bacterium definition

  • noun:
    • Any of the unicellular prokaryotic microorganisms of the class Schizomycetes, which vary in terms of morphology, oxygen and nutritional requirements, and motility, and may be free-living, saprophytic, or pathogenic in plants or animals.
    • A single celled organism without any nucleus.
    • A microscopic single-celled system having no distinguishable nucleus, of the kingdom Monera. Bacteria have actually different shapes, often taking the as a type of a jointed rodlike filament, or a little world, but additionally in some instances having a branched kind. Bacteria are destitute of chlorophyll, however in those people in the phylum Cyanophyta (the blue-green algae) other light-absorbing pigments can be found. They are the tiniest of microscopic organisms which have unique metabolic procedures carried on within mobile membranes, viruses becoming smaller yet not with the capacity of residing easily. The bacteria are particularly widely diffused in general, and multiply with marvelous rapidity, both by fission and by spores. Bacteria may necessitate air for their energy-producing metabolic process, that are known as aerobes; or may grow inside absence of air, these kinds being anaerobes. Certain species are active agents in fermentation, while some seem to be the reason for particular infectious conditions. The part of research with scientific studies bacteria is bacteriology, becoming a division of microbiology. See bacillus.
    • the micro-organisms which are worried within the putrefactive procedures, as they are generally Schizomycetes, or fission fungi, in distinction from Saccharomycetes, or budding fungi, which produce alcoholic fermentation.
    • A genus of microscopic fungi, consisting of one brief cylindrical or elliptical mobile, or of two these types of cells united end to end, and with the capacity of natural movement.
    • (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens as well as for biochemical properties; taxonomy is hard; frequently regarded as being plants

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