18 research outputs found
Peculiarities of the influenza viruses circulation and their properties during 2018-2019 epidemic season in Russia and countries of the Northern Hemisphere
Objective. To identify the drift variability of influenza viruses during the period of epidemic rise in the incidence of acute respiratory viral infections in the period 2018-2019. The biological and molecular-genetic properties of epidemic strains isolated in certain territories of the Russian Federation were studied and compared with data from the countries of the Northern Hemisphere. Materials and methods. A range of laboratory diagnostic methods has been applied, including immune fluorescence, RT-PCR, sequencing, methods for determining sensitivity to influenza drugs and receptor specificity. Results and discussion. The proportion of influenza viruses was as follows: A (H1N1) pdm09 - 53 %, A (H3N2) - 46 %, B - about 1 %. Cases of severe acute respiratory infections have most often been associated with influenza A(H1N1) pdm09 virus. According to antigenic properties, isolated strains corresponded to the properties of vaccine viruses (A/Michigan/45/2015 - by 99.6 % and A/Singapore INFIMH-16-0019/2016 - by 86 %). The heterogeneity of influenza A virus strains population was revealed as regards individual mutations in hemaglutinin. The influenza B virus population was equally represented by both evolutionary lines (B/Victoria and B/Yamagata-like). Receptor specificity was favorable for the course and outcome of the disease. Among 70 studied epidemic strains, no strains resistant to anti-neuraminidase drugs, oseltamivir and zanamivir, were detected. The article presents WHO recommendations on the composition of influenza vaccines for the countries of the Northern Hemisphere for 2019-2020, provides data on cases of human infection with avian influenza viruses A(H5N1), A(H5N6), A(H7N9) and A(H9N2)
ΠΡΠΈΠΏΠΏ-2016: ΠΊΠ»ΠΈΠ½ΠΈΠΊΠΎ-ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΈ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ (ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ ΠΠΠ£Π Π³ΠΎΡΠΎΠ΄Π° ΠΠΎΡΠΊΠ²Ρ Β«ΠΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½Π°Ρ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠ°Ρ Π±ΠΎΠ»ΡΠ½ΠΈΡΠ° β 1 ΠΠ΅ΠΏΠ°ΡΡΠ°ΠΌΠ΅Π½ΡΠ° Π·Π΄ΡΠ°Π²ΠΎΠΎΡ ΡΠ°Π½Π΅Π½ΠΈΡ Π³ΠΎΡΠΎΠ΄Π° ΠΠΎΡΠΊΠ²ΡΒ»)
The aim of this study was to monitor in-hospital influenza virus infection during 2015 β 2016 epidemic flu season. Methods. Influenza virus was searched in patients hospitalized to a clinical infectious diseases hospital with acute respiratory viral infection during 2015 β 2016 influenza seasonal growth period using real-time RT-PCR method. Influenza virus was isolated from nasal swabs and autopsy material using canine kidney cell line. Other laboratory methods used included complete blood count, blood chemistry, blood gas analysis, urinalysis, and chest X-ray examination. Results. We examined 1,491 patients (375 adults, 546 children, 570 pregnant women with early gestational age). The proportion of hospitalized patients with confirmed A / H1N1pdm09 influenza in January β February, 2016, was 91.3%. A / H3N2 influenza virus was diagnosed in 5.7%, influenza B virus was isolated in 1.2% of patients. Totally, influenza virus was detected in 35.2% of samples, of which 30.1% of samples were obtained from adults, 33.7% of samples were obtained from children, and 39.8% of samples were obtained from pregnant women. The prevalent patientβs age was 15 to 60 years (76.1%) in adults and 3 to 6 years in children. Moderate course of influenza with a high rate of hospital admission was seen more often and was similar to that of 2009 β 2010 epidemic season. Proportion of patients with flu complicated by pneumonia was higher than that in 2014 β 2015 epidemic season. Bilateral lung injury was diagnosed in 48.4% of patients. High mortality in ICU (46.4%) was due to delayed start of antiviral treatment and late admission to a hospital. Conclusion. In 2015 β 2016 epidemic flu season, higher morbidity, complications and poor outcomes were related to predominant infection of A β H1N1pdm09 influenza virus. Risk factors of complications and death were delayed care seeking, lack of modern antiviral medications and comorbidity.ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ. Π ΠΏΠ΅ΡΠΈΠΎΠ΄ ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΠΈ Π² ΡΠ΅Π·ΠΎΠ½Π΅ 2015β2016 Π³Π³. Π² ΡΠ°ΠΌΠΊΠ°Ρ
ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π½Π°Π΄Π·ΠΎΡΠ° Π·Π° ΡΠΈΡΠΊΡΠ»ΡΡΠΈΠ΅ΠΉ Π²ΠΈΡΡΡΠΎΠ² Π³ΡΠΈΠΏΠΏΠ° Π² Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ Π¦Π΅Π½ΡΡΠΎΠΌ ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ Π³ΡΠΈΠΏΠΏΠ° (Π¦ΠΠΠ) ΠΠ½ΡΡΠΈΡΡΡΠ° Π²ΠΈΡΡΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈΠΌ. Π.Π.ΠΠ²Π°Π½ΠΎΠ²ΡΠΊΠΎΠ³ΠΎ Π€ΠΠΠ£ Β«Π€Π΅Π΄Π΅ΡΠ°Π»ΡΠ½ΡΠΉ Π½Π°ΡΡΠ½ΠΎ-ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΡΠΊΠΈΠΉ ΡΠ΅Π½ΡΡ ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ ΠΌΠΈΠΊΡΠΎΠ±ΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈΠΌΠ΅Π½ΠΈ ΠΏΠΎΡΠ΅ΡΠ½ΠΎΠ³ΠΎ Π°ΠΊΠ°Π΄Π΅ΠΌΠΈΠΊΠ° Π.Π€.ΠΠ°ΠΌΠ°Π»Π΅ΠΈΒ» ΠΠΈΠ½Π·Π΄ΡΠ°Π²Π° Π ΠΎΡΡΠΈΠΈ (ΠΠΎΡΠΊΠ²Π°) Π½Π° Π±Π°Π·Π΅ ΠΠΠ£Π Π³ΠΎΡΠΎΠ΄Π° ΠΠΎΡΠΊΠ²Ρ Β«ΠΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½Π°Ρ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠ°Ρ Π±ΠΎΠ»ΡΠ½ΠΈΡΠ° β 1 ΠΠ΅ΠΏΠ°ΡΡΠ°ΠΌΠ΅Π½ΡΠ° Π·Π΄ΡΠ°Π²ΠΎΠΎΡ
ΡΠ°Π½Π΅Π½ΠΈΡ Π³ΠΎΡΠΎΠ΄Π° ΠΠΎΡΠΊΠ²ΡΒ» (ΠΠΠ£Π Π³. ΠΠΎΡΠΊΠ²Ρ Β«ΠΠΠ β 1 ΠΠΠΒ») ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΠ»ΡΡ Π³ΠΎΡΠΏΠΈΡΠ°Π»ΡΠ½ΡΠΉ ΠΌΠΎΠ½ΠΈΡΠΎΡΠΈΠ½Π³ Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΡΠΏΠ΅ΡΠΈΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ°, ΡΠ΅Π»ΡΡ ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΠΈ ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΡΠ°ΠΌΠΌΠΎΠ² Π²ΠΈΡΡΡΠΎΠ² Π³ΡΠΈΠΏΠΏΠ° Π ΠΈ Π ΡΡΠ΅Π΄ΠΈ Π³ΠΎΡΠΏΠΈΡΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ², Π² Ρ. Ρ. Ρ ΡΡΠΆΠ΅Π»ΠΎΠΉ ΡΠΎΡΠΌΠΎΠΉ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ Π°Π½Π°Π»ΠΈΠ· ΡΠ°ΡΡΠΎΡΡ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ. ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. Π ΠΏΠ΅ΡΠΈΠΎΠ΄ ΠΏΠΎΠ΄ΡΠ΅ΠΌΠ° Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΠΈ Π³ΡΠΈΠΏΠΏΠΎΠΌ Π² ΠΠΠ£Π Π³. ΠΠΎΡΠΊΠ²Ρ Β«ΠΠΠ β 1 ΠΠΠΒ» Π³ΠΎΡΠΏΠΈΡΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ Ρ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌ Π΄ΠΈΠ°Π³Π½ΠΎΠ·ΠΎΠΌ ΠΎΡΡΡΠ°Ρ ΡΠ΅ΡΠΏΠΈΡΠ°ΡΠΎΡΠ½Π°Ρ Π²ΠΈΡΡΡΠ½Π°Ρ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΡ. ΠΠ΅ΡΠ΅ΠΊΡΠΈΡ Π²ΠΈΡΡΡΠΎΠ² Π³ΡΠΈΠΏΠΏΠ° ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»Π°ΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ°Π·Π½ΠΎΠΉΒ ΡΠ΅ΠΏΠ½ΠΎΠΉΒ ΡΠ΅Π°ΠΊΡΠΈΠΈΒ Ρ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠΉ ΡΡΠ°Π½ΡΠΊΡΠΈΠΏΡΠΈΠ΅ΠΉ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΠ΅Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ. ΠΠΈΡΡΡΡ Π³ΡΠΈΠΏΠΏΠ° Π±ΡΠ»ΠΈ ΠΈΠ·ΠΎΠ»ΠΈΡΠΎΠ²Π°Π½Ρ ΠΈΠ· Π½Π°Π·Π°Π»ΡΠ½ΡΡ
ΡΠΌΡΠ²ΠΎΠ² ΠΈ ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π½Π° ΠΏΠ΅ΡΠ΅Π²ΠΈΠ²Π°Π΅ΠΌΠΎΠΉ ΠΊΠ»Π΅ΡΠΎΡΠ½ΠΎΠΉ Π»ΠΈΠ½ΠΈΠΈ ΠΏΠΎΡΠΊΠΈ ΡΠΎΠ±Π°ΠΊΠΈ (MDCK). ΠΠ°Π±ΠΎΡΠ°ΡΠΎΡΠ½Π°Ρ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ° Π²ΠΊΠ»ΡΡΠ°Π»Π° ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈ Π±ΠΈΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΊΡΠΎΠ²ΠΈ, Π°Π½Π°Π»ΠΈΠ· Π³Π°Π·ΠΎΠ²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΊΡΠΎΠ²ΠΈ, Π°Π½Π°Π»ΠΈΠ· ΠΌΠΎΡΠΈ, ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΡΠ³Π°Π½ΠΎΠ² Π³ΡΡΠ΄Π½ΠΎΠΉ ΠΊΠ»Π΅ΡΠΊΠΈ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π ΡΠ½Π²Π°ΡΠ΅-ΡΠ΅Π²ΡΠ°Π»Π΅ 2016 Π³. Π΄ΠΎΠ»Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
, Π³ΠΎΡΠΏΠΈΡΠ°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
Π² ΠΠΠ£Π Π³. ΠΠΎΡΠΊΠ²Ρ Β«ΠΠΠ β 1 ΠΠΠΒ» Ρ Π»Π°Π±ΠΎΡΠ°ΡΠΎΡΠ½ΠΎ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π΅Π½Π½ΡΠΌ Π³ΡΠΈΠΏΠΏΠΎΠΌ A / H1N1pdm09, ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 91,3 %, A / H3N2 β 5,7 %, Π β 1,2 %. ΠΠ±ΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ (n = 1Β 491) β Π²Π·ΡΠΎΡΠ»ΡΠ΅ (n = 375), Π΄Π΅ΡΠΈ (n = 546) ΠΈ Π±Π΅ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ (n = 570) Π½Π° ΡΠ°Π·Π½ΡΡ
ΡΡΠΎΠΊΠ°Ρ
. ΠΠΎΠ»Ρ ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π½Π° Π³ΡΠΈΠΏΠΏ ΠΏΡΠΎΠ± Π² ΡΠ΅Π»ΠΎΠΌ ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 35,2 %. Π‘ΡΠ΅Π΄ΠΈ Π²Π·ΡΠΎΡΠ»ΡΡ
ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠΌΠΈ Π½Π° Π³ΡΠΈΠΏΠΏ Π±ΡΠ»ΠΈ 30,1 % ΠΏΡΠΎΠ±, ΡΡΠ΅Π΄ΠΈ Π΄Π΅ΡΠ΅ΠΉ β 33,7 %, ΡΡΠ΅Π΄ΠΈ Π±Π΅ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
β 39,8 %. Π Π²ΠΎΠ·ΡΠ°ΡΡΠ½ΠΎΠΉ ΡΡΡΡΠΊΡΡΡΠ΅ ΠΏΡΠ΅ΠΎΠ±Π»Π°Π΄Π°Π»ΠΈ (76,1 %) ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ Π² Π²ΠΎΠ·ΡΠ°ΡΡΠ΅ ΠΎΡ 15 Π΄ΠΎ 50 Π»Π΅Ρ. Π Π΄Π΅ΡΡΠΊΠΎΠΉ ΠΏΠΎΠΏΡΠ»ΡΡΠΈΠΈ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²ΠΎΠ²Π»Π΅ΡΠ΅Π½Π½ΡΠΌΠΈ Π² ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΡ ΠΎΠΊΠ°Π·Π°Π»ΠΈΡΡ Π΄Π΅ΡΠΈ Π² Π²ΠΎΠ·ΡΠ°ΡΡΠ΅ 3β6 Π»Π΅Ρ. ΠΡΠ΅ΠΎΠ±Π»Π°Π΄Π°Π»ΠΈ ΡΡΠ΅Π΄Π½Π΅ΡΡΠΆΠ΅Π»ΡΠ΅ ΡΠΎΡΠΌΡ Π³ΡΠΈΠΏΠΏΠ° Ρ Π²ΡΡΠΎΠΊΠΎΠΉ ΡΠ°ΡΡΠΎΡΠΎΠΉ Π³ΠΎΡΠΏΠΈΡΠ°Π»ΠΈΠ·Π°ΡΠΈΠΉ, ΡΡΠ°Π²Π½ΠΈΠΌΠΎΠΉ Ρ ΡΠ΅Π·ΠΎΠ½ΠΎΠΌ 2009β2010 Π³Π³. ΠΠΎΠ»Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ Π³ΡΠΈΠΏΠΏΠΎΠΌ, ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½Π½ΡΠΌ ΠΏΠ½Π΅Π²ΠΌΠΎΠ½ΠΈΠ΅ΠΉ, ΡΠ²Π΅Π»ΠΈΡΠΈΠ»Π°ΡΡ Π² ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΈ Ρ ΡΠΏΠΈΠ΄Π΅ΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ΅Π·ΠΎΠ½ΠΎΠΌ 2014β2015 Π³Π³. ΠΠ²ΡΡΡΠΎΡΠΎΠ½Π½Π΅Π΅ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ Π»Π΅Π³ΠΊΠΈΡ
Π·Π°ΡΠ΅Π³ΠΈΡΡΡΠΈΡΠΎΠ²Π°Π½ΠΎ Ρ 48,4 % Π±ΠΎΠ»ΡΠ½ΡΡ
. ΠΡΡΠΎΠΊΠΈΠΉ ΡΡΠΎΠ²Π΅Π½Ρ Π»Π΅ΡΠ°Π»ΡΠ½ΠΎΡΡΠΈ (46,4 %) Π² ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΈΠΈ ΠΈ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΡΠ²ΡΠ·Π°Π½ Ρ Π·Π°ΠΏΠΎΠ·Π΄Π°Π»ΡΠΌ Π½Π°ΡΠ°Π»ΠΎΠΌ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΈ ΠΏΠΎΠ·Π΄Π½Π΅ΠΉ Π³ΠΎΡΠΏΠΈΡΠ°Π»ΠΈΠ·Π°ΡΠΈΠ΅ΠΉ. ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΡΡΠΎΠΊΠ°Ρ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΡ, ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΡΠΈΡΠ»Π° ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΈ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΡΡ
ΠΈΡΡ
ΠΎΠ΄ΠΎΠ² ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π° Π΄ΠΎΠΌΠΈΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π²ΠΈΡΡΡΠ° Π³ΡΠΈΠΏΠΏΠ° A / H1N1pdm09. Π€Π°ΠΊΡΠΎΡΠ°ΠΌΠΈ, ΡΠ²Π΅Π»ΠΈΡΠΈΠ²Π°ΡΡΠΈΠΌΠΈ ΡΠΈΡΠΊ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΈ Π»Π΅ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡ
ΠΎΠ΄ΠΎΠ², ΡΠ²Π»ΡΡΡΡΡ ΠΏΠΎΠ·Π΄Π½Π΅Π΅ ΠΎΠ±ΡΠ°ΡΠ΅Π½ΠΈΠ΅ Π·Π° ΠΌΠ΅Π΄ΠΈΡΠΈΠ½ΡΠΊΠΎΠΉ ΠΏΠΎΠΌΠΎΡΡΡ, ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ ΡΠ²ΠΎΠ΅Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΏΡΠΎΡΠΈΠ²ΠΎΠ²ΠΈΡΡΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ, ΡΠΎΠΏΡΡΡΡΠ²ΡΡΡΠΈΠ΅ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ
Change in Absorption Induced in a Bi12TiO20: Ca Crystal by 870-nm Infrared Radiation
This work was supported by the Russian Foundation
for Basic Research, project nos. 06-02-81040-Bel-a
and 05-02-16589-a; the Belorussian Foundation for
Basic Research, project no. F06R-200; and the 2006β
2008 program βDevelopment of the Scientific Potential
of the Higher School.
Change in Absorption Induced in a Bi12TiO20: Ca Crystal by 870-nm Infrared Radiation
This work was supported by the Russian Foundation
for Basic Research, project nos. 06-02-81040-Bel-a
and 05-02-16589-a; the Belorussian Foundation for
Basic Research, project no. F06R-200; and the 2006β
2008 program βDevelopment of the Scientific Potential
of the Higher School.
Dynamics of light-absorption variations induced in a bismuth silicate crystal by visible laser illumination
We present the results of experimental studies of the dynamics of the photoinduced optical absorption in a bismuth silicate crystal subject to continuous laser irradiation with wavelengths of 532 and 655 nm. The semiconductor-laser light beam with the wavelength Ξ» = 655 nm causes the crystal bleaching at this wavelength, whereas its exposure to a shorter-wavelength irradiation from the optical-spectrum green region with a wavelength of 532 nm increases the optical absorption at both wavelengths, of 532 and 655 nm. The experimental results are interpreted using the theoretical model which assumes that the crystal has deep defect centers of two types so that an electron at each of these centers can be in one of the states characterized by different photoionization cross sections
Πynamics of light-absorption variations induced in a bismuth silicate crystal by visible laser illumination
We present the results of experimental studies of the dynamics of the photoinduced optical absorption
in a bismuth silicate crystal subject to continuous laser irradiation with wavelengths of
532 and 655 nm. The semiconductor-laser light beam with the wavelength Ξ» = 655 nm causes
the crystal bleaching at this wavelength, whereas its exposure to a shorter-wavelength irradiation
from the optical-spectrum green region with a wavelength of 532 nm increases the optical
absorption at both wavelengths, of 532 and 655 nm. The experimental results are interpreted
using the theoretical model which assumes that the crystal has deep defect centers of two types
so that an electron at each of these centers can be in one of the states characterized by different
photoionization cross sections
Πynamics of light-absorption variations induced in a bismuth silicate crystal by visible laser illumination
We present the results of experimental studies of the dynamics of the photoinduced optical absorption
in a bismuth silicate crystal subject to continuous laser irradiation with wavelengths of
532 and 655 nm. The semiconductor-laser light beam with the wavelength Ξ» = 655 nm causes
the crystal bleaching at this wavelength, whereas its exposure to a shorter-wavelength irradiation
from the optical-spectrum green region with a wavelength of 532 nm increases the optical
absorption at both wavelengths, of 532 and 655 nm. The experimental results are interpreted
using the theoretical model which assumes that the crystal has deep defect centers of two types
so that an electron at each of these centers can be in one of the states characterized by different
photoionization cross sections
Dynamics of Light-Absorption Variations Induced in a Bismuth Silicate Crystal by Visible Laser Illumination
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 57, No. 8β9, pp. 660β665, AugustβSeptember 2014.We present the results of experimental studies of the dynamics of the photoinduced optical absorption in a bismuth silicate crystal subject to continuous laser irradiation with wavelengths of 532 and 655 nm. The semiconductor-laser light beam with the wavelength Ξ» = 655 nm causes the crystal bleaching at this wavelength, whereas its exposure to a shorter-wavelength irradiation from the optical-spectrum green region with a wavelength of 532 nm increases the optical absorption at both wavelengths, of 532 and 655 nm. The experimental results are interpreted using the theoretical model which assumes that the crystal has deep defect centers of two types so that an electron at each of these centers can be in one of the states characterized by different photoionization cross sections