Shifts in internal stem damage along a tropical precipitation gradient and implications for forest biomass estimation.

Woody biomass is a large carbon store in terrestrial ecosystems. In calculating biomass, tree stems are assumed to be solid structures. However, decomposer agents such as microbes and insects target stem heartwood, causing internal wood decay which is poorly quantified.

Nutritional supplementation to reduce child aggression: a randomized, stratified, single-blind, factorial trial.

Background: While some studies suggest that nutritional supplementation may reduce aggressive behavior in children, they have not examined whether its efficacy may be enhanced in conjunction with other treatment approaches. This study tests the hypothesis that a nutritional supplementation of omega-3, multivitamins, and minerals over 3 months, combined with cognitive behavior therapy, will reduce childhood aggression.

Methods: In this randomized, single-blind, stratified, factorial trial, a high-risk community sample of 290 children aged 11-12 years were randomized into Nutrition only, cognitive behavioral therapy (CBT) only, Nutrition + CBT, and Control groups.

Neighborhood blight, stress, and health: a walking trial of urban greening and ambulatory heart rate.

We measured dynamic stress responses using ambulatory heart rate monitoring as participants in Philadelphia, Pennsylvania walked past vacant lots before and after a greening remediation treatment of randomly selected lots. Being in view of a greened vacant lot decreased heart rate significantly more than did being in view of a nongreened vacant lot or not in view of any vacant lot. Remediating neighborhood blight may reduce stress and improve health.

Evaluating the effect of state regulation of federally licensed firearm dealers on firearm homicide.

Effective federal regulation of firearm dealers has proven difficult. Consequently, many states choose to implement their own regulations. We examined the impact of state-required licensing, record keeping of sales, allowable inspections, and mandatory theft reporting on firearm homicide from 1995 to 2010.

The Healthy Brains and Behavior Study: objectives, design, recruitment, and population coverage.

Violence is increasingly viewed as a public health issue that may be ameliorated by health-based interventions. The Healthy Brains and Behavior Study (HBBS) aims to identify environmental and biological risk factors for aggression in late childhood and to reduce aggression through psychological and nutritional treatments. Utilizing a cross-disciplinary collaborative research approach, the HBBS has both human and animal components.

A difference-in-differences analysis of health, safety, and greening vacant urban space.

Greening of vacant urban land may affect health and safety. The authors conducted a decade-long difference-in-differences analysis of the impact of a vacant lot greening program in Philadelphia, Pennsylvania, on health and safety outcomes. "Before" and "after" outcome differences among treated vacant lots were compared with matched groups of control vacant lots that were eligible but did not receive treatment.

Religious social capital: its measurement and utility in the study of the social determinants of health.

As a social determinant of health, religiosity remains not well understood, despite the prevalence of religious activity and prominence of religious institutions in most societies. This paper introduces a working measure of Religious Social Capital and presents preliminary associations with neighborhood social capital and urban stressors. Religious social capital is defined as the social resources available to individuals and groups through their social connections with a religious community.

Reducing firearm violence: a research agenda.

In the United States, firearms are involved in tens of thousands of deaths and injuries each year. The magnitude of this problem prompted the National Academy of Sciences (NAS) to issue a report in 2004 detailing the strengths and limitations of existing research on the relationship between firearms and violence. In response, a multidisciplinary group of experts in the field of firearms and violence formed the National Research Collaborative on Firearm Violence.

The case for enhanced data collection of gun type.

Background: National surveillance systems have differentiated long guns into rifles and shotguns but fail to do so for handgun type. We sought to determine whether specific gun type data could be collected and whether knowledge of specific gun types (rifle, shotgun, pistol, revolver) could be used to distinguish gun homicide victims with respect to important injury parameters such as number of wounds.

Methods: Data on gun fatalities over a 5-year period in three communities were abstracted from medical examiner/coroner, police, and crime laboratory records.

Effective trauma center partnerships to address firearm injury: a new paradigm.

Background: Firearm violence is the second leading cause of injury-related death. This study examined the use of local trauma centers as lead organizations in their communities to address firearm injury.

Methods: Three trauma centers in cities with populations less than 100,000 were linked with a university-based firearm injury research center.