Bacterial morphology
(1) Cocci:
Cocci are bacteria with a spherical or elliptical shape, ranging from 0.5 to 1 micron in diameter, and are of the following types: 1 monococci: alone, such as urea cocci; 2 cocci: such as pneumococci; 3 streptococcus: Streptococcus mutans; 4 four-cocci: four cells formed together, Narita, such as tetracocci; 5 octacocci: such as urea sphaeroides; 6 staphylococcus: such as Staphylococcus Aureus).
(2) Bacillus:
The rod-like bacteria are called bacilli, and often have short or rod-shaped bacteria with close length and width, such as Methano-brevibacter; rod-shaped or long rod-shaped bacteria with large differences in length and width, such as Bacillus subtilis, Bacterium fusiformis; branched or forked bacteria, such as Bifidobacterium; bamboo-like (closed ends), such as Bacillus anthracis Wait.
According to the arrangement of the bacillus cells, there are pairs of double bacilli and chain-shaped bacillus, and there are often a plurality of types such as a grid shape, an "eight" shape, and a filament shape wrapped by a sheath. Typical bacilli are Escherichia coli, Bacillus subtilis, Streptomyces, and Proteus.
(3) Spiral:
The spiral bacteria are called spiral bacteria, generally 5 to 50 microns long and 0.5 to 5 microns wide. According to the bending of the bacteria, they can be divided into: 1 Vibrio: the one with a spiral is banana or comma. Such as Vibrio cholerae; 2 Spirillum: small, hard spiral bacteria with 2 to 6 rings, such as Spirillum minor; 3 spiral (Spirochaeta): more rotation cycles ( Usually more than 6 rings), long and soft spiral bacteria, such as Treponema paUidum.