The method involves {TAIL ~ 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 a site on a porous substrate surface 
The method involves { TAIL ~ 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 a site on a porous substrate surface
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