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Digitale Medien

Macrophages overcome mycoplasma infections of cells in vitro (1980)

Schimmelpfeng, L. ; Langenberg, U. ; Hinrich Peters, J.

[s.l.] : Nature Publishing Group

Nature 285 (1980), S. 661-662

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Three different preparations of mouse macrophages were used with identical success: peritoneal macrophages actuated by thioglycollate, the same preparation kept as frozen stock before use (frozen in 90% serum plus 10% dimethyl sulphoxide), and macrophages grown in vitro from bone marrow precursors ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/285661a0

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Digitale Medien

Sinusoidal forearm tracking with delayed visual feedback I. Dependence of the tracking error on the relative delay (1998)

Langenberg, U. ; Hefter, H. ; Kessler, K. R. ; [weitere]

Springer

Experimental brain research 118 (1998), S. 161-170

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ISSN: 1432-1106

Schlagwort(e): Key words Visuomotor tracking ; Sensorimotor integration ; Delayed visual feedback ; Tracking error ; Control-display compatibility

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract During forearm tracking of a sinusoidally moving target matching of proprioceptive and visual feedback was altered by introducing different visual delays. In five normal subjects seven target frequencies were tested ranging from 0.3 to 1.5 Hz. For each target frequency nine different delays were used ranging from 0 to 120% of the cycle duration with target frequency and delay being varied randomly. Tracking error revealed a cyclic behaviour with an increase up to delays of about 50% of the target cycle duration and an improvement for delays larger than 50%. Modulation of response frequency was less pronounced compared with tracking error variation but also was dependent on relative phase. The response frequency matched the target frequency at delays of 0 and 100% of cycle duration and was slightly lower than the target frequency with relative delays of about 50%. The introduction of a visual delay during sinusoidal forearm tracking leads to a spatial in addition to the temporal mismatch between proprioception and vision. The temporal and the spatial incompatibility influence the tracking performance differentially.