Doris Walter. La domestication de la nature dans les Andes péruviennes: l’alpiniste, le paysan et le Parc National du Huascarán

Este libro, publicado en el 2003, es una versión abreviada de la tesis de doctorado en antropología sustentada en el 2002 por Doris Walter. Luego de un corto prefacio en el que Thérèse Bouysse-Cassagne nos recuerda la trayectoria y el enfoque casi atípico de la autora, alpinista y etnóloga, Doris Walter define en su introducción los fundamentos de su investigación. El medio escogido es el de las grandes alturas, la hallqa, de la Cordillera Blanca y de sus múltiples glaciares de más de 5 000 m..

Uptake of 18F-fluorocholine, 18F-fluoro-ethyl- L -tyrosine and 18F-fluoro-2-deoxyglucose in F98 gliomas in the rat

Introduction: The positron emission tomography (PET) tracers 18F-fluoro-ethyl-L-tyrosine (FET), 18F-fluorocholine (N,N-dimethyl-N-[18F]fluoromethyl-2-hydroxyethylammonium (FCH]) and 18F-fluoro-2-deoxyglucose (FDG) are used in the diagnosis of brain tumours. The aim of this study was threefold: (a) to assess the uptake of the different tracers in the F98 rat glioma, (b) to evaluate the impact of blood-brain barrier (BBB) disruption and microvessel density (MVD) on tracer uptake and (c) to compare the uptake in the tumours to that in the radiation injuries (induced by proton irradiation of healthy rats) of our previous study. Methods: F98 gliomas were induced in 26 rats. The uptake of FET, FCH and FDG was measured using autoradiography and correlated with histology, disruption of the BBB and MVD. Results: The mean FET, FCH and FDG standardised uptake values (SUVs) in the tumour and the contralateral normal cortex (in parentheses) were 4.19±0.86 (1.32±0.26), 2.98±0.58 (0.51±0.11) and 11.02±3.84 (4.76±1.77) respectively. MVD was significantly correlated only with FCH uptake. There was a trend towards a negative correlation between the degree of BBB disruption and FCH uptake and a trend towards a positive correlation with FET uptake. The ratio of the uptake in tumours to that in the radiation injuries was 1.97 (FCH), 2.71 (FET) and 2.37 (FDG). Conclusion: MVD displayed a significant effect only on FCH uptake. The degree of BBB disruption seems to affect the accumulation of FET and FCH, but not FDG. Mean tumour uptake for all tracers was significantly higher than the accumulation in radiation injurie

Jet energy measurement with the ATLAS detector in proton-proton collisions at root s=7 TeV

The jet energy scale and its systematic uncertainty are determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a centre-of-mass energy of √s = 7TeV corresponding to an integrated luminosity of 38 pb-1. Jets are reconstructed with the anti-kt algorithm with distance parameters R=0. 4 or R=0. 6. Jet energy and angle corrections are determined from Monte Carlo simulations to calibrate jets with transverse momenta pT≥20 GeV and pseudorapidities {pipe}η{pipe}<4. 5. The jet energy systematic uncertainty is estimated using the single isolated hadron response measured in situ and in test-beams, exploiting the transverse momentum balance between central and forward jets in events with dijet topologies and studying systematic variations in Monte Carlo simulations. The jet energy uncertainty is less than 2. 5 % in the central calorimeter region ({pipe}η{pipe}<0. 8) for jets with 60≤pT<800 GeV, and is maximally 14 % for pT<30 GeV in the most forward region 3. 2≤{pipe}η{pipe}<4. 5. The jet energy is validated for jet transverse momenta up to 1 TeV to the level of a few percent using several in situ techniques by comparing a well-known reference such as the recoiling photon pT, the sum of the transverse momenta of tracks associated to the jet, or a system of low-pT jets recoiling against a high-pT jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, aiming for an improved jet energy resolution and a reduced flavour dependence of the jet response. The systematic uncertainty of the jet energy determined from a combination of in situ techniques is consistent with the one derived from single hadron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for isolated jets in an inclusive sample of high-pT jets. Special cases such as event topologies with close-by jets, or selections of samples with an enhanced content of jets originating from light quarks, heavy quarks or gluons are also discussed and the corresponding uncertainties are determined. © 2013 CERN for the benefit of the ATLAS collaboration

Measurement of the inclusive and dijet cross-sections of b-jets in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

The inclusive and dijet production cross-sections have been measured for jets containing b-hadrons (b-jets) in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV, using the ATLAS detector at the LHC. The measurements use data corresponding to an integrated luminosity of 34 pb^-1. The b-jets are identified using either a lifetime-based method, where secondary decay vertices of b-hadrons in jets are reconstructed using information from the tracking detectors, or a muon-based method where the presence of a muon is used to identify semileptonic decays of b-hadrons inside jets. The inclusive b-jet cross-section is measured as a function of transverse momentum in the range 20 < pT < 400 GeV and rapidity in the range |y| < 2.1. The bbbar-dijet cross-section is measured as a function of the dijet invariant mass in the range 110 < m_jj < 760 GeV, the azimuthal angle difference between the two jets and the angular variable chi in two dijet mass regions. The results are compared with next-to-leading-order QCD predictions. Good agreement is observed between the measured cross-sections and the predictions obtained using POWHEG + Pythia. MC@NLO + Herwig shows good agreement with the measured bbbar-dijet cross-section. However, it does not reproduce the measured inclusive cross-section well, particularly for central b-jets with large transverse momenta.Comment: 10 pages plus author list (21 pages total), 8 figures, 1 table, final version published in European Physical Journal

Measurement of the cross-section for b-jets produced in association with a Z boson at root s=7 TeV with the ATLAS detector ATLAS Collaboration

A measurement is presented of the inclusive cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of root s = 7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb(-1). The event selection requires a Z boson decaying into high P-T electrons or muons, and at least one b-jet, identified by its displaced vertex, with transverse momentum p(T) > 25 GeV and rapidity vertical bar y vertical bar < 2.1. After subtraction of background processes, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order

Publication sur Huanchaquito

Dans le cadre d'un ouvrage collectif sur le pastoralisme dans les Andes, un chapitre portait sur les premiers résultats des analyses archéozoologiques menées sur les restes de camélidés mis au jour à Huanchaquito. Dépôt d'un camélidé sacrifié à Huanchaquito © Nicolas Goepfert Cette découverte correspond à un sacrifice massif de près de 140 enfants et 200 camélidés effectué à la période Chimu, aux alentours de 1450 apr. J.-C.. Il s'agit du plus important évènement de ce type connu aujourd'hu..

El Niño et l’archéologie andine. Les deux faces d’un phénomène hors-norme

National audienc

New zooarchaeological and funerary perspectives on Mochica culture (a.d. 100–800), Peru

International audienceThe Mochica culture developed on the northern Peruvian coast between a.d. 100 and 800. A zooarchaeological study of the remains discovered in graves at four main ceremonial sites—Sipán, San José de Moro, El Brujo, and Moche—provides evidence of 12 sacrificed species including domestic animals such as llamas, dogs, and guinea pigs, and wild animals such as bats and parrots. A comparison of zooarchaeological data with Mochica iconography shows that animals served a variety of ritual purposes, for example, as mortuary food and as guides for souls of the dead in the afterlife. They were also considered to be mediators between the world of the living and that of the dead. This study enhances our understanding of funerary and sacrificial rituals linked to animals in Mochica society as well as in the central Andes. (source éditeur

FÊTE DE LA SCIENCE

L’équipe de Camelandes a participé à la Fête de la Science (7-15 octobre 2018) dans le cadre des Portes Ouvertes du bâtiment d’Anatomie Comparée du Muséum national d’Histoire naturelle de Paris. Organisé par l’UMR 7209, ces deux journées (14-15 octobre) comprenait une aire de fouille où les enfants pouvaient découvrir le métier d’archéologue et de nombreux ateliers réunissant archéozoologues et archéobotanistes autour de leurs thèmes de recherche (domestication, pratiques d’élevage, agricultu..