RESEARCH STRICKLER LAB
DAPHNIA

During the last weekend of April 2000, Paul Moore, Bowling Green State University, and two of his students, Mary Wolf and Robb Schneider, joined the team and brought with them an IVEC system.
In Vivo Electro Chemistry is a sensor system that allows us to measure chemical signals at the same spatial and temporal scales that animals perceive them. It measures organic molecules by performing very fast oxidation and reduction reactions at a microelectrode. More information can be found at the web page of the Laboratory for Sensory Ecology.

The IVEC electrode is the black stick on the left. On the right a micro- pipette delivers a mixture of two chemicals: Dextran (so we can see the flow of the solution with a Schlieren system) and Dopamine (the chemical IVEC senses).
The graph shows a 15 second trace of chemical fluctuations measured by the IVEC electrode. The fluctuations in concentration are a result of the chemical moving through the feeding mechanism of the Daphnia. It shows that even though it appears as if the animal beats regularly with its appendages, there is small scale variability in the movement.

IN VIVO ELECTRO CHEMISTRY
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