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2005 Issue 01 (Total No. )
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Examination of Photocopy Toners by Pyrolysis Gas Chromatography WANG Ying-qiang;JIANG Hua;LIU Ming-hui;WANG Cong-hui(Chinese People's Public Security University;Beijing000;China;Institute of Criminal Science and Technology;Beijing Public Security Bureau;Beijing 00000;China;Institute of Forensic Science;Mi 2005(01): 11-14.  Abstract ( )   Photocopy toners were collected and analyzed with Pyrolysis Gas Chromatography Spectrometry (Py-GC). Minor differences in composition of photocopy toners of different factories and different brands of the same factories were detected. In the study, an improved Munson's sampling method was employed and effects of paper fiber were eliminated. Results of the method were stable and repeatable, and the discriminating rate readied 90.3%. Related Articles | Metrics

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Study on the Correlation Between PMI and Vitreous Humor of Rabbits LIU Cheng-quan;WANG Wei-ping;LONG Ren;XIONG Ping(People's Court of Xiangtan;Xiang tan 00;China;People's Court of Hengyang;Hen yang 00;China;Department of Forensic Medicine;Nanhua University;Hen yang 00;China) 2005(01): 15-17.  Abstract ( )   Objective To seek a new way of estimating postmortem interval (PMI). Methods Comparing obscurity was used to measure the two enzymes' activity of HBDH and LDH in vitreous humor of rabbits under different ambient temperatures (25-30℃;10-15℃) in the course of 0-54 hours after death. Results There was a different plateau period for the two enzymes' activity after a short period of death and the activity decreased quickly after the plateau period, reaching zero after 54 hours of death in low temperature groups and 48 hours in high ones. There existed high negative correlativity between the two enzymes' activity and PMI at a given range (P<0.05). Conclusion PMl can be roughly estimated by using simple regression equation and accurately estimated by using multiple regression equation. Related Articles | Metrics