Narrowband Searches for Continuous and Long-duration Transient Gravitational Waves from Known Pulsars in the LIGO-Virgo Third Observing Run

Isolated neutron stars that are asymmetric with respect to their spin axis are possible sources of detectable continuous gravitational waves. This paper presents a fully coherent search for such signals from eighteen pulsars in data from LIGO and Virgo's third observing run (O3). For known pulsars, efficient and sensitive matched-filter searches can be carried out if one assumes the gravitational radiation is phase-locked to the electromagnetic emission. In the search presented here, we relax this assumption and allow both the frequency and the time derivative of the frequency of the gravitational waves to vary in a small range around those inferred from electromagnetic observations. We find no evidence for continuous gravitational waves, and set upper limits on the strain amplitude for each target. These limits are more constraining for seven of the targets than the spin-down limit defined by ascribing all rotational energy loss to gravitational radiation. In an additional search, we look in O3 data for long-duration (hours-months) transient gravitational waves in the aftermath of pulsar glitches for six targets with a total of nine glitches. We report two marginal outliers from this search, but find no clear evidence for such emission either. The resulting duration-dependent strain upper limits do not surpass indirect energy constraints for any of these targets. © 2022. The Author(s). Published by the American Astronomical Society

Effet de l'emploi d'un probiotique la "Toyocerin" sur les lapines en production

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ETUDE IN VITRO DES EFFETS DE LA NICOTINE SUR DES FIBROBLASTES ISSUS D'EXPLANTS GINGIVAUX (MISE EN PLACE D'UN MODELE EXPERIMENTAL)

RENNES1-BU Santé (352382103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Microflora of the digestive tract : critical factors and consequences for poultry

International audienceThe microflora of the digestive tract of poultry is still incompletely known. Microbial populations of varying size and complexity occur throughout the digestive tract and the highest and most complex floras are found in the crop and the caeca. The upper part of the digestive tract is predominantly settled by facultative anaerobes, whereas the caeca are mainly the site of obligate anaerobes. The types, numbers and metabolic activities of the organisms are affected by numerous factors such as individual, animal age, environment, and diet. Bacteria produce various metabolites that can be useful or detrimental to the host. Interactions between bacteria and the gastrointestinal epithelium lead to various structural and functional modifications of the digestive tract. Bacteria can impair lipid digestion and may modify carbohydrate and protein digestion. They cause an increase in energy and amino acid requirements. They have a negative effect on vitamin nutrition. Beneficial bacteria can protect birds against pathogens through a competitive exclusion process. Moreover, the flora is involved in the development of the intestinal immune system. Overall, bacteria have a negative effect on bird growth. They may also have an effect on meat and egg quality. Improved knowledge of the microflora of the digestive tract and its consequences may contribute to its control and beneficial use for birds as well as breeders, consumers and the environment

Performances of xylanases on broilers fed with newly harvested wheat

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Un management stratégique à la fois sectoriel et territorial : le cas de la destination touristique. Vers un modèle multi-acteurs, multi-fonctions

National audienceLa transversalité du tourisme en fait un champ privilégié pour l'examen des relations entre une activité sectorielle et des régulations territoriales. Ainsi les travaux du projet PSDR Modintour, qui revisite les "modèles de tourisme", notamment sur la gouvernance des destinations, avec un point de vue managérial, alimentent plus largement la construction du management territorial. La communication présente l'analyse d'un large échantillon de destinations auvergnates à partir d'une grille de lecture qui croise des fonctions stratégiques et les acteurs majeurs susceptibles de les exercer. Les fonctions sont identifiées à priori à partir de trois grandes écoles stratégiques : celle du positionnement, celle des ressources et compétences et celles des parties prenantes. Les acteurs sont territoriaux, sectoriels (entre prises, réseaux),"opéracteurs de ressources touristiques". Après l'examen d'un échantillon de deux fonctions dont l'une est perçue comme principalement sectorielle (le marketing stratégique) et l'autre principalement territoriale (la gestion des ressources non dédiées au tourisme), l'analyse de la fonction d'organisation générale du système touristique local est centrée sur la construction et les évolutions d'un acteur mixte, l'organisme local de tourisme