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Thermal Limits To Life On Earth: A Comparison Across Domains.pdf

Clarke.pdf
Preview of Thermal Limits to Life on Earth: A Comparison Across Domains
🔗 Source: web.archive.org
📊 Size: 335 KB
📄 Pages: 14 pages
⬇️ Downloads: 30

Summary

The article by Andrew Clarke discusses the thermal limits to life on Earth, focusing on how temperature affects essential biological processes and the survival of different organisms. Key points include:

- Three Essential Features of Life: DNA (software), proteins and macromolecules providing structural support (hardware), and energy flux.
- Impact of Temperature: Temperature profoundly influences all aspects of life, affecting water viscosity, pH, gas solubility, etc., making controlled experiments challenging.
- Thermal Limits for Different Organism Domains:
- Bacteria: Can grow up to 100 °C, but no known completion of the life cycle above 60 °C.
- Archaea: Current high-temperature limit for growth is 122 °C.
- Eukaryotes (unicellular and multicellular): Lower thermal limits for growth and completion of the life cycle, with a general lower limit around −2 °C.
- Lichens and Higher Plants: Lichens can grow down to −10 °C, while higher plants and invertebrates living at high latitudes can survive down to −70 °C.
- Astrobiological Implications: Understanding Earth's thermal limits aids in the search for life elsewhere, particularly on exoplanets with liquid water. The presence of temperature extremes highlights both challenges and opportunities in astrobiology research.

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Description

Earth's life forms require DNA (software), physical structures (hardware), and energy flux, with reproduction driving evolution. Temperature profoundly impacts these factors, yet life persists in diverse conditions, making it challenging to define precise thermal limits for completing life cycles, especially in variable environments.

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  • File Format: PDF
  • File Size: 335 KB
  • Pages: 14
  • Language: EN
  • Total Downloads: 30
  • Last Updated: 3 weeks ago

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As of August 2016, there are around 3,400 confirmed exoplanets in 2,617 systems, with 590 systems having multiple planets.
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