Measuring efficiency of bioluminescent bacteria

AI Thread Summary
The discussion focuses on measuring the efficiency of bioluminescent bacteria (V. Fischeri) in converting energy to light, comparing it to traditional light sources like LEDs and incandescent bulbs. To determine the efficiency of the bacteria, one approach suggested is to measure the energy consumed by the bacteria in both dark and light states to isolate the energy used for light production. Additionally, measuring the radiated power and spectral intensity can help calculate the efficiency. A proposed method for measuring energy consumption involves using a calorimeter to assess heat production, although this presents challenges in measurement accuracy. Overall, the conversation highlights the complexities of quantifying bioluminescent efficiency and the need for precise experimental methods.
BritKnight
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Hi,

I want to run an experiment to try and experimentally determine the efficiency (as in what percent of energy is converted to light) of bioluminescent bacteria (V. Fischeri), and compare it to the efficiency of a "traditional" light source, like an LED or an incandescent.

I know how I would determine the efficiency of an electrical source (measure the temperature of the source, turn it on, measure the temperature again after a set time, and use a couple of equations to determine energy lost as heat over energy consumed), but I am stuck on how I would measure the efficiency of a bacteria culture. The same temperature idea might work to determine the waste heat, but how would I find total energy consumed (or energy emitted as light)?

Any ideas would be appreciated!

Thanks, Charles
 
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Interesting question.

If you can measure the energy consumed by the bacteria both when they are 'dark' and when they are 'light', you know how much energy is being used to generate light (as opposed to overall metabolic expenditures). Then, if you measure the radiated power (you would need to measure the spectral intensity), you have the efficiency.

But- how to measure the energy consumed? I guess you could culture the bacteria in a calorimeter and measure the heat:

http://aem.asm.org/content/44/5/1102
http://en.wikipedia.org/wiki/Isothermal_microcalorimetry

Tricky measurement!
 
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