Materials Literature
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The effects of temperature on the assembly of collagen fibrils were examined in a system in which collagen monomers are generated de novo and in a physiological buffer by specific enzymic cleavage of type I pC-collagen, an intermediate in the normal processing of type I procollagen to type I collagen. Increasing the t…
Electrochemical copolymerization of pyrrole and thiophene has been accomplished using an acetonitrile solution containing 0.1 M thiophene and pyrrole. The production of copolymers was evidenced by IR measurements of the resulting polymers and their electrochemical properties. The electrochemical behavior of the copoly…
ABSTRACT Adsorption behavior of microcrystalline cellulose, guar gum, wheat bran and oat bran were compared at 4, 25, and 37°C. Guar gum adsorbed the most water and microcrystalline cellulose adsorbed the least. Adsorption abilities of oat bran and wheat bran were similar at low and intermediate water activity levels.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of iron(II) nitrilotriacetate and iron(II) ethylenediamine-N,N'-diacetate complexes with hydrogen peroxideJ. D. Rush and W. H. KoppenolCite this: J. Am. Chem. Soc. 1988, 110, 15, 4957–4963Publication Date (Print):July 1, 1988Publication History Published online1 Ma…
Preparation and magnetic properties of ThMn12-type phases R,Fe,Mo,(Co), R=Y, Ce, Nd, Sm, Gd, Dy, Er are described. The ternary material, without Co, exhibits saturation magnetization up to 1 T and Curie temperature up to 215 °C, the quaternary material, with Co, up to 1.2 T, and 295 °C, respectively.
Ethylene enhanced the senescence of cucumber (Cucumis sativus L. cv ;Poinsett 76') cotyledons. The effect of 10 microliters per liter ethylene was inhibited by 1 millimolar silver thiosulfate, an inhibitor of ethylene action. An increase in proteins with molecular weights of 33 to 30 kilodaltons and lower molecular we…
The formation of mullite in diphasic aluminosilicate gels of stoichiometric composition was studied by quantitative X‐ray diffraction (QXRD) and electron microscopy (AEM and SEM). The transformation is preceded by an incubation time which is apparently an activated process with an activation energy of 236 ± 15 kcal/(g…
Two constitutive acetyl-CoA acetyltransferases (3-ketothiolases A and B) were purified from Alcaligenes eutrophus. Enzyme A was active with only acetoacetyl-CoA and 3-ketopentanoyl-CoA, whereas enzyme B was active with all the 3-ketoacyl-CoAs (C4−C10) tested. Enzyme A appeared to be a tetramer (Mr 70 000) with identic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of nickel(II) and copper(II) complexes of 14-membered hexaaza macrocycles, 1,8-dimethyl- and 1,8-diethyl-1,3,6,8,10,13-hexaazacyclotetradecaneMyunghyun Paik Suh and Shin Geol KangCite this: Inorg. Chem. 1988, 27, 14, 2544–2546Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[S4Cd17(SPh)28]2-, the first member of a third series of tetrahedral [SWMX(SR)y]z- clustersGarry S. H. Lee, Don C. Craig, Ida. Ma, Marcia L. Scudder, Trevor D. Bailey, and Ian G. DanceCite this: J. Am. Chem. Soc. 1988, 110, 14, 4863–4864Publication Date (Print):July 1, 1988P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteractions of metals and protons with algaeRay H. Crist, Karl. Oberholser, Dwight. Schwartz, James. Marzoff, Darryl. Ryder, and DeLanson R. CristCite this: Environ. Sci. Technol. 1988, 22, 7, 755–760Publication Date (Print):July 1, 1988Publication History Published online1…
The surface structure and properties of miscible blends of polystyrene (PS) with poly(vinyl methyl ether) (PVME) have been studied as a function of the blend composition and constituent molecular weights. The lower surface tension of the PVME compared to that of PS results in preferential adsorption of PVME at the sur…
A systematic study of the magnetic properties of a series of ${R}_{2}$${\mathrm{Fe}}_{14}$B (R denotes a rare-earth element) compounds has been made using a combined molecular-field and crystalline-electric-field (CEF) approximation. The Hamiltonian for an R ion is (in units of ${\ensuremath{\mu}}_{B}$) ${\mathrm{scrH…
The Shubnikov-de Haas (SdH) effect has been observed in the recently discovered ambient-pressure organic superconductor ${[\mathrm{b}\mathrm{i}\mathrm{s}(\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{y}\mathrm{l}\mathrm{e}\mathrm{n}\mathrm{e}\mathrm{d}\mathrm{i}\mathrm{t}\mathrm{h}\mathrm{i}\mathrm{o}\mathrm{l}\mathrm{o})\pha…
Serum transferrin is a metal-binding glycoprotein, molecular weight ca. 80,000, whose primary function is the transport of iron in the plasma of vertebrates. The X-ray crystallographic structure of diferric rabbit serum transferrin has been determined to a resolution of 3.3 A. The molecule has a beta alpha structure o…
Abstract The composition and the chemical states of components of Zircaloy‐4 (zirconium alloy) surfaces were studied in the temperature range between room temperature and 500°C. Each sample was kept at constant temperature (25, 100, 200, 300, 400, 500°C) for up to 16 hours. The changes of composition and chemical stat…
Experiments were performed on a compact tension specimen of AISI(1) 316L stainless steel (SS) to determine its susceptibility to intergranular environmentally assisted cracking in 288 C water. Crack growth rates were measured using a reversing DC potential drop technique as a function of mechanical loading variables i…
A comparative study of the AC (60 Hz) surface aging in a fog chamber is reported on cylindrical rod samples of high-temperature vulcanized (HTV) silicon rubber and ethylene propylene diene monomer (EPDM) rubber containing various amounts of alumina trihydrate (ATH) and/or silica fillers. In low-conductivity (250- mu S…
A graphical and numerical method of calculating and minimizing losses in windings, that generalizes previous findings, has been introduced. Using electromagnetic theory and MMF diagrams in both space and time a method is proposed that provides insight into the mechanism of skin and proximity effect losses and that als…
Experimental and theoretical cross-section data for electron impact ionization of atoms and ions from fluorine to nickel has been assessed and earlier recommendations for light atoms and ions have been revised. Based on this assessment and, in the absence of any data, on the classical scaling laws a recommended cross…