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Microbiology – Chapter 1

Microbiology – Chapter 1. Microbiology - The science that studies very small living things Usually requires a magnification tool – the microscope Some organisms are large though – Helminths – worms Sub groups of Microbes we will study Bacteria Archaea Fungi Protozoans Algae Viruses

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Microbiology – Chapter 1

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  1. Microbiology – Chapter 1 Microbiology - The science that studies very small living things Usually requires a magnification tool – the microscope Some organisms are large though – Helminths – worms Sub groups of Microbes we will study Bacteria Archaea Fungi Protozoans Algae Viruses Multicellular animal parasites – Helminths

  2. Microbiology – Chapter 1 Bacteria

  3. Microbiology – Chapter 1 Fungi

  4. Microbiology – Chapter 1 Protozoans Giardia Ameba

  5. Microbiology – Chapter 1 Viruses Bacteriophage Avian Flu

  6. Microbiology – Chapter 1 Helminth Tapeworm Ascaris round worm

  7. Microbiology – Chapter 1 Various disciplines of study within microbiology: Bacteriology, Mycology, Parisitology, Immunology, Epidemiology, Biotechnology Virology Environmental Microbiology Bioremediation

  8. Microbiology – Chapter 1 Historical review of the Science of Microbiology Robert Hook – 1665 – Englishman, used a primitive compound (two magnifying lenses) microscope, reported that life’s smallest units were little boxes – Cells, his work started the process of the development of the Cell theory of life

  9. Microbiology – Chapter 1 Hook’s microscope

  10. Microbiology – Chapter 1 Antoni Van Leeuwenhoek –1673 - probably the first person to observe living cells with a simple microscope, amateur scientist, ground his own lenses and described what we know today as bacteria – rod shaped , spiral shaped , etc. “animalcules”

  11. Microbiology – Chapter 1 Antoni Van Leeuwenhoek

  12. Microbiology – Chapter 1 Francesco Redi – 1668 – opposed the prevailing theory of Spontaneous Generation, maggots in meat , He used covered jars to show that maggots came from flies –strong evidence against spontaneous generation Now we teach the theory of Biogenesis – Life comes from Life But issue of Spontaneous Generation was actively believed for many more years

  13. Microbiology – Chapter 1 Francesco Redi

  14. Microbiology – Chapter 1 Edward Jenner is credited with first vaccine – in epidemics of smallpox during the late 1700’s he observed that milk maids didn’t get the disease, cattle had a similar disease – cowpox, milk maids had cow pox lesions, but not small pox, he purposefully took scrapings from cowpox blister and scraped a 8 year old volunteer. With the material – child got mild illness but not small pox, Vaccination comes from Latin word “vacca” meaning cow. Jenner laid the foundation for Pasteur’s later work with other vaccinations. (Vaccinia virus similar to Variola smallpox virus, today a possible bioterror weapon – genetically engineered variola?)

  15. Microbiology – Chapter 1 Jenner and vaccination

  16. Microbiology – Chapter 1 Pasteur – French sceintist that dealt the death blow to the spontaneous generation theory. He devised the ingenious curved necked flasks that prevented contaminated air from reaching boiled beef broth – the broth remained uncontaminated even though exposed to the air He was very lucky – no endopores present, or it would have failed (resitant to boiling)

  17. Microbiology – Chapter 1 1. He developed process we call Pasteuriztion – he heated wine to kill contaminating microbes – cured sick wine (today we heat treatment to kill pathogens in milk also) 2. He proved that fermentation was caused by a microbe – yeast 3. He developed vaccines for rabies and anthrax. Vaccines led to immunity to diseases that routinely killed many people, used to help people long before they understood how they even worked (science of Immunology) 4. He began the revolution in science that led to the Golden Age of Microbiology (from 1857-1914)

  18. Microbiology – Chapter 1

  19. Robert Koch - Developed Koch’s postulates – important technique for determining the actual microbial cause agent of a disease – more later, German, contemporary of Pasteur, several very important contributions 1. He discovered the tuberculosis bug (tubercle bacillus, Mycobacterium tuberculosis) 2. He discovered the cause of anthrax (Bacillus anthracis) – from blood of dead cattle, cultured bacteria in pure culture, injected bacteria in live cattle and they died, then again cultured the bacteria in pure culture. This led to the establishment of a procedure for determining microbial cause of disease (see p. ____-for modern application of Koch’s postulates) Microbiology – Chapter 1

  20. Microbiology – Chapter 1 Koch’s postulates

  21. Koch’s and Pasteur’s work helped establish the “Germ Theory of Disease” - that microorganisms cause disease (in people, animals, and even plants) Microbiology – Chapter 1

  22. Iwanowski 1892 - Discovered that plant disease can be caused by small organisms that were so small they passed through filters , Tobacco mosaic virus (TMV) was later identified as the cause - beginning of virology (Today we have discovered new and weird things like viroids, prions) See next slide Microbiology – Chapter 1

  23. Microbiology – Chapter 1

  24. Microbiology – Chapter 1 Paul Ehrlich, German doctor, wanted to find a “magic bullet” an agent that would kill the disease agent without hurting the patient (see the “Coming plague” video, part 1) 1. Developed Salvarsan, “salvation from syphilis”agent 2. This was an arsenical – arsenic compound, that was effective against syphilis Antimicrobial agent, medicine to treat a microbial disease, it was chemical – chemotherapy

  25. Microbiology – Chapter 1 • Syphilis spirochete: T. pallidum Paul Ehrlich

  26. Microbiology – Chapter 1 Joseph Lister – 1860’s, English surgeon that applied ideas of the germ theory to surgery, remembered the work of Semmelweis in Hungary in the 1840’s, if a Dr. would wash their hands childbed fever was prevented. He knew that phenol would kill bacteria; put 2 and 2 together and treated wounds with phenol - and no infection (phenol is the basic agent of today’s – Lysol) 1. First antiseptic use in surgery, chemicals used as agents on tissue before surgery (tissue treated with an antimicrobial agent – antiseptic, betadine) disinfectants are chemicals, used on a surface 2. Also proved that microbes cause surgical infections (today’s scourge –MRSA)

  27. Semmelweis

  28. Lister • Antisepsis in surgery

  29. Alexander Fleming - Scottish physician and bacteriologist - 1928 Observed mold growing on a bacteria culture, there was a ring of clearing around the mold where the bacteria didn’t grow, the mold was later found to be a Penicillium species and the naturally secreted chemical was called penicillin, an antibiotic 1. Antibiotics are natural agents 2. Synthetic drugs are chemicals produced in labs (sulfas) 3. Problems with them - toxicity, resistance, allergic reactions 4. Fleming’s work - shelved until early WWII, sulfas were failing, needed penicillin to cure battle field wounds 5. Now have thousands of antibiotics and synthetics (and a significant problem – resistance) Microbiology – Chapter 1

  30. Flemming and Penicillium

  31. Microbiology – Chapter 1 Salk - Polio vaccine, 1950’s polio was a scary epidemic, Salk developed a vaccine by treating the virus with formalin (IPV) inactivated polio virus Sabin 1963 live Polio virus vaccine, attenuated –altered virus, OPV-oral polio vaccine The work done on polio revolutionized the science of virology and we are seeing the results today in advances with Hepatitis and HIV viral infections - tissue culture and other techniques

  32. Avery and Macleod, DNA is genetic material

  33. Watson and Crick, DNA, 1953

  34. DNA Double helix • Double Helix

  35. Salk; IPV

  36. Sabin, OPV

  37. Microbiology – Chapter 1 Jacob and Monod – 1965 Did research on RNA and protein synthesis in bacteria - last necessary step in understanding how genetics works on a cellular level (Replication, Transcription, Translation – protein synthesis – expression of traits) Modern science thrives today only on the laid foundation of thousands of men and women who did mundane routine and often boring lab science. Don’t forget that we are here today because we stand on the shoulders of Giants – who were people just like you and me. (Who are the Giants today? CDC, USAMRID, young Joe or Mary the graduate student?, maybe you?)

  38. Microbiology – Chapter 1

  39. Microbiology – Chapter 1 • Classification, Taxonomy, Binomial Nomenclature - Yucchy!!!!! No one likes it. Just do it!!!

  40. The Classification of Living Things • Living organisms are assigned to groups based upon their similarities. • Systematics is the discipline of identifying and classifying organisms.

  41. Domains • The highest – largest category, recent addition • 3 domains • 1. Archaea – ancient “bacteria”, unicellular like bacteria, also simple cell structure (prokaryote – no nucleus) but have distinct metabolism (chemistry) allowing them to exist in “extreme” environments • 2. Bacteria – unicellular, prokaryote, found everywhere (Old kingdom name – Monera) • 3. Eukarya – unicellular to multicellular, complex and organized cells with nuclei and organelles (mitochondria)

  42. Domain Archaea • Archaea are single- celled organisms that lack a membrane-bound nucleus. - Prokaryote • Archaea can be found in environments that are too hostile for other life forms.

  43. Domain Bacteria • Bacteria are single- celled organisms that lack a membrane-bound nucleus. (Prokaryote also) • Bacteria are found almost everywhere on the planet Earth.

  44. Domain Eukarya • The cells of all eukaryotes have a membrane-bound nucleus. Members of the Domain Eukarya are further categorized into one of four Kingdoms. (know these kingdoms)

  45. Microbiology • Check your notes; Older 5 kingdom scheme is still widely used • Monera – bacteria (Prokaryotic) • Protista – Protozoans (Eukaryotic) • Fungi - yeast, molds, etc. (Eukaryotic) • Plant – photosynthetic producers (Eukaryotic) • Animals – heterotrophic consumers (Eukaryotic)

  46. Categories of Classification Domain Kingdom Phylum Class Order Family Genus Species

  47. Categories of Classification Domain - Dumb Kingdom - King Phylum - Philip Class – Came Order - Over Family - For Genus - Good Species - __ Spaghetti?

  48. Most inclusive Least inclusive Categories of Classification Domain Kingdom Phylum Class Order Family Genus Species

  49. Categories of Classification

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