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  • 1975-1979  (2)
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  • 1
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The amount of neurosecretory material was measured in the brains of bees which had been used in a previous study (Vogel et al., 1977) for a determination of the rate of protein synthesis in the pars intercerebralis (PI). The brains of bees trained to short feeding periods contain significantly lower amounts of neurosecretory material than those of bees flying the whole day. The amount of stored material appears to decrease as the reinforcement of training is extended. The daily changes in the storage of secretory material in the PI and corpora cardiaca (CC) show no direct correlation with flying activity, either in trained or in untrained bees. Combining the data on protein synthesis with that on amounts of secretory material in the PI and CC, and taking into account the axonal flow conditions from the PI to the CC, the release of the Pi-material is estimated. These release curves correspond to the temporal activity pattern in all experimental groups.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The rate of protein synthesis by the neurosecretory cells in the pars intercerebralis and in the corpora allata was determined by autoradiography. Bees that forage throughout the day display a daily rhythm in that rate; the synthesis curve could be shifted considerably in each of two different training experiments. The total amount of protein synthesized per day is distinctly greater for bees that collect all day than for those with activity limited by the training schedule. The corpora allata also exhibit a daily rhythm in protein synthesis, and this too can be altered by training. The relationship to collecting activity are less clear than in the case of the pars intercerebralis, but are similar in direction of shift.
    Type of Medium: Electronic Resource
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