gram negative bacteria - ju medicine · lactose fermenter o swarming motility ( flagellated ) ......
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![Page 1: Gram Negative Bacteria - JU Medicine · lactose fermenter o Swarming motility ( flagellated ) ... Pseudomonas aeruginosa Most isolated q specie non lactose fermentas r Very special](https://reader034.vdocument.in/reader034/viewer/2022052520/60850c3a6927a134776abcdd/html5/thumbnails/1.jpg)
Gram Negative Bacteria
selective forisolation Macconkey Enterobacteriaceae Gram0
Agar differentialis
lactose non lactosefermentas fermentas
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(E.coli)1. Escherichia coli
Mostcommon typelactose tNo specific character DrycolonyRods
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2. Klebsiella
• Large mucoid polysaccharide capsule .
weakor lateqlactose fermentas
Give Mucoid colonybecause it is encapsulated
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3. EnterobacterNo specificcharacterSimilar to Ecoli
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4. Citrobacter
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o Gram negative rods , nonlactose fermenter
o Swarming motility ( flagellated )
o Prevent swarming by culturingit on CLED or Macconkey media
Proteus
e
pedal
spread inthe Media
used More 4than Macc
I l I d
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identified by :•Gram negative rods•odor : grape-like smell.•Oxidase positive.•Produce different pigments colors:
• Pyocyanine (blue-green)• Pyoverdin (fluorescent yellow –greenish
pigment).• Pyorubrin (red).• Pyomelanin (brown).
Pseudomonas aeruginosaMost isolated qspecie
non lactosefermentas
r Veryspecialcharacter
Gives violet color
IThe color depend on the type ofPigment produced
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Pseudomonas aeruginosa on mueller hintion agar
gm 1 Pr
TheTediatakesthecolor of the pigment
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