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On the basis of discussion and analysis during and following an ATSDR science panel on the bioavailability of mercury in soils, it is apparent that the default assumption of 100% relative bioavailability for mercury-contaminated soils is excessively conservative. However, current knowledge does not allow the development of default assumptions or guidelines for determining relative bioavailability of mercury in soils. Until such default assumptions or guidelines can be developed, site-specific assays of bioavailability, preferably using either animal bioassays or validated in vitro techniques, may provide the best approach for estimating soil-mercury bioavailability. 相似文献
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The United States is entering a new era, a period marked by some important demographic changes in the composition of the population, most especially significant increases in the Latino and Latino immigrant segments of society. These population shifts require corresponding interpersonal, organizational, and structural changes. The present issue bridges research and theory across disciplines and includes studies incorporating a variety of methodologies to examine these important areas. These articles begin to fill some of the voids where a systematic and robust corpus of knowledge is lacking. The contributions address topics ranging from issues of identity and interpersonal relations to pressing matters of educational significance to general approaches to navigating the cultural transitions that mark fluid transnational adaptations. Finally, each contribution delineates the policy implications resulting from the processes and literatures that are examined. 相似文献
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Louise Ryan 《International migration (Geneva, Switzerland)》2019,57(3):177-191
Adopting a spatio‐temporal lens, this article explores how highly qualified migrant women negotiate relationships and career motivations in specific socio‐structural contexts. Comparing migration experiences of Irish and Polish women in London, I explore similarities within and differences between these groups. Having joined the EU in 1973, Ireland can be regarded as part of “old EU”, while Poland joining in 2004 is part of the “new” wave of EU members. Migration from old and new member states is often discussed separately using different framing. This article contributes to understanding migration in three ways. Firstly, by developing comparative analysis, which goes beyond narrow and static migrant categories. Secondly, by challenging the temporary/transient versus permanence/integration dichotomy to explore a “sliding scale” of migrant trajectories. Thirdly, by illustrating how evolving relationships, through the life cycle, may enable but also hinder migrant women's opportunities for settling in or moving on. 相似文献
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Ryan D. Edwards 《Demography》2018,55(2):403-434
Starting in 2006, respondents in the biennial U.S. Health and Retirement Study were asked to submit biomarkers every other wave and were notified of several results. Rates of undiagnosed high blood pressure and diabetes according to these biomarkers were 1.5 % and 0.7 %, respectively. An intent-to-treat analysis suggests that collection and notification had small effects on the average respondent and may have reduced health care utilization. Among respondents who received notification of potentially dangerous biomarker levels, subsequent rates of new diagnosis and associated pharmaceutical usage increased by 20 to 40 percentage points, an order of magnitude above baseline. High blood glucose A1C was associated with a 2.2 % drop in weight and an increase in exercise among respondents without a previous diagnosis of diabetes. Notifications appear also to have altered health behaviors by spouses, suggesting household responses to health maintenance. Biomarker collection seems to have altered circumstances for an interesting minority of HRS respondents. 相似文献