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51.
Vanessa Ecla de Oliveira Ana Paula Vanin Ani Carla Concato Wagner A. Tamagno Helen Treichel Rosilene R. Kaizer 《环境质量管理》2019,29(1):147-154
This study examined behavioral and enzymatic changes of C. elegans from its exposure to aluminum, and the resulting relationship with Alzheimer's disease. After chronic and acute exposure to aluminum, the results indicated that it alters the cholinergic status and behavior parameters of the nematode, suggesting a relationship between exposure to aluminum and the etiology of AD. 相似文献
52.
Regan Lyon Christopher Lyon Helen Markowski Sara L. Boltinhouse 《Traffic injury prevention》2016,17(2):109-113
Objective: Outcomes from previous studies report the driving under the influence (DUI) conviction rates for trauma patients in several cities within Canada and the United States over the last 2 decades. This study reports charge, conviction, and prosecution rates for trauma patients at 2 level I trauma centers servicing a large metropolitan city.
Methods: A retrospective review of the trauma databases was completed to identify patients meeting inclusion criteria. Four hundred sixty patients were identified and their records were compared with the district attorney's records for DUI charges and convictions.
Results: The conviction rate for this study was 8.7%, demonstrating continued low rates of conviction despite growing interest and public awareness of drinking and driving.
Conclusions: We discuss legal considerations that providers should consider when treating patients who have been drinking and driving. 相似文献
53.
Noni Holmes Helen Lingard Zeynep Yesilyurt Fred De Munk 《Journal of Safety Research》1999,30(4):1104-261
A qualitative study of employers' and employees' meanings of occupational health and safety (OHS) risk control was conducted among a sample of small businesses engaged in the Australian construction industry. Two OHS risks relevant to the construction industry were selected for study. One risk (falls from height) represented an immediate consequence, whereas the other (occupational skin disease) represented a long-term health effect. Meanings of the sources and control for these risks were explored during in-depth interviews. Participants perceived the immediate effect, falls from height OHS risk, as being more important in their workplaces than the delayed effect, skin disease OHS risk. The risk of falls from height was perceived to be controllable but requiring a great deal of effort to prevent, whereas there was a fatalistic resignation to the risk of occupational skin disease. Meanings of risk control for both occupational skin disease and falls from height focused on individual rather than technological risk controls. Organizational barriers to the adoption of technological OHS risk controls in the construction industry were identified. 相似文献
54.
Helen Kopnina 《国际发展与全球生态学杂志》2016,23(2):113-121
Environmental unsustainability is due to both structural features and historically specific characteristics of industrial capitalism resulting in specific patterns of production and consumption, as well as population growth. Sustainability literature criticises the established corporate and political power hegemonies, interested in maintaining economic growth, as well as inability or unwillingness of citizen-consumers to counteract these hegemonic tendencies. Yet, official policies are still targeted at social and economic ‘development’ as a panacea for unsustainability challenges. Instead, renewed accent on social and economic objectives are outlined by a set of sustainable development goals (SDG) that include objectives of fighting poverty, promoting better health, reducing mortality, and stimulating equitable economic growth. What is less commonly critiqued is the underlying morality of unsustainability and ethical questions concerned with the ‘victims of unsustainability’ outside of socioeconomic discourse. The achievement of SDG goals, as will be further elaborated on in this article, is unlikely to lead to greater social equality and economic prosperity, but to a greater spread of unsustainable production and consumption, continuous economic as well as population growth that has caused environmental problems in the first place and further objectification of environment and its elements. This article argues that an invocation of ethical duty toward environment and its elements is required in order to move beyond the current status quo. Such ethical approach to unsustainability can effectively address the shortcomings of the mainstream sustainability discourse that is mainly anthropocentric and therefore fails to identify the correct locus of unsustainability. 相似文献
55.
Three populations of the grazing isopod Idotea balthica were exposed to high CO2 treatment for a period of 20 days to investigate the effect of ocean acidification (OA) on animal health and immunocompetence. The results of the populations from more saline habitats were comparable and showed a 60–80 % decrease in immune response as a result of the high CO2 treatment. Analysis of protein carbonyls showed no treatment effect, indicating that short-term OA does not increase oxidative protein damage. Meanwhile, the third tested population from the lower saline Baltic Sea had higher background protein carbonyl levels. Ocean acidification in addition to this resulted in 100 % mortality. The results of this study show that OA reduced immunocompetence of this marine isopod. In addition, populations and individuals in poor health are potentially at greater risk to succumb under OA. 相似文献
56.
Helen S. Findlay Michael A. Kendall John I. Spicer Stephen Widdicombe 《Marine Biology》2010,157(4):725-735
Ocean acidification and global warming are occurring concomitantly, yet few studies have investigated how organisms will respond
to increases in both temperature and CO2. Intertidal microcosms were used to examine growth, shell mineralogy and survival of two intertidal barnacle post-larvae,
Semibalanus balanoides and Elminius modestus, at two temperatures (14 and 19°C) and two CO2 concentrations (380 and 1,000 ppm), fed with a mixed diatom-flagellate diet at 15,000 cells ml−1 with flow rate of 10 ml−1 min−1. Control growth rates, using operculum diameter, were 14 ± 8 μm day−1 and 6 ± 2 μm day−1 for S. balanoides and E. modestus, respectively. Subtle, but significant decreases in E. modestus growth rate were observed in high CO2 but there were no impacts on shell calcium content and survival by either elevated temperature or CO2. S. balanoides exhibited no clear alterations in growth rate but did show a large reduction in shell calcium content and survival under
elevated temperature and CO2. These results suggest that a decrease by 0.4 pH(NBS) units alone would not be sufficient to directly impact the survival of barnacles during the first month post-settlement.
However, in conjunction with a 4–5°C increase in temperature, it appears that significant changes to the biology of these
organisms will ensue. 相似文献
57.
Helen Jarvis 《Local Environment》2013,18(3):239-256
Planners and policy makers in the UK and the USA widely believe that negative attendants of growth, such as congestion, pollution and sprawl, can be stemmed by mixed-use 'urban village' design solutions. It is assumed that concentrating jobs, housing, shops and schools within compact communities reduces individual recourse to energy-consuming movement. This paper critically examines this assumption. It draws on detailed observation of dual-earner household decisions concerning where and how to live, focusing on the two west-coast US cities of Portland and Seattle. The question is asked whether co-ordination of home and work is more manageable for working parents living in a compact city such as Portland. Contrary to popular belief, urban living is not synonymous with more localised modes of living. Residential preference does not hinge on job location or household structure alone. Equally, job location, child care and shopping practices do not hinge on residential location. For dual-earner households, tensions exist not only between individuals balancing the demands of competing careers but also between mutually exclusive tastes and identitities. Preferences associated with children's education, attachment to place, local social networks and moral cultures effectively cross-cut those of housing choice, journey to work and personal environmental ethos. The resulting 'compromises' profoundly shape the profile and quality of the built environment and its associated ecological footprint. Understanding this requires further development of a household approach to urban social and environmental sustainability. Planificadores y creadores de normas en Gran Bretaña y en Los Estados Unidos creen ampliamente que las asociaciones negativas de crecimiento, tales como congestión, polución y el crecimiento urbano descontrolado, pueden ser detenidas mediante el uso combinado de soluciones de diseño de villas urbanas. Se asume que concentrar empleos, vivienda, almacenes y escuelas dentro de comunidades compactas reduce el recurso individual del consumo de energía por movimiento. Este documento examina críticamente este supuesto. Describe con detallada observación las decisiones de hogares con doble ingreso concerniendo donde y como vivir, centrandose en las dos ciudades de la Costa Oeste de Los Estados Unidos, Portland y Seattle. La pregunta es si la coordinación de hogar y trabajo es mas manejable para padres trabajadores que viven en ciudades compactas como Portland. Contrario a la creencia popular, vida urbana no es sinónimo de mas localizados estilos de vida. La preferencia residencial no depende de la ubicación del trabajo o la sola estructura del hogar. Igualmente, la ubicación del trabajo, guarderias para niños y practicas de compra no dependen del lugar de residencia. Para hogares con doble ingreso, las tensiones no solo existen entre los individuos equilibrando las demandas de carreras competentes sino tambien entre exclusivos gustos e identidades mutuas. Las Preferencias asociadas con la educacion de los niños, el apego al lugar, las redes sociales locales y las culturas morales cortan eficazmente esas de selección de vivienda, trayecto al trabajo y carácter ambiental personal. Los 'acuerdos' resultantes moldean profundamente el perfil y la calidad del ambiente construido y su huella ecológica asociada. Para entender esto se requiere un desarrollo adicional del enfoque del hogar hacia el sostenimiento ambiental y social urbano. 相似文献
58.
Rood AS Voillequé PG Rope SK Grogan HA Till JE 《Journal of environmental radioactivity》2008,99(8):1258-1278
Radionuclide concentrations in air from uranium milling emissions were estimated for the town of Uravan, Colorado, USA and the surrounding area for a 49-yr period of mill operations beginning in 1936 and ending in 1984. Milling processes with the potential to emit radionuclides to the air included crushing and grinding of ores; conveyance of ore; ore roasting, drying, and packaging of the product (U(3)O(8)); and fugitive dust releases from ore piles, tailings' piles, and roads. The town of Uravan is located in a narrow canyon formed by the San Miguel River in western Colorado. Atmospheric transport modeling required a complex terrain model. Because historical meteorological data necessary for a complex terrain model were lacking, meteorological instruments were installed, and relevant data were collected for 1 yr. Monthly average dispersion and deposition factors were calculated using the complex terrain model, CALPUFF. Radionuclide concentrations in air and deposition on ground were calculated by multiplying the estimated source-specific release rate by the dispersion or deposition factor. Time-dependent resuspension was also included in the model. Predicted concentrations in air and soil were compared to measurements from continuous air samplers from 1979 to 1986 and to soil profile sampling performed in 2006. The geometric mean predicted-to-observed ratio for annual average air concentrations was 1.25 with a geometric standard deviation of 1.8. Predicted-to-observed ratios for uranium concentrations in undisturbed soil ranged from 0.67 to 1.22. Average air concentrations from 1936 to 1984 in housing blocks ranged from about 2.5 to 6 mBq m(-3) for (238)U and 1.5 to 3.5 mBq m(-3) for (230)Th, (226)Ra, and (210)Pb. 相似文献
59.
Phosphorus (P) inputs to sewage treatment works (STW) come from a variety of sources and filtration of treated wastewater prior to discharge into receiving waters is a common practice. This means P in treated wastewaters may be present in forms that are potentially more bioavailable and mobile. We conducted a 2-year study to determine P species up and downstream of two STW outfalls into two tributaries of the River Thames. Downstream of the outfalls, P concentrations in both rivers were frequently greater by an order of magnitude for all species of P. A high proportion of total P (TP) in the downstream waters was determined as dissolved, which was largely comprised of soluble reactive P (SRP) - considered as the most bioavailable P species. Furthermore no significant difference in SRP was found in receiving waters passed through 0.45 and 0.10 μm filters. This means that P from STWs occurs in <0.1 μm fraction size, which will not readily settle to the channel bed and is more easily assimilated by biota. This distinguishes STW inputs from agricultural runoff where a high proportion of P occurs as particulate P which is both less bioavailable and more likely to settle to the channel bed. This implies that STWs derived P is likely to have a greater adverse impact on the receiving river than agricultural runoff. 相似文献
60.
Sadauskas-Henrique H Sakuragui MM Paulino MG Fernandes MN 《Environmental monitoring and assessment》2011,181(1-4):29-42
The condition factor and blood variables, including erythrocyte lipid peroxidation (LPO) and the activity of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx), in two ecologically distinct fish species (Astyanax fasciatus and Pimelodus maculatus) were evaluated at five sites in the Furnas Hydroelectric Power Station reservoir (Brazil) to assess water quality. Aldrin/dieldrin, endosulfan, heptachlor epoxide, and metolachlor were detected at different concentrations in four of the sites. Condition factor was not directly affected by such contaminants. A negative correlation between hematocrit and heptachlor was detected in P. maculatus. Positive correlations between red blood cells and heptachlor as well as an interactive effect of metolachlor and aldrin/dieldrin were detected in A. fasciatus. The erythrocytes of both species collected from the contaminated sites showed high levels of LPO, an increase in SOD and GPx activities and a decrease in CAT activity. Although the leukocyte number and the differential percentage of leukocytes varied among the sites, the hematological variables, the LPO levels, and the antioxidant enzyme activities could be used to assess water quality, regardless of the differences in the responses of the fish species. 相似文献