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The limits for life under multiple extremes.

Jesse P Harrison1, Nicolas Gheeraert, Dmitry Tsigelnitskiy

  • 1UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK. j.p.harrison@ed.ac.uk

Trends in Microbiology
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Summary
This summary is machine-generated.

Microbial life faces limits from extreme temperature, pH, salt, and pressure. More research is needed on how microbes tolerate these combined extremes, impacting astrobiology and industrial microbiology.

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Area of Science:

  • Microbiology
  • Astrobiology
  • Environmental Science

Background:

  • Life on Earth exists within defined physical and chemical parameters, known as habitable space.
  • While liquid water is a known requirement, specific limits for life under extreme conditions remain largely undefined.
  • Understanding these limits is crucial for various scientific disciplines.

Purpose of the Study:

  • To investigate the limitations for microbial life under combined environmental extremes.
  • To analyze the tolerance of prokaryotic strains to simultaneous variations in temperature, pH, salinity, and pressure.
  • To identify knowledge gaps regarding microbial life under multiple stressors.

Main Methods:

  • Utilized published growth data from 67 diverse prokaryotic strains.
  • Analyzed data focusing on responses to combined extremes of temperature, pH, salt (NaCl) concentrations, and pressure.
  • Conducted a comprehensive literature review to assess existing information.

Main Results:

  • A significant lack of data exists on microbial tolerance to multiple simultaneous environmental extremes.
  • Current understanding is insufficient to define precise boundaries for life under combined stressors.
  • The study highlights a critical gap in knowledge across various scientific fields.

Conclusions:

  • Further research is essential to establish the limits of microbial life under combined extreme conditions.
  • This knowledge gap hinders progress in environmental and industrial microbiology, as well as the search for extraterrestrial life.
  • Defining these boundaries will refine our understanding of habitability on Earth and beyond.