Water sources of urban trees in the Los Angeles metropolitan area

In semi-arid cities, urban trees are often irrigated, but may also utilize natural water sources such as groundwater. Consequently, the sources of water for urban tree transpiration may be uncertain, complicating efforts to efficiently manage water resources. We used a novel approach based on stable isotopes to determine tree water sources in the Los Angeles basin, where we hypothesized that trees would rely on irrigation water in the soil rather than develop deep roots to tap into groundwater. We evaluated the oxygen (δ¹⁸O) and hydrogen (δD) isotope ratios of xylem water, irrigation water, soil water, and groundwater in a study of temporal patterns in water sources at two urban sites, and a study of spatial patterns at nine urban sites and one “natural” riparian forest. Contrary to our hypothesis, we found that despite frequent irrigation, some trees tap into groundwater, although in most species this was a small water source. Some trees appeared to be using very shallow soil water at <30 cm depth, suggesting that these mature urban trees were quite shallowly rooted. In the natural site, trees appeared to be using urban runoff in addition to shallow soil water. We were able to identify tree uptake of precipitation at only 3 sites. The results show that some irrigated trees utilize groundwater and do not rely solely on irrigation water, which may make them able to withstand drought and/or water conservation measures. However, some irrigated trees may develop very shallow root systems, which may make them more susceptible.     

The Epistemic Culture of Homebrewers and Microbrewers

Homebrewing and microbrewing have been growing in popularity during the last few decades. One way this phenomenon can be analyzed is through the culture of knowledge production. We use the subfield of science and technology studies (STS) to examine homebrewing and microbrewing in this light. Early STS was interested in the social construction of scientific facts within daily practices of scientists. Through these early studies, STS revealed not only the process of scientific fact creation but also existence of “epistemic cultures.” Our study investigates the epistemic culture of homebrewers and microbrewers. Analysis of this epistemic culture was accomplished through use of in-depth interviews with homebrewers and microbrewers at several regional sites. Three major themes emerged from the data: home space as lab; the art and science of beer brewing; and brewing as “friendship”. These themes establish a foundation for understanding the shared epistemic culture existing between homebrewers and microbrewers.     

Developing an undue influence screening tool for Adult Protective Services

The study purpose was to develop and pilot an undue influence screening tool for California’s Adult Protective Services (APS) personnel based on the definition of undue influence enacted into California law January 1, 2014. Methods included four focus groups with APS providers (n = 33), piloting the preliminary tool by APS personnel (n = 15), and interviews with four elder abuse experts and two APS administrators. Social service literature—including existing undue influence models—was reviewed, as were existing screening and assessment tools. Using the information from these various sources, the California Undue Influence Screening Tool (CUIST) was developed. It can be applied to APS cases and potentially adapted for use by other professionals and for use in other states. Implementation of the tool into APS practice, policy, procedures, and training of personnel will depend on the initiative of APS management. Future work will need to address the reliability and validity of CUIST.     

Education and survival: Birth cohort,period, and age effects

Previous studies have found that educational differences in mortality are weaker among the elderly. In this study I examine whether either cohort or period effects may have influenced the interpretation of age effects. Six 10-year birth cohorts are followed over 30 years through decennial censuses. Differential survival is inferred from changes in the relative proportions of a cohort in each education category as the cohort ages. In cross-section, younger persons generally show stronger education effects on survival, although this pattern is clearer for women than for men. There is evidence of period effects. Within cohorts, relative survival tends to increase with age.     

Prevention of child abuse and neglect and improvements in child development

The aim of the study was to evaluate the implementation of a section in the Danish Social Assistance Act which encourages local authorities to offer families services in order to support children at risk of child maltreatment. The specific purpose of the present paper is to answer the question: Will the socio‐psychological development of children known to social services be improved when abuse and neglect are reduced? A sample of 1,138 children was drawn at random from new social services cases starting in 1998. Subsequently, about 80 per cent were evaluated by local caseworkers on the basis of a standardised questionnaire covering a period of four years. The most damaging family conditions seemed to be psychological maltreatment, physical/sexual abuse and neglect. Maltreated children were more often in a depressed state, unhappy, socially isolated, or they had an eating disorder, inadequate or under‐nutrition, suicidal tendencies, lack of concentration, or disturbed behaviour, compared to those children who were not exposed to abuse and neglect. If parental behaviour improved, effects on children's well‐being were also observed and positive changes in children's socio‐psychological development were identified. The questionnaire explored the impact of various interventions, including services geared to strengthen the child's network, but results indicated that the child displayed reduced risk of reactive symptoms only when parental behaviour improved and abuse and neglect were reduced. Copyright © 2009 John Wiley & Sons, Ltd.     

Developmental Trajectories of Emotion Regulation Across Infancy: Do Age and the Social Partner Influence Temporal Patterns

The ability to effectively regulate emotions is a critical component of early socio‐emotional development. This longitudinal study examined the developmental trajectories of emotion regulation in a sample of 3‐, 5‐, and 7‐month‐olds during an interaction with mothers and fathers. Infants' negative affect and use of behavioral strategies, including distraction, self‐soothing, and high intensity motor behaviors were rated during the still‐face episode of the Still‐Face Paradigm. Longitudinal mixed‐effects models were tested to determine whether strategies were followed by an increase or decrease in negative affect. Results from mother‐infant and father‐infant dyads indicated that focusing attention away from the unresponsive parent and engaging in self‐soothing behaviors were associated with a subsequent decline in negative affect and the strength of these temporal associations were stable across infancy. In contrast, high‐intensity motor behaviors were followed by an increase in negative affect and this effect declined over time. No significant effects were found for the behavioral strategy of looking at the parent. Results underscore the importance of considering infant age and the social partner when studying the effectiveness of emotion regulatory strategies in early infancy.     

Public sociability of college‐aged male homosexuals: The gay bar and cruise block

The young, overt, college‐aged male gay community (17 to 24 age group) is examined by focusing on its public sociability. The values of this community, its locale, and its youthful members give this study unique qualities and characteristics which are distinguished from other research efforts that have predominantly focused on sociability from the perspective of the large urban, secret middle‐class older gay community. Nearly all sociability among these young gays occurs at a gay bar. The various functions of the gay bar and its major facilitators of sociability (drugs and special events) are illustrated. In addition, the cruise block, primarily utilized for exchanges of conversation and secondarily for the seeking of impersonal sex, is analyzed.