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  • Astronomy
  • 2005-2009  (1.062)
  • 1995-1999  (979)
  • 1970-1974  (1)
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  • 1
    Unbekannt
    Natural Fullerenes and Related Structures of Elemental Carbon (2006)
    Dordrecht : Springer
    Details
    Schlagwort(e): Astronomy ; Chemistry, Physical organic ; Geochemistry ; Life sciences ; Planetology ; Plasma (Ionized gases)
    ISBN: 9781402041358
    URL: https://doi.org/10.1007/1-4020-4135-7
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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    E-BOOK
  • 2
    Unbekannt
    Radiation Safety Problems in the Caspian Region (2005)
    Dordrecht : Springer
    Details
    Schlagwort(e): Astronomy ; Cardiology ; Chemistry, Physical organic ; Nuclear chemistry ; Radiology, Medical
    ISBN: 9781402023781
    URL: https://doi.org/10.1007/1-4020-2378-2
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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    E-BOOK
  • 3
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    UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1999-02-19
    Beschreibung: Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones, and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bernstein, M P -- Sandford, S A -- Allamandola, L J -- Gillette, J S -- Clemett, S J -- Zare, R N -- New York, N.Y. -- Science. 1999 Feb 19;283(5405):1135-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NASA-Ames Research Center, Mail Stop 245-6, Moffett Field, CA 94035-1000, USA. mbernstein@mail.arc.nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10024233" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alcohols/chemistry ; Astronomical Phenomena ; Astronomy ; Deuterium/chemistry ; Ethers/chemistry ; *Evolution, Chemical ; *Exobiology ; Hydrogen/chemistry ; *Ice ; Mass Spectrometry ; Meteoroids ; Origin of Life ; Oxidation-Reduction ; Photolysis ; Polycyclic Hydrocarbons, Aromatic/*chemistry ; Quinones/chemistry ; Spectrophotometry, Infrared ; *Ultraviolet Rays
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    A barely tested hypothesis (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1999-12-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hogg, D W -- New York, N.Y. -- Science. 1999 Nov 26;286(5445):1679.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10610561" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; *Biological Evolution ; Selection, Genetic
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Molecules on a space odyssey (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1999-03-13
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ehrenfreund, P -- New York, N.Y. -- Science. 1999 Feb 19;283(5405):1123-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Austrian Academy of Sciences and at Leiden Observatory, Leiden, The Netherlands. pascale@strw.leidenuniv.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10075570" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; *Cosmic Dust ; Deuterium/chemistry ; Earth (Planet) ; *Evolution, Chemical ; *Exobiology ; Hydrogen/chemistry ; Ice ; Meteoroids ; Origin of Life ; Polycyclic Hydrocarbons, Aromatic/*chemistry ; Ultraviolet Rays
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Change of guard for Australian science (2008)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2008-10-10
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dennis, Carina -- England -- Nature. 2008 Oct 9;455(7214):716. doi: 10.1038/455716a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18843326" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; Australia ; Science/*organization & administration/trends ; Sex Factors ; Stem Cells
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    A longer paper gathers more citations (2008)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2008-09-19
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ball, Philip -- England -- Nature. 2008 Sep 18;455(7211):274-5. doi: 10.1038/455274a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18800099" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; *Bibliometrics ; Peer Review, Research/standards ; Publishing/*statistics & numerical data ; Research/*statistics & numerical data ; Time Factors
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    A role for self-gravity at multiple length scales in the process of star formation (2009)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2009-01-06
    Beschreibung: Self-gravity plays a decisive role in the final stages of star formation, where dense cores (size approximately 0.1 parsecs) inside molecular clouds collapse to form star-plus-disk systems. But self-gravity's role at earlier times (and on larger length scales, such as approximately 1 parsec) is unclear; some molecular cloud simulations that do not include self-gravity suggest that 'turbulent fragmentation' alone is sufficient to create a mass distribution of dense cores that resembles, and sets, the stellar initial mass function. Here we report a 'dendrogram' (hierarchical tree-diagram) analysis that reveals that self-gravity plays a significant role over the full range of possible scales traced by (13)CO observations in the L1448 molecular cloud, but not everywhere in the observed region. In particular, more than 90 per cent of the compact 'pre-stellar cores' traced by peaks of dust emission are projected on the sky within one of the dendrogram's self-gravitating 'leaves'. As these peaks mark the locations of already-forming stars, or of those probably about to form, a self-gravitating cocoon seems a critical condition for their existence. Turbulent fragmentation simulations without self-gravity-even of unmagnetized isothermal material-can yield mass and velocity power spectra very similar to what is observed in clouds like L1448. But a dendrogram of such a simulation shows that nearly all the gas in it (much more than in the observations) appears to be self-gravitating. A potentially significant role for gravity in 'non-self-gravitating' simulations suggests inconsistency in simulation assumptions and output, and that it is necessary to include self-gravity in any realistic simulation of the star-formation process on subparsec scales.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3817203/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3817203/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goodman, Alyssa A -- Rosolowsky, Erik W -- Borkin, Michelle A -- Foster, Jonathan B -- Halle, Michael -- Kauffmann, Jens -- Pineda, Jaime E -- P41 RR013218/RR/NCRR NIH HHS/ -- P41 RR013218-12/RR/NCRR NIH HHS/ -- U54 EB005149/EB/NIBIB NIH HHS/ -- U54 EB005149-05/EB/NIBIB NIH HHS/ -- U54-EB005149/EB/NIBIB NIH HHS/ -- England -- Nature. 2009 Jan 1;457(7225):63-6. doi: 10.1038/nature07609.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Initiative in Innovative Computing at Harvard, Cambridge, Massachusetts 02138, USA. agoodman@cfa.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19122636" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Algorithms ; Astronomy ; Carbon Monoxide/analysis ; Computer Simulation ; *Gravitation ; Stars, Celestial/*chemistry
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Exotic Earths: forming habitable worlds with giant planet migration (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2006-09-09
    Beschreibung: Close-in giant planets (e.g., "hot Jupiters") are thought to form far from their host stars and migrate inward, through the terrestrial planet zone, via torques with a massive gaseous disk. Here we simulate terrestrial planet growth during and after giant planet migration. Several-Earth-mass planets also form interior to the migrating jovian planet, analogous to recently discovered "hot Earths." Very-water-rich, Earth-mass planets form from surviving material outside the giant planet's orbit, often in the habitable zone and with low orbital eccentricities. More than a third of the known systems of giant planets may harbor Earth-like planets.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raymond, Sean N -- Mandell, Avi M -- Sigurdsson, Steinn -- New York, N.Y. -- Science. 2006 Sep 8;313(5792):1413-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309-0392, USA. raymond@lasp.colorado.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16960000" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; Computer Simulation ; Earth (Planet) ; *Evolution, Planetary ; Iron ; Mathematics ; *Planets ; Temperature ; *Water
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Distributed computing. Grassroots supercomputing (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2005-05-10
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bohannon, John -- New York, N.Y. -- Science. 2005 May 6;308(5723):810.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15879205" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Astronomical Phenomena ; Astronomy ; Climate ; *Computer Communication Networks ; *Computer Simulation ; *Computing Methodologies ; *Internet ; *Microcomputers ; Protein Folding ; Proteins/chemistry ; Software
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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