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Chapter one Dr.Rania Momtaz A. Azab
This document provides an introduction to a lecture on bacteriology. It defines key terms like infection, pathogen, and virulence. It distinguishes between eukaryotic and prokaryotic cells, noting that bacteria and blue-green algae are prokaryotes. The structures of bacterial cells are described, including the cell wall, plasma membrane, cytoplasm, and additional structures like flagella and pili. Common shapes of bacteria are also noted. The document discusses early microscopists like Antoni van Leeuwenhoek and ends with a short quiz on the material.
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Chapter one Dr.Rania Momtaz A. Azab
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- 6. – Distinguish betweenEukaryotes and Prokaryotes. – Describe bacteria by their shapes and Structure also explain the function of its components. – Name some common Terms. – Explain the structural modifications (flagella) of the cell and their functional importance. By the end of the session you should be able to
- 7. What is Microbiology? microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye) – several classes of living beings • Based on the organization of their cellular structures, all living cells can be divided into two groups: eukaryotic and prokaryotic Prokaryotes bacteria & blue green algae Eukaryotes Animals, plants, fungi, protozoans, and algae Living beings
- 8. Common Terms •INFECTION: the establishment of a microorganism within a host. • PATHOGEN: Any microorganism that has the capacity to • cause disease. • VIRULENCE: quantitative measure of the likelihood of • causing disease. • OPORTUNISTICS: • Principle pathogens regularly cause disease • Opportunistic pathogens require a defect in the immune defence
- 9. Antioni van Leeuwenhoek •Leeuwenhoek is called "the inventor of the microscope" • Created a “simple” microscope that could magnify to ab out 275x, and published drawings of mi croorganisms in 1683 • Could reach magnifications of over 200x with simple gr ound lenses 3Dr.T.V.Rao MD
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- 12. Size of Bacteria •Unit of measuremen t in bacteriology is the micron (micrometre, µ m) • Bacteria of medical importance –0.2 – 1.5 µm in diameter –3 – 5 µm in length
- 15. Outer layer –two components: 1. Rigid cell wall 2. Cytoplasmic (Cell/ Plasma) membrane – present beneath cell wall Cytoplasm – cytoplasmic inclusions, ribosomes, mesosomes, g enetic material Additional structures –capsule, flagella, fimbriae (pili), spores Anatomy of A Bacterial Cell
- 16. who examined thefirst microorganisms? Who is bigger in size? (prokaryotes or Eukaryotes)? Where can we found bacteria ? What is the Function of cell wall ? Bacterial shapes are variable describe ? Bacterial Cell structure can be modified, how come?
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- 19. Robert Koch Louis PasteurAntioniVan click
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- 34. • The establishmentof a microorganism within a host. • Any microorganism that has the capacity to cause disease. • Quantitative measure of the likelihood of causing diseas. • The pathogen that require a defect in the immune defence.
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