Gliding bacteria Fruiting body formation in Chondromyces crocatus Early stage Three stages in head formation Stalk formation Mature fruiting bodies
Gliding Bacteria Fruiting body formation in Chondromyces crocatus Early stage Stalk formation Three stages in head formation Mature fruiting bodies
Sheathed bacteria Filamentous organisms with a unique life cycle involving formation of flagellated swarmer cells within a long tube or sheath Under unfavorable conditions, the swarmer cells move out and become dispersed to new environments, leaving behind the empty sheath Active growth stage Sphaerotilus natans Swarmer cell Swarmer cells leaving the sheath
Sheathed Bacteria Filamentous organisms with a unique life cycle involving formation of flagellated swarmer cells within a long tube or sheath Under unfavorable conditions, the swarmer cells move out and become dispersed to new environments, leaving behind the empty sheath Sphaerotilus natans Active growth stage Swarmer cells leaving the sheath Swarmer cell
Pseudomonads Purple bacteria(Proteobacteria), gram-negative Polar flagella, aerobic, grow at neutral pH mesophilically Chemoorganotrophic, never show a fermentative metabolism P aeruginosa is opportunistic pathogen, some are plant pathogens Pseudomonas have broad substrate utilization, some produce polyhydroxy- butyrate and some synthesize medium- chain-length polyhydroxyalkanoates have been studied in our lab
Pseudomonads Purple bacteria (Proteobacteria), gram-negative Polar flagella, aerobic, grow at neutral pH mesophilically Chemoorganotrophic, never show a fermentative metabolism P. aeruginosa is opportunistic pathogen, some are plant pathogens Pseudomonas have broad substrate utilization, some produce polyhydroxybutyrate and some synthesize mediumchain-length polyhydroxyalkanoates, have been studied in our lab
Glucose The Entner-Doudoroff pathway ATP the major means of glucose catabolism Glucose 6-phosphate in pseudomonads COOH H-C-OH HO-C-H 6-Phosphogluconic OH H一 2C-P COOH 2-Keto-3- H-C-H deoxygluconic acid 6-phosphate (KDGP) H-C-OH H2 COOH Glyceraldehyde Pyruvate C-O 3-phosphate 2C-P (c) Pyruvate
The Entner-Doudoroff pathway, the major means of glucose catabolism in pseudomonads
Free-Living Aerobic Nitrogen-Fixing Bacteria Large, gram-negative, obligately aerobic rods, capable of fixing N2 nonsymbiotically Azotobacter has the highest respiratory rate of any living organism(purple bacteria) Azotobacter cells are very large, almost the size of yeasts, produce cysts ysts Azotobacter cysts have low endogenous respiration and are resistant to desiccation mechanical disintegration, and UV as well as ionizing radiation however, they are not especially heat-resistant vegatative cells of Azotobacter vinelandii
Free-Living Aerobic Nitrogen-Fixing Bacteria Large, gram-negative, obligately aerobic rods, capable of fixing N2 nonsymbiotically Azotobacter has the highest respiratory rate of any living organism (purple bacteria) Azotobacter cells are very large, almost the size of yeasts, produce cysts Vegatative cells of Azotobacter vinelandii Cysts Azotobacter cysts have low endogenous respiration and are resistant to desiccation, mechanical disintegration, and UV as well as ionizing radiation however, they are not especially heat-resistant