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Earlier covalent modification experiments indicated that histidine, arginine, and carboxylic acid residues were involved in the catalytic mechanism of the acid phosphatase enzyme from human prostate. The present study utilizes site-directed mutagenesis to evaluate the catalytic importance of 7 residues of human prosta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral Poly(dipentylsilylene) CopolymersHolger Frey, Martin Moeller, and Krzysztof MatyjaszewskiCite this: Macromolecules 1994, 27, 7, 1814–1818Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.…
The high-potential iron-sulfur protein (iso-form II) isolated from Ectothiorhodospira vacuolata has been crystallized and its three-dimensional structure determined by molecular replacement procedures and refined to 1.8-A resolution with a crystallographic R factor of 16.3%. Crystals employed in the investigation belo…
Abstract Samples of natural clinoptilolite modified by treatment with NH 4 Cl or HCl solutions, followed by thermal treatments, have been characterized, and their catalytic activity evaluated, in o-xylene isomerization and ethanol dehydration reactions. The substitution of the compensating cations by NH4+ does not pro…
Abstract Solutions of the stationary and time‐dependent equations of diffusion are presented for contamination when scanning a rectangular area in the scanning electron microscope (SEM). A method is described to record the thickness of the contamination layer by the signal of secondary or backscattered electrons and t…
The mono- and trisubstituted peroxyniobium polyoxotungstates of formulas [(CH3)3NH]7[Si-(NbO2)3W9O37], Cs7[Si(NbO2)3W9O37], alpha-K5[Si(NbO2)W11O39] and alpha-[(CH3)3NH]5[Si(NbO2)-W11O39], have been prepared, purified, and characterized spectroscopically by 29Si NMR, 183W NMR, and IR. The presence of peroxo groups was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Poly(carborane-siloxane-acetylene)Leslie J. Henderson and Teddy M. KellerCite this: Macromolecules 1994, 27, 6, 1660–1661Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https:…
Polymer‐protected bimetallic clusters areexcellent candidates as catalysts for various chemical reactions. For Example, Cu/Pd clusters accelerate the hydration of acrylonitrile (See Figure). However, hurdles femain to be overcome in their preparation. Following a brief overview of preparative techniques, details are g…
Attenuation of Syrian hamster 3-hydroxy-3-methyl-glutaryl coenzyme A reductase (HMG-CoA reductase, EC 1.1.1.34) activity by in vitro phosphorylation was studied using AMP-activated protein kinase and wild-type and mutant forms of HMG-CoA reductase. The only residue of the wild-type enzyme phosphorylated was Ser871. Su…
The thermal conductivities of solid layers of thicknesses from 0.01 to 100 μm affect the performance and reliability of electronic circuits, laser systems, and microfabricated sensors. This work reviews techniques that measure the effective thermal conductivity along and normal to these layers. Recent measurements usi…
Cooperative magnetic interactions have been observed in α‐[MnPc][TCNE], which results from the reaction of manganese phthalocyanine with tetracyanoethylene. This is the latest in a series of molecule based materials found to exibit such unusual magnetic behaviour. The α polymorph displays very strong magnetic coupling…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTFormation and Interaction of Carbonyls and Nitrosyls on Gold(I) in ZSM-5 Zeolite Catalytically Active in NO Reduction with COShilun Qiu, Ryuichiro Ohnishi, and Masaru IchikawaCite this: J. Phys. Chem. 1994, 98, 11, 2719–2721Publication Date (Print):March 1, 1994Publication Histo…
The numerical approach, proposed by us in an associated paper, is further developed here to account for the processes of ordering and disordering in a 2D idealized elasto-plastic body. Study of the kinetic and structural aspects of such processes reveals various features characteristic of the glass transition and stru…
Simplified preparative procedures are described for the generation of α-[PW_(11)O_(39)Cr^(III)(OH_2)]^(4-) and α2-[P_2W_(11)O_(61)Cr^(III)(OH_2)]^(7-) anions which can be readily oxidized, chemically or electrochemically, to α-[PW_(11)O_(39)Cr^(V)O]^(4-) and α2-[P_2W_(17)O_(61)Cr^(V)O]^(7-). The oxidized complexes are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Investigations of the Complexes Resulting from the Acid-Promoted Deoxygenation and Dimerization of (N,N'-Ethylenebis(salicylideneaminato))oxovanadium(IV)Eishun Tsuchida, Kimihisa Yamamoto, Kenichi Oyaizu, Naoki Iwasaki, and Fred C. AnsonCite this: Inorg. Chem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization Conditions and the Development of a Core-Shell Morphology in PMMA/PS Latex Particles. 1. Influence of Initiator Properties and Mode of Monomer AdditionJan-Erik Joensson, Helen Hassander, and Bertil ToernellCite this: Macromolecules 1994, 27, 7, 1932–1937Public…
Multilayer systems comprising brittle materials can exhibit substantially different behaviors under flexural and tensile loadings. The present article addresses the origins of such differences, with emphasis on the modeling of the flexural stress–strain response. Systems with both a deterministic tensile strength and…
The numerical approach, proposed by us in the accompanying papers, is applied here to simulate the plastic response of a 2D idealized elasto-plastic body under conditions of loading with constant strain rates. Various kinetic and structural aspects of plastic flow are extensively studied. The results of numerical simu…
The first synthesis of the corrole ring by self-condensation of a monopyrrolic unit is reported. The reaction occurs only in the presence of cobalt ions; it leads to the formation of (triphenylphosphine)(5,10,15-triphenyl-2,3,7,8,12, 13,17,18-octamethylcorrolato)cobalt(III), [Co(OMTPC)PPh3] and represents the first ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced Electron Transfer within Zeolite Cavities: cis-Stilbene Isomerization Photosensitized by 2,4,6-Triphenylpyrylium Cation Imprisoned inside Zeolite YAvelino Corma, Vicente Fornes, Hermenegildo Garcia, Miguel A. Miranda, Jaime Primo, and Maria-Jose SabaterCite this…