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  • 1
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    (Table S1) FMR and rock magnetic parameters for upper Paleocene to lower Eocene strata, Site Ancora (2007)
    PANGAEA
    In:  Supplement to: Kopp, Robert E; Raub, Timothy; Schumann, Dirk; Vali, Hojatollah; Smirnov, Alexei; Kirschvink, Joseph L (2007): Magnetofossil spike during the Paleocene-Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New Jersey, United States. Paleoceanography, 22(4), PA4103, https://doi.org/10.1029/2007PA001473
    Details
    Publication Date: 2024-03-23
    Description: Previous workers identified a magnetically anomalous clay layer deposited on the northern United States Atlantic Coastal Plain during the Paleocene-Eocene thermal maximum (PETM). The finding inspired the highly controversial hypothesis that a cometary impact triggered the PETM. Here we present ferromagnetic resonance (FMR), isothermal and anhysteretic remanent magnetization, first-order reversal curve, and transmission electron microscopy analyses of late Paleocene and early Eocene sediments in drill core from Ancora, New Jersey. A novel paleogeographic analysis applying a recent paleomagnetic pole from the Faeroe Islands indicates that New Jersey during the initial Eocene had a ~6°-9° lower paleolatitude (~27.3° for Ancora) and a more zonal shoreline trace than in conventional reconstructions. Our investigations of the PETM clay from Ancora reveal abundant magnetite nanoparticles bearing signature traits of crystals produced by magnetotactic bacteria. This result, the first identification of ancient biogenic magnetite using FMR, argues that the anomalous magnetic properties of the PETM sediments are not produced by an impact. They instead reflect environmental changes along the eastern margin of North America during the PETM that led to enhanced production and/or preservation of magnetofossils.
    Keywords: -; Absorption; Ancora; ARM/IRM; Coercivity of remanence; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; Factor; Leg174AX; New Jersey; Ocean Drilling Program; ODP; Ratio; Saturation isothermal remanent magnetization
    Type: Dataset
    Format: text/tab-separated-values, 219 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Magnetoreception Homing in on vertebrates (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 339-340 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Imagine being set adrift in a canoe in the middle of an ocean. Which way would you paddle? Most humans would be as lost as lost can be, but creatures such as pigeons, turtles and whales have no difficulty navigating in such circumstances. How they do so remains one of the biggest mysteries in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/36986
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrostatic enhancement of industrial drying processes (1986)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 25 (1986), S. 1027-1030 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200035a030
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sensitivity and evolution of sea-turtle magnetoreception: observations, modelling and constraints from geomagnetic secular variation (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In a series of papers, Lohmann and Lohmann (1991, 1994a, 1994b, 1996) provide evidence for remarkable sensitivity of sea-turtles to the earth's magnetic field and suggest that it is used by these animals to determine global position and to navigate. In this paper, we emphasize that a consequence of these observations taken together is that sea-turtles should be able to accurately detect the full (vector) magnetic-field, and perhaps spatial gradients. In order to interpret these observations, we propose a simple model in which the turtle is considered as a small permanent magnet, on which the geomagnetic field exerts a torque. This torque varies as a function of turtle azimuth and field parameters which depend mainly on latitude. Although this simple model accounts for some of the observational evidence, discrepancies might be due to a number of other factors, such as speed of magnetic field changes during experiments or lack of field homogeneity. Also, the earth's field has varied significantly over the last few centuries and some of the magnetic features observed today and suggested by the Lohmanns for use in sea-turtle navigation were very different or even not present two or three centuries ago. This would place constraints on the rate at which genetically inherited magnetic behavioural preferences can change with time. Alternately, it may imply that the experimental results need to be re-evaluated and complemented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1997.tb00013.x
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon-isotope events across the Precambrian/Cambrian boundary on the Siberian Platform (1986)
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 258-259 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The section studied comprises 250 m of carbonate rocks that include the Yudoma Formation of late Vendian age and the Pestrotsvet Formation of Tommotian age along the Aldan River (Dvortsy section, 57.47 N, 129.30 E, 650 km south of Yakutsk) on the Siberian Platform in Yakutia11"13. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/320258a0
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  • 6
    Electronic Resource
    Electronic Resource
    Ferromagnetism and EMFs (1995)
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 123-123 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The question of whether weak, extremely low-frequency electromagnetic fields (EMFs) can cause cancer always generates heated debate (see, for example, refs 1-3). In addition to epidemiologi-cal studies, a substantial body of literature exists on EMF stimulation of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/374123a0
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetotactic bacteria and single-domain magnetite in hemipelagic sediments (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 849-851 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Studies of hemipelagic sediments from several localities in the eastern Pacific show a maximum intensity of magnetic remanence occurring in the surface sediments1'2. Rock magnetic studies indicate a dramatic decrease of intensity with depth, correlated with a loss of the fine-grained component3'4. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321849a0
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  • 8
    Electronic Resource
    Electronic Resource
    From Mesmer to animal magnetism (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 340-340 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Over the years, many examples of sensory systems that humans apparently do not possess have popped up in interesting places among the vertebrates. Some are extensions of known senses — echolocation in bats and whales, infrasound and ultrasound detection in birds, and the sex-pheromone ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/36991
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetofossil dissolution in a palaeomagnetically unstable deep-sea sediment (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 203-206 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sediment cores collected on DSDP Leg 73 yielded some of the best magnetostratigraphic records yet obtained11, and many of the sediment samples from these cores have yielded abundant magnetofossils1'3'5'12. However, the Miocene interval from 25 to 50 m depth at site 522, which is clay-rich, gave ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339203a0
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  • 10
    Electronic Resource
    Electronic Resource
    Microwave absorption by magnetite: A possible mechanism for coupling nonthermal levels of radiation to biological systems (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 17 (1996), S. 187-194 
    Details
    ISSN: 0197-8462
    Keywords: ferromagnetic resonance ; magnetoacoustic effect ; hypersound ; cellular telephones ; EMF bioeffects ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The presence of trace amounts of biogenic magnetite (Fe3O4) in animal and human tissues and the observation that ferromagnetic particles are ubiquitous in laboratory materials (including tissue culture media) provide a physical mechanism through which microwave radiation might produce or appear to produce biological effects. Magnetite is an excellent absorber of microwave radiation at frequencies between 0.5 and 10.0 GHz through the process of ferromagnetic resonance, where the magnetic vector of the incident field causes precession of Bohr magnetons around the internal demagnetizing field of the crystal. Energy absorbed by this process is first transduced into acoustic vibrations at the microwave carrier frequency within the crystal lattice via the magnetoacoustic effect; then, the energy should be dissipated in cellular structures in close proximity to the magnetite crystals. Several possible methods for testing this hypothesis experimentally are discussed. Studies of microwave dosimetry at the cellular level should consider effects of biogenic magnetite. © 1996 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
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