Lactam
Lactam Lac"tam, n. [Lactone + amido.] (Chem.) One of a series of anhydrides of an amido type, analogous to the lactones, as oxindol; a cyclic amide. [1913 Webster]

{beta-lactam} or {[beta]-lactam}, (a) a lactam in which the amide bond is contained within a four-membered ring, which includes the amide nitrogen and the carbonyl carbon. (b) an antibiotic containing a beta-lactam, such as a {penicillin}, {cephalosporin}, or {carbapenem}; also called a {beta-lactam antibiotic}. [informal, laboratory slang] [PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • lactam — Amida cíclica que se forma mediante la eliminación de una molécula de agua de una molécula de ácido aminocarboxílico. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

  • lactam — [lak′tam΄] n. [ LACT(ONE) + AM(INO)] any of a group of organic cyclic compounds containing the NHCO group in the ring, formed by the elimination of water from the amino and carboxyl groups; inner anhydride of an amino acid …   English World dictionary

  • Lactam — From left to right, general structures of a β lactam, a γ lactam, a δ lactam and a ε lactam. A lactam (the noun is a portmanteau of the words lactone + amide) is a cyclic amide. Prefixes indicate how many carbon atoms (apart from the carbonyl… …   Wikipedia

  • Lactam — Allgemeine Struktur von β , γ und δ Lactamen. Als Lactame (Singular: das Lactam; Synonym: intramolekulares, cyclisches Amid, Kunstwort aus Lacton und Amin) bezeichnet man Moleküle in der …   Deutsch Wikipedia

  • Lactam — Lac|tam 〈n. 11; Biochem.〉 zyklisches Säureamid, z. B. Caprolactam; oV Laktam [<lat. lac, Gen. lactis „Milch“] * * * Lac|tam [↑ Lacton u. ↑ Amid], das; s, e: Gruppenbez. für aus Aminosäuren durch intramol. Dehydratisierung entstandene cycl.… …   Universal-Lexikon

  • lactam — laktamas statusas T sritis chemija apibrėžtis Vidinis ciklinis aminorūgšties amidas, turintis žiede –CONH– grupę. atitikmenys: angl. lactam rus. лактам …   Chemijos terminų aiškinamasis žodynas

  • lactam — /lak tam/, n. Chem. any of a group of cyclic amides characterized by the NHCO group, derived from aminocarboxylic acids by the intramolecular elimination of water from the amino and carboxylic groups. [1880 85; LACT(ONE) + AM(IDE)] * * * …   Universalium

  • lactam — noun Any of a class of cyclic amides, that are the nitrogen analogs of lactones, formed by heating amino acids; the tautomeric enol forms are known as lactims …   Wiktionary

  • lactam — lac·tam lak .tam n any of a class of amides of amino carboxylic acids that are formed by the loss of a molecule of water from the amino and carboxyl groups, that are characterized by the carbonyl imido group CONH in a ring, and that include many… …   Medical dictionary

  • Lactam — Lac|tam 〈n.; Gen.: s, Pl.: e; Chemie〉 ringförmig gebaute aliphat. Verbindung, die u. a. durch intramolekulare Wasserabspaltung aus einem Molekül einer höheren Aminosäure entsteht; oV [Etym.: <lat. lac, Gen. lactis »Milch« + Amid] …   Lexikalische Deutsches Wörterbuch

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