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  • Dipole source analysis  (2)
  • 32P/33P labelling  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Phosphorus efficiency and phosphorus remobilization in two sorghum (Sorghum bicolor (L.) Moench) cultivars (1990)
    Springer
    Plant and soil 123 (1990), S. 139-145 
    Details
    ISSN: 1573-5036
    Keywords: P efficiency ; 32P/33P labelling ; P redistribution ; P solubility ; sorghum genotypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract With two sorghum cultivars differing in P efficiency a P uptake experiment (32P/33P labelling) was carried out followed by a period of P deficiency. The tendency of the total P distribution and redistribution pattern was rather similar in both sorghum cultivars. Although in the cultivar with a greater P absorbing capacity per unit root weight a higher proportion of the P was found in the inorganic P soluble fraction this is not necessarily an indication of a higher vacuolar affinity for P. Under P deficiency in both cultivars a rapid decrease of the TCA soluble P fraction in the leaves was observed. Before complete exhaustion of this fraction the TCA insoluble P fraction was also markedly reduced. In the roots the total P content was maintained fairly constant with a distinct shift in favour of the insoluble fraction occurring during the period of P deficiency. It is assumed that in the P efficient sorghum cultivar producing more dry matter per increment of P absorbed, rather inherent growth promoting factors contribute to the intraspecific P efficiency by a stimulation of the intensity of P redistribution and thus compensate for the lower P absorbing capacity of its roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011259
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dipole Source Analysis May Differentiate Benign Focal Epilepsy of Childhood with Occipital Paroxysms from Symptomatic Occipital Lobe Epilepsy (1997)
    Springer
    Brain topography 10 (1997), S. 115-120 
    Details
    ISSN: 1573-6792
    Keywords: Dipole source analysis ; Occipital EEG spikes ; BEOP ; Symptomatic occipital lobe epilepsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the study was to distinguish Benign Focal Epilepsy of Childhood with Occipital Paroxysms (BEOP) from its symptomatic counterpart on the basis of the location of the sources of the interictal EEG spikes. Patients were classified into two groups: idiopathic BEOP and symptomatic occipital lobe epilepsy. Source analysis of the averaged occipital spikes was performed using a homogeneously conducting sphere as the volume conductor model. Results showed a statistically significant difference in the eccentricity, i.e., the distance of the occipital spike focus from the centre of the head. The dipole sources of the occipital spikes in the BEOP group were found to be located more superficially than in the symptomatic group, corresponding in six of the nine cases with a source position estimated to be within the cortical layer just below the skull. The eccentricity of the symptomatic occipital spikes suggests a location deeper than the cortical layer. The results were validated in two patients from the symptomatic group. In one patient the estimated deeper dipole source location corresponded with a deeper location of spike activity observed during ECoG; in the other patient's ECoG, spike activity was observed superficially but over an extended area. The discrepancy between estimated and real location may be explained by the method of dipole source analysis used. It is concluded that the finding of a superficial dipole source location of the occipital spikes provides an indication for the diagnosis BEOP (sensitivity: 67%; specificity: 74%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022299610769
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dipole source analysis of rolandic spikes in benign rolandic epilepsy and other clinical syndromes (1993)
    Springer
    Brain topography 5 (1993), S. 203-213 
    Details
    ISSN: 1573-6792
    Keywords: Rolandic spike ; Double spike phenomenon ; Dipole source analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Dipole source analysis of rolandic spike-and-wave complexes was performed in 48 children. The estimated source of the rolandic spike, of the trough between the spike and the following slow wave, and of the slow wave appeared to have the same position but had a small significant difference in orientation. Despite the heterogeneity of associated clinical syndromes, there were no clear differences between the clinical categories of patients regarding the localization and the orientation of the sources of the rolandic spike, trough and slow wave. The presence of a second source could explain the ascending phase of the rolandic spike in 19 children. This combination of two sources corresponded with the "double-spike phenomenon" that had been found previously by sequential brain mapping and which was associated with epilepsy. The preceding spike source and the source of the rolandic spike-and-wave complex were found to have the same position but a different orientation. A hypothetical explanation is proposed in which the presence of the rolandic spike-and-wave complex alone is insufficient to account for the clinical symptomatology. Both the preceding spike source and the source of the rolandic spike-and-wave complex, representing two separate, nearby but differently oriented populations of neurones in the inferior part of the rolandic cortex, is necessary for the development of epileptic manifestations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01128988
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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