Assessing the Impact of Leather Industries on Groundwater Quality of Vellore District in South India Using a Geochemical Mixing Model

Abstract

Deterioration of groundwater quality is one of the most critical issues in twenty-first century. The direct relations of water with all the living beings make it an extremely important commodity. Sources of pollution may be of natural or anthropogenic origin. Nowadays anthropogenic sources of pollution are much more than natural sources. India has 1083 tanneries, in which 577 are in Tamil Nadu which accounts for 44% of the total production of India. Vellore district has an indispensable place in the list. Over the 30–40?years groundwater around tanneries has become seriously polluted.     

The Narrative History of the Chocolate Wars: A Short and Tasty Bargaining Game

ABSTRACT

This single lesson classroom game is designed to test student knowledge of Realist and Liberal concepts through an imbalanced resource bargaining mechanic. The game is designed for approximately 20 students divided into state teams of three to four students each and uses chocolate to represent the state teams’ economic capacity, military capability, and human security. Each state team had competing goals, over which they must cooperate or conflict for additional pieces. This game also uses an abstract design to maximize active learning through a short course of play while also making the game useful for testing concepts at any point in an International Relations course. In addition to offering a complete yet easily modifiable game for classroom use, this article also describes the game’s pedagogical contribution to the discipline, game design notes, and techniques for preventing students from stuffing their faces with game pieces.     

Real-time forensic DNA analysis at a crime scene using a portable microchip analyzer

An integrated lab-on-a-chip system has been developed and successfully utilized for real-time forensic short tandem repeat (STR) analysis. The microdevice comprises a 160-nL polymerase chain reaction reactor with an on-chip heater and a temperature sensor for thermal cycling, microvalves for fluidic manipulation, a co-injector for sizing standard injection, and a 7-cm-long separation channel for capillary electrophoretic analysis. A 9-plex autosomal STR typing system consisting of amelogenin and eight combined DNA index system (CODIS) core STR loci has been constructed and optimized for this real-time human identification study. Reproducible STR profiles of control DNA samples are obtained in 2 h and 30 min with ≤0.8 bp allele typing accuracy. The minimal amount of DNA required for a complete DNA profile is 100 copies. To critically evaluate the capabilities of our portable microsystem as well as its compatibility with crime scene investigation processes, real-time STR analyses were carried out at a mock crime scene prepared by the Palm Beach County Sheriff's Office (PBSO). Blood stain sample collection, DNA extraction, and STR analyses on the portable microsystem were conducted in the field, and a successful “mock” CODIS hit was generated on the suspect's sample within 6 h. This demonstration of on-site STR analysis establishes the feasibility of real-time DNA typing to identify the contributor of probative biological evidence at a crime scene and for real-time human identification.