| 单词 | lf |
| 释义 | > as lemmasL.F. L.F. n. low frequency. Π 1922 Wireless World 18 Nov. 233 (heading) The switching of L.F. valves. 1923 Wireless World 6 Jan. 463/1 Methods of intervalve coupling, namely, ‘high frequency transformer’,..and ‘low frequency transformer’..‘H.F. transformer’ and ‘L.F. transformer’. 1941 Electronic Engin. 14 404 The L.F. input to the amplifier must be kept at the same voltage for all frequencies. 1971 Wireless World Apr. 184/2 It follows that the difference frequency produced when h.f. noise is sampled at a high rate will be l.f. noise. Lf Lf n. [notionally < limit of flocculation] Medicine that quantity of a specified toxin which flocculates most rapidly when mixed with one unit of antitoxin; frequently attributive in Lf dose, Lf value. ΘΚΠ the world > life > biology > substance > process stimulators or inhibitors > toxin > [noun] > quantity of Lf1924 1924 A. T. Glenny & C. C. Okell in Jrnl. Pathol. & Bacteriol. 27 189 We think it useful to employ the symbol Lf for the amount of a toxin equivalent to 1 unit of a standard antitoxin as established by flocculation... The Lf value may therefore be added to the Lo, L+ and Lr values in defining the combining properties of individual toxins. 1949 Jrnl. Hygiene 47 107/1 The potency of toxins and toxoids, as measured by the Lf dose, may constitute some rough measure of antigenic efficiency. 1981 Lancet 1 Aug. 219/2 Single doses (100 Lf or 250 Lf) of a potent tetanus toxoid were given to such individuals with naturally acquired antitoxin. < as lemmas |
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