The method involves {HEAD ~ the application} of {TAIL ~ 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 each reservoir to a site on a porous substrate surface 
The method involves { HEAD ~ the application } of { TAIL ~ 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 each reservoir to a site on a porous substrate surface
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH