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Search for giant pulses of radio pulsars at frequency 111 MHz with LPA radio telescope

Research in Astronomy and Astrophysics 2018年第8期18卷 71-82页

作者： Andrey Nikolaevich Kazantsev vladimir alexeevich potapov E N.Lebedev Physical Institute of the Russian Academy of Sciences Pushchino Radio Astronomy ObservatoryPushchino 142290Russia

We have used the unique low frequency sensitivity of the Large Phased Array （LPA） radio telescope of Pushchino Radio Astronomy Observatory to collect a dataset consisting of single pulse observations of second period pulsars in the Northern Hemisphere. During observation sessions in 2011- 2017, we collected data on 71 pulsars at a frequency of 111 MHz using a digital pulsar receiver. We have discovered Giant Radio Pulses （GRPs） from pulsars B0301＋09 and B 1237＋25, and confirmed earlier reported generation of anomalously strong （probable giant） pulses from B 1133＋16 in a statistically significant dataset. Data for these pulsars and from B0950＋08 and B 1112＋50, earlier reported as pulsars generating GRPs, were analyzed to evaluate their behavior over long time intervals. It was found that the statistical criterion （power-law spectrum of GRP distribution of energy and peak flux density） seems not to be strict for pulsars with a low magnetic field at their light cylinder. Moreover, spectra of some of these pulsars demonstrate unstable behavior with time and have a complex multicomponent shape. In the dataset for B0950＋08, we have detected the strongest GRP from a pulsar with a low magnetic field at its light cylinder ever reported, having a peak flux density as strong as 16.8 kJy.

关键词： stars neutron - pulsars general - pulsars individual (PSR B0301+19 PSR B0320+39 PSR B0329+54 PSR B0809+74 PSR B0950+08 PSR B1112+50 PSR B1133+16 PSR B1237+25) - pulsars giant pulses individual pulses

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Tools for Protein Structure Prediction at the *** Web Portal

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Journal of Life Sciences 2012年第10期6卷 1174-1179页

作者： Sergey Feranchuk Ulyana potapova vladimir potapov Dmitry Mukha vladimir Nikolaev Sergei Belikov Met. Ltd. Minsk Kiseliova 20 Belarus Limnological Instiute SB RAS Irkutsk 664033 Russia Institute of Bioorganic Chemistry NAS Belarus Minsk 220141 Belarus Belozersky Institute of Physico-Chemical Biology Moscow 119992 Russia

lntemet services on bioinformatics still remain a popular tool for the researchers. Here the authors present a recently developed web-site http：//*** where several tools and pipelines for protein structure prediction are implemented. The prediction of a structure for a particular protein often requires a sensitive and iterative approach, and the web-site provides an environment for this kind of work. Software that is used in the services includes both free programs available in the Internet and newly developed algorithms. The service on homology screening in PDB for a structure template is implemented using an approach that is alternative to well-known BLAST algorithm and it has some advantages over BLAST. The service on homology modeling uses well-known Nest program. The service on protein energy estimate allows selecting a best template in the set of homologs and adds a functionality of fold recognition to the environment. The design of the site simplifies several of the most useful bioinformatics routines, thus making them available to a large community of researchers. Services are provided free of charge without registration, and the user＇s privacy is taken care of.

关键词： Web-service SOAP homology modeling homology screening protein folding.

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