Examinando por Autor "Escudero, C."

Mostrando 1 - 3 de 3

Acceso Abierto
Dark microbiome and extremely low organics in Atacama fossil delta unveil Mars life detection limits
(Nature Publishing Group, 2023-02-21) Azua Bustos, A.; Fairén, A.; González Silva, C.; Prieto Ballesteros, O.; Carrizo, D.; Sánchez García, L.; Parro García, V.; Fernández Martínez, M. A.; Escudero, C.; Muñoz Iglesias, V.; Fernández Sampedro, M.; Molina, A.; García Villadangos, M.; Moreno Paz, M.; Wierzchos, J.; Ascaso, C.; Fornado, Teresa; Brucato, J. R.; Poggiali, G.; Manrique, J. A.; Veneranda, M.; López Reyes, G.; Sanz Arranz, A.; Rull, F.; Ollila, A. M.; Wiens, R. C.; Reyes Newell, Adriana; Clegg, S. M.; Millan, Maëva; Stewart Johnson, Sarah; McIntosh, Ophélie; Szopa, Cyril; Freissinet, Caroline; Sekine, Yasuhito; Fukushi, Keisuke; Morida, Koki; Inoue, Kosuke; Sakuma, Hiroshi; Rampe, E.; European Commission (EC); Ministerio de Economía y Competitividad (MINECO); Japan Society for the Promotion of Science (JSPS); Comunidad de Madrid; National Aeronautics and Space Administration (NASA); Agenzia Spaziale Italiana (ASI); Agencia Estatal de Investigación (AEI); Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
Identifying unequivocal signs of life on Mars is one of the most important objectives for sending missions to the red planet. Here we report Red Stone, a 163-100 My alluvial fan–fan delta that formed under arid conditions in the Atacama Desert, rich in hematite and mudstones containing clays such as vermiculite and smectites, and therefore geologically analogous to Mars. We show that Red Stone samples display an important number of microorganisms with an unusual high rate of phylogenetic indeterminacy, what we refer to as “dark microbiome”, and a mix of biosignatures from extant and ancient microorganisms that can be barely detected with state-of-the-art laboratory equipment. Our analyses by testbed instruments that are on or will be sent to Mars unveil that although the mineralogy of Red Stone matches that detected by ground-based instruments on the red planet, similarly low levels of organics will be hard, if not impossible to detect in Martian rocks depending on the instrument and technique used. Our results stress the importance in returning samples to Earth for conclusively addressing whether life ever existed on Mars.
Acceso Abierto
Draft Genome Sequence of Pseudomonas sp. Strain T2.31D-1, Isolated from a Drilling Core Sample Obtained 414 Meters below Surface in the Iberian Pyrite Belt
(American Society for Microbiology, 2021-01-07) Martínez, J. M.; Escudero, C.; Leandro, T.; Mateos, G.; Amils, R.; Ministerio de Ciencia e Innovación (MICINN); 0000-0003-3954-2985; 0000-0003-1240-4144; 0000-0002-7560-1033
We report the draft genome of Pseudomonas sp. strain T2.31D-1, which was isolated from a drilling core sample obtained 414 m below surface in the Iberian Pyrite Belt. The genome consists of a 4.7-Mb chromosome with 4,428 coding sequences, 1 rRNA operon, 59 tRNA genes, and a 31.8-kb plasmid.
Restringido
Subsurface and surface halophile communities of the chaotropic Salar de Uyuni
(Society for Applied Microbiology, 2021-01-28) Martínez, J. M.; Escudero, C.; Rodíguez, N.; Rubin, S.; Amils, R.; Ministerio de Economía y Competitividad (MINECO); 0000-0003-3954-2985; 0000-0002-3387-7760; 0000-0002-7560-1033; 0000-0003-1240-4144; 0000-0003-4109-4851
Salar de Uyuni (SdU) is the biggest athalosaline environment on Earth, holding a high percentage of the known world Li reserves. Due to its hypersalinity, temperature and humidity fluctuations, high exposure to UV radiation, and its elevated concentration of chaotropic agents like MgCl2, LiCl and NaBr, SdU is considered a polyextreme environment. Here, we report the prokaryotic abundance and diversity of 46 samples obtained in different seasons and geographical areas. The identified bacterial community was found to be more heterogeneous than the archaeal community, with both communities varying geographically. A seasonal difference has been detected for archaea. Salinibacter, Halonotius and Halorubrum were the most abundant genera in Salar de Uyuni. Different unclassified archaea were also detected. In addition, the diversity of two subsurface samples obtained at 20 and 80 m depth was evaluated and compared with the surface data, generating an evolutionary record of a multilayer hypersaline ecosystem.