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Provision of water by halite deliquescence for Nostoc commune biofilms under Mars relevant surface conditions

Jänchen, J. and Feyh, N. and Szewzyk, U. and de Vera, Jean Pierre Paul (2015) Provision of water by halite deliquescence for Nostoc commune biofilms under Mars relevant surface conditions. International Journal of Astrobiology. Cambridge University Press. DOI: 10.1017/S147355041500018X ISSN 1473-5504

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Abstract

Motivated by findings of new mineral related water sources for organisms under extremely dry conditions on Earth we studied in an interdisciplinary approach the water sorption behaviour of halite, soil component and terrestrial Nostoc commune biofilm under Mars relevant environmental conditions. Physicochemical methods served for the determination of water sorption equilibrium data and survival of heterotrophic bacteria in biofilm samples with different water contents was assured by recultivation. Deliquescence of halite provides liquid water at temperatures <273 K and may serve as water source on Mars during themorning stabilized by the CO2 atmosphere for a few hours. The protecting biofilmof N. commune is rather hygroscopic and tends to store water at lower humidity values. Survival tests showed that a large proportion of the Alphaproteobacteria dominated microbiota associated to N. commune is very desiccation tolerant and water uptake from saturated NaCl solutions (either by direct uptake of brine or adsorption of humidity) did not enhance recultivability in long-time desiccated samples. Still, a minor part can grow under highly saline conditions.However, the salinity level, although unfavourable for the host organism, might be for parts of the heterotrophic microbiota no serious hindrance for growing in salty Mars-like environments.

Item URL in elib:https://elib.dlr.de/98844/
Document Type:Article
Title:Provision of water by halite deliquescence for Nostoc commune biofilms under Mars relevant surface conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jänchen, J.TH Wildau, Technical University of Applied Sciences, Wildau, GermanyUNSPECIFIED
Feyh, N.Institut für Umwelttechnologie, TU BerlinUNSPECIFIED
Szewzyk, U.Institut für Umwelttechnologie, TU BerlinUNSPECIFIED
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deUNSPECIFIED
Date:3 August 2015
Journal or Publication Title:International Journal of Astrobiology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1017/S147355041500018X
Publisher:Cambridge University Press
ISSN:1473-5504
Status:Published
Keywords:geochemistry; halite; Mars, mineralogy; Nostoc commune; smectite; surface; water sorption
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: de Vera, Dr. Jean Pierre Paul
Deposited On:17 Nov 2015 13:54
Last Modified:01 Dec 2018 19:51

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