| 单词 | lactose-negative |
| 释义 | > as lemmaslactose-negative lactose-negative adj. Microbiology (of a bacterium) unable to metabolize lactose; (also) designating the condition of being unable to metabolize lactose. ΚΠ 1914 Science 29 May 800/1 Of the dextrose positive lactose negative forms five liquefied gelatine and fermented dextrose and saccharose but failed to ferment any of the other sugars, with the exception of glycerine. 1951 Year Bk. (Carnegie Institution Washington) No. 50 187 Colonies obtained from such segregants should be composed..of lactose-negative mutants if the selected nucleus from which they arise happens to carry a second induced mutation, to the lactose-negative condition. 2009 R. E. Levin Rapid Detection & Characterization Foodborne Pathogens iii. 63 Members of the genus Shigella are facultatively anaerobic, gram-negative..nonmotile rods that are either lactose negative or ferment lactose slowly. < as lemmas |
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