240 research outputs found

    The Longitudinal Relationship between Callous-Unemotional Traits and Exposure to Community Violence: Examining Primary and Secondary Psychopathy in Serious Adolescent Offenders

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    in youth, psychopathy is often represented by callous-unemotional traits, characterized by a lack of guilt and empathy. While justice-involved youth can exhibit such traits, less research has been done in adolescents than has been with adults in the justice system. Still, previous research supports that callous-unemotional traits in particular can predict higher risk for adverse outcomes and violent behavior in youth. Various vulnerabilities and experiences contribute to the development of callous-unemotional traits, and while some individuals with psychopathic traits are thought to have been born with an innate inability to feel empathy (primary psychopathy), others may experience psychological distress in response to trauma and emotionally desensitize to cope (secondary psychopathy). Prior research shows exposure to community violence, a common and chronic experience for justice-involved adolescents, is one such traumatic event associated with callous-unemotional traits, but there remains a need to better understand how these variables influence one another over time in serious adolescent offenders, and how aggressive behaviors may be affected. Information provided by male adolescent offenders in the Pathways to Desistance study was used to investigate 1) whether youth displayed differing patterns of psychological distress that may indicate primary and secondary pathways to callous-unemotional traits, 2) how exposure to community violence and callous-unemotional traits influence one another over time across youth with primary versus secondary pathways, and 3) whether there were differences in the associations between exposure to community violence, callous-unemotional traits, and violent offending in later adolescence/early adulthood across the primary versus secondary groups. Results from a latent profile analysis resulted in larger groups of youth with low and medium levels of psychological distress, and one small group of youth with uniquely high distress. a subsequent multigroup cross lag panel model incorporating the low and medium distress participants revealed differences in the associations between callous-unemotional traits and exposure to community violence as a function of distress level. Lastly, callous-unemotional traits did not predict later aggressive offending in either group, but exposure to community violence negatively predicted later aggressive offending for youth with higher distress levels. Results support the use of psychological distress levels to better understand the longitudinal associations between exposure to community violence and callous-unemotional traits, but did not indicate increased callous-unemotional traits or exposure to community violence could positively predict later violent offending. Future studies related to the development of psychopathic traits in youth should continue to further explore what types of distress specifically may increase vulnerability for youth developing callous-unemotional traits as a way to cope with adverse experiences. Clinically, connections between violence exposure and emotional desensitization should be utilized in trauma-informed therapies with adolescents involved in the justice system who are at high risk for trauma and distress

    Elizabeth Sargent to Mr. Meridth (4 October 1962)

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    https://egrove.olemiss.edu/mercorr_pro/1929/thumbnail.jp

    The Darker Side of Americas Wonderland A Study of the First Four Decades of Yellowstone National Park

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    Those who first stumbled across the steaming, bubbling land of Northwestern Wyoming in 1860s and early 1870s described it as “Hell on Earth.” Over the course of a few decades, the land underwent a vast transformation, which replaced “Hell” with “Wonderland” in visitors’ minds. The year 1872 represents a turning point in environmental legislation and marks the conception of Yellowstone, America’s first national park. While creating a national park preserved, for the first time, the country’s natural wonders, the 1872 act included no direction for management, no allocation of funds for upkeep, and no system set in place to manage tourists. This thesis examines the darker past of America’s Wonderland, demonstrating that the vagueness of the original act affected the first four decades of Yellowstone’s history for the worse, which led to a multitude of problems that plagued the park from 1872 to 1916, when the National Park Service was established. Through the examination of park superintendent reports, legislative acts, newspapers, and personal accounts, this thesis reveals the way political and commercial interests shaped Yellowstone’s first forty years. These documents tell of the difficulties of protecting a vast area with no laws and minimal funding. Poor management led to poaching, widespread vandalism and a lack of respect for park administration. Until the passage of the Lacy Act twenty-two years after the park’s creation Yellowstone lacked legal consequences for wrongdoers. Administration represents one of many areas in which the Department of the Interior failed in its understanding of a national park

    Introducing the Remote Mentoring of Undergraduate Research Students (ReMentURS) Workshop Series: Initial Evaluation and Plans for Wider Implementation

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    The primary objective of the Remote Mentoring of Undergraduate Research Students (ReMentURS) workshop series is to design a remotely available professional development training that will provide rigorous research concept and skills introduction to incoming undergraduate research students. This pilot run eight-week remote learning workshop series includes digital presentations, informational videos, virtual demonstrations, and aligned comprehension checks to foster student mindsets towards becoming independent research scientists. Preliminary assessment of the of ReMentURS program reveals that participants self-report gaining a variety of skills through the series and are likely to use the content in their future course and research laboratories. ReMentURS material can be shared with any undergraduate student who is interested in joining a research group to familiarize them with basic research techniques. Student learning gains will continue to be evaluated throughout the series and this initial assessment will be used towards the betterment of the future workshops

    Evidence for polyploidy in the globally important diazotroph Trichodesmium

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    Polyploidy is a well-described trait in some prokaryotic organisms; however, it is unusual in marine microbes from oligotrophic environments, which typically display a tendency towards genome streamlining. The biogeochemically significant diazotrophic cyanobacterium Trichodesmium is a potential exception. With a relatively large genome and a comparatively high proportion of non-protein-coding DNA, Trichodesmium appears to allocate relatively more resources to genetic material than closely related organisms and microbes within the same environment. Through simultaneous analysis of gene abundance and direct cell counts, we show for the first time that Trichodesmium spp. can also be highly polyploid, containing as many as 100 genome copies per cell in field-collected samples and >600 copies per cell in laboratory cultures. These findings have implications for the widespread use of the abundance of the nifH gene (encoding a subunit of the N2-fixing enzyme nitrogenase) as an approach for quantifying the abundance and distribution of marine diazotrophs. Moreover, polyploidy may combine with the unusual genomic characteristics of this genus both in reflecting evolutionary dynamics and influencing phenotypic plasticity and ecological resilience

    Disentangling protostellar evolutionary stages in clustered environments using Spitzer-IRS spectra and comprehensive SED modeling

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    When studying the evolutionary stages of protostars that form in clusters, the role of any intracluster medium cannot be neglected. High foreground extinction can lead to situations where young stellar objects (YSOs) appear to be in earlier evolutionary stages than they actually are, particularly when using simple criteria like spectral indices. To address this issue, we have assembled detailed SED characterizations of a sample of 56 Spitzer-identified candidate YSOs in the clusters NGC 2264 and IC 348. For these, we use spectra obtained with the Infrared Spectrograph onboard the Spitzer Space Telescope and ancillary multi-wavelength photometry. The primary aim is twofold: 1) to discuss the role of spectral features, particularly those due to ices and silicates, in determining a YSO's evolutionary stage, and 2) to perform comprehensive modeling of spectral energy distributions (SEDs) enhanced by the IRS data. The SEDs consist of ancillary optical-to-submillimeter multi-wavelength data as well as an accurate description of the 9.7 micron silicate feature and of the mid-infrared continuum derived from line-free parts of the IRS spectra. We find that using this approach, we can distinguish genuine protostars in the cluster from T Tauri stars masquerading as protostars due to external foreground extinction. Our results underline the importance of photometric data in the far-infrared/submillimeter wavelength range, at sufficiently high angular resolution to more accurately classify cluster members. Such observations are becoming possible now with the advent of the Herschel Space Observatory.Comment: Accepted for publication in Ap

    Analyzing white dwarf + white dwarf binaries with Gaia trigonometric parallaxes

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    White dwarfs (WDs) have been used as chronometers to age date the solar neighborhood, open clusters, globular clusters, and even the Galactic halo field population. The availability of highly accurate and precise Gaia trigonometric parallaxes along with nearly all-sky, homogenous photometric surveys (SDSS, Pan-STARRS) now allows us to improve the precision in WD ages. We report on the consistency of ages among seven WD+WD binaries, run through BASE-9 individually and in pairs. BASE-9 uses Bayesian analysis to estimate the values for stellar parameters, such as age, distance, and metallicity. We found that using Gaia\u27s parallaxes with binary systems constrains the errors in these estimations, by lowering uncertainties and constraining the ages and distances of the systems
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