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Cave bacteria-induced amorphous calcium carbonate formation.
Enyedi, Nóra Tünde; Makk, Judit; Kótai, László; Berényi, Bernadett; Klébert, Szilvia; Sebestyén, Zoltán; Molnár, Zsombor; Borsodi, Andrea K; Leél-Ossy, Szabolcs; Demény, Attila; Németh, Péter.
Afiliação
  • Enyedi NT; Department of Microbiology, Faculty of Science, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117, Budapest, Hungary.
  • Makk J; Department of Microbiology, Faculty of Science, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117, Budapest, Hungary.
  • Kótai L; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary.
  • Berényi B; Deuton-X Ltd., Selmeci u. 89, H-2030, Érd, Hungary.
  • Klébert S; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary.
  • Sebestyén Z; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary.
  • Molnár Z; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary.
  • Borsodi AK; Department of Earth and Environmental Sciences, University of Pannonia, Egyetem út 10, H-8200, Veszprém, Hungary.
  • Leél-Ossy S; Department of Microbiology, Faculty of Science, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117, Budapest, Hungary.
  • Demény A; Department of Physical and Applied Geology, Faculty of Science, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117, Budapest, Hungary.
  • Németh P; Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Budaörsi út 45, H-1112, Budapest, Hungary.
Sci Rep ; 10(1): 8696, 2020 05 26.
Article em En | MEDLINE | ID: mdl-32457467
Amorphous calcium carbonate (ACC) is a precursor of crystalline calcium carbonates that plays a key role in biomineralization and polymorph evolution. Here, we show that several bacterial strains isolated from a Hungarian cave produce ACC and their extracellular polymeric substance (EPS) shields ACC from crystallization. The findings demonstrate that bacteria-produced ACC forms in water-rich environment at room temperature and is stable for at least half year, which is in contrast to laboratory-produced ACC that needs to be stored in a desiccator and kept below 10 °C for avoiding crystallization. The ACC-shielding EPS consists of lipids, proteins, carbohydrates and nucleic acids. In particular, we identified large amount of long-chain fatty acid components. We suggest that ACC could be enclosed in a micella-like formula within the EPS that inhibits water infiltration. As the bacterial cells lyse, the covering protective layer disintegrates, water penetrates and the unprotected ACC grains crystallize to calcite. Our study indicates that bacteria are capable of producing ACC, and we estimate its quantity in comparison to calcite presumably varies up to 20% depending on the age of the colony. Since diverse bacterial communities colonize the surface of cave sediments in temperate zone, we presume that ACC is common in these caves and its occurrence is directly linked to bacterial activity and influences the geochemical signals recorded in speleothems.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Bactérias / Carbonato de Cálcio Tipo de estudo: Prognostic_studies Idioma: En Revista: Sci Rep Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Bactérias / Carbonato de Cálcio Tipo de estudo: Prognostic_studies Idioma: En Revista: Sci Rep Ano de publicação: 2020 Tipo de documento: Article