| http://www.w3.org/ns/prov#value | - ction of the light beam with a substrate/channel interface and the sample, the backscattered light comprising interference fringe patterns including a plurality of spaced light bands whose positions shift in response to changes in the refractive index of the first sample; introducing a second sample comprising a mixture of the first non-immobilized analyte and a second non-immobilized analyte to b
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