MCB 3020C Lecture Notes - Lecture 22: Spiroplasma, Pseudomonadales, Vibrio Parahaemolyticus
Document Summary
Vibrionales: facultatively aerobic rods and curved rods that ferment, oxidase-positive, mostly aquatic, v. cholera causes cholera in humans, not other hosts, v. parahaemolyticus. Growth of mycoplasmas: small, pleomorphic cells, mycoplasma colonies show a characteristic fried-egg appearance, media for the culture of mycoplasmas are typically quite complex, energy metabolism varies. Spiroplasma: helical or spiral-shaped cells without cell wall and flagella, rotary (screw) or undulating motility. Isolated from ticks, hemolymph and guts of insects, vascular plant fluids and insects that feed on these fluids, and plant surfaces: cause some plant and insect diseases. Rod-shaped to filamentous, usually aerobic inhabitants of soil and plant materials. Valuable for antibiotics and certain fermented dairy products. Mostly harmless commensals with exception of mycobacterium. Mycobacterium tuberculosis: form tight, compact, wrinkled colonies, virulence of mycobacterium tuberculosis correlated to cordlike structure, cordlike structure related to cord factor glycolipid on cell surface.
