英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

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]



安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • BACTERIUM Definition Meaning - Merriam-Webster
    The meaning of BACTERIUM is any of a domain (Bacteria) of chiefly round, spiral, or rod-shaped single-celled prokaryotic microorganisms that typically live in soil, water, organic matter, or the bodies of plants and animals, that make their own food especially from sunlight or are saprophytic or parasitic, are often motile by means of flagella, reproduce especially by binary fission, and
  • Bacteria: Definition, Types, Benefits, Risks Examples
    Each bacterium contains cytoplasm, ribosomes and DNA Outside the cell wall, one or more bacteria flagella help the bacterium move What are plastic-eating bacteria? In 2016, scientists in Osaka, Japan, discovered a species of bacteria called Ideonella sakaiensis It was eating its way through plastic bottles outside a recycling facility





中文字典-英文字典  2005-2009