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Project environmental microbiology as related to planetary quarantineMicrobiological analyses of soil particles allow for the following conclusions: (1) there is a considerable range in the values of aerobic, mesophilic microbial counts associated with different size soil fractions; (2) as soil particle size increases, there is an increase in the mean microbial concentration per particle; (3) plate counts of aerobic, mesophilic organisms in unheated soils yielded a mean concentration of about six organisms per particle for the smallest soil fraction; (4) aerobic, mesophilic counts for sonicated particles heated at 80 C for 20 minutes yielded mean values of about two organisms per particle for the smallest particles; (5) some actinomycetes associated with the soil fractions could survive dry heat treatment at 110 C for one hour; and (6) soil particles stored under ambient laboratory conditions for 2.5 years aerobic, mesophilic plate counts which were comparable or slightly greater than the counts for more recently collected soil.
Document ID
19740025462
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Pflug, I. J. (Minnesota Univ. Minneapolis, MN, United States)
Date Acquired
September 3, 2013
Publication Date
May 29, 1974
Subject Category
Biosciences
Report/Patent Number
SAPR-12
NASA-CR-140447
Accession Number
74N33575
Funding Number(s)
CONTRACT_GRANT: NGL-24-005-160
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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