Method of performing gradient-based assays in a microfluidic...

Chemistry: analytical and immunological testing – Automated chemical analysis – With a continuously flowing sample or carrier stream

Reexamination Certificate

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C436S053000, C436S172000, C436S177000, C436S180000, C422S081000, C422S082000, C422S082080, C422S105000

Reexamination Certificate

active

07112444

ABSTRACT:
A method is provided for performing a gradient-based assay in a microfluidic device. The method includes the steps of passing first and second fluids through a channel in the microfluidic device. The first fluid has a predetermined concentration of particles therein such that the particles in the first fluid diffuse into the second fluid so as to cause a gradient of concentration of particles in the second fluid as the second fluid flows through the channel. The second fluid sequentially intersects a series of targets along the channel wall as the second fluid flows through the channel.

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