Use of Colonial Morphology for the Presumptive Identification of Microorganisms, Haemophilus, atlas in medical, atlas in microbiology, tuyenlab.net,
|Fig 2. A, Example of lactose-fermenting gram-negative rods producing pink|
colonies on MacConkey agar (MAC). B, Example of nonlactose-fermenting gram-negative
rods producing colorless colonies on MAC.
| Fig 5. The use of transillumination to determine|
whether the colonies are hemolytic. The technique can be
used for MacConkey agar also to see slight color differences
in nonlactose fermenters.
|Fig 6. Chocolate agar (CHOC) does not display true|
hemolysis because the red cells in the medium have already
been lysed. Bacteria that are hemolytic on blood agar plate
usually are green around the colony on CHOC.
|Fig 7. Left, Blood agar plate (BAP): small white|
colonies are gram-positive cocci; right, BAP: large, gray,
mucoid colonies are enteric gram-negative rods.
|Fig 8. Illustration of form or margin to describe|
|Fig 9. Swarming colonies of Proteus spp. The organism|
was inoculated in the middle of the blood agar plate
|Fig 10. “Diphtheroid” colonies with rough edges, dry|
appearance, and umbonate center growing on blood agar.
|Fig 11. Illustration of elevations to describe colonial|
|Fig 12. Density.|
|Fig 13. Example of white colonies of coagulasenegative staphylococci on blood agar.|
|Fig 14. Example of the yellow colonies characteristic|
of certain nonpathogenic species of Neisseria organisms on
|Fig 15. A, Pseudomonas aeruginosa illustrating the|
metallic sheen and green pigmentation of colonies on blood
agar plate (BAP). B, Not all strains of the same organism
have the same colonial appearance. This is a mucoid strain
of P. aeruginosa on BAP.
|Fig 17. Large, rough, greenish-appearing, hemolytic|
colonies of Bacillus cereus on blood agar plate.
|Fig 18. Small, “fuzzy-edged,” umbonate centerappearing colony of Eikenella corrodens on chocolate agar. This organism has the tendency to “pit” the agar.|
|Fig 20. Turbidity produced by enterics when growing|
in thioglycollate. Notice the gas bubbles at the surface of
and in the middle of the medium (arrow).
|Fig 21. Production of “scum” by yeast at the surface|
of the thioglycollate.
|Fig 22. Illustration of Pseudomonas organisms|
producing surface “scum” at the sides of the thioglycollate.
Occasionally Pseudomonas aeruginosa produces a diffusible
green pigment and a metallic sheen at the surface.
|Fig 23. Yeast growing in the microaerophilic area of|
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