21.1: Appendix A - Colony Morphology on Agar Plate Cultures
- Page ID
- 122927
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Colony Morphology: Form of Colony
Colony Morphology: Elevation of Colony
Colony Morphology: Margin of Colony
Colony Morphology: Surface of Colony
Colony Morphology: Pigmentation.
Pigments can be divided into two basic types: water insoluble and water soluble. If the pigment is water insoluble, as in the case of most chromogenic bacteria, it does not diffuse out of the organism. As a result, the colonies are pigmented but the agar remains the normal color. If the pigment is water soluble (as in the case of Pseudomonas aeruginosa) it will diffuse out of the organism into the surrounding medium. Both the colonies and the agar will appear pigmented.
State the color of the pigment (red, orange, green, etc.) and its solubility (water soluble or water insoluble).
Colony Morphology: Optical Characteristics
Opaque, transluscent, dull, mucoid, dry, etc.
Contributors and Attributions
Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)