Search results for: Sylvain Legay

Items from 1 to 20 out of 27 results

article

On the edge‐biclique graph and the iterated edge‐biclique operator

Leandro Montero, Sylvain Legay

Journal of Graph Theory > 100 > 2 > 232 - 251

A biclique of a graph

G

is a maximal induced complete bipartite subgraph of

G

. The edge‐biclique graph of

G

K B_{e} (G)

, is the edge‐intersection graph of the bicliques of

G

. A graph

G

diverges (resp. converges or is periodic) under an operator

H

whenever

\lim_{k \to \infty} ∣ V (H^{k} (G)) ∣ = \infty

(resp.

\lim_{k \to \infty} H^{k} (G) = H^{m} (G)

for some

m

H^{k} (G) = H^{k + s} (G)

for some

k

and

s \geq 2

). The iterated edge‐biclique graph of

G

K B_{e}^{k} (G)

, is the...

article

Molecular insights into plant desiccation tolerance: transcriptomics, proteomics and targeted metabolite profiling in Craterostigma plantagineum

Xuan Xu, Sylvain Legay, Kjell Sergeant, Simone Zorzan, more

The Plant Journal > 107 > 2 > 377 - 398

The resurrection plant Craterostigma plantagineum possesses an extraordinary capacity to survive long‐term desiccation. To enhance our understanding of this phenomenon, complementary transcriptome, soluble proteome and targeted metabolite profiling was carried out on leaves collected from different stages during a dehydration and rehydration cycle. A total of 7348 contigs, 611 proteins and 39 metabolites...

article

Handling wine pomace: The importance of drying to preserve phenolic profile and antioxidant capacity for product valorization

Joana Corte‐Real, Axel Archaimbault, Thomas Schleeh, Emmanuelle Cocco, more

Journal of Food Science > 86 > 3 > 892 - 900

Four different wine grape pomaces (GP) (Vitis vinifera) varieties, Auxerrois, Pinot Blanc, Gamay and Pinot Noir, and obtained from white, rosé or red wine vinification, were considered for possible valorization in food supplement industry. Stabilization of GP by drying is paramount prior to further processing in the valorization chain, as GP might suffer spoilage over time. The objectives of this...

article

Safe sets, network majority on weighted trees

Ravindra B. Bapat, Shinya Fujita, Sylvain Legay, Yannis Manoussakis, more

Networks > 71 > 1 > 81 - 92

Let

G = (V, E)

be a graph and let

w : V \to ℝ_{> 0}

be a positive weight function on the vertices of G. For every subset X of V, let

w (X) : = \sum_{v \in G} w (v)

. A non‐empty subset

S \subseteq V (G)

is a weighted safe set if, for every component C of the subgraph induced by S and every component D of

G ∖ S

, we have

w (C) \geq w (D)

whenever there is an edge between C and D. If the subgraph

G [S]

induced by a weighted safe set S is connected,...

article

Safe sets in graphs: Graph classes and structural parameters

Raquel Águeda, Nathann Cohen, Shinya Fujita, Sylvain Legay, more

Journal of Combinatorial Optimization > 2018 > 36 > 4 > 1221-1242

A safe set of a graph $$G=(V,E)$$ G=(V,E) is a non-empty subset S of V such that for every component A of G[S] and every component B of $$G[V {\setminus } S]$$ G[V\S] , we have $$|A| \ge |B|$$ |A|≥|B| whenever there exists an edge of G between A and B. In this paper, we show that a minimum safe set can be found in polynomial time for trees. We then further extend the result and present polynomial-time...

article

The complexity of tropical graph homomorphisms

Florent Foucaud, Ararat Harutyunyan, Pavol Hell, Sylvain Legay, more

Discrete Applied Mathematics > 2017 > 229 > C > 64-81

A tropical graph ( H , c ) consists of a graph H and a (not necessarily proper) vertex-colouring c of H . Given two tropical graphs ( G , c 1 ) and ( H , c ) , a homomorphism of ( G , c 1 ) to ( H , c ) is a standard graph homomorphism of G to H that also preserves the vertex-colours. We initiate the study of the computational complexity of tropical graph homomorphism...

article

Identification of fasciclin-like arabinogalactan proteins in textile hemp (Cannabis sativa L.): in silico analyses and gene expression patterns in different tissues

Gea Guerriero, Lauralie Mangeot-Peter, Sylvain Legay, Marc Behr, more

BMC Genomics > 2017 > 18 > 1 > 1-13

Background The fasciclin-like arabinogalactan proteins (FLAs) belong to the arabinogalactan protein (AGP) superfamily and are known to play different physiological roles in plants. This class of proteins was shown to participate in plant growth, development, defense against abiotic stresses and, notably, cell wall biosynthesis. Although some studies are available on the characterization of FLA genes...

article

Endothelial responses of the alveolar barrier in vitro in a dose-controlled exposure to diesel exhaust particulate matter

Sebastian G. Klein, Sébastien Cambier, Jennifer Hennen, Sylvain Legay, more

Particle and Fibre Toxicology > 2017 > 14 > 1 > 1-17

Background During the last 250 years, the level of exposure to combustion-derived particles raised dramatically in western countries, leading to increased particle loads in the ambient air. Among the environmental particles, diesel exhaust particulate matter (DEPM) plays a special role because of its omnipresence and reported effects on human health. During recent years, a possible link between air...

article

MdMyb93 is a regulator of suberin deposition in russeted apple fruit skins

Sylvain Legay, Gea Guerriero, Christelle André, Cédric Guignard, more

New Phytologist > 212 > 4 > 977 - 991

A comparison of the transcriptomes of russeted vs nonrusseted apple skins previously highlighted a tight relationship between a gene encoding an MYB‐type transcription factor, MdMYB93, and some key suberin biosynthetic genes. The present work assesses the role of this transcription factor in the suberization process. A phylogenetic analysis of MdMYB93 and Arabidopsis thaliana MYBs was performed...

article

Network Majority on Tree Topological Network

Ravindra B. Bapat, Shinya Fujita, Sylvain Legay, Yannis Manoussakis, more

Electronic Notes in Discrete Mathematics > 2016 > 54 > C > 79-84

Let G=(V,E) be a graph, and w:V→Q>0 be a positive weight function on the vertices of G. For every subset X of V, let w(X)=∑v∈Gw(v). A non-empty subset S⊂V(G) is a weighted safe set if, for every component C of the subgraph induced by S and every component D of G\S, we have w(C)≥w(D) whenever there is an edge between C and D.In this paper we show that the problem of computing the minimum weight...

article

Multifunctional oxidosqualene cyclases and cytochrome P450 involved in the biosynthesis of apple fruit triterpenic acids

Christelle M. Andre, Sylvain Legay, Amélie Deleruelle, Niels Nieuwenhuizen, more

New Phytologist > 211 > 4 > 1279 - 1294

Apple (Malus × domestica) accumulates bioactive ursane‐, oleanane‐, and lupane‐type triterpenes in its fruit cuticle, but their biosynthetic pathway is still poorly understood. We used a homology‐based approach to identify and functionally characterize two new oxidosqualene cyclases (MdOSC4 and MdOSC5) and one cytochrome P450 (CYP716A175). The gene expression patterns of these enzymes and of previously...

article

Inflammation related responses of intestinal cells to plum and cabbage digesta with differential carotenoid and polyphenol profiles following simulated gastrointestinal digestion

Anouk Kaulmann, Sylvain Legay, Yves‐Jacques Schneider, Lucien Hoffmann, more

Molecular Nutrition & Food Research > 60 > 5 > 992 - 1005

Scope Plums/cabbages represent fruits/vegetables rich in carotenoids and polyphenols, and have been associated with anti‐inflammatory properties. Methods and results We tested four plum (Italian Plum, Plum 620, Ersinger, and Cherry Plum) and cabbage varieties (Duchy, Kalorama, Kale, Scots Kale) with contrasting carotenoid/polyphenol content for their capability to alter inflammation/oxidative stress...

article

No evidence for oxidative stress in the cerebellar tissues or cells of juvenile male mice exposed via lactation to the 6 non-dioxin-like PCBs at levels below the regulatory safe limits for humans

Arpiné Ardzivian Elnar, Frédéric Desor, Sylvain Legay, Christophe Nemos, more

Toxicology Letters > 2016 > 245 > C > 7-14

The developing central nervous system is particularly vulnerable to environmental contaminants such as non-dioxin-like polychlorinated biphenyls (NDL-PCBs). This study investigated the potential oxidative effects in mice pups exposed via lactation to the sum of the six indicator NDL-PCBs (∑6 NDL-PCBs) at 0, 1, 10 and 100ng/kg per 14 days, constituting levels below the guidance values fixed by French...

article

Linear time algorithms for weighted offensive and powerful alliances in trees

Ararat Harutyunyan, Sylvain Legay

Theoretical Computer Science > 2015 > 582 > Complete > 17-26

Given a graph G=(V,E) with a positive weight function w on the vertices of G, a global powerful alliance of G is a subset S of V such that for every vertex v at least half of the total weight in the closed neighborhood of v is contributed by the vertices of S. A global offensive alliance is a subset S of V such that the above condition holds for every vertex v not in S. Finding the smallest such set...

article

Apple russeting as seen through the RNA-seq lens: strong alterations in the exocarp cell wall

Sylvain Legay, Gea Guerriero, Amélie Deleruelle, Marc Lateur, more

Plant Molecular Biology > 2015 > 88 > 1-2 > 21-40

Russeting, a commercially important defect in the exocarp of apple ( Malus × domestica ), is mainly characterized by the accumulation of suberin on the inner part of the cell wall of the outer epidermal cell layers. However, knowledge on the underlying genetic components triggering this trait remains sketchy. Bulk transcriptomic profiling was performed on the exocarps...

article

In vitro models as physiologically relevant tools to investigate pulmonary and intestinal toxicity

Sebastian G. Klein, Anastasia Georgantzopoulou, Tommaso Serchi, Sebastien Cambier, more

Toxicology Letters > 2014 > 229 > Supplement > S191-S192

article

P‐gp efflux pump inhibition potential of common environmental contaminants determined in vitro

Anastasia Georgantzopoulou, Ewa Skoczyńska, Johannes H.J. Van den Berg, Walter Brand, more

Environmental Toxicology and Chemistry > 33 > 4 > 804 - 813

Across different species, cellular efflux pumps such as P‐glycoprotein (P‐gp; also termed multidrug resistance protein 1 [MDR1]) serve as a first line of defense by transporting toxic xenobiotics out of the cell. This mechanism is also active in aquatic organisms such as mussels, fish, and their larvae. Modulation of this resistance mechanism by chemical agents occurring in the environment could result...

article

The Potato in the Human Diet: a Complex Matrix with Potential Health Benefits

Christelle M. Andre, Sylvain Legay, Christian Iammarino, Johanna Ziebel, more

Potato Research > 2014 > 57 > 3-4 > 201-214

Beyond providing energy through its high starch content, the potato tuber can make a significant contribution to the dietary intake of certain minerals including potassium, phosphorous, magnesium and iron, as well as of vitamin C, dietary fibres and phenolic compounds. While some animal and human studies have shown beneficial associations between the consumption of potato, or some of its components,...

article

Disrupting the cinnamyl alcohol dehydrogenase 1 gene (BdCAD1) leads to altered lignification and improved saccharification in Brachypodium distachyon

Madeleine Bouvier d'Yvoire, Oumaya Bouchabke‐Coussa, Wannes Voorend, Sébastien Antelme, more

The Plant Journal > 73 > 3 > 496 - 508

Brachypodium distachyon (Brachypodium) has been proposed as a model for grasses, but there is limited knowledge regarding its lignins and no data on lignin‐related mutants. The cinnamyl alcohol dehydrogenase (CAD) genes involved in lignification are promising targets to improve the cellulose‐to‐ethanol conversion process. Down‐regulation of CAD often induces a reddish coloration of lignified tissues...

article

Iron uptake and homeostasis related genes in potato cultivated in vitro under iron deficiency and overload

Sylvain Legay, Cédric Guignard, Johanna Ziebel, Danièle Evers

Plant Physiology and Biochemistry > 2012 > 60 > Complete > 180-189

Potato is one of the most important staple food in the world because it is a good source of vitamin C, vitamin B6 but also an interesting source of minerals including mainly potassium, but also magnesium, phosphorus, manganese, zinc and iron to a lesser extent. The lack of iron constitutes the main form of micronutrient deficiency in the world, namely iron deficiency anemia, which strongly affects...

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INFONA - science communication portal

Search results for: Sylvain Legay

On the edge‐biclique graph and the iterated edge‐biclique operator

Molecular insights into plant desiccation tolerance: transcriptomics, proteomics and targeted metabolite profiling in Craterostigma plantagineum

Handling wine pomace: The importance of drying to preserve phenolic profile and antioxidant capacity for product valorization

Safe sets, network majority on weighted trees

Safe sets in graphs: Graph classes and structural parameters

The complexity of tropical graph homomorphisms

Identification of fasciclin-like arabinogalactan proteins in textile hemp (Cannabis sativa L.): in silico analyses and gene expression patterns in different tissues

Endothelial responses of the alveolar barrier in vitro in a dose-controlled exposure to diesel exhaust particulate matter

MdMyb93 is a regulator of suberin deposition in russeted apple fruit skins

Network Majority on Tree Topological Network

Multifunctional oxidosqualene cyclases and cytochrome P450 involved in the biosynthesis of apple fruit triterpenic acids

Inflammation related responses of intestinal cells to plum and cabbage digesta with differential carotenoid and polyphenol profiles following simulated gastrointestinal digestion

No evidence for oxidative stress in the cerebellar tissues or cells of juvenile male mice exposed via lactation to the 6 non-dioxin-like PCBs at levels below the regulatory safe limits for humans

Linear time algorithms for weighted offensive and powerful alliances in trees

Apple russeting as seen through the RNA-seq lens: strong alterations in the exocarp cell wall

In vitro models as physiologically relevant tools to investigate pulmonary and intestinal toxicity

P‐gp efflux pump inhibition potential of common environmental contaminants determined in vitro

The Potato in the Human Diet: a Complex Matrix with Potential Health Benefits

Disrupting the cinnamyl alcohol dehydrogenase 1 gene (BdCAD1) leads to altered lignification and improved saccharification in Brachypodium distachyon

Iron uptake and homeostasis related genes in potato cultivated in vitro under iron deficiency and overload

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