Geothrix fermentans is a species of Gram-negative, rod-shaped, anaerobic bacteria belonging to the genus Geothrix within the family Geothrichaceae. It was first isolated from aquatic environments and is known for its ability to reduce iron (Fe³⁺) under anaerobic conditions, playing a role in biogeochemical cycling of iron and organic matter.
Overview:
Geothrix fermentans was described in scientific literature based on strains obtained from freshwater sediments. It is a strictly anaerobic bacterium capable of coupling the oxidation of organic acids and carbohydrates to the reduction of ferric iron (Fe(III)), making it relevant to studies of microbial metal reduction and environmental remediation. It may also ferment certain organic substrates, contributing to its ecological function in anoxic habitats such as sediments and groundwater systems.
Etymology/Origin:
The genus name Geothrix is derived from the Greek words "geo" (earth) and "thrix" (hair), referring to its filamentous morphology and soil or sediment habitat. The species epithet fermentans is Latin for "fermenting," indicating its ability to ferment organic compounds.
Characteristics:
- Cell morphology: Rod-shaped, often forming filaments.
- Metabolism: Capable of both Fe(III) reduction and fermentation. Utilizes various organic acids (e.g., acetate, succinate) and carbohydrates as electron donors.
- Physiology: Strictly anaerobic, non-spore-forming, motile via flagella in some strains.
- Habitat: Freshwater sediments, subsurface environments.
- 16S rRNA gene sequence analysis places it within the class Negativicutes of the phylum Bacillota (formerly Firmicutes).
Related Topics:
- Iron-reducing bacteria
- Anaerobic respiration
- Biogeochemical cycling
- Microbial fuel cells
- Bioremediation
- Geothrix genus
Accurate information is limited to peer-reviewed microbiological studies, primarily from original taxonomic descriptions and related environmental microbiology research.