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

By Frederick I. Ordway (ed.)

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Extra resources for Advances in Space Science and Technology 9

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Chemical stress also exists. Salt lakes often reach 23 per cent salinity or more, yet harbor crustaceans, insects, larvae, and protozoa, algae, and bacteria. Even toxic gases such as H 2 S can only limit, but not eliminate, life [11,15]. 3 . MlCROHABITATS At a time when planetary conditions and closed systems are receiving a great deal of attention, it is important that the concept of microen vironment not be overlooked. In a sense, the cave and subterranean habitats mentioned above illustrate a microenvironmental complex.

The important factors can then be combined as desired. By these procedures, organisms can be put under conditions of stress enclosing the factorial elements of any specific environment, and biological performance and trends can be established. B. Scope of Conditions 1. TERRESTRIAL CONDITIONS The conditions of existence on Earth have already been considered. From preceding comments and discussion it should be apparent that environmental simulation and stress experimentation have numerous terrestrial applications at several environmental levels.

It does not follow, of course, that it will be available in a bulk liquid form. It is difficult to picture life evolving without liquid water—and even more difficult to picture life without some substitute liquid. Many have been suggested, from N H 3 to S 0 2 and HF. Possibly, with the exception of liquid ammonia, we might well be hard pressed to recognize life in other nonaqueous liquids, and the writer finds it difficult to formulate even a very hypothetical nonliquid life-form. We still, therefore, restrict these considerations to the water and aqueous systems while assuming that an ammoniacal system might well keep pace with any principles enunciated.

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