In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t a r t i c l e i n f o The distribution of sulfur isotopes in geological materials reveals information about ...

We investigated the potential role of the three strains of Thiobacillus caldus (KU, BC13, and C-SH12) in arsenopyrite leaching in combination with a moderately thermophilic iron oxidizer, Sulfobacillus thermosulfidooxidans. Pure cultures of T. caldus and S. thermosulfidooxidans were used as well as defined mixed cultures. By measuring released iron, tetrathionate, and sulfur concentrations, we ...

Reducing environmental pollution via elimination of sulfur compounds from gas condensate was the aim of this research. Whereby oxidative desulfurization from gas condensate with 3200 ppm initial sulfur was accomplished by hydrogen peroxide (30%wt) as oxidant and formic acid as catalyst. The sulfones after generation in the oxidation step were extracted through a method of liquid-liquid extracti...

T HE data in the literature do not clearly indicate the value of inorganic sulfur supplements in ruminant rations. Recently Garrigus et al. (1950) obtained data using a low-sulfur, semipurified ration which suggested that elemental sulfur could be utilized by sheep as measured by weight gains and wool growth. Block and Stekol (1950) showed that when NaoS~504 was administered orally to a cow the...

The iron-sulfur proteins of the cytochrome bc1 complexes of Schizosaccharomyces pombe and Saccharomyces cerevisiae contain the three amino acid motif RX( downward arrow)(F/L/I)XX(T/S/G)XXXX (downward arrow) that is typical for proteins that are cleaved sequentially in two steps by matrix processing peptidase (MPP) and mitochondrial intermediate peptidase (MIP). Despite the presence of this reco...

Transient-state experiments with the obligately autotrophic Thiobacillus sp. strain W5 revealed that sulfide oxidation proceeds in two physiological phases, (i) the sulfate-producing phase and (ii) the sulfur- and sulfate-producing phase, after which sulfide toxicity occurs. Specific sulfur-producing characteristics were independent of the growth rate. Sulfur formation was shown to occur when t...

Recently, the superconducting transition temperature ${T}_{c}=287\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ has been experimentally obtained in a material composed of carbon, sulfur, and hydrogen under high pressure 267 GPa. The structure is currently unknown, where carbon sulfur were added at molar ratio $1:1$. Here, fixing $\text{C}:\text{S}=1:1$, we studied several possible C-S-H structures, fo...

The course of the reaction of the cystine in wool with alkali has been reinvestigated. The earlier findings that one sulfur atom is split from each molecule of cystine are confirmed. Of the residual noncystine sulfur in the alka li-tregted wool, mbre than 25 percent has been accounted for as lanthionine. No signifi cant amounts of sulfhydryl groups are in the t reated wools. The results lead to...

Purple sulfur bacteria are photosynthetic, anaerobic microorganisms that fix carbon dioxide using hydrogen sulfide as an electron donor; many are also nitrogen fixers. Because of t h e ~ r requirements for sulfide or orgamc carbon as electron donors in anoxygenic photosynthesis, these bacteria are generally thought to be l im~ted to shallow, organic-nch, anoxic environments such as subtidal mar...

Title of Document: SULFUR ISOTOPE FRACTIONATIONS IN BIOLOGICAL SYSTEMS: INSIGHT INTO THE PROTEROZOIC BIOSPHERE David T. Johnston, Ph.D. 2007 Directed By: Professor J. Farquhar, Department of Geology and ESSIC This study focuses on developing a framework for interpreting isotopic fractionations in the four stable sulfur isotopes, with a special focus on microbial effects. Calculations of low tem...