Biological Motion: Proceedings of a Workshop held in by Wolfgang Alt, Gerhard Hoffmann

By Wolfgang Alt, Gerhard Hoffmann

" . . . habit isn't, what an organism does itself, yet to what we aspect. accordingly, even if a kind of habit of an organism is sufficient as a definite configuration of hobbies, is dependent upon the surroundings during which we de­ scribe it. " (Humberto Maturana, Francisco Varela: El arbol del conocimiento, 1984) "A thorough research of habit needs to bring about a scheme, that indicates all regularities which are to be stumbled on among the sensorical enter and the motorical output of an animal. This scheme is an summary illustration of the mind. " (Valentin Braitenberg: Gehirngespinste, 1973) throughout the 70ies, while Biomathematics (beyond Biomedical statistics and Com­ puting) turned extra renowned at universities and learn institutes, the issues handled got here generally from the overall fields of 'Population Biology' and 'Complex platforms research' comparable to epidemics, ecosystems research, morphogenesis, genetics, immunology and neurology (see the 1st sequence of Springer Lecture Notes in Biomathematics). for the reason that then, the image has no longer significantly replaced, and apparently "a thorough research of habit" of unmarried organisms and, in addition, in their mutual interactions, is much from being understood. to the contrary, mathematical modellers and analysts were good­ urged to limit their investigations to express features of 'biological behavior', one in all that is 'biological motion'. formerly, just a couple of convention lawsuits or Lecture Notes have paid awareness to this significant element, the various past examples being Vol. 24: 'The size of organic form and form adjustments' (1978) or Vol.

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Additional resources for Biological Motion: Proceedings of a Workshop held in Königswinter, Germany, March 16–19, 1989

Example text

Figure 3 summarises the three shape measures applied to various shapes. With practice, it is not difficult to make a good guess at the extension, elongation and dispersion of a cell outline. 2 D I s p E 1 R s I 0 N 0 0 1 ELONGATION 2 Figure 3. Extension, dispersion and elongation are shown for var1ous geometrical shapes. Each outline is positioned so that its centroid coincides with the point determined by its elongation and dispersion. Extension increases diagonally away from the origin and values of extension are shown on the diagonal lines.

ANALYSIS OF LEUCOCYTE SHAPE CHANGES John M. K. Hansuli Keller Siegfried Eisele and Arthur Zimmermann Institute of Pathology University of Bern 3010 Bern/Switzerland Abstract The shape changes undergone by human blood lymphocytes in suspension were analysed by using morphological criteria and by calculating shape parameters of cell outlines according to the method proposed by Dunn and Brown ( 1986). The biological significance of the shape changes and the utility of the different methods are discussed.

This section). The determination of the cell centroid is a useful feature for tracking cells during locomotion and is given by: (4) 1 Xc = - LLxB(x,y), F1 (5) Yc 1 = Fl L LYB(x, y). If we wish to study the pseudopodia! kinetics of a PMN locomoting in the presence of bacteria then, in order to study pseudopod behaviour, it is necessary to decompose the cell area into its constituent parts. Thus the original cell shape may consist of several subsets, some of which may be pseudopods. It is in defining what is a pseudopod that problems arise.

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