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Krasnoobsk, Russia

Bronnikova M.,Russian Academy of Sciences | Panin A.,Moscow State University | Uspenskaya O.,Russian Academy of Agriculture | Fuzeina Y.,Moscow State University | Turova I.,Russian Academy of Sciences
Catena | Year: 2014

This study is an attempt to use closely related inter-complementary paleo-archives of a local landscape to access understanding of Late Pleistocene-Holocene environmental changes in the region. The study site is a small intermountain basin in the Sayan-Tuva Upland, 51°N., 97°E., 1300. m. a.s.l. Paleo-archives covering about 13,000. yrs were studied: paleosol-sedimentary sequences on a delta-alluvial fan of a small river, lacustrine sediments in bottom cores and on palsa-islands and soils of palsa-islands. The following sequence of environmental changes was established. The fluvial activity in the basin reached its maximum at the end of the Late Pleistocene. The sharp decrease of the fluvial activity is terminated by two successive paleosols of Pleistocene-Holocene transition. The older paleosol indicates meadow-steppe (or tundra-steppe) conditions with a shallow permafrost table and impeded drainage. The younger paleosol testifies on sharp aridization, biological activity suppression, contrasting water regime, and warming. Dammed lake appeared in the midst of the trough about 11,000. cal yr BP.Sedimentation on delta-alluvial fan was fairly inconsiderable in Holocene. The first part of Holocene (before 4000. cal yr BP) was most balanced in annual distribution of precipitation. Runoff, even being prominently enhanced in a fluvial and relatively warm sub-phase 8000-6250. cal yr BP, was canalized, without giving seasonal floods. Sub-phase 6250-3800 is characterized by increased continentality and relative aridization caused reduction of runoff, lowering of the lake level, and enhancement of cryogenic processes. The next phase 3800-2000. cal yr BP was more humid. It caused slight revival of fluvial processes and rise of lake level. The last 2000. years climate was more continental and the most arid within the studied period. The lake level and runoff values dropped again, and fluvial activity totally decreased. In contemporary soils aridization is reflected in widely spread Natric features and progressive salinization. © 2013 Elsevier B.V. Source


Krasnykh V.Yu.,Ural Federal University | Korolev V.N.,Ural Federal University | Ostrovskaya A.V.,Ural Federal University | Nagornov S.A.,Russian Academy of Agriculture
Thermal Engineering (English translation of Teploenergetika) | Year: 2013

We discuss the technical problem of how to transport granular material in a vertical direction from the underlying section of a multistage apparatus containing a fluidized bed to an upper section through tubes immersed into the fluidized bed without additional expenditures of energy. The intensity with which the dispersed medium (a mixture of gas and fuel particles) moves through the tube and the mass flowrate of particles are determined by the ratio between the hydraulic resistances of dispersed medium inside the tube and of the fluidized bed outside of it. In turn, this ratio depends on the fluidization number W (W = w s/w 0, where w s is the seepage velocity and w 0 is the fluidization commencement velocity) and on the tube immersing depth into the bed. © 2013 Pleiades Publishing, Inc. Source


Reznik S.Y.,Russian Academy of Sciences | Dolgovskaya M.Y.,Russian Academy of Sciences | Ovchinnikov A.N.,Russian Academy of Sciences | Belyakova N.A.,Russian Academy of Agriculture
Journal of Applied Entomology | Year: 2015

Photoperiodic regulation of reproductive diapause in two invasive and two native populations of Harmonia axyridis and in one native population of Harmonia yedoensis was investigated in laboratory at 20°C, five photoperiods (day length of 10, 12, 14, 16 and 18 h) and two diets: (i) eggs of the Angoumois grain moth Sitotroga cerealella and (ii) the green peach aphid, Myzus persicae. Laboratory strains originated from native populations of H. axyridis from Irkutsk province of Siberia and H. yedoensis from South Korea showed a strong photoperiodic response: under short photoperiods (10-14 h and 10-12 h for H. axyridis and H. yedoensis, correspondingly), all females which fed on eggs and most of those fed on aphids did not start to lay eggs during 40 days after emergence, while under long photoperiods, all females fed on aphids and most of those fed on eggs oviposited. The photoperiodic response of H. axyridis from South Korea was less strong: on the both diets, the range of the photoperiodic response (the difference in the proportion of ovipositing females between the treatments with long and short days) was ca 40%. In the European (Czech Republic) and in the Caucasian (Sochi region, Russia) invasive populations of H. axyridis, the photoperiodic response was very weak: the proportion of females that started oviposition (when fed on aphids) or at least reproductive maturation (when fed on eggs) during 40 days after emergence was close to 100%, independently of the photoperiodic conditions. Obviously, instead of a rapid micro-evolutionary adaptation of the critical day length to a new climate, the invasive populations of the harlequin ladybird decrease their dependence on photoperiod and thus the weak photoperiodic response of SE Asian population of H. axyridis can be considered as a pre-adaptation further developed during the invasion. © 2014 Blackwell Verlag GmbH. Source


Reznik S.Y.,Russian Academy of Sciences | Ovchinnikov A.N.,Russian Academy of Sciences | Dolgovskaya M.Y.,Russian Academy of Sciences | Belyakova N.A.,Russian Academy of Agriculture
Entomological Review | Year: 2015

The effects of day length on preimaginal development and reproductive maturation of females of laboratory strains which originated from two native: Irkutsk (Siberia, Russia) and Daegu (South Korea) and two invasive: Sochi (Caucasus, Russia) and Pardubice (Czechia) populations of Harmonia axyridis were investigated under the laboratory conditions. In all the 4 strains, the acceleration of development caused by the short day (all other conditions being equal) was relatively stronger in those larvae that later, at the adult stage, delayed reproductive maturation. This correlation can be considered as an indirect proof that both reactions are based on the common physiological mechanism. However, comparison of the parameters of photoperiodic responses showed that although the photoperiodic effect on reproductive maturation in individuals from Sochi and Pardubice invasive populations was relatively weak, the effect of day length on the rate of their preimaginal development was even somewhat stronger than that of individuals from Irkutsk and Daegu native populations. This uncorrelated interpopulation variation of the quantitative and qualitative photoperiodic responses suggests that in spite of the common physiological mechanism, the responses influencing preimaginal development and reproductive maturation of H. axyridis are to a certain extent independent and thus the evolution of their parameters (in particular, adaptation to new climate conditions) occurs independently. © 2015, Pleiades Publishing, Inc. Source


Efremova E.A.,Russian Academy of Agriculture | Marchenko V.A.,Russian Academy of Agriculture | Chernyak E.I.,RAS Institute of Organic Chemistry | Morozov S.V.,RAS Institute of Organic Chemistry
Pharmaceutical Chemistry Journal | Year: 2012

Aversectin C is an agent included in the composition of antiparasitic fodder granules. The concentration of aversectin C in blood plasma and its residual amounts in organs and tissues of sheep was determined by HPLC. The principal pharmacokinetic parameters of aversectin C were calculated based on these data. © 2012 Springer Science+Business Media, Inc. Source

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