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"Environmental Epidemiology"
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Differences in the carcinogenic evaluation of glyphosate between the International Agency for Research on Cancer (IARC) and the European Food Safety Authority (EFSA)
Serious flaws in the scientific evaluation in the RAR incorrectly characterise the potential for a carcinogenic hazard from exposure to glyphosate. Since the RAR is the basis for the European Food Safety Agency (EFSA) conclusion, 4 it is critical that these shortcomings are corrected. [...]the WG also saw a significant increase in the incidence of pancreatic islet cell adenomas in two studies in male Sprague-Dawley rats. 14-16 In one of these rat studies, thyroid gland adenomas in females and liver adenomas in males were also increased.
Journal Article
Lyme disease : the ecology of a complex system
A synthetic review of research on the ecology of Lyme disease in North America.
Book
Complex Mixtures, Complex Analyses: an Emphasis on Interpretable Results
Purpose of Review
The purpose of this review is to outline the main questions in environmental mixtures research and provide a non-technical explanation of novel or advanced methods to answer these questions.
Recent Findings
Machine learning techniques are now being incorporated into environmental mixture research to overcome issues with traditional methods. Though some methods perform well on specific tasks, no method consistently outperforms all others in complex mixture analyses, largely because different methods were developed to answer different research questions. We discuss four main questions in environmental mixtures research: (1) Are there specific exposure patterns in the study population? (2) Which are the toxic agents in the mixture? (3) Are mixture members acting synergistically? And, (4) what is the overall effect of the mixture?
Summary
We emphasize the importance of robust methods and interpretable results over predictive accuracy. We encourage collaboration with computer scientists, data scientists, and biostatisticians in future mixture method development.
Journal Article
Statistical Approaches for Investigating Periods of Susceptibility in Children’s Environmental Health Research
Purpose of Review
Children’s environmental health researchers are increasingly interested in identifying time intervals during which individuals are most susceptible to adverse impacts of environmental exposures. We review recent advances in methods for assessing susceptible periods.
Recent Findings
We identified three general classes of modeling approaches aimed at identifying susceptible periods in children’s environmental health research: multiple informant models, distributed lag models, and Bayesian approaches. Benefits over traditional regression modeling include the ability to formally test period effect differences, to incorporate highly time-resolved exposure data, or to address correlation among exposure periods or exposure mixtures.
Summary
Several statistical approaches exist for investigating periods of susceptibility. Assessment of susceptible periods would be advanced by additional basic biological research, further development of statistical methods to assess susceptibility to complex exposure mixtures, validation studies evaluating model assumptions, replication studies in different populations, and consideration of susceptible periods from before conception to disease onset.
Journal Article
Plague and empire in the early modern Mediterranean world : the Ottoman experience, 1347-1600
\"This is the first systematic scholarly study of the Ottoman experience of plague during the Black Death pandemic and the centuries that followed. Using a wealth of archival and narrative sources, including medical treatises, hagiographies, and travelers' accounts, as well as recent scientific research, Nèukhet Varlik demonstrates how plague interacted with the environmental, social, and political structures of the Ottoman Empire from the late medieval through the early modern era. The book argues that the empire's growth transformed the epidemiological patterns of plague by bringing diverse ecological zones into interaction and by intensifying the mobilities of exchange among both human and non-human agents. Varlik maintains that persistent plagues elicited new forms of cultural imagination and expression, as well as a new body of knowledge about the disease. In turn, this new consciousness sharpened the Ottoman administrative response to the plague, while contributing to the makings of an early modern state\"-- Provided by publisher.
Book
Lipid and Creatinine Adjustment to Evaluate Health Effects of Environmental Exposures
Purpose of Review
Urine- and serum-based biomarkers are useful for assessing individuals’ exposure to environmental factors. However, variations in urinary creatinine (a measure of dilution) or serum lipid levels, if not adequately corrected for, can directly impact biomarker concentrations and bias exposure-disease association measures.
Recent Findings
Recent methodological literature has considered the complex relationships between creatinine or serum lipid levels, exposure biomarkers, outcomes, and other potentially relevant factors using directed acyclic graphs and simulation studies. The optimal measures of urinary dilution and serum lipids have also been investigated.
Summary
Existing evidence supports the use of covariate-adjusted standardization plus creatinine adjustment for urinary biomarkers and standardization plus serum lipid adjustment for lipophilic, serum-based biomarkers. It is unclear which urinary dilution measure is best, but all serum lipid measures performed similarly. Future research should assess methods for pooled biomarkers and for studying diseases and exposures that affect creatinine or serum lipids directly.
Journal Article
The fluorspar mines of Newfoundland : their history and the epidemic of radiation lung cancer
John Martin tells the history of Newfoundland's fluorspar mines from their founding to the last shipment of fluorspar in 1990 and declaration of bankruptcy a year later. He focuses on the health hazards experienced by the miners, and how the mining companies, workers, governments, and health services came to terms with the unfolding human tragedy. He also covers such matters as the improvement of methods for dust quantification and radiation surveillance in the mines, battles for compensation, and the influence of the St Lawrence case on the development of labour law in the province.
Book
Biomonitoring and Nonpersistent Chemicals—Understanding and Addressing Variability and Exposure Misclassification
Purpose of Review
We offer here a review of intraindividual variability in urinary biomarkers for assessing exposure to nonpersistent chemicals. We provide thoughts on how to better evaluate exposure to nonpersistent chemicals.
Recent Findings
We summarized reported values of intraclass correlation coefficients and found that most values fall into categories that indicate only poor to good reproducibility. Even within the “good” classification, a large percentage of study participants is likely to be misclassified as to their exposure.
Summary
There is sufficient information to support the statement that studies using only one spot measurement of a nonpersistent chemical will be unreliable. It is unequivocal that multiple samples have to be collected over a period of toxicological relevance and with consideration of exposure patterns. Sponsors of research and researchers themselves should be vocal about ensuring that sufficient resources are made available to properly characterize exposures when studying nonpersistent chemicals. Otherwise, we will continue to see an ever-growing body of literature yielding inconsistent and/or uninterpretable results.
Journal Article