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4,344 Newest Publications about the topic sulfur

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Characterization of a Cobalt-Specific P1B-ATPase

25-Sep-2012 | Eliza L. Zielazinski; George E. Cutsail, III; Brian M. Hoffman; Timothy L. Stemmler; Amy C. Rosenzweig, Biochemistry, 2012

The P1B-type ATPases are a ubiquitous family of P-type ATPases involved in the transport of transition metal ions. Divided into subclasses based on sequence characteristics and substrate specificity, these integral membrane transporters play key roles in metal homeostasis, metal tolerance, and ...

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General Acid–Base Catalysis Mediated by Nucleobases in the Hairpin Ribozyme

25-Sep-2012 | Stephanie Kath-Schorr; Timothy J. Wilson; Nan-Sheng Li; Jun Lu; Joseph A. Piccirilli; David M. J. Lilley, Journal of the American Chemical Society, 2012

The catalytic mechanism by which the hairpin ribozyme accelerates cleavage or ligation of the phosphodiester backbone of RNA has been incompletely understood. There is experimental evidence for an important role for an adenine (A38) and a guanine (G8), and it has been proposed that these act in ...

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Hypercrosslinked Large Surface Area Porous Polymer Monoliths for Hydrophilic Interaction Liquid Chromatography of Small Molecules Featuring Zwitterionic Functionalities Attached to Gold Nanoparticles Held in Layered Structure

25-Sep-2012 | Yongqin Lv; Zhixing Lin; Frantisek Svec, Analytical Chemistry, 2012

A novel approach to porous polymer monoliths hypercrosslinked to obtain large surface areas and modified with zwitterionic functionalities through the attachment of gold nanoparticles in a layered architecture has been developed. The capillary columns were used for the separation of small ...

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Subregional survey of aroma compounds in Marlborough Sauvignon Blanc wines

24-Sep-2012 | S. JOUANNEAU, R.J. WEAVER, L. NICOLAU, M. HERBST‐JOHNSTONE, F. BENKWITZ, P.A. KILMARTIN, Australian Journal of Grape and Wine Research, 2012

Abstract Background and Aims Marlborough is the largest wine‐growing region in New Zealand and Sauvignon Blanc varieties represent over 60% of the vineyard area. The main compounds responsible for the most intense aromas in Sauvignon Blanc wines have been assumed to be methoxypyrazines and ...

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Electromerism and linkage isomerism in biologically-relevant Fe-SO complexes

24-Sep-2012 | Mihai Surducan, Dora Lup, Alexandru Lupan, Sergei V. Makarov, Radu Silaghi-Dumitrescu, Journal of Inorganic Biochemistry, 2012

Sulfur monoxide, SO, is a relatively unstable molecule whose metal-coordinating properties have received little attention in bioinorganic chemistry. Reported here is a density functional theory (DFT) examination of the four possible oxidation states for a heme-SO/OS adduct previously proposed to ...

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Recovery of Elemental Sulfur During the Ammoniacal Leaching of Copper Sulfide

22-Sep-2012 | I. G. Reilly, D. S. Scott, Metallurgical and Materials Transactions B, 2012

Results of a preliminary study of the ammoniacal leaching of synthetic covellite (CuS) in an aqueous oxidizing system in the presence of a nonmiscible organic sulfur solvent are described. Up to 60 pct of the sulfur can be recovered from the solvent as elemental sulfur while achieving high ...

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Thermodynamics of the System Fe−Mn−S: Part III. Equilibria Involving Solid and Liquid Phases in the Temperature Range 1100 to 1300°C

22-Sep-2012 | Manfred Fischer, Klaus Schwerdtfeger, Metallurgical and Materials Transactions B, 2012

The equilibria between cubic (Fe,Mn)S solid solutions and sulfur rich liquid have been measured in the temperature range 1100 to 1300°C, and those between cubic (Fe,Mn)S and hexagonal ‘FeS’ at 1100°C. Gas phases consisting of H2S-H2 mixtures were used as atmospheres. Further, isosulfur-activity ...

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Thermodynamics of the System Fe-Mn-S: Part II. Solubility of Sulfur and Manganese in γ-Iron Coexisting with Sulfide in the Temperature Range 1100 to 1300°C

22-Sep-2012 | Manfred Fischer, Klaus Schwerdtfeger, Metallurgical and Materials Transactions B, 2012

Iron platelets containing known contents of manganese were reacted with gas phases of controlled pH2S/pH2 ratios. After quenching, the sulfur contents of the samples were analyzed chemically, and the platelets were investigated microscopically to determine if sulfide inclusions had been formed. ...

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The Interfacial Kinetics of the Reaction of CO2 with Nickel. Part I: The 14CO2-CO Exchange Reaction and the Influence of Sulfur

22-Sep-2012 | A. W. Cramb, W. R. Graham, G. R. Belton, Metallurgical and Materials Transactions B, 2012

The rate of dissociation of CO2 on nickel has been studied by means of the 14CO2-CO exchange reaction. For pure polycrystalline nickel between 500 and 1240°C the forward rate constant, in mole cm−2 s−1 atm−1, is given by: lnkf = - 7300/T - 2.57. This is shown to be closely consistent with ideal ...

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The Dissolution of Sphalerite in Ferric Chloride Solutions

22-Sep-2012 | J. E. Dutrizac, R. J. C. Macdonald, Metallurgical and Materials Transactions B, 2012

The kinetics of dissolution of both sintered sphalerite disks and untreated sphalerite particles in ferric chloride-hydrochloric acid solutions have been investigated. Over the temperature interval 25 to 100°C, the dissolution occurred according to a linear rate law and with an associated ...

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