A small-scale response of urban bat activity to tree cover

Urban Ecosystems - Bats in urban areas depend on trees, and bat activity increases with tree cover. To effectively manage bat habitat in cities, it is important to know the distance to which tree...     

Examining gender differences in the relationship between dating violence victimization and anger in college students

It has been well established that dating violence victimization is associated with various mental health problems. Relatively, little is known about similarities and differences between mental health correlates of dating violence victimization for males and females. We examined the associations between physical and psychological victimization experiences and measures of anger in a sample of 200 male and female undergraduates. Results suggest that men's victimization was more strongly associated with different forms of anger than women's victimization.     

Which factors explain the decline in infant and child mortality in Matlab,Bangladesh?

Infant and child mortality rates have decreased substantially in Matlab, Bangladesh, as they have in many developing areas. We use data from the Matlab Demographic Surveillance System on nearly 94,000 singleton live births that occurred between 1987 and 2002 to investigate the extent to which the change in mortality over this period can be explained by changes in reproductive patterns and socio-economic characteristics. We estimate Cox proportional hazards models for four subperiods of infancy and childhood. Changes over time in reproductive patterns (maternal age, parity, and pregnancy spacing) and in the socio-economic characteristics we consider (e.g. maternal education, SES) explain between 10 and 40% of the decline in mortality rates. Changes in maternal education explain the largest portion of the reduction in infant and child mortality over time that we are able to explain, followed by reductions in the incidence of short interpregnancy intervals. In the other direction, decreases in fertility over time led to increases in the proportion of births that were first births, putting upward pressure on mortality.

Friends First? The Peer Network Origins of Adolescent Dating

The proximity of dating partners in peer friendship networks has important implications for the diffusion of health‐risk behaviors and adolescent social development. We derive two competing hypotheses for the friendship–romance association. The first predicts that daters are proximally positioned in friendship networks prior to dating and that opposite‐gender friends are likely to transition to dating. The second predicts that dating typically crosses group boundaries and opposite‐gender friends are unlikely to later date. We test these hypotheses with longitudinal friendship data for 626 ninth‐grade PROSPER heterosexual dating couples. Results primarily support the second hypothesis: Romantic partners are unlikely to be friends in the previous year or share the same cohesive subgroup, and opposite‐gender friends are unlikely to transition to dating.     

Sustainability Assessment and Reporting for Nonprofit Organizations: Accountability “for the Public Good”

Nonprofit organizations serve the public good by offering services that benefit communities and the individuals who live in them. While many large for-profit companies and a few international nonprofits have begun voluntarily assessing and reporting their environmental, cultural, economic, and social sustainability performance in response to growing public awareness of sustainability issues, nonprofit organizations have generally been slow to adopt the practice. This paper makes the case that nonprofits have an obligation to assess and report sustainability performance to account for their positive and negative environmental, cultural, economic, and social impacts in the communities they serve precisely because of their promise to serve the public good; and that sustainability assessment and reporting are not only possible, but that they can actually offer several practical advantages for organizations that integrate the practice into their missions and models. Several sustainability reporting frameworks are reviewed. Two case examples are presented to illustrate the utility of sustainability assessments and reports for different types and sizes of nonprofit organizations. Challenges to the process of adoption and implementation of sustainability programs in the nonprofit sector are discussed.     

Certified organic agriculture in Mexico: Market connections and certification practices in large and small producers

Certification within organic agriculture exhibits flexibility with respect to practices used to demonstrate that a product meets published quality standards. This case study of Mexican certified-organic agriculture finds two forms. Indigenous smallholders of southern Mexico undertake a low-input, process-oriented organic farming in which certification is based upon extensive document review, group inspections, and assessment of on-farm capacity to produce organic inputs. More recently, northern Mexican large agribusiness producers have implemented certifications based upon laboratory testing and assessment of purchased inputs. To specify these differences, this article examines large and small producers in Mexico's organic agriculture sector based on a diagnostic census of Mexican organic agriculture in 668 production zones and field surveys in 256 production zones in which 28 indicators were analyzed. After comparing the organic cultivation and certification practices of large, agro-industrial, input-oriented private firms versus small, cooperatively organized, indigenous and peasant groups, we analyze the implications of this duality for certification frameworks. We argue (with Raynolds, L., 2004. The globalization of organic agro-food networks. World Development 32(5), 725–743; Gonzalez A.A., and Nigh, R., 2005. Smallholder participation and certification of organic farm products in Mexico. Journal of Rural Studies; DeLind, L., 2000. Transforming organic agriculture into industrial organic products: reconsidering national organic standards. Human Organization 59(2), 198–208) that the increasing bureaucratic requirements of international organic certification privilege large farmers and agribusiness-style organic cultivation and present the possibility of a new entrenchment of socio-spatial inequality in Mexico. While organic and fair trade agriculture has been touted as an income-generating production strategy for small producers of the Global South, our study suggests that Mexican organic agriculture reproduces existing social inequalities between large and small producers in conventional Mexican agriculture.     

Bidirectional relations between internalizing symptoms and peer victimization in late childhood

The present study investigated bidirectional relations between peer victimization and internalizing symptoms, with a focus on three forms of victimization (physical, verbal, relational) and two types of internalizing symptoms (depressive, anxious). In the fall and spring, children (N = 1,264–1,402 fourth and fifth graders depending on time point and data source) reported on their victimization, and teachers reported on children’s depressive and anxious symptoms. In a model including the broad constructs of victimization and internalizing symptoms, bidirectional relations emerged, with earlier victimization predicting increases in later internalizing symptoms and earlier internalizing symptoms predicting increases in later victimization. These bidirectional relations did not hold in two additional models, the first of which included the three forms of victimization and internalizing symptoms and the second of which included victimization and the two types of internalizing symptoms. Rather, results of the first model suggested that earlier internalizing symptoms predicted later physical, verbal, and relational (marginal) victimization, and the second model did not fit the data well. Findings are discussed in terms of implications of bidirectional relations between victimization and internalizing symptoms.     

Detecting T cell activation using a varying dimension Bayesian model

The detection of T cell activation is critical in many immunological assays. However, detecting T cell activation in live tissues remains a challenge due to highly noisy data. We developed a Bayesian probabilistic model to identify T cell activation based on calcium flux, a increase in intracellular calcium concentration that occurs during T cell activation. Because a T cell has unknown number of flux events, the implementation of posterior inference requires trans-dimensional posterior simulation. The model is able to detect calcium flux events at the single cell level from simulated data, as well as from noisy biological data.