![Page 1: Geotaxis of Slime Mold · 2014. 3. 17. · First We(found(thatslime(mold(may(have(negave(geotaxis(from((the(results(of(our(seniors’(experiment.(We(wantto(research(slime(mold(because(we(were(interested(in(it](https://reader035.vdocument.in/reader035/viewer/2022071412/6109818218a1ac01ab677756/html5/thumbnails/1.jpg)
Slime Mold
Koshi high school of Fukui Erina Morita Misako Kato
Yuina Tanikawa
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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.
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What is Slime mold?
True slime mold
Cellularity slime mold Cellular slime mold
Underside of roBen trees・logs
Fallen leaves
Slime mold
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粘菌とは…? This is Slime mold!!
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Figure Exploratory experiment
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Outcome
90%
91%
92%
93%
94%
95%
96%
97%
98%
99%
100%
1day 2day 3day 4day 5day
Top
Bottom
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Experiment Ⅰ:about Existence of geotaxis
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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.
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Considera5on
Slime molds mostly moved upward.
It is thought that they have nega5ve gravitaxis.
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Experiment Ⅱ: About migra5on pathway
AQer 6 hours rotated 90 °or 180°
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Result
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Use bigger petri dish
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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.
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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...
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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).
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Future Ques5ons What is the material leQ behind aQer the slime mold passes?
Why does the slime mold move to avoid it?
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How does the slime mold move when signals (gravity, light, and chemical substance) are changed?
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Thank you for
listening!!