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  • 1
    Digitale Medien
    Digitale Medien
    Facilitation of somatosensory evoked potentials by exploratory finger movements (1993)
    Springer
    Experimental brain research 95 (1993), S. 330-338 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Somatosensory processing ; Somatosensory ; evoked potentials ; Microneurography ; Movement ; Human
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Modification of somatosensory processing depending on the behavioral setting was studied. Active alternating movements of the fingers, passive tactile stimuli to the hand, and active exploration of objects were performed during recording of somatosensory evoked potentials (SEPs). SEPs were elicited by compound electrical median nerve stimulation and electrical stimulation at detection threshold of cutaneous median nerve fascicles identified by microneurography. Electrical stimulation was not time-locked to the studied condition. In comparison with SEPs at rest there was attenuation of early cortical potentials up to 25 ms post-trigger in all nonresting conditions. In stimulation of the compound median nerve as well as of isolated cutaneous fascicles of a hand actively exploring an object there was an additional increased negativity, peaking at 28 ms. This facilitory effect was independent of attentional focusing and was absent during exploration using the ipsilateral, non-electrically stimulated hand. In patients with parietal lesions the facilitatory effect was diminished on the affected side. Spline interpolated brain maps at this latency based on 32channel recordings in healthy volunteers showed a shift of local contralateral positive maximum from frontal to parietal during exploration, indicating enhancement of a tangential dipole. It is suggested that in conditions involving close sensorimotor interaction such as exploratory hand movements there is preactivation of a cortical area which is located in the central sulcus and receives cutaneous somatosensory inputs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00229790
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Chiroptical detection. Novel possibilities of its application to enantiomers (1988)
    Springer
    Chromatographia 25 (1988), S. 182-188 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Detection, chiroptical, polarimetric, circular dichroic ; Enantiomers ; Sorbents, optically active
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Polarimetric and/or circular dichroic detection of enantiomers after liquid chromatography on optically active sorberts has been used for the following purposes: determination of enantiomeric purity in spite of peak overlap, investigation of enantiomerization during chromatography, monitoring of racemizations and recording of circular dichrograms without preparative enrichment of enantiomers. Novel examples for all applications are give. The general prospects for chiroptical detection are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02316442
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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