semisynthetically
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tetracyclines — (tet rah si klĭns) A family of antibiotics with a common four ring structure, which are isolated from the genus Streptomyces or produced semisynthetically; all are related to chlortetracycline or oxytetracycline … Dictionary of microbiology
penicillin — /pen euh sil in/, n. Pharm. any of several antibiotics of low toxicity, produced naturally by molds of the genus Penicillium and also semisynthetically, having a bactericidal action on many susceptible Gram positive or Gram negative cocci and… … Universalium
tetracycline — /te treuh suy kleen, klin/, n. Pharm. an antibiotic, C22H24H2O8, derived from chlortetracycline, used in medicine to treat a broad variety of infections. [1950 55; TETRA + CYCL + INE] * * * Any of a class of broad spectrum antibiotics with a… … Universalium
alkaloid — Originally, any one of hundreds of plant and fungal products distinguished by alkaline (basic) reactions, but now restricted to heterocyclic nitrogen containing and often complex structures possessing pharmacologic activity; their trivial name s… … Medical dictionary
cephalosporin — This is an antibiotic produced by a Cephalosporium, but since the antibiotic was discovered the name Cephalosporium has been removed and the new name is Acremonium. c. C an antibiotic whose activity is due to the 7 aminocephalosporanic acid… … Medical dictionary
demeclocycline — A broad spectrum antibiotic that is more slowly excreted and more stable in acid and alkali than are other forms of the tetracyclines; available as the hydrochloride. * * * de·mec·lo·cy·cline .dem ə klō sī .klēn n a broad spectrum tetracycline… … Medical dictionary
estradiol — β E.; 17β e.; the most potent naturally occurring estrogen in mammals, formed by the ovary, placenta, testis, and possibly the adrenal cortex; therapeutic indications for e. are those typical of an estrogen. α E. (17α e.), exhibits considerably… … Medical dictionary
taxanes — A class of antitumor agents derived directly or semisynthetically from Taxus brevifolius, the Pacific yew; examples include paclitaxel and docetaxel … Medical dictionary
tetracycline — A broad spectrum antibiotic (a naphthacene derivative), the parent of oxytetracycline, prepared from chlortetracycline and also obtained from the culture filtrate of several species of Streptomyces; also available as t. hydrochloride and t.… … Medical dictionary
cephamycin — cepha·my·cin .sef ə mīs ən n any of several beta lactam antibiotics that are produced by various bacteria of the genus Streptomyces and are related to the cephalosporins * * * ceph·a·my·cin (sef″ə miґsin) any of a family of naturally… … Medical dictionary
