Team:SSHS-Shenzhen/Model

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Model

Abstract

Our model is formalized by the Differential Equation: (Logistic Regression)

The Logistic Regression (or the Logistic Model) is a model that is greatly practiced in the field of epidemics. In this case, we chose this model to figure out the relationship between GC content and RNAi efficiency. Instead of guessing a linear function between the two, the Logistic Model helps us to develop a better understanding of this critical parameter which isn't backed by scientific theories.

Assumptions

The model works under the below assumptions:

1. Births and natural deaths are neglected
2. The beetles cannot recover either by itself or with the help of the leaves
3. Other factors do not change throughout the experiment

Parameters

Parameters	Meaning
D(t)	Number of deaths
η	RNAi efficiency
α	GC content

Experiments

Day 1 (8 of August, 2018)

This is our first bug killing experiment, we prepared our equipment. We put farmed Phyllotreta striolata Fabricius in bottles and make sure each bottle contains 20-25 Phyllotreta striolata Fabricius. We used gauze to cover the top of bottles(gauze can allow bugs to breath but they can’t escape). Then made spray with shRNA (1µL/mL), spray it on the leaves and put the leaves inside the bottles.

Summary:
1. Put Phyllotreta striolata Fabricius in bottles(20/bottle)
2. Made spray and spray it on the leaves
3. Put leaves into the bottel

Day 2 (10 of August, 2018)

Summary:
1. Clean out the leaves from the day before
2. Configure new shRNA spray(1µL/mL)
3. Replace each bottle with 2 leaves soaked in the corresponding reagent
4. Clean out the test bench.

Day 3 (13 of August, 2018)

This is our third bug killing experiment. We configurated new shRNA spray(1µL/mL). Then spray the spray on the new leaves, take out the old leaves and replace them with new leaves. At the same time, we pick out the dead Phyllotreta striolata Fabricius and put them in tubes for RT-PCR testing.

Summary:
1. Make new spray(1µL/mL). Spray the spray on new leaves
2. Take out the old leaves and replace them with new leaves
3. Pick out the dead Phyllotreta striolata Fabricius and put them in tubes

Day 4 (15 of August, 2018)

This is our forth experiment. Like the last experiment, we made new spray and replace the old leaves with new leaves which are sprayed. And then pick out dead Phyllotreta striolata Fabricius and put them in tubes.

Summary:
1. Make new spray(1µL/mL) and spray it on new leaves
2. Take out the old leaves and replace them with new leaves
3. Pick out the dead Phyllotreta striolata Fabricius and put them in tubes

Day 5 (17 of August, 2018)

This is our forth bug killing experiment, and also is our last bug killing experiment.

Summary:
1. Take out the dead bugs in the bottle, and take out the leaves in each bottle without putting new leaves
2. Record the number of deaths per bottle of bugs
3. The living bugs stay in the bottle and let them starve to death

Results

Raw data from the experiments