The vast majority of consumers say they purchase locally grown products at least occasionally (90%). Consumers exhibit a level of inherent trust in the quality they associate with local products. Source: FMI U.S. GroceryShopper Trends 2014,n=2116.
barrier barÂ·riÂ·er (bÄr'Ä-Ér) n. A structure, such as a fence, built to bar passage. A boundary or limit. An obstacle or impediment. Something that separates or holds apart. Something immaterial that obstructs or impedes behavior. A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.
A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Biological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae.