Page 53 - MNU microbiology theoritical 2025

General Microbiology & Immunology (PM 401) Second level Semester 4 2024/2025

• light for energy • Energy source: • Energy source: • Energy source:

• Organic electron light energy inorganic chemical inorganic chemical

donor • Inorganic electron compound compound

• Organic carbon donor • Electron source: • Electron source:

source. • Carbon source: inorganic donor organic donor

Example: Purple and carbon dioxide. • Carbon source: • Carbon from the
green non-sulfur Example: Purple and carbon dioxide oxidation of
bacteria, Green Sulphur bacteria
Example: preformed organic

Nitrifying compounds.

bacteria • These include

Most bacteria

Environmental requirements

1- Temperature
2- Oxygen requirements
3- PH
4- Osmotic pressure

1- Temperature

a. Minimum growth temperature: the lowest
temperature at which the species will grow

b. Optimum growth temperature: species grow best

c. Maximum growth temperature: the highest
temperature at which growth is possible.

Types of microorganisms according to their optimum temperature

General Microbiology & Immunology (PM 401) theoretical handbook Page 42