The Azotobacter vinelandii rhodanese is a 31kDa sulfurtransferase protein that catalyzes the transfer of sulfur atom from thiosulfate to cyanide in the detoxification process from cyanide and is able to insert sulfur atom in the iron-sulfur cluster. A study of the uniformly 15N isotopic labeling by high resolution NMR, before obtaining the backbone sequential assignment, has been carried out. T...

The biogeochemical cycling of sulfur (S) was studied during the 2000 snowmelt at Sleepers River Research Watershed in northeastern Vermont, USA using a hydrochemical and multi-isotope approach. The snowpack and 10 streams of varying size and land use were sampled for analysis of anions, dissolved organic carbon (DOC), S activity, and dS and dO values of sulfate. At one of the streams, dO values...

A continuous flow method (CF-IRMS) for the rapid determination of the sulfur isotope composition of sulfide and sulfate minerals has significant advantages over the classic extraction method in terms of the reduced sample quantity and a rapid analytical cycle of less than 8 min/ analysis. For optimum performance, the technique is sensitive to a number of operating parameters, including sample w...

(34)S enrichment is shown to occur during sulfurization reactions and for the first time conclusively attributed to an isotope equilibrium effect rather than selective addition of (34)S enriched nucleophiles.

Sulfur has been proposed as a useful element to employ in addition to carbon and nitrogen in stable isotope studies of marine food webs, but variability in dS of primary producers may prevent food web resolution. dS values in green leaves of the seagrass, Zostera capricorni, showed considerable variability (12.7–17.6x) in a survey in Moreton Bay, Australia. We demonstrated that dS values were c...

H. B. Franz, A. C. McAdam, D. W. Ming, C. Freissinet, P. R. Mahaffy, D. L. Eldridge, W. W. Fischer, J. P. Grotzinger, C. H. House, J. A. Hurowitz, S. M. McLennan, S. P. Schwenzer, D. T. Vaniman, P. D. Archer, Jr., S. K. Atreya, P. G. Conrad, J. W. Dottin III, J. L. Eigenbrode, K. A. Farley, D. P. Glavin, S. S. Johnson, C. A. Knudson, R. V. Morris, R. Navarro-González, A. A. Pavlov, R. Plummer, ...