coccus
The cocci are spherical or nearly spherical, and their size is expressed by cell diameter, which is generally 0.5 ~1.0 μ m. Due to the different division surfaces of cocci, they can be divided into the following categories according to the state after reproduction:
1) Monococcus cells divide along a plane, and daughter cells are scattered and exist alone, such as Micrococcus urealyticum;
2) Dicoccus cells divide along a plane, and daughter cells are arranged in pairs, such as pneumococcus, also known as Streptococcus pneumoniae, which is sometimes short-chained;
3) Streptococcus cells divide along a plane, the second cell division is parallel to the first division plane, and the daughter cells are arranged in chains, such as Streptococcus lactis and Streptococcus agalactiae, which are composed of multiple cells;
4) Tetracoccus cells divide according to two mutually perpendicular planes, and the daughter cells are arranged in a field, such as Micrococcus tetragonorrhoeae;
Tetracoccus smear
5) The cells of Azimuth divide according to three mutually perpendicular planes, and the daughter cells T are stacked together and arranged in a cubic arrangement, such as methane Azimuth and urea Azimuth;
6) The cell division of staphylococcus is directionless, and the daughter cells are arranged in a grape shape, such as Staphylococcus aureus, a widely distributed and common pathogen.
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