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  • 1
    ISSN: 1432-1106
    Keywords: Key words Posture ; Center of mass ; Trunk orientation ; Microgravity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  In the present experiments carried out in microgravity two questions were addressed. First, when the subject was instructed to adopt a vertical erect posture in microgravity with his feet fixed to the floor of the space cabin, would he control anteroposterior position with respect to the ankle joint axis of the ”vertical projection” of his center of mass (CM) or trunk axis orientation with respect to the ”vertical” (perpendicular to the floor of the space cabin)? Secondly, is CM anteroposterior position regulated during upper trunk movements in microgravity, in the absence of equilibrium constraint? Two subjects were tested in a long-term space flight. Video camera recordings were performed and analyzed off line. The results show that during erect vertical posture in microgravity, the trunk axis with respect to the ”vertical” is inclined some 7° forward. The anteroposterior position of the CM ”vertical” projection is not shifted forward, as might be expected in view of the trunk inclination, but remains close to the ankle joint axis. At the end of the upper trunk forward or backward bending movement, the final position of the vertical CM projection remains close to the ankle joint axis in microgravity. These results are interpreted as indicating that CM anteroposterior position continues to be accurately controlled in microgravity; the forward inclination of the trunk axis observed in microgravity is interpreted as being due to a misevaluation of the ”vertical” axis on the basis of biased information from proprioceptive inputs.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary With a new method the flow of liquid transmitted from one individual to another during food exchange between members of an ant society can be observed continuously. During the exchange, the radioactivity of the honey in the crop of an individual is measured and printed on a recorder. When complemented with other methods, and particularly by direct observation, interesting data are supplied by this technique.
    Notes: Resume La nouvelle méthode permet de suivre, de manière continue, le flux- de substance transmise d'un individu à l'autre, au cours d'un échange alimentaire entre membres d'une société de Fourmis. La radio-activité du miel contenu dans le jabot d'un individu est mesurée durant l'échange, et inscrite sur un enregistreur. Complétée par les autres méthodes et en particulier par l'observation directe, cette technique fournit des données intéressantes.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Des états de mal, durant de 3 à 7 h 30 sont provoqués par la bicuculline chez 3 babouins adolescents, immobilisés par de la gallamine et ventilés artificiellement. La tension artérielle et le débit cérébral sont augmentés pendant la première partie de la crise et redeviennent normaux secondairement. Des lésions ischémiques sont observées dans la zone fragile de l'hippocampe (zone de Sommer) et dans le cortex mais le cervelet reste indemne.
    Type of Medium: Electronic Resource
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