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| Registros recuperados: 154 | |
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| Maggi, Pierre. |
| The effect of the 2 pesticides most frequently used against mosquitoes was tested on a number of marine organisms. Growth inhibition was tested using Phaeodactylum tricornutum and Gyrosigma spencer (algae). To 0.5 ml of culture inoculum containing similar to 100000 cells in exponential growth phase, 9.5 ml of insecticide in varying concentrations were added and the growth was recorded every 48 hour; LG sub(50) was determined. Muscular activity and filtration rate of Crassostrea angulata were tested. The acute toxicity was tested using 4 species of gastropods, 2 lamellibranchs, 5 crustaceans, 1 coelenterate and 3 fishes; the species used were: Gibbula umbilicalis, Purpura lapillus, Littorina littorea, Patella vulgata, Mytilus edulis, Cardium edule, Artemia... |
| Tipo: Text |
Palavras-chave: Marine organisms; Toxicity test; Fenitrothion; Abate; Pesticides. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-2229.pdf |
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| Sharma, A; Battersby, N; Stewart, D. |
| The Minimal Inhibitory Concentration (MIC) of a biocide is usually determined by adding it in various concentrations to a suitable growth medium which is then inoculated with the test bacterium. These cultures are then observed for up to 28 days for growth of the organism as shown by its production of black ferrous sulphide. A method has been developed whereby the MIC of a biocide can be found within 4 days. Instead of noting ferrous sulphide production, this new method measures changes in: 1) optical density and 2) sulphate reduction of a logarithmic culture of the test strain exposed to the biocide. |
| Tipo: Text |
Palavras-chave: Bacteria; Microorganisms; Pesticides; Analytical techniques; Sulfate reduction. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1016.pdf |
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| Portier, R; Meyers, S. |
| The environmental effect and fate of several agricultural and industrial source toxicants were evaluated in controlled laboratory microcosm systems in the presence of the aminopolysaccharide polymer, chitin. Toxicants examined included methyl parathion, phenol, pentachlorophenol, 2,4 dichlorophenol, 1,2 dichloroethane and Kepone. Microcosm operating parameters, including pH/Eh, salinity, temperature, flow rate and sediment/water interface conditions, were based on comparable in situ measurements. Fate analysis predictions were based on mineralization of the parent toxicant compound as measured by chromatographic analysis or super(14)CO sub(2) expiration. Chitin, amended to continuous flow microcosms, promoted either cometabolic or cooxidative... |
| Tipo: Text |
Palavras-chave: Controlled conditions; Chemical pollutants; Industrial wastes; Pesticides; Metabolism; Food webs; Biodegradation; Ecosystems; Microorganisms; Environmental effects; Brackishwater pollution; Estuaries; Toxicants; Chitin. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1011.pdf |
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| FAZOLIN, M.. |
| No Brasil, as perdas de grãos durante o armazenamento têm atingido níveis médios de 20%. No Acre, devido as precárias condições de armazenamento e os fatores climáticos favoráveis ao desenvolvimento das pragas, os níveis de perdas são superiores a 30%. Os insetos têm sido os agentes responsáveis por essas perdas, causando prejuízos quantitativos determinados pela perda de peso e prejuízos qualitativos causados pela depreciação do produto devido a presença de ovos, larvas, pupas, adultos e alterações na composição química do produto, além de facilitar o desenvolvimento de micro-organismos. Nas condições locais, 35% do arroz armazenado é atacado pelo gorgulho (Sitophilus zeamais) e 65% pela traça (Sitotroga cereealella). No controle dessas pragas alguns... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Maize weevil; Angoumois grain moth; Embrapa Acre; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Oriza sativa; Plagas de plantas; Control químico; Malatión; Plaguicidas.; Arroz; Praga de planta; Gorgulho dos cereais; Sitophilus zeamais; Traça dos cereais; Sitotroga cerealella; Controle químico; Inseticida; Campo Experimental.; Rice; Plant pests; Chemical control; Pesticides; Malathion.. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492345 |
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| Shumway, C. Richard; Chesser, Rayanne R.. |
| The impact of an ad valorem pesticide tax on cropping patterns and pesticide use was examined in the South Central Texas Crop Reporting District. Output supply equations were econometrically estimated and used in the simulation. A 25 percent tax on pesticide was estimated to have major impacts on cropping patterns and on pesticide use. Assuming other input and output prices were unaffected, the supply of one important crop would fall by more than half. Demand for some of the highly soluble and persistent pesticides, which present the greatest threat to groundwater quality, would also decrease substantially (some as much as 50 percent). |
| Tipo: Journal Article |
Palavras-chave: Crops; Dual model; Pesticides; Water quality; Supply; Crop Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/15433 |
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| Hubbell, Bryan J.. |
| The number of insecticide applications made by an apple grower to control an insect infestation is modeled as a geometric random variable. Insecticide efficacy, rate per application, month of treatment, and method of application all have significant impacts on the expected number of applications. The number of applications to control a given insect population is dependent on the probability of achieving successful control with a given application. Results suggest that northeastern growers have the highest and mid-Atlantic growers the lowest probability of controlling an infestation with a given application. Results also indicate that scales require the least and moths the most number of applications. Growers are not responsive to per unit insecticide... |
| Tipo: Journal Article |
Palavras-chave: Apples; Count data; Geometric; Insect control; Pesticides; Crop Production/Industries. |
| Ano: 1997 |
URL: http://purl.umn.edu/15047 |
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| OLIVEIRA, D. de A.; SILVA, A. de S.; SPADOTTO, C. A.. |
| O uso de pesticidas no Brasil é regulamentado pelos ministérios da Agricultura e Abastecimento, da Saúde, e do Meio Ambiente. Este estudo propõe um modelo matemático para relacionar as prescrições legais e o uso real de pesticidas. O modelo permite deduzir índices e indicadores, desde o nível mais baixo de agregação (uso de um pesticida por pulverização no campo), até o nível mais alto (estudo dos produtores). Três índices são deduzidos para: a) o ingrediente ativo; b) pulverização; c)cultura. Dois indicadores são também deduzidos para a) cultura por produtor; e b) produtores. A informação numérica permite, então, comparar entre diferentes produtos agrícolas e diferentes produtores, usando os chamados indicadores DAC, que medem a conformidade do uso de... |
| Tipo: Folhetos |
Palavras-chave: Indicador de qualidade; Qualidade de agua; Guaira; Monitoramento; Culturas agricolas; Produtor rural; Agrotóxico; Pulverização; Modelo matemático; Qualidade da água; Feijão; Milho; Soja; Tomate; Impacto Ambiental; Pesticides; Mathematical models. |
| Ano: 1998 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/12997 |
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| Registros recuperados: 154 | |
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