Organophosphorus Compounds
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Occurrence of Pesticides Associated to Atmospheric Aerosols: Hazard and Cancer Risk Assessments
Since the 1950s, pesticides have been used in agriculture. The increase in their consumption has been observed in recent years. In this work, it was determined the concentration of pesticides in the atmosphere of São Paulo and Piracicaba cities (sugarcane plantation site) and the hazard quotients and cancer risk caused by inhalation of these compounds were
J. Braz. Chem. Soc.. Publicado em: 2020-06
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2. One-Pot Synthesis of NEMP, a VX Surrogate, and Reactivation of NEMP-Inhibited Electrophorus Eel Acetylcholinesterase by Current Antidotes
The use of nerve agents, organophosphorus compounds which irreversibly inhibit acetylcholinesterase, in conflicts and terrorism has gained renewed geopolitical status in recent years. As no “universal antidote” has ever been produced, the development of antidotes to reactivate enzyme is clearly warranted. Given the fact that nerve agents are restricted s
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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3. ORGANOCLORATED AND ORGANOPHOSPHORUS PESTICIDES IN THE PELOTAS RIVER SEDIMENT
ABSTRACT Aquatic sediments are widely used for the evaluation of anthropogenic contamination due to their ability to adsorb particles and contaminants, making them historical environmental archives. Therefore, the objective was to evaluate the contamination of the Pelotas River sediments, at the border between the states of Santa Catarina and Rio Grande do S
Eng. Agríc.. Publicado em: 2018-01
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4. Structure-flammability relationship study of phosphoester dimers by MLR and PLS
Abstract Polyphosphonates and polyphosphates having good flame retardancy represent an important class of organophosphorus based polymer additives. In this analysis the flammability of 28 previously synthesized polyphosphoesters, modelled as dimmers, was explored using the multiple linear regression (MLR) and Partial Least Square (PLS) methodology. The stati
Polímeros. Publicado em: 14/06/2016
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5. Neurotoxic Effects Associated with Current Uses of Organophosphorus Compounds
Organophosphorus compounds (OPs) are a large and diverse class of chemicals that have been synthesized, since the XIX century for several purposes like chemical weapons, flame-retardants, ectoparasiticides and investigational new drugs, but mainly as agrochemicals in agriculture and indoor. Although the amount of OP pesticides being used is declining, especi
J. Braz. Chem. Soc.. Publicado em: 2016-05
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6. A procura de bactérias degradadoras de metamidofós. / Searching for methamidofos degrading bacteria.
Methamidophos is a strong acetylcholinesterase inhibitor and, therefore, a very toxic organophosphorus insecticide. This product has been widely employed for pest control in a variety of cultures, but little information is available about its biodegradation. 12 bacteria were isolated and characterized, from water and soil samples obtained from a site contami
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/09/2011
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7. Avaliação da exposição ocupacional a praguicidas organofosforados em estufas de flores na região do Alto Tietê - São Paulo / Evaluation of occupational exposure to organophosphate pesticides in greenhouses of flower in the Alto Tietê region, state of S. Paulo, Brazil
The state of São Paulo - Brazil, accounts for 70% of domestic production of flowers and ornamental plants. Currently, these crops occupy 7.5 thousand hectares and over 50% of this area is cultivated in greenhouses. This market has an average of 8.000 producers and generates around 200.000 jobs. Greenhouses are microcosms designed to provide environmental co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/09/2011
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8. Bases moleculares da resistência a inseticidas organofosforados na mosca praga da pecuaria Cochliomyia hominivorax (Diptera: Calliphoridae) / Molecular basis of resistance to organophosphate insecticidein Cochiliomya Hominivorax (Diptera: Calliphoridae)
A mosca-da-bicheira, Cochliomyia hominivorax, é uma das principais moscas causadoras de miíases da América do Sul, sendo responsável por severos prejuízos à pecuária através da mortalidade e redução da produtividade dos animais infestados. No Brasil, o seu controle tem sido realizado principalmente através da aplicação de inseticidas organofosfo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2010
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9. Síntese, caracterização e estudos biológicos de novas dialquilfosforilidrazonas derivadas de cetonas. / New Dialkylphosphorylydrazones: Synthesis, Characterization and Evaluation of Biological Activity. Seropédica, UFRRJ, 2007.
A series of twelve novel organophosphorus compounds, derived from dialkylphosphorylydrazone ketones were synthesized in three steps of reaction: the first step is the synthesis of various dialkyl phosphonates which are obtained by reaction of phosphorus trichloride (PCl3) with three Mols the corresponding alcohois. In the second step, the reaction of the dia
Publicado em: 2009
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10. Organophosphorus compounds as chemical warfare agents: a review
Os agentes de guerra química constituem uma das maiores ameaças do mundo moderno. Dentre estes, destacam-se os agentes neurotóxicos, em virtude de sua alta letalidade e periculosidade. Eles são compostos organofosforados que atuam pela inibição da enzima acetilcolinesterase, a qual é fundamental no processo de transmissão de impulsos nervosos. Existe
Journal of the Brazilian Chemical Society. Publicado em: 2009
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11. Cytotoxic and genotoxic effects of Br-containing oxaphosphole on Allium cepa L. root tip cells and mouse bone marrow cells
The continuous production and release of chemicals into the environment has led to the need to assess their genotoxicity. Numerous organophosphorus compounds with different structures have been synthesized in recent years, and several oxaphosphole derivatives are known to possess biological activity. Such chemical compounds may influence proliferating cells
Genetics and Molecular Biology. Publicado em: 2009
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12. Compostos organofosforados pentavalentes: histórico, métodos sintéticos de preparação e aplicações como inseticidas e agentes antitumorais
This paper is a review of the history, synthesis and application of organophosphorus compounds, especially of those of pentavalent phosphorus, such as phosphoramidates, phosphorothioates, phosphonates and phosphonic acids with insecticide and anticancer activities. The organophosphorus compounds with agrochemical applications show great structural variety, T
Química Nova. Publicado em: 2007-02