Rideal-Walker coefficient
- Rideal-Walker coefficient
The Rideal-Walker coefficient is a figure expressing the disinfecting power of any substance and is obtained by dividing the figure indicating the degree of dilution of the disinfectant that kills a microorganism in a given time by that indicating the degree of dilution of phenol that kills the organism in the same space of time under similar conditions. Although very similar to the phenol coefficient, the Rideal-Walker coefficient determines the phenol coefficient utilizing the method (test) developed by English chemists Samuel Rideal, (1863–1929) and J.T. Ainslie Walker, (1868–1930).
References
* [http://www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_r_13zPzhtm Rideal-Walker coefficient definition.] Retrieved Nov. 6, 2006.
* [http://medical-dictionary.thefreedictionary.com/Rideal-Walker+coefficient Rideal-Walker coefficient.] Retrieved Nov. 6, 2006.
ee also
*Phenol coefficient
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Rideal-Walker coefficient method (test) — Rid·e·al Walk·er coefficient, method (test) (ridґe əl wawkґər) [Samuel Rideal, English chemist, 1863–1929; J.T. Ainslie Walker, English chemist, 1868–1930] see phenol coefficient, under coefficient, and see under method … Medical dictionary
Rideal-Walker coefficient — see phenol c … Medical dictionary
Rideal-Walker test — Ri·de·al Walk·er test ri dē(ə)l wȯ kər n a test for determining the phenol coefficient esp. of a disinfectant Rideal Samuel (1863 1929), and Walker J. T. Ainslie (1868 1930) British chemists. Rideal taught chemistry and was an expert on the… … Medical dictionary
rideal-walker test — rə̇ˈdē(ə)lˈwȯkə(r) noun Usage: usually capitalized R&W Etymology: after Samuel Rideal died 1929 & J.T.A.Walker English chemists : a test for determining the phenol coefficient especially of a disinfectant … Useful english dictionary
Rideal-Walker method — a method for calculating the phenol coefficient of a disinfectant; cultures of Salmonella enterica subsp. enterica serovar Typhi are incubated with serial dilutions of the test compound, with dilutions of phenol as standards. Samples are removed… … Medical dictionary
coefficient — 1. The expression of the amount or degree of any quality possessed by a substance, or of the degree of physical or chemical change normally occurring in that substance under stated conditions. 2. The ratio or factor that relates a quantity… … Medical dictionary
Walker — Arthur Earl, U.S. neurologist, *1907. See W. tractotomy, Dandy W. syndrome. J.T. Ainslie, English chemist, 1868–1930. See Rideal W. coefficient, Rideal W. method. James, British gynecologist, *1916. See W. chart. * * * walk·er wȯ kər n a… … Medical dictionary
Rideal — Samuel, English chemist and bacteriologist, 1863–1929. See R. Walker coefficient, R. Walker method … Medical dictionary
Phenol coefficient — is a measure of the bactericidal activity of a chemical compound in relation to phenol. When listed numerically, the figure expressing the disinfecting power of a substance by relating it to the disinfecting power of phenol may be a function of… … Wikipedia
phenol coefficient — n a number relating the germicidal efficiency of a compound to phenol regarded as having an arbitrarily assigned value of 1 toward specified bacteria (as typhoid bacteria) under specified conditions * * * a measure of the bactericidal activity of … Medical dictionary