Patent Number: 
Section: claims

1. A method for reacting a suitable sample and reagent pair by use of a sample manipulator comprising (i) a substrate, and (ii) a plurality of traveling wave electrodes disposed on the substrate, the method comprising:depositing the sample at a first location on the sample manipulator;depositing the reagent at a second location on the sample manipulator;determining a suitable frequency for a voltage waveform to be applied to the electrodes of the sample manipulator; andapplying the voltage waveform at the determined frequency to the sample manipulator to thereby cause electrostatic traveling waves to move at least one of the sample and the reagent into contact with the other and thereby enable reaction therebetween. 2. The method of claim 1 wherein the sample is tagged with a fluorochrome immobilized on the substrate, and the reagent is tagged with a second fluorochrome that is able to generate fluorescence resonance energy transfer (FRET) effects. 3. The method of claim 2 wherein the reagent is moved to close proximity and then moved away from the sample by traveling waves on the sample manipulator to determine whether fluorescence resonance energy transfer (FRET) effect has occurred between the two. 4. The method of claim 1 wherein two different types of molecules are moved simultaneously by traveling waves to close proximity of a third immobilized molecule whereas all three are required to interact and produce signals.