Accumulation of free polyamines enhances the antioxidant response in fruits of grafted tomato plants under water stress.

PubMed

Sánchez-Rodríguez, E; Romero, L; Ruiz, J M

2016-01-15

Polyamines, small aliphatic polycations, have been suggested to play key roles in a number of biological processes. In this paper, attempts were made to investigate the possibility of improving antioxidant response of tomato fruits in relation with endogenous free polyamines content. We studied the reactive oxygen species and polyamines content, and antioxidant and polyamine-biosynthesis enzyme activities in fruits of ungrafted and grafted tomato plants under moderate water stress. We used a drought-tolerant cultivar (Zarina) and drought-sensitive cultivar (Josefina) to obtain reciprocal graft, selfgraft and ungraft plants. Fruits contained higher endogenous polyamine content during the course of the experiment relative to the control, coupled with higher arginine decarboxylase and spermine synthase activities in Zarina ungrafted and ZarxJos. In these cultivars, tomato fruits showed a lower reactive oxygen species generation and higher catalase and superoxide dismutase activities, suggesting that a higher content in polyamines (especially spermine) exerted a positive effect on antioxidant systems. All of these data suggest that spermine leads to more effective reactive oxygen species scavenging (less tissue damage) in tomato fruits, which may function collectively to enhance dehydration tolerance. Copyright © 2015 Elsevier GmbH. All rights reserved.

The Wind Energy Potential of Kurdistan, Iran

PubMed Central

Arefi, Farzad; Moshtagh, Jamal; Moradi, Mohammad

2014-01-01

In the current work by using statistical methods and available software, the wind energy assessment of prone regions for installation of wind turbines in, Qorveh, has been investigated. Information was obtained from weather stations of Baneh, Bijar, Zarina, Saqez, Sanandaj, Qorveh, and Marivan. The monthly average and maximum of wind speed were investigated between the years 2000–2010 and the related curves were drawn. The Golobad curve (direction and percentage of dominant wind and calm wind as monthly rate) between the years 1997–2000 was analyzed and drawn with plot software. The ten-minute speed (at 10, 30, and 60 m height) and direction (at 37.5 and 10 m height) wind data were collected from weather stations of Iranian new energy organization. The wind speed distribution during one year was evaluated by using Weibull probability density function (two-parametrical), and the Weibull curve histograms were drawn by MATLAB software. According to the average wind speed of stations and technical specifications of the types of turbines, the suitable wind turbine for the station was selected. Finally, the Divandareh and Qorveh sites with favorable potential were considered for installation of wind turbines and construction of wind farms. PMID:27355042

Preface

NASA Astrophysics Data System (ADS)

Jakovics, A.

2007-06-01

The International Scientific Colloquium "Modelling for Material Processing" took place last year on June 8-9. It was the fourth time the colloquium was organized. The first colloquium took place in 1999. All colloquia were organized by the University of Latvia together with Leibniz University of Hannover (Germany) that signifies a long-term tradition (since 1988) of scientific cooperation between researchers of these two universities in the field of electrothermal process modelling. During the last colloquium scientific reports in the field of mathematical modelling in industrial electromagnetic applications for different materials (liquid metals, semiconductor technology, porous materials, melting of oxides and inductive heating) were presented. 70 researchers from 10 countries attended the colloquium. The contributions included about 30 oral presentations and 12 posters. The most illustrative presentations (oral and poster) in the field of MHD were selected for publication in a special issue of the international journal "Magnetohydrodynamics". Traditionally, many reports of the colloquium discuss the problems of MHD methods and devices applied to the metallurgical technologies and processes of semiconductor crystal growth. The new results illustrate the influence of combined electromagnetic fields on the hydrodynamics and heat/mass transfer in melts. The presented reports demonstrate that the models for simulation of turbulent liquid metal flows in melting furnaces, crystallization of alloys and single crystal growth in electromagnetic fields have become much more complex. The adequate description of occurring physical phenomena and the use of high performance computer and clusters allow to reduce the number of experiments in industrial facilities. The use of software and computers for modelling technological and environmental processes has a very long history at the University of Latvia. The first modelling activities in the field of industrial MHD applications had led to the establishment of the chair of Electrodynamics and Continuum Mechanics in 1970, the first head of which was professor Juris Mikelsons. In the early 90's, when all research institutions in our country underwent dramatic changes, not all research directions and institutions managed to adapt successfully to the new conditions. Fortunately, the people who were involved in computer modelling of physical processes were among the most successful. First, the existing and newly established contacts in Western Europe were used actively to reorient the applied researches in the directions actively studied at the universities and companies, which were the partners of the University of Latvia. As a result, research groups involved in these activities successfully joined the international effort related to the application of computer models to industrial processes, and the scientific laboratory for Mathematical Modelling of Environmental and Technological Processes was founded in 1994. The second direction of modelling development was related to the application of computer-based models for the environmental and technological processes (e.g., sediment transport in harbours, heat transfer in building constructions) that were important for the companies and state institutions in Latvia. Currently, the field of engineering physics, the core of which is the computer modelling of technological and environmental processes, is one of the largest and most successfully developing parts of researches and educational programs at the Department of Physics of the University of Latvia with very good perspectives in the future for the development of new technologies and knowledge transfer.

Verochka Zingan or recollections from the Physics Department of the Moscow University

NASA Astrophysics Data System (ADS)

Gaina, Alex

The author recollects his studentship during 70-th years at the Physics Department of the Moscow University. He was graduated from the theoretical Physics Department in 1977. The Rectors of the University that times were I.G. Petrovskii, R.V. Khokhlov and A.A. Logunov. The dean of the Physics Department was V.S. Fursov. As a particular event a meet with the former prime-minister of the USSR A.N. Kosygin is reported. Between professors mentioned throughout the recollections are A.I.Kitaigorodskii, Ya. B. Zel'dovich, D.D. Ivanenko, A.A. Sokolov, A.A. Vlasov, V.B. Braginsky, I.M. Ternov, L.A. Artsimovich, E.P. Velikhov and other, including that which became University professors later. A great number of colleagues from the Physics, Chemistry, Phylological and Historical Departments of the Moscow University are mentioned. Particularly, the students which entered the group 113 in 1971 and finished the group 601 in 1977 are listed. The recollections include 5 parts. Persons cited throughout the paper: A.N. Kosygin, A.S. Golovin, V. Kostyukevich, I.M. Ternov, E.G. Pozdnyak, A. N. Matveev, V.P. Elyutin, V.V. Kerzhentsev, 113 academic group (1971), V. Topala, E.A. Marinchuk, P.Paduraru, A.I. Kitaygorodski, A. Leahu, S. Berzan, B. Ursu, I. Coanda (Koade), M. Stefanovici, O. Bulgaru, A. Iurie-Apostol, A.S. Davydov, M.I. Kaganov, I.M. Lifshitz, Ya. B. Zel'dovich, A.Zhukov, A.I. Buzdin, N.S. Perov, V. Dolgov, P. Vabishchevich, A.A. Samarskii, V. Makarov, Irina Kamenskih, A.A. Arsen'ev, L.A. Artsimovich, A.A. Tyapkin, B.M. Pontecorvo, D.I. Blokhintsev, I.G. Petrovskii, R.V. Khokhlov, V.N. Rudenko, A.A. Sokolov, D.D. Ivanenko (Iwanenko), A.A. Vlasov, V.N. Ponomarev, N.N. Bogolyubov, N.N. Bogolyubov (Jr), V.Ch. Zhukovskii, Tamara Tarasova, Zarina Radzhabova (Malovekova), V.Malovekov, Tatiana Shmeleva, Alexandra C.Nicolescu, Tatiana Nicolescu, Rano Mahkamova, Miriam Yandieva, Natalia Germaniuk (Grigor'eva), E. Grigor'ev, A. Putro, Elena Nikiforova, B. Kostrykin, Galia Laufer, K. Laufer, Yu. El'nitskii, Gh. Nemtoi, Yu. Oprunenko, N.N. Semenov, Varun Sahni, A.A. Starobinskii, Liusea Burca, Serge Rollet, Tatyana Davydova, Zinaida Uglichina (Khafizova), T.Filippova, V.S. Filippov, Vera Zingan (Stefanovici), B.A. Gaina, E.F. Gaina, Valeri Gaina, A. Kirnitskii, M. Kavalerchik, Margarita Kavalerchik, Mark Rainis, L.I. Sedov, D. Mangeron, S. Taltu (Coanda), Z. Sali(Chitoroaga, Kitoroage), Raisa M. Gorbachova, Maria Bulgaru, S. Pavlichenko, Nadezhda Shishkan, A.N. Matveev, N.Ya. Tyapunina, D.F. Kiselev, V.A. Petukhov, N.Ch. Krutitskaya, G.N. Medvedev, A.A. Shishkin,I.A. Shishmarev,A.G. Sveshnikov, A.B. Vasil'eva, A.G. Yagola, I.I. Ol'hovskii, V.V. Kravtsov, V.V.Petkevich, V.I. Grigor'ev, V.S. Rostovskii, V.V. Balashov, B.I. Spasskii, V.D. Krivchenkov, M.B. Menskii, V.Ya. Fainberg, V.G. Kadyshevskii, B.K. Kerimov, V.A. Matveev, I.A. Kvasnikov, D.V. Gal'tsov, V.R. Khalilov, G.A. Chizhov,I.A. Obukhov, V.N. Melnikov, A.A. Logunov, A.N. Tavkhelidze,Yu.S. Vladimirov, N.F. Florea (Floria), B.A. Lysov, V.D. Kukin, 601-academic group (1977), A.R. Khokhlov, P.L. Kapitza, S.P. Kapitza, Ion C. Inculet, Ion I. Inculet,W. Bittner, Nikolay Florea (Floria), M.M. Heraskov, N.V. Sklifosovskii, N.N. Bantysh-Kamenskii, N.D. Zelinskii, Olga Crusevan (Krushevan), Eugenia Crusevan (Krushevan),L.S. Berg, I. Buzdugan (Buzdyga),S.G. Lazo, M.K. Grebenchya (Grebencea), V.T. Kondurar (Conduraru), E.A. Grebenikov, K.F. Teodorchik, V.A. Albitzky, M.V. Nazarov, Tatiana Nazarova, V. P. Oleinikov, O.V. Bolshakov, D.M. Nikolaev, V. Afanas'ev, Olga Tatarinskaya, Yu.V. Karaganchou, B.A. Volkov, V.K. Turta, S. Varzar, C. Sochichiu, V.B. Braginsky, V.S. Fursov, L.I. Brezhnev, V.I. Sobolev (INP MSU), V.A. Smirnov (INP MSU), L.D. Landau, M.A. Leontovich, A.G. Loskutova, Yu.M. Loskutov, N.S. Akulov, V.B. Gostev, A.R. Frenkin, N.N. Kolesnikov, A. Vasil'ev, V.N. Tsytovich, Ya.A. Frenkel, N.V. Mitskievich, E.A. Grebenikov, A.N. Prokopenya, A. Einstein, L.I. Sedov, A.N. Kolmogorov, V.I. Arnold, G.I.Popov, R.Z. Sagdeev, A.A. Kokoshin, A.E. Marinchuk, D.V. Gal'tsov, V.I. Petukhov, S.I. Vacaru, A. Matiukhin,V.L. Ginsburg, L.P. Grishchuk, I.D. Novikov, A.G. Polnarev, V.F. Shvartsman, R.A. Syunyaev, E.L. Feinberg, Yu.N. Gnedin, A.Ya. Yakovlev, B.N. El'tsin, G.Kasparov, N. Travkin. A part of the paper concerns graduated from the Moscow University as well as to doctoral fellows from the Moscow University based on the literature, cited in the paper, many of which became later professors, members of the Academy, political persons and other influent persons in the Republic of Moldova.