Bioécologie et biosystématique des bactéries et virus
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Introduction
Bacteria are unicellular organisms, with a single cell forming the bacterium. They can measure from 1 to 10 μm in length.
1- Characteristics
The classification of bacteria is generally based on the following characteristics:
- cell membrane diameter;
- form.
The cell wall of gram-positive bacteria is consisting of thick layers of peptidoglycan. The cell wall of gram-negative bacteria is consisting of thin layers of peptidoglycan.
During the gram staining procedure, a gram-positive cell retains the purple-colored stain. But do not retain the purple colored stain.
Gram-positive bacteria produce exotoxins.
Gram-negative bacteria produce endotoxins.
3- Bacterial propagation in agriculture
- Enseignant: Nacer Tarai
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