smooth strain

Dictionary of molecular biology. 2004.

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  • strain — 1. A population of homogeneous organisms possessing a set of defined characteristics; in bacteriology, the set of descendants that retains the characteristics of the ancestor; members of a s. that subsequently differ from the original isolate are …   Medical dictionary

  • S strain — smooth strain a type of strain that results from bacterial dissociation; smooth or S colonies have a smooth surface and an unbroken border, growth in fluid media tends to be diffuse; capsules, if present at all, are found in this strain, and the… …   Medical dictionary

  • rough strain — Bacterial strains that have altered outer cell wall carbohydrate chains causing colonies on agar to change their appearance from smooth to dull. In Streptococci the smooth strains are virulent whereas the rough strains are not. This is partly… …   Dictionary of molecular biology

  • Frederick Griffith — (1879 1941) was a British medical officer and geneticist. In 1928, in what is today known as Griffith s experiment, he discovered what he called a transforming principle , which is today known to be DNA. [cite journal |author=Lorenz MG,… …   Wikipedia

  • muscle — n. 1) to contract; flex, tense; move; pull, strain; relax; wrench a muscle 2) to develop one s muscles 3) involuntary; smooth; striated; voluntary muscles 4) muscles ache * * * [ mʌs(ə)l] flex move pull relax …   Combinatory dictionary

  • Colin Munro MacLeod — For the Scottish activist Colin Macleod, died 2005, see GalGael Trust. Colin Munro MacLeod (January 28, 1909 February 11, 1972) was a Canadian American geneticist. Colin MacLeod, geneticist Biography Born in Port Hastings, Nova Scotia, Canada… …   Wikipedia

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  • rock — rock1 rockless, adj. rocklike, adj. /rok/, n. 1. a large mass of stone forming a hill, cliff, promontory, or the like. 2. Geol. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable… …   Universalium

  • drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… …   Universalium

  • Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… …   Universalium

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