Cohomology of Line Bundles on the Flag Variety for Type G_2

In the case of an almost simple algebraic group $G$ of type $G_2$ over a field of characteristic $p>0$ we study the cohomology modules of line bundles on the flag variety for $G$. Our main result is a complete determination of the vanishing behavior of such cohomology in the case where the line bundles in question are induced by characters from the lowest $p^2$-alcoves. When $U_q$ is the quantum group corresponding to $G$ whose parameter $q$ is a complex root of unity of order prime to 6 we give a complete (i.e. covering all characters) description of the vanishing behavior for the corresponding quantized cohomology modules

Dynamic changes in ANGUSTIFOLIA3 complex composition reveal a growth regulatory mechanism in the maize leaf

Most molecular processes during plant development occur with a particular spatio-temporal specificity. Thus far, it has remained technically challenging to capture dynamic protein-protein interactions within a growing organ, where the interplay between cell division and cell expansion is instrumental. Here, we combined high-resolution sampling of the growing maize (Zea mays) leaf with tandem affinity purification followed by mass spectrometry. Our results indicate that the growth-regulating SWI/SNF chromatin remodeling complex associated with ANGUSTIFOLIA3 (AN3) was conserved within growing organs and between dicots and monocots. Moreover, we were able to demonstrate the dynamics of the AN3-interacting proteins within the growing leaf, since copurified GROWTH-REGULATING FACTORs (GRFs) varied throughout the growing leaf. Indeed, GRF1, GRF6, GRF7, GRF12, GRF15, and GRF17 were significantly enriched in the division zone of the growing leaf, while GRF4 and GRF10 levels were comparable between division zone and expansion zone in the growing leaf. These dynamics were also reflected at the mRNA and protein levels, indicating tight developmental regulation of the AN3-associated chromatin remodeling complex. In addition, the phenotypes of maize plants overexpressing miRNA396a-resistant GRF1 support a model proposing that distinct associations of the chromatin remodeling complex with specific GRFs tightly regulate the transition between cell division and cell expansion. Together, our data demonstrate that advancing from static to dynamic protein-protein interaction analysis in a growing organ adds insights in how developmental switches are regulated

Using facets to improve tag-based bookmarking

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Cataloged from PDF version of thesis.Includes bibliographical references (p. 51-52).Facette is a web service that uses facets to enhance the organizational capabilities of tag-based bookmarking systems. As with other bookmarking services, Facette allows users to associate tags with bookmarks to assist the retrieval of information. Facette also allows users to classify tags through use of facets. To create these facets, Facette introduces a method of facet creation called free faceted tagging. To assist the classification of tags using facets, Facette extends the concept of collaborative tagging and introduces the concept of collaborative faceting. For ease of implementation, Facette is implemented as an augmentation of Delicious' tagging system. Faceted information is saved to Delicious through use of new tag syntax. Faceted information is retrieved from Delicious through use of Delicious's API. Since its public debut on February 16th, 2009, Facette has successfully assisted the use of faceted tagging. Facette has been used by several hundred Delicious users. Facette's tagging interface has led to the bookmarking of thousands of pages with thousands of faceted tags. Overall, Facette has successfully encouraged the creation of faceted information.by Peter Lai.M.Eng

Langual : un langage international pour la description structurée des aliments = Langual : an international language for the structured description of foods

L'article traite de l'organisation des nouvelles banques de données sur la composition des aliments en s'appuyant sur l'exemple de la banque française REGAL développée au CIQUAL. La codification des nutriments et les principes de standardisation des formules de calcul de certains nutriments sont évoqués. L'identification précise des aliments grâce à une description claire, complète, scientifique et se prêtant à des vérifications automatisées de similitude, est indispensable pour assurer de façon cohérente des transferts de données entre banques de différents pays. Langual, système international de codification descriptive des aliments permet une telle identification. Chaque aliment à coder est décrit par un ensemble des descripteurs standardisés, eux-mêmes regroupés en facettes. Chaque facette représente un sous-ensemble de caractéristiques comme l'origine biologique, les traitements technologiques, les méthodes de conservation et de cuisson, qui spécifient la qualité nutritionnelle et/ou hygiénique d'un aliment. (Résumé d'auteur

Compactifications polygonales d'un immeuble affine

We define a compactification of an affine building \I indexed by a family of partitions of the director space $\vec A$ of one of its appartments $A$. This compactification is similar to Satake's compatification of a symetric space, and it generalizes the quite well known polygonal compactification of an affine building in the sense that it is independant of the action of a group on the building, and that it allows some variations depending on the choice of the partition of $\vec A$. The different choices will mainly lead to different subgroups of the Weyl group acting on the border of $A$. Along the proofs, we get some results to help one find subsets of the building wich are included in an apartment, for exemple we prove that two sector facets can always be reduced so that they fit in one apartment

OpenCCM : une infrastructure à composants pour le déploiement d'applications à base de composants CORBA

Le déploiement de composants logiciels pour la construction d'applications réparties consiste à coordonner un ensemble de tâches élémentaires comme le téléchargement des binaires sur les sites d'exécution, leur chargement en mémoire, la création d'instances de composants, l'interconnexion de leurs ports, la configuration de leurs propriétés métiers et techniques. Automatiser le processus de déploiement nécessite alors la présence d'une infrastructure logicielle elle-même répartie sur les différents sites d'exécution. Cet article présente les caractéristiques d'une telle infrastructure pour le déploiement d'applications à base de composants CORBA. Cette dernière a été conçue et réalisée dans le cadre de notre plate-forme OpenCCM, une implantation libre du modèle de composants CORBA. La principale caractéristique de cette infrastructure est qu'elle est elle-même conçue sous la forme d'assemblages de composants CORBA. Ceci autorise son assemblage dynamique lors de son déploiement sur les sites d'exécution.––––– Deployment of software components for building distributed applications consists of the coordination of a set of basic tasks like uploading component binaries to the execution sites, loading them in memory, instantiating components, interconnecting their ports, setting their business and technical attributes. The automation of the deployment process then requires the presence of a software infrastructure distributed itself on the different execution sites. This paper presents the characteristics of such an infrastructure for the deployment of CORBA component-based applications. This latter is designed and implemented in the context of our OpenCCM platform, an open source implementation of the CORBA Component Model. The main characteristic lays on the fact that this infrastructure is itself designed as a set of CORBA component assemblies. This allows its dynamic assembly during its deployment over the execution site