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level: Gram positive, rod shaped bacteria

Questions and Answers List

level questions: Gram positive, rod shaped bacteria

QuestionAnswer
Bacillus- gram positive, rod-shaped bacteria - straight cells; motile or nonmotile - aerobic or facultatively anaerobic - most are mesophiles - one endospore per cell; spores very heat resistant
Bacillus examples- Bacillus cereus and B. anthracis: pathogens - some B. cereus are psychotrophic, can grow at fridge temps - B. coagulans and B. stearothermophilus: cause food spoilage in canned foods - B. subtilis: produce enzymes for food bioprocessing (ex. amylase for starch degradation)
Alicyclobacillus- gram positive, rod-shaped bacteria - forms spores - non-motile, strictly aerobic - isolated from soil, acidic, juices, orchards, and juice production equipment - spoils fruit juices
Alicyclobacillus exampleAlicyclobacillus acidoterrestris - thermo-acidophilic - growth temp: 20-55 C - pH range: 2-6
Clostridium- gram positive, rod-shaped bacteria - motile or non motile rods - anaerobic: some species very oxygen sensitive - thermophilic, mesophilic, and psychrotrophic strains - endospore formed at one end of cell - in soil, marine sediments, sewage, decaying vegetation, animal and plant products
Clostridium examples- foodborne pathogens: Clostridium botulinum, C. perfringens - food spoilage organsims: C. saccharolyticum, C. tyrobutyricum, C. laramine