L5.4 Proteobacteria_Gammaproteobacteria Flashcards
Describe the diversity of Gammaproteobacteria
-1500 species
-15 orfers
-largest class
-photo, chemoorgano, chemolitho
Metabolic profile of gammaproteobacteria
respiratory or fermentive metabolisms
What are the order under gammaproteobacteria
Enterobacteriales
Pseudomonadales
Vibrionales
What are the genera unde Enterobacteriales
Enterobacter
Escherichia
Klebsiella
Proteus
Salmonella
Serratia
Shigella
Profile of enterobacteriales
facultatively aerobic
Gram -
Non-sporulating bacteria
Nonmotile/petrichous flagella
Diagnostic tests for enterobacteriales
Oxidase -
Catalase +
Enterobacteriale metabolic characteristics
produce acid from glucose,
reduce nitrate to nitrite
ferment sugar
Identification challenges in Enterobacteriales
- genetic similarities
- requires genomic analysis
What are the fermentation patterns of enteric bacteria
Mixed-acid Fermentation
2,3-butanediol fermentation
Differntiate mixed-acid fermentation to 2,3-butanediol fermentation
Mixed-acid:
acids: acetic, lactic, succinic
products: ethanol, equal C02 and H2
2,3-butanediol fermentation
acids: small amount
products, butanediol, ethanol, more CO2 than H2
Mixed acid fermenters
Escherichia, Salmonella, Shigella, Citrobacter, Proteus, and Yersinia
Butanediol fermenters
Enterobacter, Klebsiella, Erwinia and Serratia
result of VP test among mixed-acid fermenters and butanediol fermentation
MAF- purple
BF - pink-red
Habitat and role of E.cpli
- intestinal tract of warm-blooded animals
-synthesize vit K
metabolic characterisitic of e.coli
minimal growth factor
grow variety of C as energy source