在法医学中准确地推断死亡时间，对于刑事侦察和破案具有重要意义。本研究组几年来应用小白鼠和人肝脏５＇—核苷酸酶（５′—ＮＴ）活力进行推断死亡时间的研究，经过大量实验取得了一些宝贵的成果［１．２．３］，并对一些酶的性质、应用方法和影响因素等方面的问题，取得一 Accurately infer the time of death in forensic science is of great significance to criminal reconnaissance and detection. In the past few years, the research group used in vitro and in vivo liver 5-nucleotidase (5’-NT) activity to deduce the time of death and made some valuable achievements after extensive experiments [1.2.3] For some of the nature of the enzyme, application methods and influencing factors and other aspects, to obtain one