Raman spectroscopic analysis of the calcium oxalate producing extremotolerant lichen Circinaria gyrosa

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dc.contributor.authorBöttger, Ute
dc.contributor.authorMeeßen, Joachim
dc.contributor.authorMartínez-Frías, Jesús
dc.contributor.authorHübers, Heinz-Wilhelm
dc.contributor.authorRull, Fernando
dc.contributor.authorSánchez, Francisco Javier
dc.contributor.authorTorre, R. de la
dc.contributor.authorVera, Jean Pierre Paul de
dc.date.accessioned2017-11-23T12:53:57Z
dc.date.available2017-11-23T12:53:57Z
dc.date.issued2013
dc.descriptionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.de
dc.descriptionThis publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.en
dc.description.abstractIn the context of astrobiological exposure and simulation experiments in the BIOMEX project, the lichen Circinaria gyrosa was investigated by Raman microspectroscopy. Owing to the symbiotic nature of lichens and their remarkable extremotolerance, C. gyrosa represents a valid model organism in recent and current astrobiological research. Biogenic compounds of C. gyrosa were studied that may serve as biomarkers in Raman assisted remote sensing missions, e.g. ExoMars. The surface as well as different internal layers of C. gyrosa have been characterized and data on the detectability and distribution of β-carotene, chitin and calcium oxalate monohydrate (whewellite) are presented in this study. Raman microspectroscopy was applied on natural samples and thin sections. Although calcium oxalates can also be formed by rare geological processes it may serve as a suitable biomarker for astrobiological investigations. In the model organism C. gyrosa, it forms extracellular crystalline deposits embedded in the intra-medullary space and its function is assumed to balance water uptake and gas exchange during the rare, moist to wet environmental periods that are physiologically favourable. This is a factor that was repeatedly demonstrated to be essential for extremotolerant lichens and other organisms. Depending on the decomposition processes of whewellite under extraterrestrial environmental conditions, it may not only serve as a biomarker of recent life, but also of past and fossilized organisms.en
dc.description.sponsorshipBMWi, 50WB1153, Analysen zur Stabilität und Degradation biogener Substanzen sowie zum Resistenzpotential der Fleche Buellia frigida unter simulierten Marsbedingungen und nach Exposition im LEO-Weltraumen
dc.identifier.eissn1475-3006
dc.identifier.issn1473-5504
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/7177
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6452
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc570 Biowissenschaften; Biologie
dc.subject.otherbiomarkeren
dc.subject.othercalcium oxalateen
dc.subject.otherCircinaria gyrosaen
dc.subject.otherRaman spectroscopyen
dc.titleRaman spectroscopic analysis of the calcium oxalate producing extremotolerant lichen Circinaria gyrosaen
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.doi10.1017/s1473550413000293
dcterms.bibliographicCitation.issue1
dcterms.bibliographicCitation.journaltitleInternational journal of astrobiology
dcterms.bibliographicCitation.originalpublishernameCambridge University Press
dcterms.bibliographicCitation.originalpublisherplaceCambridge
dcterms.bibliographicCitation.pageend27
dcterms.bibliographicCitation.pagestart19
dcterms.bibliographicCitation.volume13
tub.accessrights.dnbdomain
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Optik und Atomare Physik::FG Terahertztechnologiede
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Terahertztechnologiede
tub.affiliation.instituteInst. Optik und Atomare Physikde
tub.publisher.universityorinstitutionTechnische Universität Berlin

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