Publications by authors named "Alexey Klimov"

In this article, we investigate optically induced terahertz radiation in ferromagnetic FeCo layers of varying thickness on Si and SiO substrates. Efforts have been made to account for the influence of the substrate on the parameters of the THz radiation generated by the ferromagnetic FeCo film. The study reveals that the thickness of the ferromagnetic layer and the material of the substrate significantly affect the generation efficiency and spectral characteristics of the THz radiation.

View Article and Find Full Text PDF

Polarization of electromagnetic waves plays an extremely important role in interaction of radiation with matter. In particular, interaction of polarized waves with ordered matter strongly depends on orientation and symmetry of vibrations of chemical bonds in crystals. In quantum technologies, the polarization of photons is considered as a "degree of freedom", which is one of the main parameters that ensure efficient quantum computing.

View Article and Find Full Text PDF

Intermetallic heterostructures of rare-earth and transition metals exhibit physical properties prospective for various applications. These structures combine giant magnetostriction, controllable magnetic anisotropy, magneto-optical activity and allow spin reorientation transitions (SRT) induced by magnetic field at room temperature. Here, we present the results of a study of spin dynamics induced by ultrafast optical excitation in the [Formula: see text] heterostructure.

View Article and Find Full Text PDF

The magnetic moment dynamics excited by 35 fs laser pulses in TbCo/FeCo heterostructure is experimentally investigated by pump-probe technique. The studies are carried out in two typical geometries with magnetizing field perpendicular and along to the easy magnetization axis. In the 'easy axis' orientation, high-frequency oscillations of magnetic moments odd with respect to the sign of the magnetizing field are observed using the magneto-optical Kerr effect.

View Article and Find Full Text PDF

Hereditary papillary renal carcinoma (HPRC) is a rare autosomal dominant disease characterized by the development of multiple papillary type I renal cell carcinomas. This hereditary kidney cancer form is caused by activating mutations in . Descriptions of patients with HPRC are scarce in the world literature, and no cases have been described in open sources in Russia.

View Article and Find Full Text PDF
Article Synopsis
  • Aberrant expression of PIWI/piRNA pathway proteins is observed in various tumors, but these proteins are downregulated in testicular germ cell tumors (TGCTs) compared to normal testis.
  • The study utilized advanced sequencing and analysis methods to investigate piRNA activity at different stages of TGCT development, focusing on healthy testis, adjacent tissues, precursor GCNIS, and TGCT cells.
  • Results indicated that while piRNA biogenesis is intact in healthy testis and adjacent tissues, GCNIS and TGCT cells lose PIWI/piRNA pathway expression, though a short isoform of PIWIL2/HILI may still regulate certain transposable elements in TGCTs without typical piRNA biogenesis.
View Article and Find Full Text PDF

Silver nanoparticles (AgNPs) are well-known bactericidal agents. However, information about the influence of AgNPs on the morphometric parameters and biochemical status of most important agricultural crops is limited. The present study reports the influence of AgNPs stabilized with cationic polymer polyhexamethylene biguanide hydrochloride (PHMB) on growth, development, and biochemical status of fodder beet Beta vulgaris L.

View Article and Find Full Text PDF
Article Synopsis
  • PIWI pathway proteins are crucial for germ cell development during spermatogenesis and their decreased expression is linked to testicular germ cell tumors (TGCTs).
  • The study focuses on examining not just normal testis and TGCT samples, but also preneoplastic testis tissues next to TGCTs, using matched samples to reduce patient variability.
  • Findings reveal that spermatogenesis remains in tissues near nonseminomas while PIWI gene expression and DNA methylation patterns differ, suggesting distinct developmental pathways for TGCT types and potential for new diagnostic markers.
View Article and Find Full Text PDF