Evaluation of a Visualization Assay for Blood on Forensic Evidence

In forensics, bloodstains on dark fabrics might be invisible for the naked eye. Although several visualization, presumptive, and confirmatory blood tests have been developed, all have one or more disadvantages, especially on DNA analysis. We report here the use of a visualization assay that can visually detect blood drops up to 1/20 dilution. In this assay, the fabric is placed between two wet filter papers and covered by glass surfaces on both sides. Pressure is applied on the glass surfaces in which bloodstains transfer onto the filter papers through capillary forces. Detected stains can be tested with other more sensitive presumptive blood tests performed on the filter paper. Even more, DNA analysis can be performed on the transferred bloodstains. The presented visualization assay is easy to perform, extremely cheap, requires little hands on time, and does not affect bloodstain pattern analysis.     

Natural resource growth poles and frontier urbanization in Latin America

What does globalization mean for societies dependent on natural resource extraction? Synthesizing comparative evidence with empirical analysis from Venezuela, I show how the “growth pole” model for economic growth translated to an applied model for the spatial transformation of Latin America’s resource frontier, and the contradictions this development model engendered. Specifically, I weigh, local versus national consequences of Venezuela’s variation of the growth pole concept, Ciudad Guayana. Despite unimaginable natural resources and staggering public investments, this forty-year-old frontier metropolis is Latin America’s most successful experiment with the model, yet it remains constrained by its status as a source of raw materials.     

Genomic research and incidental findings.

The Human Genome Project showed that there is significant genetic variation within the population. Current research is accumulating large databases that may reveal genetic variations associated with disease or health risks, even if not intended as part of the study design. These incidental findings create legal, ethical, and financial challenges for researchers. Current federal and international guidelines are not adequate. Plans for dealing with incidental findings need to be established in the study design and reviewed and approved by the Institutional Review Board.