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| Registros recuperados: 11 | |
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| Fang,Longfa; Wang,Bo; Zhou,Zishan; Yang,Sujuan; Shu,Changlong; Song,Fuping; Bravo,Alejandra; Soberón,Mario; Zhang,Jie. |
| Background: Bacillus thuringiensis Cry toxins bind with different insect midgut proteins leading to toxin oligomerization, membrane insertion and pore formation. However, different Cry toxins had been shown to readily form high molecular weight oligomers or aggregates in solution in the absence of receptor interaction. The role of Cry oligomers formed in solution remains uncertain. The Cry9A proteins show high toxicity against different Lepidoptera, and no-cross resistance with Cry1A. Results: Cry9Aa655 protein formed oligomers easily in solution mediated by disulfide bonds, according to SDS-PAGE analysis under non-reducing and reducing conditions. However, oligomerization is not observed if Cry9Aa655 is activated with trypsin, suggesting that cysteine... |
| Tipo: Journal article |
Palavras-chave: Cry9Aa655; Disulfide bonds; Oligomerization; Insecticidal activity. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000300006 |
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| Trindade,Roseane Cristina Prédes; Silva,Paulo Pedro da; Araújo-Júnior,João Xavier de; Lima,Ivanildo Soares de; Paula,José Elias de; Sant'Ana,Antônio Euzébio Goulart. |
| The objective of this work was to assess the effects of Aspidosperma pyrifolium ethanol extracts on cabbage moth (Plutella xylostella) larvae. The ethanol extracts of the stem bark, fruits and roots of A. pyrifolium were obtained by classical phytochemical methods, and the resulting subfractions were tested on P. xylostella, using 4 and 5 mg L-1. The crude ethanol extract of the stem bark was more lethal. The alkaloid-rich aqueous subfraction derived from the stem bark extract caused 100% larval mortality at 4 mg L-1. Insecticidal activity was associated with the presence of the monoterpenoid indole alkaloids aspidofractinine, 15-demethoxypyrifoline, and N-formylaspidofractinine. These alkaloids presented excellent insecticidal properties against P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alkaloids; Cabbage moth; Insecticidal activity; Organic extracts; Pereiro-do-sertão. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001200024 |
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| Rueda,Andrés G.; Carreño Otero,Aurora L.; Duque,Jonny E.; Kouznetsov,Vladimir V.. |
| Abstract Aedes aegypti is the principal vector of arboviral pathogens that may cause diseases as dengue fever, chikungunya and zika. The harmful environmental effects of commercial pesticides coalesced with the development of insecticide-resistant populations encourage the discovery and generation of new alternative products as a tool to reduce the incidence of vector-borne diseases. In this work, through the classic three component Strecker reaction of commercial benzaldehydes, cyclic secondary amines and KCN, a new series of nine α-amino nitriles, girgensohnine analogs, has been synthetized and screened for larvicide and adulticide properties against A. aegypti, one of the dominant vectors of dengue, chikungunya and zika in tropical and subtropical areas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arthropod-borne diseases; Girgensohnine analogs; Strecker reaction; Insecticidal activity; Vector control. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000200112 |
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| Li,L.; Song,X.; Yin,Z.; Jia,R.; Zou,Y.. |
| ABSTRACT In this study, neem leaves were successively extracted with petroleum ether, 95% ethanol and water and the insecticidal activities of these extracts against Oxya chinensis larvae were measured. The results showed that 95% ethanol extract gave the highest extraction yield and insecticidal activity, and it was further extracted with five different solvents. The petroleum ether extract from the 95% ethanol extract possessed the highest insecticidal activity with median lethal concentration values ranging from 14.93 to 55.66mg/mL. The gas chromatography-mass spectrometer analysis showed that the petroleum ether extract mainly composed of alkanes, olefin, esters and amide. The pathological examination revealed that the prominent lesions, including... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neem leaves; Oxya chinensis; Insecticidal activity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000100001 |
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| Berlitz,Diouneia Lisiane; Azambuja,Aline Oliboni de; Sebben,Alessandra; Oliveira,Jaime Vargas de; Fiuza,Lidia Mariana. |
| Oryzophagus oryzae (Costa Lima 1936) (Coleoptera: Curculionidae) and Spodoptera frugiperda (J E Smith, 1797) (Lepidoptera: Noctuidae) cause important crop losses in southern Brazil. Control is possible by the use of the bacteria Bacillus thuringiensis and extracts of Melia azedarach. This study aimed to evaluate the mortality, in vivo, of O. oryzae and S. frugiperda submitted to two isolates of B. thuringiensis and the aqueous extract of M. azedarach. The LC50 for O. oryzae due to bacteria was 5.40μg/mL (Bt 2014-2) and due to plant extract 0.90μg/mL. For S. frugiperda, the Bt 1958-2 bacterial suspension (1.10(10)UFC/mL) caused a 100% of corrected mortality, showing that the purified Cry proteins caused a CL10 of 268μg/mL five days after the treatments, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alternative pest control; Entomopathogenic bacteria; Insecticidal activity; Botanical insecticidal. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000500012 |
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| Azizoglu,Ugur; Ayvaz,Abdurrahman; Yılmaz,Semih; Karabörklü,Salih; Temizgul,Rıdvan. |
| ABSTRACT In this study, the cry1Ab gene of previously characterized and Lepidoptera-, Diptera-, and Coleoptera-active Bacillus thuringiensis SY49-1 strain was cloned, expressed and individually tested on Ephestia kuehniella (Lepidoptera: Pyralidae) and Plodia interpunctella (Lepidoptera: Pyralidae) larvae. pET-cry1Ab plasmids were constructed by ligating the cry1Ab into pET28a (+) expression vector. Constructed plasmids were transferred to an Escherichia coli BL21 (DE3) strain rendered competent with CaCl2. Isopropyl β-D-1-thiogalactopyranoside was used to induce the expression of cry1Ab in E. coli BL21(DE3), and consequently, ∼130 kDa of Cry1Ab was obtained. Bioassay results indicated that recombinant Cry1Ab at a dose of 1000 µg g-1 caused 40% and 64%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bt SY49-1; Gene cloning; Recombinant Cry1Ab; Insecticidal activity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300597 |
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| Registros recuperados: 11 | |
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