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Ghosh T.,Central Forensic Science Laboratory | Kalpana D.,Central Forensic Science Laboratory | Mukerjee S.,Central Forensic Science Laboratory | Mukherjee M.,Central Forensic Science Laboratory | And 5 more authors.
Forensic Science International: Genetics | Year: 2011

Seventeen short tandem repeats (DYS389I, DYS390, DYS389II, DYS19, DYS385a/b, DYS393, DYS391, DYS392, DYS439, DYS438, DYS456, DYS458, DYS635, Y(GATA)H4, DYS437, and DYS448) from the non-recombining region of the human Y-chromosome were analyzed in 750 unrelated males representing four major linguistic families of India using AmpFlSTR® Yfiler® PCR Amplification kit. A total of 612 distinct haplotypes were observed, of which 545 were unique. Rare alleles for the loci DYS456, DYS458, DYS635, Y(GATA)H4, and duplication at the loci DYS389I and DYS389II were also observed. To understand the genetic diversity of the Indian population, and utility of Y-STRs in forensics, the locus diversity, haplotype diversity, and discrimination capacity in all populations was determined. MDS plot based on pairwise Φst and AMOVA revealed the high genetic heterogeneity among the Indian populations due to linguistic diversity and social stratification. © 2011 Elsevier Ireland Ltd. All rights reserved.

Chakrabarti S.K.,Tripura State Forensic Science Laboratory | Ghosh S.,Tripura State Forensic Science Laboratory
Anil Aggrawal's Internet Journal of Forensic Medicine and Toxicology | Year: 2013

In one case, some exhibits were received where the modus operandi was smoking of tobacco and Cannabis mixed together in cigarettes. Though not unusual but such modus operandi are not very common except for some parts in India. Smoking of tobacco along with Cannabis poses a double threat to the users as the toxicity and addiction increases manifold times. The detection of active ingredients of tobacco and cannabis by two dimensional thin layer chromatographic technique and the toxicological aspects are discussed in this paper.

Pal A.,Tripura State Forensic Science Laboratory | Debnath S.,Tripura State Forensic Science Laboratory | Pratihari H.K.,Tripura State Forensic Science Laboratory
Journal of Advanced Microscopy Research | Year: 2014

The altercation between two political rival groups and subsequent exchange of firing inflicted bullet injury to some persons and death of a police personal and a civilian. On postmortem examination of two deceased, the medico-legal surgeon recovered some bullet fragments from the body of police personal and one partially deformed bullet from a civilian. The characteristic tool marks present on bullet fragments and deformed one were compared with each test fired bullet done from all the seized firearms. Further, some fired empty cartridge cases recovered from the spot were also compared with the test fired using ballistics microscope. The examination of all bullet fragments, cartridge cases and deformed bullet could help to individualize the specific firearm used in the crime. In addition to microscopic examination, the GSR analysis of suspected bullet holes on garments by SEM-EDX (scanning electron microscopy coupled to energy dispersive X-ray spectroscopy) could further establish to be caused by fired bullet only. Copyright © 2014 American Scientific Publishers All rights reserved.

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