IGEM:IMPERIAL/2008/Prototype/Drylab/Motility data collection

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Home The Project B.subtilis Chassis Wet Lab Dry Lab Notebook


Motility Data Acquisition

Using manual tracking we hope to acquire sufficient data to obtain B. Subtilis motility properties such as run velocity, run duration, tumbling angle and tumbling duration. This is done by first tracking cells and obtaining coordinate points, and from these points extracting out the above mentioned motility characteristics. The next phase would be to study the statistical distribution of these various properties, and compare them to our own statistical models of B.Subtilis motility. Our approach to collecting motility data is shown in the figure below:

Approach to Motility Data Collection
Approach to Motility Data Collection
Materials

We will be using the Zeiss Axiovert 200 inverted microscope with a fully motorised stage, controlled by Improvision Volocity acquisition software. This system offers a full incubation chamber with temperature and CO2 control, a large range of filter sets from UV to far-red and a highly sensitive 1300x1000 pixel camera for fast low-light imaging. Video images are captured into memory by the system at a basal video frame rate of 16.3Hz. This can be further increased by performing binning.

Method

It was concluded from the validation of tracking software that manual tracking provides for the most reliable form of tracking. We intend to use manual tracking to track B.Subtilis and extract two-dimensional coordinate data points which is described by the trajectory of the cells.

Data Extraction

After obtaining the coordinate points described by bacteria trajectory, we will input this data into algorithms to extract motility properties such as run velocity, run duration, tumbling angle and tumbling duration. As we are extracting data from digitised images, the error associated with our data extraction algorithm will also be assessed using synthetic videos. Once motility data extraction is complete, we may go on to model the motility of B.Subtilis.




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