knockdown

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The alteration of a gene’s function so that it is conditionally expressed, a manoeuvre required when complete gene knockout would be lethal to the organism

knockdown

A modification of a gene that limits its expression to specified conditions or circumstances.

knockdown

a 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.
References in periodicals archive ?
In 1906, Pioneer Boat and Pattern Company emerged out of the Modern firm and took over Modern's Birney Street factory, becoming one of the larger manufacturers of knock-down boats.
One knock-down boat startup, incorporated in 1905, would launch a Bay City industrial giant.
While most of the area's knock-down boat companies were local, one came from out of state; the Valley Boat & Engine Company of Baldwinsville, New York was persuaded by the Saginaw Merchant and Manufacturers Association to relocate to their community in late 1909.
Healy picked up another Viljanen knock-down before unleashing a 25-yard screamer that flew into the top corner.
In a successful result for the event riders, Polly Phillips and Coral Coves who won the Braham three-day event last month, were runners-up after adding on 15 seconds for three knock-downs and New Zealand's Blyth Tait and Ready Teddy were third.