By Frederick I. Ordway (ed.)
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M. SIEGEL evolutionary groupings, branchings, and origins is great. To a large extent it is vindicated by immunochemical tests which suggest that the essentially visual judgment of naturalists and systematists over the past 200 years is almost fully consonant with the specific protein chemistry of cells in different forms. From such a selection, it is possible to gain some notion about the general tolerance toward experimental factors of plants, animals, and microorganisms. The "profile" of such a collection is likely to be more important than individual species, unless some truly outstanding capabilities are discovered.
In all other situations, the amplitude of temperature variation can be as wide as may be desired or needed as long as it passes through a sufficiently prolonged liquid phase during its oscillations. If a liquid other than H 2 0 is used as a reference point, the amplitude will reflect this. Examples would be liquid N H 3 or H 2 0 saturated with CaCl 2 . c. Minimum, Optimum, Maximum Although it might have been discussed under "atmosphere," the "Law of the Optimum" and its attendant concepts is most distinctive in relation to temperature.
As a tentative explanation, we believe that the stress factors which select those members of a population for a particular environment do not select for resistance to that environment, but for resistance to stress itself. Thus, a plant selected for relatively high, dry conditions may in fact be selected for its ability to correct or compensate for adverse conditions. 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.
Advances in Space Science and Technology 9 by Frederick I. Ordway (ed.)