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Search Results: 1 - 10 of 1233 matches for " Hervé Colinet "
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Functional Characterization of the Frost Gene in Drosophila melanogaster: Importance for Recovery from Chill Coma
Hervé Colinet,Siu Fai Lee,Ary Hoffmann
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010925
Abstract: Almost all animals, including insects, need to adapt to temperature fluctuations. The molecular basis of thermal adaptation is not well understood, although a number of candidate genes have been proposed. However, a functional link between candidate genes and thermal tolerance has rarely been established. The gene Frost (Fst) was first discovered when Drosophila flies were exposed to cold stress, but the biological function(s) of Fst has so far not been characterized. Because Fst is up-regulated after a cold stress, we tested whether it was essential for chill-coma recovery.
Metabolic and Proteomic Profiling of Diapause in the Aphid Parasitoid Praon volucre
Hervé Colinet, David Renault, Blandine Charoy-Guével, Emmanuelle Com
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0032606
Abstract: Background Diapause, a condition of developmental arrest and metabolic depression exhibited by a wide range of animals is accompanied by complex physiological and biochemical changes that generally enhance environmental stress tolerance and synchronize reproduction. Even though some aspects of diapause have been well characterized, very little is known about the full range of molecular and biochemical modifications underlying diapause in non-model organisms. Methodology/Principal Findings In this study we focused on the parasitic wasp, Praon volucre that exhibits a pupal diapause in response to environmental signals. System-wide metabolic changes occurring during diapause were investigated using GC-MS metabolic fingerprinting. Moreover, proteomic changes were studied in diapausing versus non-diapausing phenotypes using a combination of two-dimensional differential gel electrophoresis (2D-DIGE) and mass spectrometry. We found a reduction of Krebs cycle intermediates which most likely resulted from the metabolic depression. Glycolysis was galvanized, probably to favor polyols biosynthesis. Diapausing parasitoids accumulated high levels of cryoprotective polyols, especially sorbitol. A large set of proteins were modulated during diapause and these were involved in various functions such as remodeling of cytoskeleton and cuticle, stress tolerance, protein turnover, lipid metabolism and various metabolic enzymes. Conclusions/Significance The results presented here provide some first clues about the molecular and biochemical events that characterize the diapause syndrome in aphid parasitoids. These data are useful for probing potential commonality of parasitoids diapause with other taxa and they will help creating a general understanding of diapause underpinnings and a background for future interpretations.
Préface
Colinet, G.
Biotechnologie, Agronomie, Société et Environnement , 2011,
Abstract: Foreword. /.
Molecular gastronomy is a scientific discipline, and note by note cuisine is the next culinary trend
Hervé This
Flavour , 2013, DOI: 10.1186/2044-7248-2-1
Abstract: In 1988, a new scientific discipline, molecular gastronomy, was defined as ‘looking for the mechanisms of phenomena occurring during dish preparation and consumption’ [1,2]. This new definition presented the opportunity to discuss the precise content of molecular gastronomy and its relationship with other existing fields of science.There has always been much confusion between science and technology when it comes to food, including over exactly what food is. Dictionaries give the definition: ‘any substance that can give to living beings the elements necessary for their growth or for their preservation’ [3]. However, one has to recognize that human beings very seldom eat non-transformed tissues or natural products; raw materials are transformed so that chemical and physical changes determine the final composition of all food as well as its ‘bioactivity’, a term which we propose to describe the sensory effects, nutritional value, eventual toxic effects, and so on, of the various compounds released by food systems [4].During food preparation, plant or animal tissues are at least washed and cut, and most food are thermally processed. For example, even for a simple carrot salad, which requires no thermal processing, there is a big difference between the raw product in the field and what is consumed - that is, grated carrots on a plate: this is because cutting the tissue triggers enzymatic reactions [5] and because compounds get transferred between the dressing and the plant tissue [6]. This analysis leads to the conclusion that reagents and products of ‘culinary transformations’ (transformations performed in the kitchen) should not both be called food. The specific transformation occurring from the raw materials to the final prepared dish is worth studying, both for scientific and technological reasons.Making the difference between science and technology clear is particularly important for molecular gastronomy because of the confusion between science and cooking (see, for
Moving contact lines in a pure-vapor atmosphere: a singularity-free description in the sole framework of classical physics
Alexey Rednikov,Pierre Colinet
Physics , 2012, DOI: 10.1103/PhysRevE.87.010401
Abstract: We here show that, even in the absence of "regularizing" microscopic effects (viz. slip at the wall or the disjoining pressure/precursor films), no singularities in fact arise for a moving contact line surrounded by the pure vapor of the liquid considered. There are no evaporation-related singularities either even should the substrate be superheated. We consider, within the lubrication approximation and a classical one-sided model, a contact line advancing/receding at a constant velocity, or immobile, and starting abruptly at a (formally) bare solid surface with a zero or finite contact angle.
Vapour Cloud Dynamics Induced by Evaporation
Sam Dehaeck,Pierre Colinet
Physics , 2010,
Abstract: In this fluid dynamics video, the vapour cloud generated near evaporating free liquid surfaces is visualised by Mach-Zehnder interferometry (MZI). More precisely, for evaporating HFE-7100 (from 3M) and ambient conditions, the vapour concentration field and its dynamical behaviour are observed in three simple experiments. Through these experiments, it is evidenced that the high density of the vapour cloud (compared to air) induces convective motions in the gas mixture, resulting in deviations of the concentration field from a purely diffusional behaviour.
LVDC: An Efficient Energy Solution for On-Grid Photovoltaic Applications  [PDF]
Anis Ammous, Hervé Morel
Smart Grid and Renewable Energy (SGRE) , 2014, DOI: 10.4236/sgre.2014.54007
Abstract:

In this paper some photovoltaic, PV, conversion chains architectures for on-grid applications have been proposed and the advantage of the direct use of a Low Voltage Direct Current (LVDC) bus for the DC loads has been shown. The evaluation of the efficiency of the proposed chains compared to the classical one was performed. It is shown that LVDC use instead of standard AC plugs, in numerous applications, is promising in future. The registered annual saved energy can exceed 25% of the PV generated energy. This important rate, the need of better services at lower economic cost and environmental burden will incite to make reflection about industry and supplies’ future standards.

Why African Companies Are Absent on the Bond Market? An Explanation through Companies Listed on the BRVM  [PDF]
Ndoume Essingone Hervé
Modern Economy (ME) , 2019, DOI: 10.4236/me.2019.101015
Abstract:

This research provides some answers to the question of the limited presence of African companies in the bond markets. Indeed, from a sample of companies listed on the BRVM and panel models tested by the Generalized Moment Method (GMM) developed by Blundell and Bond [1], we study the behavior of the variables usually retained in the work on the determinants of bond issues. We show that the reputation, renegotiability and maturity of the debt, as well as the level of wealth created, determine the debt behavior of companies. Also, any financing strategy by bond issues should take into account these determinants.

Intérêt des cartes des sols pour l'élaboration d'une stratégie d'échantillonnage en sols contaminés par retombées atmosphériques : application à l'étude de l'effet sol sur le devenir des éléments traces métalliques
Liénard, A.,Bock, L.,Colinet, G.
Biotechnologie, Agronomie, Société et Environnement , 2011,
Abstract: Interest of soil maps to elaborate a sampling strategy in soils contaminated by atmospheric fallouts: application to the study of soil effect on the fate of metallic trace elements. As a result of pollution from atmospheric dusts, some sites of Wallonia (Belgium) are contaminated by metallic trace elements (MTE) such as cadmium, lead and zinc. These metalliferous soils are called 'calaminary sites'. The major aim of this study concerns the multi-scalar characterization of MTE distribution in these contaminated soils and landscapes. The strategy of sampling described in this paper is based on the influence of soil type and its land use on the fate of MTE. After analysis of collected samples, it will be possible to have an idea of the distribution of MTE among soil components, and therefore, to evaluate the risks caused by environmental changes such as an agricultural use of afforested areas.
Comparison of capacitive and frequential readout when scaling accelerometers down from Micro- to Nano- Electro Mechanical Systems
Sébastien Hentz,Laurent Duraffourg,Eric Colinet
Physics , 2012,
Abstract: This paper shows the effect of scaling silicon accelerometers down from MEMS to NEMS. It models both electronics and Brownian noise sources for both capacitive and resonant devices, and computes the minimum detectable signal attainable. Computed results are remarkably close to published experimental results. It shows the relatively low influence of the quality factor and of the beam width in the resonant case. Different scaling rules are investigated, and it appears that resonant sensing may satisfy some new application requirements, in particular for critical dimensions below a few hundreds of nm, when it is better resolved than capacitive sensing.
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