El delito de coacciones

Fil: Devoto, Eleonora A. Universidad de Buenos Aires. Facultad de Derecho. Cátedra Derecho Penal II. Buenos Aires, ArgentinaTemas de Derecho Penal I

The Biological Speciation and Toxicokinetics of Aluminum

This review discusses recent literature on the chemical and physiological factors that influence the absorption, distribution, and excretion of aluminum in mammals, with particular regard to gastrointestinal absorption and speciation in plasma. Humans encounter aluminum, a ubiquitous yet highly insoluble element in most forms, in foods, drinking water, and pharmaceuticals. Exposure also occurs by inhalation of dust and aerosols, particularly in occupational settings. Absorption from the gut depends largely on pH and the presence of complexing ligands, particularly carboxylic acids, with which the metal can form absorbable neutral aluminum species. Uremic animals and humans experience higher than normal body burdens of aluminum despite increased urinary clearance of the metal. In plasma, 80-90% of aluminum binds to transferrin, an iron-transport protein for which receptors exist in many tissue. The remaining fraction of plasma aluminum takes the form of small-molecule hydroxy species and small complexes with carboxylic acids, phosphate, and, to a much lesser degree, amino acids. Most of these species have not been observed in vivo but are predicted from equilibrium models derived from potentiometric methods and NMR investigations. These models predict that the major small-molecule aluminum species under plasma conditions are charged and hence unavailable for uptake into tissues

Extended Gauge Principle and Quantization of Gauge Theories

Fil:Catren, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Devoto, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina

High energy photon-neutrino interactions

A general decomposition of the amplitudes for the $2\to 2$ processes gauge invariance and Bose symmetry. The restrictions implied by this decomposition are investigated for the reaction $\gamma\gamma\to\nu\bar{\nu}$ by computing the one-loop helicity amplitudes in the standard model. In the center of mass, where $\sqrt{s} = 2\omega$, the cross section grows roughly as Astrophysical implications of very high energy photon-neutrino interactions are discussed

Deformacion bajo carga a elevadas temperaturas de materiales refractarios

Se presenta una técnica de ensayo que permite obtener resultados reales de deformación bajo carga a elevadas temperaturas . Se ensayaron siete arcillas refractarias argentinas, en estado natural y previamente calcinadas a 1 450°c. Se presentan las curvas de aplastamiento obtenidas y las características físico-químicas de los materiales ensayados. Se exponen conclusiones referentes al método de ensayo y al comportamiento de las arcillas estudiadas. Como complemento se dan a conocer los resultados obtenidos en ensayos realizados sobre ladrillos refractarios sílico- aluminosos de fabricación nacional.A testing technique is presented which allows to obtain more accurate results of deformation under load at high temperatures . Seven refractory clays were tested, in his natural state and heated at 145°C. Curves of deformation under load obtained and physico-chemical chracteristics of tested materials are given. Conclusions are drawn with reference to the testing method and the behaviour of studied clays. As a complement, results obtained when testing a series , of silico-aluminous refractory bricks, are included

High energy photon-neutrino elastic scattering

The one-loop helicity amplitudes for the elastic scattering process $\gamma\nu\to\gamma\nu$ in the Standard Model are computed at high center of mass energies. A general decomposition of the amplitudes is utilized to investigate the validity of some of the key features of our results. In the center of mass, where $\sqrt{s} = 2\omega$, the cross section grows roughly as $\omega^6$ to near the threshold for $W$-boson production, $\sqrt{s} = m_W$. Although suppressed at low energies, we find that the elastic cross section exceeds the cross section for $\gamma\nu\to\gamma\gamma\nu$ when $\sqrt{s}>13$ GeV. We demonstrate that the scattered photons are circularly polarized and the net value of the polarization is non-zero. Astrophysical implications of high energy photon-neutrino scattering are discussed.Comment: 9 pages, 7 figures, RevTeX

Low-mass dark matter search with the DarkSide-50 experiment

We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below 20 GeV=c2using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1 keVee. The observed rate in the detector at 0.5 keVee is about 1.5 event=keVee=kg=d and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV=c2for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6 GeV=c2