Type of Document	Professional Paper
Author	Murray, Ryan M.
URN	etd-12202006-152114
Title	The Search For Volatile Biogenic Emissions In Geothermal Areas
Degree	Master of Science
Department	Chemistry
Advisory Committee	Advisor Name Title Dr. Garon C. Smith Committee Chair Dr. Christopher Palmer Committee Member Dr. Jesse V. Johnson Committee Member
Keywords	FTIR Fourier transform infrared spectroscopy biosignature organic acid carbon dioxide hot spring geothermal spring biomat
Date of Defense	2006-12-15
Availability	restricted
Abstract A primary discipline of astrobiology is the search for life outside of the earth’s ecosystem. Detecting biosignatures in outer space is one way this search is conducted. To understand the biosignatures to look for and study in space, it is useful to gain a better understanding of life in diverse environments on earth. This research tested the hypothesis that chemicals characteristic of microbial life can be detected and quantified in air above hot springs with Fourier transform infrared spectroscopy (FTIR). The stated hypothesis was refuted, as no chemicals of uniquely biological origin were detected with FTIR. A discussion of why no uniquely biological chemicals were detected with FTIR is presented. An analysis of chemicals seen in the infrared spectra, such as CO2, is given in the context of their possible biological origin. The results of the CO2 analysis indicate that the naturally occurring biomats are more complex than laboratory cultures and that the observable results of the behaviors of the two groups cannot be directly related. Lastly, other data collected (water chemistry and weather data for the springs) and the results of water analysis (ion chromatography and total organic carbon) are summarized. Acetate, propionate, and formate were present in some springs at low levels, indicating chemically the presence of microbial activity.
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