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Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
A modification of a gene that limits its expression to specified conditions or circumstances.
Medical Dictionary, © 2009 Farlex and Partners
knockdowna measure of biocide effect that is used when it is difficult to assess actual mortality. The measure is used particularly in biocide tests on insects, and has been shown to produce similar results to actual mortality scores. Knockdown is often measured as the inability to respond to a stimulus such as light or touch. see KNOCKDOWN LINE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005