SciCombinator

Discover the most talked about and latest scientific content & concepts.

Journal: Environmental health and toxicology

161

Potential environmental risks caused by chemicals that could be released from a recycled plastic product were assessed using a screening risk assessment procedure for chemicals in recycled products.

Concepts: Assessment, Probabilistic risk assessment, Environmentalism, Risk assessment, Risk management, Risk

15

A method of rapidly decaying livestock carcasses is sought through Corine glutamicum, and furthermore, lysosomes are used to remove toxic microorganisms from livestock carcasses. The landfill was constructed on a laboratory scale. Optimized growth conditions of C. glutamicum that could quickly decay livestock carcasses were determined. Lysosomes were extracted from egg whites and used to treat contaminated soil to confirm their antimicrobial activities. Condition of C. glutamicum was activated, regardless both anaerobic and aerobic conditions, soil exists and, to be close to the optimum conditions as possible temperatures, moisture content was about 1/10 of the culture. Lysosomes were found to be effective in clearing soil contamination. C. glutamicum can accelerate the decay of livestock carcasses. A combination of C. glutamicum and lysomes could be used to treat soil contamination caused by decomposition of livestock.

10

The committee of the United Nations for the Evaluation of Radiation Effects UNSCEAR as well as the International Commission on Radiological Protection ICRP up to now have derived a very low risk for hereditary diseases in humans from experiments in mice. They claim that there are no human data to refer to, and missing effects in the acute exposed Japanese A-bomb survivors are erroneously generalized to situations of chronic exposure. We made a compilation of findings about early deaths, congenital malformations, Downs syndrome, cancer and other effects, which were observed in humans after the exposure of parents. A few pointers are available from occupationally exposed groups, and much information can be drawn from studies in populations exposed by Chernobyl fallout and from the descendants of liquidators. Nearly all types of hereditary defects were found, which are to be expected ac-cording to our general knowledge of mechanism. We show that the official risk estimates are much too low.

Concepts: Congenital, Congenital disorder, Disease, Radiation poisoning, Radiation, Nuclear weapon, Cancer, United Nations

0

Studies on the trend of air pollution in Tehran as one of the most polluted metropolis in the world are scant, and today Tehran is known for its high levels of air pollution. In this study, the trend of air pollution concentration was evaluated over the past 10 years (2004-2015). The data were collected from 22 stations of the Air Quality Control Company. Daily concentrations of CO, NO2, SO2, O3, PM10 were analyzed using SPSS 16 based on the statistical method, repeated measures, and intra-group test to determine the pattern of each pollutant changes. As a result of the 22 air pollution monitoring stations, NO2 and SO2 concentrations have been increasing over the period of 10 years. The highest anomaly is related to SO2. The CO concentrations represent a descending pattern over the period, although there was a slight increase in 2013 and 2014. The ozone concentrations declined in the following years. The average concentration of PM10 has been rising during the period. Also we evaluated changes of each pollutant in different months and calculated the number of clean, healthy, unhealthy days for sensitive, unhealthy, very unhealthy, and dangerous groups. The study findings illustrated the necessity for larger investment in air pollution abatement. Over ally, trends have been progressed to worsening, the number of healthy days has been declined and the number of unhealthy days has been increased in recent years.

0

Several epidemiological studies have reported an association between environmental pollution and various health conditions in individuals residing in industrial complexes. To evaluate the effects of pollution from industrial complex on human health, we performed a pooled analysis of environmental epidemiologic monitoring data for residents living near national industrial complexes in Korea. The respiratory and allergic symptoms and the prevalence of acute and chronic diseases, including cancer, were used as the outcome variables for health effects. Multiple logistic regression analysis was used to analyze the relationship between exposure to pollution from industrial complexes and health conditions. After adjusting for age, sex, smoking status, occupational exposure, level of education, and body mass index, the residents near the industrial complexes were found to have more respiratory symptoms, such as cough (OR = 1.18, 95% CI = 1.06-1.31) and sputum production (OR = 1.13, 95% CI = 1.03-1.24), and symptoms of atopic dermatitis (OR = 1.10, 95% CI = 1.01-1.21). Among residents of the industrial complexes, the prevalence of acute eye disorders was approximately 40% higher (OR = 1.39, 95% CI = 1.04-1.84) and the prevalence of lung and uterine cancer was 3.45 times and 1.88 times higher, respectively, than those among residents of the control area. This study showed that residents living in the vicinity of industrial complexes have a high risk of acute and chronic diseases including respiratory and allergic conditions. These results can be used as basic objective data for developing health management measures for individuals residing near industrial complexes.

Concepts: Toxicology, Medicine, Allergy, Regression analysis, Disease, Logistic regression, Asthma, Epidemiology

0

Radon, the primary constituent of natural radiation, is the second leading environmental cause of lung cancer after smoking. To confirm a relationship between indoor radon exposure and lung cancer, estimating cumulative levels of exposure to indoor radon for an individual or population is necessary. This study sought to develop a model for estimate indoor radon concentrations in Korea. Especially, our model and method may have wider application to other residences, not to specific site, and can be used in situations where actual measurements for input variables are lacking.

Concepts: Cancer staging, Background radiation, Mathematics, Tobacco smoking, Ionizing radiation, Cancer, Lung cancer, Radon

0

The purpose of this study is to introduce the establishment process, policy target, and projects for “Chungnam’s master plan on environmental health policy (2017-2020)” as the local government’s role in addressing local environmental health challenges. We first analyzed existing studies and social issues on the media related to “Chungnam’s master plan” to understand Chungnam’s environmental health status and discussed domestic and international policy trends and related plans. An environmental health perception questionnaire survey and a Delphi expert questionnaire survey were conducted among provincial residents to collect various actors' opinions on Chungnam’s environmental health issues and policy. An expert advisory panel was launched, and a residents' voice workshop and cities-and-guns-policy-suggestion workshop were held. The vision of Chungnam’s environmental health policy is minimizing environmental hazards. We finally selected “Pleasant environment, healthy people, happy Chungnam” to represent the will to shape a pleasant environment and prevent and manage health damages for a happy Chungnam. We selected five strategies based on status analysis and a review of domestic and international policy trends and related plans and identified 2 targets (policy objectives) to accomplish the strategies. The strategies to achieve the first target, “Leader in environmental health policy: Chungnam,” include “Empowering active provincial capabilities,” “Setting up province-specific systems for environmental health surveys and research,” and “Preventing and managing newly emerging pollutants.” The strategies for the second target, “Everyone is healthy: Chungnam,” include “Relieving health inequalities among vulnerable regions and residents” and “Enlarging the resident-friendly environmental health policy.” We developed 29 projects in total, according to these strategies. The establishment of “Chungnam’s master plan” is highly valuable; we developed it through discussion involving diverse actors to address environmental health challenges together. It is necessary to continue to strengthen participation, communication, and cooperation among actors to develop an environmental health policy model for the future.

Concepts: Population health, Government, Health care, Health economics, Medicine, Target Corporation, Health, Plan

0

This study utilized the Community Multi-scale Air Quality (CMAQ) model to simulate the spatial distribution of benzene, toluene, and xylene (BTX) concentrations in Ulsan metropolitan region (UMR), where large national industrial complexes (IC) are located. Through controlling the pollutant emissions in major IC, this study has performed a quantitative analysis on the influence of pollutant emissions from the IC on the BTX concentrations in surrounding urban areas. The seasonal modeling results indicated that the average BTX concentrations were high around the petrochemical complexes, with higher concentrations in the surrounding urban areas during the summer. The results of the emission control modeling in major IC showed that approximately 40% of the annual average BTX concentrations of nearby urban grids were directly influenced by pollutant emissions from the IC. While all three of the BTX pollutants showed similar seasonal differences, their contributions were highest during July. Daily contributions differed significantly throughout the modeling period, with some values reaching a maximum of 80% during July; overall, when the urban areas were located downwind of the IC, the contributions rose. Moreover, this study compared the differences in BTX contributions at each measurement point within the IC and urban areas, which indicated that the influence of the IC emissions decreased significantly with distance. The spatial distribution and the direct influence of the IC on the BTX concentrations in the UMR identified through this study could be used for basic data in environmental epidemiological studies.

Concepts: Ethylbenzene, Urban area, City, Metropolitan area, Soil contamination, Xylene, Toluene, Benzene

0

The role of infectious agents in the etiology of inflammatory diseases once believed to be non-infectious is increasingly being recognized. Many bacterial components in the indoor dust can evoke inflammatory lung diseases. Bacteria secrete nanometer-sized vesicles into the extracellular milieu, so-called extracellular vesicles (EVs). which are pathophysiologically related to inflammatory diseases. Microbiota compositions in the indoor dust revealed the presence of both gram-negative and gram-positive bacteria. Escherichia coli is a model organism of gram-negative Enterobacteriaceae. The repeated inhalation of E. coli-derived EVs caused neutrophilic inflammation and emphysema in a dose-dependent manner. The emphysema induced by E. coli-derived EVs was partially eliminated by the absence of IFN-gamma or IL-17, suggesting that Th1 and/or Th17 cell responses are important in the emphysema development. Meanwhile, the repeated inhalation of Staphylococcus aureus-derived EVs did not induce emphysema, although they induced neutrophilic inflammation in the lung. In terms of microbial EV compositions in the indoor dust, genera Pseudomonas, Acinetobacter, Enterobacter, and Staphylococcus were dominant. As for the clinical significance of sensitization to EVs in the indoor dust, EV sensitization was closely associated with asthma, COPD, and lung cancer. These data indicate that biological ultrafine particles in the indoor dust, which are mainly composed of microbial EVs, are important in the pathogenesis of chronic lung diseases associated with neutrophilic inflammation. Taken together, microbial EVs in the indoor dust are an important diagnostic and therapeutic target for the control of chronic lung diseases, such as asthma, COPD, and lung cancer.

Concepts: Microbiology, Chronic obstructive pulmonary disease, Infection, Pneumonia, Immune system, Escherichia coli, Asthma, Bacteria

0

In this economic evaluation of environmental epidemiological monitoring projects, we analyzed the economic feasibility of these projects by determining the social cost and benefit of these projects and conducting a cost/benefit analysis. Here, the social cost was evaluated by converting annual budgets for these research and survey projects into present values. Meanwhile, the societal benefit of these projects was evaluated by using the contingent valuation method to estimate the willingness to pay of residents living in or near industrial complexes. In addition, the extent to which these projects reduced negative health effects (i.e., excess disease and premature death) was evaluated through expert surveys, and the analysis was conducted to reflect the unit of economic value, based on the cost of illness and benefit transfer method. The results were then used to calculate the benefit of these projects in terms of the decrease in negative health effects. For residents living near industrial complexes, the benefit/cost ratio was 1.44 in the analysis based on resident surveys and 5.17 in the analysis based on expert surveys. Thus, whichever method was used for the economic analysis, the economic feasibility of these projects was confirmed.

Concepts: Contingent valuation, Value, Cost-benefit analysis, Costs, Sociology