01 August 2007, Volume 0 Issue 4

    

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  Developement of heroin geographic origin research

  XU Peng, BAI Yanping, ZHANG Chunshui

  Forensic Science And Technology. 2007, 0(4): 3.

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  Heroin geographic origin research is an important issue concerned by the authorities of many countries. In this paper, combining the technical exchanges what the authors communicated with the Drug Enforcement Administrations Special Testing and Research Laboratory (STRL) of the United States, the analysis methods and data processing methods for heroin geographic origin research applied by major countries of the world in the recent thirty years were reviewed and investigated.
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  Accreditation of trace evidence testing laboratories

  QUAN Yangke, SUN Yuyou, ZHOU Hong

  Forensic Science And Technology. 2007, 0(4): 9.

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  In this paper, the difficulties and questions concerned in the accreditation of trace evidence laboratories were analyzed and some practical measures for achieving the accreditation were suggested.
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  Hormone level in corpse organ with time after　dead

  YU Farong, LIAN Xiuzhen, FENG Shutao

  Forensic Science And Technology. 2007, 0(4): 13.

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  ObjectiveTo study　the change of　hormone levels with the time after death. MethodsEndothelin ,thromboxane and cortisol levels of　liver, spleen　of animals killed at different time were determinated with　method of RIA. Results3h,6h,24h,36h,72h after the death of animals, endothelin and thromboxane were　decreased significantly(P <0.001) compared with that of 0h; cortisol levels in 3h, 6h　after death gradually reduced, increased 24h　and then reduced, but also changes have also shown a trend. ConclusionHormone　levels　of organs after death with the extended time of death reduced.
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  Comparative studies on handwriting features of Chinese and English scripts

  HAN Danyan，WANG Jingwen，LI Zhen，et al

  Forensic Science And Technology. 2007, 0(4): 16.

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  The features of Chinese handwriting and English handwriting were studied comparatively. We find that class system for two kinds handwriting is approximately same, but there are some differences between the two kinds of scripts，Such as the classification of handwriting features，selection of features，Selection of features, Using frequency of separate features, and understanding of the variation of the same personal handwriting features because of the difference in characteristics and culture container．English handwriting characteristics emphasize in dynamic states, while Chinese handwriting characteristics emphasize in static states；English handwriting characteristics emphasize in diagraph，while Chinese handwriting characteristics emphasize in description；The lines characteristics of English are outstanding， while the sequence of Chinese strokes and the writing method of Chinese scripts are outstanding.
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  Real time PCR quantificational study of DNA extracted from oral swabs

  YANG Dian, LI Yue, LIU Chao, et al.

  Forensic Science And Technology. 2007, 0(4): 23.

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  Objective To study how to improve multiplex STR amplification efficiency from oral swabs DNA. MethodDifferent oral swab DNA extracted by Chelex100 method or DNA IQ system magnetic bead method were quantitated by real time PCR technique, and typed with Identifiler systems in 3100 Genetic Analyzer. ResultsIn the 8μl Identifiler amplification system established, the amplification of 1μl template was more efficient than 3μl for the DNA extracted from oral swabs within 3 months by Chelex100 method. However, the quantity of DNA template extracted by DNA IQ system exerted little effects on the amplification efficiency. ConclusionIt is simple and operative method to improve the DNA analysis efficiency extracted from oral swabs by swabbing oral mucous membrane 5 times firstly, then extracting DNA from 1/4 vertical swab by 200μl Chelex100 method, and amplifying with 1μl template finally. The DNA of stale oral swabs extracted by DNA IQ system could be amplified more effectively.
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  Development of latent finger print by　using the iodine heatsublimating spraygun

  ZHANG Jian,ZHANG Miao Miao

  Forensic Science And Technology. 2007, 0(4): 26.

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  This article introduce a new method to make the latent fingerprints emerge by using the iodine heatsublimating spraygun heated by a sort of quartz lamp. Experiments indicate that this method can be widely applied and can show fingerprints in a effective way, especially in showing the latent fingerprints left on the wall surface, on the aluminum　alloy surface, and on UPVC surface.
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  A preliminary study of halftone structures　on images produced by printers and copiers

  LIU　Ning, PEI Lei

  Forensic Science And Technology. 2007, 0(4): 29.

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  This paper discusses halftone structures　shaped by the techniques of colour　printing. The authors　have studied the outputs　of over a hundred　of the colour printers, and find out this kind of characteristics　have particularity　and stability. Questioned document examiners should　use them as one of class characteristics　of colour printers.
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  Identification of forged sequence number on the vehicles

  ZHAO Chunmei

  Forensic Science And Technology. 2007, 0(4): 33.

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  In this paper, the development of techniques for identification and recovery of VIN were reviewed.
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  Elementary study on data recovering

  YANG Zhixia, LIU Weicheng

  Forensic Science And Technology. 2007, 0(4): 36.

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  ObjectiveTo introduce the application of data recovery technique. MethodFor different failures of hard disk, such as physical failure and logical failure, EasyRcovery and Finaldata software were used respectively. ResultThe most damaged data recovered successfully. ConclusionEasyRcovery and Finaldata software can be used in casework.
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  The testification of the reliability of gait impression theory through thenar pressure distribution

  SHI Limin， DU Tao, GAO Yi

  Forensic Science And Technology. 2007, 0(4): 39.

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  Using Footscan gait systems made in Belgium, we investigate fully and quantitatively the thenar pressure distribution and the motion of foot while walking in normal speed.After the processing of the pressure data of 154 healthy male walking with bare foot on the sensor plate, we analyze a great deal of resultant data by means of Mathematical Statistics based on the theories of sports physiology,sports biomechanics and the traditional gait impression theory, we carried out some experiments to investigate fully and quantitatively the process of the unrolling of foot and the motion of foot during the formation of gait impression to testify the traditional gait impression theory. Finally we set forth a modified gait impression theory, discuss the reliability and the value of the gait impression, and provide some reference for the identification method of gait impression and for the further development of gait impression theory.