Navegando por Autor "OIKAWA, Teiichi"

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Acesso aberto (Open Access)
Anemia, parasitismo intestinal e exposição mercurial em duas comunidades ribeirinhas da Amazônia
(Universidade Federal do Pará, 2003) OIKAWA, Teiichi; VIEIRA, José Luiz Fernandes; http://lattes.cnpq.br/2739079559531098
The incidence of anemia, intestinal parasitism and mercurial exposure prevalence in two Amazon riverside communities, São Luiz of Tapajós (Tapajós River) and Igarapé-Mirim (Tocantins River), where social-economics standards are similar. Eighty hair simples, blood and stool were analyzed. The results demonstrated incidence of intestinal parasitism of 42.5% in São Luiz of Tapajós and 75,15% in Igarapé-Mirim. The hematimetrics indexes indicated incidence of anemia of 40% in São Luiz do Tapajós and 25% in Igarapé-Mirim. The medium total mercury concentrations in hair samples of the residents in São Luiz of Tapajós were 14.9 ± 6.6 µg/g in male individuals and 13,4 ± 3,4 µg/g in the females sex, while in Igarapé-Mirim they were of 2,5 ± 1,4 µg/g in the male probant and 3,5 ± 1,6 µg/g in the female one. It was observed in São Luiz do Tapajós, 82,5% of concentrations of total mercury are above the 10 µg/g, value of reference for population no exposed, while in Igarapé-Mirim, any values above these were fround values. It can be concluded that the quality of life of the riverine people analyzed is committed by the appraised factors, becoming necessary the adoption of preventive ways of educative actions in those communities by government authorities sponsor.
Acesso aberto (Open Access)
Avaliação da contaminação mercurial mediante análise do teor de Hg total em amostras de cabelo em comunidades ribeirinhas do Tapajós, Pará, Brasil
(2000-04) PINHEIRO, Maria da Conceição Nascimento; GUIMARÃES, Geraldo de Assis; NAKANISHI, Junko; OIKAWA, Teiichi; VIEIRA, José Luiz Fernandes; QUARESMA, Manoel; CARDOSO, Bernardo da Silva; AMORAS, Walter Wanderley
This study evaluates human exposure to methylmercury in fishermen and their families in four villages on the Tapajós river: Rainha, Barreiras, São Luís do Tapajós and Paraná-Mirim. Hair analyses were performed with atomic absorption spectophotometry. Total hair mercury levels varied between 2.9mg/g and 71.5mg/g. Paraná-Mirim showed the lowest level. The highest level was found in São Luís do Tapajós and Barreiras. The hair mercury was six to seven times higher than the established safe limit of 10mg/g. No statistically significant difference was found between the mean level of total mercury taken from the inhabitants living downstream and upstream in Itaituba village (p > 0.05). These results confirm that human exposure to methylmercury is occurring on the Tapajós river and suggest that continued fish ingestion in that region is a potential risk factor for the appearance of symptoms and signs of Minamata disease. An immediate epidemiological survey program is recommended.
Acesso aberto (Open Access)
Comparative study of human exposure to mercury in riverside communities in the Amazon region
(2006-03) PINHEIRO, Maria da Conceição Nascimento; OIKAWA, Teiichi; VIEIRA, José Luiz Fernandes; GOMES, M S V; GUIMARÃES, Geraldo de Assis; CRESPO LÓPEZ, Maria Elena; MÜLLER, Regina Celi Sarkis; AMORAS, Walter Wanderley; RIBEIRO, Danielle Regina Gomes; RODRIGUES, Anderson Raiol; CÔRTES, Maria Izabel Tentes; SILVEIRA, Luiz Carlos de Lima
Four populations in the Amazon area were selected for a comparative study of mercury-exposed and non-exposed populations: São Luiz do Tapajós, Barreiras, Panacauera, and Pindobal Grande. The highest mercury levels in human hair samples were found in São Luiz do Tapajós and Barreiras, greatly exceeding the limits established by the World Health Organization. Panacauera showed an intermediate level below 9 µg/g. This was the first comparative and simultaneous evaluation of mercury exposure in the Amazon area. Also, thanks to this type of monitoring, we were able to eliminate the uncertainties about the reference dose. On the basis of these data, we can conclude that the mercury levels detected in exposed populations of the Tapajós River basin may be dangerous not only because they are above the World Health Organization limits, but also because the simultaneous mercury detection in non-exposed populations with similar characteristics provided a valid control and revealed lower mercury levels. Our results support the importance of continuous monitoring in both exposed and non-exposed populations.
Acesso aberto (Open Access)
Exposição humana ao metilmercúrio em comunidades ribeirinhas da Região do Tapajós, Pará, Brasil
(2000-06) PINHEIRO, Maria da Conceição Nascimento; NAKANISHI, Junko; OIKAWA, Teiichi; GUIMARÃES, Geraldo de Assis; QUARESMA, Manoel; CARDOSO, Bernardo da Silva; AMORAS, Walter Wanderley; HARADA, Masazume; MAGNO, Carlos; VIEIRA, José Luiz Fernandes; XAVIER, Marília Brasil; BACELAR, Maria Denise Ribeiro
Evaluation of total human exposure to mercury and methylmercury was effected in riverine villages along the Tapajos river and in the metropolitan area of Belem city, state of Para, Brazil, by using total mercury and methylmercury concentrations in hair samples in 1994 and 1995. It was observed that average concentrations of total mercury are in a range from 2 ± 1µg/g-1 to 20.5 ± 12.1µg/g-1. While methylmercury average concentration varies from 1.4 ± 0.7µg/g-1 to 18.5 ± 11µg/g-1. These results confirm mercury contamination in the Tapajos river and possible appearance of mercury intoxication symptoms, and recommends the monitoring of compounds in hair samples as well as the need for epidemiological and clinical studies for human health prevention and control of mercury intoxication.
Acesso aberto (Open Access)
Hormônios tireoidianos, anti-TPO e concentrações de mercúrio total na avaliação da disfunção glandular em população ribeirinha da Amazônia
(Universidade Federal do Pará, 2015) OIKAWA, Teiichi; PINHEIRO, Maria da Conceição Nascimento; http://lattes.cnpq.br/6353829454533268
There is evidence that mercury accumulation in the thyroid can cause endocrine and immune disorders. Riverside populations of the Amazon with a history of prolonged exposure to mercury have been investigated for neurological damage, but little is known about the hormonal disorders and specific immune thyroid. The objective of this study is to verify the existence of association between the total mercury concentrations in hair samples and concentrations of thyroid hormones and the anti-TPO antibody. The study included 86 riverine from Tapajos region mercury exposed to long-term. Participated this study men and women aged between 14 and 54 years, residents in place for more than five years. Measurements of serum hormone concentrations (TSH, T3 and free T4) and Anti-TPO titles were taken by enzyme immunoassay. Total mercury (THg) in hair samples was measured by atomic absorption spectrophotometry by cold vapor technique. Hormonal dysfunction occurred in 10.3% with an increase of T3, 2.3% with a reduction of T4L, 3.4% decrease in TSH and 4.6% with increased TSH expressed that the maximum value of 8.9 μU/m. Anti-TPO titles were normal in all participants. There was no correlation of hormonal markers (TSH, T3 and T4L) or the Anti-TPO with mercury levels. The results showed that THg concentrations in hair, serum TSH and anti-TPO titles were not influenced by sex; that hormonal changes in thyroid studied riparian not associated with the levels of THg suggesting the interference of protector factors on thyroid function.