geotaxis of slime mold · 2014. 3. 17. · first...
TRANSCRIPT
Slime Mold
Koshi high school of Fukui Erina Morita Misako Kato
Yuina Tanikawa
First We found that slime mold may have
nega5ve geotaxis from the results of our
seniors’ experiment.
We want to research slime mold because
we were interested in it.
What is Slime mold?
True slime mold
Cellularity slime mold Cellular slime mold
Underside of roBen trees・logs
Fallen leaves
Slime mold
粘菌とは…? This is Slime mold!!
Figure Exploratory experiment
Outcome
90%
91%
92%
93%
94%
95%
96%
97%
98%
99%
100%
1day 2day 3day 4day 5day
Top
Bottom
Experiment Ⅰ:about Existence of geotaxis
Result 12.5% of slime molds showed that they didn’t have nega5ve gravitaxis.
87.5% of slime molds showed that they have nega5ve gravitaxis.
Considera5on
Slime molds mostly moved upward.
It is thought that they have nega5ve gravitaxis.
Experiment Ⅱ: About migra5on pathway
AQer 6 hours rotated 90 °or 180°
Result
Use bigger petri dish
Considera5on
It is thought that they have a property to avoid going over the same path.
They didn’t go over their path from before.
The Whole Considera5on
They leave the traces such as chemical substances on their path.
Avoid the path where they cannot expect to get food.
In doing so...
The difference in how the slime molds move may depend on the amount of food and the strength of s5mulus (gravity, light, and chemical substance).
Future Ques5ons What is the material leQ behind aQer the slime mold passes?
Why does the slime mold move to avoid it?
How does the slime mold move when signals (gravity, light, and chemical substance) are changed?
Thank you for
listening!!