The device includes a fluid channel having a surface and an object such as {HEAD ~ a bacterium} or {TAIL ~ virus} may flow through the fluid channel 
The device includes a fluid channel having a surface and an object such as { HEAD ~ a bacterium } or { TAIL ~ virus } may flow through the fluid channel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH