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level: Gram-negative aerobes

Questions and Answers List

level questions: Gram-negative aerobes

QuestionAnswer
Pseudomonas- gram-negative aerobes - motile rods; polar flagella - psychrotrophic - found widely in environment - spoil refrigerated fresh meats and vegetables
Xanthomonas- gram-negative aerobes - motile rods, polar flagellum - plant pathogens - spoil fruits and vegetables - pseudoplastic
Xanthomonas examples- Xanthomonas campestris produce xanthan gum - Xanthomonas axonopus: black spots on mangoes - Xanthomonas spp
Acetobacter- gram-negative aerobes - motile or non-motile rods - mesophilic - widely distributed in plants - spoil alcoholic beverages and fruit juices
Acetobacter examples- Acetobacter aceti oxidizes ethanol to acetic acid
Alcaligenes- gram-negative aerobes - motile; 4 to 8 peritrichous flagella - rods or coccobacilli - mesophilic; optimum growth at 20-37 C - present in water, soil, fecal material - spoil protein rich foods (milk, poultry, red meats)
Alteromonas- gram-negative aerobes - motile rods - strict aerobe - psychrotrophic - found in marine and coastal waters - need 100mM NaCl for growth - spoil fish and other meats
Flavobacterium- gram-negative aerobes - nonmotile rods - yellow to red pigments on agar medi - some mesotrophs, other are psychrotrophs - spoil refrigerated meats, milk, other protein foods
Acinetobacter- gram-negative aerobes - motile rods - spoilage - strict aerobes - twitching motility - widely distributed in soils and water - psychrotrophic
Psychrobacter- gram-negative aerobes - non-motile coccobacilli, usually in pairs - psychrotrophic - growth at 5 C, optimal 20 C, no growth at 35 C - spoil fish, red meats, and poultry products
Brucella- gram-negative aerobes - non motile coccobacilli - mostly single - mesophilic, optimal growth at 37 C - different species cause disease in animals and human pathogens - implicated in foodborne brucellosis
Campylobacter- gram-negative aerobes - spirally curved rods, motile - single polar flagellum (1 or 2) - microaerophilic - in intestinal tract of humans, animals, birds - typ with unpasteurized milk, undercooked poultry food disease outbreaks