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acteriophages

B. acteriophages. Bacteriophages. They are viruses that infect bacteria i.e. bacterial viruses (bacteria eater). 1-Discovery. 3-Replication. Main items. 2-General characteristics. 4-Importance. 1-Discovery. Main items. D “ herelle (1917). Twort (1915). Discovery.

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acteriophages

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  1. B acteriophages

  2. Bacteriophages They are viruses that infect bacteria i.e. bacterial viruses (bacteria eater).

  3. 1-Discovery 3-Replication Main items 2-General characteristics 4-Importance

  4. 1-Discovery Main items

  5. D“herelle (1917) Twort (1915) Discovery

  6. Bacteria + solid agar Thermal treatment Lytic agent may be a virus

  7. Bacillus dysentrae + solid agar Phenomenon due to bacteriophage

  8. 1-Discovery Main items 2-General characteristics

  9. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size • Cultivation.

  10. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size • Cultivation.

  11. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size. • Cultivation.

  12. Symmetry : 1.Helical 2. Cubic

  13. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size. • Cultivation.

  14. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size. • Cultivation.

  15. A D B E F C

  16. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size. • Cultivation.

  17. Replication 1. Virulent (Lytic) 2. Avirulent (lysogenic or temperate)

  18. General characteristics • Widely distributed. • Structure. • Symmetry. • Nucleic acid. • Morphology. • Replication. • Size. • Cultivation.

  19. 1-Discovery 3-Replication Main items 2-General characteristics

  20. Lytic cycle Replication Releasing Adsorption Assembly Penetration

  21. Summary of virulent cycle

  22. Lysogeny cycle Integration Releasing Adsorption Assembly Penetration Replication Bacterial duplication Spontaneous induction

  23. Mutation of temperate phage to virulent phage • Resistant to repressor molecule . • Loss repressor molecule production.

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