mycology wk 1

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  1. hypha
    branching, threadlike, tubular filaments
  2. mycelium
    mat of hyphae
  3. conidia
    asexual reproductive units of fungi
  4. "perfect" stage
    sexual stages
  5. fungi are classified by
    • spores.  
    • zygoycota, basidiomycota, ascomycota
    • deuteromycota (imperfecti)
  6. deuteromycetes
    • Fungi imperfecti
    • no "perfect" or sexual stage
  7. mycotoxicoses
    • pre-formed toxic substances released that cause disease (more intoxication than disease)
    • a way that fungus causes disease
  8. Mycoses
    • active growth on or in an animal to cause disease
    • classified by location (SQ, systemic, cutaneous)
  9. ergosterol
    sterol of fungi that is the target of most antifungal drugs (synthesis or sterol is target)
  10. Fungi cell wall
    rigid cell wall determines shape of fungi (90% carbohydrate), includes chitin, ergosterol, mannose and glucose polymers
  11. pseudohyphae
    when buds don't separate from mother cell.  Form chains but aren't actually hyphae (can't communicate).  Look like snowman chains
  12. Septate vs aseptate
    mold hyphae can have crosswalls, still in contact through gap junctions.  Pseudohyphae are not in contact
  13. vegetative hyphae
    anchor mold to surface, absorb food.  Flat, spreading mold.
  14. aerial hyphae
    • project above surface of vegetative hyphae
    • contain reproductive elements
  15. dimorphism
    • some fungi can be unicellular at one temp (inside host) and have hyphae in infectious form outside host.  
    • Different structural proteins and polysaccharides
  16. blastoconidia
    yeast spores/conidia -- buds
  17. conidia (+ 6 kinds)
    • asexual reproductive unit of fungus, used for ID
    • light and dry
    • Macroconidia (Pod vs septated stick): whole hyphae converts, breaks off and goes together
    • Microconidia: single cell that can break off and become new fungus
    • chlamydoconidia: thick-walled, formed in stress like bacterial endospore
    • Arthroconidia (series of bars) and phialoconidia (series of balls): break up into individuals and each is microconidia
    • Sporaniospore and sporangia: balls of endospores, each endospore dividing and can be microconidia
  18. spherules
    balls of endospores that can rupture and seed new fungus.  Come from conidia.  Coccidioides use these (arthroconidia)
  19. biochemical features of fungi
    • heterotrophic (need organic molecules)
    • majority are strict aerobes (some not obligate)
    • some produce siderophores for iron acquisition
    • grow best at lower temps, 25-30 which is why most aren't pathogenic
    • stain gram+ (but aren't technically)
    • use paired cultures for dimorphic
    • culture more slowly than bacteria
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mycology wk 1
2016-10-05 01:47:30

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