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  • 2010-2014  (72)
  • 1955-1959  (2)
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  • 1
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    Light curve and spectral evolution of the Type IIb supernova 2011fu (2013)
    Oxford University Press
    Details
    Publication Date: 2013-04-03
    Description: We present the low-resolution spectroscopic and UBVRI broad-band photometric investigations of the Type IIb supernova (SN) 2011fu, discovered in UGC 01626. The photometric follow-up of this event was initiated a few days after the explosion and covers a period of about 175 d. The early-phase light curve shows a rise, followed by steep decay in all bands, and shares properties very similar to that seen for SN 1993J, with a possible detection of the adiabatic cooling phase. Modelling of the quasi-bolometric light curve suggests that the progenitor had an extended (~1  x 10 13 cm), low-mass (~0.1 M ) H-rich envelope on top of a dense, compact (~2  x 10 11 cm), more massive (~1.1 M ) He-rich core. The nickel mass synthesized during the explosion was found to be ~0.21 M , slightly larger than that seen for other Type IIb SNe. The spectral modelling performed with synow suggests that the early-phase line velocities for H and Fe ii features were ~16 000 and ~14 000 km s –1 , respectively. Then, the velocities declined up to day +40 and became nearly constant at later epochs.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 2
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    A connection to deep groundwater alters ecosystem carbon fluxes and budgets: example from a Costa Rican rainforest (2013)
    Wiley
    Details
    Publication Date: 2013-03-31
    Description: [1]  Field studies of watershed carbon fluxes and budgets are critical for understanding the carbon cycle, but the role of deep regional groundwater is poorly known and field examples are lacking. Here we show that discharge of regional groundwater into a lowland Costa Rican rainforest has a major influence on ecosystem carbon fluxes. This influence is observable through chemical, isotopic, and flux signals in groundwater, surface water, and air. Not addressing the influence of regional groundwater in the field measurement program and data analysis would give a misleading impression of the overall carbon source or sink status of the rainforest. In quantifying a carbon budget with the traditional " small watershed" mass-balance approach, it would be critical at this site and likely many others to consider watershed inputs or losses associated with exchange between the ecosystem and the deeper hydrogeological system on which it sits.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Interaction with plant transcription factors can mediate nuclear import of phytochrome B [Plant Biology] (2012)
    National Academy of Sciences
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    Publication Date: 2012-04-11
    Description: Phytochromes (phy) are red/far-red–absorbing photoreceptors that regulate the adaption of plant growth and development to changes in ambient light conditions. The nuclear transport of the phytochromes upon light activation is regarded as a key step in phytochrome signaling. Although nuclear import of phyA is regulated by the transport facilitators far red elongated hypocotyl 1 (FHY1) and fhy1-like, an intrinsic nuclear localization signal was proposed to be involved in the nuclear accumulation of phyB. We recently showed that nuclear import of phytochromes can be analyzed in a cell-free system consisting of isolated nuclei of the unicellular green algae Acetabularia acetabulum. We now show that this system is also versatile to elucidate the mechanism of the nuclear transport of phyB. We tested the nuclear transport characteristics of full-length phyB as well as N- and C-terminal phyB fragments in vitro and showed that the nuclear import of phyB can be facilitated by phytochrome-interacting factor 3 (PIF3). In vivo measurements of phyB nuclear accumulation in the absence of PIF1, -3, -4, and -5 indicate that these PIFs are the major transport facilitators during the first hours of deetiolation. Under prolonged irradiations additional factors might be responsible for phyB nuclear transport in the plant.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Signatures of quantum fluctuations in the Dicke model by means of Rényi uncertainty (2012)
    American Physical Society (APS)
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    Publication Date: 2012-05-11
    Description: Author(s): M. Calixto, Á. Nagy, I. Paradela, and E. Romera Rényi uncertainty relations are shown to have significant importance in quantum phase transitions. They detect the quantum phase transition in the Dicke model. The Rényi entropy sum is more appropriate for describing quantum fluctuations than the standard variance products. [Phys. Rev. A 85, 053813] Published Thu May 10, 2012
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Density and pair-density scaling for deriving the Euler equation in density-functional and pair-density-functional theory (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-09-15
    Description: Author(s): Á. Nagy A link between density and pair density functional theories is presented. Density and pair density scaling are used to derive the Euler equation in both theories. Density scaling provides a constructive way of obtaining approximations for the Pauli potential. The Pauli potential (energy) of the dens... [Phys. Rev. A 84, 032506] Published Wed Sep 14, 2011
    Keywords: Atomic and molecular structure and dynamics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    RhoB controls coordination of adult angiogenesis and lymphangiogenesis following injury by regulating VEZF1-mediated transcription (2013)
    Springer Nature
    Details
    Publication Date: 2013-11-29
    Description: Article The formation of blood and lymph vessels after injury requires precise temporal coordination. Here, the authors show that the small GTPase RhoB induces angiogenesis but inhibits lymphangiogenesis in response to dermal wounding by activating different sets of genes in blood vessels and lymphatic endothelial cells. Nature Communications doi: 10.1038/ncomms3824 Authors: Damien Gerald, Irit Adini, Sharon Shechter, Carole Perruzzi, Joseph Varnau, Benjamin Hopkins, Shiva Kazerounian, Peter Kurschat, Stephanie Blachon, Santosh Khedkar, Mandrita Bagchi, David Sherris, George C. Prendergast, Michael Klagsbrun, Heidi Stuhlmann, Alan C. Rigby, Janice A. Nagy, Laura E. Benjamin
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 7
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    Cusp relation for the Pauli potential (2014)
    American Physical Society (APS)
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    Publication Date: 2014-12-23
    Description: Author(s): H. Levämäki, Á. Nagy, K. Kokko, and L. Vitos In orbital-free density functional theory, only a Schrödinger-like equation has to be solved for the square root of the electron density. In this equation, however, there is an extra potential in addition to the Kohn-Sham potential, the so-called Pauli potential. Cusp relations are now presented for... [Phys. Rev. A 90, 062515] Published Mon Dec 22, 2014
    Keywords: Atomic and molecular structure and dynamics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Excited-state pair-density-functional theory (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-08-12
    Description: Author(s): Á. Nagy The theory of pair density is extended to excited states. The theory of a single excited state is generalized for the pair density. A two-particle equation is derived for the square root of the pair density of the given excited state. An expression for the effective potential of this equation is pre... [Phys. Rev. A 90, 022505] Published Mon Aug 11, 2014
    Keywords: Atomic and molecular structure and dynamics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Plant peptides govern terminal differentiation of bacteria in symbiosis (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-02-27
    Description: Legume plants host nitrogen-fixing endosymbiotic Rhizobium bacteria in root nodules. In Medicago truncatula, the bacteria undergo an irreversible (terminal) differentiation mediated by hitherto unidentified plant factors. We demonstrated that these factors are nodule-specific cysteine-rich (NCR) peptides that are targeted to the bacteria and enter the bacterial membrane and cytosol. Obstruction of NCR transport in the dnf1-1 signal peptidase mutant correlated with the absence of terminal bacterial differentiation. On the contrary, ectopic expression of NCRs in legumes devoid of NCRs or challenge of cultured rhizobia with peptides provoked symptoms of terminal differentiation. Because NCRs resemble antimicrobial peptides, our findings reveal a previously unknown innovation of the host plant, which adopts effectors of the innate immune system for symbiosis to manipulate the cell fate of endosymbiotic bacteria.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van de Velde, Willem -- Zehirov, Grigor -- Szatmari, Agnes -- Debreczeny, Monika -- Ishihara, Hironobu -- Kevei, Zoltan -- Farkas, Attila -- Mikulass, Kata -- Nagy, Andrea -- Tiricz, Hilda -- Satiat-Jeunemaitre, Beatrice -- Alunni, Benoit -- Bourge, Mickael -- Kucho, Ken-ichi -- Abe, Mikiko -- Kereszt, Attila -- Maroti, Gergely -- Uchiumi, Toshiki -- Kondorosi, Eva -- Mergaert, Peter -- New York, N.Y. -- Science. 2010 Feb 26;327(5969):1122-6. doi: 10.1126/science.1184057.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut des Sciences du Vegetal, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette Cedex, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20185722" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anti-Bacterial Agents/pharmacology ; Cell Division ; Cell Membrane/metabolism ; Cytosol/metabolism ; Genes, Plant ; Lotus/genetics/metabolism/microbiology ; Medicago truncatula/genetics/*metabolism/*microbiology ; Molecular Sequence Data ; Nitrogen Fixation ; Peptides/chemistry/genetics/*metabolism/pharmacology ; Plant Proteins/chemistry/genetics/*metabolism ; Plants, Genetically Modified ; Protein Transport ; Root Nodules, Plant/metabolism/microbiology ; Sinorhizobium meliloti/*cytology/drug effects/*physiology ; *Symbiosis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Copy number variation and selection during reprogramming to pluripotency (2011)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2011-03-04
    Description: The mechanisms underlying the low efficiency of reprogramming somatic cells into induced pluripotent stem (iPS) cells are poorly understood. There is a clear need to study whether the reprogramming process itself compromises genomic integrity and, through this, the efficiency of iPS cell establishment. Using a high-resolution single nucleotide polymorphism array, we compared copy number variations (CNVs) of different passages of human iPS cells with their fibroblast cell origins and with human embryonic stem (ES) cells. Here we show that significantly more CNVs are present in early-passage human iPS cells than intermediate passage human iPS cells, fibroblasts or human ES cells. Most CNVs are formed de novo and generate genetic mosaicism in early-passage human iPS cells. Most of these novel CNVs rendered the affected cells at a selective disadvantage. Remarkably, expansion of human iPS cells in culture selects rapidly against mutated cells, driving the lines towards a genetic state resembling human ES cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hussein, Samer M -- Batada, Nizar N -- Vuoristo, Sanna -- Ching, Reagan W -- Autio, Reija -- Narva, Elisa -- Ng, Siemon -- Sourour, Michel -- Hamalainen, Riikka -- Olsson, Cia -- Lundin, Karolina -- Mikkola, Milla -- Trokovic, Ras -- Peitz, Michael -- Brustle, Oliver -- Bazett-Jones, David P -- Alitalo, Kari -- Lahesmaa, Riitta -- Nagy, Andras -- Otonkoski, Timo -- England -- Nature. 2011 Mar 3;471(7336):58-62. doi: 10.1038/nature09871.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Samuel Lunenfeld Research Institute, Toronto, Ontario M5T 3H7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21368824" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Cellular Reprogramming/*genetics ; Chromosome Fragile Sites/genetics ; DNA Copy Number Variations/*genetics ; Embryonic Stem Cells/cytology/metabolism ; Fibroblasts/cytology/metabolism ; Haplotypes/genetics ; Humans ; In Situ Hybridization, Fluorescence ; Induced Pluripotent Stem Cells/cytology/*metabolism/pathology ; Mosaicism ; Mutagenesis/genetics ; Oligonucleotide Array Sequence Analysis ; Polymorphism, Single Nucleotide/genetics ; *Selection, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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