Pnas is the top level in the world. PNAS is a top international interdisciplinary academic journal, and its published papers cover biology, medicine, chemistry, physics, mathematics, ecology and so on. In this study, Associate Professor Jing Yupu, a young teacher, is the first author, Professor Zhou Shutang is the correspondent author, doctoral students Li Lunjie and master student Zhang Ci are the co-authors, and Henan University is an independent unit. This research is supported by the key projects of National Natural Science Foundation, the key projects of joint funds and the youth projects.

Pnas is one of the four famous journals in the world. Pnas is the English abbreviation of the Journal of the National Academy of Sciences, which is a periodical of the National Academy of Sciences.

PNAS, the full name of the Proceedings of the National Academy of Sciences, was founded on 19 14. It is one of the few "hundred-year journals" in the world and one of the "Nature, Science, Cell and PNAS" in the international periodical field, and its publishing frequency is weekly.