期刊
ASTROBIOLOGY
卷 9, 期 7, 页码 659-672出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/ast.2009.0351
关键词
Cryosphere; Ice; Mars; Photosynthesis; Psychrophiles
资金
- Tawani Foundation
- Austrian Ministry of Science and Research
- Kinohi Institute
- Austrian Academy of Sciences
- Planetary Studies Foundation
- Tyrolean Science Fund
Laser-induced fluorescence emission (L.I.F.E.) images were obtained in situ following 532 nm excitation of cryoconite assemblages in the ice covers of annual and perennially frozen Antarctic lakes during the 2008 Tawani International Expedition to Schirmacher Oasis and Lake Untersee in Dronning Maud Land, Antarctica. Laser targeting of a single millimeter-scale cryoconite results in multiple neighboring excitation events secondary to ice/air interface reflection and refraction in the bubbles surrounding the primary target. Laser excitation at 532 nm of cyanobacteria-dominated assemblages produced red and infrared autofluorescence activity attributed to the presence of phycoerythrin photosynthetic pigments. The method avoids destruction of individual target organisms and does not require the disruption of either the structure of the microbial community or the surrounding ice matrix. L. I. F. E. survey strategies described may be of interest for orbital monitoring of photosynthetic primary productivity in polar and alpine glaciers, ice sheets, snow, and lake ice of Earth's cryosphere. The findings open up the possibility of searching from either a rover or from orbit for signs of life in the polar regions of Mars and the frozen regions of exoplanets in neighboring star systems.
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