The method involves the application of focused acoustic energy to each of a plurality of fluid containing reservoirs to eject a small fluid droplet on the order of 1 picoliter or less from {HEAD ~ each reservoir} to {TAIL ~ a site} on a porous substrate surface 
to
The method involves the application of focused acoustic energy to each of a plurality of fluid containing reservoirs to eject a small fluid droplet on the order of 1 picoliter or less from { HEAD ~ each reservoir } to { TAIL ~ a site } on a porous substrate surface
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