Fungi notes - Fungi Multicellular filamentous organisms...

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Fungi Yeasts Mold Multicellular filamentous organisms forming hyphae. Ex: Mildew Unicellular budding organisms. Multicellular filamentous organisms forming hyphae. Ex: mildew Chemoheterotrophs Chemoheterotrophs Chemoheterotrophs Most are aerobic or facultatively anaerobic. Very few are anaerobic. Most are aerobic or facultatively anaerobic. Very few are anaerobic. Most are aerobic or facultatively anaerobic. Very few are anaerobic. Most are saprophytic in soil and water. Most are saprophytic in soil and water. Most are saprophytic in soil and water. Eukaryotic organisms Eucaryotic organisms Eucaryotic organisms. Often identified on physical appearance of colony and microscopic appearance spores. Vegetative : cells with catabolism and growth. o Vegetative hyphae growing in culture media or woodlog Spores can be asexual or sexual . o Spores are generate by meiosis Cell membrane: contain sterols . (steroid alcohol, in humans these clumps are cholesterol) o Ergosterol in fungi. o There are drugs that are ergosterol suppressant. Cells walls contain glucans, mannans, chitin (no peptidoglycan) o Chitin is made out of poly-n-acetylglucosamine o Nikkomycin is an chitin inhibitor o Chitin can be found on cytoskeleton of a cockroaches or crab. Nutritional Adaptations of Fungi Often grow where bacteria don’t grow. Fungi prefer pH 5.0, at which most bacteria do not grow. o Bacteria normally grow on higher pH. o Normal human pH is 7.4 o A patient is acidosis when their pH is 7.2 Since they are aerobic, they often grow on surfaces. Can survive in high concentration of sugar or salt. Can grow on low moisture. Require less nitrogen than bacteria Can metabolize complex carbohydrate like wood, whereas most bacteria cannot. o Therefore: growth on painted walls, shoe leather, discarded newspapers = mildew.
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Fungi Eukaryotes Mycology: Fungi, yeasts, molds Chemoheterotrophs: need organic “food” Usually aerobic or acultative anaerobic Soil and water saprophytes: decompose plant materials. 100 of 100,000 species are human pathogens Thousands cause plant disease. Thallus Body of fungus or molds The thallus of a fungus is usually called a mycelium (long filamentous hyphae). Includes filaments of hyphae made up of cells, each with nucleus. Reproduce by elongation at tip usually with cross-walls → septate hyphae If no septa coenocytic hyphae (non-septate hyphae) Waronin body – a rounded organelle occurring near the septa in at least some Ascomycetes or Deuteromycetes. o
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This note was uploaded on 02/05/2009 for the course MIBO 4700 taught by Professor Langford during the Spring '08 term at University of Georgia Athens.

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Fungi notes - Fungi Multicellular filamentous organisms...

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