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| Registros recuperados: 41 | |
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| BARRERA,JENNIFER; CARRASCAL,JESÚS; NUMA,STEPHANIE; RODRÍGUEZ,DANIEL; CANTOR,FERNANDO. |
| La mosca blanca de los invernaderos, Trialeurodes vaporariorum, es una de las principales plagas de cultivos de tomate bajo invernadero y es controlada principalmente con insecticidas químicos. Sin embargo, existen estrategias alternativas de control como hongos entomopatógenos (Beauveria bassiana) y enemigos naturales como parasitoides (Encarsia formosa). En el presente estudio se evaluó la compatibilidad de productos comerciales con adultos y pupas de E. formosa bajo condiciones de laboratorio. Se evaluaron ocho tratamientos para pupas y adultos del parasitoide, incluyendo dos concentraciones del hongo entomopatógeno Beauveria bassiana (5 x 10(7) y 5 x 10(9) conidios/ml), dosis comerciales de cuatro productos comúnmente usados para el control de plagas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Beauveria bassiana; Control biológico; Control químico; Parasitoide. |
| Ano: 2013 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2013000200004 |
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| Moraes,Simone S.; Bautista,Ana Rita L.; Viana,Blandina F.. |
| Visando avaliar a toxicidade aguda de alguns inseticidas para Scaptotrigona tubiba (Smith) e discutir a aplicabilidade de testes de contato por aplicação tópica e filme seco, foram realizados testes com operárias capturadas na entrada da colméia e divididas em grupos de quatro repetições de cinco abelhas cada, sendo mantidas em placas de Petri forradas com papel de filtro por 48 h, com alimentação constante. Os produtos testados foram: deltametrina, Bacillus thuringiensis, triclorfom e malatiom diluídos em água destilada em concentrações crescentes de seus ingredientes ativos. No teste de filme seco, foram obtidas para o deltametrina, triclorfom e malatiom as CL50 de 0,70; 0,26 e 0,015 ppm, respectivamente. Para B. thuringiensis estimou-se uma CL50... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Abelhas sem ferrão; Toxicidade aguda; Deltametrina; Inseticidas organofosforados; Bacillus thuringiensis. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000100004 |
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| Fritz,Leila Lucia; Berlitz,Diouneia Lisiane; Macedo,Vera Regina Mussoi; Machado,Vilmar; Fiuza,Lidia Mariana. |
| Bacilos entomopatogênicos são bactérias observadas principalmente no solo, consideradas importantes agentes no controle biológico de doenças e pragas da agricultura. No entanto, existem poucos estudos que relatam a influência das práticas agrícolas nas populações de Bacillus spp. Essa pesquisa objetivou avaliar a freqüência de bactérias entomopatogênicas pertencentes ao gênero Bacillus obtidas de amostras de solo coletadas no ano agrícola de 2006/2007 de diferentes sistemas de cultivo de arroz irrigado da EEA-IRGA, Cachoeirinha (RS). Foram analisadas 36 amostras de solos, oriundas de três sistemas de plantio de arroz irrigado, pré-germinado (SPG), convencional (SPC), plantio direto (SPD) e de uma área sem plantio de arroz (C). Para tanto, um grama de solo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agroecossistemas; Bacilos entomopatogênicos; Sistemas de plantio; Bacillus thuringiensis; Bacillus sphaericus; Bacillus cereus. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000200020 |
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| Alarfaj,Abdullah A.; Arshad,Mohammed; Sholkamy,Essam N.; Munusamy,Murugan A. |
| ABSTRACTPolyhydroxybutyrate (PHB) is a renowned biodegradable plastic that do not release any toxins or residues in the environment like petroleum based plastics. In the present study, 50 bacteria isolated from mangrove niche, Saudi Arabia, were screened for maximum PHB production. All the 50 strains showed positive for PHB production, of which one strain showed maximum of 137 mgL-1. The most PHB accumulated bacterium was selected and identified asBacillus thuringiensis KSADL127, based on phenotypic characterization and 16S rRNA sequence analysis. Characterization of extracted PHB was carried out by FT-IR, NMR, UV spectroscopy, DSC, TGA, and LC-MS, which later confirmed the presence of intracellular accumulated polymer and substantiated as PHB. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangrove environments; Bacillus thuringiensis; Polyhydroxybutyrate (PHB). |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500781 |
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| Castilhos-Fortes,Raquel de; Matsumura,Aida T.S.; Diehl,Elena; Fiuza,Lidia M.. |
| The effects of Bacillus thuringiensis (Bt) Berliner on the termite Nasutitermes ehrhardti (Isoptera, Termitidae) were evaluated under laboratory conditions. From 55 Bt subspecies assayed in vivo under controlled conditions seven were found to be pathogenic in the subspecies yunnanensis, huazhongiensis, brasiliensis, colmeri and kurstaki (less than 72% of mortality), particularly sooncheon and roskildiensis (100% mortality at the seventh day after the bacteria application). The LC50 for subspecie sooncheon corresponded to 47x10(8),()66.2x10(6) and 5.1x10(5) cells/ml, at the third, fifth and seventh day, respectively. For the subspecie roskildiensis the LC50 corresponded to 30.8x10(5), 48.4x10(6) and 16.8x10(4) cells/ml, at the third, fifth and seventh day,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Biological control; Entomopathogenic bacteria; Nasutitermes ehrhardti; Termite. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000300006 |
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| Pinto,Laura M.N.; Dörr,Natália C.; Ribeiro,Ana Paula A.; Salles,Silvia M. de; Oliveira,Jaime V. de; Menezes,Valmir G.; Fiuza,Lidia M.. |
| The screening of Bacillus thuringiensis (Bt) Cry proteins with high potential to control insect pests has been the goal of numerous research groups. In this study, we evaluated six monogenic Bt strains (Bt dendrolimus HD-37, Bt kurstaki HD-1, Bt kurstaki HD-73, Bt thuringiensis 4412, Bt kurstaki NRD-12 and Bt entomocidus 60.5, which codify the cry1Aa, cry1Ab, cry1Ac, cry1Ba, cry1C, cry2A genes respectively) as potential insecticides for the most important insect pests of irrigated rice: Spodoptera frugiperda, Diatraea saccharalis, Oryzophagus oryzae, Oebalus poecilus and Tibraca limbativentris. We also analyzed their compatibility with chemical insecticides (thiamethoxam, labdacyhalothrin, malathion and fipronil), which are extensively used in rice crops.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Cry proteins; Insects. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000200025 |
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| Liang,Hongxia; Liu,Yao; Zhu,Jun; Guan,Peng; Li,Shuangcheng; Wang,Shiquan; Zheng,Aiping; Liu,Huainian; Li,Ping. |
| Sichuan basin, situated in the west of China, is the fourth biggest basin in China. In order to describe a systematic study of the cry2-type genes resources from Bacillus thuringiensis strains of Sichuan basin, a total of 791 Bacillus thuringiensis strains have been screened from 2650 soil samples in different ecological regions. The method of PCR-restriction fragment length polymorphism (PCR-RFLP) was used to identify the type of cry2 genes. The results showed that 322 Bacillus thuringiensis strains harbored cry2-type genes and four different RFLP patterns were found. The combination of cry2Aa/cry2Ab genes was the most frequent (90.4%), followed by cry2Aa (6.8%) and cry2Ab alone (2.5%), and only one novel type of cry2 gene was cloned from one isolate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; PCR-RFLP; SDS-PAGE; Novel cry2-type gene. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100018 |
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| Vilas-Bôas,Gislayne T.; Vilas-Bôas,Laurival A.; Braz,Veridiana T.; Saridakis,Halha O.; Santos,Clelton A.; Arantes,Olívia M. N.. |
| A mutant (407-P) of Bacillus thuringiensis subsp. thuringiensis strain 407 producing a melanin was obtained after treatment with the mutagenic agent ethyl-methane-sulfonate. Several microbiological and biochemical properties of the two strains were analyzed and the results were similar. The mutant 407-P was also incorporated into non-sterilized soil samples, recovered, easily identified, and quantified, what enables its use in ecology of B. thuringiensis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Melanin; Mutation; Ecol. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300012 |
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| Polanczyk,Ricardo Antonio; Silva,Rogério Fernando Pires da; Fiuza,Lidia Mariana. |
| The fall armyworm (Spodoptera frugiperda) is one of the most important pests of maize, causing up to 20% production losses when defoliation occurs near to flowering, or even complete destruction of plants. Among the alternatives to control this pest, the use of Bacillus thuringiensis (Bt) has gained attention due to its efficiency and low impact on natural enemies. Strains Bt dendrolimus HD 37, Bt aizawai HD 68, Bt kurstaki HD 73, Bt darmstadiensis HD 146, and Bt thuringiensis 4412 were tested against second instar larvae in in vivo assays. Suspensions of Bt aizawai HD 68 and Bt thuringiensis 4412, containing 3 x 10(8) cells/ml, induced mortality of 100% and 80.4%, respectively. To test virulence, cell concentrations of 8 x 10(5) to 3 x 10(8) cells/ml of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Spodoptera frugiperda; Biological control; Bioassays; Fall armyworm. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000300003 |
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| Haddad,Marinéia de Lara; Polanczyk,Ricardo Antonio; Alves,Sergio Batista; Garcia,Marcelo de Oliveira. |
| The persistence slope of Bacillus thuringiensis (Bt) based products in the field is an important parameter to evaluate their efficacy. The half-life, estimated based on persistence slope parameters, is one of the most effective tools to select microbial pesticides. The aim of this research was to study the relationship between viability loss of Bt spores on maize leaves and their concentration, comparing it with field persistence. The experimental design was split-plot on time, composed by maize plants, in which three concentrations (half, normal and double doses) of a Dipel commercial formulation were applied. In each plot three leaves in the upper part of three plants where randomly selected. Samples of these leaves were collected 3 to 72 hours after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Entomopathogen; Dipel; Maize leaves; Bacillus thuringiensis; Field persistence. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400001 |
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| Bobrowski,Vera Lucia; Fiuza,Lidia Mariana; Pasquali,Giancarlo; Bodanese-Zanettini,Maria Helena. |
| Os insetos constituem uma das principais causas de danos à produção agrícola no mundo. O controle de insetos tem sido realizado por meio de agroquímicos e, em muito menor escala, pelo emprego de inseticidas biológicos. As plantas transgênicas resistentes a insetos representam uma nova alternativa no combate aos insetos-praga das lavouras. A bactéria entomopatogênica Bacillus thuringiensis Berlinier (Bt) é a fonte dos genes de resistência nas chamadas plantas-Bt, produzidas comercialmente. No presente trabalho de revisão, são abordados os aspectos relacionados à bactéria Bt como fonte de genes de resistência a insetos-pragas, plantas geneticamente modificadas, vantagens do uso de plantas-Bt, bem como perspectivas dessa ferramenta biotecnológica. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Bt; Plantas transgênicas; Resistência a insetos; Insetos-praga; Delta-endotoxina. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000500008 |
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| Registros recuperados: 41 | |
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