The method involves the application of focused acoustic energy to each of a plurality of {TAIL ~ fluid containing reservoirs} to eject {HEAD ~ 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 the application of focused acoustic energy to each of a plurality of { TAIL ~ fluid containing reservoirs } to eject { HEAD ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH