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.
Papers published on a yearly basis
Papers
More filters
••
TL;DR: In this paper, the authors present measurements of the t-channel single top-quark ((t) over bart) and top-antiquark (t) total production cross sections, their ratio Rt sdtq_= sd tq_, and a measurement of the inclusive production cross section in proton-proton collisions at ffiffiffi ps = 7 TeV at the LHC.
Abstract: This article presents measurements of the t-channel single top-quark ((t) over bart) and top-antiquark (_ t) total production cross sections sdtq_ and sd _ tq_, their ratio Rt sdtq_= sd _ tq_, and a measurement of the inclusive production cross section sdtq _ _ tq_ in proton-proton collisions at ffiffiffi ps = 7 TeV at the LHC. Differential cross sections for the tq and _ tq processes are measured as a function of the transverse momentum and the absolute value of the rapidity of t and _ t, respectively. The analyzed data set was recorded with the ATLAS detector and corresponds to an integrated luminosity of 4.59 fb-1. Selected events contain one charged lepton, large missing transverse momentum, and two or three jets. The cross sections are measured by performing a binned maximum-likelihood fit to the output distributions of neural networks. The resulting measurements are sdtq_ 46 = 1dstat_ = 6dsyst_ pb, sd _ tq_ = 23 +/- 1dstat_ = 3dsyst_ pb, Rt = 2.04 0.13dstat_ +/-=0.12dsyst_, and sdtq _ _ tq_ = 68 +/-= 2dstat_ = 8dsyst_ pb, consistent with the Standard Model expectation. The uncertainty on the measured cross sections is dominated by systematic uncertainties, while the uncertainty on Rt is mainly statistical. Using the ratio of sdtq _ _ tq_ to its theoretical prediction, and assuming that the top-quark-related CKM matrix elements obey the relation jVtbj = jVtsj; jVtdj, we determine jVtbj = 1.02 = 0.07.
97 citations
••
TL;DR: In this paper, a dataset of 87,020 nifH reads and 16,782 unique NifH protein sequences obtained over 2 years from four locations across a gradient of agricultural soil types in Argentina were analysed to provide a detailed and comprehensive picture of the diversity, abundance and responses of the N2 -fixing community in relation to differences in soil chemistry and agricultural practices.
Abstract: A dataset of 87 020 nifH reads and 16 782 unique nifH protein sequences obtained over 2 years from four locations across a gradient of agricultural soil types in Argentina were analysed to provide a detailed and comprehensive picture of the diversity, abundance and responses of the N2 -fixing community in relation to differences in soil chemistry and agricultural practices. Phylogenetic analysis revealed an expected high proportion of Alphaproteobacteria, Betaproteobacteria and Deltaproteobacteria, mainly relatives to Bradyrhizobium and Methylosinus/Methylocystis, but a surprising paucity of Gammaproteobacteria. Analysis of variance and stepwise regression modelling suggested location and treatment-specific influences of soil type on diazotrophic community composition and organic carbon concentrations on nifH diversity. nifH gene abundance, determined by quantitative real-time polymerase chain reaction, was higher in agricultural soils than in non-agricultural soils, and was influenced by soil chemistry under intensive crop rotation but not under monoculture. At some locations, sustainable increased crop yields might be possible through the management of soil chemistry to improve the abundance and diversity of N2 -fixing bacteria.
97 citations
••
TL;DR: A mechanistic model was proposed to predict orthophosphate concentrations as a function of Fe(0):P(0) at constant pH and can be applied to calculate the minimum Fe(III) concentration required to achieve a given discharge limit for orthoph phosphate as a result of its initial concentration and pH.
97 citations
••
TL;DR: Argentine hemorrhagic fever (AHF), an endemoepidemie disease of viral etiology, is geographically restricted to the central area of the Pampas, in the heart of the richest farmlands of Argentina as mentioned in this paper.
Abstract: Argentine hemorrhagic fever (AHF), an endemoepidemie disease of viral etiology, is geographically restricted to the central area of the Pampas, in the heart of the richest farmlands of Argentina. Unknown before the 1950s, its salient clinical features are hematologic and neurologic signs, including a febrile syndrome, together with varying degrees of cardiovascular, renal, and digestive alterations, first described in detail in 1955 (Arribalzaga 1955).
97 citations
••
TL;DR: The production of extracellular carbohydrates during biofilm growth was not associated with changes in the specific growth rate, growth phase, or oxygen limitation, and could represent an additional virulence factor that may help B. pertussis to evade host defenses.
Abstract: Although Bordetella pertussis, the etiologic agent of whooping cough, adheres and grows on the ciliated epithelium of the respiratory tract, it has been extensively studied only in liquid cultures. In this work, the phenotypic expression of B. pertussis in biofilm growth is described as a first approximation of events that may occur in the colonization of the host. The biofilm developed on polypropylene beads was monitored by chemical methods and Fourier transform infrared (FT-IR) spectroscopy. Analysis of cell envelopes revealed minimal differences in outer membrane protein (OMP) pattern and no variation of lipopolysaccharide (LPS) expression in biofilm compared with planktonically grown cells. Sessile cells exhibited a 2.4- to 3.0-fold higher carbohydrate/protein ratio compared with different types of planktonic cells. A 1.8-fold increased polysaccharide content with significantly increased hydrophilic characteristics was observed. FT-IR spectra of the biofilm cells showed higher intensity in the absorption bands assigned to polysaccharides (1,200–900 cm−1 region) and vibrational modes of carboxylate groups (1,627, 1,405, and 1,373 cm−1) compared with the spectra of planktonic cells. In the biofilm matrix, uronic-acid-containing polysaccharides, proteins, and LPS were detected. The production of extracellular carbohydrates during biofilm growth was not associated with changes in the specific growth rate, growth phase, or oxygen limitation. It could represent an additional virulence factor that may help B. pertussis to evade host defenses.
97 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 |