Experimental modeling of the influence of the rise in average summer temperatures on carbon circulation in tundra ecosystems     

Yu. V. Barkhatov  A. A. Tikhomirov  S. A. Ushakova  V. N. Shikhov  S. I. Bartsev  A. G. Degermendzhi 《Doklady Earth Sciences》2016,471(1):1168-1170

A sealed vegetation chamber was designed and constructed for physical simulation of climate conditions in the Subarctic zone during the spring–summer time. The small laboratory tundra-simulating ecosystem (TSE) was created for comparative evaluation of the rates of soil respiration and of the total balance of carbon fluxes in tundra ecosystems. The test experiment was performed to study the TSE response to a temperature rise in air and soil by 2°C in terms of the intensity of the СО₂ flux. It was shown that this increase in temperature would cause a pronounced shift in the balance of СО₂ production and utilization in the ecosystem from near-zero values to a stable generation of 24 μmol/h of CO₂ per 1 kg of dry biomass.  相似文献   

Effects of Hypomagnetic Conditions and Reversed Geomagnetic Field on Calcium-Dependent Proteases of Invertebrates and Fish     

N. P. Kantserova  V. V. Krylov  L. A. Lysenko  N. V. Ushakova  N. N. Nemova 《Izvestiya Atmospheric and Oceanic Physics》2017,53(7):719-723

The effects of hypomagnetic conditions and the reversal of the geomagnetic field (GMF) on intracellular Ca²⁺-dependent proteases (calpains) of fish and invertebrates have been studied in vivo and in vitro. It is found that the intravital exposure of examined animals to hypomagnetic conditions leads to a significant decrease in its calpain activity. The activity of preparations of calcium-dependent proteases was tested in separate experiments. It is shown that preparations of Ca²⁺-dependent proteases from invertebrates and fish are also inactivated substantially under effect of hypomagnetic conditions. The ambiguous results obtained in the experiments with a reversed GMF do not make it possible to discuss the biological response of calcium-dependent proteases to the reversal of the GMF.  相似文献   

The M9shchv image tube for the 6-m telescope     

M. M. Bustlov  A. N. Burenkov  L. V. Gyavgyanen  V. G. Debur  P. A. Znykin  A. F. Klepov  L. I. Kondrashova  V. S. Rylov  B. M. Stepanov  T. I. Ushakova  T. M. Fedorovskaya 《Astrophysics》1980,16(1):114-118

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The Influence of Temperature and Humidity on Greenhouse Gas Emission in Experiments on Imitation of the Full Vegetation Cycle of Tundra Ecosystems     

Barkhatov  Yu. V.  Ushakova  S. A.  Shikhov  V. N.  Evgrafova  S. Yu.  Tikhomirov  A. A.  Degermendzhi  A. G. 《Doklady Earth Sciences》2018,483(2):1539-1541

Doklady Earth Sciences - Laboratory experiments were conducted in a hermetically sealed growth chamber with two soil samples obtained from the arctic tundra zone with different levels of moisture....  相似文献   

Type II-P Supernova SN 2018aoq in NGC 4151: Light Curves,Models, and Distance     

Tsvetkov  D. Yu.  Pavlyuk  N. N.  Vozyakova  O. V.  Shatsky  N. I.  Tatarnikov  A. M.  Nikiforova  A. A.  Baklanov  P. V.  Blinnikov  S. I.  Ushakova  M. G.  Larionova  E. G.  Borman  G. A. 《Astronomy Letters》2021,47(5):291-306

Astronomy Letters - The results of UBVRIJHK photometry for the type II-P supernova SN 2018aoq in NGC 4151 obtained from April 4, 2018, to January 14, 2019, with several telescopes, including the...  相似文献