Backpacking Brothers: An Experiential, Adventure Education Program to Transform Rape Culture and Prevent Sexual Violence

Sexual violence is a public health crisis in the United States and globally, that has devastating interpersonal, social, psychological, spiritual and economic impacts. The root causes of sexual violence are tied to all forms of oppression. The normalization and perpetuation of sexual violence is buttressed by cultural paradigms used by media, religion, education and other systems that maintain rigid gender roles and power dynamics. There are promising initiatives for preventing sexual violence before it occurs. This paper explores one of those initiatives called Backpacking Brothers. The purpose of Backpacking Brothers is to engage middle school boys in an adventure education program aimed to address attitudes, beliefs and actions that uphold and perpetuate sexual violence. Through experiential, liberatory education the program strives to transform rape culture, a form of cultural violence that creates an environment that allows sexual violence to thrive. The paper explores the newly created programming through the lens of a trainer, highlighting important learnings about principles and theories of primary prevention, experiential and social justice education, innovative training design, and evaluation of programming. It offers practical examples, resources, lessons learned and guideposts for social justice educators and trainers to understand and dismantle rape culture and prevent sexual violence

The Acidic Domains of the Toc159 Chloroplast Preprotein Receptor Family are Instrinsically Disordered Protein Domains

Background: The Toc159 family of proteins serve as receptors for chloroplast-destined preproteins. They directly bind to transit peptides, and exhibit preprotein substrate selectivity conferred by an unknown mechanism. The Toc159 receptors each include three domains: C-terminal membrane, central GTPase, and N-terminal acidic (A-) domains. Although the function(s) of the A-domain remains largely unknown, the amino acid sequences are most variable within these domains, suggesting they may contribute to the functional specificity of the receptors. Results: The physicochemical properties of the A-domains are characteristic of intrinsically disordered proteins (IDPs). Using CD spectroscopy we show that the A-domains of two Arabidopsis Toc159 family members (atToc132 and atToc159) are disordered at physiological pH and temperature and undergo conformational changes at temperature and pH extremes that are characteristic of IDPs. Conclusions: Identification of the A-domains as IDPs will be important for determining their precise function(s), and suggests a role in protein-protein interactions, which may explain how these proteins serve as receptors for such a wide variety of preprotein substrates

Evaluation of Probabilistic Methodology for Predicting Satellite Tracking Resources

This research evaluates a probabilistic methodology for estimating the ability of satellite tracking networks to provide tracking and data acquisition services to large constellations of satellites. This approach, developed by Hagar is evaluated using Monte Carlo simulations of optimal satellite contact scheduling on a tracking network for a certain class of satellites. The actual results of the scheduled Monte Carlo simulations were then compared to the predicted values computed with Hagar\u27s methodology for a range constellation and network sizes. Comparison methods include percent difference, a Wilcoxon signed ranks test and a Mann-Whitney U test. The Monte Carlo simulations were run for only low earth orbit (LEO) satellites in circular orbit at random altitudes ranging from 180km to 1000km, and inclinations from near equatorial to near polar. For each Monte Carlo sample the orbit plane orientations and initial satellite positions were randomly generated. Ninety-six different cases were simulated and compared to their respective counterparts using the probabilistic approach. The results indicate that the probabilistic method is not finished. Although the method is fair in its approximation of network capabilities it lacks the accuracy to be used as a single tool for analysis of network capabilities. With additional research and adjustment the method could give satellite network users and planners a useful tool for predicting the ability of tracking and data acquisition networks to meet current and projected satellite tracking needs

Spin-induced symmetry breaking in orbitally ordered NiCr_2O_4 and CuCr_2O_4

At room temperature, the normal oxide spinels NiCr_2O_4 and CuCr_2O_4 are tetragonally distorted and crystallize in the I4_1/amd space group due to cooperative Jahn-Teller ordering driven by the orbital degeneracy of tetrahedral Ni$^{2+}$ ($t_2^4$) and Cu$^{2+}$ ($t_2^5$). Upon cooling, these compounds undergo magnetic ordering transitions; interactions being somewhat frustrated for NiCr_2O_4 but not for CuCr_2O_4. We employ variable-temperature high-resolution synchrotron X-ray powder diffraction to establish that at the magnetic ordering temperatures there are further structural changes, which result in both compounds distorting to an orthorhombic structure consistent with the Fddd space group. NiCr_2O_4 exhibits additional distortion, likely within the same space group, at a yet-lower transition temperature of $T$ = 30 K. The tetragonal to orthorhombic structural transition in these compounds appears to primarily involve changes in NiO_4 and CuO_4 tetrahedra

Basic calculation proficiency and mathematics achievement in elementary school children

The relation between skill in simple addition and subtraction and more general math achievement in elementary school is well established but not understood. Both the intrinsic importance of skill in simple calculation for math and the influence of conceptual knowledge and cognitive factors (working memory, processing speed, oral language) on simple calculation and math are plausible. The authors investigated the development of basic calculation fluency and its relations to math achievement and other factors by tracking a group of 259 United Kingdom English children from second to third grade. In both grades the group did not retrieve the solutions to most problems, but their math achievement was typical. Improvement in basic calculation proficiency was partially predicted by conceptual knowledge and cognitive factors. These factors only partially mediated the relation between basic calculation and math achievement. The relation between reading and math was wholly mediated by number measures and cognitive factors