Alterations of gut bacteria Akkermansia muciniphila and Faecalibacterium prausnitzii in late post-transplant period after liver transplantation

Autor: Alexander Kukov, Milena Peruhova, Atanas Syarov, Iskra Altankova, Nonka Yurukova, Andrei Goncharov, Radoslava Vazharova, Anoaneta Mihova, Tsvetelina Velikova, Yordanka Uzunova

Publikováno v: Iberoamerican Journal of Medicine, Vol 4, Iss 1, Pp 45-51 (2022)

Introduction: Recent studies have shown that the intestinal microbiota can modulate certain systemic metabolic and immune responses, including liver graft function and the development of complications in patients after liver transplantation (LT). Akk

Externí odkaz: https://doaj.org/article/4f4ed353a14741ac816b6b8d85651ff9

457-nm radiation source based on a diode laser for precision spectroscopy of magnesium atoms

Autor: Andrei Goncharov, M. A. Tropnikov, A. E. Bonert, V. I. Baraulya

Publikováno v: Quantum Electronics. 50:272-276

We report on the development of a highly stable source of 457-nm radiation based on a diode laser and a tapered amplifier operating in a double-pass scheme. The diode laser frequency was stabilised by a high-Q reference Fabry – Perot interferometer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54b2d1f442a2154a51d379070be2f07f
https://doi.org/10.1070/qel17215

Nonlinear enhanced-absorption resonances in compact alkali-vapor cells for applications in quantum metrology

Autor: V. M. Entin, D. V. Brazhnikov, C. Andreeva, Mikhail N Skvortsov, S. Gateva, I. I. Ryabtsev, S. M. Ignatovich, I. S. Mesenzova, E. Taskova, A. M. Mikhailov, Rodolphe Boudot, Andrei Goncharov, E. Alipieva

Publikováno v: Journal of Physics: Conference Series (JPCS)
Journal of Physics: Conference Series (JPCS), 2021, 1859, pp.012019. ⟨10.1088/1742-6596/1859/1/012019⟩

We review three laser spectroscopy schemes developed recently for observation of high-contrast enhanced-absorption nonlinear resonances in small alkali-vapor cells. In our experiments, optical transitions within the cesium D1 line are involved and a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::564671da3c630dcfed13e1288f7110cf
https://hal.archives-ouvertes.fr/hal-03403169

Laser frequency stabilisation on narrow resonances of cold magnesium atoms at the 1S0 – 3P1 transition

Autor: M. A. Tropnikov, S. N. Bagayev, A. E. Bonert, A. V. Taichenachev, Andrei Goncharov, V. I. Baraulya, S. A. Kuznetsov

Publikováno v: Quantum Electronics. 48:410-414

Experimental studies aimed at developing an optical frequency standard based on ultracold magnesium atoms with a relative uncertainty of Δν/ν < 10–16 are performed. The frequency of the clock laser system at a wavelength of 457 nm is stabilised

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::02d6eaa65d4f0c1ba0e739bd164e11f5
https://doi.org/10.1070/qel16657

High-Precision Mid-Infrared Spectroscopy with a Widely Tuneable SI-Traceable Frequency-Comb-Stabilised QCL

Autor: Paul-Eric Pottie, Yann Le Coq, Haniffe Mouhamad, Dang Bao An Tran, Benoît Darquié, Michel Abgrall, R. Santagata, Anne Cournol, Mathieu Manceau, Rodolphe Le Targat, Dan Xu, Fabrice Wiotte, Oliver Lopez, Won Kiu Lee, Anne Amy-Klein, B. Argence, Sean Tokunaga, Andrei Goncharov, Louis Lecordier, H. Alvarez-Martinez

Publikováno v: Proceedings of the 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2019)
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Sep 2019, Paris, France. pp.1-2, ⟨10.1109/IRMMW-THz.2019.8874164⟩

International audience; We report measurements of absolute frequencies of various polyatomic species around 10 μm, at level of accuracies ranging from 10 Hz to 10 kHz, using a widely tuneable SI-traceable optical frequency comb-stabilized quantum ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ea6f1ce4b165d91d5fe9ad7879e2fac
https://doi.org/10.1109/irmmw-thz.2019.8874164