The influence of biological factors on the growth of microorganisms

The existence and development of microorganisms are directly influenced by factors of the surrounding environment such as temperature, light, chemicals, radiation, pH... These factors can be divided into 3 large groups: physical factors, chemical factors and biological factors. Understanding the influence of these factors on the growth of microorganisms for application in sterilization, sterilization of medical instruments, pharmaceuticals, environmental disinfection, operating rooms, patient rooms, microbiology research...

During the existence of microorganisms, if they must live in the presence of other microorganisms, they can compete for survival, be destroyed or coexist.

Antagonist (Bacteriocin)

Many types of bacteria, when growing, synthesize antagonistic substances that inhibit bacteria of the same or neighboring species. For example Colixin of E.coli, Staphylococxin of Staphylococci... They have a protein nature or a complex of glucit-lipid-protein, which has a specific effect on sensitive bacteria.

Phage

As bacterial viruses, phages invade specific bacteria, multiply, and disrupt bacterial cells. Phage can also coexist and multiply with bacteria in a temperate state.

Interferon

Is a substance produced by cells when infected with a virus, has a glycoprotein nature, has the effect of inhibiting the replication of the virus.

Stimulant

Some bacteria, when growing, produce a substance that favors the growth of other bacteria. For example, Hemophilus grows well around Staphylococci colonies (because Staphylococci produce factor V necessary for Hemophilus to grow)...

Related articles: 

- Pathogenic microorganisms in nature

- Pathogenicity of microorganisms

- Genetic basis of virulence of pathogenic microorganisms

- Avoidance with the immune response of pathogenic microorganisms

- Pathogenic microorganisms in the human body