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  • 1
    Publication Date: 2015-02-01
    Description: We report the discovery of an intriguing triple-mode RR Lyrae star found in the Optical Gravitational Lensing Experiment (OGLE) Galactic bulge collection, OGLE-BLG-RRLYR-24137. In the OGLE catalogue, the star was identified as RRd star – double-mode pulsator, pulsating simultaneously in the fundamental and in the first overtone modes. We find that third mode is excited and firmly detect its period doubling. Period ratios are not far from that expected for triple-mode – fundamental, first and third overtone – pulsation. Unfortunately, we cannot reproduce period ratios of the three modes with a consistent set of pulsation models. Therefore the other interpretation, that additional mode is non-radial, is also likely.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 2
    Publication Date: 2015-04-02
    Description: We present optical observations of the peculiar Type Ibn supernova (SN Ibn) OGLE-2012-SN-006, discovered and monitored by the Optical Gravitational Lensing Experiment-IV survey, and spectroscopically followed by Public ESO Spectroscopic Survey of Transient Objects (PESSTO) at late phases. Stringent pre-discovery limits constrain the explosion epoch with fair precision to JD = 245 6203.8 ± 4.0. The rise time to the I -band light-curve maximum is about two weeks. The object reaches the peak absolute magnitude M I  = –19.65 ± 0.19 on JD = 245 6218.1 ± 1.8. After maximum, the light curve declines for about 25 d with a rate of 4 mag (100 d) –1 . The symmetric I -band peak resembles that of canonical Type Ib/c supernovae (SNe), whereas SNe Ibn usually exhibit asymmetric and narrower early-time light curves. Since 25 d past maximum, the light curve flattens with a decline rate slower than that of the 56 Co– 56 Fe decay, although at very late phases it steepens to approach that rate. However, other observables suggest that the match with the 56 Co decay rate is a mere coincidence, and the radioactive decay is not the main mechanism powering the light curve of OGLE-2012-SN-006. An early-time spectrum is dominated by a blue continuum, with only a marginal evidence for the presence of He i lines marking this SN type. This spectrum shows broad absorptions bluewards than 5000 Å, likely O ii lines, which are similar to spectral features observed in superluminous SNe at early epochs. The object has been spectroscopically monitored by PESSTO from 90 to 180 d after peak, and these spectra show the typical features observed in a number of SN 2006jc-like events, including a blue spectral energy distribution and prominent and narrow ( v FWHM   1900 km s –1 ) He i emission lines. This suggests that the ejecta are interacting with He-rich circumstellar material. The detection of broad (10 4 km s –1 ) O i and Ca ii features likely produced in the SN ejecta (including the [O i ] 6300,6364 doublet in the latest spectra) lends support to the interpretation of OGLE-2012-SN-006 as a core-collapse event.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 3
    Publication Date: 2015-01-31
    Description: We present the analysis of Blazhko-type modulation in double-mode RR Lyrae (RRd) stars found in the Optical Gravitational Lensing Experiment (OGLE) photometry of the Galactic bulge. Modulation is detected in 15 stars. Most of them have non-typical period ratio of the radial modes. In the Petersen diagram, at a given period of the fundamental mode, they are located significantly below or above the sequence formed by the majority of RRd stars. Multiperiodic modulation is very frequent; two or three modulation periods are detected in eight stars. Modulation periods vary from ~20 to more than 300 d. Radial mode amplitudes can be modulated by a few to nearly 100 per cent. Both radial modes may be modulated with the same period. More commonly however, dominant modulation for the fundamental mode has different period than dominant modulation for the first overtone. Quite often modulation of only one mode is detected in the data. We find a clear feedback between pulsation amplitude of the dominant mode and mean stellar brightness: the lower the pulsation amplitude, the brighter the star. At phases of low pulsation amplitude, the mode periods are prone to fast changes. All the stars share the common feature: their pulsation properties are non-stationary. Amplitudes and phases of the radial modes vary irregularly on a long time-scale of a few hundred or thousand days. The short-term modulations are also irregular. One of the stars has switched the pulsation mode recently: from single-mode fundamental mode pulsation to RRd state. In other star the non-radial mode with characteristic ~0.61 period ratio to the first overtone is detected. This non-radial mode is likely modulated with the same period as the radial modes.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 4
    Publication Date: 2014-12-03
    Description: We present the discovery of a plausible disc-eclipse system OGLE-BLG182.1.162852. The OGLE light curve for OGLE-BLG182.1.162852 shows three episodes of dimming by I ~= 2–3 mag, separated by 1277 d. The shape of the light curve during dimming events is very similar to that of known disc-eclipse system OGLE-LMC-ECL-11893. The event is presently undergoing a dimming event, predicted to end on 2014 December 30. The next dimming episode for OGLE-BLG182.1.162852 is expected to occur in 2018 March.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
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  • 5
    Publication Date: 2014-07-19
    Description: We analyse long-term optical photometry for two Galactic recurrent novae (V745 Sco and V3890 Sgr) and one Large Magellanic Cloud object (Nova LMC 1990b) observed over several years by the Optical Gravitational Lensing Experiment (OGLE) sky survey. We do not find variability with the previously claimed orbital period of V745 Sco. This voids previous findings based on this value (e.g. the distance determination). The quiescence variability of this object is dominated by semiregular pulsations of the red giant secondary (with periods of 136.5 and 77.4 d). The photometry of Nova LMC 1990b reveals an unnoticed eruption in 2010 and eclipse-like variability in quiescence with a period of 1.26432(8) d. The photometric properties make this object very similar to U Sco. Finally, we describe the eruptions of two likely symbiotic novae, V5590 Sgr and OGLE-2011-BLG-1444. The secondary of V5590 Sgr is a Mira star with pulsation period of 236 d.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 6
    Publication Date: 2016-11-30
    Description: We present the discovery and first three months of follow-up observations of a currently on-going unusual transient detected by the Optical Gravitational Lensing Experiment (OGLE-IV) survey, located in the centre of a galaxy at redshift z = 0.1655. The long rise to absolute magnitude of –20.5 mag, slow decline, very broad He and H spectral features make OGLE16aaa similar to other optical/UV tidal disruption events (TDEs). Weak narrow emission lines in the spectrum and archival photometric observations suggest the host galaxy is a weak-line active galactic nucleus, which has been accreting at higher rate in the past. OGLE16aaa, along with SDSS J0748, seems to form a sub-class of TDEs by weakly or recently active supermassive black holes (SMBHs). This class might bridge the TDEs by quiescent SMBHs and flares observed as ‘changing-look quasars’, if we interpret the latter as TDEs. If this picture is true, the previously applied requirement for identifying a flare as a TDE that it had to come from an inactive nucleus, could be leading to observational bias in TDE selection, thus affecting TDE-rate estimations.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
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  • 7
    Publication Date: 2016-01-14
    Description: The development of targeted anti-cancer therapies through the study of cancer genomes is intended to increase survival rates and decrease treatment-related toxicity. We treated a transposon-driven, functional genomic mouse model of medulloblastoma with 'humanized' in vivo therapy (microneurosurgical tumour resection followed by multi-fractionated, image-guided radiotherapy). Genetic events in recurrent murine medulloblastoma exhibit a very poor overlap with those in matched murine diagnostic samples (〈5%). Whole-genome sequencing of 33 pairs of human diagnostic and post-therapy medulloblastomas demonstrated substantial genetic divergence of the dominant clone after therapy (〈12% diagnostic events were retained at recurrence). In both mice and humans, the dominant clone at recurrence arose through clonal selection of a pre-existing minor clone present at diagnosis. Targeted therapy is unlikely to be effective in the absence of the target, therefore our results offer a simple, proximal, and remediable explanation for the failure of prior clinical trials of targeted therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morrissy, A Sorana -- Garzia, Livia -- Shih, David J H -- Zuyderduyn, Scott -- Huang, Xi -- Skowron, Patryk -- Remke, Marc -- Cavalli, Florence M G -- Ramaswamy, Vijay -- Lindsay, Patricia E -- Jelveh, Salomeh -- Donovan, Laura K -- Wang, Xin -- Luu, Betty -- Zayne, Kory -- Li, Yisu -- Mayoh, Chelsea -- Thiessen, Nina -- Mercier, Eloi -- Mungall, Karen L -- Ma, Yusanne -- Tse, Kane -- Zeng, Thomas -- Shumansky, Karey -- Roth, Andrew J L -- Shah, Sohrab -- Farooq, Hamza -- Kijima, Noriyuki -- Holgado, Borja L -- Lee, John J Y -- Matan-Lithwick, Stuart -- Liu, Jessica -- Mack, Stephen C -- Manno, Alex -- Michealraj, K A -- Nor, Carolina -- Peacock, John -- Qin, Lei -- Reimand, Juri -- Rolider, Adi -- Thompson, Yuan Y -- Wu, Xiaochong -- Pugh, Trevor -- Ally, Adrian -- Bilenky, Mikhail -- Butterfield, Yaron S N -- Carlsen, Rebecca -- Cheng, Young -- Chuah, Eric -- Corbett, Richard D -- Dhalla, Noreen -- He, An -- Lee, Darlene -- Li, Haiyan I -- Long, William -- Mayo, Michael -- Plettner, Patrick -- Qian, Jenny Q -- Schein, Jacqueline E -- Tam, Angela -- Wong, Tina -- Birol, Inanc -- Zhao, Yongjun -- Faria, Claudia C -- Pimentel, Jose -- Nunes, Sofia -- Shalaby, Tarek -- Grotzer, Michael -- Pollack, Ian F -- Hamilton, Ronald L -- Li, Xiao-Nan -- Bendel, Anne E -- Fults, Daniel W -- Walter, Andrew W -- Kumabe, Toshihiro -- Tominaga, Teiji -- Collins, V Peter -- Cho, Yoon-Jae -- Hoffman, Caitlin -- Lyden, David -- Wisoff, Jeffrey H -- Garvin, James H Jr -- Stearns, Duncan S -- Massimi, Luca -- Schuller, Ulrich -- Sterba, Jaroslav -- Zitterbart, Karel -- Puget, Stephanie -- Ayrault, Olivier -- Dunn, Sandra E -- Tirapelli, Daniela P C -- Carlotti, Carlos G -- Wheeler, Helen -- Hallahan, Andrew R -- Ingram, Wendy -- MacDonald, Tobey J -- Olson, Jeffrey J -- Van Meir, Erwin G -- Lee, Ji-Yeoun -- Wang, Kyu-Chang -- Kim, Seung-Ki -- Cho, Byung-Kyu -- Pietsch, Torsten -- Fleischhack, Gudrun -- Tippelt, Stephan -- Ra, Young Shin -- Bailey, Simon -- Lindsey, Janet C -- Clifford, Steven C -- Eberhart, Charles G -- Cooper, Michael K -- Packer, Roger J -- Massimino, Maura -- Garre, Maria Luisa -- Bartels, Ute -- Tabori, Uri -- Hawkins, Cynthia E -- Dirks, Peter -- Bouffet, Eric -- Rutka, James T -- Wechsler-Reya, Robert J -- Weiss, William A -- Collier, Lara S -- Dupuy, Adam J -- Korshunov, Andrey -- Jones, David T W -- Kool, Marcel -- Northcott, Paul A -- Pfister, Stefan M -- Largaespada, David A -- Mungall, Andrew J -- Moore, Richard A -- Jabado, Nada -- Bader, Gary D -- Jones, Steven J M -- Malkin, David -- Marra, Marco A -- Taylor, Michael D -- R01 CA163722/CA/NCI NIH HHS/ -- R01 NS096236/NS/NINDS NIH HHS/ -- R01CA148699/CA/NCI NIH HHS/ -- R01CA159859/CA/NCI NIH HHS/ -- Canadian Institutes of Health Research/Canada -- England -- Nature. 2016 Jan 21;529(7586):351-7. doi: 10.1038/nature16478. Epub 2016 Jan 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental &Stem Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario M5G 0A4, Canada. ; The Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, Ontario, Canada. ; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario M5G 0A4, Canada. ; The Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada. ; Department of Pediatric Oncology, Hematology, and Clinical Immunology, University Hospital Dusseldorf, M5S 3E1, Germany. ; Division of Neurosurgery, The Hospital for Sick Children, Toronto, Ontario M5S 3E1, Canada. ; Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5G 2M9, Canada. ; Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario M5G 2M9, Canada. ; Canada's Michael Smith Genome Sciences Centre, BC Cancer Agency, Vancouver, British Columbia V5Z 4S6, Canada. ; Department of Molecular Oncology, BC Cancer Agency, Vancouver, British Columbia V5Z 1L3, Canada. ; Center for Stem Cell &Regenerative Medicine, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. ; Clinical Genomics Research Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario 44195, Canada. ; Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada. ; School of Computing Science, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada. ; Division of Neurosurgery, Centro Hospitalar Lisboa Norte, Hospital de Santa Maria, Lisbon 1649-035, Portugal. ; Divison of Pathology, Centro Hospitalar Lisboa Norte, Hospital de Santa Maria, Lisbon 1649-035, Portugal. ; Unidade de Neuro-Oncologia Pediatrica, Instituto Portugues de Oncologia de Lisboa Francisco Gentil, Lisbon 1099-023, Portugal. ; Departments of Oncology and Neuro-Oncology, University Children's Hospital of Zurich, Zurich 8032, Switzerland. ; Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15224, USA. ; Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA. ; Brain Tumor Program, Children's Cancer Center and Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030, USA. ; Pediatric Hematology-Oncology, Children's Hospitals and Clinics of Minnesota, Minneapolis, Minnesota 55404, USA. ; Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah 84132, USA. ; A I duPont Hospital for Children, Wilmington, Delaware 19803, USA. ; Department of Neurosurgery, Kitasato University School of Medicine, Sagamihara, Kanagawa 252-0374, Japan. ; Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan. ; Department of Pathology, University of Cambridge, Cambridge CB2 1QP, UK. ; Departments of Neurosurgery, Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, California 94305, USA. ; Departments of Pediatrics, Cell &Developmental Biology, Weill Medical College of Cornell University, New York, New York 10065, USA. ; Department of Neurosurgery, NYU Langone Medical Center, New York, New York 10016, USA. ; Department of Pediatrics, Division of Pediatric Hematology, Oncology, and Stem Cell Transplantation, Columbia University, New York, New York 10032, USA. ; Department of Pediatrics-Hematology and Oncology, Rainbow Babies &Children's Hospital and Department of Pediatrics-Hematology and Oncology, Case Western Reserve, Cleveland, Ohio 44106, USA. ; Pediatric Neurosurgery, Catholic University Medical School, Rome 00198, Italy. ; Center for Neuropathology, Ludwig-Maximilians-Universitat, Munich 81377, Germany. ; Department of Pediatric Oncology, School of Medicine, Masaryk University, Brno 625 00, Czech Republic. ; AP-HP, Department of Neurosurgery, Necker-Enfants Malades Hospital, Universite Rene Descartes, Paris 75743, France. ; Signaling in Development and Brain Tumors, CNRS UMR 3347 / INSERM U1021, Institut Curie, Paris Cedex 5 91405, France. ; Division of Hematology/Oncology, British Columbia Children's Hospital, Vancouver, British Columbia V6H 3V4, Canada. ; Department of Surgery and Anatomy, Faculty of Medicine of Ribeirao Preto, Universidade de Sao Paulo, Brazil, Rebeirao Preto, Sao Paulo 14049-900, Brazil. ; Kolling Institute of Medical Research, The University of Sydney, Sydney, New South Wales 2065, Australia. ; Queensland Children's Medical Research Institute, Children's Health Queensland, Brisbane, Queensland 4029, Australia. ; Division of Oncology, Children's Health Queensland, Brisbane, Queensland 4029, Australia. ; UQ Child Health Research Centre, The University of Queensland, Brisbane 4029, Australia. ; Pediatric Neuro-Oncology Program, School of Medicine and Winship Cancer Institute, Emory University, Atlanta, Georgia 30307, USA. ; Department of Neurosurgery, School of Medicine and Winship Cancer Institute, Emory University, Atlanta, Georgia 30322, USA. ; Department of Hematology &Medical Oncology, School of Medicine and Winship Cancer Institute, Emory University, Atlanta, Georgia 30322, USA. ; Department of Neurosurgery, Division of Pediatric Neurosurgery, Seoul National University Children's Hospital, Seoul 30322, South Korea. ; Institute for Neuropathology, University of Bonn D-53105, Germany. ; Children's University Hospital of Essen D-45147, Germany. ; Department of Neurosurgery, University of Ulsan, Asan Medical Center, Seoul 05505, South Korea. ; Northern Institute for Cancer Research, Newcastle University, Newcastle upon Tyne NE1 4LP, UK. ; Departments of Pathology, Ophthalmology and Oncology, John Hopkins University School of Medicine, Baltimore, Maryland 21205, USA. ; Department of Neurology, Vanderbilt Medical Center, Nashville, Tennessee 37232-8550, USA. ; Department of Neurology, Children's National Medical Center, Washington DC 20010-2970, USA. ; Fondazione IRCCS Istituto Nazionale Tumori, Milan 20133, Italy. ; U.O. Neurochirurgia, Istituto Giannina Gaslini, Genova 16147, Italy. ; Department of Haematology &Oncology, The Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada. ; Division of Pathology, The Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada. ; Sanford-Burnham Medical Research Institute, La Jolla, California 92037, USA. ; Departments of Pediatrics, Neurology and Neurosurgery, University of California San Francisco, San Francisco, California 94158, USA. ; School of Pharmacology, University of Wisconsin, Madison, Wisconsin 53715, USA. ; Molecular &Cellular Biology Program, University of Iowa, Iowa City, Iowa 52242, USA. ; Clinical Cooperation Unit Neuropathology, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany. ; Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany. ; Department of Pediatric Oncology, University Hospital Heidelberg, Heidelberg 69120, Germany. ; Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, USA. ; Division of Hematology/Oncology, McGill University, Montreal, Quebec H2W 1S6., Canada. ; McLaughlin Centre and Department of Molecular Genetics, Banting and Best Department of Medical Research and Samuel Lunenfeld Research Institute at Mount Sinai Hospital, University of Toronto, Toronto, Ontario M5G 1L7, Canada. ; Department of Molecular Biology &Biochemistry, Simon Fraser University, Burnaby, British Columbia M5G 1L7, Canada. ; Department of Pediatrics, University of Toronto, Toronto, Ontario M5G 1X8, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26760213" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    ISSN: 0378-1119
    Keywords: (Protein-DNA interaction ; enzyme ; gel-mobility-shift assay ; restriction-modification system)
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Gene 80 (1989), S. 209-216 
    ISSN: 0378-1119
    Keywords: Chromatographie techniques ; Flavobacterium okeanokoites ; Recombinant DNA ; class-IIS restriction enzymes ; enzymatic activity ; metallic cofactors ; protein-nucleic acid interaction
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
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  • 10
    ISSN: 0378-1119
    Keywords: Protein-DNA interaction ; enzyme ; gel-mobility-shift assay ; restriction-modification system
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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