Institution
National University of La Plata
Education•La Plata, Argentina•
About: National University of La Plata is a education organization based out in La Plata, Argentina. It is known for research contribution in the topics: Population & Stars. The organization has 12993 authors who have published 30013 publications receiving 495118 citations. The organization is also known as: UNLP & Universidad Nacional de La Plata.
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TL;DR: In this paper, the authors study the problem of convergence of perturbation expansions when the hermiticity of the Hamiltonian is relaxed to a weaker symmetry, and describe its perturbative features paying particular attention to the strong coupling regime.
Abstract: We study the traditional problem of convergence of perturbation expansions when the hermiticity of the Hamiltonian is relaxed to a weaker symmetry. An elementary and quite exceptional cubic anharmonic oscillator is chosen as an illustrative example of such models. We describe its perturbative features paying particular attention to the strong-coupling regime. Efficient numerical perturbation theory proves suitable for such a purpose.
139 citations
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TL;DR: In this paper, the authors examined the changes in composition of fish assemblages for all seasons in the Rio de la Plata estuary (36°S, 56°W), and identified the parameters that control the main structuring of the estuarine community.
138 citations
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TL;DR: Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, the authors performed a systematic optical spectroscopic study of 39 putative counterparts of unknown hard X-ray sources in order to determine or at least better assess their nature.
Abstract: Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of our campaign to reveal the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 29 of these objects are active galactic nuclei (13 of which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5 with high-mass companions and 2 with low-mass secondaries), one is a magnetic cataclysmic variable, one is a symbiotic star and one is possibly an active star. Thus, the large majority (74%) of the identifications in this sample belongs to the AGN class. When possible, the main physical parameters for these hard X-ray sources were also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in studying the hard X-ray spectra of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of still unidentified hard X-ray sources.
138 citations
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TL;DR: The aim of the present work was to isolate and identify kefir yeasts and select those with acid and bile tolerance to study their adhesion to epithelial cells and their transit through mouse gut.
Abstract: Kefir—a traditional beverage whose consumption has been associated with health benefits—is a logical natural product to investigate for new probiotic strains. The aim of the present work was to isolate and identify kefir yeasts and select those with acid and bile tolerance to study their adhesion to epithelial cells and their transit through mouse gut. From 4 milky and 3 sugary kefir grains, 34 yeast strains were isolated and identified by means of classical microbiological and molecular-genetic methods (whole-cell protein pattern, internal-transcribed-spacer amplification, and analysis of restriction-fragment–length polymorphisms). We identified 4 species belonging to 3 genera—Saccharomyces cerevisiae (15 strains), Saccharomyces unisporus (6 strains), Issatchenkia occidentalis (4 strains), and Kluyveromyces marxianus (9 strains)—and selected 13 strains on the basis of resistance to low pH and bile salts. Among the strains selected, Kluyveromyces marxianus CIDCA 8154 and Saccharomyces cerevisiae CIDCA 8112 were further studied. Both strains evidenced the capacity to adhere to epithelial intestine-derived cells in vitro and to survive passage through the gastrointestinal tract of BALB/c mice. The investigation of the potential probiotic features of these kefir-yeast strains should be useful for the development of novel functional foods.
138 citations
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Aix-Marseille University1, University of Oklahoma2, University of Massachusetts Amherst3, University of Pavia4, University of Göttingen5, Royal Holloway, University of London6, University of Toronto7, Niels Bohr Institute8, University of Sussex9, Tel Aviv University10, Technion – Israel Institute of Technology11, Argonne National Laboratory12, King's College London13, International Centre for Theoretical Physics14, University of Tokyo15, University of Mainz16, University of Savoy17, AGH University of Science and Technology18, Northern Illinois University19, Ludwig Maximilian University of Munich20, Boğaziçi University21, University of Geneva22, Rutherford Appleton Laboratory23, Santa Cruz Institute for Particle Physics24, Université Paris-Saclay25, University of Auvergne26, Radboud University Nijmegen27, Alexandru Ioan Cuza University28, Spanish National Research Council29, University of Granada30, Joint Institute for Nuclear Research31, McGill University32, Lawrence Berkeley National Laboratory33, University of Rome Tor Vergata34, Kyoto University35, Russian Academy of Sciences36, University of Bologna37, University of Victoria38, CERN39, National Technical University of Athens40, University of Amsterdam41, Czech Technical University in Prague42, Tomsk State University43, University of Washington44, University of Oregon45, University of Birmingham46, University of Copenhagen47, National University of La Plata48, University of Glasgow49, Autonomous University of Madrid50, Federal University of Rio de Janeiro51, University of Oxford52, Brandeis University53, University of Michigan54, Iowa State University55, University of Sheffield56, University of Texas at Austin57, Heidelberg University58, University of Bern59, University of Milan60, Columbia University61, Budker Institute of Nuclear Physics62, Novosibirsk State University63, Oklahoma State University–Stillwater64, University of California, Irvine65, KEK66, Chinese Academy of Sciences67
TL;DR: In this article, a search for new resonances decaying into a pair of jets is reported using the dataset of proton-proton collisions recorded at s = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018.
Abstract: A search for new resonances decaying into a pair of jets is reported using the dataset of proton-proton collisions recorded at s = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb−1. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the Standard Model background. In addition to an inclusive dijet search, events with jets identified as containing b-hadrons are examined specifically. No significant excess of events above the smoothly falling background spectra is observed. The results are used to set cross-section upper limits at 95% confidence level on a range of new physics scenarios. Model-independent limits on Gaussian-shaped signals are also reported. The analysis looking at jets containing b-hadrons benefits from improvements in the jet flavour identification at high transverse momentum, which increases its sensitivity relative to the previous analysis beyond that expected from the higher integrated luminosity.
138 citations
Authors
Showing all 13198 results
Name | H-index | Papers | Citations |
---|---|---|---|
David Cameron | 154 | 1586 | 126067 |
Subir Sarkar | 149 | 1542 | 144614 |
Mayda Velasco | 137 | 1309 | 87579 |
Diego F. Torres | 137 | 948 | 72180 |
Heidi Sandaker | 128 | 999 | 76517 |
Vincent Garonne | 128 | 921 | 76980 |
Farid Ould-Saada | 128 | 931 | 76394 |
Ole Røhne | 128 | 1038 | 75752 |
Peter Hansen | 128 | 1271 | 86210 |
Maria-Teresa Dova | 127 | 778 | 73558 |
Vladimir Sulin | 127 | 884 | 75329 |
Andrei Snesarev | 127 | 875 | 74907 |
James Catmore | 127 | 892 | 75086 |
Ruslan Mashinistov | 126 | 860 | 73897 |
Fernando Monticelli | 126 | 843 | 73385 |