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High levels of Mercury and Lead detected by hair analysis in two Venezuelan environments Acta Amazonica
Marcano,Eunice; Labady,Mary; Gomes,Clara; Aguiar,Guillermina; Laine,Jorge.
Mercury and Lead concentrations obtained by ICP-OAS analysis of human hair from riverside communities along the Orinoco river in the Amazon state (Venezuela) were compared with those from Caracas, Venezuela. Taking into account the characteristics of these two environments and the values of the average concentrations of Mercury and Lead, baselines were established suggesting that gold mining activity near the Orinoco river is responsible for the high levels of Mercury in hair from the Amazon state, whereas automobile activity is responsible for high levels of Lead in hair in Caracas.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Human hair; Hair analysis; Lead pollution; Mercury pollution; Environmental exposure.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000200010
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Dioxins and polychlorinated biphenyls concentrations in Larus dominicanus. Case study: Marambaia island, Sepetiba bay, Rio de Janeiro State, Brazil - doi: 10.4025/actascibiolsci.v35i3.18344 Biological Sciences
Ferreira, Aldo Pacheco; Fundação Oswaldo Cruz; Wermelinger, Eduardo Dias; Fundação Oswaldo Cruz.
Seabirds play a significant role as bioindicators: they are conspicuous, relatively easy to observe, well-established studied group of organisms, and in the focus of public interest due to pollution in aquatic ecosystem. Systematically, a significant number of man-made chemicals have been introduced in the marine environment and represent the major problem arising in the development worldwide. Many of these chemical contaminants are persistent, known to bioaccumulate and biomagnify through the aquatic food web, affecting species associated with aquatic systems. Dioxins [polychlorinated dibenzo-p-dioxins (PCDD), dibenzofurans (PCDF)] and polychlorinated biphenyls (PCB) concentrations were measured in Kelp gull Larus dominicanus collected from 2006 to 2011...
Tipo: Análises químicas (or`gânicas) Palavras-chave: 2.05.02.00-1 marine pollution; Environmental exposure; Dioxins; Polychlorinated biphenyls ecologia de ecossistemas.
Ano: 2013 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18344
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ECONOMIC AND ENVIRONMENTAL EFFECTS ASSOCIATED WITH REDUCING THE USE OF ATRAZINE: AN EXAMPLE OF CROSS-DISCIPLINARY RESEARCH AgEcon
Ribaudo, Marc; Hurley, Terrance M..
Restricting or eliminating the use of atrazine in the Midwest would have important economic consequences for farmers, consumers, and the environment. These consequences can only be evaluated with cooperation between economists and weed scientists. The weed control choice set available to farmers cannot be observed through deductive research. Economists and weed scientists worked together to identify all possible weed control strategies for corn and sorghum in the Midwest and to incorporate them into an economic model. An atrazine ban was found to be the costliest strategy, and a targeted, water-quality based strategy the most cost effective.
Tipo: Journal Article Palavras-chave: Atrazine; Deductive research; Environmental exposure; Herbicides; Inductive research; Welfare; Crop Production/Industries.
Ano: 1997 URL: http://purl.umn.edu/15542
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Turkey Wattle Temperature Response to Distinct Environmental Factors Rev. Bras. Ciênc. Avic.
Mendes,AS; Moura,DJ; Morello,GM; Carvalho,TMR; Sikorski,RR.
ABSTRACT Rearing environmental conditions are important for turkey production, because this bird is particularly sensitive to heat stress. This study aimed at measuring the wattle temperature response of turkeys of three different ages (61, 96, and 131 days old) exposed to different combinations of dry bulb temperature, relative humidity, and wind speed ranges, as an indication of their physiological responses. The experiment was conducted with 42 male birds housed in a controlled environment chamber and exposed to different combinations of two air speed (WS) ranges (WS1 = 0.3-0.6 ms-1, considered low, and WS2 = 1.2-1.6 ms-1, considered high), dry bulb temperature (DBT) between 22 and 34 °C, and relative humidity (RH) between 40 to 90 %. The statistical...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Wind speed; Thermal comfort; Relative humidity; Environmental exposure.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400439
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