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Degradation of Biochemical Activity in Soil Sterilized by Dry Heat and Gamma RadiationThe effect of soil sterilization by dry heat (0.08% relative humidity), gamma radiation, or both on soil phosphatase, urease, and decarboxylase activity was studied. Soil sterilized by a long exposure to dry heat at relatively low temperatures (eight weeks at 100.5 C) retained higher activities than did soil exposed to a higher temperature (two weeks at 124.5 C), while all activity was destroyed by four days at 148.5 C. Sterilization with 7.5 Mrads destroyed less activity than did heat sterilization. The effect of several individually nonsterizing doses of heat radiation is described.
Document ID
19780069965
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shih, K. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Souza, K. A.
(NASA Ames Research Center Extraterrestrial Biology Div., Moffett Field, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1978
Publication Information
Publication: Origins of Life
Volume: 9
Subject Category
Space Biology
Accession Number
78A53874
Distribution Limits
Public
Copyright
Other

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