Determining Bruise Etiology in Muscle Tissue Using Finite Element Analysis

Bruising, the result of capillary failure, is a common physical exam finding due to blunt trauma and, depending on location and severity, a potential indicator of abuse. Despite its clinical relevance, few studies have investigated the etiology of capillary failure. The goal of this study was to determine whether capillaries primarily fail under shear stress or hydraulic‐induced tensile stress. An arteriole bifurcating into four capillaries was modeled using ANSYS 14.0 ^®. The capillaries were embedded in muscle tissue and a pressure of 20.4 kPa was applied. Any tensile stress exceeding 8.4 × 10⁴ Pa was considered failure. Results showed that failure occurred directly under the impact zone and where capillaries bifurcated, rather than along the line of greatest shear stress, indicating that internal tensile stress is likely the primary mode of capillary failure in bruising. These results are supported by the concept that bruising can occur via blunt trauma in which no shearing lacerations occur.     

Officer Preferences for Male Backup: The Influence of Gender and Police Partnering

Much of the extant literature regarding women in policing focuses on job stress, perceptions of job performance, and inherent difficulties associated with their immersion in a traditionally male-dominated profession. Little attention, however, has been given to perceptions regarding gender and backup preferences among police officers. This study sought to examine the impact of professional and demographic characteristics of municipal police officers in a southern state on preferences for male police officers as backup. Multivariate analysis indicated that gender, partner status, race, and marital status significantly impacted officer preferences for male backup. However, further examination of the interaction effect between gender and partner status revealed a gap in the preferences for officers with no partners. Although officers with no partners reported lower overall preferences for male backup than officers with female or male partners, the disparity of preference between male and female officers with no partners was sizeable.     

Ethnic Label Use in Adolescents from Traditional and Non-Traditional Immigrant Communities

Understanding adolescents’ use of ethnic labels is a key developmental issue, particularly given the practical significance of identity and self-definition in adolescents’ lives. Ethnic labeling was examined among adolescents in the traditional immigrant receiving area of Los Angeles (Asian n = 258, Latino n = 279) and the non-traditional immigrant receiving area of North Carolina (Asian n = 165, Latino n = 239). Logistic regressions showed that adolescents from different geographic settings use different ethnic labels, with youth from NC preferring heritage and panethnic labels and youth from LA preferring hyphenated American labels. Second generation youth were more likely than first generation youth to use hyphenated American labels, and less likely to use heritage or panethnic labels. Greater ethnic centrality increased the odds of heritage label use, and greater English proficiency increased the odds of heritage-American label use. These associations significantly mediated the initial effects of setting. Further results examine ethnic differences as well as links between labels and self-esteem. The discussion highlights implications of ethnic labeling and context.     

The Longitudinal Relationships Between Rural Adolescents’ Prosocial Behaviors and Young Adult Substance Use

While many adolescents and young adults experiment with substances (e.g., alcohol, cigarette smoking, marijuana), recent research suggests that rural youth and young adults may be more at risk for substance use than their urban counterparts. This study was designed to examine the longitudinal relationships between rural adolescents’ prosocial behaviors and substance use in young adulthood. Furthermore, we examined the potential mediating effects of adolescent substance use, academic investment, and delinquency. Rural youth (N = 531; 263 girls) were surveyed in grades 10–12 (Time 1; M age = 16.17; SD = .91) and again in early adulthood (Time 2). Measures of prosocial behaviors, substance use, academic investment, and deviant activities were assessed at Time 1. At Time 2, measures of marijuana use, cigarette smoking, and getting drunk were administered. Overall, the findings showed that rural adolescents who frequently exhibit prosocial behaviors are less likely to engage in substance use in young adulthood than those who exhibit relatively low levels of prosocial behaviors. These findings indicate that prosocial behaviors may have positive health consequences, establishing behavioral trajectories that lead to lower levels of risky health behaviors in adulthood in rural populations.     

Public Engagement for Informing Science and Technology Policy: What Do We Know,What Do We Need to Know,and How Will We Get There?

This article examines social science relevant to public engagements and identifies the challenges to the goal of meaningful public input into science and technology policy. Specifically, when considering “which forms, features, and conditions of public engagement are optimal for what purposes, and why?” we find social science has not clarified matters. We offer a model to guide systematic research that defines and empirically connects variations in features and types of public engagement activities to specifically defined variations in effective processes and outcomes. The specification of models, as we have done, will guide policy makers, practitioners, and the public in determining what kinds of engagement techniques are optimal for what kinds of purposes. Our model is presented to start conversations and inspire research that in the future should help to ensure meaningful public participation that meets the promise of contributing thoughtful societal values and perspectives into governmental policies impacting science and technology research.     

Public health and vulnerable groups

Editors' Introduction

Public health and vulnerable groups     

Familicide-suicide: a cluster of 3 cases in Los Angeles County

Familicide and familicide-suicide have not been extensively documented or adequately defined in forensic and psychiatric literature. Such incidents occupy a distinct epidemiological niche and are often precipitated by financial stressors. We present a cluster of 3 such cases, all of which occurred within a 4-month period in Los Angeles County, Calif. The dynamics of these cases are evaluated relative to the literature.     

Analysis of active ricin and castor bean proteins in a ricin preparation, castor bean extract, and surface swabs from a public health investigation

In late February 2008, law enforcement officials in Las Vegas, Nevada, discovered in a hotel room, a copy of The Anarchist Cookbook, suspected castor beans and a "white powder" thought to be a preparation of ricin. Ricin is a deadly toxin from the seed of the castor bean plant (Ricinus communis). The United States regulates the possession, use, and transfer of ricin and it is the only substance considered a warfare agent in both the Chemical and the Biological Weapons Conventions. Six samples obtained from the hotel room were analyzed by laboratories at the Centers for Disease Control and Prevention using a panel of biological and mass spectrometric assays. The biological assays (real time-PCR, time resolved fluorescence and cytotoxicity) provided presumptive evidence of active ricin in each of the samples. This initial screen was followed by an in-depth analysis using a novel, state-of-the-art mass spectrometry-based ricin functional assay and high sensitivity tandem mass spectrometry for protein identification. Mass spectrometric analysis positively identified ricin and confirmed that in each of the samples it was enzymatically active. The tandem mass spectrometry analysis used here is the most selective method available to detect ricin toxin. In each sample, ricin was unequivocally identified along with other R. communis plant proteins, including the highly homologous protein RCA120. Although database searches using tandem mass spectra acquired from the samples indicated that additional controlled substances were not present in these samples, the mass spectrometric results did provide extensive detail about the sample contents. To the best of our knowledge following a review of the available literature, this report describes the most detailed analysis of a white powder for a public health or forensic investigation involving ricin.