Norman Holl

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Recent reports indicate that the exposure of brain tissues to transcranial magnetic stimulation induces persistent changes in neuronal activity and influences hippocampal synaptic plasticity. However, the modulation of synaptic efficiency by magnetic stimulation in vitro is still unclear. In the present study, we investigated whether high-frequency magnetic(More)
The mechanism by which macrophages recognize tumor cells is still unknown. We have studied interactions between rat liver macrophages and rat L 5222 leukemia cells. These tumor cells, but not normal leukocytes or erythrocytes, adhere to freshly isolated macrophages in vitro. Binding of tumor cells by macrophages can be inhibited by N-acetyl-D-galactosamine,(More)
Changes in transmission in Ia afferent and corticospinal pathways have been reported to depend on various factors including task complexity and the phase of movement. Here, we test whether a unilateral voluntary force production task leads to specific changes in both Ia afferent (by the use of the H-reflex technique) and corticospinal (by the use of(More)
Coordination as part of the stabilization process of joints is compromised in older adults. We addressed changes in neuromuscular control and force output during a ballistic force production task influenced by different environmental dynamics. Aged participants (AP) and young participants (YP) were asked to perform a unilateral maximal leg extension against(More)
Propert& of the electronically excited states of a-9-anthrylpolyenes are studied in n-hexane solutions by using optical absorption, emission and fluorescence excitation spectroscopy. The absorption spectra reveal a complex structure with contributions of both anthracene and polyene type bands but also of bands with mixed anthraoene/polyene character. Small(More)
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