Summary
Field observations of the natural habitats, the temperature maximum for 14CO2 incorporation of natural populations, and the temperature maximum for the growth of cultures of Cyanidium caldarium indicate that the upper temperature limit for C. caldarium is 55–60°C. These results are not compatible with the description of C. caldarium as an extreme thermophile.
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Doemel, W.N., Brock, T.D. The upper temperature limit of Cyanidium caldarium . Archiv. Mikrobiol. 72, 326–332 (1970). https://doi.org/10.1007/BF00409031
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DOI: https://doi.org/10.1007/BF00409031