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  1. No Access

    Article

    Size-Dependent One- and Two-Photon Fluorescence of Acetonitrile-Derived Carbon Dots

    Carbon dots—carbonaceous luminescent nanoparticles—are increasingly employed in bioimaging, fluorescent sensing, photocatalysis, and light emitting devices. The nanoparticle size is the key morphological param...

    A. A. Astafiev, A. M. Shakhov, V. A. Nadtochenko in JETP Letters (2023)

  2. No Access

    Article

    Femtosecond Laser Microsurgery of Mouse Oocytes: Formation and Dynamics of Cavitation Bubbles Under the Action of Sharply Focused Laser Radiation on Various Oocyte Zones

    In this paper, we study the formation and dynamics of cavitation bubbles arising in different zones of preovulatory (GV) mouse oocytes as a result of optical breakdown under the action of femtosecond laser pul...

    A. A. Astafiev, A. M. Shakhov, A. A. Osychenko… in Russian Journal of Physical Chemistry B (2023)

  3. No Access

    Article

    Resonance Energy Transfer Reveals the Presence of Multiple Luminescence Emission Centers within a Carbon Nanodot

    Carbon nanodots are an emerging class of nanomaterials which exhibit visible photoluminescence, commonly attributed to luminescent organic groups within their structure. A question important for understanding ...

    A. A. Astafiev, A. M. Shakhov, V. A. Nadtochenko in JETP Letters (2022)

  4. No Access

    Article

    Enhanced Nonlinear Photoluminescence of Au–Carbon Dot Nanohybrids Produced by Photocatalytic Reduction of Au(III) Ions

    Nanohybrids composed of carbon dots and gold nanoparticles are of considerable interest for luminescence imaging, photocatalysis, luminescence sensing and nonlinear optics. We describe a method for controlled ...

    A. A. Astafiev, A. M. Shakhov, S. A. Minayeva, V. A. Nadtochenko in JETP Letters (2021)

  5. No Access

    Article

    Increasing the Fluorescence Brightness of Superphotostable EGFP Mutant by Introducing Mutations That Block Chromophore Protonation

    The design of fluorescent proteins with increased photostability is an important practical task. One of the approaches to its solution is the search for amino acid residues, which play a key role in chromophor...

    A. V. Mamontova, A. M. Shakhov, A. P. Grigoryev… in Russian Journal of Bioorganic Chemistry (2020)

  6. No Access

    Article

    Methodology for Determining the Dynamics of Development of Single Cavitation Bubbles in Aqueous Medium upon Optical Breakdown

    A. A. Astaf’ev, A. M. Shakhov, A. A. Osychenko, D. Yu. Martirosyan… in High Energy Chemistry (2020)

  7. No Access

    Article

    Femtosecond Laser Synthesis of Luminescent Carbon Dots from Toluene

    Products of reactions in toluene induced by nonlinear absorption of femtosecond laser pulses are studied. Laser synthesis of carbon dots with characteristic sizes of several nanometers and luminescence in the ...

    A. A. Astafiev, A. M. Shakhov, A. A. Vasin, Yu. V. Kostina… in JETP Letters (2019)

  8. No Access

    Article

    Physicochemical Mechanisms of Nanostructuring of Glass by Femtosecond Laser Pulses with the Use of Selective Etching

    Processes occurring at nanostructuring of glass irradiated by tightly focused single femtosecond laser pulses with selective chemical etching in the alkaline solution have been studied. Structures with a width...

    A. M. Shakhov, A. A. Astafiev, V. A. Nadtochenko in JETP Letters (2019)

  9. No Access

    Article

    Structural Features of the Nucleolus in the Mouse Germinal Vesicle Oocyte Revealed by AFM, SEM, and ToF-SIMS

    The structural organization of the biological material in the nucleoli (Nucleolus-Like Bodies (NLBs)) in mouse GV oocytes has been studied with atomic force microscopy (AFM), scanning electron microscopy (SEM)...

    A. A. Astafiev, A. A. Gulin, A. A. Osychenko, A. E. Solodina… in Nanotechnologies in Russia (2017)

  10. No Access

    Article

    Effect of femtosecond laser radiation on mammalian oocytes

    Nucleolus-like bodies (NLBs) of mammalian oocytes are a convenient object for studying the effects of laser radiation on cellular organelles during laser surgery operations. NLBs in mouse germinal vesicle oocy...

    A. M. Shakhov, A. A. Astafiev, A. A. Osychenko… in Russian Journal of Physical Chemistry B (2016)

  11. No Access

    Article

    Formation of light-absorbing centers induced in cytoplasm of mouse embryos by femtosecond pulsed near-infrared radiation

    A. A. Astaf’ev, A. D. Zalesskii, A. M. Shakhov, A. A. Osychenko… in High Energy Chemistry (2016)

  12. No Access

    Article

    Visualization of the spatial distribution of Ag ions in cyanobacteria Anabaena sp. PCC 7120 by time-of-flight secondary ion mass spectrometry and two-photon luminescence microscopy

    Cyanobacteria Anabaena sp. PCC 7120 have been analyzed by time-of-flight secondary ion mass spectrometry and two-photon luminescence microscopy. The reduction of Ag+ ions to silver nanoparticles inside the cells ...

    A. A. Gulin, O. A. Koksharova, A. A. Popova, I. A. Khmel’… in Nanotechnologies in Russia (2016)

  13. No Access

    Article

    Pulse heating of water at the surface of gold nanoparticles: Femtosecond laser spectroscopy of energy relaxation of aqueous colloid of plasmonic nanoparticles under strong excitation conditions

    The dynamics of differential absorption spectra of gold nanoparticles has been studied by femtosecond laser spectroscopy over a wide range of excitation energy density. The position of the plasmon resonance pe...

    A. V. Aibush, A. A. Astaf’ev, F. E. Gostev, N. N. Denisov… in High Energy Chemistry (2015)