The sulfur cycle was the first biogeochemical cycle to be discovered. In the 1880s, while studying Begiotoa (a bacterium that lives in sulfur-rich environments), Sergei Vinogradsky discovered that this bacterium oxidizes hydrogen sulfide (H2S) as an energy source and replenishes intracellular sulfur droplets. Vingradsky named this form of oxidation metabolism of mineral compounds (inorgoxidation) and […]