Advances in Space Science and Technology 9 by Frederick I. Ordway (ed.)

By Frederick I. Ordway (ed.)

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In work with ultraviolet, other factors must be taken into account, particularly the atmosphere [27]. One possible atmospheric model for Mars simulation tests with ultraviolet is C 0 2 13 per cent, Ar 35 per cent, N 2 52 per cent by volume at 20 mb pressure [28]. A suitable model, for all practical purposes equivalent to the above, is simply N 2 at normal atmospheric pressure. A second factor of especial importance for microorganisms is the salt content of their liquid medium. If halide-rich brine cultures are used, only a few centimeters of depth will suffice to screen out the ultraviolet radiation [29].

P. P. of medium/system fDiurnal < Seasonal (annual) lOther Recurrent Noncurrent Thermostability of medium biosystem None a. Time In large measures, the use of constant temperatures is a product of the laboratory. It finds some justification in homeothermic animal systems which sustain a constant temperature environment for their cellular chemical processes. No other justification save convenience actually exists for the use of constant ambient temperature even with birds and mammals. Plant physiologists have long used alternating temperatures, at first in seed germination research and later in over-all plant growth and development studies.

Again, we use winter rye as an illustration ; this plant cannot only grow under water, but also in salt solutions, in heavy water, in the absence of molecular oxygen, and on diurnal temperature cycles combining a 20°C 12-hr day with a - 2 0 ° C 12-hr night. In using the niche concept, therefore, it must be borne in mind that an organism may be simultaneously adapted (potentially) to more environments than are in evidence in nature at any one time. I I I . Elements of Basic Bio-Stress Experimentation Seek simplicity then distrust it—Whitehead A.

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