Materials Literature
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The glucose permease (IIGlc/IIIGlc complex) of the bacterial phosphotransferase system mediates sugar transport across the cytoplasmic membrane concomitant with sugar phosphorylation. It contains 3 cysteine residues, of which Cys-204 and Cys-326 are localized in the hydrophobic part and Cys-421 in the hydrophilic part…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of metalloporphyrins and viologens at zeolite Y-modified electrodes: evidence for electron trapping by monomolecular porphyrin layersZhuyin Li, Chong Mou Wang, Lalchan Persaud, and Thomas E. MalloukCite this: J. Phys. Chem. 1988, 92, 9, 2592–2597Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock copolymers at interfaces. 1. Micelle formationMark R. Munch and Alice P. GastCite this: Macromolecules 1988, 21, 5, 1360–1366Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/m…
We have studied the reactions occurring for the deposition of chromium onto pyromellitic dianhydride-4,4′-oxydianiline (PMDA-ODA) polyimide for a wide range of metal coverages, using x-ray photoelectron spectroscopy as well as solution studies of model compounds. A multistep, coverage-dependent mechanism is proposed w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLattice models for bulk polymers at interfacesDoros N. TheodorouCite this: Macromolecules 1988, 21, 5, 1391–1400Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988https://pubs.acs.org/doi/10.1021/ma00183a035https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and thermodynamics of bulk homopolymer solid interfaces: a site lattice model approachDoros N. TheodorouCite this: Macromolecules 1988, 21, 5, 1400–1410Publication Date (Print):May 1, 1988Publication History Published online1 May 2002Published inissue 1 May 1988htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel triple-cubane type organometallic oxide clusters: [MCp*MoO4]4.nH2O (M = Rh and Ir; Cp* = C5Me5; n = 2 for Rh and 0 for Ir)Yoshihito. Hayashi, Koshiro. Toriumi, and Kiyoshi. IsobeCite this: J. Am. Chem. Soc. 1988, 110, 11, 3666–3668Publication Date (Print):May 1, 1988Pu…
Abstract A new method for the synthesis of compact, multifunctional star‐shaped polystyrenes was designed. A plurifunctional metalorganic initiator is obtained upon reaction of potassium naphthalene with commercial divinylbenzene. The resulting polymeric “core” exhibits a number of metalorganic sites. In a subsequent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a series of polyimides derived from 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]bis[1,3-isobenzofurandione]G. Ronald Husk, Patrick E. Cassidy, and Karen L. GebertCite this: Macromolecules 1988, 21, 5, 1234–1238Publication Date (Print…
The effect of argon ion bombardment on the structure and properties of thick copper films was studied. Primary deposition variables were ion flux, ion energy, substrate temperature, and substrate type. The effects of ion bombardment are profoundly different at high energy (600 eV) as opposed to low energy (62 eV). Tre…
Abstract— Zinc phthalocyanines sulfonated to different degrees are tested for their ability to sensitizeV–79 Chinese hamster cells andEMT–6 mouse mammary tumors to red light. In vitro , the lower sulfonated derivatives were the most active with the exception of the poorly water‐soluble monosulfonated dye. An isomeric…
Layer structures in chiral smectic C ( S C * ) phases were studied by high-resolution X-ray diffraction. The existence of a chevron layer structure was confirmed even in thick cells such as 350 µm and even in a compound with the phase sequence of N * - S C * . Cells made by a SiO oblique-evaporation technique gave two…
The results of photoionization mass spectrometric studies on B2H6, and BH3 (produced by pyrolysis of B2H6) are presented. The photoion yield curves of B2H+n (n=2–6) and BH+n (n=2–3) from B2H6, as well as BH+n (n=1–3) from BH3 have been obtained. It is shown that the combination of appearance potential measurements for…
The edge curling wall (ECW) is observed in an optical Kerr microscope. Conditions are derived energetically favoring single transverse domains with ECWs over other multiple closure domains or single longitudinal domains that are undesirable because of their low permeability. Computed figures illustrate how the maximum…
ABSTRACT The term nuclear matrix was first introduced by Berezney & Coffey (1974) to denote a highly structured residual framework obtained from rat liver nuclei by sequential salt extractions, detergent and nuclease treatments. The isolated three-dimensional structure consisted almost entirely of protein. Subsequ…
Abstract A typical intumescent fire retardant additive for polypropylene, which is a mixture of ammonium polyphosphate and pentaerythritol, does not sensibly modify the photooxidative behaviour of unstabilized polypropylene whereas it modifies that of polypropylene stabilized with a substituted o‐hydroxybenzophenone a…
The temperature dependences of the dielectric properties, conductivity, spontaneous polarization as well as the effect of hydrostatic pressure on the anomalies of these properties have been investigated. The β-TlInS2 crystals are shown to be often a mixture of the polytypes. Transition into a ferroelectric state for s…
There is considerable interest in understanding the surface oxidation reactions of transition-metal alloys with potentially useful magnetic properties. These reactions can either lead to passivation or corrosion of the magnetic film under normal atmospheric conditions. Little is known, however, about the surface oxida…
The purpose of this Recommended Practice is to familiarize users with the issues involved with processes using toxic, flammable, or corrosive gases for the deposition or etching of semiconducting, metallic, or insulating films. We examine the general concerns for handling these gases, discuss the nature of several pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of sequence distribution on the critical composition difference in copolymer blendsJohan Van Hunsel, Anna C. Balazs, Ronald Koningsveld, and William J. MacKnightCite this: Macromolecules 1988, 21, 5, 1528–1530Publication Date (Print):May 1, 1988Publication History Pub…