3 documentos corresponden a la consulta.
Palabras contadas: daleo: 3
Daleo, A. - De Florian, D. - Sassot, R.
AIP Conf. Proc. 2005;792:751-754
2005
Descripción: We compute the order αs2 corrections to the one particle inclusive electroproduction cross section of hadrons with non vanishing transverse momentum. We compare our results with H1 data on forward production of π0, and conclude that the data is well described by the DGLAP approach. within the theoretical uncertainties. © 2005 American Institute of Physics.
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Daleo, A. - De Florian, D. - Sassot, R.
Braz. J. Phys. 2007;37(2 B):585-590
2007
Descripción: We analyze the order α2 s corrections to the single inclusive jet and hadron cross sections in lepton-nucleon deep inelastic scattering. The full calculations are done analytically, obtaining finite NLO partonic level cross sections for these processes. We show that in both cases the dominant partonic mechanism starts at order α2 s, being effectively a lowest order estimate, with the consequent large factorization scale uncertainty, and the likelihood of non-negligible corrections at the subsequent order in perturbation theory.
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Alberti, J. - Escapa, M. - Daleo, P. - Iribarne, O. - Silliman, B. - Bertness, M.
Mar. Ecol. Prog. Ser. 2007;349:235-243
2007
Temas: Atlantic - Chasmagnathus granulatus - Herbivory - Salt marshes - Spartina - SW - crab - geographical variation - grass - grazing pressure
Descripción: Coupling experiments at small spatial scales with large-scale surveys can help to generalize experimental results across large spatial scales. The goal of the present study was to evaluate patterns of crab herbivory within and, at a larger scale, between many southwestern (SW) Atlantic salt marshes. Hence, we conducted experiments in an Argentinean salt marsh to elucidate the effects of crab Chasmagnathus granulatus grazing on the cordgrass Spartina densiflora and the factors that can affect this interaction, and then examined the potential generality of these results across SW Atlantic salt marshes from Brazil to Argentina (15 marshes, range ≈ 2000 km). Experimental examination of the effects of crabs (control and exclusion) on marsh grass transplants, and factors that can affect them, i.e. the presence or absence of plant neighbors and marsh height (middle and low), revealed that crab herbivory decreased plant biomass and increased stem mortality; however, herbivory effects were significantly diminished in the presence of plant neighbors and with increasing marsh elevation. Our geographical survey showed that crab herbivory is common in SW Atlantic salt marshes, with more than 20 % of leaves damaged in most marshes and with greater consumption at marshes with higher crab densities. In addition, plants at the lower edge of marshes were generally the most consumed (max. >60 % leaves consumed) and crabs preferred S. alterniflora over S. densiflora. Over a regional spatial scale, our results suggest that herbivory may affect plant production at some marshes and can also play a role in limiting the lower tidal elevation limit of low-marsh plants. © Inter-Research 2007.
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