Histopathological study on allergic rhinitis treated with Centipeda minima Protective effect of purariae isoflavone on apoptosis cells of nasal mocosas in ovariectomized rats Evaluation of nasal absorption for geniposide solution Optimization for formulation of Zhi Xiong San thermo-sensitive gel by central composite design-response surface method and study on characterization of its nasal mucosal permeability Characterization and in vitro permeation of nasal mucosa evaluation of inclusion complex of cholic acid-hydroxypropyl-β-cyclodextrin