permeability 28 human 24 Permeability 23 Article 22 Humans 20 controlled study 20 chemistry 19 nonhuman 16 Animals 12 metabolism 12 animal 11 cell membrane permeability 9 drug effect 9 unclassified drug 9 Petroleum reservoir engineering 8 human cell 8 membrane permeability 8 tensile strength 8 Mechanical permeability 7 scanning electron microscopy 7 Caco-2 cell line 6 Gas permeability 6 Gases 6 Materials Testing 6 Pore size 6 Porous materials 6 Tensile Strength 6 female 6 food packaging 6 materials testing 6