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Phosphorus is central to the functioning of
ecosystems as well as many strategies aiming at a sustainable management of
environmental resources. Microorganisms
have been shown to be major actors
in modern and past geochemical cycles of P either as reservoirs and/or
catalysts of processes exchanging P between different reservoirs. Over
the last years, we have been developing several lines of research about
1) characterization of P species at the nanoscale, 2) polyphosphate
formation, 3) biomineralization and fossilization of microbial cells by
phosphate minerals
Characterization of P species at the nanoscale
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Charaterization of P species by scanning transmission x-ray microscopy (STXM):
- identification of P mineral through Ca and P speciation (Ca & P L2,3 edges)
- Quantification of carbonate substitution (C K-edge)
Benzerara et al (2004) Geobiology
Cosmidis et al (2015) Acta Biomaterialia
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Geochimical impact of polyphosphate and Fe-phosphate formation
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Role and mechanisms of Fe-phosphate biomineralization in Lake Pavin
Cosmidis et al (2014) Geochim. Cosmochim Acta
Busigny et al (2016) Book chapter
Massive formation of polyphosphate by some magnetotactic bacteria in Lake Pavin
Rivas-Lamelo et al (2017) Geochemical Perspective
Letters
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Biomolecular mechanisms of calcification
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Kinetics and localization of calcification by E. coli mutants surexpressing alkaline phosphatase phoA
Cosmidis et al (2015) Frontiers in Earth Science
In silico and in vitro analysis of diverse phosphatases involved in calcification
Skouri-Panet et al (2018) Frontiers in Microbiology
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Fossilization of bacterial cells by calcification
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FIB/TEM/STXM characterization of bacterial fossils in phosphorites/coprolites...
Cosmidis et al (20013) Chemical Geology
Cosmidis et al (2013) Geobiology
Zaton et al (2015) Palaeogeography,
Paleoclimatology, Palaeoecology
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Medical calcifications
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Nanoscale characterization of so-called nanobacteria/microcalcifications
Benzerara et al (2006) Journal of Investigative Medicine
Bacterial involvement in the formation of some kidney stones
Marine Livrozet's PhD
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