14,038 research outputs found
Prevention of Protein Glycation by Natural Compounds
Non-enzymatic protein glycosylation (glycation) contributes to many diseases and aging of organisms. It can be expected that inhibition of glycation may prolong the lifespan. The search for inhibitors of glycation, mainly using in vitro models, has identified natural compounds able to prevent glycation, especially polyphenols and other natural antioxidants. Extrapolation of results of in vitro studies on the in vivo situation is not straightforward due to differences in the conditions and mechanism of glycation, and bioavailability problems. Nevertheless, available data allow to postulate that enrichment of diet in natural anti-glycating agents may attenuate glycation and, in consequence, ageing
Two particle correlations from the energy scan with p+p interactions
The NA61/Shine experiment aims to discover the critical point of strongly
interacting matter and study the properties of the onset of deconfinement.
These goals are to be achieved by performing a two dimensional phase diagram
T-mu_B scan by measurements of hadron production properties in proton-proton,
proton-nucleus and nucleus-nucleus interactions as a function of collision
energy and system size. Close to the phase transition and/or close to the
critical point large fluctuations are predicted. In this contribution
preliminary results on two-particle correlations in pseudorapidity and
azimuthal angle will be presented for p+p interactions at beam momenta: 20, 31,
40, 80 and 158 GeV/c. The NA61/Shine results will be compared with the
corresponding data of other experiments and model predictions. A striking
evolution with collision energy is observed
Mordell-Weil ranks of families of elliptic curves associated to Pythagorean triples
We study the family of elliptic curves parametrized by
Pythagorean triples . We prove that for a generic triple the lower
bound of the rank of the Mordell-Weil group over is 1, and for
some explicitly given infinite family the rank is 2. To each family we attach
an elliptic surface fibered over the projective line. We show that the lower
bounds for the rank are optimal, in the sense that for each generic fiber of
such an elliptic surface its corresponding Mordell-Weil group over the function
field has rank 1 or 2, respectively. In order to prove this, we
compute the characteristic polynomials of the Frobenius automorphisms acting on
the second -adic cohomology groups attached to elliptic surfaces of
Kodaira dimensions 0 and 1.Comment: 19 page
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