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111.
Investigating Residential History Using Stable Hydrogen and Oxygen Isotopes of Human Hair and Drinking Water
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Madeleine Mant M.Sc. Ashley Nagel M.A. Tracy Prowse Ph.D. 《Journal of forensic sciences》2016,61(4):884-891
The relationship between isotopic signals in human hair and geographic region has potential forensic applications for identifying unknown individuals' place of recent residence. This study analyzes δ2H and δ18O isotopes in residential tap water and bulk hair samples from 17 volunteers representing 12 locations in Ontario, Canada. There is a strong correlation (R2 = 0.9) between δ2H and δ18O values of the water samples. In contrast, the δ2H and δ18O values of the hair samples are weakly correlated (R2 = 0.3), and the greater variability in the data is linked to dietary factors. This study demonstrates that the δ2H and δ18O values of hair and drinking water can be used to help identify potential place of residence in forensic cases, particularly in relation to proximity to large bodies of water such as the Great Lakes, but interpretations are complicated by the contribution of both water and diet to δ2H and δ18O values in hair. 相似文献
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Abstract: This study examines underwater soft tissue decomposition of dismembered pig limbs deposited in polyethylene plastic bags. The research evaluates the level of influence that disposal method has on underwater decomposition processes and details observations specific to this scenario. To our knowledge, no other study has yet investigated decomposing, dismembered, and enclosed remains in water environments. The total sample size consisted of 120 dismembered pig limbs, divided into a subsample of 30 pig limbs per recovery period (34 and 71 days) for each treatment. The two treatments simulated non‐enclosed and plastic enclosed disposal methods in a water context. The remains were completely submerged in Lake Ontario for 34 and 71 days. In both recovery periods, the non‐enclosed samples lost soft tissue to a significantly greater extent than their plastic enclosed counterparts. Disposal of remains in plastic bags therefore results in preservation, most likely caused by bacterial inhibition and reduced oxygen levels. 相似文献
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Tracy Evian Waasdorp Courtney N. Baker Brooke S. Paskewich Stephen S. Leff 《Journal of youth and adolescence》2013,42(2):263-274
While much prior research has documented the negative associations between aggression, peer relationships, and social skills, other research has begun to examine whether forms of aggression also may be associated with prosocial skills and increased social status. However, few studies have examined these associations within diverse samples of elementary aged youth. The current study examined the associations between aggression, popularity, social preference, and leadership among 227 urban, ethnic minority (74 % African American, 9 % bi-racial including African American, 12 % other ethnic minorities, and 5 % European American) elementary school youth (average age 9.5 years, 48.5 % female). Results indicated that in an urban, high risk environment, displaying aggressive behaviors was associated with increased perceived popularity, decreased social preference, and, in some cases, increased perceived leadership. The results also suggested gender differences in the association between the forms of aggression (i.e. relational and overt) and popularity. The current study underscores the importance of examining youth leadership along with forms of aggression and social status among urban minority youth. Implications for future research and aggression prevention programming are highlighted. 相似文献
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Tracy M. Scull Janis B. Kupersmidt Jennifer Toller Erausquin 《Journal of youth and adolescence》2014,43(5):717-728
Media-related cognitions are a unique influence on adolescents’ substance use outcomes even after accounting for the powerful influence of parent and peers. This cross-sectional study expands upon prior research by investigating the impact of media-related cognitions on children’s alcohol and tobacco outcomes in the context of parental and peer substance use. Six hundred forty-nine elementary school children (M = 9.4 years of age, SD = 1.1 years; 51 % female) completed self-report questionnaires. After accounting for peer and parental substance use, children’s media-related cognitions were independently associated with three outcomes: preferences for alcohol-branded merchandise, moral beliefs about underage alcohol and tobacco use, and intentions to use alcohol and tobacco. Children’s perceptions of the desirability and realism of alcohol and tobacco ads—and their similarity to and identification with these ads—predicted greater intentions to use. Desirability and identification with alcohol and tobacco ads were associated with stronger preferences for alcohol-branded merchandise, and understanding advertising’s persuasive intent predicted weaker preferences. Media deconstruction skills predicted stronger beliefs that underage alcohol and tobacco use is wrong. Peer and parental substance use were associated with stronger substance-use intentions among children and weaker feelings that substance use is wrong. The findings highlight the role of media influence in contributing to youth substance use and the potential role of media literacy education in the early prevention of substance use. 相似文献
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This article is written as a response to the Martindale et al. critique of the Ackerman and Pritzl (2011) child custody evaluation practices article. The Martindale et al. critique focuses on a small portion of the overall results regarding test usage and suggests that the entire article is “flawed and deficient.” However, their critique engages in confirmatory bias and exaggerated statements and ignores the overall value of the article in general. A more broad‐based explanation of the results is provided herein. 相似文献
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DenYelle Baete Kenyon Lela A. Rankin Susan Silverberg Koerner Renée Peltz Dennison 《Journal of youth and adolescence》2007,36(6):813-823
The present study examined conceptions of “what makes an adult” within a sample of adolescents (13–19 years) from divorced
families. Arnett’s (2003) seven criteria-of-adulthood categories (independence, interdependence, role transitions, norm compliance,
biological transitions, chronological transitions, and family capacities) were used as an initial framework for grouping open-ended
written responses, while inductive content analysis was employed to analyze all other responses. Although the majority of
responses (N=568) fit into Arnett’s categories, 35.2% of responses were coded into eleven newly created categories (e.g., knowledge/wisdom,
role model/leader). The present study confirmed that independence qualities are believed to be most important. However, role
transitions (e.g., marriage) were considered more significant than in previous research. The qualitative findings and their
specific pattern should inform existing quantitative measures of adulthood criteria.
Doctoral Student at the University of Arizona. She received her MS in Family Studies and Human Development from the University
of Arizona. Her major research interests include parent–adolescent relationships, adolescent development, and the transition
to adulthood.
Doctoral Student at the University of Arizona. She received her MS in Family Studies and Human Development from the University
of Arizona. Her major research interests include adolescent social development; adolescent romantic relationships and risk-taking
behaviors; psychological approaches to the transition to adulthood; and developmental methods and statistics
Associate Professor at the University of Arizona. She received her Ph.D. in Child and Family Studies from University of Wisconsin–Madison.
Her major research interests include post-divorce parent–adolescent relationship, adolescent development and adjustment, and
psychological/physical well-being of adults caring for elderly family members
Doctoral Student at the University of Arizona. She received her MS in Family Studies and Human Development from the University
of Arizona. Her major research interests include parental divorce and its impact on adolescents’ future relationships, adolescent
development, and mixed methodology 相似文献