New estimate reduces the number of microbes on Earth by around half.
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References
Kallmeyer, J., Pockalny, R., Adhikari, R., Smith, D. & D'Hondt, S. PNAS http://dx.doi.org/10.1073/pnas.1203849109 (2012).
Whitman, W., Coleman, D. & Wiebe, W. PNAS USA 95 6578-6583 (1998).
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Lougheed, K. There are fewer microbes out there than you think. Nature (2012). https://doi.org/10.1038/nature.2012.11275
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DOI: https://doi.org/10.1038/nature.2012.11275