UC mycology

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Anonymous
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76120
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UC mycology
Updated:
2011-03-29 23:10:03
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Mycology
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UC mycolocgy Mod 1
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  1. Bacteriology vs. Mycology
    • Study of fungi is more simple than bacteria
    • – Colony morphology
    • – Microscopic structures
    • – Smaller field
    • • Only about 60 consistent species
    • – Biochemical tests seldom used
    • • Person to person transmission very rare
    • – Outbreaks can usually be traced to common source
  2. Fungi
    Def: “a group of non-motile eukaryotic organisms that have definite cell walls, are devoid of chlorophyll, and reproduce by means of spores (and conidia)”

    - Heterotrophic, Eukaryotic Vs. prokaryotic
  3. The fungal organism
  4. • Capsule
    • • Cell wall
    • • Cell membrane
    • • Cytoplasm
    • – Nucleus, nucleolus, nuclear membrane, ER, mitochondria, vacuoles
  5. Capsule
  6. • Polysaccharide
    • – Much larger than bacterial capsule
    • • Antiphagocytic, virulence
    • -Prevents the organism from being targeted during phagocytosis.
    • - allows the organism to control its local environment
    • • Mostly in yeast
    • – Cryptococcus neoformans – encapsulated yeast
  7. Fungal cell wall
  8. • Antigenic portion of the yeast
    • • Multilayered
    • – Polysaccharides (90%)
    • – Chitin
    • – Proteins and glycoproteins (10%)
    • • Provides shape and rigidity to cell
    • – Osmotic protection
    • -offers the best unique structures compares to mammalian cells as a target for antifungal agents
  9. Cell membrane
  10. • Bilayered phospholipids
    • • Sterols (ergosterol- fungal vs. cholesterol- mammalian)
    • - Ergosterol provides a target for antifungal agents
    • • Functions:
    • – Protects cytoplasm
    • – Regulates intake of nutrients
    • – Facilitates capsule and cell wall synthesis
  11. Hyphae
    filamentous, tubular growth
  12. True hyphae
    tubular structure where cross was or symplate will form as a structure
  13. pseudohyphae
  14. yeast cells reproducing end on end
  15. Septate (aseptate)
  16. cross walls in hyphae
  17. Spetate
  18. meaning with hyphae
  19. Aseptate
    without hyphae
  20. Mycelium (mycelia)-
  21. matt of hyphae that occurs while the organism grows
    – Vegetative- point downward into the gound– Aerial- reaises up in to the air
  22. Molds
    obligate hyphae
  23. Yeasts
    unicellular, budding
  24. Dimorphic
    • two bodies or forms where they will have both a mold and yeast form.
    • Most important are those that are thermally dimorphic
  25. Perfect fungi
    sexual stage is known and is well described
  26. Fungi Imperfecti
  27. no known sexual stage or not discribed
  28. Conidia
    Reproductive structures produced by an asexual mode
  29. Spore
  30. Reproductive structures produced sexually, and the asexual reproductive cells of the Zygomycetes
  31. Asexual reproduction
    Conidiophore & Sporangium
  32. Conidiophore
  33. – structure that supports conidia
    • – Anelloconidia – produced by anellides
    • – Phialoconidia – produced by phialide
    • – Poroconidia – produced from pores
  34. Sporangium
    saclike structure where sporangiospores are formed (Zygomycetes)

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