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| Registros recuperados: 154 | |
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| Forget, Joelle; Beliaeff, Benoit; Bocquene, Gilles. |
| From April 1997 to June 1998, 14 measurements of acetylcholinesterase (AChE) enzymatic activity were performed with the copepod, Tigriopus brevicornis, collected at five stations in the Vilaine River estuary (South Brittany, France). Simultaneously, four chemical analyses of triazines and one analysis of total pesticides in water were undertaken. AChE activity levels in T brevicornis were compared to the levels measured at a reference site not exposed to effluents from Vilaine River. Results reveal significant differences between AChE activity levels depending on location of stations in the plume of the river with an increasing gradient of activity from the upstream to the downstream stations, thus indicating that neurotoxic contaminants are mainly brought... |
| Tipo: Text |
Palavras-chave: Monitoring; Estuary; Pollution; Pesticides; Tigriopus brevicornis; Acetylcholinesterase activity. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-737.pdf |
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| PEREIRA,P.C.; BRUNETTI,I.A.; CASTRO,K.S.; CHIAROTTI,L.F.; SANTOS,B.E.; MORAES,J.C.; CRUZ,C.. |
| ABSTRACT: This study aimed to establish the mass cultivation of Wolffia brasiliensis under laboratory conditions, determine the sensitivity of reference substances (potassium dichromate, sodium chloride, and potassium chloride), and estimate the acute toxicity (LC50;7d) for the herbicide glyphosate, diquat, paraquat, imazapyr, 2,4-D, saflufenacil, imazamox, penoxsulam, metsulfuron-methyl, and atrazine. Three media were tested for culture establishment: Hoagland’s medium, 5.0 g L-1 NPK fertilizer (20-5-20), a mixture of Oxisol + organic substrate of decaying aquatic plant (2:1; v v-1). Sensitivity tests with reference substances and acute toxicity for herbicides were carried out after establishing the cultivation. The species W. brasiliensis presented an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macrophytes; Chemicals; Ecotoxicology; Reference substances; Pesticides. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100289 |
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| Mello, Giovanni Lemos de; EPAGRI; Amaral Júnior, Hilton; Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri; Garcia, Silvano; Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri; Vinatea, Luis; UFSC. |
| The objective of this study was to determine the LC50 (96h) of two pesticides: Sirius® 250 SC herbicide of the pyrazosulfuron-ethyl group, and Talcord® insecticide of the permethrin group, on juvenile Litopenaeus vannamei. Shrimp total hemocyte count (THC) was also determined as an indication of physiological alterations caused by the pesticides. Juvenile shrimp (5.0 ± 0.5 g) were exposed to the following concentrations: 0, 0.1, 1.0, 10, 100 and 1000 µg L-1 Sirius® 250 SC; and 0, 0.001, 0.01, 0.1, 1.0 and 10 µg L-1 Talcord®. The Talcord® LC50 (96h) was of 0.00933 µg L-1 or 9.33 ng L-1. There were no significant changes in the THC between control and test groups. No... |
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Palavras-chave: Toxicology; Pesticides; Shrimp culture; Litopenaeus vannamei Toxicology; Pesticides; Shrimp culture; Litopenaeus vannamei. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/6974 |
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| Kreutz,Luiz Carlos; Barcellos,Leonardo José Gil; Silva,Tális Oliveira; Anziliero,Deniz; Martins,Daiana; Lorenson,Monique; Marteninghe,Ariane; Silva,Leonardo Bolognese da. |
| Toxicity risks of agricultural pesticides to fishes are pivotal. Currently, many questions remain unsolved regarding to the toxicity of commonly used pesticides to silver catfish (Rhamdia quelen), a South American catfish. The present studies have been designed to investigate the acute toxicity and the lethal concentration (LC50) of four herbicides, two fungicides and two insecticides to silver catfish fingerlings. All experiments were carried out in triplicates, in a static bioassay system, using commercially available pesticides. The data was analyzed through the Trimmed Spearman-Karber method available from the Environmental Protection Agency. The 96hLC50 and 95% lower and upper confidence limits, respectively, for the following pesticides were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioassay; Toxicity; Pesticides; LC50; Rhamdia quelen. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000400022 |
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| Moreau, Kevin. |
| Des mortalités chez l'huître creuse, Crassostrea gigas, ont été associées au virus OsHV-1 (Oyster herpes virus 1) au stade larvaire et chez des juvéniles. Cependant, aucune mortalité liée à ce virus n'a été rapportée chez les animaux adultes. Cette observation laisse suspecter l'existence de mécanismes dirigés contre ce virus chez cette espèce. Il a peu de connaissances à l'heure actuelle sur les mécanismes de défense antivirale chez les bivalves, en particulier chez l'huître creuse, C. gigas, comme étant sur-exprimés en présence du virus. Ces gènes, s'ils ne peuvent être considérés comme des gènes de défense à proprement parlé, participent à la réponse de l'huître vis à vis du virus. Par ailleurs, des polluants comme les pesticides sont susceptibles de... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; OsHV-1; Pesticides; Expression génétique; RT-PCR semi-quantative. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00032/14339/11622.pdf |
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| GOMES, M. A. F.; FILIZOLA, H. F.; PAULA, M. M. de; DIOGO, A.; CERDEIRA, A. L.. |
| O presente trabalho tem por objetivo apresentar os dados de reconhecimento e de seleção de áreas de recarga visualmente mais críticas do Aquífero Guarani, localizadas no município de Mineiros, GO, dentro da porção noroeste da Bacia Sedimentar do Paraná. Os locais selecionados serão objeto de estudo do projeto denominado "Uso agrícola das áreas de recarga do Aquífero Gurani e implicações na qualidade da água subterrânea", principalmente no que se refere à caracterização de áreas que oferecem maior risco de ocntaminação (potencial e efetivo) para a água subterrânea, à partir das atividades agrícolas, como também do projeto intitulado "Recuperação ambiental das nascentes do Rio Araguaia. |
| Tipo: Folhetos |
Palavras-chave: Aquífero; Área de recarga; Agricultura; Impacto ambiental; Agrotóxico; Desmatamento; Erosão do solo; Agriculture; Environmental impact; Pesticides; Deforestation; Soil erosion. |
| Ano: 2000 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/963895 |
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| Salvagni,Jaqueli; Ternus,Raquel Zeni; Fuentefria,Alexandre Meneghello. |
| The aim of this study was to assess the use of pesticides on farms located in the Lambedor River watershed in Guatambu, State of Santa Catarina, as well as to determine, by micronucleus testing, the risk of genotoxic impact. Samples from locally collected Cyprinus carpio, Hypostomus punctatus, Rhamdia quelen and Oreochromis niloticus gave evidence of a mean increase in micronuclei frequency from 6.21 to 13.78 in 1,000 erythrocytes, a clear indication of the genotoxic potenciality of pesticide residues in regional dams, and their significant contribution to local environmental contamination. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Environment; Micronucleus test. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100021 |
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| CHAIM, A.; VALARINI, P. J.; OLIVEIRA, D. de A.; MORSOLETO, R. V.; PIO, L. C.. |
| O objetivo deste trabalho foi avaliar a quantidade de agrotóxico perdida durante a pulverização da cultura de feijão e de tomate. Na de feijão, os testes foram realizados quando as plantas se apresentavam com 15, 35 e 60 cm de altura, enquanto, para o tomate, com 40 e 70 cm de altura. Em todos os testes, a deposição no topo das plantas foi maior do que a da região mediana e basal. As perdas para a cultura do feijão ficaram entre 49 e 88% do total do traçador aplicado e, as do tomate, entre 44 e 70%. |
| Tipo: Folhetos |
Palavras-chave: Perdas; Deposição; Pulverização; Agrotóxico; Feijão; Tomate; Método de Aplicação; Spraying; Pesticides. |
| Ano: 1999 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/13120 |
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| Diez,M.C. |
| Worldwide use of pesticide has increased dramatically during the last two decades. As a consequence, pesticide residues and their transformation products are frequently found in groundwater and surface waters. This review summarizes information about polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), some chlorophenols; it mainly empathizes on pesticides, their incorporation into the environment, microorganisms involved in their degradation and, some physico-chemical aspects of pesticides behavior in soils. Details about residues of pesticides in groundwater and superficial water found in some foreign countries and in Chile are reported, as well. The fungal degradation of organic pollutants (xenobiotics) is considered as an... |
| Tipo: Journal article |
Palavras-chave: Biodegradation; White-rot fungi; Pesticides; Biobeds. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100004 |
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| Carvalho,Fernando K.; Antuniassi,Ulisses R.; Chechetto,Rodolfo G.; Mota,Alisson A. B.; Kruger,Greg R.. |
| ABSTRACT The effect of blade angle on droplet size spectrum of five rotary cage atomizers and one rotary disc atomizer used in Brazil was evaluated in a high speed wind tunnel, with an air speed of 180 km h−1. This study included the characterization of the droplet size spectrum, via laser diffraction instrument, generated by three blades angles, of 45, 60 and 75 degrees. The spray solution was composed of Picoxystrobin+ Cyproconazole fungicide (SC), at 20 mL c.p. L−1, and at a flow rate of 6 L min−1. As the angle decreased from 75 to 45 degrees, the rotational speed of the atomizers increased and the volume median diameter (VMD) decreased. However, increasing the rotational speed also increased the percentage of droplets smaller than 100 µm (% < 100... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Application technology; Atomization; Spray drift; Pesticides. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601118 |
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| Martínez Martínez, Talina Olivia. |
| La calidad sanitaria en los productos hortofrutícolas debe considerarse una prioridad en la producción de alimentos. Actualmente en México, existe una gran preocupación por las asociaciones de productores y gobierno federal para adoptar sistemas de producción que reduzcan riesgos de contaminación (SRRC). Para la implementación de estos sistemas, es necesario cumplir con una serie de requisitos, entre ellos se encuentra la validación de procesos. Un método inmediato para efectuar este requerimiento, es la evaluación de la calidad sanitaria desde el punto de vista microbiológico y toxicológico, lo que hace necesario determinar un plan de muestreo y las técnicas apropiadas para la detección y cuantificación de patógenos indicadores. Con este propósito, en... |
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Palavras-chave: Salmonella; Escherichia coli; Pesticides; Phenolic compounds; Survival; Sample size; Entomología y Acarología; Doctorado. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/590 |
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| Gamain, Perrine; Feurtet-mazel, Agnes; Maury-brachet, Regine; Auby, Isabelle; Pierron, Fabien; Belles, Angel; Budzinski, Helene; Daffe, Guillemine; Gonzalez, Patrice. |
| Dwarf eelgrasses (Zostera noltei) populations have decreased since 2005 in Arcachon Bay (southwest France). Various stressors have been pointed out, however the role of xenobiotics like pesticides or copper (Cu) and of parameters like water temperature warming have not yet been explored. To determine their impact, Z. noltei individuals were collected in a pollution-free site and transferred to the laboratory in seawater microcosms. This dwarf eelgrass was exposed to a pesticide cocktail and copper, alone or simultaneously, at temperatures (10 °C, 20 °C, 28 °C) representative of different seasons. After a two-week contamination, leaf growth, leaf bioaccumulation of Cu, and differential expression of target genes were studied. Eelgrasses bioaccumulated Cu... |
| Tipo: Text |
Palavras-chave: Zostera noltei; Arcachon Bay; Pesticides; Copper; Cellular impacts. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00407/51831/58536.pdf |
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| Lydy, Michael; Southern Illinois University at Carbondale; mlydy@siu.edu; Belden, Jason; Southern Illinois University at Carbondale; jbelden@siu.edu; Wheelock, Craig; University of California at Davis; cewheelock@ucdavis.edu; Hammock, Bruce; University of California at Davis; bdhammock@ucdavis.edu; Denton, Debra; U.S. Environmental Protection Agency; Denton.Debra@epamail.epa.gov. |
| This paper introduces the field of mixture toxicity and the challenges in regulating pesticide mixtures. Even though pesticides are unique chemical stressors designed to have biological activity that can affect a number of nontarget species, they are intentionally placed into the environment in large quantities. Currently, methods and terminology for evaluating mixture toxicity are poorly established. The most common approach used is the assumption of additive concentration, with the concentrations adjusted for potency to a reference toxicant. Using this approach, the joint action of pesticides that have similar chemical structures and modes of toxic action can be predicted. However, this approach and other modeling techniques often provide little insight... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: EPA; Additive toxicity; Concentration addition; Independent action; Mixtures; Pesticides; Regulations; Risk cup; Toxicity; Toxicity assessment. |
| Ano: 2004 |
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| Registros recuperados: 154 | |
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