turnover number

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turn·o·ver num·ber (kcat),

the number of substrate molecules converted into product in an enzyme-catalyzed reaction under saturating conditions per unit time per unit quantity of enzyme; for example, kcat = Vmax/[Etotal].

turn·o·ver num·ber

(tŭrn'ō-vĕr nŭm'bĕr)
The number of substrate molecules converted into product in an enzyme-catalyzed reaction under saturating conditions per unit time per unit quantity of enzyme; e.g., kcat = Vmax/[Etotal].
References in periodicals archive ?
Both of these perspectives go beyond a consideration of the replacement costs of separations, which is the primary reason to reduce turnover frequency, and try to assess the costs (or benefits) associated with the performance differences between leavers, stayers, and replacements.
This study, consistent with previous research (Dalton et al., 1981) indicates that the traditional measure of turnover frequency overestimates the cost of turnover to organizations because it treats all separations as equally costly.
A belief that turnover frequency was inherently bad for an organization fueled research for many years.
Traditional relationships between job attitudes and turnover frequency do not necessarily hold across samples of high and low performers (Futrell and Parasuraman 1984; Johnston and Futrell 1989; Lucas, Babakus, and Ingram 1990).
Age, education, and job tenure have been related to turnover frequency; however, the focus of this study is not frequency but functionality (dysfunctional turnover).