Protective effect and action mechanism of petroleum ether extracts from Saussurea involucrate on brain tissues of hypoxia rats Effect of puerarin on hypoxia induced proliferation of PASMCs by regulating reactive oxygen Effect of polypetide extract from scorpion venom(PESV) on expression of HIF-1α and SDF-1/CXCR4 in repopulating H22 tumour tissue during chemotherapy treatment Effect of extract from the male zooid of Antheraea pernyi on hypoxia-inducible factor-1α expression in tumor-bearing rats after radiotherapy Effect of extract from male zooid of Antheraea pernyi on hypoxia-inducible factor-1α expression in tumor-bearing rats after radiotherapy