Figure 13

Microscopic view (4x inverted microscope phase and green filter) of DEP microelectrode array using higher frequencies to capture smaller nucleated cells (red circles) 25–40 microns in size within a high debris clinical sample. Darker striped regions are the electrode domains (approximately 50 microns) whereas the lighter striped regions are the gap space (approximately 100 microns). The direction of flow (black arrow) causes some captured cells to be displaced to the trailing edge of the DEP field.