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Bacterium   Listen
noun
Bacterium  n.  (pl. bacteria)  (Biol.) A microscopic single-celled organism having no distinguishable nucleus, belonging to the kingdom Monera. Bacteria have varying shapes, usually taking the form of a jointed rodlike filament, or a small sphere, but also in certain cases having a branched form. Bacteria are destitute of chlorophyll, but in those members of the phylum Cyanophyta (the blue-green algae) other light-absorbing pigments are present. They are the smallest of microscopic organisms which have their own metabolic processes carried on within cell membranes, viruses being smaller but not capable of living freely. The bacteria are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Bacteria may require oxygen for their energy-producing metabolism, and these are called aerobes; or may multiply in the absence of oxygen, these forms being anaerobes. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. The branch of science with studies bacteria is bacteriology, being a division of microbiology. See Bacillus.






Collaborative International Dictionary of English 0.48








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"Bacterium" Quotes from Famous Books



... an acute infective disease due to the action of a specific bacterium, the bacillus diphtheriae or Klebs-Loffler bacillus. The disease is usually transmitted from one patient to another, but it may be contracted from cats, fowls, or through the milk of infected cows. Cases have occurred ...
— Manual of Surgery - Volume First: General Surgery. Sixth Edition. • Alexis Thomson and Alexander Miles

... publish until he had made quite sure of his ground. This question and the preparation of the course of Elementary Biology [See below.] led him to carry on a series of investigations lasting over two years, which took shape in a paper upon "Penicillium, Torula, and Bacterium", first read in Section D at the British Association, 1870 ("Quarterly Journal of Micr. Science" 1870 10 pages 355-362.); and in his article on "Yeast" in the "Contemporary Review" for December 1871. He laboriously repeated ...
— The Life and Letters of Thomas Henry Huxley Volume 2 • Leonard Huxley

... possible development of masses will be found in Chrenberg's great work 'Die Infusionsthierchen als volkommne Organismen', 1838, s. xiii., xix., and 244. "The Milky Way of these organisms comprises the genera Monas, Vibrio, Bacterium, and Bodo." The universality of life is so profusely distributed throughout the whole of nature, that the smaller Infusoria live as parasites on the larger, and are themselves inhabited by others, ...
— COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 • Alexander von Humboldt

... seen that bacteria differ greatly in appearance from the elongated dot of the bacterium proper, to the elongated rod or cylinder of the bacillus, and the long spirals of spiro-bacteria. It is unfortunate that they are not sufficiently constant in habit to always attach themselves to one or the other of these genera. The micrococcus has a habit of ...
— Scientific American Supplement, No. 787, January 31, 1891 • Various

... complaints (such as toothache) to worms, visible as well as microscopic, which may be held a fair prolepsis of the "germ-theory" the bacterium. the bacillus, the microbe. Nymphomania, the disease alluded to in these two tales is always attributed ...
— The Book of the Thousand Nights and a Night, Volume 4 • Richard F. Burton



Words linked to "Bacterium" :   bacterioidal, resistance, Neisseria gonorrhoeae, peritrichous, probiotic bacterium, bacterial, acidophil, microphage, probiotic microflora, nitrobacterium, immune reaction, microbiology, superbug, nitrous bacterium, Calymmatobacterium, rod, penicillin-resistant bacteria, nitric bacterium, genus Calymmatobacterium, Legionella pneumophilia, bacterise, gonococcus, eubacterium, immune response, acidophile, micro-organism, ratbite fever bacterium, Gram-positive, genus Francisella, diplococcus, nitrite bacterium, microorganism, pus-forming bacteria



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