Bacteria.pptxmmmmmmmmmmmmmmmmmmmmmmmmmmm

microbiology

1. Bactreia Prepared by students : Razan Ahmed Alnour Sarah Salah Al- Shammari Supervisior / Dr. Dalia Saeed Hamza

2. Bacteria Bacteria form a group of organisms primitive nuclei, treated by man without seeing them, it has been known to cause disease and used some of them in various fermentation processes . And the discovery of the microscope had a great impact on her identification. Definition of bacteria : They are unicellular microorganisms that have everything they need to do all the basic functions of life.

3. General properties of bacteria 1 )primitive micro-organisms nuclei . ‏ 2) featuring simple structure It is formed from a cell wall and membrane surrounding the cytoplasm that contains a single ring chromosome DNA ‏ 3 ) its wall hardness comes for the presence of a polypeptide ‏ 4 ) multiply by simple binary fission ‏ 5 ) in order for bacteria cells to be clearly seen under a microscope, we need to use different

4. Forms of bacteria A) spherical bacteria :‏They may be single or chain-shaped, such as pneumonitis bacteria, or bilateral, quadruple, or more irregular clusters . ‏ B ) Bacillus bacteria :‏They may be single, chain-shaped or receptive in shape, such as cholera bacteria . ‏ C) spiral bacteria :‏They are the largest, like the bacteria of syphilis .

5. Types of bacteria based on their way of nutrition Autotrophic : are bacteria that make food needs for them from their primary sources may use the light energy so called photo autotrophic or use chemical energy so called chemo autotrophic . ‏ B) Heterotrophic: non-self-feeding bacteria usually live within living organisms

6. Benefits of bacteria - Analyze the bodies of dead creatures to feed on them. Fixation of atmospheric nitrogen in the root cells of certain plants ‏. - Used in the manufacture of a lot of food such as: vinegar, some types of cheese, turn milk into milk ‏ - Extraction of primitive starch from the roots of plants.

7. Author: Dr.. Mohamed El- Sawy Mohamed Mubarak Dr .. Abdelwahab Mohamed Abdelhaf Dr.. Rawya Fathi Jamal Publication year 2005 Book name: The world of bacteria Publisher: Osiris Library