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JMDMT #42 Microfossils of Cyanobacteria in Carbonaceous Meteorites

The James M. DuPont Meteorite Collection - According to Gibbons and Payne (1961) the most rapid growth rates of several halophilic bacteria (Halobacterium spp. and Sarcina littoralis) occur in solutions containing 20 to 25 per cent NaCl at temperatures in the range of 40° to 45° C. ZoBell (1958) states that sulfate reducing bacteria grow naturally and can be cultured in waters with salinities up to 300 per thousand. Pressure The effect of varying atmospheric pressure on the growth and reproduction of microorganisms seems not to have been investigated in much detail. Strug- hold (1961), however, passingly refers to the cultivation of soil bacteria under an atmosphere with the composition and total pressure (0.1 Earth atmos.) of that presumed to exist on Mars. The existence of barophilic bacteria in sub- terranean deposits and

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