Question
How can we observe Lactobacilli in buttermilk?
✓
Answer
- Smear a drop of fresh buttermilk on a glass slide.
- Stain it with methylene blue and put a coverslip over it.
- Observe the smear under the 10X objective of a compound microscope and then with the more powerful 60X objective.
- The blue rod-shaped organisms moving about are Lactobacilli.
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