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  • 1
    Electronic Resource
    Electronic Resource
    Spaltung von 2-Phenylpropan-1-ol-und 2-Phenylpropan-2-ol-Glucuronid, zweier Metaboliten des Isopropylbenzol (Cumol) (1986)
    Springer
    International journal of legal medicine 97 (1986), S. 83-88 
    Details
    ISSN: 1437-1596
    Keywords: Cumene, metabolites ; Isopropylbenzene, metabolites ; Cumol, Metaboliten ; Isopropylbenzol, Metaboliten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Zusammenfassung Es wird über das Verhalten von 2-Phenylpropan-1-ol (I) und 2-Phenylpropan-2-ol (II) (beide sind Metaboliten von Cumol) und ihrer Glucuronide gegenüber HCl berichtet. Während I eine hohe Säurebeständigkeit aufweist, erfährt II eine Umwandlung in 2-Phenylpropen (III), aus dem durch Folgereaktionen zahlreiche Produkte entstehen. Die glykosidische Bindung des I-Glucuronides wird mit 10,0% HCl quantitativ gespalten, wobei eine Aglykonausbeute von nahezu 100% erzielt wird. Anders verhält sich das II-Glucuronid: die Wiederfindungsraten an II liegen mit nur 40 bis 45% im gesamten HCl-Konzentrationsbereich (1,0% bis 20,0%) sehr niedrig, obwohl schon mit 1,0% HCl eine Hydrolyserate des Glucuronides von 100% erreicht wird.
    Notes: Summary The behaviour of 2-phenyl-1-propanol (I) and 2-phenyl-2-propanol (II) and their glucuronides with HCl has been investigated. While I shows a high acidic constancy, II undergoes a partial conversion into 2-phenylpropane (III) which itself yields numerous products. The glucosidic bond of glucuronide I is quantitatively split by 10.0% HCl, whereby an aglucone yield of nearly 100% is obtained. The second glucuronide behaves otherwise: the recovery of II is very low (only 40% to 45%) with HCl concentrations of 1.0%–20.0%, although with 1.0% HCl 100% of the glucuronide is hydrolysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204440
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  • 2
    Electronic Resource
    Electronic Resource
    Observations of the solar wind from coronal holes (1994)
    Springer
    Space science reviews 70 (1994), S. 319-330 
    Details
    ISSN: 1572-9672
    Keywords: Sun ; Solar Wind ; Coronal Holes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The solar wind emanating from coronal holes (CH) constitutes a quasi-stationary flow whose properties change only slowly with the evolution of the hole itself. Some of the properties of the wind from coronal holes depend on whether the source is a large polar coronal hole or a small near-equatorial hole. The speed of polar CH flows is usually between 700 and 800 km/s, whereas the speed from the small equatorial CH flows is generally lower and can be 〈400 km/s. At 1 AU, the average particle and energy fluxes from polar CH are 2.5×108 cm−2 sec−1 and 2.0 erg cm−2 s−1. This particle flux is significantly less than the 4×108 cm−2 sec−1 observed in the slow, interstream wind, but the energy fluxes are approximately the same. Both the particle and energy fluxes from small equatorial holes are somewhat smaller than the fluxes from the large polar coronal holes. Many of the properties of the wind from coronal holes can be explained, at least qualitatively, as being the result of the effect of the large flux of outward-propagating Alfvén waves observed in CH flows. The different ion species have roughly equal thermal speeds which are also close to the Alfvén speed. The velocity of heavy ions exceeds the proton velocity by the Alfvén speed, as if the heavy ions were surfing on the waves carried by the proton fluid. The elemental composition of the CH wind is less fractionated, having a smaller enhancement of elements with low first-ionization potentials than the interstream wind, the wind from coronal mass ejections, or solar energetic particles. There is also evidence of fine-structure in the ratio of the gas and magnetic pressures which maps back to a scale size of roughly 1° at the Sun, similar to some of the fine structures in coronal holes such as plumes, macrospicules, and the supergranulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00777887
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    Paper (German National Licenses)
    Fulltext
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