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"The Battle to Secure a 'Good Bug' Habitat" (Using Yogurt Cultures to Simulate Bifidobacterium Animals)
2025-10-22
This experiment simulates the "competitive inhibition" effect of probiotics—how beneficial bacteria outcompete harmful ones by seizing resources, thereby suppressing their growth.
• Exploration objective: Understand how probiotics (such as Bifidobacterium animalis) protect the gut.
• Safe materials: two small bowls, milk, commercially available yogurt (containing live cultures), and a pinch of moldy food (such as moldy bread—note: observe only; do not touch!)
• Steps:
1. Bowl A (with protection): Add yogurt to the milk and stir thoroughly.
2. Bowl B (No Guard): Pour in pure milk only.
3. Place an extremely small piece of mold in each of the two bowls, and seal them tightly with plastic wrap.
4. Place it in a warm location and observe for 2-3 days.
• You will see:
• Bowl B (Unprotected): Mold grows rapidly, potentially turning green or black, and causing milk to spoil.
• Bowl A (with protection): Yogurt cultures (such as lactic acid bacteria and Bifidobacteria) primarily ferment milk, turning it sour and causing it to solidify into yogurt, while mold growth is significantly inhibited.
• Scientific principle: This simulates the role of beneficial probiotics, such as Bifidobacterium, in the gut. By rapidly multiplying, producing acid (lactic acid), and occupying space and nutrients, they effectively inhibit the growth of harmful bacteria like E. coli and Staphylococcus aureus. This is known as the "space-occupancy effect."
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