Search results for "interaction [pi pi]"

La membrane plasmique des plantes : une clé dans la détection des agresseurs et le processus de défensefra

2014

SPE IPM; Le développement d’une méthode d’imagerie innovante a permis de montrer que la membrane plasmique des cellules végétales est une mosaïque de territoires présentant des propriétés biophysiques variées. Cette organisation est modifiée de façon très rapide en réponse à certaines molécules provenant de microorganismes, établissant un lien fonctionnel entre cette organisation et la mise en place des mécanismes de défense.

Etapes précoces des candidoses systémiques : Etude du rôle des cellules M au cours de l'interaction de Candida albicans avec la muqueuse digestive

2015

Sélection artificielle de microbiote rhizosphériques associés à des changements phénotypiques de traits de plante

2019

International audience; La sélection artificielle appliquée au niveau des communautés est un sujet grandissant à l’interface de l’écologie et de l’évolution. Son implémentation relativement récente à l’écologie microbienne s’avère prometteuse non seulement en termes de connaissance fondamentale sur le principe de sélection en luimême, mais aussi en termes de potentiel d’application, notamment en bioremédiation et en agroécologie.Nous avons utilisé l’évolution expérimentale afin de sélectionner artificiellement des communautés microbiennes rhyzosphériques induisant des changements phénotypiques chez leurs hôtes. Durant dix générations consécutives, nous avons fait pousser plusieurs lignées d…

Characterisation of NO synthases from the alga Klebsormidium nitens

2022

Nitric oxide (NO) is an important cellular signaling molecule regulating various physiological processes, in both animals and plants. In animals, NO synthesis is mainly catalyzed by NO synthase (NOS) enzymes. In plants, NOS-like activities sensitive to mammalian NOS inhibitors have been measured, although no sequences encoding mammalian NOS have been found in land plants. Interestingly, we identified NOS-like sequences in about twenty algae species. These latter include the filamentous Charophyta green algae Klebsormidium nitens, a biological model to study the early transition step from aquatic algae to land plants. Currently, two NOS were identified in K. nitens genome: i) KnNOS1 which po…

A Hybrid Virtual-Augmented Serious Game to Improve Driving Safety Awareness

2018

The use of 3D virtual content and Augmented Reality (AR) in certain applications allows designing tools and serious games that are more attractive to the potential users. Focusing on the area of learning and education, these technologies can be adapted to the requirements of the application that needs to be developed, to the available devices on which they are expected to run and also to the learning content. However, in most applications only a single interaction paradigm and a single visualization mode is used, restricting the potential benefits of the system. In this paper, we propose a software application designed to improve driving safety awareness and learning for both adults and chi…

Advanced descriptors for long-range noncovalent interactions between SARS-CoV-2 spikes and polymer surfaces.

2021

The recent pandemic triggered numerous societal efforts aimed to control and limit the spread of SARS-CoV-2. One of these aspects is related on how the virion interacts with inanimate surfaces, which might be the source of secondary infection. Although recent works address the adsorption of the spike protein on surfaces, there is no information concerning the long-range interactions between spike and surfaces, experimented by the virion when is dispersed in the droplet before its possible adsorption. Some descriptors, namely the interaction potentials per single protein and global potentials, were calculated in this work. These descriptors, evaluated for the closed and open states of the sp…

Multimodale Analyse von Interaktion im fremdsprachlichen Klassenzimmer

2016

The article offers a contribution to the interaction research in the foreign language teaching and learning. It starts with an overview of various research approaches to the foreign language teaching and learning, from the 60s to the present days. A multimodal analysis of an excerpt of videorecorded classroom interaction is then provided. The analysis is focused on several aspects of classroom participation and teaching sequences. Some implications of the present research for teachers' training are finally provided.

Teacher smiles as an interactional and pedagogical resource in the classroom

2020

In classroom settings, laughter and smiles are resources for action that are available to both teachers and students. Recent interactional studies have documented how students use these resources to deal with trouble of various kind, but less is known about the sequential and activity contexts of teachers’ laughter-relevant practices, as well as their pedagogical functions. We use multimodal conversation analysis (CA) to investigate the interactional unfolding and pedagogical orientations of teacher smiles during instructional IRE (initiation-response-evaluation) sequences in a corpus of 37 bilingual lessons collected in schools in Finland and Spain. In analysing the focal smiles, we pay at…

Decentralized classification in societies of autonomous and heterogenous robots

2011

This paper addresses the classification problem for a set of autonomous robots that interact with each other. The objective is to classify agents that “behave” in “different way”, due to their own physical dynamics or to the interaction protocol they are obeying to, as belonging to different “species”. This paper describes a technique that allows a decentralized classification system to be built in a systematic way, once the hybrid models describing the behavior of the different species are given. This technique is based on a decentralized identification mechanism, by which every agent classifies its neighbors using only local information. By endowing every agent with such a local classifie…

RPB1 as a marker gene to analyze communities of arbuscular mycorrhizal fungi (Glomeromycota)

2014

The influence of agricultural practice on the diversity of Arbuscular mycorrhizal fungi (AMF, Glomeromycota) continues to be an important research question as these mutualistic symbionts are known to improve plant growth and soil quality. To this day, studies of community diversity in AMF have exclusively been based on nuclear ribosomal gene regions, such as the small and large subunits and the ITS region. In the Glomeromycota, these regions show high intra-organism polymorphism, which can seriously complicate interpretation of diversity data. We chose the rpb1 gene as an alternative marker as this putative single-copy gene has been shown to be monomorphic within fungal isolates but shows a…