Gram ‐ Negative Rods and Cocci Bdellovibrios. Bdellovibrios are aerobic Gram-negative, curved rods that prey on other bacteria. The organism attaches to the surface of a bacterium, rotates, and bores a hole through the host cell wall. It then takes biochemical control of the host cell and grows in the space between the cell wall and plasma membrane. The host bacterium is killed in the process. The comma-shaped Bdellovibrio bacteriovorus is the most thoroughly studied species of the group. Pseudomonads. Pseudomonads are aerobic, Gram-negative rods that are motile with polar flagella. Over 30 species are found in the group, and Pseudomonas fluorescens is a well-known producer of a yellow-green pigment. Another species, P. aeruginosa , causes urinary tract infections and infections of burned tissue. Azotobacter and Rhizobium . Species of
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This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.