Mössbauer study of iron minerals transformations by Fuchsiella ferrireducens

Siderite-based anaerobic iron cycle driven by autotrophic thermophilic microbial consortium

“…Our experiments clearly show the capability of an autotrophic thermophilic microbial consortium to perform anaerobic oxidation of hydrothermal siderite. We demonstrate that the process of anaerobic iron oxidation coupled with acetate production, which has been previously shown for alkaliphiles 17 , 27 , 28 , is likely to have wider distribution and could be performed by microbial communities inhabiting pH-neutral thermal environments.…”

“…The ability of these organisms to carry out anaerobic Fe(II) oxidation has never been tested. However, the proposed phylogenetic relations between Fe(III)-reducing and Fe(II)-oxidising EET pathways 38 , 42 as well as the demonstration of the ability of G. ferrireducens and F. ferrireducens to reduce and oxidise iron minerals under anoxic conditions 17 , 27 , 32 support such a possibility.…”

“…Thermodynamic calculations supported this suggestion 17 . Further investigations demonstrated the ability of alkaliphilic autotrophic acetogenic bacterium Fuchsiella ferrireducens , as well as a syntrophic culture of G. ferrihydriticus and Candidatus “Contubernalis alkalaceticum” to oxidise siderite anaerobically in the presence of ethanol 27 , 28 .…”

Iron Transformation and Its Role in Phosphorus Immobilization in a UCT-MBR with Vivianite Formation Enhancement

“…This suggests that the growth/aging of vivianite crystals was likely occurring when Fe II oxidation became marginal in this aerated sludge system (Figure and Table ). Although the transformation of iron-bearing minerals has been widely studied in both chemical and biological systems, ,− this is the first report demonstrating the stability of vivianite crystals and their growth in aerated activated sludge. Thompson et al reported that Fe-oxide crystallinity in soil increased during redox oscillations.…”

Natronogracilivirga saccharolytica gen. nov., sp. nov. and Cyclonatronum proteinivorum gen. nov., sp. nov., haloalkaliphilic organotrophic bacteroidetes from hypersaline soda lakes forming a new family Cyclonatronaceae fam. nov. in the order Balneolales

“…Soda lakes are a special type of inland salt lakes located in the semiarid or arid climatic zones and characterized by high (≥9.0) pH caused by the presence of carbonate and bicarbonate ions and often by high mineralization resulting in extremely high alkaline buffering capacity. Intensive study of soda lakes performed during the last 30 years resulted in understanding that despite extreme parameters they characterized by high level of biomass production and active biogeochemical carbon, nitrogen, sulfur and iron cycling caused by the activity of functionally and phylogenetically diverse microorganisms, mainly rep-resented by prokaryotes (last reviewed: (Antony et al, 2013;Sorokin, 2017;Sorokin et al, 2015;Sorokin et al, 2014), (Gracheva et al, 2017;Zavarzina et al, 2006;Zavarzina et al, 2020;Zhilina et al, 2015). Currently, a picture of trophic interactions in the haloalkaliphilic environments is fairly complete and the main actors and their trophic interactions are discovered.…”