Urban transition toward food sovereignty

In cities throughout the world, people are taking steps to develop just, sustainable alternatives to the dominant food system. These initiatives pose questions which, to be answered, require new theoretical approaches. This study makes use of Marx's concepts of ‘social metabolism’ and ‘metabolic rift’, as well as Altvater's analysis of forms of capitalist appropriation, in order to understand how current society-nature relationships have given way to a socioeconomic spatial order which makes it difficult to develop just, sustainable food systems. From this theoretical framework, we identify and analyse some key aspects of the urban transition toward food sovereignty.     

On Bradman’s bat: Australian sporting heroes

The Australian way of life is claimed to be a celebration of sporting rather than intellectual achievement. The influence of sport for contemporary Australians is examined by asking a nationally representative sample of Australian adults to identify their most ‘influential’ sporting heroes. Men are far more likely than women to view male sporting heroes as influential with a similar pattern apparent for Liberal/National Party identifiers over other party supporters, although younger people are less likely than their older counterparts to nominate male sports stars. Cricket legend Donald Bradman’s iconic status transcends sport, signifying conservative, white, masculine elements of national identity.     

Advancing Risk‐Informed Decision Making in Managing Defense Nuclear Waste in the United States: Opportunities and Challenges for Risk Analysis

An omnibus spending bill in 2014 directed the Department of Energy to analyze how effectively Department of Energy (DOE) identifies, programs, and executes its plans to address public health and safety risks that remain as part of DOE's remaining environmental cleanup liabilities. A committee identified two dozen issues and associated recommendations for the DOE, other federal agencies, and the U.S. Congress to consider, as well as other stakeholders such as states and tribal nations. In regard to risk assessment, the committee described a risk review process that uses available data, expert experience, identifies major data gaps, permits input from key stakeholders, and creates an ordered set of risks based on what is known. Probabilistic risk assessments could be a follow‐up from these risk reviews. In regard to risk management, the states, in particular, have become major drivers of how resources are driven. States use different laws, different priorities, and challenge DOE's policies in different ways. Land use decisions vary, technology choices are different, and other notable variations are apparent. The cost differences associated with these differences are marked. The net result is that resources do not necessarily go to the most prominent human health and safety risks, as seen from the national level.     

Bayesian Hierarchical Structure for Quantifying Population Variability to Inform Probabilistic Health Risk Assessments

Human variability is a very important factor considered in human health risk assessment for protecting sensitive populations from chemical exposure. Traditionally, to account for this variability, an interhuman uncertainty factor is applied to lower the exposure limit. However, using a fixed uncertainty factor rather than probabilistically accounting for human variability can hardly support probabilistic risk assessment advocated by a number of researchers; new methods are needed to probabilistically quantify human population variability. We propose a Bayesian hierarchical model to quantify variability among different populations. This approach jointly characterizes the distribution of risk at background exposure and the sensitivity of response to exposure, which are commonly represented by model parameters. We demonstrate, through both an application to real data and a simulation study, that using the proposed hierarchical structure adequately characterizes variability across different populations.     

Does Asking Adolescents About Pornography Make Them Use It? A Test of the Question–Behavior Effect

Longitudinal survey design is the preferred method for the robust assessment of outcomes associated with socially undesirable or potentially harmful sexual behaviors. However, repeated measurement may induce the question–behavior effect (QBE)—the phenomenon where asking about a behavior changes the probability of engaging in the behavior in the future. Using an online panel sample of Croatian adolescents (M_{age at baseline} = 15.8, SD = .50), the present study explored the QBE in the context of adolescent pornography use. To this end we compared the frequency of pornography use six months after the initial survey (T2) between adolescents who participated in both baseline (T1) and T2 survey assessments (n = 1,053; 41% of males) and those who began the study at T2 (n = 130; 42% of males). In line with the findings from a recent Dutch study, we found no evidence that surveying adolescent pornography consumption increased participants’ reports of subsequent use. Implications of the findings for studying pornography use in young people are discussed.     

Quantitative Risk Assessment: Developing a Bayesian Approach to Dichotomous Dose–Response Uncertainty

Model averaging for dichotomous dose–response estimation is preferred to estimate the benchmark dose (BMD) from a single model, but challenges remain regarding implementing these methods for general analyses before model averaging is feasible to use in many risk assessment applications, and there is little work on Bayesian methods that include informative prior information for both the models and the parameters of the constituent models. This article introduces a novel approach that addresses many of the challenges seen while providing a fully Bayesian framework. Furthermore, in contrast to methods that use Monte Carlo Markov Chain, we approximate the posterior density using maximum a posteriori estimation. The approximation allows for an accurate and reproducible estimate while maintaining the speed of maximum likelihood, which is crucial in many applications such as processing massive high throughput data sets. We assess this method by applying it to empirical laboratory dose–response data and measuring the coverage of confidence limits for the BMD. We compare the coverage of this method to that of other approaches using the same set of models. Through the simulation study, the method is shown to be markedly superior to the traditional approach of selecting a single preferred model (e.g., from the U.S. EPA BMD software) for the analysis of dichotomous data and is comparable or superior to the other approaches.     

Dating Relationship Dynamics,Mental Health,and Dating Victimization: A Longitudinal Path Analysis

The purpose of this study was to assess the longitudinal association between adolescent dating relationship dynamics (measures of intimacy and problem dynamics), mental health, and physical and/or sexual victimization by a dating partner. Gender‐stratified analyses were conducted in a sample of 261 adolescents, ages 10–18 at baseline, interviewed in three annual waves (2013–2015) of the nationally representative Survey on Teen Relationships and Intimate Violence (STRiV). Among male daters, better mental health at baseline was negatively associated with problem dynamics at follow‐up, and aspects of problem dynamics at baseline predicted worse mental health at follow‐up. However, unexpectedly, aspects of relationship intimacy at baseline were also negatively associated with mental health at follow‐up. Male daters’ victimization did not mediate longitudinal measures of mental health or of relationship dynamics, but did predict worse mental health at follow‐up. Among female daters, we found no longitudinal associations between mental health and intimacy or problem relationship dynamics, in either direction. However, victimization mediated aspects of female daters’ reported relationship dynamics. Dating violence prevention efforts should reflect that adolescent females reporting controlling behaviors and feelings of passionate love may be at increased risk for victimization. Positive youth development efforts should attend to the bidirectional associations of mental health and dating relationship dynamics over time, particularly for male adolescents.     

Effects of acute androstenedione supplementation on testosterone levels in older men

The purpose of the study was to examine the effects of acute androstenedione supplementation on hormone levels in older men at rest and during exercise. Men (n?=?11) between the ages of 58 and 69 were divided into an experimental (n?=?6; 62.33?±?2.57 y) and control (n?=?5; 60.2?±?1.02 y) groups. Each participant received an oral 300?mg dose of either androstenedione (experimental) or a cellulose placebo (control) for 7 d. Pre- and post-supplementation participants completed two separate, 20-min strength tasks consisting of leg extension and leg curls at different percentages of their 10-RM. Researchers collected blood samples pre-, during, and post-exercise. Blood samples were analyzed for testosterone, androstenedione, and estradiol levels. The researchers found a significant difference between pre- (4.36?±?56?ng/mL) and post- (5.51?±?0.35?ng/mL) testosterone levels, as well as pre- (0.88?±?0.20) and post- (7.46?±?1.25) androstenedione levels, but no significant differences between pre- and post-estradiol levels for either group. It appears that short-term androstenedione supplementation augmented acute testosterone responses to resistance exercise in older men. However, further study of this supplement is needed to determine any potential it may have in mitigating andropause.