Materials Literature
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A study has been made of the strength characteristics of machined glass‐ceramic surfaces using an indentation flaw technique. The strength is found to decline or increase with progressive removal of the machining damage layer by a polishing procedure, depending on whether the indentation is made after or before the po…
The sequence of 437 amino acid residues of porcine heart citrate synthase [citrate oxaloacetate-lyase (pro-3S-CH2COO leads to acetyl-CoA), EC 4. 1. 3. 7] has been determined by the alignment of fragments generated by cleavage with cyanogen bromide and with trypsin. Isolation of the peptides was facilitated by recent d…
Abstract The morphology of binary and ternary polyolefin blends of polypropylene (PP), ethylene‐propylene‐diene terpolymer (EPDM) and polyethylene (PE) following processing by injection and compression molding has been examined by optical and scanning electron microscopy. Internal surfaces were generated by low temper…
The structure of a vacuum-deposited polycrystalline film of zinc phthalocyanine, C32H16N8Zn, has been investigated by high-resolution electron microscopy. With the aid of a minimum-dose system, the molecular arrangements in crystals were observed and the existence of at least three polymorphs were confirmed in the fil…
We report the isolation and chemical characterization of collagen cross-linking compounds, 3-hydroxypyridinium and dihydroxylysinonorleucine, from human urine.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface studies on multicomponent polymer systems by x-ray photoelectron spectroscopy: polystyrene/poly(ethylene oxide) homopolymer blendsH. Ronald Thomas and James J. O'MalleyCite this: Macromolecules 1981, 14, 5, 1316–1320Publication Date (Print):September 1, 1981Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving polymerization of epoxide catalyzed by the porphyrin-chlorodiethylaluminum system. Structure of the living endTakuzo Aida and Shohei InoueCite this: Macromolecules 1981, 14, 5, 1166–1169Publication Date (Print):September 1, 1981Publication History Published online1 Ma…
Abstract Preirradiation grafting of acrylic acid onto poly(tetrafluoroethylene) film was studied. The trapped radicals formed upon irradiation are able to induce graft polymerization under appropriate conditions. The influence of the grafting conditions were analyzed kinetically. The grafting reaction begins close to…
Experimental studies of the diamond (111) surface are presented. While no intrinsic surface states have been found on the 1×1 surface, our new results in ultraviolet photoemission spectroscopy (15 eV?hν?25 eV) show evidence of a band of surface states on the 2×2/2×1 reconstructed surface. The band of surface states (w…
XPS measurements of core-level binding energies have been used to determine the interface Fermi-level position in (100) and (110) n-and p-type GaAs samples as a function of surface treatment. A variation in interface Fermi-level position of up to 0.7 eV has been observed. The difference in interface Fermi-level positi…
A molecular dynamics simulation of crystallization by the process of spontaneous homogeneous nucleation for a model of 4000 soft spheres with periodic boundary conditions is reported. When the amorphous system in the metastable state, at a point for which classical homogeneous nucleation theory predicts a vanishing of…
Surface photovoltage spectroscopy with clean 2×1 reconstructed Si(001) surfaces revealed indirect transitions from the bulk valence band into a band of empty surface states at (0.59 ± 0.04) eV above it. Chemisorption of atomic hydrogen is known to finally produce a Si(001)− 1×1:H structure and was found to remove thes…
In addition to its known effect in suppressing the deacetylation of the nucleosomal core histones, sodium butyrate in the concentration range 0.5 to 15 mM causes a selective inhibition of [32P]phosphate incorporation into histones H1 and H2A of cultured HeLa S3 cells. No commensurate general inhibition of phosphorylat…
Abstract Seventeen well‐drained pedons were sampled in Pennsylvania and northern West Virginia. Sixteen of the pedons had well‐expressed Spodosol morphology while one had very marginal Spodosol morphology. These pedons were classified according to Soil Taxonomy and the Canadian soil classification system. The degree o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of solutions and gels of poly(4-methyl-1-pentene) in cyclohexane and decalin by viscosimetry, calorimetry, and x-ray diffraction. A new crystalline form of poly(4-methyl-1-pentane) from gelsShaul M. Aharoni, Gerard Charlet, and Genevieve DelmasCite this: Macrom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlame retardant viscose rayon containing a pyrophosphateRainer WolfCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 3, 413–420Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 September 1981https://pubs.acs.org/do…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline morphology of isothermally crystallized branched polyethyleneM. Glotin and L. MandelkernCite this: Macromolecules 1981, 14, 5, 1394–1404Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 September 1981https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of the χ parameter for poly(dimethylsiloxane) solutions by the UNIFAC group contribution methodMoshe GottliebMoshe GottliebMore by Moshe Gottlieb and Mordechay HerskowitzMordechay HerskowitzMore by Mordechay HerskowitzCite this: Macromolecules 1981, 14, 5, 1468–14…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical activity induced in terbium(III) tris(pyridine-2,6-dicarboxylate) through association with certain chiral amino acidsHarry G. BrittainCite this: Inorg. Chem. 1981, 20, 9, 3007–3013Publication Date (Print):September 1, 1981Publication History Published online1 May 200…