It is important to understand how microbiological contamination occurs, and how materials become nonsterile in the creation of clean rooms. Various agencies, notably the National Aeronautics and Space Administration (NASA) (Hall, 1965; NASA, 1968; Hall and Lyle, 1971), have interested themselves in microbiological contamination and in developing models for how it arises. This has increased in importance when the potential contamination of other planets with life-forms originating from earth is considered.
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