Bt Cotton
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Estudo da atividade de proteínas Cry, derivadas de bacilos thuringiensis ativas para insetos-praga do algodoeiro
Cry toxins from Bacillus thuringiensis (Bt) are isecticidal proteins used for insect control. They actin by ingetion and are activated by host proteases and interact with specific receptors located on the host cell surface, resulting in midgut epithelial cells lysis. This work is divided in four chapters. In the first, a review was done o Bacillus, ecology a
Publicado em: 2009
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14. Experimental infections with Paracoccidioides brasiliensis obtained from armadillos: comparison to clinical isolates
Paracoccidioides brasiliensis causes paracoccidioidomycosis (PCM) that is one of the most prevalent systemic human mycoses in Latin America. Armadillos show a high incidence of PCM infection and could, therefore, be a natural reservoir for this fungus. In this study were compared the virulence profiles of isolates obtained from nine-banded armadillos (Dasypu
Brazilian Journal of Infectious Diseases. Publicado em: 2008-02
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15. INTERACTION BETWEEN THE COTTON BOLLGARDTM, THE TWOSPOTED SPIDER MITE, Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) AND ITS PREDATORY MITE Phytoseiulus macropilis (BANKS) (ACARI: PHYTOSEIIDAE). / INTERAÇÃO ENTRE O ALGODOEIRO BOLLGARDTM, O ÁCARO RAJADO, Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) E O PREDADOR Phytoseiulus macropilis (BANKS) (ACARI: PHYTOSEIIDAE)
Cotton plants have been genetically transoformed with genes from the bacterium Bacillus thuringiensis Berliner (Bt) which confers the plant resistance against certain lepidopoteran pest species. The Bt-cotton carries genes that express the toxin Cry1Ac. This creates new interactions in the agroecossystems encouraging researches to answer the questions about
Publicado em: 2008
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16. Distribuição Espacial de Insetos em Algodoeiro Bt e não-Bt / Spatial Distribution of Alabama argillacea (Hübner) and Heliothis virescens (Fabricius) (Lepidoptera, Noctuidae) Eggs on Bt and Non-Bt Cotton
Among the several options for controlling Alabama argillacea (Hübner) and Heliothis virescens (Fabricius) larvae on the cotton crop, as insecticides spraying and biological control, the transgenic Bt-cotton has been inserted as an extremely viable alternative, however it is not known with accuracy as the transgenic plants affect the populations of organisms
Publicado em: 2008
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17. Distribuição Espacial de Insetos em Algodoeiro Bt e não-Bt / Spatial Distribution of Alabama argillacea (Hübner) and Heliothis virescens (Fabricius) (Lepidoptera, Noctuidae) Eggs on Bt and Non-Bt Cotton
Dentre as opções para o controle de lagartas de Alabama argillacea (Hübner) e Heliothis virescens (Fabricius) na cultura algodoeira tem-se, normalmente, a aplicações de inseticidas e o controle biológico. Nesse contexto, o algodão transgênico Bt tem se inserido como uma alternativa extremamente viável, porém não se sabe, com exatidão, como as pla
Publicado em: 2008
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18. Effect of Bt cotton (Bollgard event 531) on the bacterial community of the rhizosphere. / Efeitos do algodão Bt (Bollgard evento 531) na comunidade bacteriana da rizosfera.
O algodão transgênico Bollgard® (algodão Bt) contém o gene cry1Ac da bactéria Bacillus thuringiensis, que confere a planta resistência a Lepidopteros. A expressão deste gene na planta pode acarretar efeitos ecológicos adversos à microbiota do solo e da rizosfera. Em casa-de-vegetação, a comunidade bacteriana associada ao algodão Bt foi comparada
Publicado em: 2008
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19. Impacto do algodoeiro geneticamente modificado (Bollgard) sobre a biodiversidade de artrópodes
O impacto da cultivar de algodoeiro transgênica NuOpal (Bollgard), a qual expressa o gene Cry1Ac da bactéria Bacillus thuringiensis (Bt) que produz proteína de efeito inseticida contra os lepidópteros Alabama argillacea (Hübner, 1823), Heliothis virescens (Fabricius, 1781) e Pectinophora gossypiella (Saunders, 1844) foi avaliado no campo durante a safra
Publicado em: 2008
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20. Impacto do algodoeiro geneticamente modificado (Bollgard) sobre a biodiversidade de artrópodes
O impacto da cultivar de algodoeiro transgênica NuOpal (Bollgard), a qual expressa o gene Cry1Ac da bactéria Bacillus thuringiensis (Bt) que produz proteína de efeito inseticida contra os lepidópteros Alabama argillacea (Hübner, 1823), Heliothis virescens (Fabricius, 1781) e Pectinophora gossypiella (Saunders, 1844) foi avaliado no campo durante a safra
Publicado em: 2008
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21. Investigation of a novel Bacillus thuringiensis toxin
The aim of the present work was to investigate the toxicity, biochemical characteristics, gene and protein contents, and the mechanism of action of toxins from the Brazilian Bacillus thuringiensis (Bt) strain S725. This strain has been reported as toxic against the cotton boll weevil (Anthonomus grandis), a severe pest of cotton crops in America, which is co
Publicado em: 2006
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22. Long-term regional suppression of pink bollworm by Bacillus thuringiensis cotton
Despite the potentially profound impact of genetically modified crops on agriculture and the environment, we know little about their long-term effects. Transgenic crops that produce toxins from Bacillus thuringiensis (Bt) to control insects are grown widely, but rapid evolution of resistance by pests could nullify their benefits. Here, we present theoretical
The National Academy of Sciences.
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23. Frequency of resistance to Bacillus thuringiensis in field populations of pink bollworm
Strategies for delaying pest resistance to genetically modified crops that produce Bacillus thuringiensis (Bt) toxins are based primarily on theoretical models. One key assumption of such models is that genes conferring resistance are rare. Previous estimates for lepidopteran pests targeted by Bt crops seem to meet this assumption. We report here that t
The National Academy of Sciences.
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24. Three cadherin alleles associated with resistance to Bacillus thuringiensis in pink bollworm
Evolution of resistance by pests is the main threat to long-term insect control by transgenic crops that produce Bacillus thuringiensis (Bt) toxins. Because inheritance of resistance to the Bt toxins in transgenic crops is typically recessive, DNA-based screening for resistance alleles in heterozygotes is potentially much more efficient than detection of res
The National Academy of Sciences.