Momentum-dependent scaling exponents of nodal self-energies measured in strange metal cuprates and modelled using semi-holography.

The anomalous strange metal phase found in high-Tc cuprates does not follow the conventional condensed-matter principles enshrined in the Fermi liquid and presents a great challenge for theory. Highly precise experimental determination of the electronic self-energy can provide a test bed for theoretical models of strange metals, and angle-resolved photoemission can provide this as a function of frequency, momentum, temperature and doping. Here we show that constant energy cuts through the nodal spectral function in (Pb,Bi)2Sr2-xLaxCuO6+δ have a non-Lorentzian lineshape, consistent with a self-energy that is k dependent. This provides a new test for aspiring theories. Here we show that the experimental data are captured remarkably well by a power law with a k-dependent scaling exponent smoothly evolving with doping, a description that emerges naturally from anti-de Sitter/conformal-field-theory based semi-holography. This puts a spotlight on holographic methods for the quantitative modelling of strongly interacting quantum materials like the cuprate strange metals.

[The etiological and pathogenetic bases of nephrolithiasis]. / Etiologicheskie i patogeneticheskie osnovy nefrolitiaza.

A new outlook on etiology and pathogenesis of nephrolithiasis regards renal tubular acidosis (RTA) as the basic pathogenetic factor of nephrolithiasis. These conclusions were made basing on the findings on blood and urine glycolysis enzymes, lactic acid, acid-base metabolism, titrated acids, ammonium. RTA stages responsible for the variety of the forming concrement and two groups of nephrolithiasis etiological factors (acting on epithelial cell of the nephron and involved in urinary processes) are distinguished.

[The nature of the homeostatic changes in nephrolithiasis patients]. / Kharakter izmeneniia gomeostaza u bol'nykh nefrolitiazom.

Rheorenographic findings, activities of 4 major glycolytic enzymes and 3 Krebs cycle ones in serum and blood, urinary fibrinolytic activity were analyzed in 117 patients with coral nephrolithiasis (the pelvis was drained after calculus removal) in 114 patients with non-coral calculi (the pelvis was sutured) before and 7, 14 days after surgery. Rheography revealed a significant decrease in arterial vascular tone and blood filling and an impairment in venous return in the diseased kidney. In the patients with nephrolithiasis, the enzymatic activity showed 3.5-10.5- and 4.5-11.5-fold increase (p less than 0.001) in the Krebs cycle and glycolysis, respectively, suggesting activation of not only oxidative phosphorylation, but anaerobic glycolysis. Tubular metabolic acidosis occurred, which made the enzymes enter blood and urine from the epithelial cells. On days 7-14 of postoperation, rheographic parameters, enzymatic and fibrinolytic activities of the urine remained virtually unchanged as compared to the values observed in the preoperative period. Moreover, the patients with a sutured pelvis showed highly accelerated glycolysis during the surgery against prior to the procedure. Urinary mitochondrial enzyme release increased, which reflected an enhancement of degenerative changes in nephron cells. Urinary fibrinolytic activity remained lower. In the patients with a drained pelvis, all the parameters in question became better.

[Results of radionuclide study of the single kidney remaining after nephrectomy in nephrolithiasis]. / Rezul'taty radionuklidnogo issledovaniia edinstvennoi pochki, ostavsheisia posle nefréktomii po povodu nefrolitiaza.

Computerized dynamic gamma scintigraphy with indirect radionuclide angiography was carried out in 29 patients with a single kidney. It was found that patients with a single kidney show already at the stage of "intact" organ persistent disorders of intrarenal hemodynamic processes as well as chronic urostasis. This variant of radionuclide examination may be used in the prophylactic management of this category of patients.