One of the two major classes of prokaryotic organism (the other being the Cyanobacteria). Bacteria are small (linear dimensions of around 1 m m), non-compartmentalised, with circular DNA, and ribosomes of 70S. Protein synthesis differs from that of eukaryotes, and many anti-bacterial antibiotics interfere with protein synthesis, but do not affect the infected host. Recently bacteria have been subdivided into Eubacteria and Archaebacteria, although some would consider the Archaebacteria to be a third kingdom, distinct from both Eubacteria and Eukaryotes. The Eubacteria can be further subdivided on the basis of their staining using Gram stain. Since the difference between Gram positive and Gram negative depends upon a fundamental difference in cell wall structure it is therefore more soundly based than classification on gross morphology alone (into cocci, bacilli, etc.).

Dictionary of molecular biology. 2004.

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  • bacteria — f. microb. Organismo unicelular y procariota perteneciente al reino monera. Su aspecto externo es variado: puede poseer una forma esférica (coco), alargado (bacilo) o helicoidal y aunque se pueden encontrar aisladas, cuando las condiciones son… …   Diccionario médico

  • bacteria — [bak tir′ē ə] pl.n. sing. bacterium [bak tir′ēəm] or bacteria [ModL, pl. of bacterium < Gr baktērion, dim. of baktron, a staff: see BACILLUS] any of a division (Bacteria) of monerans, microorganisms which are typically one celled, have no… …   English World dictionary

  • Bacteria — Bac*te ri*a, n. pl. See {Bacterium}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Bacterĭa — Bacterĭa, Gattung der Gespensterheuschrecken …   Pierer's Universal-Lexikon

  • bacteria — 1847, plural of Mod.L. bacterium, from Gk. bakterion small staff, dim. of baktron stick, rod, from PIE *bak staff used for support. So called because the first ones observed were rod shaped. Introduced as a scientific word 1838 by German… …   Etymology dictionary

  • bactéria — s. f. Nome geral dado aos micróbios unicelulares de forma alongada (bacilos), esférica (cocos) ou espiralada, sem membrana nuclear e que se alimentam segundo o modo vegetal …   Dicionário da Língua Portuguesa

  • bacteria —  Bacteria  Бактерии   Одноклеточные безъядерные живые организмы, обычно диаметром около одного микрона. Бактерии являются одними из самых древних, мельчайших и наиболее простых типов клеток. К настоящему времени описано около десяти тысяч видов… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • bacteria — [n] microorganisms bacilli, germs, microbes, organisms, pathogens; concepts 306,393 …   New thesaurus

  • bacteria — sustantivo femenino 1. Microorganismo formado por una sola célula sin núcleo, que puede causar enfermedades como el cólera, o que interviene en procesos químicos como la fermentación: Hay bacterias buenas y malas para el hombre …   Diccionario Salamanca de la Lengua Española

  • bacteria — (Del gr. βακτηρία, bastón). f. Biol. Microorganismo unicelular procarionte, cuyas diversas especies causan las fermentaciones, enfermedades o putrefacción en los seres vivos o en las materias orgánicas …   Diccionario de la lengua española

  • bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/,, sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …   Universalium

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