Chemical Defenses
Mostrando 13-24 de 30 artigos, teses e dissertações.
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13. Estudo das interaÃÃes planta-herbÃvoro em Laguncularia racemosa (L.) GAERTEN (COMBRETACEAE) no manguezal de MaracaÃpe, Ipojuca, PE
Interspecific competition is an important force in the ecology of the populations and communities of herbivores. An example that has been neglected is the competition between inductors of gall. These if characterize for being an atypical fabric transformation and/or vegetal agency, being able to be caused by mites, insects, etc. Better to understand the inte
Publicado em: 2006
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14. Implicações toxicologicas e bioquimicas de xenobioticos em Curimbata (Prochilodus scrofa, Steindachnner, 1881) um peixe tropical brasileiro
Cytochromes P450 constitute a superfamily of hemeproteins that play a vital role in the metabolism of a wide variety of compounds such as steroids, fatty acids, drugs and environmental pollutants. Xenobiotic metabolism and role of cytochrome P450 are important areas of molecular pharmacology and toxicology, and of great interest mainly in the studies on prev
Publicado em: 2002
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15. Relação médico-paciente e a morte
To be a doctor, in this period, at the tuming of the millenniumseems to be more challenging: if on one side there is an increase of technical demands, larger amount of knowledge, technological perfectionism has algo increased the emotional demands being expected from this gentile and cordial relationship, propitiating a softy climate and trust to the patient
Publicado em: 2001
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16. Chemical defenses of the endemic Brazilian gorgonian Lophogorgia violacea Pallas (Octocorallia, Gorgonacea)
O mecanismo de defesa contra predadores no octocoral brasileiro Lophogorgia violacea foi investigado através de ensaios de preferência alimentar em campo frente a predadores. Os ensaios de palatabilidade com o extrato bruto da gorgônia demonstraram que seus metabólitos secundários possuem atividade deterrente significativa frente a peixes generalistas.
Journal of the Brazilian Chemical Society. Publicado em: 2000-12
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17. Water-borne cues induce chemical defense in a marine alga (Ascophyllum nodosum)
It is well known that herbivores can induce chemical defenses in terrestrial vascular plants, but few examples of inducible production of defense chemicals have been reported for aquatic macrophytes. Furthermore, it is well established that water-borne chemical cues from predators or predator-wounded conspecifics can induce defensive changes of aquatic
The National Academy of Sciences.
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18. Seaweed resistance to microbial attack: A targeted chemical defense against marine fungi
Pathogenic microbes can devastate populations of marine plants and animals. Yet, many sessile organisms such as seaweeds and sponges suffer remarkably low levels of microbial infection, despite lacking cell-based immune systems. Antimicrobial defenses of marine organisms are largely uncharacterized, although from a small number of studies it appears that
National Academy of Sciences.
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19. An acoustic microscopy technique reveals hidden morphological defenses in Daphnia
Inducible defenses are common strategies for coping with the selective force of predation in heterogeneous environments. In recent years the conspicuous and often dramatic morphological plasticity of several waterflea species of the genus Daphnia have been found to be inducible defenses activated by chemical cues released by predators. However, the exact def
National Academy of Sciences.
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20. Jasmonate-induced responses are costly but benefit plants under attack in native populations
Herbivore attack is widely known to reduce food quality and to increase chemical defenses and other traits responsible for herbivore resistance. Inducible defenses are commonly thought to allow plants to forgo the costs of defense when not needed; however, neither their defensive function (increasing a plant’s fitness) nor their cost-savings function have
The National Academy of Sciences.
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21. Nitrogen Supply Influences Herbivore-Induced Direct and Indirect Defenses and Transcriptional Responses in Nicotiana attenuata[w]
Although nitrogen (N) availability is known to alter constitutive resistance against herbivores, its influence on herbivore-induced responses, including signaling pathways, transcriptional signatures, and the subsequently elicited chemical defenses is poorly understood. We used the native tobacco, Nicotiana attenuata, which germinates in the postfire environ
American Society of Plant Biologists.
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22. Millipede defense: use of detachable bristles to entangle ants.
The millipede Polyxenus fasciculatus (Diplopoda; Polyxenida) defends itself against ants by use of a pair of bristle tufts at its rear. When attacked, it wipes the tufts against the ants, thereby causing these to become encumbered by bristles that detach from the tufts. Ants contaminated with bristles desist from their assault. The bristles have grappling ho
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23. Evolutionary consequences of food chain length in kelp forest communities.
Kelp forests are strongly influenced by macroinvertebrate grazing on fleshy macroalgae. In the North Pacific Ocean, sea otter predation on macroinvertebrates substantially reduces the intensity of herbivory on macroalgae. Temperate Australasia, in contrast, has no known predator of comparable influence. These ecological and biogeographic patterns led us to p
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24. Identification of a Soluble, High-Affinity Salicylic Acid-Binding Protein in Tobacco.
Salicylic acid (SA) is a key component in the signal transduction pathway(s), leading to the activation of certain defense responses in plants after pathogen attack. Previous studies have identified several proteins, including catalase and ascorbate peroxidase, through which the SA signal might act. Here we describe a new SA-binding protein. This soluble pro