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单词 Bacterial index
释义

Bacterial index

英语百科

Bacteria

Bacteria display many cell morphologies and arrangements
A biofilm of thermophilic bacteria in the outflow of Mickey Hot Springs, Oregon, approximately 20 mm thick.
Structure and contents of a typical Gram positive bacterial cell (seen by the fact that only one cell membrane is present).

Bacteria (/bækˈtɪəriə/; singular: bacterium) constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals. Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust. Bacteria also live in symbiotic and parasitic relationships with plants and animals. They are also known to have flourished in manned spacecraft.

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更新时间:2025/6/18 2:52:20