Stem cell terminology: practical, theological and ethical implications

Stem cell policy discussions frequently confuse embryonic and fetal sources of stem cells, and label untested, non-reproductive cloning as "therapeutic." Such misnomers distract attention from significant practical and ethical implications: accelerated research agendas tend to be supported at the expense of physical risks to women, theological implications in a multi-faith community, informed consent for participation in research, and treatment decisions altered by unrealistic expectations.     

Analysis of postmortem DNA degradation by single-cell gel electrophoresis

One of the most important longstanding problems in the field of forensic medicine is the determination of the time of death upon the discovery of a possible homicide victim. With a majority of homicide victims discovered within the first 48h, it is critically important to be able to determine time of death quickly, and with accuracy and precision. Current methods of determining postmortem interval (PMI) vary, but none can provide better than an 8-h window time estimate. In this paper, the potential application of single-cell gel electrophoresis (SCGE), also known as the comet assay, to evaluate postmortem cell death processes, specifically nuclear DNA fragmentation, is assessed. Upon the death of an organism, internal nucleases contained within the cells should cause chromosomal DNA to degrade into increasingly smaller fragments over time, and if these fragments can be isolated and visualized, the fragmentation should prove to be measurable and quantifiable. An original study providing proof of the concept of postmortem DNA fragmentation between early and late time periods was conducted using human leukocytes. With an established trend seen in the leukocyte results, this study was then expanded using a porcine animal model, over a longer time period, with more frequent time-points evaluated. DNA degradation in all samples was revealed by SCGE and quantified by the use of DNA-specific quantitative stains, as measured by digital camera affixed to a microscope. The comet 'tail-moment' gave a measure of the proportion of fragmented to non-fragmented DNA, while the 'tail-length' provided the relative size of degraded DNA fragments. In both models, an increase in DNA fragmentation was found to correlate with an increased PMI from 0 to 56h postmortem, as evaluated by comet-tail-moment and by comet-tail-length, with tail-length providing the strongest statistical correlation, based upon regression analysis. The postmortem DNA fragmentation observed in this study, reveals a sequential, time-dependent process with the potential for use as a predictor of PMI in homicide cases.     

Psychopathology and tattooing among prisoners

Tattooing has always been associated with criminals. Indeed, it is both an administrative and clinical problem in prisons. This article looks at the relationship between psychopathology and tattooing infractions within prison. Using a sample of 8,574 male inmates in the Colorado Department of Corrections, initial admission personality testing was compared to tattooing infractions within the next 2 years. Personality types more likely to engage in tattooing included Antisocial, Sadistic, Negativistic, and Borderline. Compulsive personality types engaged in relatively less tattooing. Clinical syndromes associated with more tattooing included Mania, Drug Abuse, Post-Traumatic Stress disorder, and Thought Disorder.     

Allele frequencies of sixteen STRs in the population of Northern Portugal

Allele frequencies of sixteen autossomal short tandem repeats (STRs), D3S1358, VWA, D16S539, D8S1179, D21S11, D18S51, TH01, FGA, D5S818, D13S317, D7S820, TPOX, CSF1PO, Penta D, Penta E (included in the PowerPlex 16 kit), and the SE33 (PowerPlex ES Monoplex System SE33) were determined in a sample of 200 healthy unrelated individuals from the north of Portugal.     

Immunohistochemical quantification of pulmonary mast-cells and post-mortem blood dosages of tryptase and eosinophil cationic protein in 48 heroin-related deaths

Recent studies suggest that many fatal heroin overdoses are caused by anaphylactoid reaction. In the present study we measured tryptase and eosinophil cationic protein in post-mortem blood of 48 deaths after heroin injection. We also investigated the presence and pulmonary distribution of mast-cells using specific immunohistochemical antibody for tryptase and morphometric evaluation in those cases of heroin-related deaths. The data were compared with 44 subjects who died following head trauma and to 32 cases of fatal anaphylactic shock. In the heroin-related death cases, the measurements of serum tryptase levels and eosinophil cationic protein dosages resulted in particularly elevated concentrations compared with the trauma cases. Nevertheless, the data that our study supplies by immunohistochemical techniques indicate that when mast-cells count in the lung was determined, no definite pattern was obtained between fatal heroin overdose cases and the control groups. Furthermore, the wide range of morphine concentrations found in post-mortem blood samples suggest that the term ‘overdose’ is relative and does not sufficiently characterize death associated with heroin addiction. Our study confirms that elevated concentrations of serum tryptase are associated with many heroin-related deaths. At this moment to attribute the cause of these deaths to ‘heroin overdose’ ignores the likely causal contribution of other possible systemic reactions to the mechanism of death.     

Fatal footsteps: murder of undocumented border crossers in Maricopa County, Arizona

In the past 5 years, the mortality rate among undocumented workers in Arizona has increased steadily. In 1998-1999, the number of deaths among border crossers was 28. That number increased dramatically in 1999-2000 to 106 and has exceeded 200 in each of the past 2 years. In the past, many immigrant deaths occurred as a result of dehydration and exposure (1). More recently, a new trend has emerged, that is, death of border crossers at the hands of the persons ("coyotes") hired to lead them across the border to safety. In some cases, the smugglers attempt to extort additional money from the families by holding the victims hostage once they have crossed the border into the United States. If the families fail to pay, the hostage is killed. Rival gangs are also murdering one another over their human cargo. Nine recent cases illustrate this trend in Maricopa County. In each example, the victims were bound, shot (or in one instance stabbed) and dumped in a remote desert area. All of the decedents were linked to murder for extortion by the 'coyotes' or rival gang members.