Gram-negative aerobe 🎯

Question 1

▪ rod-shaped, motile, aerobic mesophile that oxidize ethanol to acetic acid 🍷
▪ cause souring of alcoholic beverages and fruit juices 🍻🧃
▪ used to produce vinegar 🫙

Answer 1

Acetobacter aceti

Question 2

▪ rod-shaped
▪ occur in pairs or small chains
▪ show twitching motility because of the presence of polar fimbriae
▪ strictly aerobic and grow between 20°C and 35°C
▪ found in soil, water, sewage 🕳️🛢🚰

Answer 2

Acinetobacter calcoaceticus

Question 3

▪ spoilage of protein-rich foods 🍖🍗
▪ rods or coccobacilli
▪ motile
▪ present in water, soil, or fecal material 🕳️🚰🚽
▪ mesophiles

Answer 3

Alcaligenes faecalis

Question 4

▪ marine origin and might be present in foods of marine origin 🍤🦪
▪ psychrotrophs
▪ need 100 mM NaCl for optimum growth 🧂
▪ important in fish and meat spoilage

Answer 4

Alteromonas putrefaciens

Question 5

▪ coccobacilli
▪ mostly single, non-motile
▪ causes diseases 🐮🐷🐑 in cattle, pigs, and sheep
▪ implicated in foodborne brucellosis
▪ causes abortion in cows 🐄

Answer 5

Brucella abortus

Question 6

▪ small microaerophilic, helical, motile cells
▪ mesophiles
▪ found in the intestinal tract of humans, animals, and birds 👩‍💼🐥🐻

Answer 6

Campylobacter jejuni & coli

Question 7

▪ rods, non-motile psychrotrophs
▪ appear in colored colonies 🟠🟡
▪ cause spoilage of milk, meat, and other protein foods 🍖

Answer 7

Flavobacterium aquatile

Question 8

▪causes spoilage of 🍍🍐🍎 pineapples, apples, and pears

Answer 8

Gluconobacter oxydans

Question 9

▪ very short rods
▪ occur singly, in pairs or short chains
▪ may be capsulated
▪ twitching motility
▪ optimum growth at 30°C to 35°C
▪ found in mucous membrane of animals and humans 👃

Answer 9

Moraxella lacunata

Question 10

▪ straight or curved motile, psychrotrophic rods
▪ important spoilage bacteria in variety of 🍞🍳🍖 carbohydrates, proteins, and lipids foods

Answer 10

Pseudomonas flurescens, aeruginosa, putida

Question 11

▪ coccobacilli
▪ non-motile
▪ can grow at 5°C or below
▪ optimum growth at 20°C and unable to grow at 35°C
▪ found in fish, meat, and poultry products 🐟🍖🥚

Answer 11

Psychrobacter immobilis

Question 12

▪ plant pathogens 🌱
▪ cause spoilage of fruits and vegetables 🍎🫑
▪ used to produce xanthan gum, a food stabilizer 💪

Answer 12

Xanthomonas campestris