Children''s Exposure to Arsenic from CCA-Treated Wooden Decks and Playground Structures

CCA-treated wood is widely used in the fabrication of outdoor decks and playground equipment. Because arsenic can be removed from the surface of CCA-treated wood both by physical contact and by leaching, it is important to determine whether children who play on such structures may ingest arsenic in quantities sufficient to be of public health concern. Based on a review of existing studies, it is estimated that arsenic doses in amounts of tens of micrograms per day may be incurred by children having realistic levels of exposure to CCA-treated decks and playground structures. The most important exposure pathway appears to be oral ingestion of arsenic that is first dislodged from the wood by direct hand contact, then transferred to the mouth by children's hand-to-mouth activity. The next most important pathway appears to be dermal absorption of arsenic, while ingestion of soil that has become contaminated by leaching from CCA-treated structures appears to be of lesser importance, except possibly in the case of children with pica. Considerable uncertainty, however, is associated with quantitative estimates of children's arsenic exposure from CCA-treated wood. Priorities for refining estimates of arsenic dose include detailed studies of the hand-to-mouth transfer of arsenic, studies of the dermal and gastrointestinal absorption of dislodgeable arsenic, and studies in which doses of arsenic to children playing in contact with CCA-treated wood are directly determined by measurement of arsenic in their urine, hair, and nails.     

Resistance training is linked to heightened positive motivational state and lower negative affect among healthy women aged 65–70

Resistance training (RT) improves overall health, but the psychological effects of RT in healthy old adults have not been tested. The aim of this study was to investigate a sample of 65–70-year-old healthy and physically active women to assess their sense of coherence, health-related quality of life, hope, and affect, before and after taking part in a 24-week RT intervention (N = 14), compared to controls (N = 18). Findings showed a significant increase in hope (p = 0.013) and a significant decrease in negative affect (p = 0.002). Starting RT after age 65 does not appear to negatively impact on women’s psychological health but seems to be associated with important psychological health benefits.     

A comparison of stepwise common singular spectrum analysis and horizontal multi-channel singular spectrum analysis

The problem of forecasting a time series by using information provided by a second time series is considered. Two multivariate extensions of Singular Spectrum Analysis (SSA) are compared in terms of forecast error: Horizontal Multi-channel SSA and Stepwise Common SSA. Different signal structures, defined in terms of trend, period, amplitude and phase, are investigated. In broad terms we find that neither Horizontal Multichannel SSA nor Stepwise Common SSA is best in all cases. Horizontal MSSA is outperformed particularly in cases where different trends are considered.     

Declining employment success of immigrant males in Sweden: Observed or unobserved characteristics?

Focusing on Nordic and Yugoslavian immigrant males, we study the determinants of employment success of natives and immigrants in Sweden. Furthermore, we investigate the reasons behind the arising gap in employment success between Swedes and immigrants from 1970 to 1990. In a decomposition analysis, we find that the main part of the decline in the employment probability of immigrants relative to Swedes over time is explained by a change in coefficients (unobserved characteristics) rather than a change in determinants (observed characteristics). Received: 22 June 1998/Accepted: 23 March 2000     

Abhängigkeitserkrankung am Arbeitsplatz — eine Coachingaufgabe

Addiction on the job — a task of coaching The article describes the typical appearances and developments of addiction on the job, intending to show which multiple demands a manager has to fulfil, if he wants to handle the situation competent. It also describes possible solutions as well as the approach and routines of coaching in such a case.     

Expertization of Everyone and the Revolt of the Client*†

American society is witnessing a dramatic explosion and dissemination of knowledge, accompanied by the increasing refusal of patients, customers, students, and other types of clients to passively receive the services of the expert in any body of knowledge or skill. There has been an expansive growth of occupational experts and a demand on the part of clients for a change in the relation. Knowledge monopolization is decreasingly possible due to the activities of mass communication and of the literate public, and clients are becoming varied in the amount of knowledge with which they turn to the expert. Thus, while the political and economic groups are increasingly depending on the expert elite for plans and programs, the members at all levels of society are demanding rights of decision making.     

Prosperity-Enhancing Institutions: Towards a Comprehensive Composite Index

Institutions that potentially have a positive impact on economic performance rarely exist outside of a system of institutions; rather they are embedded in the institutional order of a country. It is thus imperative to investigate the composition of such prosperity-enhancing institutional orders. This paper proposes a measurement of bundles of institutions that channel the positive effect of democratic institutions on economic prosperity. We construct composite sub-indices measuring the political, economic and societal institutional quality as well as an overall index combining these bundles of institutions. Index data is available for 148 countries between 1995 and 2010. We obtain scores summarizing the level of prosperity-enhancing institutions that the respective countries exhibit with regard to their overall institutional setting and to the three bundles of institutions, and we grade the countries accordingly. Since the indices allow for inter-temporal comparisons, we can highlight a country’s achievements in institutional development, amongst other aspects of country comparisons, and we show their value as a tool in the analysis of determinants of economic prosperity. The proposed indices are a step towards a more systematic international comparison of democratic institutional settings.     

“Did I just do that?”—Six-month-olds learn the contingency between their vocalizations and a visual reward in 5 minutes

It has been shown that infants can increase or modify a motorically available behavior such as sucking, kicking, arm waving, etc., in response to a positive visual reinforcement (e.g., DeCasper & Fifer, 1980; Millar, 1990; Rochat & Striano, 1999; Rovee-Collier, 1997; Watson & Ramey, 1972). We tested infants to determine if they would also change their vocal behavior in response to contingent feedback, which lacks the social, emotional, and auditory modeling typical of parent-child interaction. Here, we show that in a single five-minute session infants increase the rate of their vocalizations in order to control the appearance of colorful shapes on an iPad screen. This is the first experimental study to demonstrate that infants can rapidly learn to increase their vocalizations, when given positive reinforcement with no social element. This work sets the foundations for future studies into the causal relationship between the number of early vocalizations and the onset of words. In addition, there are potential clinical applications for reinforcing vocal practice in infant populations who are at risk for poor language skills.