23. Fungi - 3/24/2010 Fungi General features: Fungi they...

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3/24/2010 1 Fungi Fungi • General features: – they are saphrophytes (derive nourishment from dead material) or occasionally parasitic – ~250,000 known species, only ~100 are pathogens – slow growing eukaryotes – they can produce a wide variety of toxins Fungi • Can be divided into groups: 1) True pathogens a) cutaneous infective agents b) sub-cutaneous infective agents c) systemic infective agents 2) Opportunistic pathogens Fungi • Cellular components: – Cell wall contains chitin, a polymer of N- acetylglucosamine (vs peptidoglycan in bacteria) – Cell membrane contains ergosterol (vs cholesterol in mammals) – principle method of reproduction and spread is sporulation Fungi • Fungi are heterotrophs (require a preformed carbon source for growth) • Fungi secret degradative enzymes and then absorb the released nutrients • Fungi love dead and decaying matter (soil or water with debris) however given an opportunity that will colonize humans Fungi • Most fungi exist as either filamentous molds (cottony, fluffy colonies that grow up), or as unicellular yeasts (creamy, pasty colonies that grow out) • Some fungi are dimorphic (can switch between mold and yeast forms depending on temperature, CO 2 or other environmental trigger)
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3/24/2010 2 Filamentous Fungi (Molds) • Are composed of: – mycelium: a vegetative body made of many threads, looks like a cotton ball
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This note was uploaded on 05/09/2010 for the course LMP 232 taught by Professor Crandall during the Spring '10 term at University of Toronto- Toronto.

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23. Fungi - 3/24/2010 Fungi General features: Fungi they...

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