Chemical Defenses
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Preference of Neoseiulus californicus (Acari: Phytoseiidae) for volatiles of Bt maize induced by multiple herbivory
ABSTRACT Plant indirect induced defenses against herbivores are characterized by the production of plant volatiles that to attract natural enemies. The objective of this study was to evaluate whether the attack of the two-spotted spider mite Tetranychus urticae or the multiple herbivory of T. urticae together with the fall armyworm Spodoptera frugiperda are
Rev. Bras. entomol.. Publicado em: 13/01/2020
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2. Evaluation of Chemical Defense and Chemical Diversity in the Exotic Bryozoan Amathia verticillata
The present investigation tests the effects against feeding by fishes of crude extracts obtained from eleven distinct populations of the bryozoan Amathia verticillata, an invasive species found globally in tropical to warm-temperate waters. Investigation of extracts from 11 populations of A. verticillata led to the identification and quantification of the kn
J. Braz. Chem. Soc.. Publicado em: 2017-03
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3. Benzoxazinoids: Reactivity and Modes of Action of a Versatile Class of Plant Chemical Defenses
In order to protect themselves from biotic stresses, including enemies and competitors, many plants recruit defensive secondary metabolites. Compounds containing a 2-hydroxy-2H-1,4-benzoxazin-3(4H)-one skeleton and their derivatives, collectively known as benzoxazinoids, are common secondary metabolites in many grasses, including important cereal crops such
J. Braz. Chem. Soc.. Publicado em: 2016-08
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4. Metabolite variability in Caribbean sponges of the genus Aplysina
Abstract Sponges of the genus Aplysina are among the most common benthic animals on reefs of the Caribbean, and display a wide diversity of morphologies and colors. Tissues of these sponges lack mineralized skeletal elements, but contain a dense spongin skeleton and an elaborate series of tyrosine-derived brominated alkaloid metabolites that function as chem
Rev. bras. farmacogn.. Publicado em: 2015-12
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5. Noctuidae-induced plant volatiles: current situation and prospects
Noctuids are phytophagous lepidopterans with some species causing significant damage to agriculture. The host plants, in turn, have developed defense mechanisms to cope with them, for instance chemical defenses. In this study we review the literature on plant volatiles induced by noctuids, and discuss the methodologies used to induce the production of volati
Quím. Nova. Publicado em: 2014
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6. Efeito da creatina e do piruvato sobre alguns parâmetros comportamentais e bioquímicos em ratos submetidos à administração intra-hipocampal de fenilalanina
The objective of this work was to investigate the possible preventive effect of pyruvate and creatine (substances with energetic and antioxidant properties) on the behavioral and biochemical alterations caused by intrahippocampal administration of phenylalanine (Phe) in Wistar rats. It was developed a experimental chemical model of phenylketonuria(PKU) by in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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7. Chemical defenses of the tropical marine seaweed Canistrocarpus cervicornis against herbivory by sea urchin
Este artigo demonstra a química defensiva anti-herbivoria da macroalga parda marinha Canistrocarpus cervicornis. Em sua concentração natural, o extrato bruto em diclorometano (DCE) inibiu significativamente o consumo alimentar do ouriço-do-mar Lytechinus variegatus. Deste extrato em DCE foi isolado o metabólito majoritário identificado como o diterpeno
Brazilian Journal of Oceanography. Publicado em: 2010-09
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8. Endossimbiose de Tetranychus evansi Baker e Pritchard (Acari: Tetranychidae) e a resposta de defesa induzida em tomateiro / Endosymbioses of Tetranychus evansi Baker and Pritchard (Acari: Tetranychidae) and tomato induced defence response
Interactions between arthropods and microorganisms have been receiving more attention due to the impact that these symbiotic associations causes on their macrosymbionts. Reproduction is the main biological parameters affected with cytoplasmic incompatibility and thelytokous parthenogenesis; however, endosymbionts can help arthropods to exploit host plants. I
Publicado em: 2010
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9. Anti-predator defense mechanisms in larvae of the butterfly Methona themisto (Nymphalidae: Ithomiinae) / Mecanismos de defesa contra predadores em larvas da borboleta Methona themisto (Nymphalidae: Ithomiinae)
Chemical defense in Lepidoptera involves several mechanisms such as sequestration of secondary metabolismcompounds of host plants and de novo synthesis of compounds that can provide some unpalatability or toxicity. The larvae of the butterfly Methona themisto (Nymphalidae: Ithomiinae) have a conspicuous coloration and feed exclusively on Brunfelsia uniflora
Publicado em: 2008
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10. Defesas foliares em resposta à herbivoria em espécies lenhosas de restinga,Ipojuca-PE
The leaf, the major photosynthetic plant organ, has the important function to adjust the plants to different habitats through morphological, chemical and physiological changes as a defense against the environmental factors. The chewing insects, the major consumers of leaf tissues, prejudice the behavior of the plants through the consumption of the photosynth
Publicado em: 2007
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11. Resistance induced in bean plants (Phaseolus vulgaris) by acibenzolar-S-methyl and Bacillus cereus: physiological and biochemical aspects, growth and production parameters / Indução de resistência em feijoeiro (Phaseolus vulgaris) por acibenzolar-S-metil e Bacillus cereus: aspectos fisiológicos, bioquímicos e parâmetros de crescimento e produção"
The induction of systemic resistance involves the activation of latent resistance mechanisms in plants against pathogens in response to the treatment with biotic or abiotic agents. The plants present latent defense system that can be activated with the goal of saving energy. Thus, the induced resistance under natural conditions will represent cost only in th
Publicado em: 2007
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12. Genetic structure and chemical defenses variaton in Brugmansia suaveolens (Solanaceae) / Estruturação genetica e variação de defesas quimicas em Brugmansia suaveolens (Solanaceae)
Populations patchily distributed tend to show high genetic structure and strong micro-evolutionary process evidences. Brugmansia suaveolens (Solanaceae) individuals are restrict to population patches. In this work, the genetic diversity of nine B. suaveolens populations was estimate by means of allozyme electrophoresis (chapter 1). Our results indicate high
Publicado em: 2006