The document summarizes research into how polyps distinguish food from non-food items. It describes experiments exposing polyps to peptone and glucose solutions to see how they react. The results showed polyps reacted more to peptone, indicating they can distinguish food by detecting certain amino acids. However, the experiments did not determine if only one key amino acid triggers feeding. Future work is needed to expose polyps to individual amino acids to identify which ones trigger their feeding response.
3. Introduction Method Results Discussion
Polyp
• A form of jellyfish mouth
• Attach to something solid
• Eat planktons
arm
4.
5. Introduction Method Results Discussion
How do polyps distinguish food from
uneatable things?
Previous research： Cordylophora
distinguish food by particular
amino acid
→ Do polyps really distinguish
food only by amino acid?
6. Introduction Method Results Discussion
1. Do polyps really distinguish
food only by amino acid?
• Peptone : fragment of protein
• Glucose : sugar
→Expose to 20 polyps
7. Introduction Method Results Discussion
Reactions of polyps
25
The number of polyps reacted
20
15
peptone
10
glucose
5
0
1.0×10⁻² 1.0×10⁻³ 1.0×10⁻´
Concentration of each solution（ g/L）
8. Introduction Method Results Discussion
How do polyps distinguish food from
uneatable things?
Do polyps really distinguish food
only by amino acid?
→ Yes.
Amino acid sugar
Is the key amino acid only one
kind?
9. Introduction Method Results Discussion
Is the key amino acid only one kind?
・Fermentum http://blog.livedoor.jp/keloinwell/archives/1413914.html
・Peptone(from Experiment1)
→Expose to 20 polyps
10. Introduction Method Results Discussion
Reactions of polyps
25
The number of polyps reacted
20
15 peptone
fermentum
10
5
0
1.0×10⁻² 1.0×10⁻³ 1.0×10⁻´
Concentration of each solution
（ g/L）
11. Introduction Method Results Discussion
The trigger of feeding
• Aurelia → Certain kinds of amino acid
12. Introduction Method Results Discussion
Conclusion
• Amino acid is the trigger of polyp’s feeding
• Certain kinds of amino acids trigger the
feeding of Aurelia polyps
• Could not answer 2nd question
” Is the key amino acid only one kind?”
13. Introduction Method Results Discussion
Future Work
• Expose polyps to each kind of amino
acid
↓
Determine the amino acids trigger
polyp’s feeding
