35 research outputs found
Kinetic regularities, catalyst deactivation and reactivation
Funding text 1 The research is funded from Ministry of Education and Science of the Russian Federation Program No. 075β03β2021β287/6 (Russia). Funding text 2 XPS measurements were carried out at the Central laboratories of Tomsk Polytechnic University (Analytical Center). HRTEM was carried out at the Innovation centre for Nanomaterials and Nanotechnologies of Tomsk Polytechnic University. The ICP-OES analysis was carried out using the core facilities of βPhysics and Chemical methods of analysisβ of Tomsk Polytechnic University. Fundação para a CiΓͺncia e a Tecnologia for Scientific Employment Stimulus Institutional Call (CEECINST/00102/2018), UIDB/50006/2020 and UIDP/50006/2020 (LAQV), UIDB/00100/2020 and UIDP/00100/2020 (Centro de QuΓmica Estrutural).Betulin, being a pentacyclic triterpene alcohol and an extractive from birch bark, along with its oxo-derivatives, has a broad range of physiological properties of interest for synthesis of pharmaceuticals. Instead of oxidizing betulin with strong and toxic oxidizing agents the present study shows a possibility of using liquid-phase oxidation of betulin with air over supported Ag NPs catalysts as an alternative method for synthesis of its oxo-derivatives. Based on catalytic studies, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy, the evolution of the surface of nanosilver catalysts during the catalysis was demonstrated, as well as under the impact of reactant gas composition. The kinetic regularities and causes of deactivation of supported Ag NPs catalysts were revealed. An approach to the regeneration of silver catalysts was proposed. Kinetic analysis with numerical data fitting was performed resulting in an adequate description of the concentration dependencies.publishersversionpublishe
ΠΠΊΡΠΈΠ²Π°ΡΠΈΡ Π°ΡΡΠΎΡΠ°Π³ΠΈΠΈ Π² ΠΊΠ»Π΅ΡΠΊΠ°Ρ ΡΠ°ΠΊΠ° ΠΌΠΎΠ»ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ in vitro ΠΏΠΎΡΠ»Π΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΠ°ΠΌΠΈ PI3K/AKT/mTOR
Introduction. Current chemotherapy of breast cancer has a wide range of disadvantages, in particular, the development of therapy-related infections and hormonal imbalance. Combination of main cytostatic with glucocorticoids allows to broaden its therapeutic interval and to decrease the total toxicity of the treatment. However, long-term treatment with glucocorticoids leads to the development of severe side effects via activation of multiple molecular mechanisms. Thus, glucocorticoids activate prosurvival mTOR-dependent autophagy. Therefore, the evaluation of PI3K (phosphoinositide 3-kinases) / Akt (protein kinase B) / mTOR (mammalian target of rapamycin) inhibitors as adjuvants for breast cancer therapy is important for optimization of treatment protocol.Aim. Analysis of the effects of PI3K/Akt/mTOR inhibitors, rapamycin, wortmannin and LY-294002 in combination with glucocorticoids in breast cancer cell lines of different subtypes.Materials and methods. We demonstrated the inhibition of PI3K/Akt/mTOR signaling and the autophagy induction after the treatment of breast cancer cells with rapamycin, wortmannin and LY-294002 by Western blotting analysis of Beclin-1, phospho-Beclin-1 (Ser93 and Ser30).Conclusion. PI3K/Akt/mTOR inhibitors in combination with Dexamethasone cooperatively inhibited mTOR signaling and activated autophagy in breast cancer cells in vitro.ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅. Π₯ΠΈΠΌΠΈΠΎΡΠ΅ΡΠ°ΠΏΠΈΡ ΡΠ°ΠΊΠ° ΠΌΠΎΠ»ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ ΠΈΠΌΠ΅Π΅Ρ ΡΠΈΡΠΎΠΊΠΈΠΉ ΡΠΏΠ΅ΠΊΡΡ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠ², Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΠ΅ ΡΠΎΠΏΡΡΡΡΠ²ΡΡΡΠΈΡ
ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΉ ΠΈ Π³ΠΎΡΠΌΠΎΠ½Π°Π»ΡΠ½ΡΡ
Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ. ΠΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΡ Ρ ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π³Π»ΡΠΊΠΎΠΊΠΎΡΡΠΈΠΊΠΎΠΈΠ΄Π°ΠΌΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΡΠ°ΡΡΠΈΡΠΈΡΡ ΡΠ΅ΡΠ°ΠΏΠ΅Π²ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» ΠΈ ΡΠ½ΠΈΠ·ΠΈΡΡ ΠΎΠ±ΡΡΡ ΡΠΎΠΊΡΠΈΡΠ½ΠΎΡΡΡ ΠΏΡΠ΅ΠΏΠ°ΡΠ°ΡΠΎΠ² ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠΉ Π»ΠΈΠ½ΠΈΠΈ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ. ΠΠ΄Π½Π°ΠΊΠΎ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ΅ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π³Π»ΡΠΊΠΎΠΊΠΎΡΡΠΈΠΊΠΎΠΈΠ΄ΠΎΠ² ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΠ΅Ρ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΡΠ΄Π° ΠΏΠΎΠ±ΠΎΡΠ½ΡΡ
ΡΡΡΠ΅ΠΊΡΠΎΠ², ΠΊΠΎΡΠΎΡΡΠ΅ ΠΌΠΎΠ³ΡΡ ΡΠ΅Π°Π»ΠΈΠ·ΠΎΠ²ΡΠ²Π°ΡΡΡΡ Π·Π° ΡΡΠ΅Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΡ
ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠΎΠ². Π’Π°ΠΊ, Π³Π»ΡΠΊΠΎΠΊΠΎΡΡΠΈΠΊΠΎΠΈΠ΄Ρ ΠΌΠΎΠ³ΡΡ ΠΈΠ½ΠΈΡΠΈΠΈΡΠΎΠ²Π°ΡΡ ΠΈΠ½Π΄ΡΠΊΡΠΈΡ Π°ΡΡΠΎΡΠ°Π³ΠΈΠΈ, Π²Π΅Π΄ΡΡΡΡ ΠΊ Π²ΡΠΆΠΈΠ²Π°Π½ΠΈΡ ΠΎΠΏΡΡ
ΠΎΠ»Π΅Π²ΡΡ
ΠΊΠ»Π΅ΡΠΎΠΊ. ΠΠ°ΠΏΡΡΠΊ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠ° Π°ΡΡΠΎΡΠ°Π³ΠΈΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ mTOR-Π·Π°Π²ΠΈΡΠΈΠΌΡΠΌ, Π² ΡΠ²ΡΠ·ΠΈ Ρ ΡΠ΅ΠΌ Π°ΠΊΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΡΠ΅Π½ΠΊΠ° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ Π²Π²Π΅Π΄Π΅Π½ΠΈΡ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π°Π΄ΡΡΠ²Π°Π½ΡΠΎΠ² Π² ΡΠ΅ΡΠ°ΠΏΠΈΡ ΡΠ°ΠΊΠ° ΠΌΠΎΠ»ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΠΎΠ² ΡΠΈΠ³Π½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΡΠΈ PI3K (ΡΠΎΡΡΠΎΠΈΠ½ΠΎΠ·ΠΈΡΠΈΠ΄-3βΠΊΠΈΠ½Π°Π·Π°) / Akt (ΠΏΡΠΎΡΠ΅ΠΈΠ½ΠΊΠΈΠ½Π°Π·Π° B) / mTOR (ΠΌΠΈΡΠ΅Π½Ρ ΡΠ°ΠΏΠ°ΠΌΠΈΡΠΈΠ½Π° ΠΌΠ»Π΅ΠΊΠΎΠΏΠΈΡΠ°ΡΡΠΈΡ
).Π¦Π΅Π»Ρ ΡΠ°Π±ΠΎΡΡ β Π°Π½Π°Π»ΠΈΠ· Π΄Π΅ΠΉΡΡΠ²ΠΈΡ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΠΎΠ² PI3K / Akt / mTOR ΡΠ°ΠΏΠ°ΠΌΠΈΡΠΈΠ½Π°, Π²ΠΎΡΡΠΌΠ°Π½Π½ΠΈΠ½Π° ΠΈ LY-294002 Π² ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ Ρ Π³Π»ΡΠΊΠΎΠΊΠΎΡΡΠΈΠΊΠΎΠΈΠ΄Π°ΠΌΠΈ Π½Π° Π·Π°ΠΏΡΡΠΊ Π°ΡΡΠΎΡΠ°Π³ΠΈΠΈ Π² ΠΊΠ»Π΅ΡΠΎΡΠ½ΡΡ
Π»ΠΈΠ½ΠΈΡΡ
ΡΠ°ΠΊΠ° ΠΌΠΎΠ»ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠ³ΠΎ Π³ΠΈΡΡΠΎΠ³Π΅Π½Π΅Π·Π°.ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΠ΅ΡΡΠ΅ΡΠ½-Π±Π»ΠΎΡΡΠΈΠ½Π³Π° Π±ΡΠ»ΠΎ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΠ°ΠΏΠ°ΠΌΠΈΡΠΈΠ½, Π²ΠΎΡΡΠΌΠ°Π½Π½ΠΈΠ½ ΠΈ LY-294002 ΠΈΠ½Π³ΠΈΠ±ΠΈΡΡΡΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΠΈΠ³Π½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΡΠΈ PI3K / Akt / mTOR ΠΈ ΠΈΠ½Π΄ΡΡΠΈΡΡΡΡ Π°ΡΡΠΎΡΠ°Π³ΠΈΡ Π² ΠΊΠ»Π΅ΡΠΊΠ°Ρ
ΡΠ°ΠΊΠ° ΠΌΠΎΠ»ΠΎΡΠ½ΠΎΠΉ ΠΆΠ΅Π»Π΅Π·Ρ, ΠΎ ΡΠ΅ΠΌ ΡΡΠ΄ΠΈΠ»ΠΈ ΠΏΠΎ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΡΠΎΠ²Π½Ρ ΠΊΠ»ΡΡΠ΅Π²ΠΎΠ³ΠΎ Π±Π΅Π»ΠΊΠ° ΠΌΠ°ΠΊΡΠΎΠ°ΡΡΠΎΡΠ°Π³ΠΈΠΈ, Beclin-1, ΠΈ Π΅Π³ΠΎ ΡΠΎΡΡΠΎΡΠΈΠ»ΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΡΠΎΡΠΌ phospho-Beclin-1 ΠΏΠΎ ΠΎΡΡΠ°ΡΠΊΠ°ΠΌ ΡΠ΅ΡΠΈΠ½Π° Ser93 ΠΈ Ser30.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. Π Ρ
ΠΎΠ΄Π΅ ΡΠ°Π±ΠΎΡΡ Π±ΡΠ»ΠΎ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΈΠ½Π³ΠΈΠ±ΠΈΡΠΎΡΡ ΡΠΈΠ³Π½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΡΠΈ PI3K / Akt / mTOR Π² ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ Ρ Π΄Π΅ΠΊΡΠ°ΠΌΠ΅ΡΠ°Π·ΠΎΠ½ΠΎΠΌ ΠΊΠΎΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎ ΠΏΠΎΠ΄Π°Π²Π»ΡΡΡ ΡΠΈΠ³Π½Π°Π»ΡΠ½ΡΠΉ ΠΏΡΡΡ mTOR ΠΈ Π°ΠΊΡΠΈΠ²ΠΈΡΡΡΡ Π°ΡΡΠΎΡΠ°Π³ΠΈΡ Π² ΠΊΠ»Π΅ΡΠΊΠ°Ρ
Π ΠΠ in vitro
Π€Π°ΠΊΡΠΎΡΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ²Π΅ΡΡ Π½ΠΎΡΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΈΡΠΎΠΊΠ° ΠΊ ΠΎΠ·Π΅ΡΠ°ΠΌ Π°Π½ΡΠ°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠ°Π·ΠΈΡΠ° Π₯ΠΎΠ»ΠΌΡ ΠΠ°ΡΡΠ΅ΠΌΠ°Π½Π½
The study aims to identify formation factors of water inflow to the Antarctic lakes of the Larsemann Hills oasis (East Antarctica). The objects of study are 11 lakes of the oasis. The analysis was performed based on the expeditionary data of the Russian Antarctic Expedition (RAE): 63rd season (23 December 2017 β 3 February 2018), 64th season (12 January 2019 β 27 February 2019), 65th season (2 November 2019 β 24 March 2020). Data of lakes water level observations, aerial photography of the unmanned aerial vehicle (UAV) and route surveys are given, the results of identifying the boundaries of the lakes catchments are presented. The factors that determine the formation of water inflow to the lakes in this region were identified based on the analysis of the materials. The most significant are the meteorological conditions, the presence of perennial snowfields and glacial areas in the catchments, and the presence of lakes that can cause outburst flood. The seasonally thawed layer also has an impact on the formation of the inflow to the lakes. The vegetation cover is not so important for inflow formation in this region due to the physical and geographical conditions. As for anthropogenic activity, it mainly affects the environmental situation of the catchments and water quality, while the anthropogenic influence on the formation of water inflow to the lakes in the oasis is limited to the territories of polar stations. The factors identified should be taken into account in the further study of hydrological processes, the creation of models that describe them, and the organization of field observations.ΠΠ±ΡΠ΅ΠΊΡΠ°ΠΌΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²Π»ΡΡΡΡΡ 11 Π²ΠΎΠ΄ΠΎΠ΅ΠΌΠΎΠ² Π°Π½ΡΠ°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΎΠ°Π·ΠΈΡΠ° Π₯ΠΎΠ»ΠΌΡ ΠΠ°ΡΡΠ΅ΠΌΠ°Π½Π½. Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°ΠΌ ΡΠ΅Π·ΠΎΠ½Π½ΡΡ
ΡΠ°Π±ΠΎΡ 63 β 65-ΠΉ Π ΠΠ: ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΡΡ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ Π·Π° ΡΡΠΎΠ²Π½Π΅ΠΌ Π²ΠΎΠ΄Ρ ΠΎΠ·Π΅Ρ, Π°ΡΡΠΎΡΠΎΡΠΎΡΡΠ΅ΠΌΠΊΠΈ ΠΠΠΠ, ΠΌΠ°ΡΡΡΡΡΠ½ΡΠ΅ ΠΎΠ±ΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ, ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ Π³ΡΠ°Π½ΠΈΡ Π²ΠΎΠ΄ΠΎΡΠ±ΠΎΡΠ½ΡΡ
ΠΏΠ»ΠΎΡΠ°Π΄Π΅ΠΉ ΠΎΠ·Π΅Ρ. ΠΠ°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π·Π½Π°ΡΠΈΠΌΡΠΌΠΈ Π²ΡΡΠ²Π»Π΅Π½Π½ΡΠΌΠΈ ΡΠ°ΠΊΡΠΎΡΠ°ΠΌΠΈ, ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΡΡΠΈΠΌΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΈΡΠΎΠΊΠ° Π²ΠΎΠ΄Ρ ΠΊ ΠΎΠ·Π΅ΡΠ°ΠΌ, ΡΠ²Π»ΡΡΡΡΡ ΠΌΠ΅ΡΠ΅ΠΎΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΡΠ»ΠΎΠ²ΠΈΡ (ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΡΠ²Π΅ΡΠ΄ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ², Π²Π΅ΡΡΠΎΠ²ΠΎΠΉ ΡΠ΅ΠΆΠΈΠΌ, ΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ° Π²ΠΎΠ·Π΄ΡΡ
Π°), Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΌΠ½ΠΎΠ³ΠΎΠ»Π΅ΡΠ½ΠΈΡ
ΡΠ½Π΅ΠΆΠ½ΠΈΠΊΠΎΠ² ΠΈ Π»Π΅Π΄Π½ΠΈΠΊΠΎΠ²ΡΡ
ΡΡΠ°ΡΡΠΊΠΎΠ² Π½Π° Π²ΠΎΠ΄ΠΎΡΠ±ΠΎΡΠ°Ρ
, ΠΏΡΠΎΡΡΠ² Π²Π΅ΡΡ
Π½Π΅Π³ΠΎ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ ΠΎΠ·Π΅ΡΠ°. Π‘Π΅Π·ΠΎΠ½Π½ΠΎ-ΡΠ°Π»ΡΠΉ ΡΠ»ΠΎΠΉ ΡΡΡ
Π»ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ΅Π½ΠΈΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΡΠ΅Ρ ΡΠΊΠ»ΠΎΠ½ΠΎΠ²ΡΠΉ ΡΡΠΎΠΊ ΠΏΠΎ ΠΌΠ΅ΡΠ΅ ΠΏΡΠΎΡΠ°ΠΈΠ²Π°Π½ΠΈΡ ΠΈ ΠΏΡΠΎΠΌΠ΅ΡΠ·Π°Π½ΠΈΡ. ΠΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΡΡ ΠΎΠ°Π·ΠΈΡΠ° ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠΎ, ΡΡΠΎ Π½Π° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠΎΠΊΠ° ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈ Π½Π΅ Π²Π»ΠΈΡΡΡ ΡΠ°ΡΡΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΏΠΎΠΊΡΠΎΠ² ΠΈ Π°Π½ΡΡΠΎΠΏΠΎΠ³Π΅Π½Π½Π°Ρ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΡ
Π‘ΡΡΠΎΠ΅Π½ΠΈΠ΅ ΠΏΡΠΈΠΏΠΎΠ²Π΅ΡΡ Π½ΠΎΡΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ Π»Π΅Π΄Π½ΠΈΠΊΠ° Π² ΡΠ°ΠΉΠΎΠ½Π΅ Π±ΡΡ ΡΡ Π’Π°Π»Π° (ΠΠΎΡΡΠΎΡΠ½Π°Ρ ΠΠ½ΡΠ°ΡΠΊΡΠΈΠ΄Π°) ΠΏΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°ΠΌ Π³Π΅ΠΎΡΠ°Π΄Π°ΡΠ½ΡΡ ΡΠ°Π±ΠΎΡ ΡΠ΅Π·ΠΎΠ½Π° 2018/19 Π³.
The paper discusses the results of the ground-penetrating radar (GPR) survey carried out in February 2019 in the area of Thala Bay (Larsemann Hills, East Antarctica). Thala Bay is one of the strategic facilities of the Russian Antarctic Expedition (RAE) in the Progress station area as since 2019 heavy cargo has been unloaded here intended for the construction of new facilities at the Vostok station. Transportation of goods to the point of formation of logistic traverses takes place on ice tracks, whose safety must be evaluated taking into account the expanded system of crevasses. In addition, the current track is characterized by a significant slope of the terrain, which also complicates the relocation of heavy equipment.In February 2019, a GPR survey was carried out within the Thala Bay area to assess the possibility of organizing an alternative section of the route within it. According to the visual observations, this area was characterized by an extensive system of crevasses, the width of which at the surface reached 20-30 cm, and the prevailing longitudinal direction coincided with the direction of the route. The task of the geophysical survey was to map the crevasses not identified by visual inspection and to determine their morphology. According to the GPR data, it was shown that the crevasses within the site are located to the firn layer and are characterized by an irregular shape, significantly expanding at the deeper levels and reaching a width of 6 m. The results of the survey are illustrated with the scheme of the firn thickness which shows location of the crevasses. According to the recommendations of the authors, the section of the glacier is suitable for operation provided the glaciological situation using the GPR method is monitored annualy.Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΎΠ±ΡΡΠΆΠ΄Π°ΡΡΡΡ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π³Π΅ΠΎΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ, Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΡ
Π² ΡΠ°ΠΉΠΎΠ½Π΅ ΡΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π°Π½ΡΠ°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ°Π½ΡΠΈΠΈ ΠΡΠΎΠ³ΡΠ΅ΡΡ (ΠΎΠ°Π·ΠΈΡ Π₯ΠΎΠ»ΠΌΡ ΠΠ°ΡΡΠ΅ΠΌΠ°Π½Π½, ΠΠΎΡΡΠΎΡΠ½Π°Ρ ΠΠ½ΡΠ°ΡΠΊΡΠΈΠ΄Π°) Π² ΡΠ΅Π·ΠΎΠ½ 64-ΠΉ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π°Π½ΡΠ°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΡΠΏΠ΅Π΄ΠΈΡΠΈΠΈ (Π ΠΠ) Π² 2018/19 Π³. ΠΠ·ΡΡΠΊΠ°Π½ΠΈΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ Ρ ΡΠ΅Π»ΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΠΈ ΡΡΠ°ΡΡΠΊΠ° Π»Π΅Π΄Π½ΠΈΠΊΠ° Π² ΡΠ°ΠΉΠΎΠ½Π΅ ΠΏΡΠ½ΠΊΡΠ° ΡΠ°Π·Π³ΡΡΠ·ΠΊΠΈ ΡΡΠ΄ΠΎΠ² Π² Π±ΡΡ
ΡΠ΅ Π’Π°Π»Π° Π΄Π»Ρ ΠΏΡΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΡ Π² Π΅Π³ΠΎ ΠΏΡΠ΅Π΄Π΅Π»Π°Ρ
ΡΡΠ°ΡΡΡ ΠΏΠ΅ΡΠ΅Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΡΡΠΆΠ΅Π»ΠΎΠΉ ΡΠ°Π½Π½ΠΎ-Π³ΡΡΠ΅Π½ΠΈΡΠ½ΠΎΠΉ ΡΠ΅Ρ
Π½ΠΈΠΊΠΈ. ΠΠΎ ΠΈΡΠΎΠ³Π°ΠΌ Π³Π΅ΠΎΡΠ°Π΄Π°ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠΈΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π² ΠΏΡΠ΅Π΄Π΅Π»Π°Ρ
ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΠΎΠ³ΠΎ ΡΠ°ΠΉΠΎΠ½Π° Π²ΡΡΠ²Π»Π΅Π½Π° ΡΠ΅ΡΡ ΡΡΠ΅ΡΠΈΠ½, ΡΠ°Π·Π²ΠΈΡΡΡ
Π² ΡΠ½Π΅ΠΆΠ½ΠΎ-ΡΠΈΡΠ½ΠΎΠ²ΠΎΠΉ ΡΠΎΠ»ΡΠ΅ ΠΈ Π΄ΠΎΡΡΠΈΠ³Π°ΡΡΠΈΡ
ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠΉ ΡΠΈΡΠΈΠ½Ρ 6 ΠΌ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠ°Π±ΠΎΡ ΠΏΡΠΎΠΈΠ»Π»ΡΡΡΡΠΈΡΠΎΠ²Π°Π½Ρ ΡΡ
Π΅ΠΌΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΡΠ½Π΅ΠΆΠ½ΠΎ-ΡΠΈΡΠ½ΠΎΠ²ΠΎΠΉ ΡΠΎΠ»ΡΠΈ ΠΏΠΎ ΡΡΠ°ΡΡΠΊΡ ΡΠ°Π±ΠΎΡ ΠΈ ΠΈΡ
ΡΠ°ΡΠΏΡΠΎΡΡΡΠ°Π½Π΅Π½ΠΈΡ ΠΏΠΎ ΡΠΎΡΡΠΎΡΠ½ΠΈΡ Π½Π° ΡΠ΅Π²ΡΠ°Π»Ρ 2019 Π³
Π‘ΡΡΠΎΠ΅Π½ΠΈΠ΅ ΡΠ½Π΅ΠΆΠ½ΠΎ-Π»Π΅Π΄ΠΎΠ²ΡΡ ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅ΠΊ ΠΏΡΠΎΡΡΠ²Π½ΡΡ ΠΎΠ·ΡΡ ΠΏΠΎΠ»ΡΠΎΡΡΡΠΎΠ²Π° ΠΡΠΎΠΊΠ½Π΅Ρ (ΠΎΠ°Π·ΠΈΡ Π₯ΠΎΠ»ΠΌΡ ΠΠ°ΡΡΠ΅ΠΌΠ°Π½Π½, ΠΠΎΡΡΠΎΡΠ½Π°Ρ ΠΠ½ΡΠ°ΡΠΊΡΠΈΠ΄Π°) ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ Π³Π΅ΠΎΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΈ
During the summer ο¬eld season of the 65th Russian Antarctic Expedition a research aimed at studying the structure of the snow-Βice dams of the Lakes Progress and Discussion (Larsemann Hills, East Antarctica), which are characterized with annual outburst ο¬oods, was carried out. Survey was performed using groundΒpenetrating radar sounding complemented with nonΒcore drilling and analysis of the aerial photo data acquired with unmanned aerial vehicle during the last ο¬eld seasons. The results show that location of the waterways, which occur during the outbursts of the both lakes, does not change signiο¬cantly year in year out and ο¬ts a linear depression in basement topography under the dam and a following ο¬exure of the ice layer. During the winter period, the opened channels are being ο¬lled with snow, and thereby a natural soο¬
ened zone is being formed. Further outburst ο¬ood propagates mainly within this zone. Monitoring survey of the snowΒi-ce dam of the Progress Lake during the summer period showed that destruction of the dam does not happen rapidly when the outburst takes place, but begins a few weeks before it with gradual ο¬ltration within the snow layer.ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΡΡΠΎΠ΅Π½ΠΈΡ ΡΠ½Π΅ΠΆΠ½ΠΎ-Π»Π΅Π΄ΠΎΠ²ΡΡ
ΠΏΠ΅ΡΠ΅ΠΌΡΡΠ΅ΠΊ ΠΏΡΠΎΡΡΠ²ΠΎΠΎΠΏΠ°ΡΠ½ΡΡ
ΠΎΠ·ΡΡ ΠΡΠΎΠ³ΡΠ΅ΡΡ ΠΈ ΠΠΈΡΠΊΠ°ΡΠ½ (ΠΎΠ°Π·ΠΈΡ Π₯ΠΎΠ»ΠΌΡ ΠΠ°ΡΡΠ΅ΠΌΠ°Π½Π½, ΠΠΎΡΡΠΎΡΠ½Π°Ρ ΠΠ½ΡΠ°ΡΠΊΡΠΈΠ΄Π°), Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠ΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π³Π΅ΠΎΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΈ. ΠΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ Π±Π΅ΡΠΊΠ΅ΡΠ½ΠΎΠ²ΠΎΠ΅ ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π±ΡΡΠ΅Π½ΠΈΠ΅ ΠΈ Π°ΡΡΠΎΡΠΎΡΠΎΡΡΡΠΌΠΊΠ° Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π±Π΅ΡΠΏΠΈΠ»ΠΎΡΠ½ΠΎΠ³ΠΎ Π»Π΅ΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π°ΠΏΠΏΠ°ΡΠ°ΡΠ°. ΠΠ° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΠΈΠ·ΡΡΠ΅Π½Π½ΡΡ
Π²ΠΎΠ΄ΠΎΡΠΌΠΎΠ² ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Ρ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ Π³Π΅ΠΎΠ»ΠΎΠ³ΠΎ-Π³Π»ΡΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ΅Π½Π΄Π΅Π½ΡΠΈΠΈ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΡΡΠ²Π½ΡΡ
ΠΏΠ°Π²ΠΎΠ΄ΠΊΠΎΠ² Π»Π΅Π΄Π½ΠΈΠΊΠΎΠ²ΡΡ
ΠΎΠ·ΡΡ
Coronavirus disease (COVID-19) and disseminated intravascular coagulation syndrome
COVID-19 is an infectious disease caused by the beta-coronavirus SARS-CoV-2 that in 2020 has spread worldwide. In most severe patients, the clinical picture begins with respiratory failure further deteriorating up to multiple organ failure. Development of coagulopathy is the most adverse prognostic. Analyzing currently available clinical data revealed that 71.4 % and 0.6 % of survivors and fatal cases, respectively, demonstrated signs of overt disseminated intravascular coagulation (DIC). Monitoring D-dimer level, prothrombin time, platelet count and fibrinogen content is important for determining indications for treatment and hospitalization in COVID-19 patients. In case such parameters deteriorate, a more pro-active βaggressiveβ intensive care should be applied. Low molecular weight heparin (LMWH) should be administered to all patients with diagnosed COVID-19 infection (including non-critical patients) requiring hospitalization, but having no contraindications to LMWH
Nutritional Sensor REDD1 in Cancer and Inflammation: Friend or Foe?
Regulated in Development and DNA Damage Response 1 (REDD1)/DNA Damage-Induced Transcript 4 (DDIT4) is an immediate early response gene activated by different stress conditions, including growth factor depletion, hypoxia, DNA damage, and stress hormones, i.e., glucocorticoids. The most known functions of REDD1 are the inhibition of proliferative signaling and the regulation of metabolism via the repression of the central regulator of these processes, the mammalian target of rapamycin (mTOR). The involvement of REDD1 in cell growth, apoptosis, metabolism, and oxidative stress implies its role in various pathological conditions, including cancer and inflammatory diseases. Recently, REDD1 was identified as one of the central genes mechanistically involved in undesirable atrophic effects induced by chronic topical and systemic glucocorticoids widely used for the treatment of blood cancer and inflammatory diseases. In this review, we discuss the role of REDD1 in the regulation of cell signaling and processes in normal and cancer cells, its involvement in the pathogenesis of different diseases, and the approach to safer glucocorticoid receptor (GR)-targeted therapies via a combination of glucocorticoids and REDD1 inhibitors to decrease the adverse atrophogenic effects of these steroids
Scaffold Chemical Model Based on CollagenβMethyl Methacrylate Graft Copolymers
Polymerization of methyl methacrylate (MMA) in aqueous collagen (Col) dispersion was studied in the presence of tributylborane (TBB) and p-quinone: 2,5-di-tert-butyl-p-benzoquinone (2,5-DTBQ), p-benzoquinone (BQ), duroquinone (DQ), and p-naphthoquinone (NQ). It was found that this system leads to the formation of a grafted cross-linked copolymer. The inhibitory effect of p-quinone determines the amount of unreacted monomer, homopolymer, and percentage of grafted poly(methyl methacrylate) (PMMA). The synthesis combines two approaches to form a grafted copolymer with a cross-linked structureββgrafting toβ and βgrafting fromβ. The resulting products exhibit biodegradation under the action of enzymes, do not have toxicity, and demonstrate a stimulating effect on cell growth. At the same time, the denaturation of collagen occurring at elevated temperatures does not impair the characteristics of copolymers. These results allow us to present the research as a scaffold chemical model. Comparison of the properties of the obtained copolymers helps to determine the optimal method for the synthesis of scaffold precursorsβsynthesis of a collagen and poly(methyl methacrylate) copolymer at 60 Β°C in a 1% acetic acid dispersion of fish collagen with a mass ratio of the components collagen:MMA:TBB:2,5-DTBQ equal to 1:1:0.015:0.25