There are three kinds: turbid growth, precipitation growth and biofilm growth (surface growth).

1. Turbid growth: Most bacteria grow and multiply in liquid medium, and then they are evenly turbid. Such as Escherichia coli and Shigella.

2. Precipitation growth: a few chain-shaped bacteria, such as Streptococcus and Bacillus anthracis, grow in precipitation.

3. Growth of biofilm (surface growth): obligate aerobic bacteria such as Bacillus subtilis, Mycobacterium tuberculosis and Pseudomonas aeruginosa generally grow on the surface and often form biofilm.

Extended data:

Due to the growth of bacteria, the inoculated liquid medium will become turbid. Turbidity varies with the bacterial oxygen demand: aerobic bacteria only make the upper medium turbid, anaerobic bacteria make the bottom medium turbid, and accumulated anaerobic bacteria make the upper and lower medium turbid evenly; Some bacteria will form rings or films on the surface of the medium, or precipitate on the bottom of the medium.

The growth of bacteria in liquid medium. Liquid culture medium is mainly used for bacterial growth. Bacteria grow and reproduce in liquid culture medium, indicating that the liquid becomes turbid, a bacterial film is formed on the surface, and precipitation is formed at the bottom of the culture tube.

References:

Baidu encyclopedia-bacterial culture

References:

Baidu encyclopedia-bacterial colony