Crystalline water in gypsum is unavailable for cyanobacteria in laboratory experiments and in natural desert endolithic habitats
| Autor: | Petr Vítek, Fernando Garcia, Armando Azua-Bustos, Alberto G. Fairén, Jacek Wierzchos, Octavio Artieda, Carmen Ascaso |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Ministry of Education, Youth and Sports (Czech Republic), Universidad de Santiago de Compostela, Nieto García, F. [0000-0001-6250-056X], Wierzchos, J. [0000-0003-3084-3837], Azua Bustos, A. [0000-0002-6590-4145], European Commission (EC), Czech Republic Government, MCIU/AEI (Spain), ERC-CoG, Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737, European Research Council (ERC), Agencia Estatal de Investigación (AEI) |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Cyanobacteria Gypsum 030106 microbiology Mineralogy engineering.material Calcium Sulfate 03 medical and health sciences chemistry.chemical_compound Mineral identification Letters Fourier transform infrared spectroscopy Sulfate Ecosystem Multidisciplinary Anhydrite biology Water Water extraction biology.organism_classification 030104 developmental biology chemistry engineering Selected area diffraction Laboratories |
| Zdroj: | Proc Natl Acad Sci U S A Proceedings of the National Academy of Sciences Digital.CSIC. Repositorio Institucional del CSIC instname DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial Instituto Nacional de Técnica Aeroespacial (INTA) |
| Popis: | Huang et al. (1) describe a supposed mechanism of water extraction from gypsum by cyanobacteria sampled from endoliths inhabiting Ca sulfates in the Atacama Desert, and cultivated in the laboratory. The authors claim that the phase transformation from gypsum (CaSO4·2H2O) to anhydrite (CaSO4) (G→A) occurred under “dry conditions” in the contact zone between a “dry biofilm” and the gypsum, where only {011} planes of gypsum are transformed to anhydrite, supposedly providing water for cyanobacteria. This work (1) has a number of major conceptual problems, as follows. First, the authors show the presence of gypsum and/or anhydrite in the inoculated Ca sulfate samples using X-ray diffraction and, incompletely, by Fourier transform infrared spectroscopy techniques (2), and not by Raman (3) or transmission electron microscopy. Selected area electron diffraction (SAED) data in ref. 1 do not allow any mineral identification, due to their differences with … [↵][1]1To whom correspondence may be addressed. Email: j.wierzchos{at}mncn.csic.es or oartieda{at}unex.es. [1]: #xref-corresp-1-1 |
| Databáze: | OpenAIRE |
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