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