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Registros recuperados: 6
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A model of stimulus-specific neural assemblies in the insect antennal lobe Inra
Martinez, D.; Montejo, N..
A fundamental question in computational neuroscience is to understand how interactions between neurons underlie sensory coding and information storage. In the first relay of the insect olfactory system, odorant stimuli trigger synchronized activities in neuron populations. Synchronized assemblies may arise as a consequence of inhibitory coupling, because they are disrupted when inhibition is pharmacologically blocked. Using computational modelling, we studied the role of inhibitory, noisy interactions in producing stimulus-specific synchrony. So far, experimental data and modelling studies indicate that fast inhibition induces neural synchrony, but it remains unclear how desynchronization occurs. From theoretical analysis and computer simulations, we found...
Tipo: Journal Article Palavras-chave: DROSOPHILE; NEURONE; OLFACTION; INSECTE; MODELE; LOBE ANTENNAIRE; ODEUR; STIMULUS; ANALYSE STATISTIQUE OLFACTORY-BULB; INHIBITORY NEURONS; OSCILLATORY SYNCHRONIZATION; ODOR REPRESENTATION; OUTPUT NEURONS; NETWORK MODEL; DROSOPHILA; DYNAMICS; DISCRIMINATION; INFORMATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201028bfe973&uri=/notices/prodinra1/2010/10/
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Behavioral characterization of individual olfactory memory retrieval in Drosophila melanogaster Inra
Chabaud, M.A.; Preat, T.; Kaiser-Arnaud, L..
Memory performance depends not only on effective learning and storage of information, but also on its efficient retrieval. In Drosophila, aversive olfactory conditioning generates qualitatively different forms of memory depending on the number and spacing of conditioning trials. However, it is not known how these differences are reflected at the retrieval level, in the behavior of individual flies during testing. We analyzed conditioned behaviors after one conditioning trial and after massed and spaced repeated trials. The single conditioning produces an early memory that was tested at 1.5 h. Tested at 24 h after training, the spaced and the massed protocols generate two different forms of consolidated memory, dependent, or independent of de novo...
Tipo: Journal Article Palavras-chave: MEMOIRE OLFACTIVE; DROSOPHILE; RECUPERATION DE LA MEMOIRE INSECT; AVERSIVE CONDITIONING; MEMORY RETRIEVAL; BEHAVIOR; ODOR CHOICE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011db0d8a92&uri=/notices/prodinra1/2011/05/
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Characterization of ecdysteroids in Drosophila melanogaster by enzyme immunoassay and nano-liquid chromatography–tandem mass spectrometry Inra
Blais, C.; Blasco, T.; Maria, A.; Dauphin-Villemant, C.; Lafont, R..
Ecdysteroids are polyhyclroxylated steroids that function as molting hormones in insects. 20-Hydroxyecdysone (a 27C-ecdysteroid) is classically considered as the major steroid hormone of Drosophila melanogaster, but this insect also contains 28C-ecdysteroids. This arises from both the use of several dietary sterols as precursors for the synthesis of its steroid hormones, and its inability to dealkylate the 28C-phytosterols to produce cholesterol. The nature of Drosophila ecdysteroids has been re-investigated using both high-performance liquid chromatography coupled to enzyme immunoassay and a particularly sensitive nano-liquid chromatography-mass spectrometry methodology, while taking advantage of recently available ecdysteroid standards isolated from...
Tipo: Journal Article Palavras-chave: DROSOPHILE; ARTHROPODA; HEXAPODA; INSECTE; SPECTROMETRIE DE MASSE; ECDYSTEROIDE; HORMONE; HORMONE DE MUE; ENZYME; CHROMATOGRAPHIE LIQUIDE; HPLC; TECHNIQUE IMMUNOLOGIQUE DROSOPHILA; DEVELOPMENT; ECDYSONE; MASS SPECTROMETRY; PHYTOSTEROL; STEROL.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e5525b42&uri=/notices/prodinra1/2011/02/
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Continued Neurogenesis in Adult Drosophila as a Mechanism for Recruiting Environmental Cue-Dependent Variants Inra
Rokia-Mille, S.B.; Tinette, S.; Engler, G.; Arthaud Hugonin, L.; Tares-Amichot, S.; Robichon, A..
BackgroundThe skills used by winged insects to explore their environment are strongly dependent upon the integration of neurosensory information comprising visual, acoustic and olfactory signals. The neuronal architecture of the wing contains a vast array of different sensors which might convey information to the brain in order to guide the trajectories during flight. In Drosophila, the wing sensory cells are either chemoreceptors or mechanoreceptors and some of these sensors have as yet unknown functions. The axons of these two functionally distinct types of neurons are entangled, generating a single nerve. This simple and accessible coincidental signaling circuitry in Drosophila constitutes an excellent model system to investigate the developmental...
Tipo: Journal Article Palavras-chave: DROSOPHILE; INSECTES AILES; NEURONE; ARCHITECTURE NEURONALE; AILE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201194be1698&uri=/notices/prodinra1/2011/04/
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Introduction history of Drosophila subobscura in the New World: a microsatellite based survey using ABC methods Inra
Pascual, M.; Chapuis, M.P.; Mestres, F.; Balanya, J.; Huey, R.B.; Gilchrist, G.W.; Serra, L.; Estoup, A..
America in the early 1980s, and that rapidly invaded broad latitudinal ranges on both continents. To trace the source and history of this invasion, we obtained genotypic data on nine microsatellite loci from two South American, two North American and five European populations of D. subobscura. We analysed these data with traditional statistics as well as with an approximate Bayesian computation (ABC) framework. ABC methods yielded the strongest support for the scenario involving a serial introduction with founder events from Europe into South America, and then from South America into North America. Stable effective population size of the source population was very large (around one million individuals), and the propagule size was notably smaller for the...
Tipo: Journal Article Palavras-chave: DROSOPHILE; FAUNE PALEARCTIQUE; MICROSATELLITE; METHODE BAYESIENNE APPROXIMATE BAYESIAN COMPUTATION; COLONIZATION; DROSOPHILA SUBOBSCURA; MICROSATELLITE; NUMBER OF FOUNDERS; SEQUENTIAL INVASIONS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008ac55ab91&uri=/notices/prodinra1/2008/05/
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Parametric and genetic analysis of Drosophila appetitive long-term memory and sugar motivation Inra
Colomb, J.; Kaiser, L.; Chabaud, M.-A.; Preat, T..
Distinct forms of memory can be highlighted using different training protocols. In Drosophila olfactory aversive learning, one conditioning session triggers memory formation independently of protein synthesis, while five spaced conditioning sessions lead to the formation of long-term memory (LTM), a long-lasting memory dependent on de novo protein synthesis. In contrast, one session of odour-sugar association appeared sufficient for the fly to form LTM. We designed and tuned an apparatus that facilitates repeated discriminative conditioning by alternate presentations of two odours, one being associated with sugar, as well as a new paradigm to test sugar responsiveness (SR). Our results show that both SR and short-term memory (STM) scores increase with...
Tipo: Journal Article Palavras-chave: PROTEINE; ANALYSE GENETIQUE; DROSOPHILE; INSECTE; OLFACTION; SUCRE; GLUCIDE; CONDITIONNEMENT; APPRENTISSAGE; MEMOIRE; ODEUR APPETITIVE LEARNING; CONDITIONING; CRAMMER; MEMORY DYNAMICS; MOTIVATION; PROTEIN SYNTHESIS; RADISH; STARVATION; SUGAR RESPONSIVENESS; TEQUILA.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010a513bd23&uri=/notices/prodinra1/2010/09/
Registros recuperados: 6
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