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