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Gramicidin is a lipophilic substance, the two short bacitracinmolecules are dimer to the left helix space configuration, constitute a cross-lipid membrane membrane channel to combine and carry a specific cation from the side of the membrane into the channel and then spread to The other side of the membrane, so there is the name of ion s, so that the cell metabolism can not be normal and inhibited or even death. They have a significant effect on Gram-positive bacteria.