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Record Details

Record 96 of 1759
Mathematical estimation of the level of microbial contamination on spacecraft surfaces by volumetric air sampling
Author and Affiliation:
Oxborrow, G. S.
Roark, A. L.
Fields, N. D.
Puleo, J. R.(U.S. Public Health Service, Center for Disease Control, Cape Canaveral, Fla., Sandia Laboratories, Albuquerque)
Abstract: Microbiological sampling methods presently used for enumeration of microorganisms on spacecraft surfaces require contact with easily damaged components. Estimation of viable particles on surfaces using air sampling methods in conjunction with a mathematical model would be desirable. Parameters necessary for the mathematical model are the effect of angled surfaces on viable particle collection and the number of viable cells per viable particle. Deposition of viable particles on angled surfaces closely followed a cosine function, and the number of viable cells per viable particle was consistent with a Poisson distribution. Other parameters considered by the mathematical model included deposition rate and fractional removal per unit time. A close nonlinear correlation between volumetric air sampling and airborne fallout on surfaces was established with all fallout data points falling within the 95% confidence limits as determined by the mathematical model.
Publication Date: Apr 01, 1974
Document ID:
19740062566
(Acquired Dec 04, 1995)
Accession Number: 74A45316
Subject Category: BIOTECHNOLOGY
Document Type: Journal Article
Publication Information: Applied Microbiology; 27; Apr. 197
Publisher Information: United States
Contract/Grant/Task Num: NASA ORDER W-13062
Financial Sponsor: NASA; United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AIR SAMPLING; MATHEMATICAL MODELS; MICROORGANISMS; SOLID SURFACES; SPACECRAFT CONTAMINATION; VOLUMETRIC ANALYSIS; AIR FILTERS; CORRELATION; POISSON DENSITY FUNCTIONS; STATISTICAL ANALYSIS
Imprint And Other Notes: Applied Microbiology, vol. 27, Apr. 1974, p. 706-712.
Miscellaneous Notes: p. 706-712
Availability Source: Other Sources
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