Leptoquark effects on ν τ propagation in the Earth

The proposal of pilgrim dark energy is based on the idea that phantom dark energy possesses enough resistive force to preclude black hole formation. We work on this proposal by choosing an interacting framework with cold dark matter and three cutoffs such as Hubble as well as event horizon and conformal age of the universe. We present a graphical analysis and focus our study on the pilgrim dark energy as well as interacting parameters. It is found that these parameters play an effective role on the equation of state parameter for exploring the phantom region of the universe. We also make the analysis of ω–ω′ and point out freezing region in the ω–ω′ plane. Finally, it turns out that the ΛCDM is achieved in the statefinders plane for all models.     

Using radiative corrections to bound substructure

Composite models predict the existence of excited quarks and leptons. We find bounds for the masses of possible excited leptons and for the substructure scale by using radiative corrections at theZ scale. A non-decoupling scenario arises naturally which induces upper bounds on these masses as a function of the substructure scale.     

Neutrino–nucleon cross section at intermediate energy from KM3 neutrino telescopes

The capability of a KM³ neutrino telescope to bounds the neutrino–nucleon cross section in the intermediate energy range (10⁵ GeV<E<10⁷ GeV) is studied. We use an observable which only makes use of the upward-going neutrino flux, so that the Earth filters the atmospheric muons, and it is only weakly dependent on the initial astrophysical flux uncertainties and experimental systematic. In order to study the sensitivity to departures from the standard model we have considered a cross section which is a version perturbed of the standard model one, dependent of two parameters. We present the results as regions for the allowed values for both, the parameters space and the cross section.     

Liquid chromatographic analysis of clenbuterol residues in food products of animal origin (cow liver) using diphasic dialysis extraction

Summary This paper reports a method employing diphasic dialysis extraction for the rapid confirmation of clenbuterol in cow liver by RPHPLC with diode-array detection. The most suitable means of homogenizing the liver is in barium hydroxide-barium chloride buffer; the optimum extraction solvent istert-butyl methyl ether at an extraction temperature of 37°C; stirring should be applied at 150 r.p.m. for 4h. This extraction method improves clenbuterol recovery values to 98.9%.     

Uptake of lead and its influence in the alga Selenastrum capricornutum printz

The influence of nutrient level, hours of fight and the flux of air by volume of solution on uptake of lead has been examined from batch growth experiments carried out with the alga Selenastrum capricornutum Printz. The organic matter released by the alga has been characterized in terms of absorbance at 285 nm, dissolved organic carbon and maximum intensity of fluorescence at the excitation peak. The lability of lead complexes formed with the alga exudates has been investigated in terms of differential pulse anodic stripping voltammetry (DPASV). It has been noticed that lead inhibits the division of the cells which become bigger in size but with less pigment per cell.