Sulfur cycle

Sulfur cycle

Sulfur is part of amines and other key molecules such as coenzyme A, where it is in reduced form (mainly as a sulfhydryl group) and NADPH. Plants and other primary producers obtain it in their liquid form, mainly as sulfate ion (SO4) which, after being reduced, is incorporated into its proteins in solid form. The organisms that ingest these plants in turn incorporate them into their proteins, and in this way pass to the organisms of the upper trophic level. When dying, the reduced sulfur of the proteins enters the cycle of the sulfur and is oxidized by bacteria so that the plants can assimilate (sulfate) and the animals can digest.

Sulfur exchanges, mainly in the form of sulfur dioxide SO2, occur between aquatic, terrestrial and marine communities, in one way or another in the atmosphere, rocks and oceanic sediments or pavements, where the sulfur is stored. Atmospheric SO2 dissolves in rainwater or is deposited as a dry vapor. The local recycling of sulfur, mainly in the form of sulfate ion and sulfide, is carried out in both cases. A part of the hydrogen sulphide (H2SOC), produced during the local recycling of the sulphide, oxidizes and forms SOL69.

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