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bacterium    音标拼音: [bækt'ɪriəm]
n. 细菌

细菌

bacterium
n 1: (microbiology) single-celled or noncellular spherical or
spiral or rod-shaped organisms lacking chlorophyll that
reproduce by fission; important as pathogens and for
biochemical properties; taxonomy is difficult; often
considered to be plants [synonym: {bacteria}, {bacterium}]

Bacterium \Bac*te"ri*um\ (b[a^]k*t[=e]"r[i^]*[u^]m), n.; pl.
{Bacteria} (b[a^]k*t[=e]"r[i^]*[.a]). [NL., fr. Gr.
bakth`rion, ba`ktron, a staff: cf. F. bact['e]rie.] (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}.
[1913 Webster PJC]

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  • Bacteria - Wikipedia
    Bacteria ( b æ k ˈ t ɪər i ə ⓘ; sg : bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell They constitute a large domain of prokaryotic microorganisms
  • Bacteria: Definition, Types, Benefits, Risks Examples
    Bacteria are microscopic living organisms that have only one cell The word for just one is “bacterium ” Millions (if not billions) of different types of bacteria can be found all over the world, including in your body They’re on your skin and in your airways and mouth
  • Bacteria | Cell, Evolution, Classification | Britannica
    bacteria, any of a group of microscopic single-celled organisms that live in enormous numbers in almost every environment on Earth, from deep-sea vents to deep below Earth’s surface to the digestive tracts of humans
  • Bacteria - Definition, Shapes, Characteristics, Types Examples
    Bacteria are single-celled microorganisms with prokaryotic cells, which are single cells that do not have organelles or a true nucleus and are less complex than eukaryotic cells Bacteria with a capital B refers to the domain Bacteria, one of the three domains of life
  • Bacteria: Definition Characteristics With Examples Diagram
    Bacteria are disease-causing, microscopic, single-celled organisms with prokaryotic cell structures They do not have membrane-bound organelles, including a true nucleus Being the lowest and simplest form of life, they are found almost everywhere on earth and thus, are the most dominant living creature
  • Bacteria - Definition, Structure, Types Infections - Rs Science
    Bacteria (singular: Bacterium) are single-celled microorganisms The cell structure of bacteria is much simpler than that of eukaryotic cells There are no nucleus or membrane-bound organelles in a bacterial cell Thus, bacteria are classified as “Prokaryotic cells”
  • What are bacteria? - Live Science
    Bacteria are single-celled organisms with a unique internal structure Humans and other multicellular organisms are eukaryotes, which means our cells have distinct nuclei bound with a membrane
  • What are Bacteria?- A Complete Study Note and Guide - Microbe Notes
    Bacteria, a singular bacterium, is derived from the Ancient Greek word “backērion” meaning “cane”, as the first bacteria observed were bacilli The study of ‘Bacteria’ is called ‘Bacteriology’; a branch of ‘Microbiology’
  • Introduction to the Bacteria - University of California Museum of . . .
    Introduction to the Bacteria Bacteria are often maligned as the causes of human and animal disease (like this one, Leptospira, which causes serious disease in livestock) However, certain bacteria, the actinomycetes, produce antibiotics such as streptomycin and nocardicin; others live symbiotically in the guts of animals (including humans) or elsewhere in their bodies, or on the roots of





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