Eukaryotic Microbes

Eukaryotic Microbes - MICROBIOLOGY LECTURES Eukaryotic...

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01/18/12 1 Eukaryotic Microbes MICROBIOLOGY LECTURES Sofronio Agustin Professor
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01/18/12 2 Lesson Objectives: At the end of the lesson, the students should be able to: Describe the biology of medically important eukaryotic microbes. Describe the human diseases associated with these microbes including their diagnosis, treatment and prevention. Describe the laboratory procedures used to recover, study and identify these microbes.
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01/18/12 3 FUNGI Mycology - study of the multicellular fungi and yeasts. Fungi are aerobic to facultatively anaerobic organisms that grow best in sugar rich and acidic medium such as Sabouraud Dextrose Agar (SDA). Many are saprophytic (live on decaying and dead tissues) and some are decomposers (food spoilage). Out of 50,000 known species, only 100-150 are medically important.
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01/18/12 4 Zygomycetes Characterized by having aseptate hyphae, asexual sporangiospores contained in bag like sporangium and sexual zygospores. Rhizopus nigricans a black mold growing on stale bread and cereal.
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01/18/12 5 Ascomycetes Characterized by having septate hyphae, asexual conidiospores borne on flasklike structures called phialides and sexual ascospores contained in saclike ascus. Aspergillus fumigatus a blue green mold ; frequent contaminant in the microbiology laboratory.
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01/18/12 6 Basidiomycetes Characterized by having septate hyphae, asexual conidiospores and sometimes assumes yeast forms and sexual basidiospores borne on clublike basidium. Cryptococcus neoformans a capsulated yeast causing fungal meningitis.
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01/18/12 7 Deuteromycetes Lack sexual stage but produce several forms of asexual spores. Also called “Fungi Imperfecti. Most pathogenic fungi belong to this group.
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01/18/12 8 Yeasts Unicellular fungi Reproduce by budding Produces pasty or mealy bacterialike colonies on SDA. Cell walls are rich in mannan and glucan.
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01/18/12 9 Medically Important Yeasts Germ tube production in plasma is diagnostic Candida albicans Characteristically produces pseudohyphae and thick- walled chlamydospores .
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01/18/12 10 Medically Important Yeasts Encapsulated Yeast stained with India Ink Cryptococcus neoformans Characteristically produces positive urease test .
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11 Molds The fungal thallus consists of hyphae. A mass of hyphae is a
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This note was uploaded on 01/18/2012 for the course MCB 2010C taught by Professor Sofronioagustin during the Fall '06 term at Valencia.

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Eukaryotic Microbes - MICROBIOLOGY LECTURES Eukaryotic...

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