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| Registros recuperados: 154 | |
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| ALVES,JODEL S.; SILVA,FERNANDA R. DA; SILVA,GABRIELI F. DA; SALVADOR,MIRIAN; KVITKO,KÁTIA; ROHR,PAULA; SANTOS,CARLA E.I. DOS; DIAS,JOHNNY F.; HENRIQUES,JOÃO A.P.; SILVA,JULIANA DA. |
| ABSTRACT Agricultural workers involved in the harvest of tobacco crops are regularly exposed to large quantities of pesticides. In order to determine how this exposure to pesticides induces genetic alterations in these workers, blood samples were obtained from 77 exposed individuals, as well as from 60 unexposed subjects. DNA damage was analyzed by the Comet assay and by the micronucleus (MN) test. The antioxidant profile was evaluated by activity of superoxide dismutase (SOD), and the polymorphism of gene PON1 was used as a susceptibility biomarker. The content of inorganic elements in the blood samples was determined by PIXE analysis. Our results demonstrated that the damage frequency, damage index, the MN frequency, and the SOD activity were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Comet assay; Micronucleus test; Superoxide dismutase activity; PON1 gene. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100349 |
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| FELICIO,ANA LUCIA S.M.; MONTEIRO,ALESSANDRA M.; ALMEIDA,MARIANA B.; MADEIRA,TIAGO B.; NIXDORF,SUZANA L.; YABE,MARIA JOSEFA S.. |
| ABSTRACT Diuron is one of the most widely herbicide used worldwide, which can undergo degradation producing three primary metabolites: 3,4-dichlorophenylurea, 3-(3,4-dichlorophenyl)-1-methylurea, and 3,4-dichloroaniline. Since the persistence of diuron and its by-products in ecosystems involves risk of toxicity to environment and human health, a reliable quantitative method for simultaneous monitoring of these compounds is required. Hence, a simple method without preconcentration step was validated for quantitation of diuron and its main metabolites by high performance liquid chromatography with ultraviolet detection. Separation was achieved in less than 11 minutes using a C18 column, mobile phase composed of acetonitrile and water (45:55 v/v) at 0.86 mL... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Degradation products; HPLC-UV; Soil; Environmental control. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401235 |
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| Stoyanova,Stela; Yancheva,Vesela Slavcheva; Velcheva,Iliana; Uchikova,Ekaterina; Georgieva,Elenka. |
| ABSTRACTThe present study aimed to investigate the histological alterations in common carp gills caused by a fosetyl-Al and fenamidone based fungicide tested in laboratory conditions at 30, 38 and 50 mg/L concentration. In general, all the tested concentrations activated compensatory-adaptive mechanisms, which caused pathological changes in the fish gills. Results showed different histological alterations in the gill structure, which included lamellar lifting, edema, proliferation of the glandular cells and epithelium, covering the gill filament, fusion and degenerative alterations. Blood circulatory system showed vasodilatation of the secondary lamellae and aneurysms. Overall, there was enhancement of the gill histological changes, which was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Histology; Fish; Gills; Pesticides; Contamination; Biomarkers. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500757 |
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| Arroyo-Salgado,Bárbara; Olivero-Verbel,Jesús; Guerrero-Castilla,Angélica. |
| ABSTRACT Contact with the pesticide dichlorodiphenyltrichloroethane (p,p′-DDT) can be the cause of various harmful effects in humans, wildlife, and the environment. This pesticide is known to be persistent, lipophilic, resistant to degradation, and bioaccumulive in the environment and to be slowly released into bloodstream. Growing evidence shows that exposure to DDT is linked to type 2 diabetes mellitus. Individuals exposed to elevated levels of DDT and its metabolite have an increased prevalence of diabetes and insulin resistance. To evaluate these possible relationships, experiments were performed on eight-week-old female mice, divided into three groups (n = 10 per group): Group 1 received a vehicle-control intraperitoneal (i.p.) injection of sesame... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Persistent organic pollutant; Dichlorodiphenyltrichloroethane/exposure; Type 2 diabetes mellitus/exposure to dichlorodiphenyltrichloroethane/experimental study; Insulin/resistance/exposure to dichlorodiphenyltrichloroethane; Gene expression. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502016000200287 |
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| Junod,Julio; Zagal,Erick; Sandoval,Marco; Barra,Ricardo; Vidal,Gladys; Villarroel,Mario. |
| Water flows provided by irrigation systems may be associated with dissolved organic carbon (DOC) content in the soil solution and may modify the mobility of pesticides, such as chlorpyrifos (CHP). These compounds were analyzed under field conditions, evaluating their distribution in the soil profile under excessive irrigation in a Humic Haploxerand soil. The trial was carried out in soil columns located under the canopy of apple trees (Malus domestica Borkh.) in an orchard located in the Bío-Bío Region, Chile. The insecticide CHP was applied 120 g hL-1, and later the natural run off was collected from the foliage to the columns. Surface irrigation was used as a control, the equivalent to 4 L h-1 weekly, plus two treatments over the columns of 6 and 8 L h-1... |
| Tipo: Journal article |
Palavras-chave: Pesticides; Organic matter; Volcanic soil. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300017 |
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| Pratissoli,Dirceu; Milanez,André M.; Barbosa,Wagner F.; Celestino,Flávio N.; Andrade,Gilberto S.; Polanczyk,Ricardo A.. |
| Trichogramma spp. (Hymenoptera: Trichogrammatidae) can control Diaphania hyalinata Linnaeus (Lepidoptera: Pyralidae). On the other hand, pesticides may reduce the efficiency of natural enemies. The objective was to evaluate the side-effects of fungicides used in the production of cucurbitaceous crops on Trichogramma atopovirilia Oatman & Platner parasitizing D. hyalinata eggs. The fungicides used in bioassays were: azoxystrobin (0.08 g active ingredient [ai] L-1), chlorothalonil (2.00 g ai L-1), mancozeb (1.60 g ai L-1), tebuconazole (0.25 g ai L-1) and thiophanate-methyl (0.49 g ai L-1). Cardboards with 30 D. hyalinata eggs previously immersedin fungicide solutions and distilled water (control) were offered separately to 20 newly emerged T.... |
| Tipo: Journal article |
Palavras-chave: Cucurbit borer; Pesticides; Egg parasitoid; Selectivity. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000200016 |
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| Quintero,Juan C; Moreira,María T; Feijoo,Gumersindo; Lema,Juan M. |
| White-rot fungi have demonstrated a high capacity to degrade organic pollutants, including the insecticide lindane (y-HCH). The purpose of this study was to evalúate the degradative capacities of several white rot fungi species, Bjerkandera adusta, Irpex lacteus, Lentinus tigrinus, Phanerochaete chrysosporium, Phanerochaete sórdida, Phlebia radiata, Pleurotus eryngii, Poliporus cialatus, and Stereum hirsutum. Fungal tolerance to various concentrations of a-, (3-, y- and 8 isomers of hexachlorocyclohexane (HCH) was studied in both liquid and soil media samples. 8- and y-HCH isomers showed the highest inhibition of fungal growth of all HCH isomers. P. chrysosporium and B. adusta exhibited a high tolerance to HCH pollution. The 8- and y-HCH isomers were... |
| Tipo: Journal article |
Palavras-chave: Hexachlorocyclohexane; Degradation; Pesticides; Bjerkandera adusta; White rot fungi. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200005 |
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| Pelaez,Victor; Mizukawa,Gabriel. |
| ABSTRACT: The pesticide industry has undergone a diversification process led by six leading companies (Monsanto, Syngenta, Bayer, Dow, DuPont, BASF) that control roughly 68% of the world market. This growth, initiated in the second half of the 1990s, occurred through deals and acquisitions of companies from the seed and biopesticide markets. This paper analyzes these diversification strategies, which have involved a capital mobilization process based on the exploitation of economies of scope and management of complementary assets. This aims to minimize the risks of investment in consolidated markets as well as in new ones. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Seeds; Biopesticides; Diversification; Growth. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200152 |
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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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| Costa,Denilson Bezerra; Souza,Brígida; Carvalho,Geraldo Andrade; Carvalho,César Freire. |
| ABSTRACT - This work was designed to evaluate the residual action of the insecticides trichlorfon, triflumuron, endosulfan, fenpropathrin, chlorpirifos, tebufenozide and esfenvalerate, sprayed on cotton plants, to second-instar larvae of Chrysoperla externa (Hagen, 1861), under greenhouse conditions. The experimental design was completely randomized with ten replicates. Three larvae were released on each plant, in the 1st, 12th and 23rd day after pesticides spray. Tebufenozide and esfenvalerate were little persistent (class one), while trichlorfon, triflumuron and endosulfan were slightly persistent, decreasing the survival of C. externa larvae over 30%, up to 14 days after spray. Fenpropathrin and chlorpirifos caused mortality over 30%, up to 25 days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Selectivity; Predator; Pesticides; Cotton. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000400014 |
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| Registros recuperados: 154 | |
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