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Related Experiment Videos

Limits of microbial existence: temperature and pH.

T D Brock, G K Darland

    Science (New York, N.Y.)
    |September 25, 1970
    PubMed
    Summary

    Bacteria thrive in neutral to alkaline hot springs up to boiling point. However, acidic conditions significantly lower the temperature limit for bacterial survival, indicating environmental limits for life.

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    Area of Science:

    • Microbiology
    • Extremophile Research
    • Geochemistry

    Background:

    • Hot springs harbor diverse microbial life adapted to extreme conditions.
    • Understanding the interplay between temperature and pH is crucial for defining life's limits.

    Purpose of the Study:

    • To investigate the upper temperature limits of bacterial life in hot springs across a range of pH values.
    • To determine if bacteria can simultaneously adapt to high temperatures and high acidity.

    Main Methods:

    • Microscopic surveys were conducted in hot springs with varying temperatures and pH levels.
    • Bacterial presence was correlated with specific environmental parameters (temperature and pH).

    Main Results:

    • Bacteria were detected up to the boiling point (92-100°C) in neutral to alkaline hot springs.
    • In acidic hot springs (pH 2-3), the upper temperature limit for bacteria decreased to 75-80°C.
    • Bacteria evolved the capacity for high-temperature or high-acidity tolerance, but not both.

    Conclusions:

    • Life in hot springs is constrained by combined high-temperature and high-acidity conditions.
    • Physicochemical environmental limits exist beyond which life cannot persist.

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