Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 4650 matches for " Sylvia Anton "
All listed articles are free for downloading (OA Articles)
Page 1 /4650
Display every page Item
A first glance on the molecular mechanisms of pheromone-plant odor interactions in moth antennae
Sylvia Anton,Michel Renou
Frontiers in Cellular Neuroscience , 2012, DOI: 10.3389/fncel.2012.00046
Mechanism of the Biphasic Pattern of Neurons Time Coding to Sex Pheromone in the Antennal Lobe of the Male Moth Agrotis segetum
Agrotis segetum雄蛾触角叶神经元对性信息素时间编码的机制分析

Xiang Hui,Sylvia ANTON,Bill S HANSSON,

动物学研究 , 2002,
Abstract: Here studied the mechanism of responded pattern of 33 neurons to sex pheromone in the antennal lobe (AL) of male moths Agrotis segetum . Pressure injecting 100 mmol/L GABA into AL, GABA can elicit inhibitory responses of slow hyperpolarization and long time inhibition of background spiking, alike which caused by sex pheromone in the same neuron. But GABA can not act on the excitation evoked by pheromone. Low Cl - saline caused that the IPSP to reverse the hyperpolarization, excitation evoked by pheromone was prolonged, and the distinct separation between bursts disappeared. Bicuculline was as a GABA A receptor antagonist in vertebrates, and a water soluble form of this agent was used for pressure ejection into the AL neuropil. Bicuculline increased the spike frequency in tested neurons, even strengthened the excitation phase acted by pheromone, and the hyperpolarization and spike inhibition produced by pheromone was replaced by excitation. The effect was reversible by washing in normal saline. Results indicate that the hyperpolarization is related to GABA receptor, which responds to the sex pheromone in AL neurons in the male moths Agrotis segetum .
Frontiers in Invertebrate Physiology – Grand Challenge
Sylvia Anton,Christophe Gadenne,Frédéric Marion-Poll
Frontiers in Physiology , 2011, DOI: 10.3389/fphys.2011.00038
The Role of Interactive Visual Art Learning in Development of Young Children’s Creativity  [PDF]
Sylvia Stavridi
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.621235
Abstract: Learning by interactive arts methods is a non-traditional approach to new creative teaching methods, in which young children are simultaneously engaged to feel and understand the original concept of core content areas in education, such as science, technology and math from a broad perspective. This article is an attempt to investigate the question of “how to keep young children’s creativity alive”. It focuses on the visual art and its interrelation between interactivity and creativity, and how the exploration of arts shapes new ways for our children to improve their practice and interaction in an increasingly intelligent setting. The article explores different digital platforms, tools, art-tech/software, and web-based applications that support the benefits of innovative active learning, and which differentiate teaching methods in traditional classes. The author confers that recently, integrated digital aesthetic learning has shifted the focus from not only fulfilling the existing education system, but also developing new interactive environmentally-friendly education, where educators are encouraged to design and build a creative digital curriculum to engage their students in a constructive way, both formally and informally. Furthermore, it discusses how arts and humanities-based initiatives are taking a prominent place in our integrated learning systems in private elementary schools in Alexandria. The paper then concludes with an emphasis on the crucial and efficient use of digital technologies through primary education as a tool to create and conduct art activities in order to help improve children learning in a creative process.
Electrophysiological Characteristics of Neurons Responding to Sex Pheromone in the Antennal Lobe of the Male Moth Agrotis segetum
Agrotis segetum雄蛾触角叶性信息素反应神经元对电刺激触角神经的反应

XIANG Hui,LUO Jian-wen,Sylvia ANTON,Bill SHANSSON,

动物学研究 , 2001,
Abstract: 为探讨电刺激Agrotis segetum雄蛾触角神经是否可以作为MGC中神经元的识别手段,采用细胞内电生理记录方法,共记录34个对性信息素有反应的MGC神经元,并测试了其中12个神经元对性信息素刺激的反应,22个神经元对性信息素刺激和电刺激的反应。结果表明,MGC神经元对性信息素及电刺激的反应模式基本一致,为一种双相反应模式。两种刺激方式均能诱导出兴奋反应,电刺激得到的兴奋反应比由信息素刺激引起的要短;MGC神经元对两种刺激的超极化反应(抑制反应)幅度影响没有显著性差别,在电刺激实验的22个神经元上,超极化反应幅度和抑制时间都与神经元本身放电频率有一定的相关性。超极化反应是在LN参与下一定的神经回路对刺激所产生的反应而形成的。这提示两种刺激所作用的神经回路应是一致的,但从整个实验过程记录到的神经元情况来看,还须进一步结合形态学实验来验证电刺激触角神经作为MGC神经元的识别手段。
Impact of remote ischemic preconditioning on wound healing in small bowel anastomoses
Philipp Anton Holzner, Birte Kulemann, Simon Kuesters, Sylvia Timme, Jens Hoeppner, Ulrich Theodor Hopt, Goran Marjanovic
World Journal of Gastroenterology , 2011,
Abstract: AIM: To investigate the influence of remote ischemic preconditioning (RIPC) on anastomotic integrity.METHODS: Sixty male Wistar rats were randomized to six groups. The control group (n = 10) had an end-to-end ileal anastomosis without RIPC. The preconditioned groups (n = 34) varied in time of ischemia and time of reperfusion. One group received the amino acid L-arginine before constructing the anastomosis (n = 9). On postoperative day 4, the rats were re-laparotomized, and bursting pressure, hydroxyproline concentration, intra-abdominal adhesions, and a histological score concerning the mucosal ischemic injury were collected. The data are given as median (range).RESULTS: On postoperative day 4, median bursting pressure was 124 mmHg (60-146 mmHg) in the control group. The experimental groups did not show a statistically significant difference (P > 0.05). Regarding the hydroxyproline concentration, we did not find any significant variation in the experimental groups. We detected significantly less mucosal injury in the RIPC groups. Furthermore, we assessed more extensive intra-abdominal adhesions in the preconditioned groups than in the control group.CONCLUSION: RIPC directly before performing small bowel anastomosis does not affect anastomotic stability in the early period, as seen in ischemic preconditioning.
Machine Learning for Automatic Prediction of the Quality of Electrophysiological Recordings
Thomas Nowotny, Jean-Pierre Rospars, Dominique Martinez, Shereen Elbanna, Sylvia Anton
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080838
Abstract: The quality of electrophysiological recordings varies a lot due to technical and biological variability and neuroscientists inevitably have to select “good” recordings for further analyses. This procedure is time-consuming and prone to selection biases. Here, we investigate replacing human decisions by a machine learning approach. We define 16 features, such as spike height and width, select the most informative ones using a wrapper method and train a classifier to reproduce the judgement of one of our expert electrophysiologists. Generalisation performance is then assessed on unseen data, classified by the same or by another expert. We observe that the learning machine can be equally, if not more, consistent in its judgements as individual experts amongst each other. Best performance is achieved for a limited number of informative features; the optimal feature set being different from one data set to another. With 80–90% of correct judgements, the performance of the system is very promising within the data sets of each expert but judgments are less reliable when it is used across sets of recordings from different experts. We conclude that the proposed approach is relevant to the selection of electrophysiological recordings, provided parameters are adjusted to different types of experiments and to individual experimenters.
Involvement of the G-Protein-Coupled Dopamine/Ecdysteroid Receptor DopEcR in the Behavioral Response to Sex Pheromone in an Insect
Antoine Abrieux, Stéphane Debernard, Annick Maria, Cyril Gaertner, Sylvia Anton, Christophe Gadenne, Line Duportets
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0072785
Abstract: Most animals including insects rely on olfaction to find their mating partners. In moths, males are attracted by female-produced sex pheromones inducing stereotyped sexual behavior. The behaviorally relevant olfactory information is processed in the primary olfactory centre, the antennal lobe (AL). Evidence is now accumulating that modulation of sex-linked behavioral output occurs through neuronal plasticity via the action of hormones and/or catecholamines. A G-protein-coupled receptor (GPCR) binding to 20-hydroxyecdysone, the main insect steroid hormone, and dopamine, has been identified in Drosophila (DmDopEcR), and was suggested to modulate neuronal signaling. In the male moth Agrotis ipsilon, the behavioral and central nervous responses to pheromone are age-dependent. To further unveil the mechanisms of this olfactory plasticity, we searched for DopEcR and tested its potential role in the behavioral response to sex pheromone in A. ipsilon males. Our results show that A. ipsilon DopEcR (named AipsDopEcR) is predominantly expressed in the nervous system. The corresponding protein was detected immunohistochemically in the ALs and higher brain centers including the mushroom bodies. Moreover, AipsDopEcR expression increased with age. Using a strategy of RNA interference, we also show that silencing of AipsDopEcR inhibited the behavioral response to sex pheromone in wind tunnel experiments. Altogether our results indicate that this GPCR is involved in the expression of sexual behavior in the male moth, probably by modulating the central nervous processing of sex pheromone through the action of one or both of its ligands.
Multiphasic On/Off Pheromone Signalling in Moths as Neural Correlates of a Search Strategy
Dominique Martinez, Antoine Chaffiol, Nicole Voges, Yuqiao Gu, Sylvia Anton, Jean-Pierre Rospars, Philippe Lucas
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0061220
Abstract: Insects and robots searching for odour sources in turbulent plumes face the same problem: the random nature of mixing causes fluctuations and intermittency in perception. Pheromone-tracking male moths appear to deal with discontinuous flows of information by surging upwind, upon sensing a pheromone patch, and casting crosswind, upon losing the plume. Using a combination of neurophysiological recordings, computational modelling and experiments with a cyborg, we propose a neuronal mechanism that promotes a behavioural switch between surge and casting. We show how multiphasic On/Off pheromone-sensitive neurons may guide action selection based on signalling presence or loss of the pheromone. A Hodgkin-Huxley-type neuron model with a small-conductance calcium-activated potassium (SK) channel reproduces physiological On/Off responses. Using this model as a command neuron and the antennae of tethered moths as pheromone sensors, we demonstrate the efficiency of multiphasic patterning in driving a robotic searcher toward the source. Taken together, our results suggest that multiphasic On/Off responses may mediate olfactory navigation and that SK channels may account for these responses.
A Novel Gene Family Controls Species-Specific Morphological Traits in Hydra
Konstantin Khalturin,Friederike Anton-Erxleben,Sylvia Sassmann,J?rg Wittlieb,Georg Hemmrich,Thomas C. G. Bosch
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0060278
Abstract: Understanding the molecular events that underlie the evolution of morphological diversity is a major challenge in biology. Here, to identify genes whose expression correlates with species-specific morphologies, we compared transcriptomes of two closely related Hydra species. We find that species-specific differences in tentacle formation correlate with expression of a taxonomically restricted gene encoding a small secreted protein. We show that gain of function induces changes in morphology that mirror the phenotypic differences observed between species. These results suggest that “novel” genes may be involved in the generation of species-specific morphological traits.
Page 1 /4650
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.