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Humidity interaction of lichens under astrobiological aspects: the impact of UVC exposure on their water retention properties

Jänchen, J. and Meeßen, J. and Herzog, T.H. and Feist, M. and de la Torre, R. and de Vera, Jean Pierre Paul (2015) Humidity interaction of lichens under astrobiological aspects: the impact of UVC exposure on their water retention properties. International Journal of Astrobiology, pp. 1-12. Cambridge University Press. DOI: doi:10.1017/S147355041500004X ISSN 1473-5504

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Abstract

We quantitatively studied the hydration and dehydration behaviour of the three astrobiological model lichens Xanthoria elegans, Buellia frigida and Circinaria gyrosa by thermoanalysis and gravimetric isotherm measurements under close-to-Martian environmental conditions in terms of low temperature and low pressure. Additionally, the impact of UVC exposure on the isolated symbionts of B. frigida and X. elegans was studied by thermoanalysis and mass spectrometry as well as by gravimetric isotherm measurements. The thermal analysis revealed whewellite as a component of C. gyrosa which was not found in B. frigida and X. elegans. Neither the water retention nor the thermal behaviour of symbionts changed when irradiated with UVC under dry conditions. On the other hand, UVC irradiation of the wet mycobiont of B. frigida had a distinct impact on the hydration/dehydration ability which was not observed for the mycobiont of X. elegans. Possibly the melanin of B. frigida’s mycobiont, that is not present in X. elegans, or a specifically damaged acetamido group of the chitin of B. frigida may be the sources of additional UVCinduced sorption sites for water associated with the UVC exposure.

Item URL in elib:https://elib.dlr.de/95473/
Document Type:Article
Title:Humidity interaction of lichens under astrobiological aspects: the impact of UVC exposure on their water retention properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jänchen, J.TH Wildau, Technical University of Applied Sciences, Wildau, GermanyUNSPECIFIED
Meeßen, J.Institute of Botany, Heinrich-Heine-Universität, DüsseldorfUNSPECIFIED
Herzog, T.H.TH Wildau, Technical University of Applied Sciences, Wildau, GermanyUNSPECIFIED
Feist, M.Humboldt University Berlin, Institute of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, GermanyUNSPECIFIED
de la Torre, R.INTA MadridUNSPECIFIED
de Vera, Jean Pierre Pauljean-pierre.devera (at) dlr.deUNSPECIFIED
Date:8 January 2015
Journal or Publication Title:International Journal of Astrobiology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :doi:10.1017/S147355041500004X
Page Range:pp. 1-12
Publisher:Cambridge University Press
ISSN:1473-5504
Status:Published
Keywords:lichen, Mars, thermoanalysis, UVC irradiation, water sorption isotherms
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 > Experimentelle Planetenphysik
Deposited By: de Vera, Dr. Jean Pierre Paul
Deposited On:23 Mar 2015 14:44
Last Modified:31 Jul 2019 19:52

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