105 research outputs found

    Hematology and Plasma Chemistry as Indicators of Health and Ecological Status In Beluga Whales, Delphinapterus Leucas

    Get PDF
    The capture of beluga whales, Delphinapterus leucas, for instrumentation or tagging afforded the opportunity to collect blood, which was analyzed to evaluate the animals' health and gain information on basic physiological systems. Here, we report on hematological and plasma chemical constituents in samples obtained from 183 belugas, 55 of which were handled during attempts to apply tracking instruments. The other 128 samples were either drawn from live belugas captured for exhibit in zoological parks or research or obtained from the fresh carcasses of whales taken by Inuit hunters. The data span a 15-year period beginning in 1983 and represent various beluga stocks in the Canadian Arctic. The majority of the specimens were collected during the summer or estuarine phase of the belugas' annual cycle. Comparisons by age group, sex, stock, season, and year revealed significant differences in most of the cellular and chemical constituents examined. These results demonstrate some of the variability that might be encountered when examining a "random" selection of belugas at a particular location and time. Immature-sized whales had higher leucocyte counts, electrolyte concentrations, enzyme activity, total protein, albumin, hemoglobin, and some metabolites than older animals. Sex alone was associated with few hematological and plasma chemical differences. Seasonal variation in thyroid hormone activity was linked to marked environmental changes associated with the transition from cold oceanic waters to relatively warm estuaries. Two belugas recaptured 19 and 24 days after instrumentation showed changes in leucocyte counts, hematocrit, and a variety of plasma chemical constituents, some of which indicate inflammation and a likely physiological response to handling and tagging stresses.On a profité du fait qu'on capturait des bélougas, Delphinapterus leucas, en vue de les équiper d'instruments ou de les marquer, pour prélever des échantillons de sang qu'on a ensuite analysés afin d'évaluer l'état de santé des individus et de collecter de l'information sur leurs grands systèmes physiologiques. Nous présentons ici un rapport sur les constituants hématologiques et chimiques du plasma dans des échantillons provenant de 183 bélougas, dont 55 ont été manipulés au cours de tentatives visant à les équiper d'instruments de poursuite. Les 128 autres échantillons ont été obtenus soit de bélougas vivants capturés en vue d'être placés dans des zoos ou pour la recherche, soit de carcasses fraîches de baleines prises par les chasseurs inuits. Les données couvrent une période de 15 ans, commençant en 1983, et représentent divers stocks de bélougas de l'océan Arctique canadien. La plupart des spécimens ont été recueillis durant l'été ou durant la phase estuarienne du cycle annuel du bélouga. Des comparaisons par groupe d'âge, sexe, stock, saison et année ont révélé des différences marquées dans la plupart des constituants cellulaires et chimiques examinés. Ces résultats font ressortir une certaine variabilité à laquelle on peut s'attendre quand on étudie un échantillon "aléatoire" de bélougas pris à un endroit et à un moment donnés. Par rapport à des individus plus âgés, les baleines qui n'avaient pas atteint leur taille adulte avaient un compte de globules blancs plus élevé, de même qu'une plus forte concentration d'électrolytes, une plus grande activité enzymatique, et un taux plus fort d'albumine, d'hémoglobine et de certains métabolites. Le sexe seul n'était associé qu'à quelques différences hématologiques et chimiques du plasma. Une variation saisonnière de l'activité des hormones thyroïdiennes était liée à des changements nets du milieu correspondant à la transition des eaux froides océaniques aux estuaires relativement chauds. Deux bélougas recapturés 19 et 24 jours après avoir été équipés d'instruments montraient des changements dans le compte de globules blancs, dans l'hématocrite et dans divers constituants chimiques du plasma, dont certains révèlent une inflammation et probablement une réaction physiologique au stress dû à la manipulation et au marquage

    Measurement of the Z boson differential cross section in transverse momentum and rapidity in proton-proton collisions at 8 TeV

    Get PDF
    We present a measurement of the Z boson differential cross section in rapidity and transverse momentum using a data sample of pp collision events at a centre-of-mass energy s=8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The Z boson is identified via its decay to a pair of muons. The measurement provides a precision test of quantum chromodynamics over a large region of phase space. In addition, due to the small experimental uncertainties in the measurement the data has the potential to constrain the gluon parton distribution function in the kinematic regime important for Higgs boson production via gluon fusion. The results agree with the next-to-next-to-leading-order predictions computed with the fewz program. The results are also compared to the commonly used leading-order MadGraph and next-to-leading-order powheg generators. © 2015 CERN for the benefit of the CMS Collaboration

    Identification techniques for highly boosted W bosons that decay into hadrons

    Get PDF

    Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at

    Get PDF

    Search for new phenomena in monophoton final states in proton-proton collisions at root s=8 TeV

    Get PDF
    Peer reviewe

    Search for neutral resonances decaying into a Z boson and a pair of b jets or τ leptons

    Get PDF
    A search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged τ leptons or a bb‾ pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb −1 . No significant deviations are observed from the standard model expectation and limits are set on production cross sections and parameters of two-Higgs-doublet models

    Search for a low-mass pseudoscalar Higgs boson produced in association with a bb⁻ pair in pp collisions at √s=8 TeV

    Get PDF
    A search is reported for a light pseudoscalar Higgs boson decaying to a pair of tau leptons, produced in association with a b (b) over bar pair, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of 8 TeV collected by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb(-1). Pseudoscalar boson masses between 25 and 80 GeV are probed. No evidence for a pseudoscalar boson is found and upper limits are set on the product of cross section and branching fraction to tau pairs between 7 and 39 pb at the 95% confidence level. This excludes pseudoscalar A bosons with masses between 25 and 80 GeV, with SM-like Higgs boson negative couplings to down-type fermions, produced in association with bb pairs, in Type II, two-Higgs-doublet models. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommonnorg/licensesiby/4.01)

    Measurement of the inclusive 3-jet production differential cross section in proton-proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range

    Get PDF
    This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton–proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5 fb-1 collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445–3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. A comparison between the measurement and the prediction from perturbative QCD at next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to the strong coupling constant αS is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of αS(MZ)=0.1171±0.0013(exp)-0.0047+0.0073(theo)

    Forward-backward asymmetry of Drell-Yan lepton pairs in pp collisions at root s=8 TeV

    Get PDF
    Peer reviewe
    corecore