Search results for "heliothis"

showing 6 items of 16 documents

Synergism and Antagonism between Bacillus thuringiensis Vip3A and Cry1 Proteins in Heliothis virescens, Diatraea saccharalis and Spodoptera frugiperda

2014

Made available in DSpace on 2015-03-18T15:56:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-10-02Bitstream added on 2015-03-18T16:28:28Z : No. of bitstreams: 1 WOS000342591500006.pdf: 270331 bytes, checksum: c280e3f5bc5e3bb0b92bf74d046135f0 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Spanish Ministry of Economy and Competivity FEDER Second generation Bt crops (insect resistant crops carrying Bacillus thuringiensis genes) combine more than one gene that codes for insecticidal proteins in the same plant to provide better control of agricultural pests. Some of the new combinations involve co-expression of cry and vip genes. Because Cry and Vip proteins …

InsecticidesBacillus thuringiensislcsh:MedicineSpodopteraSpodopteraDiatraea saccharalisHemolysin ProteinsLepidoptera genitaliaHemolysin ProteinsBacterial ProteinsBacillus thuringiensisBotanyGeneticsEscherichia coliAnimalslcsh:ScienceMolecular BiologyMultidisciplinarybiologyHeliothis virescensBacillus thuringiensis Toxinslcsh:RfungiBiology and Life SciencesAgriculturebiology.organism_classificationEndotoxinsLepidopteraBiochemistryCry1AcLarvalcsh:QElectrophoresis Polyacrylamide GelPest ControlAntagonismZoologyEntomologyResearch ArticleBiotechnologyProtein BindingPLoS ONE
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Bioactive chromenes from Rhyncholacis penicillata.

1994

Investigation of the aerial parts of Rhyncholacis penicillata afforded the new chromenes, 7-hydroxy-6-(3-methylbutyryl)-5-oxymethyl-chromene (rhynchonin A) and 7-hydroxy-6-(2-methylbutyryl)-6-oxymethylchromene (rhynchonin B). Structures were elucidated by spectroscopic methods and independent synthesis. Rhynchonin A showed broad insecticidal, acaricidal and nematicidal potency including strong biological activity against Heliothis zea.

InsecticidesMagnetic Resonance SpectroscopyMolecular StructureChemical structureAntinematodal AgentsHeliothis zeaBiological activityPlant ScienceGeneral MedicineHorticultureBiologyRhyncholacis penicillataPenicillataPlantsbiology.organism_classificationBiochemistryTicksBotanyPotencyOrganic chemistryAnimalsChromansMolecular BiologyPhytochemistry
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Mutations in the Bacillus thuringiensis Cry1Ca toxin demonstrate the role of domains II and III in specificity towards Spodoptera exigua larvae

2004

Several mutants of the Bacillus thuringiensis Cry1Ca toxin affected with regard to specific activity towards Spodoptera exigua were studied. Alanine was used to replace single residues in loops 2 and 3 of domain II (mutant pPB19) and to replace residues 541– 544 in domain III (mutant pPB20). Additionally, a Cry1Ca mutant combining all mutations was constructed (mutant pPB21). Toxicity assays showed a marked decrease in toxicity against S. exigua for all mutants, while they retained their activity against Manduca sexta, confirming the importance of these residues in determining insect specificity. Parameters for binding to the specific receptors in BBMV (brush border membrane vesicles) of S.…

Models MolecularMutantLaboratory of Virologyaminopeptidase nmedicine.disease_causeBiochemistrybrush-border membraneToxin oligomerizationSubstrate SpecificityBacterial toxin; Manduca sexta; Mode of action; Protoxin activation; Toxin oligomerization; Toxin receptor bindingHemolysin Proteinsmanduca-sextaBacillus thuringiensisheliothis-virescensAlanine:CIENCIAS DE LA VIDA::Bioquímica [UNESCO]MicrovillibiologyPRI BioscienceBiochemistryMode of actionLarvaThermodynamicsResearch ArticleProtein BindingBacterial Toxinspink-bollwormBacillus thuringiensisSpodopteraSpodopteraBinding CompetitiveManduca sextaLaboratorium voor VirologieBacterial ProteinsExiguamedicineirreversible bindingAnimalscrystal proteinsProtoxin activationProtein Structure QuaternaryMode of actionMolecular BiologyBacillus thuringiensis ToxinsToxin receptor bindingToxininsecticidal toxinpore formationCytoplasmic VesiclesfungiUNESCO::CIENCIAS DE LA VIDA::BioquímicaBacterial toxinCell Biologybiology.organism_classificationProtein Structure TertiaryEndotoxinsManduca sextaMutationcryia delta-endotoxins
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Mannose phosphate isomerase isoenzymes in Plutella xylostella support common genetic bases of resistance to Bacillus thuringiensis toxins in Llpidopt…

2001

ABSTRACT A strong correlation between two mannose phosphate isomerase (MPI) isoenzymes and resistance to Cry1A toxins from Bacillus thuringiensis has been found in a Plutella xylostella population. MPI linkage to Cry1A resistance had previously been reported for a Heliothis virescens population. The fact that the two populations share similar biochemical, genetic, and cross-resistance profiles of resistance suggests the occurrence of homologous resistance loci in both species.

PopulationBacterial ToxinsBacillus thuringiensisDrug ResistanceIsomeraseApplied Microbiology and BiotechnologyMicrobiologyHemolysin ProteinsBacterial ProteinsBacillus thuringiensisInvertebrate MicrobiologyAnimalseducationPest Control BiologicalGeneticseducation.field_of_studyMannose-6-Phosphate IsomeraseEcologyHeliothis virescensbiologyBacillus thuringiensis ToxinsMannose phosphate isomeraseParasporal bodyfungiPlutellaMannose-6-Phosphate Isomerasebiology.organism_classificationEndotoxinsIsoenzymesLepidopteraElectrophoresis Polyacrylamide GelFood ScienceBiotechnologyApplied and environmental microbiology
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Resistance toBacillus thuringiensis Cry1Ac toxin in three strains ofHeliothis virescens: Proteolytic and SEM study of the larval midgut

1999

In a previous study, we demonstrated that resistance to Bacillus thuringiensis toxins in Heliothis virescens might be related to differences in the composition of the proteolytic extracts from insect midgut. There, we found specific proteolytic bands present in the gut extracts of the resistant strain and absent from the susceptible one. Here we report related facts using a new resistant strain (KCB) and a cross between the two strains used in our previous study. As would be expected, no quantitative differences in total proteolytic activity were found between the strains, although qualitative differences related to the presence or absence of specific proteolytic activity bands using SDS-PA…

ProteasesStrain (chemistry)Heliothis virescensbiologyPhysiologyToxinmedia_common.quotation_subjectfungiMidgutGeneral MedicineInsectmedicine.disease_causebiology.organism_classificationBiochemistryMicrobiologyCry1AcInsect ScienceBacillus thuringiensismedicinemedia_commonArchives of Insect Biochemistry and Physiology
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The Mighty Bt: Interactions between pests and pesticidal proteins from Bacillus thuringiensis

2022

Bacillus thuringiensis, también conocida como “Bt”, es una bacteria gram positiva que forma endosporas. Se trata de un organismo ubicuo, aunque se encuentra principalmente en el suelo o en ambientes con alta presencia de insectos. Fue aislada por primera vez en 1901 por el bacteriólogo Shigetane Ishiwata en muestras de intestino de gusanos de seda (Bombyx mori) infectados y fue apodada como “Sottokin- Bacillus” (“Bacilo de muerte súbita”) por la muerte que causaba cuando era ingerida por larvas de gusanos de seda. Pocos años después, el biólogo Ernst Berliner aisló B. thuringiensis de crisálidas de polilla mediterránea de la harina (Ephestia kuehniella) infectadas con esta bacteria en la pr…

ostriniathuringiensisUNESCO::CIENCIAS DE LA VIDAspodopteratoxinas btheliothis:CIENCIAS DE LA VIDA [UNESCO]
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