A Research Note on the Cost of Not Being White in Brazil

This research note revisits the theme of “the cost of not being white in Brazil.” Based on 1996 National Household Survey (PNAD) data, the results point out to still sizeable and significant monetary disadvantages suffered by nonwhites in the Brazilian labor market. It is estimated that about 18 percent of the white-nonwhite income gap can be attributed to differential rates of return to human capital investments and to other individual characteristics between the race/color groups. Nelson do Valle Silva is Researcher at Laboratorio Nacional de Computacao Cientifica and Professor at Instituto Universitario de Pesquisas do Rio de Janeiro. His most recent books areMobilidade Social no Brasil, Sao Paulo: Makron Books, 1999 (with J. Pastore) andCor e Estratificacao Social no Brasil Rio: Contracapa, 1999 (with C. Hasenbalg and M. Lima). He received his Ph.D. in Sociology from the University of Michigan.     

The Portuguese adaptation of the Gudjonsson Suggestibility Scale (GSS1) in a sample of inmates

This paper comprises two studies which address the validity of the Portuguese adaptation of the Gudjonsson Suggestibility Scale, GSS1. In study 1, the means and standard deviations for the suggestibility results of a sample of Portuguese inmates (N = 40, M_age = 37.5 years, SD = 8.1) were compared to those of a sample of Icelandic inmates (Gudjonsson, 1997; Gudjonsson & Sigurdsson, 1996). Portuguese inmates' results were in line with the original results. In study 2, the means and standard deviations for the suggestibility results of the sample of Portuguese inmates were compared to those of a general Portuguese population sample (N = 57, M_age = 36.1 years, SD = 12.7). The forensic sample obtained significantly higher scores in suggestibility measures than the general population sample. ANOVA confirmed that the increased suggestibility in the inmates sample was due to the limited memory capacity of this latter group. Given that the results of both studies 1 and 2 are in keeping with the author's original results (Gudjonsson, 1997), this may be regarded as a confirmation of the validity of the Portuguese GSS1.     

Child and adolescent psychopathy: A state-of-the-art reflection on the construct and etiological theories

Purpose

There is a growing interest in the identification of psychopathic traits in infancy and adolescence. This effort will enable the development of predictive models of aggressive and violent behavior, in order to intervene effectively both in preventive and therapeutic levels. Several authors have suggested that the presence or absence of psychopathic traits, together with the factors that sustain, maximize or minimize them, can help in the identification of the etiology and developmental trajectories of anti-social individuals.

Materials and Methods

Meta-narrative review of the child and adolescent psychopathy construct.

Results

This state-of-the-art review discusses the concept of child and adolescent psychopathy, taking into account historical and conceptual issues.

Conclusion

Evolutionary Theories can add a major contribution to the understanding of the origins of psychopathic traits.     

Assessing a novel room temperature DNA storage medium for forensic biological samples

The ability to properly collect, analyze and preserve biological stains is important to preserving the integrity of forensic evidence. Stabilization of intact biological evidence in cells and the DNA extracts from them is particularly important since testing is generally not performed immediately following collection. Furthermore, retesting of stored DNA samples may be needed in casework for replicate testing, confirmation of results, and to accommodate future testing with new technologies.A novel room temperature DNA storage medium, SampleMatrix™ (SM; Biomatrica, Inc., San Diego, CA), was evaluated for stabilizing and protecting samples. Human genomic DNA samples at varying amounts (0.0625-200 ng) were stored dry in SM for 1 day to 1 year under varying conditions that included a typical ambient laboratory environment and also through successive freeze-thaw cycles (3 cycles). In addition, spiking of 1-4× SM into samples prior to analysis was performed to determine any inhibitory effects of SM. Quantification of recovered DNA following storage was determined by quantitative PCR or by agarose gel electrophoresis, and evaluation of quantitative peak height results from multiplex short tandem repeat (STR) analyses were performed to assess the efficacy of SM for preserving DNA.Results indicate no substantial differences between the quality of samples stored frozen in liquid and those samples maintained dry at ambient temperatures protected in SM. For long-term storage and the storage of low concentration samples, SM provided a significant advantage over freezer storage through higher DNA recovery. No detectable inhibition of amplification was observed at the recommended SM concentration and complete profiles were obtained from genomic DNA samples even in the presence of higher than recommended concentrations of the SM storage medium. The ability to stabilize and protect DNA from degradation at ambient temperatures for extended time periods could have tremendous impact in simplifying and improving sample storage conditions and requirements. The current work focuses on forensics analysis; however this technology is applicable to all endeavors requiring storage of DNA.     

Contribution to the Development of Guidelines in the Analysis of Biological Evidence in Sexual Assault Investigations

This investigation intends to study materials and techniques used for biological evidence collection in sexual assault cases and is divided into two stages: in stage one, methods for biological evidence collection (the single swab (including three variants) and the “double swab technique”) were compared; in stage two, swabs’ component material was compared. The sampling was composed of 42 heterosexual couples who provided mock samples. The collection methods in which the whole swab is covered by evidence presented significantly better outcomes (p < 0.001), such as the “double swab technique.” Additionally, nylon swabs proved to present significantly better features regarding the capacity of sample elution, providing significantly higher amounts of DNA (p ≤ 0.034). This study provides guidelines for better collection of biological evidence regarding the collection method using a swab and the proper swab material to utilize.