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  • 1
    Electronic Resource
    Electronic Resource
    13C-selective infrared multiple-photon decomposition study of CBrClF2 (1992)
    Springer
    Applied physics 55 (1992), S. 413-418 
    Details
    ISSN: 1432-0649
    Keywords: 82.50.-m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The infrared multiple-photon single-frequency decomposition (IRMPD) of CBrClF2 was examined as functions of laser wavenumber, laser fluence, and partial pressure of CBrClF2. The initial step was the scission of a C-Br bond. In the presence of O2 the carbon-containing product was CF2O and its subsequent hydrolysis gave CO2. The initial dissociation was highly 13C selective at wavenumbers below 1014 cm−1. CBrClF2 decomposed at relatively low fluences as compared to CHClF2. However, the decomposition yield rapidly decreased with increasing pressure. In the large-scale irradiation experiment using about 8 J pulse at 1 Hz, we obtained a carbon yield of 0.41 μmol per pulse at a 13C-atom fraction of 17% for a mixture of 10 Torr CBrClF2 and 10 Torr O2, and a carbon yield of 0.17 μmol per pulse at a fraction of 29% for a mixture of 20 Torr CBrClF2 and 20 Torr O2. The IRMPD of CHClF2 gave a carbon yield of 0.18 μmol per pulse at 48% for 10 Torr neat CHClF2 and yield of 0.25 μmol at 52% for 20 Torr CHClF2. The large-scale irradiation experiment was also carried out for mixtures of CBr2F2 and O2. CHClF2 is the most productive of 13C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325179
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous atlantoaxial portions of vertebral and posterior inferior cerebellar arteries (1985)
    Springer
    Neuroradiology 27 (1985), S. 410-413 
    Details
    ISSN: 1432-1920
    Keywords: Vertebral artery ; myelography ; spinal canal ; cranial artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a review of the vertebral angiograms of 300 patients free from disease at the craniovertebral junction, we found atlantoaxial arterial anomalies in 2,3%. These were: 2 cases in which the vertebral artery ran in the spinal canal below C1, 3 cases of duplication of the vertebral artery above and below C1, and 2 cases of origin of the posterior inferior cerebellar artery at C2. Although these arteries ran in the spinal canal between C1 and C2, they never encroached upon the posterior third of the canal. From the survey of another 21 patients having bony abnormalities at the craniovertebral junction, the first type of arterial anomaly described above was seen in 4 patients and associated with failure of segmentation of the embryonic sclerotome such as occipitalization of the atlas or Klippel-Feil syndrome. It is possible to relate the development of these anomalous vessels to malarrangement of the embryonic segmental arteries. Our results indicate that one must be cautious with lateral C1/2 puncture or surgical exposure of the region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327604
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    Paper (German National Licenses)
    Fulltext
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