Consulta: subjectFacets:"Pollutant"
Registros recuperados: 6
Data/hora: 08/06/2024 07:51:42

Impact of pollutants on aneuploidy in the Pacific oyster, Crassostrea gigas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bouilly, Karine; Leitao, Alexandra; Mccombie, Helen; Miramand, Pierre; Lapegue, Sylvie.
Aneuploidy is the alteration of the normal diploid chromosome number. In the Pacifie oyster, Crassastrea gigas, hypodiploid cells have regularly been reported as have a negative correlation between this phenomenon and growth and evidence for a genetic basis. We previously demonstrated a positive relationship between a pollutant, atrazine, and aneuploidy in Crassastrea gigas adults and juveniles. To evaluate the persistence of this impact, the present study focused on a sample of the same juveniles previously exposed to different atrazine treatments (0.0 1 mg/l which represents a peak value found in a polluted environment and 0.1 mg/l) for three and a half months. Then, we evaluated them for aneuploidy after another two and a half months in non polluted...
Tipo: Text
Palavras-chave: Cadmium; Atrazine; Pollutant; Pacific oyster; Aneuploidy.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-2852.pdf

TRANSMER, hydrodynamic model for medium- and long-term simulation of radionuclides transfers in the English Channel and southern North Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bailly Du Bois, Pascal; Dumas, Franck.
TRANSMER hydrodynamic model simulates dispersion of dissolved substances in seawater at the scale of the English Channel and the south of the North Sea with a mesh size of one kilometre and a time step of 30 minutes. This model evaluates the medium- and long-term consequences of releases of soluble pollutants in the marine ecosystem under normal or accidental conditions, at a very low computation cost (it takes less than one hour to simulate one year). It has been qualitatively and quantitatively validated by 1400 measurements of 125Sb in seawater in the English Channel and the North Sea. Budgets of measured and simulated radionuclide quantities are balanced for theses seas. The correlation factor between individual measurements in seawater and calculation...
Tipo: Text
Palavras-chave: Pollutant; Ecosystem; Radionuclides; Dispersion; Dissolved substances; Hydrodynamic model.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/2005/publication-552.pdf

Effect of in vivo pesticide exposure and injection of bacteria on immune gene expression in the Pacific oyster, Crassostrea gigas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gagnaire, Beatrice; Renault, Tristan; Thomas Guyon, Hélène; Burgeot, Thierry.
Bay of Marennes-Oleron is an important French area of reproduction for sea bass, Dicentrarchus labrax. This area is often subjected to many pollutions due to anthropic activities, including pesticides and polycyclic aromatic hydrocarbons (PAH) which cause adverse effects in aquatic organisms. The harmful effects of such   contaminants on fish immune system leading to a decreased resistance against pathogens begin to be described, but remain poorly  known. In this context, influence of micropolluants, like PAH, on the defense mechanisms developed by sea bass was tested. Fish were exposed five days to a soluble fraction of PAH with environmental concentration (760 ng/L). At the end of the contamination, fish were transferred to non contaminated sea water and...
Tipo: Text
Palavras-chave: Phagocytosis; Vibrio; Pesticides; Pollutant; Crasssotrea gigas; Oysters.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-3317.pdf

Potential of macrophyte for removing arsenic from aqueous solution
Provedor de dados: Planta Daninha
Autores: Guimaraes,F.P.; Aguiar,R.; Oliveira,J.A.; Silva,J.A.A.; Karam,D.
The potential of three aquatic macrophytes, Azoll caroliniana, Salvinia minima and Lemna gibba, was evaluated in this work aimed at selection of plants to be used in remediation of environments contaminated by arsenic (As). The experiments were carried out in a greenhouse during six days in pots containing Hoagland solution (¼ ionic strength) at As concentrations of 0.5; 2.5 and 5.0 mg L-1. The three species showed greater As accumulation as the concentration of the metalloid in solution increased. However, a reduction was detected in fresh and dry mass gain when the plants were exposed to high As concentrations. The macrophytes showed differences in efficiency of removal of As in solution. A. caroliniana, S. minima and L. gibba accumulated, on average,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bio-remediation; Phyto-remediation; Aquatic plants; Pollutant.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000400001

Evaluation of microbial contamination of feces and soil on a laying-hen farm depending on sampling site and season
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Trawińska,Beata; Chmielowiec-Korzeniowska,Anna; Nowakowicz-Dębek,Bożena; Tymczyna,Leszek; Bombik,Teresa; Pyrz,Magdalena; Tymczyna-Sobotka,Monika.
ABSTRACT The objective of the present study was to evaluate soil collected from a laying-hen farm and bird manure according to the season of the year and sampling site. Soil samples were taken at the poultry facility wall and at the distances of 15 m and 45 m from the building. Bird feces samples were collected inside the poultry house at the entrance and at 1/4 and 1/2 length of the building. Soil and bird feces samples were evaluated by bacteriological qualitative and quantitative analyses. The largest bacterial load was determined in the samples taken at the poultry facility wall in December/January. Soil microbial contamination degree was low. The highest bacterial count in bird manure was found in the samples collected at 1/2 length of the hen house...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Manure; Microbiology; Pollutant; Poultry; Soil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000400190

Nonylphenol: Properties, legislation, toxicity and determination
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: ARAUJO,FREDERICO G. DE; BAUERFELDT,GLAUCO F.; CID,YARA PELUSO.
ABSTRACT This paper aims to gather and discuss important information about nonylphenol, such as physical chemistry properties, toxicity and analytical methods in various matrices. As a degradation product of ethoxylated alkylphenols, nonylphenol presents a higher degree of reactivity than its precursor. Due to its harmful effects on the environment, use and production of nonylphenol has been banned in European Union countries, alongside their precursors. The guide on quality of drinking water (USEPA) recommends a maximum concentration of 28 µg L-1 for fresh water. In Brazil, there is no clear legislation containing values ​​of maximum concentration of nonylphenol. Due to this lack of regulation, a continuous monitoring is necessary of this pollutant in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonylphenol; Endocrine disrupter; Pollutant; Water analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501903