Polygonum 1 Polygonum chinense Polygonum chinense extract 1 acute toxicity 1 alcohol 1 animal experiment 1 animal model 1 article 1 controlled study 1 down regulation 1 female 1 heat shock protein 70 1 histopathology 1 immunohistochemistry 1 lipid peroxidation 1 male 1 malonaldehyde 1 mucosal bleeding 1 nonhuman 1 omeprazole 1 periodic acid Schiff stain 1 plant extract 1 plant leaf 1 priority journal 1 protein Bax 1 rat 1 stomach mucosa injury 1 stomach protection 1 stomach ulcer 1 superoxide dismutase 1