My primary approach to the study of sulfur cycling has been experimental, based on the use of radiotracers and other methods to determine the rates and pathways of individual processes. The results were integrated with geochemical data and checked by simple transport reaction modelling. Often, the experimental and the modelled rates did not compare well. In an attempt to understand why, I learned to distinguish between net and gross processes and developed the concept of cryptic cycling. The results were also compared with microbiological data to better understand how the physiological potential and constraints of microorganisms control the biogeochemical processes....
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