{HEAD ~ 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 {TAIL ~ 1 picoliter} or less from each reservoir to a site on a porous substrate surface 
{ HEAD ~ 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 { TAIL ~ 1 picoliter } or less from each reservoir to a site on a porous substrate surface
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 OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH