A broth containing a mixture of three bacteria (Staphylococcus aureus, E. coli and
Pseudomonas aeruginosa)

Streak the mixed broth onto the following media.
• Nutrient agar (NA)
• MacConkey agar (MAC)
• Cetrimide agar (CET)



• Consistency
1. Butyrous (the consistency of butter)
2. Viscous (can be noticed by the growth trailing from the loop when withdrawn
from the plate)
3. Membranous (markedly thin)
4. Brittle (dry/friable)


• Optical Characteristics
1. Opaque (not permitting light to pass through the growth)
2. Translucent (some light passes through the growth)
3. Opalescent (opal/milky like in appearance)
4. Iridescent (exhibiting changing colours in reflected light, similar to a rainbow)
5. Dull (not glossy)
6. Glistening (glossy)
7. Rough
8. Smooth
9. Wrinkled
10. Dry


• Whole Colony Characteristics
1. Punctiform
2. Circular
3. Rhizoid
4. Irregular
5. Filamentous


• Colony Edge Characteristics
1. Entire
2. Undulate
3. Lobate
4. Filamentous
5. Curled


• Elevation Characteristics.
1. Flat
2. Raised
3. Convex
4. Pulvinate
5. Umbonate

السؤال اعتمادا على الجدول السابق ماهي البكتيريا التي ستنمو في كل اجار وكيف سيكون شكل المستعمرات


Thanx