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  • Organic sulfur isolation  (1)
  • organic sulfur turnover  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Formation and mineralization of organic sulfur in forest soils (1984)
    Springer
    Biogeochemistry 1 (1984), S. 79-95 
    Details
    ISSN: 1573-515X
    Keywords: Organic sulfur formation ; organic sulfur turnover ; forest floor and soil horizons ; regulation ; energy availability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The incorporation of sulfur from inorganic sulfate into organic matter was examined using35S for O1, O2 and A-horizon samples from two hardwood forests located at the Coweeta hydrologic laboratory, near Franklin, NC. This temperature-dependent transformation was stimulated by increased availability of sulfate or energy and the process was inhibited by sodium azide, erythromycin and candicidin. These data suggest that bacteria and fungi mediate sulfur incorporation via the formation of the covalent linkages. The latter possibility was confirmed by characterization of the organic sulfur fraction after isolation and partial purification from O2 layer material. Evidence is presented which indicates that the sulfur of this fraction is subject to mineralization after depolymerization of the carbon matrix and methods are given for the direct and indirect assessment of potential turnover rates. The availability of sulfate from mineralization appears to depend upon the rate of incorporation of sulfur into organic matter. Thus, substantially higher levels of extractable sulfate were detected when turnover of the isolated organosulfur fraction was assayed for in the presence of azide, an inhibitor of sulfate incoporation. However, the reverse was true when turnover was monitored in the presence of glucose and succinate which stimulate sulfate incorporation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181122
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation and partial characterization of forest floor and soil organic sulfur (1985)
    Springer
    Biogeochemistry 1 (1985), S. 155-167 
    Details
    ISSN: 1573-515X
    Keywords: Organic sulfur isolation ; forest floor and soil ; C:N:S ratios ; ester sulfate content ; hydriodic acid reduction ; HCl hydrolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The formation of organic sulfur from inorganic sulfate was investigated in hardwood forest floor and mineral horizons. All samples converted sulfate-sulfur into a non-salt extractable form which was recoverable only under conditions which release organic matter. This conversion was inhibited by azide, and depending upon the horizon, by erythromycin, candicidin, chloramphenicol and tetracycline. The form of sulfur generated in the 02 forest floor layer and in Al-horizon soil was characterized after isolation by pyrophosphate extraction at pH 8. The organosulfur extracts exhibited an average C:N:S ratio of 103:6:1. The ester sulfate content of the 02 extract was 61% by hydriodic acid (HI) reduction and 62% by hydrolysis in 3N HCl at 121 °C. However, compared to hydrolysis, reduction yielded lower estimates of ester sulfate for two of the three soil extracts analyzed. In view of the electrophoretic heterogeneity of all extracts, it is suggested that some may contain stable ester linkages that hydrolyze only after prolonged treatment and that the standard procedure for HI-reduction may provide conditions of temperature and contact time with the acid which are insufficient for the release of sulfate from these esters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185039
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    Paper (German National Licenses)
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