7 research outputs found

    Charged-particle nuclear modification factors in PbPb and pPb collisions at √=sNN=5.02 TeV

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    The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √ sNN = 5.02 TeV are measured using 404 µb −1 of PbPb and 27.4 pb−1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT < 400 GeV in pp and 0.7 < pT < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7–8 in the pT region of 6–9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT > 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity

    Seasonal patterns of bacterioplankton composition in a semi-intensive European seabass (Dicentrarchus labrax) aquaculture system

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    Management of microbial communities in aquaculture systems to maximize and increase productivity has been gaining interest in recent years. A first step towards the development of aquaculture microbial management strategies is to understand the dynamics of microbial communities in these systems. Here we applied an in-depth 16S rRNA gene based high-throughput sequencing approach to study seasonal variation over a one-year period (with samples collected every two months) in the structure of bacterioplankton communities of a semi-intensive European seabass (Dicentrarchus labrax) aquaculture system and surrounding estuarine water. Despite seasonal variation, the aquaculture waters maintained a distinct bacterioplankton community throughout the year, characterized by a lower richness and a dominance of OTUs mainly assigned to the Rhodobacterales and Flavobacteriales orders. The overall analysis of bacterioplankton community dynamics showed an increased dominance of potential fish pathogens in estuarine water in September along with shifts in water pH, temperature, total organic carbon (TOC) and a reduction in the relative abundance of putative antagonistic bacterial groups, namely, the Roseobacter group and the Actinomycetales order. Interestingly, disease outbreak and fish mortality was observed during the following sampling event. This study emphasizes the importance of a better understanding of the influence of environmental variables and the dynamics of fish pathogens and naturally occurring putative antagonistic bacteria in order to develop pathogen control strategies in semi-intensive aquaculture systems.publishe

    Charged-particle nuclear modification factors in PbPb and pPb collisions at root s(NN)=5.02 TeV

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