 Various attempts have been made by engineers to mimic the process of facilitated transport in synthetic (i.e., non-biological) membranes for use in industrial-scale gas and liquid separations, but these have met with limited success to date, most often for reasons related to poor carrier stability and/or dissociation of the carrier from the passive transport.In living organisms, the main physical and biochemical processes that are required for survival are regulated by diffusion.Facilitated diffusion is one form of diffusion and it is important in several metabolic processes of living cells.