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We report the operation of a highly sensitive, tunable and stable RF interferometer, which is based on quadrature-hybrids. The interferometer is used to characterize and analyze DNA molecules, pBluescript (SK+) and pET21a, in ∼1 nL DI water solutions. The obtained RF sensitivity at ∼10 GHz is better than ∼3×10−15 mol/mL, which is close to the previously reported highest result. DNA molecular compositions...
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