BIOL240 Lecture Notes - Lecture 10: Lactobacillales, Botulinum Toxin, Flaccid Paralysis
7 Jul 2017
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Document Summary
Firmicutes and actinobacteria are 2 bacterial classes with thick peptidoglycan walls. Gram positive but very different photogenically: firmicutes have low guanine-cytosine (gc) content (45-60%, aactinobacteria have high gc content (>60%) Micrococcus from the actinobacteria: high gc content. Inhabits skin surface, can distribute via dust particles: exposed to oxygen, dry, high salt. Lactococcus and lactobacillus help produce human food (cheese, kimchi,etc: lactic acid bacteria ferments in our mouths (why we brush/floss teeth, to keep them from eroding enamel) Clostridium; sporulating gram-positive rods that are (mostly) strict anaerobes: can ferment a wide range of different substrates (master fermenters) Mycobacterium avium: opportunistic pathogen, grown in lab with cord-like growth, waxy consistency (can burn easily like a candle) Antinomycetes (of acinomycetales) include all filamentous actinobacteria: not evolutionarily related to fungi, but highly filamentous and resembles fungi when grown on agar plates. Produces desiccation-resistant spores called conidia using sporophores, a special spore producing structure. Aerial hypha = structures that produce the spores.
