Tuesday, December 28, 2004


(from the Greek meaning �known life�), condition of life in which only known kinds of organisms are present. Gnotobiotic organisms are of two major types: germfree, that is, free of all known contaminants; and gnotophoric, bearing a single known contaminant, usually administered as part of an experiment. The term �germfree,� however, is often used loosely to indicate all organisms


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