Erhöhung der Beutefang-Effektivität durch Librium (original) (raw)
1976, Naturwissenschaften
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This study investigates the enhancement of prey capture efficiency through the mechanism of Librium in specific invertebrate species. It discusses the physiological responses associated with the giant-fibre system, highlighting the role of rapid action potentials and body contractions in prey handling. The research delineates the conduction velocities of giant fibres and the behavioral implications of their activation in response to mechanical stimuli.
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Journal of Comparative Physiology A, 1991
The tarsi of the modified front legs (whips) of the whip spider Heterophrynus elaphus contain two afferent giant fibers, GN 1 and GN2, with diameters at the tibia-tarsus joint of ca. 21 ~tm and 14 ~tm, respectively. The somata of these two neurons lie in the periphery, about 25 cm away from the CNS. These two neurons are interneurons which receive mechanoreceptive inputs from approximately 750 and 1500 bristles, respectively. The receptive fields of GN1 and GN2 overlap; they extend for 40 mm (GN1) and 90 mm (GN2) along the length of the tarsus. About 90 % of the synapses onto the giant fibers are axo-axonic. Mechanical stimulation of a single bristle is sufficient to elicit action potentials in one or both interneurons. The response of the interneurons adapts quickly. Average conduction time from the soma to the CNS is 45 ms for GN1 and 55 ms for GN2. Mean conduction velocities are 5.5 and 4.2 m/s, respectively. Activity in the giant fibers does not elicit a motor response; hence the giant fibers do not mediate an escape response. Possible functions of these giant fibers are discussed and compared to those of giant fiber systems in other arthropods.
Journal of Comparative Physiology A, 1991
The front legs of the whip spider H. elaphus are strongly modified to serve sensory functions. They contain several afferent nerve fibers which are so large that their action potentials can be recorded externally through the cuticle. In recordings from the tarsus 7 different types of afferent spikes were identified; 6 additional types of afferent spikes were discriminated in recordings from the tibia and femur. Most of the recorded potentials could be attributed to identifiable neurons serving different functions. These neurons include giant interneurons and giant fibers from diverse mechanoreceptors such as slit sense organs, trichobothria, and a joint receptor. In the present report these neurons are characterized using electrophysiological and histological methods. Their functions are discussed in the context of the animal's behavior.
The neural control of contraction in a fast insect muscle
Journal of Experimental Zoology, 1975
The wing muscles used in singing by the katydid, Neoconocephalus robustus, are extraordinarily fast. At 3 5 " C , the animal's thoracic temperature during singing, an isometric twitch lasts only five to eight msec (onset to 50% relaxation) and the fusion frequency of these muscles is greater than 400 Hz. Stimulating the motornerve to a singing muscle initiates a short (2.5 msec at 3 5 " C ) , sometimes overshooting depolarization of the muscle fibers. Despite their spike-like appearance, the electrical responses are largely synaptic potentials.
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