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In situ microbial detection in Mojave Desert soil using native fluorescence.

H D Smith1, A G Duncan, P L Neary

  • 1Department of Biological Engineering, Utah State University, Logan, 84322, USA. hdsmith@aggiemail.usu.edu

Astrobiology
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Summary
This summary is machine-generated.

Portable fluorescence instrument detects microbes in desert soil, showing promise for Mars missions. This technology can map microbial concentrations in extreme environments, aiding astrobiology research.

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Area of Science:

  • Astrobiology
  • Environmental Science
  • Microbiology

Background:

  • Assessing microbial life in extreme environments is crucial for understanding life's potential beyond Earth.
  • Developing portable, non-contact detection methods is essential for planetary exploration.

Purpose of the Study:

  • To evaluate a portable fluorescence instrument for detecting and quantifying soil microbes in the Mojave Desert.
  • To assess the instrument's suitability for microbial detection on future Mars missions.

Main Methods:

  • Utilized a portable fluorescence instrument with four excitation and four emission wavelengths.
  • Calibrated instrument sensitivity using a dilution series of Bacillus subtilis spores in soil.
  • Employed phospholipid fatty acid analysis for independent microbial quantification.

Main Results:

  • Observed that biological and organic soil components exhibit strong native fluorescence, comparable to mineral fluorescence.
  • Estimated microbial content at the primary site as 10(7) bacteria per gram of soil.
  • Mapped microbial concentrations ranging from 10(4) to 10(7) cells per gram across a 50m area.

Conclusions:

  • Native fluorescence is a viable method for non-contact microbial detection in extreme terrestrial environments.
  • The portable instrument shows significant potential for in situ microbial analysis on Mars missions.
  • This technology can aid in understanding microbial distribution and abundance in extraterrestrial soils.