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  • 1
    Electronic Resource
    Electronic Resource
    Small-scale clumping in molecular clouds (1989)
    Springer
    The astronomy and astrophysics review 1 (1989), S. 141-176 
    Details
    ISSN: 1432-0754
    Keywords: molecular clouds ; star formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary This review consists of five sections. In the introduction, we briefly review the development of the study of molecular clouds. In the second section, we review the theories of molecular cloud structure and compare these predictions with the statistical properties of the clouds. In Sect. 3 we give an overview of current approaches to determinations of mass and local density in clouds. In the fourth part, we discuss the observations of a selected sample of individual sources. The emphasis here is on high resolution studies of regions of star formation. The final section contains a discussion of instrumental limitations and mentions some future developments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872714
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular scene analysis: the integration of direct-methods and artificial-intelligence strategies for solving protein crystal structure (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 168-178 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A knowledge-based approach to crystal structure determination is presented. The approach integrates direct-methods and artificial-intelligence strategies to rephrase the structure determination process as an exercise in scene analysis. A general joint probability distribution framework, which allows the incorporation of isomorphous replacement, anomalous scattering and a priori structural information, forms the basis of the direct-methods strategies. The accumulated knowledge on crystal and molecular structures is exploited through the use of artificial-intelligence strategies, which include techniques of knowledge representation, search and machine learning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090744499200917X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vasopressins and the Increase of Water and Electrolyte Excretion by Sheep, Cattle and Camels (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 979-981 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Camels and Merino sheep under tropical arid conditions are more sensitive to the action of vasopressin than cattle, dogs or men. The hormone increases the output of potassium from the kidney even when the animals are artificially depleted of potassium. Arginine vasopressin has the same effect on ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214979a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Detection of strong methanol masers towards galactic H II regions (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 49-51 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations were carried out in July 1985 and April-May 1986 with the National Radio Astronomy Observatory (NRAO) 140-foot telescope in Green Bank. In July 1985, the data were acquired using a double-beam-switching technique. Total power mode or frequency switching was used during the 1986 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326049a0
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon chain molecules in interstellar clouds (1979)
    Springer
    Astrophysics and space science 65 (1979), S. 83-93 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A survey of the distribution of long carbon chain molecules in interstellar clouds shows that their abundance is correlated. The various formation schemes for these molecules are discussed. We conclude that the ion-molecule type formation mechanisms are more promising than their competitors. They have also the advantage of allowing predictions which can be tested by observations. Acetylene C2H2 and diacetylene HCCCCH, may be very abundant in interstellar clouds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643491
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The massive hot core associated with G31.41+0.31 (1995)
    Springer
    Astrophysics and space science 224 (1995), S. 173-175 
    Details
    ISSN: 1572-946X
    Keywords: Molecular Lines ; Hot Core ; Massive Star Formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have used the IRAM Plateau de Bure Interferometer to observe the ground state and vibrationally excited lines of Methyl Cyanide towards the UCHII region G31.41+0.31. We also obtained a map of the continuum emission at a frequency of 110 GHz. We detect a hot molecular core in the emission both of methyl cyanide and of the 110 GHz continuum. We estimate a temperature of 200 K and a mass of 1000 M⊙ for this compact massive region. We also detect a velocity gradient or shift across the methyl cyanide core whose origin could be due to rotation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00667840
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of a collapsing protostar (1994)
    Springer
    Astrophysics and space science 212 (1994), S. 139-145 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc. The collapse began about 1.5 × 105 years ago, similar to the onset of the outflow. The mass accretion rate is about 10 times the outflow rate, and about 0.4M ⊙ should have now accumulated in the star and disk. Because B335 rotates only very slowly, any disk would still be very small (about 3 AU). The accretion luminosity should be adequate to power the observed luminosity. Consequently, we believe that B335 is indeed a collapsing protostar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984517
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