JMDMT #51 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection -pres- sures below 10~ mm. of Hg. (Portner et al., 1961). Table 1 Environmental Limits of Temperature, Eh (at the Prevailing pH), pH, Hydrostatic Pressure, and Salinity for Growth and Reproduction OF Microorganisms Factor Lower limit Upper limit Temperature -18° C. (fungi, bacteria) 104° C. (sulfate reducing bacteria under 1000 atmos. hydrostatic pressure) Eh -450 mv. at pH 9.5 (sulfate re- ducing bacteria) 4-850 mv. at pH 3 (iron bacteria) pH {Acontium velatum, fungus D, Tbiobacillus iliiooxidans) 13 (?) (Plectonema nostocorum) Hydrostatic pres- Essentially 1400 Atmos. (deep sea and bac- sure teria) Salinity Double distilled water (heterotro- Saturated brines {Dunaliella, halo- phic bacteria) philic bacteria, etc.) (8) Survival of many microorganisms after prolonged exposure to