymer melts: ordering of micellesA. N. SemenovCite this: Macromolecules 1989, 22, 6, 2849–2851Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.acs.org/doi/10.1021…
Nuclear respiratory-defective mutants of Saccharomyces cerevisiae have been screened for lesions in the mitochondrial alpha-ketoglutarate dehydrogenase complex. Strains assigned to complementation group G70 were ascertained to be deficient in enzyme activity due to mutations in the KGD1 gene coding for the alpha-ketog…
Are colloids large clusters? Both can be stabilized by simple low‐molecularweight ligands, as was demonstrated by complexation of gold colloids with the water‐soluble phosphane Ph 2 PC 6 H 4 SO 3 Na. This approach allows not only the study of gold colloids in aqueous solution at any desired concentration, but also the…
The title compound (Phen* =phenanthroline derivative) contains the magic number of 309 Pt atoms. In contrast to one-, two-, and five-shell clusters, four-shell clusters were previously unknown. Thus, the preparation of 1 helps bridge the gap between complexes and bulk metals. The Pt atoms in 1, like those in metallic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiolytic production and properties of ultrasmall cadmium sulfide particlesDavid Hayes, Olga I. Micic, M. T. Nenadovic, V. Swayambunathan, and Dan MeiselCite this: J. Phys. Chem. 1989, 93, 11, 4603–4608Publication Date (Print):June 1, 1989Publication History Published onlin…
This experiment illustrates the formation of tris(phenanthroline)cobalt complexes in the +2 and +3 oxidation states, the effect of coordination on reactions of the ligand, and the use of a ligand displacement reaction in recovering the transformed ligand.
The need for improved coatings on low‐density reusable surface insulation (RSI) materials used on the space shuttle has stimulated research into developing tougher coatings. The processing of a new porous composite “coating” for RSI called toughened unipiece fibrous insulation is diseassed. Characteristics including p…
A bacterial strain, Pseudomonas sp. strain NK87, that can use 6-aminohexanoate-cyclic dimer as the sole source of carbon and nitrogen was newly isolated from wastewater of a factory which produces nylon-6. Two responsible enzymes, 6-aminohexanoate-cyclic-dimer hydrolase (P-EI) and 6-aminohexanoate-dimer hydrolase (P-E…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polynitrocyclobutane derivativesT. G. Archibald, L. C. Garver, K. Baum, and M. C. CohenCite this: J. Org. Chem. 1989, 54, 12, 2869–2873Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 June 1989https://pubs.ac…
The transition of copper oxide thin films from CuO to ${\mathrm{Cu}}_{2}$O during vacuum annealing has been studied by transmission electron microscopy and Rutherford backscattering spectroscopy. Dark field images show that isolated and large ${\mathrm{Cu}}_{2}$O grains emerge from the small CuO grain matrix. The abru…