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Search Results: 1 - 10 of 2763 matches for " Julien Debreuil "
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Fast Growth May Impair Regeneration Capacity in the Branching Coral Acropora muricata
Vianney Denis, Mireille M. M. Guillaume, Madeleine Goutx, Stéphane de Palmas, Julien Debreuil, Andrew C. Baker, Roxane K. Boonstra, J. Henrich Bruggemann
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0072618
Abstract: Regeneration of artificially induced lesions was monitored in nubbins of the branching coral Acropora muricata at two reef-flat sites representing contrasting environments at Réunion Island (21°07′S, 55°32′E). Growth of these injured nubbins was examined in parallel, and compared to controls. Biochemical compositions of the holobiont and the zooxanthellae density were determined at the onset of the experiment, and the photosynthetic efficiency (Fv/Fm) of zooxanthellae was monitored during the experiment. Acropora muricata rapidly regenerated small lesions, but regeneration rates significantly differed between sites. At the sheltered site characterized by high temperatures, temperature variations, and irradiance levels, regeneration took 192 days on average. At the exposed site, characterized by steadier temperatures and lower irradiation, nubbins demonstrated fast lesion repair (81 days), slower growth, lower zooxanthellae density, chlorophyll a concentration and lipid content than at the former site. A trade-off between growth and regeneration rates was evident here. High growth rates seem to impair regeneration capacity. We show that environmental conditions conducive to high zooxanthellae densities in corals are related to fast skeletal growth but also to reduced lesion regeneration rates. We hypothesize that a lowered regenerative capacity may be related to limited availability of energetic and cellular resources, consequences of coral holobionts operating at high levels of photosynthesis and associated growth.
Stackelberg-Walras and Cournot-Walras Equilibria in Mixed Markets: A Comparison  [PDF]
Ludovic A. Julien
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.21013
Abstract: In this note, we compare two strategic general equilibrium concepts: the Stackelberg-Walras equilibrium and the Cournot-Walras equilibrium. We thus consider a market exchange economy embodying atoms and a continuum of traders. It is shown that, when the preferences of the small traders are represented by Cobb-Douglas utility functions, the Stackel-berg-Walras and the Cournot-Walras equilibria can coincide only if 1) the endowments and preferences of atoms are identical and 2) the elasticity of the followers’ best response functions are equal to zero in equilibrium.
Stackelberg-Cournot and Cournot Equilibria in a Mixed Markets Exchange Economy  [PDF]
Ludovic A. Julien
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.23056
Abstract: In this note, we compare two strategic general equilibrium concepts: the Stackelberg-Cournot equilibrium and the Cournot equilibrium. We thus consider a market exchange economy including atoms and a continuum of traders, who behave strategically. We show that, when the preferences of the small traders are represented by Cobb-Douglas utility functions and the atoms have the same utility functions and endowments, the Stackelberg-Cournot and the Cournot equilibrium equilibria coincide if and only if the followers’ best responses functions have a zero slope at the SCE.
A Hybrid Technique for the Periodicity Characterization of Genomic Sequence Data
Julien Epps
EURASIP Journal on Bioinformatics and Systems Biology , 2009, DOI: 10.1155/2009/924601
Abstract: The detection of structure within the DNA sequence has long captivated the interest of the research community. Among the various statistical characterizations of sequence data, one measure of structure within sequences is the degree of correlation or periodicity at various displacements along the sequence. Periodicity characterization of sequence data provides a compact and informative representation that has been used in many studies of structure within genomic sequences, including DNA sequence analysis [1], gene and exon detection [2], tandem repeat detection [3], and DNA sequence search and retrieval [4].To measure such periodicity, autocorrelation has been widely employed [1, 5–11]. Similarly, Fourier analysis and its variants have been used for periodicity characterization of sequences [4, 9, 12–24]. In some cases [25, 26], the Fourier transform of the autocorrelation sequence has also been computed, however using existing symbolic-numeric mappings such as binary indicator sequences [27], this transform can also be calculated without first determining the autocorrelation. Other recent promising approaches to periodicity characterization for biological sequences include the periodicity transform [28], the exactly periodic subspace decomposition [3], and maximum-likelihood statistical periodicity [29], however these techniques have yet to be adopted by biologists for the purposes of sequence structure characterization.Studies of structure within sequences, such as those referenced above, have tended to use either the autocorrelation or the Fourier transform, and to the author's knowledge, the limitations of each have not been compared in this context. In this paper, the limitations of both approaches are investigated using synthetic symbolic sequences, and caveats to their characterization of sequence data are discussed. A hybrid approach to periodicity characterization of symbolic sequence data is introduced, and its use is illustrated in a comparative manner on
Barthes, leitor de Malraux: uma oculta??o terrorista
Dieudonné, Julien;
Alea : Estudos Neolatinos , 2003, DOI: 10.1590/S1517-106X2003000200005
Abstract: this article treats the current dislike in france for malraux, author of the novel man's fate, by discussing the almost complete absence of reference to his works by roland barthes. malraux is considered to have abandoned his leftist revolutionary stance after accepting political office next to minister de gaulle. barthes almost never mentions malraux or does it in order to discredit the writer and the minister he works for. this article tries, through fine irony, to offer an alternative to barthes' view and attempts to recover malraux's place in the panorama of french literature from the 1930's.
Bioacoustics of human whistled languages: an alternative approach to the cognitive processes of language
Meyer, Julien;
Anais da Academia Brasileira de Ciências , 2004, DOI: 10.1590/S0001-37652004000200033
Abstract: whistled languages are a valuable heritage of human culture. this paper gives a first survey about a new multidisciplinary approach to these languages. previous studies on whistled equivalents of languages have already documented that they can provide significant information about the role of rhythm and melody in language. to substantiate this, most whistles are represented by modulations of frequency, centered around 2000 hz (±1000 hz) and often reach a loudness of about 130 db (measured at 1m from the source). their transmission range can reach up to 10 km (as verified in la gomera, canary island), and the messages can remain understandable, even if the signal is deteriorated. in some cultures the use of whistled language is associated with some "talking musical instruments" (e.g. flutes, guitars, harps, gongs, drums, khens). finally, whistles as a means of conveying information have some analogues in the animal kingdom (e.g. some birds, cetaceans, primates), providing opportunities to compare the acoustic characteristics of the respective signals. with such properties as a reference, the project reported here has two major tasks: to further elucidate the many facets of whistled language and, above all, help to immediately stop the process of its gradual disappearance.
Planificación, gobernanza y vivienda en la Caracas democrática: Contextualizar para comparar
Cuadernos del Cendes , 2010,
Abstract: like in most of latin-american countries, urban participation is strengthening since the last quarter of the 20th century, acknowledging the emergence of new local voices on the urban stage. with chavez governments and the politicization of social issues in a deeply unequal urban order, participative experiences are even more polemical in caracas. it is crucial to situate urban governance so that socio-spatial interactions and the production of the city can be critically assessed. a method for comparing actor?s logics related with urban planning and housing issues is offered regarding caracas since 1958. it allows identifying main tendencies in the production of the city, managing a comparative approach over time and space, and embodying and politicizing current and improperly isolated experiences.
Qual sociologia para o estudo dos partidos políticos conservadores?
Fretel, Julien;
Revista Brasileira de Ciência Política , 2011, DOI: 10.1590/S0103-33522011000100012
Abstract: the studies of party politics in europe, and particularly in france, have fallen into a certain analytic routine. one of the reasons for this is the neglect in studying organizations that do not fit in the typical models privileged by traditional approaches. also important in this sense is the tendency in fashion towards outlining, amongst other things, the notion of cartelization, or the political combinations or coalitions between parties. submitting these models to verification in base of empirical observation of the "atypical" party organizations, as well as working with the notion of institution in order to think party formations as living organisms, are, for instance, the ways through which one could take political parties not for what they should be, or are not, or even no longer are, but exactly for what they are.
A fábrica da inseguran?a entre lenda urbana e gest?o (Caracas)
Rebotier, Julien;
Tempo Social , 2010, DOI: 10.1590/S0103-20702010000200008
Abstract: caracas figures among the most dangerous cities in the world. moving beyond the venezuelan case, though, this article argues that the regional (latin american) discourse and even global discourses on insecurity need to be territorialized. the social, cultural and political contingencies in venezuela over the last few decades, the actions of the chavist governments and the sociospatial inequalities of the conflict-ridden caracas society presides over a unique construction of urban insecurity as a metanarrative. this article emphasizes the performative dimension of the narrative of insecurity, a genuine urban legend in caracas, and the emergence of innovative forms of local security governance - spaces of regulation that throw into question the roles and statuses previously assumed by the urban actors.
Nonperturbative enhancement of nonGaussian correlators in de Sitter space
Serreau, Julien
High Energy Physics - Phenomenology , 2013,
Abstract: We compute the four-point correlation function of a light O(N) scalar field in de Sitter space in the large-N limit. For superhorizon momentum modes, infrared effects strongly enhance the size of loop contributions. We find that in the deep infrared limit, the latter are of the same order as the tree-level one. The resulting nonGaussian correlator presents a singular momentum dependence.
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