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  • 1
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    A low temperature transfer of ALH84001 from Mars to Earth (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2000-10-29
    Beschreibung: The ejection of material from Mars is thought to be caused by large impacts that would heat much of the ejecta to high temperatures. Images of the magnetic field of martian meteorite ALH84001 reveal a spatially heterogeneous pattern of magnetization associated with fractures and rock fragments. Heating the meteorite to 40 degrees C reduces the intensity of some magnetic features, indicating that the interior of the rock has not been above this temperature since before its ejection from the surface of Mars. Because this temperature cannot sterilize most bacteria or eukarya, these data support the hypothesis that meteorites could transfer life between planets in the solar system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weiss, B P -- Kirschvink, J L -- Baudenbacher, F J -- Vali, H -- Peters, N T -- Macdonald, F A -- Wikswo, J P -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):791-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Geological and Planetary Sciences, 170-25, California Institute of Technology, Pasadena, CA 91125, USA. bweiss@gps.caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052940" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Crystallization ; *Exobiology ; Magnetics ; *Mars ; *Meteoroids ; Temperature
    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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  • 2
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    Life in ice-covered oceans (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1999-06-26
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gaidos, E J -- Nealson, K H -- Kirschvink, J L -- New York, N.Y. -- Science. 1999 Jun 4;284(5420):1631-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geology and Planetary Sciences Division, California Institute of Technology, Pasadena 91125, USA. gaidos@gps.caltech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10383341" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Atmosphere ; Ecosystem ; *Exobiology ; Extraterrestrial Environment ; Hydrogen ; *Ice ; Iron/metabolism ; *Jupiter ; Methane/metabolism ; Oceans and Seas ; Oxidation-Reduction ; Oxygen ; Sulfur/metabolism ; 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)
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  • 3
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    Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2000-05-08
    Beschreibung: A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago. This age is a minimum for the oldest well-documented triploblastic bilaterian Kimberella. It also makes co-occurring trace fossils the oldest that are reliably dated. This determination of age implies that there is no simple relation between Ediacaran diversity and the carbon isotopic composition of Neoproterozoic seawater.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martin, M W -- Grazhdankin, D V -- Bowring, S A -- Evans, D A -- Fedonkin, M A -- Kirschvink, J L -- New York, N.Y. -- Science. 2000 May 5;288(5467):841-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. mwm@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10797002" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; Carbon Isotopes ; *Fossils ; *Geologic Sediments ; *Invertebrates ; Isotopes ; Lead/analysis ; *Paleontology ; Russia ; Seawater ; Silicates ; Uranium ; Zirconium
    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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    Paleomagnetic evidence of a low-temperature origin of carbonate in the Martian meteorite ALH84001 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1997-03-14
    Beschreibung: Indirect evidence for life on Mars has been reported from the study of meteorite ALH84001. The formation temperature of the carbonates is controversial; some estimates suggest 20 degrees to 80 degrees C, whereas others exceed 650 degrees C. Paleomagnetism can be used to distinguish between these possibilities because heating can remagnetize ferrimagnetic minerals. Study of two adjacent pyroxene grains from the crushed zone of ALH84001 shows that each possesses a stable natural remanent magnetization (NRM), implying that Mars had a substantial magnetic field when the grains cooled. However, NRM directions from these particles differ, implying that the meteorite has not been heated significantly since the formation of the internal crushed zone about 4 billion years ago. The carbonate globules postdate this brecciation, and thus formed at low temperatures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kirschvink, J L -- Maine, A T -- Vali, H -- New York, N.Y. -- Science. 1997 Mar 14;275(5306):1629-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Geological and Planetary Sciences, California Institute of Technology, 170-25, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9054354" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Carbonates/*chemistry ; Magnetics ; *Mars ; *Meteoroids ; Minerals/*chemistry ; Temperature
    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)
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  • 5
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    Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2005-01-22
    Beschreibung: The Karoo basin of South Africa exposes a succession of Upper Permian to Lower Triassic terrestrial strata containing abundant terrestrial vertebrate fossils. Paleomagnetic/magnetostratigraphic and carbon-isotope data allow sections to be correlated across the basin. With this stratigraphy, the vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permian-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ward, Peter D -- Botha, Jennifer -- Buick, Roger -- De Kock, Michiel O -- Erwin, Douglas H -- Garrison, Geoffrey H -- Kirschvink, Joseph L -- Smith, Roger -- New York, N.Y. -- Science. 2005 Feb 4;307(5710):709-14. Epub 2005 Jan 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of Washington, Seattle, WA 98195, USA. argo@u.washington.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15661973" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biodiversity ; Carbon Isotopes/analysis ; *Ecosystem ; Environment ; *Fossils ; Geologic Sediments ; Magnetics ; Plants ; South Africa ; Time ; *Vertebrates
    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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    Honeybees and magnetoreception (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1995-09-29
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kirschvink, J L -- Walker, M M -- New York, N.Y. -- Science. 1995 Sep 29;269(5232):1889.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17820244" target="_blank"〉PubMed〈/a〉
    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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  • 7
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    Pigeons have magnets (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1979-09-07
    Beschreibung: Research on pigeon homing suggests that magnetic field information is used for orientation. The ability of pigeons to sense magnetic fields may be associated with a small, unilateral structure between the brain and the skull which contains magnetic in what appears to be single domains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walcott, C -- Gould, J L -- Kirschvink, J L -- New York, N.Y. -- Science. 1979 Sep 7;205(4410):1027-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/472725" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Brain/physiology ; Columbidae/*physiology ; Head/physiology ; *Magnetics ; Orientation/*physiology
    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)
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  • 8
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    Bees have magnetic remanence (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1978-09-15
    Beschreibung: Honey bees orient to the earth's magnetic field. This ability may be associated with a region of transversely oriented magnetic material in the front of the abdomen. The magnetic moment apparently develops in the pupal state and persists in the adults.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gould, J L -- Kirschvink, J L -- Deffeyes, K S -- New York, N.Y. -- Science. 1978 Sep 15;201(4360):1026-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17743635" target="_blank"〉PubMed〈/a〉
    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)
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  • 9
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    A Candidate Magnetic Sense Organ in the Yellowfin Tuna, Thunnus albacares (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1984-05-18
    Beschreibung: Single-domain magnetite crystals have been isolated and characterized from tissue located in a sinus within the dermethmoid bone of the skull of the yellowfin tuna, Thunnus albacares. Their chemical composition, narrow size distribution, and distinctive crystal morphology indicate that these crystals are biochemical precipitates. Experiments on the interaction between particles reveal the organization of the particles in situ and suggest a possible form for candidate magnetoreceptor organelles. The consistent localization of such particles with similar arrangement within the dermethmoids of this and other pelagic fishes suggests that the ethmoid region is a possible location for a vertebrate magnetic sense organ.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walker, M M -- Kirschvink, J L -- Chang, S B -- Dizon, A E -- New York, N.Y. -- Science. 1984 May 18;224(4650):751-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17780625" target="_blank"〉PubMed〈/a〉
    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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    Palaeomagnetism of the Bayan Gol Formation, western Mongolia (1996)
    Cambridge University Press
    Details
    Publikationsdatum: 1996-07-01
    Beschreibung: Oriented samples of the Lower Cambrian Bayan Gol Formation from Salaany Gol, Mongolia, were collected at roughly 5 m stratigraphic intervals for palaeomagnetic analysis. Progressive alternatingfield and thermal demagnetization isolated two magnetic components: a present-field overprint, typically removed by 10 mT fields and ~200°C heating; and a high-coercivity, high-unblocking-temperature (550–600 °C), predominantly single-polarity component that was imparted to the rocks prior to early or middle Palaeozoic deformation. Single-polarity magnetization at Salaany Gol contrasts with results from Lower Cambrian rocks on the Siberian platform, previously considered correlative with the Bayan Gol Formation, which show a prominent change in polarity bias near the top of the Tommotian Stage. Two hypotheses can explain this discrepancy. First, the entire Bayan Gol Formation may correlate with the predominantly reversely polarized, lower half of the Tommotian Stage in Siberia. This model is consistent with plausible interpretations of δ13C profiles for the Zavkhan basin and the Siberian platform. Alternatively, the characteristic magnetic direction from our samples may be a pre-fold overprint. If post-accretionary, then comparison with Siberian palaeomagnetic results suggest a Silurian–Devonian remagnetization age, and existing bioand chemostratigraphic correlations provide the most reliable spatial and temporal links between the Zavkhan basin and the Siberian platform. If the observed magnetic directions are primary or an immediate overprint then they may be used to constrain the early Cambrian palaeogeography of the Zavkhan basin and the Palaeo-Pacific Ocean. Mean inclination of 62 ±4° corresponds to a palaeolatitude of 44 ±5°, several thousand kilometres from the equatorial Siberian craton
    Print ISSN: 0016-7568
    Digitale ISSN: 1469-5081
    Thema: Geologie und Paläontologie
    Publiziert von Cambridge University Press
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