ABSTRACT
This Letter presents the measurement of near-side associated per-trigger yields, denoted ridge yields, from the analysis of angular correlations of charged hadrons in proton-proton collisions at sqrt[s]=13 TeV. Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity difference of 1.4<|Δη|<1.8 and a transverse momentum of 1
ABSTRACT
The first measurement of the cross section for incoherent photonuclear production of J/ψ vector mesons as a function of the Mandelstam |t| variable is presented. The measurement was carried out with the ALICE detector at midrapidity, |y|<0.8, using ultraperipheral collisions of Pb nuclei at a center-of-mass energy per nucleon pair of sqrt[s_{NN}]=5.02 TeV. This rapidity interval corresponds to a Bjorken-x range (0.3-1.4)×10^{-3}. Cross sections are given in five |t| intervals in the range 0.04<|t|<1 GeV^{2} and compared to the predictions by different models. Models that ignore quantum fluctuations of the gluon density in the colliding hadron predict a |t| dependence of the cross section much steeper than in data. The inclusion of such fluctuations in the same models provides a better description of the data.
ABSTRACT
There has been considerable debate about whether the Atlantic northern bluefin tuna exist as a single panmictic unit. We have addressed this issue by examining both mitochondrial DNA control region nucleotide sequences and nuclear gene ldhA allele frequencies in replicate size or year class samples of northern bluefin tuna from the Mediterranean Sea and the northwestern Atlantic Ocean. Pairwise comparisons of multiple year class samples from the 2 regions provided no evidence for population subdivision. Similarly, analyses of molecular variance of both mitochondrial and ldhA data revealed no significant differences among or between samples from the 2 regions. These results demonstrate the importance of analyzing multiple year classes and large sample sizes to obtain accurate estimates when using allele frequencies to characterize a population. It is important to note that the absence of genetic evidence for population substructure does not unilaterally constitute evidence of a single panmictic population, as genetic differentiation can be prevented by large population sizes and by migration.
ABSTRACT
No disponible
Subject(s)
Humans , Phosphorus/blood , Renal Insufficiency, Chronic/complications , Phosphorus Metabolism Disorders/physiopathology , Renal DialysisABSTRACT
El riñón es un órgano capaz de modular los cambios de presión arterial, ya que dispone de mecanismos capaces de modificar los factores hemodinámicos que le sustentan, como son la volemia y el volumen de expulsión, y las resistencias periféricas. Sobre estas bases no parece extraño que el riñón pueda estar en la génesis de algunas formas de hipertensión o, al menos, participando de su mantenimiento. Por otro lado, también es preciso enfatizar el hecho de que la hipertensión arterial acelera el curso de las nefropatías, sobre todo si cursan con proteinuria moderada/severa. En estos enfermos el objetivo sería disminuir las cifras de presión arterial incluso hasta 125/75 mmHg (AU)