A study of DNA transfers onto plastic packets placed in personal bags

The ability to detect low level DNA brings with it the uncertainty of whether the detected DNA is a result of transfer. To address this uncertainty, a simulation study was conducted in which a mock illicit drug packet was placed into the personal bags of individuals. When the average transit time of the packets was increased from around 2 h to more than 14 h, the percentage of the DNA profiles recovered from the packets which could be attributed to the individuals increased greatly from 5.3% to 48.6%. We found that drug packers who were poor shedders could not be included as contributors to the DNA profiles from the drug packets at all and there was a higher chance that individuals other than themselves could be included as contributors to the DNA profile recovered from drug packets. We also found that it was equally likely that the drug packers who had direct contact with the drug packets and bag owners who did not, could be included as contributors to the DNA profiles recovered from the packets. The results in this study highlight the importance of taking into consideration the transit time of drug packet, the shedder status of the alleged packer and the history of an item, when evaluating DNA evidence in the context of illicit drug activities.     

Strengthening Youth Exchanges and Enhancing Mutual Understanding among Peoples——Sidelights on Receiving JCI Japan-China Friendship Association Delegation

正At the invitation of the Chinese Association for International Understanding(CAFIU),a 10-member JCI(Junior Chamber International Japan)delegation headed by Agehara Yasumaro,Chairman of JCI Japan-China Friendship Association and Hayashi Hiroshi,Vice-Chairman of JCI Japan-China Friendship Association visited Beijing from May 19-22.Junior Chamber of Japan(JC for short)was established in 1951 and it has 698 chapters across     

Returning to the Original Point of Normalization of China-Japan Relations and Renewing Peaceful and Friendly Relations between Governments

正Japan and China are neighbors that cannot move away from each other.Thus,it’s quite natural that there are quarrels between them because we are so close to each other.There is no other option between Japan and China except peace and friendship.On the occasion of the 3rd Anniversary of the normalization of Japan-China diplomatic relations on September 29,1975,in order to solidify the     

INNOVATIVE DIPlOMACY

正PM’s visit enriches China’s cooperation with European partners By Bai ShiChinese Premier Li Keqiang paid an official visit to three European countries—Germany,Russia and Italy—between October 9 and 18.In addition to a good number of     

Laying Tracks for Peace

正Solution to the South China Sea issue is ready to work on August 8-10,the 47th ASEAN(Association of Southeast Asian Nations)Foreign Ministers Meeting(AMM)and its related gatherings brought together top diplomats from 27 nations,including 10 ASEAN member states and their Dialogue Partner countries,in Nay Pyi Taw,capital of Myanmar,to discuss political,security and development issues that have     

INVESTING IN RESILIENT GROWTH

正China adds new vitality to global governance during Brisbane G20 SummitLeaders of the Group of 20(G20)have promised to work together to lift growth,boost economic resilience and strengthen global institutions upon concluding their summit meeting held in Brisbane,Australia,on November 15-16.     

Dating of Inkpad Seals Using the Extraction Rate Method: Preliminary Findings

Inkpad seals are often placed on important documents, and determining the date when a seal was affixed can be important to assess the authenticity of a document. In this study, three different brands of inkpads and four different types of paper were used to make diachronic samples of the seals. A double‐solvent extraction method was employed to date the inkpad seals by comparing extraction rates with inks of known age. Cyclohexane was selected as a weak solvent, and chlorobenzene was selected as a strong solvent. After testing, curves were created to show the relationship between the extraction percentage of ink and the date of the seals. The experimental results showed that the extraction rate method was applicable for the relative dating of inkpad seals in some cases where the seal was placed on the document within 6 months.     

论仲裁协议的完善

有效的仲裁协议是仲裁制度的基础,仲裁协议是当事人自愿达成的、期待快速解决争议、降低诉讼成本的意思表示。但我国《仲裁法》自1995年颁布之时,就受到了多方面的制约,有些方面已成为制约仲裁制度完善发展的法律障碍。《仲裁法》的修改应本着尊重当事人自治的原则,取消对仲裁协议内容僵化的要求,确立临时仲裁的法律地位,尊重仲裁管辖。     

A novel chitosan/tripolyphosphate/L‐lysine conjugates for latent fingerprints detection and enhancement

Most chemical and physical methods employed in visualizing latent marks have shown detrimental effects on human health and, therefore, some research groups have directed their attention to the utilization of various (bio)polymers with the aforementioned purpose. Although chitosan is widely used in medicine, pharmacy, food, and drug delivery systems, there are very few studies that address this biopolymer utilization in forensic applications, such as the detection of latent fingerprints. We used chitosan crosslinked with sodium tripolyphosphate and conjugated with L‐lysine to enhance the visualization of latent fingerprints, due to its ability to interact with fingerprint sweat residues. These conjugates were prepared using different (w/w) amounts of chitosan and tripolyphosphate (6/1; 4/1; 1/1; 1/4; and 1/6), and those with the most promising results (i.e., 6/1 formulation) were investigated in detail. Fourier transform infrared (FT‐IR) spectroscopy confirmed interactions between components of the systems. Optical microscopy and scanning electron microscope (SEM) analysis showed that prepared powder formulations were uniform in size and confirmed that chitosan/tripolyphosphate/lysine conjugates bind easily to the sweat and lipid residues present in the latent fingerprints. The testing of prepared conjugates demonstrated the potential of these systems as bio‐based powder substitution for commercially available powders.