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Ancient Hot Springs Reveal Secrets of Early Life

10/1/2025

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Summary

Story summary

Researchers from the Earth-Life Science Institute (Tokyo) studied five iron-rich hot springs in Japan to illuminate life during the Great Oxygenation Event.
The springs were oxygen-poor and near-neutral, modeling ancient Earth conditions.
Dominant microbes included microaerophilic iron-oxidizing bacteria, with cyanobacteria present in smaller numbers.
Study shows carbon and nitrogen cycling and a sulfur cycle despite low sulfur.

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Story summary

Researchers from the Earth-Life Science Institute (Tokyo) studied five iron-rich hot springs in Japan to illuminate life during the Great Oxygenation Event.
The springs were oxygen-poor and near-neutral, modeling ancient Earth conditions.
Dominant microbes included microaerophilic iron-oxidizing bacteria, with cyanobacteria present in smaller numbers.
Study shows carbon and nitrogen cycling and a sulfur cycle despite low sulfur.