{TAIL ~ Microbes} may obtain {HEAD ~ energy} from a feedstock or material through a metabolic process 
{ TAIL ~ Microbes } may obtain { HEAD ~ energy } from a feedstock or material through a metabolic process
TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH