Materials Literature
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A convenient method for the description of orientation data for cubic, hexagonal, tetragonal and orthorhombic crystals is given. The method can also be used for the representation of disorientation data, where disorientations between any two crystals of the specified symmetry lattices are considered. It is based on th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen chemisorption and laser Raman spectroscopy of unsupported and silica-supported molybdenum oxideA. N. Desikan, L. Huang, and S. T. OyamaCite this: J. Phys. Chem. 1991, 95, 24, 10050–10056Publication Date (Print):November 1, 1991Publication History Published online1 May…
ABSTRACT Thermal degradation of chlorophylls and chlorophyllides in spinach puree was studied from 100 to 145°C (2–25 min) for chlorophylls and from 80 to 115°C (2.5–39 min) for chlorophyllides. The derivatives formed were: pheophorbides, pyropheophorbides, pheophytins and pyropheophytins. Degradation kinetics of chlo…
A synthetic peptide that is 60 amino acids in length and corresponds to the homeobox sequence of antennapedia protein (pAntp) is specifically and efficiently captured by neurons in culture and conveyed to their nuclei. The internalization process is followed by a strong induction of neuronal morphological differentiat…
The relationships between the environments of cations in alkali silicates measured by X-ray absorption fine structure (XAFS) and magic angle spinning nuclear magnetic resonance (MASNMR) are considered. Both are consistent with the modified random network for glass structure in which modifiers form channels percolating…
Improvements in the shape determination method based on multipole expansion [Stuhrmann (1970), Z. Phys. Chem. (Frankfurt am Main), 72, 177–198] are described. Fast algorithms for evaluating shape scattering from the multiple coefficients are developed. The relationship between the resolution in real and reciprocal spa…
Eight different fibers were studied to examine upconversion as a function of erbium concentration below 1000 ppm by weight. These experiments and a computer model of two-particle upconversion made it possible to estimate the upconversion coefficient used in a rate-equation model. A strong correlation was found between…
The formation, lateral growth, and melting of crystals of polyethylene were studied. At pressure (P) 2-5 kbar and temp. (T) supercoolings ?10 Deg, all crystal growth occurred in the hexagonal (h) phase, and only in this phase, regardless of whether in the h or orthorhombic (o) stability regime of the P-T phase diagram…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of random ethylene copolymersR. G. Alamo and L. MandelkernCite this: Macromolecules 1991, 24, 24, 6480–6493Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/do…
Polylysine covalently linked to moieties of gadopentetate (Gd-DTPA), for use as a macromolecular blood pool marker for contrast material-enhanced magnetic resonance imaging (MRI), was characterized by means of physicochemical measurements and pharmacokinetics in rats and rabbits and compared with Gd-DTPA. Gd-DTPA-poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge transfer across oblique bisporphyrins: two-center photoactive moleculesAnne M. Brun, Anthony Harriman, Valerie Heitz, and Jean Pierre SauvageCite this: J. Am. Chem. Soc. 1991, 113, 23, 8657–8663Publication Date (Print):November 1, 1991Publication History Published onl…
Abstract The synthesis and utilization of electrodes modified with conducting polymers is reviewed. Specific issues evaluated include the various approaches available to produce the required functionality at the electrode surface and the practical considerations to be addressed during synthesis, both in terms of hardw…
Descriptions of biofilms and their elemental compositions based on scanning electron micrographs and energy dispersive x-ray analysis cannot be related to the original condition of the biofilm on the surface. Solvent replacement of water removes extracellular polymeric material and reduces the concentration of element…
Nitrogen-containing hydrogenated amorphous carbon (a-C:H(N)) films are grown from a dc plasma of a N2+C6H6 gas mixture. By varying the N2 fraction in this mixture films with different amounts of N are produced. The actual amount of nitrogen in the a-C:H(N) films is determined by nuclear reaction analysis and by Auger…
Abstract In well NJ‐15 of the Nesjavellir geothermal field, Iceland, the transition of discrete smectite into discrete chlorite has been studied from drill cuttings recovered at depths of less than 1714 m and over a continuous range of temperatures between 60 and 300° C. At temperatures below 180° C, the clay fraction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of an electric field on block copolymer microstructureKarl Amundson, Eugene Helfand, Don D. Davis, Xina Quan, Sanjay S. Patel, and Steven D. SmithCite this: Macromolecules 1991, 24, 24, 6546–6548Publication Date (Print):November 1, 1991Publication History Published on…
Nerve growth factor (NGF) is critical to the development and maintenance of the peripheral nervous system, but its possible roles in other organ systems are less well characterized. We have recently shown that human epidermal melanocytes, pigment cells derived from the neural crest, express the NGF receptor (p75 NGF-R…
A new model structure is proposed for the silk I form of the crystalline domains of Bombyx mori silk fibroin and the corresponding crystal form of poly(L-Ala-Gly). It was deduced from conformational energy computations on stacked sheet structures of poly(L-Ala-Gly). The novel sheet structure contains interstrand hydro…
Core losses in rotating electrical machines have been estimated through direct use of the standard Epstein loss data of the employed magnetic laminations, without introducing empirical correcting factors. The prediction is based on a numerical finite element approach to magnetic flux distribution, coupled to a physica…
The extent to which local strain is present in the polypeptide backbone of folded protein molecules has been examined. The occurrence of steric strain associated with nonproline cis peptide bonds and energetically unfavorable main chain dihedral angles can be identified reliably from the well ordered parts of high res…