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  • Articles  (19)
  • Wiley  (9)
  • Oxford University Press  (6)
  • Nature Publishing Group  (4)
  • Physics  (19)
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  • Articles  (19)
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  • 1
    Electronic Resource
    Electronic Resource
    Plasmid-mediated tissue invasiveness in Yersinia enterocolitica (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 224-226 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Y. enterocolitica is an ubiquitous organism found primarily in the alimentary tract of warm-blooded animals, including man, and in freshwater lakes and streams9. Organisms currently regarded as Y. enterocolitica are biochemically and serologically heterogeneous9,10. Nevertheless, certain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283224a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hepatitis B virus genes and their expression in E. coli (1979)
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 575-579 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A composite DNA sequence of regions of hepatitis B virus, determined from a series of recombinant plasmids, reveals the genes for the surface antigen and the core antigen of the virus. The sequence of the core antigen shows it to be a DNA binding protein. The core antigen gene is expressed in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/282575a0
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  • 3
    Electronic Resource
    Electronic Resource
    Bird species diversity (1996)
    [s.l.] : Nature Publishing Group
    Nature 381 (1996), S. 566-566 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Graham Martin's report1 of the recent symposium on avian systematics (Avian Taxonomy from Linnaeus to DNA\ London, 23 March 1996) covered several important aspects of the debate over two different species concepts - the biological and phylogenetic - and how use of the latter might increase ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/381566a0
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  • 4
    Electronic Resource
    Electronic Resource
    In vivo binding pattern of a trans -regulator of homoeotic genes in Drosophila melanogaster (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 468-471 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Polycomb locus localizes to polytene chromosome band 78 D 7,8. The DNA encompassing the gene has been cloned by a microdissection technique (R.P., J. Lauer and D. S. Hogness, manuscript in preparation). About 4 kilobase (kb) of DNA enclose the entire PC locus, as shown by P-element-mediated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337468a0
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  • 5
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    On the potentially dramatic history of the super-Earth {rho} 55 Cancri e (2015)
    Oxford University Press
    Details
    Publication Date: 2015-05-24
    Description: We demonstrate that tidal evolution of the inner planet (‘e’) of the system orbiting the star 55 Cancri could have led to passage through two secular resonances with other planets in the system. The consequence of this evolution is excitation of both the planetary eccentricity and inclination relative to the original orbital plane. The large mass ratio between the innermost planet and the others means that these excitations can be of substantial amplitude and can have dramatic consequences for the system organization. Such evolution can potentially explain the large observed mutual inclination between the innermost and outermost planets in the system, and implies that tidal heating could have substantially modified the structure of planet e, and possibly reduced its mass by Roche lobe overflow. Similar inner secular resonances may be found in many multiple planet systems and suggest that many of the innermost planets in these systems could have suffered similar evolutions.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 6
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    Excited state mixed valence in a dual-bridged three-chromophore system (2012)
    Wiley
    Details
    Publication Date: 2012-04-15
    Description: The optical and resonance Raman spectra of the 2,2′: 6′,2″:6″,6-trioxytriphenyl-amine cation are measured and interpreted. This molecule contains two simultaneous types of coupling between three chromophores and two types of bridging atoms. The first and conventional coupling involves a single nitrogen bridge that couples all three aryl groups. The second is provided by the three oxygen atoms, each of which bridges two adjacent aryl groups. There are two bands in the visible region of the optical absorption spectrum; their assignment and the interpretation of the contributing orbitals and electronic states are described in terms of the neighboring orbital model that explains the effects of the two types of coupling. The bonding changes that take place in the excited electronic states are probed by resonance Raman spectroscopy intensities and analyzed using the time-dependent theory of resonance Raman spectroscopy. The optical absorption spectrum was fit using the measured vibrational frequencies and excited state distortions. The distortions correlate well with the bonding changes predicted by the neighboring orbital model. The resonance Raman data and neighboring orbital model analysis reveal that the two optical absorption bands correspond to charge transfers from aryl groups with different nodal structures in their pi orbitals. Copyright © 2012 John Wiley & Sons, Ltd. The three-chromophore cation (left) has a symmetric charge distribution in its ground state and three equivalent charge-bearing units in its lowest excited state. Coupling between the three units occurs through the central nitrogen and pair-wise through the oxygen. The effects of the coupling on the electronic and resonance Raman spectra are interpreted using the neighboring orbital model.
    Print ISSN: 0894-3230
    Electronic ISSN: 1099-1395
    Topics: Chemistry and Pharmacology , Physics
    Published by Wiley
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  • 7
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    Excited state mixed valence in a dual-bridged three-chromophore system (2012)
    Wiley
    Details
    Publication Date: 2012-01-27
    Description: The optical and resonance Raman spectra of the 2,2′: 6′,2″:6″,6-trioxytriphenyl-amine cation are measured and interpreted. This molecule contains two simultaneous types of coupling between three chromophores and two types of bridging atoms. The first and conventional coupling involves a single nitrogen bridge that couples all three aryl groups. The second is provided by the three oxygen atoms, each of which bridges two adjacent aryl groups. There are two bands in the visible region of the optical absorption spectrum; their assignment and the interpretation of the contributing orbitals and electronic states are described in terms of the neighboring orbital model that explains the effects of the two types of coupling. The bonding changes that take place in the excited electronic states are probed by resonance Raman spectroscopy intensities and analyzed using the time-dependent theory of resonance Raman spectroscopy. The optical absorption spectrum was fit using the measured vibrational frequencies and excited state distortions. The distortions correlate well with the bonding changes predicted by the neighboring orbital model. The resonance Raman data and neighboring orbital model analysis reveal that the two optical absorption bands correspond to charge transfers from aryl groups with different nodal structures in their pi orbitals. Copyright © 2012 John Wiley & Sons, Ltd. The three-chromophore cation (left) has a symmetric charge distribution in its ground state and three equivalent charge-bearing units in its lowest excited state. Coupling between the three units occurs through the central nitrogen and pair-wise through the oxygen. The effects of the coupling on the electronic and resonance Raman spectra are interpreted using the neighboring orbital model.
    Print ISSN: 0894-3230
    Electronic ISSN: 1099-1395
    Topics: Chemistry and Pharmacology , Physics
    Published by Wiley
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  • 8
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    The runaway instability in general relativistic accretion discs (2013)
    Oxford University Press
    Details
    Publication Date: 2013-04-03
    Description: When an accretion disc falls prey to the runaway instability, a large portion of its mass is devoured by the black hole within a few dynamical times. Despite decades of effort, it is still unclear under what conditions such an instability can occur. The technically most advanced relativistic simulations to date were unable to find a clear sign for the onset of the instability. In this work, we present three-dimensional relativistic hydrodynamics simulations of accretion discs around black holes in dynamical space–time. We focus on the configurations that are expected to be particularly prone to the development of this instability. We demonstrate, for the first time, that the fully self-consistent general relativistic evolution does indeed produce a runaway instability.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Electron beams and loss cones in the auroral regions of Jupiter (2017)
    Wiley
    Details
    Publication Date: 2017-05-26
    Description: We report on the first observations of 100 eV to 100 keV electrons over the auroral regions of Jupiter by the Jovian Auroral Distributions Experiment (JADE) onboard the Juno mission. The focus is on the regions that were magnetically connected to the main auroral oval. Amongst the most remarkable features, JADE observed electron beams, mostly upward going but also some downward going in the south, at latitudes from ~69° to 72° and ~ −66° to −70° corresponding to M-shells (“M” for magnetic) from ~18 to 54 and ~28 to 61, respectively. The beams were replaced by upward loss cones at lower latitudes. There was no evidence of strongly accelerated downward electrons analogous to the auroral “inverted V's” at Earth. Rather, the presence of upward loss cones suggests a diffuse aurora process. The energy spectra resemble tails of distributions or power laws (suggestive of a stochastic acceleration process), but can also have some clear enhancements or even peaks generally between 1 and 10 keV. Electron intensities change on time scales of a second or less at times implying that auroral structures can be of the order of a few tens of km.
    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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  • 10
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    Generation of the Jovian hectometric radiation: First lessons from Juno (2017)
    Wiley
    Details
    Publication Date: 2017-05-26
    Description: Using Juno plasma and wave and magnetic observations (JADE and Waves and MAG instruments), the generation mechanism of the Jovian hectometric radio emission is analyzed. It is shown that suitable conditions for the cyclotron maser instability (CMI) are observed in the regions of the radio sources. Pronounced loss cone in the electron distributions are likely the source of free energy for the instability. The theory reveals that sufficient growth rates are obtained from the distribution functions that are measured by the JADE-Electron instrument. The CMI would be driven by upgoing electron populations at 5–10 keV and 10–30° pitch angle, the amplified waves propagating at 82°–87° from the B field, a fraction of a percent above the gyrofrequency. Typical e -folding times of 10 −4  s are obtained, leading to an amplification path of ~1000 km. Overall, this scenario for generation of the Jovian hectometric waves differs significantly from the case of the auroral kilometric radiation at Earth.
    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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