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  1. No Access

    Article

    Photooxidation of Tetrahydrobiopterin as the Basis of Vitiligo Phototherapy

    The kinetics of photooxidation of tetrahydrobiopterin was investigated, the quantum yields of the formation of dihydropterin dimers were calculated when using a xenon lamp, a tunable UV laser and a UV LED as U...

    T. A. Telegina, Yu. L. Vechtomova, M. S. Kritsky… in Optics and Spectroscopy (2023)

  2. No Access

    Article

    Tetrahydrobiopterin Photooxidation: a Key Process in Vitiligo Phototherapy

    The processes of the autooxidation and photooxidation of tetrahydrobiopterin (Н4Bip) (a coenzyme present in a three- to fivefold excess in vitiligo) were studied in the context of vitiligo pathology and treatment...

    T. A. Telegina, Yu. L. Vechtomova, M. S. Kritsky… in Applied Biochemistry and Microbiology (2021)

  3. No Access

    Article

    Spectral-Kinetic Properties and Energy Transfer in Nanoparticles of Y0.5–xCe0.5TbxF3 Solid Solution

    Crystalline nanoparticles of Y0.5–xCe0.5TbxF3, doped with various concentrations (x = 0, 0.005, 0.01, 0.05, 0.1, 0.15, and 0.2) of Tb3+ ions were synthesized by co-precipitation. The crystal structure and chemica...

    A. S. Nizamutdinov, E. I. Madirov, E. V. Lukinova… in Journal of Applied Spectroscopy (2020)

  4. No Access

    Article

    Luminescence of GdF3:Pr:Yb and YF3:Pr:Yb Solid Solutions Synthesized by Crystallization from the Melt

    Spectral and luminescence characteristics of GdF3:Pr:Yb and YF3:Pr:Yb solid solutions synthesized by crystallization from the melt were investigated. Down-conversion luminescence of Yb3+ in the region of 2F5/2 →

    A. S. Nizamutdinov, S. V. Kuznetsov, V. A. Konyushkin… in Journal of Applied Spectroscopy (2019)

  5. No Access

    Article

    Synthesis and Luminescence of Sr1– x – yYbxEuyF2+ x + y Solid Solutions for Photonics

    Single-phase Sr1– x – yYbxEuyF2+ x + y solid solutions with an average particle size near 90 nm have been synthesized via co-precipitation from aqueous solutions, followed by high-temperature annealing. Efficient...

    S. V. Kuznetsov, A. S. Nizamutdinov, V. Yu. Proydakova… in Inorganic Materials (2019)

  6. No Access

    Article

    Investigation of Ce3+ Impurity Centers in UV Active Media Ce:LiCaAlF6 and Ce:LiSr0.8Ca0.2AlF6

    Fluoride crystals with the colquiriite structure LiCaAlF6 doped with Ce3+ ions are used as active media for lasers of ultraviolet spectral range with advantages of laser wavelength tuning range and no photoinduce...

    A. A. Shavelev, A. S. Nizamutdinov, V. V. Semashko… in Physics of the Solid State (2019)