Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The proposed roles of Cys148 and Asp179 in deoxycytidylate (dCMP) hydroxymethylase (CH) have been tested using site-directed mutagenesis. CH catalyzes the formation of 5-(hydroxymethyl)-dCMP, essential for DNA synthesis in phage T4, from dCMP and methylenetetrahydrofolate. CH resembles thymidylate synthase (TS), an en…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and spectroscopic properties of the encapsulated cobalt(III) complexes derived from the unsymmetrically substituted ligand 5-methyl-5-(4-amino-2-azabutyl)-3,7-dithianonane-1,9-diamine (N4S2)Therese M. Donlevy, Lawrence R. Gahan, Trevor W. Hambley, and Robert Strang…
Abstract Sulphation of cellulose was performed in an homogeneous aprotic system with SO 3 or CISO 3 H, resp., via O‐trimethylsilyl celluloses as reactive intermediates. Na‐cellulose sulphates completely soluble in water and showing small chain degradation could be obtained at DS s ≥ 0.25. The DS s in the range between…
Ceria‐stabilized tetragonal zirconia polycrystals were obtained by thermal treatment of amorphous powder prepared by the sol–gel method. Detailed XRD profile analysis was employed to study microstructural disorder and crystallite size and shape; in particular, no fluctuation of stoichiometry was found, the main cause…
Etude par diffraction RX de la photoisomerisation de [Co(NH 3 ) 5 NO 2 ]Cl 2 . Cristallisation dans C2/c avec Z=4, T=116K. Avant illumination avec une lampe Xe, a=10.176, b=8.692, c=10.746A, β=95.45°, affinement jusqu'a R=0.028. Apres illumination pendant 40min, R=0.042 et pendant 150min, R=0.062. Variations des param…
Very strong sharp lines in luminescence of Tm 3+ have been observed in Li-codoped ZnS:Tm phosphor. In particular, blue emission intensity was stronger as compared with that of infrared emission when the codoped Li concentration in ZnS:Tm was 0.1 at.%. As ZnS:Tm emits a broad band and very weak Tm 3+ lines, the role of…
Unit-cell dimensionsfor synthetic alunite and natroalunite formed at 450°C are a=6.981, c=17.331A and a=6.9786, c=16.696A, respectively. Synthetic alunite-natroalunite solid solutions show a linear variation in c with mole fraction Na, but this trend is obscured in natural samples by heterogeneities in Na content. The…
Experimental studies on the dielectric constants of KH2PO4 type ferroelectrics below the Curie temperature Tc are reviewed with special emphasis to the anomalously large dielectric constant and its abrupt decrease in the low temperature region called domain freezing. The origin of the large dielectric constant below T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransient effects in the interaction between polypyrrole and methanol vaporPatrice Topart and Mira JosowiczCite this: J. Phys. Chem. 1992, 96, 21, 8662–8666Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992h…
Determination de seize structures cristallines des trichloroacetates de cuivre II dimeriques. Dans les cristaux dans lesquels la valeur de -2J est petite (inferieure a 200cm -1 ), la geometrie de coordination autour de l'atome Cu est deformee d'une pyramide carree (SP) vers une bipyramide rhomboedrique (TBP) et la dis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitranions and their precursors: charge density rearrangements and nitrogen-15 NMR chemical shift changesCarlo Gatti, Alessandro Ponti, Aldo Gamba, and Giorgio PaganiCite this: J. Am. Chem. Soc. 1992, 114, 22, 8634–8644Publication Date (Print):October 1, 1992Publication Hist…
We develop a multiple-scattering description of the inelastic scattering by spin excitations of low-energy electrons reflected from the surface of a ferromagnetic material. The scattering efficiency per unit solid angle is expressed in terms of an appropriately defined frequency- and wave-vector-dependent susceptibili…
We present an alternative approach to the calculation of long-time diffusion coefficients of dense suspensions. The main idea is to approximate friction coefficients rather than the diffusion coefficients. Within this scheme we derive a very simple yet accurate theory of dynamic properties of a hard-sphere suspension:…
Strontium titanate thin films have been prepared on p-type Si(100) substrates by radio frequency (rf) magnetron sputtering. The films were deposited at 400 °C and annealed at various temperatures. The thin films were polycrystalline and the crystallinity of films was increased by annealing. The SrTiO3 thin films were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTitania coating of a microporous carbon surface by molecular adsorption-depositionAkihiko Matsumoto, Kazuo Tsutsumi, and Katsumi KanekoCite this: Langmuir 1992, 8, 10, 2515–2520Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published in…
This document is the first volume of a three-volume report to provide generic and site-specific estimates of radiation dose for exposures to residual radioactive contamination after the decommissioning of facilities licensed by the US Nuclear Regulatory Commission (NRC). Details are provided of the generic scenario an…
Abstract Transmission electron microscopy (TEM) was utilized to determine the origins of berthierine and chlorite in the core of the footwall alteration zone of the Kidd Creek massive sulfide deposit, Ontario. TEM images show lamellar intergrowths of packets of berthierine, mixed-layer chlorite/berthierine, Fe-Mg chlo…
Simple analytical functions derived from our point source Monte Carlo calculations on the combined attenuation and scatter factor, B exp(-mu r), for 60Co, 137Cs, 198Au, 192Ir, 241Am, 125I (models 6702 and 6711) brachytherapy sources and the nuclide 99Tcm, for water spherical geometries of radii R = 15 and 20 cm, are p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSulfidation of limestone-derived calcinesEvangelos A. Efthimiadis and Stratis V. SotirchosCite this: Ind. Eng. Chem. Res. 1992, 31, 10, 2311–2321Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://pubs…
The nucleation of diamond on highly oriented pyrolytic graphite (HOPG) substrates using hot-filament-assisted chemical-vapor deposition has been studied. Significant differences were observed between the basal {0001} and prism plane {hk*0} surfaces, and for various pretreatments of these surfaces. Observed nucleation…