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Tight turns in stick insects

Author: Schmitz Josef ; https://orcid.org/
Stübner Sebastian
Ehmanns Ingo
Cruse Holk
Publication venue
Publication date: 01/01/2009
Field of study

Cruse H, Ehmanns I, Stübner S, Schmitz J. Tight turns in stick insects. Journal of Comparative Physiology A. 2009;195(3):299-309.We investigated insects Carausius morosus walking whilst hanging upside down along a narrow 3 mm horizontal beam. At the end of the beam, the animal takes a 180 degrees turn. This is a difficult situation because substrate area is small and moves relative to the body during the turn. We investigated how leg movements are organised during this turn. A non-contact of either front leg appears to indicate the end of the beam. However, a turn can only begin if the hind legs stand in an appropriate position relative to each other; the outer hind leg must not be placed posterior to the inner hind leg. When starting the turn, both front legs are lifted and usually held in a relatively stable position and then the inner middle leg performs a swing-and-search movement: The leg begins a swing, which is continued by a searching movement to the side and to the rear, and eventually grasps the beam. At the same time the body is turned usually being supported by the outer middle leg and both hind legs. Then front legs followed by the outer middle leg reach the beam. A scheme describing the turns based on a few simple behavioural elements is proposed

Publications at Bielefeld University

The CB-ELSA experiment

Author: Ehmanns A
Publication venue
Publication date: 01/01/2000
Field of study

The Crystal Barrel detector used before at LEAR (CERN) has been modified and installed at the electron stretcher accelerator (ELSA) in Bonn. It will be used to study photo- and electro-production of neutral mesons. One of the major aims of this experiment is the search for missing baryon resonances and to achieve a better understanding of the baryon spectrum. First data from test runs at low energy (250 MeV<E/sub gamma /<800 MeV) show photoproduction of pi /sup 0/ and of 2 pi /sup 0/-pairs. (3 refs)

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