[Contrast induced nephropathy in the older age group patients].

This review devoted to actual medical problem that exists at a crossroad of cardiology, nephrology and radiology. Contrast induced nephropathy (CIN) is an important medical issue and its frequency is increasing last years. This disease may account for severe complications, including renal failure and even fatal outcome.

Gluon- and quark-jet multiplicities with NNNLO and NNLL accuracy.

We present a new approach to consider and include both the perturbative and the nonperturbative contributions to the multiplicities of gluon and quark jets. Thanks to this new method, we have included for the first time new contributions to these quantities obtaining next-to-next-to-leading-logarithmic resummed formulas. Our analytic expressions depend on two nonperturbative parameters with a clear and simple physical interpretation.

Ultrahigh-energy neutrino-nucleon deep-inelastic scattering and the Froissart bound.

We present a simple formula for the total cross section σ(νN) of neutral- and charged-current deep-inelastic scattering of ultrahigh-energy neutrinos on isoscalar nuclear targets, which is proportional to the structure function F(2)(νN)(M(V)(2)/s,M(V)(2)), where M(V) is the intermediate-boson mass and s is the square of the center-of-mass energy. The coefficient in front of F(2)(νN)(x,Q(2)) depends on the asymptotic low-x behavior of F(2)(νN). It contains an additional lns term if F(2)(νN) scales with a power of ln(1/x).

Orthopositronium lifetime: analytic results in O(alpha) and O(alpha3lnalpha).

We present the O(alpha) and O(alpha3lnalpha) corrections to the total decay width of orthopositronium in closed analytic form, in terms of basic irrational numbers, which can be evaluated numerically to arbitrary precision.

Strong-coupling constant with flavor thresholds at five loops in the modified minimal-subtraction scheme.

We present in analytic form the matching conditions for the strong-coupling constant alphas(nf) (mu) at the flavor thresholds to four loops in the modified minimal-subtraction scheme. Taking into account the present knowledge on the coefficient beta4 of the Callan-Symanzik beta function of quantum chromodynamics, we thus derive a five-loop formula for alphas(nf) (mu) together with appropriate relationships between the asymptotic scale parameters Lamda(nf) for different numbers of flavors nf.