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Micro Lecture 6

Micro Lecture 6 - Microbiology 31 Lecture 6 FUNGI AND...

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Microbiology 31 Lecture 6 FUNGI AND ANIMAL PARASITES Kingdom Fungi Most are multicellular eukaryotes A few are unicellular All are heterotrophic All are aerobic or facultative anaerobic Fungal Nutrition Heterotrophs that acquire their nutrition or nutrients by absorption. Most are saprophytic; they absorb nutrition from dead organisms. A few are parasitic; they absorb nutrition from living hosts. A few are mutualistic; they absorb nutrients from a symbiotic partner. Fungal Structure The thallus (body) of a mold or fungus consists of long filaments of cells joined together; these filaments are called hyphae. Hyphae Singular is hypha The basic structural unit of fungi These are nucleated tubular filaments Hyphae can be septate (having cross walls or sent to dividing the hyphae into cell-like units), or they can be coenocytic (hyphae that lack septa). When environmental conditions are suitable, the hyphae grow to form filaments this mass called a mycelium. Hyphae cell walls are composed of chitin. Fungal Systematics Classified based on the types of spores. Three Phyla (divisions) significant to medical microbiology 1. Zygomycota Conjugation fungi Molds with coenocytic hyphae Reproduce asexually by sporangiospores Reproduce sexually by producing zygospores For example Rhizopus (black bread mold) 2. Ascomycota Sack fungi Molds with septate hyphae and some yeasts Reproduce asexually by conida (asexual spores) Reproduce sexually by ascospores For example Penicillium, Aspergillus, ergot 3. Basidiomycota Club fungi Molds with septate hyphae that produce mushrooms Reproduce asexually by fragmentation Reproduce sexually by basidiospores produced on the gills of mushrooms Most of the structure of mushrooms is in the soil
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For example: 1) edible mushrooms 2) poisonous mushrooms 3) magic Yeasts Unicellular fungi Reproduce asexually by budding or fission For example Saccharomyces (Brewers yeast-alcohol, Baker's yeast-breads) For example Candida
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