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  • 1
    Electronic Resource
    Electronic Resource
    MRI anatomy of white matter layers around the trigone of the lateral ventricle (1998)
    Springer
    Neuroradiology 40 (1998), S. 477-482 
    Details
    ISSN: 1432-1920
    Keywords: Key words Brain ; anatomy ; Brain ; white matter ; Brain ; oedema ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract MRI was obtained in eight normal volunteers and seven patients with brain oedema around the trigone. In addition to the conventional sequences, diffusion-weighted and intravoxel-incoherent-motion images using motion-proving anteroposterior and/or lateral direction gradients were obtained to show the white matter pathways better. Coronal proton-density-weighted images showed three thin relatively high-intensity layers in addition to the tapetum and the internal and external sagittal strata. Although they have not been confirmed anatomically, the thin layer between the internal and the external sagittal strata was corroborated by diffusion-weighted and intravoxel-incoherent-motion images, and by characteristics of the spread of oedema into the sagittal stratum. We propose that this layer be named the central sagittal lamina. The other two layers medial and lateral to the sagittal stratum were outside, but in contact with the medial and lateral parts of the sagittal stratum, respectively. We provisionally named them medial and lateral sagittal laminae; they were not evident on any other images. The low-intensity layer on T2-weighting was the internal sagittal stratum. The optic radiation, comprising the external sagittal stratum, appeared as an intermediate to slightly high-intensity layer on T2-weighted images and a low-intensity layer on T1-weighted images as did the corticospinal tract in the posterior internal capsule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050629
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  • 2
    Electronic Resource
    Electronic Resource
    Dilated Virchow-Robin spaces: MRI pathological study (1998)
    Springer
    Neuroradiology 40 (1998), S. 27-31 
    Details
    ISSN: 1432-1920
    Keywords: Key words Brain ; anatomy ; Magnetic resonance imaging ; threedimensional ; Virchow-Robin spaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We performed a histopathological study of two human brains to look at dilated Virchow-Robin (V-R) spaces in the anterior perforated substance and putamen. We measured the diameter of 74 arteries in 54 dilated V-R spaces. In 28 patients without neurological deficits we ascertained the characteristic location of dilated V-R spaces in the anterior perforated substance and basal ganglia on MRI, measuring the distance from 64 foci of cerebrospinal fluid signal intensity to the centre of the mamillary body on 1 mm thick images. In the histopathological study, the mean diameter of the arteries was 39.0 ± 36.0 μm. Dilatation of the V-R space was observed from the end of the indentation of the pial membrane towards the brain surface along the perforating artery. In the MR images, the mean distance from the dilated V-R space to the mamillary body was 10.0 ± 4.5 mm. The V-R space was confined to a fixed level in the lower part of the basal ganglia, and not found near the brain surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050533
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reversed-phase thin-layer chromatography of the rare earth elements (1988)
    Springer
    Chromatographia 25 (1988), S. 989-992 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Reversed-phase chromatography ; Rare earth elements ; Bonded reversed-phase silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Partition chromatographic behaviour of the rare earth elements on C18 bonded silica reversed-phase material has been investigated by thin-layer chromatography in methanol — lactate media. The rare earth lactato complexes are distributed and fractionated on bonded silica layers without ion-interaction reagents. The concentration and pH of lactate solution, methanol concentration and temperature have effects on the migration and resolution of the rare earth elements. The partition system is particularly suited to separate adjacent rare earths of middle atomic weight groups, allowing the separation of gadolinium, terbium, dysprosium, holmium, erbium and thulium to be achieved by development to 18 cm distance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259417
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Reversed-phase chromatgraphic separation of the rare earth elements (1990)
    Springer
    Chromatographia 29 (1990), S. 579-582 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Dynamic ion-exchange ; Rare earth elements ; Lactate complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chromatographic behaviour of the rare earth elements on C-18 bonded silica reversed-phase material has been investigated in aqueous lactate media. The lactatocomplexes of the rare earths are distributed and fractionated on the bonded silica column by a mobile phase gradient technique in the presence of hydrophobic ions. The effects of the lactate concentration pH, methanol and hydrophobic ion concentrations in the eluents have been investigated in detail to have the best resulution of the adjacent rare earth elements. Port-column reaction with arsenazo(III) is used to detect the separated rare earth lactatocomplexes. This reversed-phase partition system is suited to separate and detect all rare earth elements within 40 min with good reproducibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261226
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    Paper (German National Licenses)
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