culture characteristic of bacteria
TRANSCRIPT
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Culture characteristic of bacteria
Prepared bySamira Fattah
Assis. Lec.College of health sciences-HMU
Lab 6
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• Bacteria grow on solid media as colonies.• A colony is defined as a visible mass of
microorganisms all originating from a single mother cell.
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Colony Morphology• These characters used to accurately describe the morphology
of a bacterial colony:-Size-Shape-Color (also known as pigmentation)-Texture-Height (elevation)-Edge (margin)
• Key features of bacterial colonies are important criteria for their identification.
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COLONY CHARACTER ON AGAR PLATE
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• Colony shape on agar plates
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Rhizoid
Circular Pinpoint
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• Margin of bacterial colony
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Undulate filamentous
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• Elevation of bacterial colony
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Raised marginUmbonate
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• Size of the bacterial colony
• Small• Medium• large
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• Texture of bacterial colony
• Dry• Moist• Viscid (stick to loop)• Mucoid (mucus-like)
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• Colour of the colonies (pigmentation) Some bacteria produce pigment when they grow in the
medium.
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• Opacity of the bacterial colony
• Opaque (not clear)
• Translucent (clear)
• Iridescent(shine)
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COLONY CHARACTER ON AGAR SLANT
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• Growth on agar slants
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beadedFiliform
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GROWTH IN NUTRIENT BROTH
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• Growth in nutrient broth
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LAB EXERCISE
-Student will identify the growth patterns on the nutrient agar plates and slants, and in the nutrient broth tubes.