Cosmological status of Lagrangian theory of density perturbations

We show that hydrodynamical and field approaches in theory of cosmological scalar perturbations are equivalent for a single medium. We also give relations between notations introduced by V. Lukash, J. Bardeen, J. Bardeen et al. and G. Chibisov and V. Mukhanov.Comment: 8 pages, no figures, submitted to Astronomy Report

Observation of Weyl nodes in TaAs

In 1929, H. Weyl proposed that the massless solution of Dirac equation represents a pair of new type particles, the so-called Weyl fermions [1]. However the existence of them in particle physics remains elusive for more than eight decades. Recently, significant advances in both topological insulators and topological semimetals have provided an alternative way to realize Weyl fermions in condensed matter as an emergent phenomenon: when two non-degenerate bands in the three-dimensional momentum space cross in the vicinity of Fermi energy (called as Weyl nodes), the low energy excitation behaves exactly the same as Weyl fermions. Here, by performing soft x-ray angle-resolved photoemission spectroscopy measurements which mainly probe bulk band structure, we directly observe the long-sought-after Weyl nodes for the first time in TaAs, whose projected locations on the (001) surface match well to the Fermi arcs, providing undisputable experimental evidence of existence of Weyl fermion quasiparticles in TaAs.Comment: 10 pages, 4 figures, see also related papers on TaAs arXiv:1501.00060, arXiv:1502.0468

ACUTE KIDNEY INJURY AFTER HEART TRANSPLANTATION: RISK FACTORS AND RENAL REPLACEMENT THERAPY

Acute kidney injury (AKI) is a frequent complication after heart transplantation (HT). For the identification of risk factors of AKI and optimal modes of renal replacement therapy (RRT) 86 HT data was analyzed. AKI was observed in 37 cases. The main risk factors were renal failure before HT, heart transplant dysfunction and requirement in mechanical support. Continuous RRT was preferable due to the best control of patient’s volumes. The widening of indications for RRT was associated with better survival. In the cases of AKI occurrence the long-term (>10 years) prognosis was worsening significantly

PREVENTION AND TREATMENT OF ACUTE KIDNEY INJURY AFTER CARDIAC SURGERY WITH CARDIOPULMONARY BYPASS AND HEART TRANSPLANTATION

Acute renal failure is one of the most frequent and life-threatening complications after cardiac surgery, which determines the outcome. The priority is the development of preventive measures and best treatments, in the first place – renal replacement therapy (RRT). To date, any medicines with proven nephroprotective properties is unknown. According to some reports, the use of prophylactic dialysis reduces the need for postoperative RRT. Continuous and intermittent methods of RRT are complementary. Early or even prophylactic use of RRT with increasing effectiveness are the current trends. However, it is unclear where is the limit of extended indications for RRT and what it`s optimal dose