319 research outputs found
LOW TEMPERATURE INTRAMOLECULAR ENERGY TRANSFER IN GAS PHASE EVIDENCED BY LUMINESCENCE OF , AND CN.
No full text1. E.B. Gordon, A.A.Pelmenev, O.F. Pugachev and V.V.Khmelenko, Chem. Phys. 61(1,2), 35-41, 1981. 2. E.B. Gordon, M.V. Martynenko, A.A. Pelmenev, O.F. Pugachev and V.V. Khmelenko, Khimicheskay Fizika, 13(3), 15-28, 1994, (in Russian).Author Institution: Institute for Energy Problems of Chemical Physics, 1142432, Chernogolovka, Moscow Region, Russia.Gas phase luminescence spectra of N_{2} (1^{+}-system), (N^{+}}_{2} (1^{+}-system), and CN (Red system) in the temperature range 180K - 20K have been studied in the frame of original experimental approach [1] consisting in injection of helium gas jet containing the exposed to HF discharge admixtures under investigation into the cryostat with superfluid helium . At low temperatures together with strong suppression of rotational structure the dramatic changes in the vibronic bands intensity (some bands almost completely disappear) are observed [2]. For all vibrational levels from which emission is temperature sensitive there are quasiresonant vibrational levels belonging to another electronic states of the same species. So the effect has been explained by effective energy transfer between the electronic states induced by collisions with cold helium atoms . The emission bands intensity is determined by mutual disposition of the interacting levels. Its decrease or increase depend on whether exothermic or endothermic, respectively, transition from emitting level to neighboring one. Observed phenomena provide new opportunities for accurate testing the mutual disposition of different electronic states in diatomics as well as for study of intersystem collisional induced processes
Intraoligochaete development of Myxobolus intimus (Myxosporea: Myxobolidae), a gill myxosporean of the roach (Rutilus rutilus)
No full textThe infection with Myxobolus intimus Zaika, 1965 in the gills of the roach Rutilus rutilus (L.) from Lake Balaton was recorded in 28 out of the 39 fish examined. Developing and mature plasmodia were detected on the gills exclusively in the spring. The Myxobolus intimus infection was found only in 2- to 3-year-old fish. In histological sections, young plasmodia were found in capillaries of the secondary lamellae. More mature, round plasmodia 0.4-0.6 mm in diameter, deformed the respiratory lamellae. The intraoligochacte development of M. intimus was studied in experimentally infected oligochaetes. In two experiments, uninfected Tubifex tubifex Muller and Limnodrilus hoffmeisteri (Claparede) were exposed to mature myxospores of M. intimus. In both experiments, typical triactinospores developed in T. tubifex specimens but no infection was found in L. hoffmeisteri. In semithin sections, developmental stages, pansporocysts and actinospores, were found within the proliferated gut epithelium of T. tubifex. Triactinospores were first released from oligochaetes 37 and 58 days after initial exposure in the two experiments, respectively. Each triactinospore had three pyriform polar capsules and a cylindrical sporoplasm with 32 secondary cells. The spore body joined the 3 caudal projections with a moderately long style
Development of Myxobolus dispar (Myxosporea : Myxobolidae) in an oligochaete alternate host, Tubifex tubifex
No full textThe development of Myxobolus dispar Thelohan, 1895, a myxosporean parasite of the gills of common carp (Cyprinus carpio L.) was studied in experimentally infected oligochaetes Tubifex tubifex Muller. After infection of uninfected tubificids with mature spores of M. dispar development of actinosporean stages was first observed light microscopically 21 days after initial exposure. In histological sections, early pansporocysts were located in the gut epithelium of experimental oligochaetes, while advanced stages occupied mostly the outer layers of the gut and the coelozoic space. Mature pansporocysts, each containing 8 raabeia spores, appeared 199 days after initial exposure. Following damage of the intestinal wall and rupture of the pansporocysts, free actinosporean stages were found in the gut lumen of the oligochaetes. Actinospores of M. dispar emerged from the worms after 217 days of intra-oligochaete development. They were floating in the water and showed a unique raabeia form. Each raabeia sport had three pyriform polar capsules and a cylindrical-shaped sporoplasm with approximately 32 secondary cells. The spore body joined the three caudal projections without a style. Caudal projections were bifurcated at the end and the two main branches had further small bifurcations. The total length of the raabeia sport was approximately 158 mu m. The prevalence of infection in 240 experimentally infected Tubifex specimens was 99.2%. No infection was found in the control oligochaetes
Prediction of rotordynamic coefficients for short labyrinth gas seals using computational fluid dynamics
No full textThe analysis is presented for the computational fluid dynamics (CFD)-based modeling of short labyrinth gas seals. Seal leakage performance can be reliably predicted with CFD for a wide operating range and various sealing configurations. Prediction of seal influence on the rotordynamic stability, however, is a challenging task requiring relatively high computer processing power. A full 3D eccentric CFD model of a short staggered three-tooth-on-stator labyrinth seal is built in ANSYS CFX. An extensive grid independence study is carried out showing influence of the grid refinement on the stiffness coefficients. Three methods for the prediction of stiffness and damping coefficients as well as the effect of turbulence modeling, boundary conditions, and solver parameters are presented. The rest of the paper shows the results of a parameter variation (inlet pressure, preswirl, and shaft rotational speed) for two labyrinth seals with a tooth radial clearance of 0.5 mm and 0.27 mm, respectively. The latter was compared with experimental data in Pugachev and Deckner, 2010, textquotelefttextquoteleftAnalysis of the Experimental and CFD-Based Theoretical Methods for Studying Rotordynamic Characteristics of Labyrinth Gas Seals,textquoterighttextquoteright Proceedings of ASME Turbo Expo 2010, Paper No. GT2010-22058
Description of two new actinosporean types from a brook of Fuji Mountain, Honshu, and from Chitose River, Hokkaido, Japan
No full textActinospore infection of oligochaetes living in the mud of 3 freshwater biotopes in Japan was studied. Using the cell-well plate method, a new aurantiactinomyxon type was found in 0.77 % of the examined Tubifex tubifex oligochaete specimens from a brook near Yamanashi Prefectural Fisheries Experimental Station on Fuji Mountain. In 0.14 % of Lumbriculus variagetus collected from Chitose River, near Chitose Salmon Hatchery, a new siedleckiella type was found, while at the same time 8.1 % of the Lumbriculus spp. oligochaetes released triactinomyxons of Myxobolus arcticus. Of the examined Rhyacodrilus komarovi oligochaetes collected from the Mena River system, Hokkaido, 0.2, 0.6, 0.5 and 0.8% were infected with echinactinomyxon, neoactinomyxum and 2 types of triactinomyxon spores, respectively, and described in our previous paper. The oligochaetes released actinospores for several weeks. Actinospore infection showed high intensity in positive oligochaetes in the case of all the actinosporean types. Two of the actinospore types (aurantiactinomyxon and siedleckiella) presented here have not been previously described
Specific PCR for Myxobolus arcticus SSU rDNA in juvenile sockeye salmon Oncorhynchus nerka from British Columbia, Canada
No full textA PCR for the specific detection of the salmon brain parasite Myxobolus arcticus (Pugachev and Khokhlov, 1979) was developed using primers designed to amplify a 1363 base pair fragment of the small subunit rDNA. The assay did not amplify DNA from 5 other Myxobolus species or from 7 other myxozoan species belonging to 5 other genera. For juvenile sockeye salmon Oncorhynchus nerka (Walbaum) collected from Chilko Lake, British Columbia (BC), Canada, in 2011, the prevalence by PCR was 96%, in contrast to 71% by histological examination of brain tissue. In 2010, the histological prevalence was 52.5%. Sequence identity between M. arcticus from Chilko Lake and other sites in BC ranged from 99.7 to 99.8% and was 99.6% for a Japanese sequence. In contrast, an M. arcticus sequence from Norway shared 95.3% identity with the Chilko Lake sequence, suggesting misidentification of the parasite. Chilko Lake sockeye salmon were previously reported free of infection with M. arcticus, and more research is required to understand the processes involved in the local and global dispersion of this parasite
Synthesis and Antitumor Activity of Novel Pyridoxine-Based Bioisosteric Analogs of trans -Stilbenes
No full text© 2017 Mikhail V. Pugachev et al. A series of trans-6-phenylethenyl substituted pyridoxine derivatives, novel bioisosteric analogs of drugs based on trans-stilbene scaffold, were synthesized using the Wittig reaction of a bis-triphenylphosphonium pyridoxine derivative with various aromatic aldehydes. Two compounds demonstrated high activity against the estrogen-dependent MCF-7 (breast cancer) cell line with IC 50 in the range of 1.9-7.9 μM and very good selectivity for other studied normal and tumor cells, including the estrogen receptor negative MDA-MB-231 breast cancer cells. The active compounds possessed an intense blue fluorescence, and this feature allowed us to effectively visualize them in cytoplasm and in nucleus. The obtained results make the described chemotype a promising starting point for the development of new anticancer agents for the therapy of estrogen-dependent malignancies
Synthesis and Antitumor Activity of Novel Pyridoxine-Based Bioisosteric Analogs of trans -Stilbenes
No full text© 2017 Mikhail V. Pugachev et al. A series of trans-6-phenylethenyl substituted pyridoxine derivatives, novel bioisosteric analogs of drugs based on trans-stilbene scaffold, were synthesized using the Wittig reaction of a bis-triphenylphosphonium pyridoxine derivative with various aromatic aldehydes. Two compounds demonstrated high activity against the estrogen-dependent MCF-7 (breast cancer) cell line with IC 50 in the range of 1.9-7.9 μM and very good selectivity for other studied normal and tumor cells, including the estrogen receptor negative MDA-MB-231 breast cancer cells. The active compounds possessed an intense blue fluorescence, and this feature allowed us to effectively visualize them in cytoplasm and in nucleus. The obtained results make the described chemotype a promising starting point for the development of new anticancer agents for the therapy of estrogen-dependent malignancies
Shklovsky in the Cinema, 1926-1932
No full textThe following research project is grounded in the interrelated contexts of the Russian intelligentsia’s ambivalent engagement with post-revolutionary culture and cinema’s rise as an artistic medium and instrument of Russian cultural development. By examining Viktor Shklovsky’s earliest activities in the Soviet film industry, this project will explore how narrative, aesthetic, and ideological programmes were repeatedly and variously moulded, undermined, and complicated by the twentieth-century Russian avant-garde interest in dissolving creative boundaries between the domains of the ‘internal’ (embracing private, individual, and domestic concerns) and ‘external’ (their public, communal, and social counterparts) in a bid ‘to turn space outwards’ (vyvorachivat´ prostranstvo vovne). These critical enquiries will lend themselves to an investigation of how the behaviours of Shklovsky, his colleagues, and his artistic creations were affected by internal and/or external loci of control and how these activities were reconciled (if at all) in a society where the relationship between freedom and necessity was in a constant state of fluctuation.
This research aims not simply to establish the extent and significance of Shklovsky’s influence on cinema as an individual, but rather to utilise his personal narrative for an assessment of the levels of interaction between theory and practice and between the verbal and the visual as integral to the intelligentsia movement. The project will investigate the part that Shklovsky played in conceptualising the boundaries, exchanges, and conflicts that arose between different artistic media and the critical institutions that developed around them, before considering how these relations changed as Soviet culture entered and emerged from the period of Cultural Revolution. In addition, an exploration of the effects of personal and professional tensions between different ideological groups will not only develop a better understanding of Shklovsky’s role in the cinema as theorist, critic, polemicist, screenwriter, and ‘creative administrator’, but will also help to establish the similarities and/or disparities between his film-works and contemporary cultural experience
Essays in Banking: Consolidation, Shock Transmission, and Payout
No full textThis dissertation comprises three essays. The first documents the equilibrating effect of bank M&As on deposit and loan markets; the second explores board interlocks as a means of bank-shock transmission across sectors; the last investigates the value of payout to bank investors.
Chapter 1 examines deposit and loan volume and price changes around all ownership-changing U.S. bank M&As between 1998 and 2016. I find that M&A impacts target markets differently based on their deposit-loan imbalances. In markets where loans are scarce relative to deposits, lending (deposit-gathering) increases by more (less); where deposits are relatively scarce, the effects reverse. Thus, M&A reduces deposit-loan imbalances, equilibrating markets. Deposit-loan rebalancing correlates with better economic outcomes. Deposit and loan price analysis, however, is inconclusive. Overall, my findings support a welfare-enhancing view of bank M&A.
Chapter 2 uses 1,245 U.S. bank enforcement actions (EAs) issued between 1990 and 2017 to show that board interlocks transmit bank shocks into the real economy. When a non-financial firm (NFF) and bank share a common director, NFF stock prices fall around EAs issued to the bank. The effect is stronger for more severe EAs. During enforcement years, common directors participate less on NFF boards and more on bank boards. These results are unlikely to reflect an impaired credit relationship, director reputational damage, or endogenous director selection. They imply that board interlocks could transmit larger bank shocks into the real economy.
Chapter 3 reexamines whether investors value payout and why. I study abnormal stock returns around regulatory EAs that restrict bank dividends and repurchases. Market reactions are significantly worse for enforced banks that pay out than for those that do not. Withstanding alternative explanations and parallel trend concerns, these results present rare, causal evidence of a value to corporate distribution. The cross-section of abnormal returns suggests that risk-shifting, not agency cost reduction, drives payout. In my sample of distressed banks, especially around financial crises, the ability to shift risk through payout has value
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