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  • 1
    Electronic Resource
    Electronic Resource
    Morphology and response characteristics of neurones in the deutocerebrum of the brain in the honeybeeApis mellifera (1989)
    Springer
    Journal of comparative physiology 164 (1989), S. 483-494 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neurones restricted to the deutocerebrum of the brain of the honeybee are examined using intracellular recording and staining techniques and are classified according to their morphological characteristics. Three morphological categories of deutocerebral neurones were identified and their physiological properties are investigated. 1. A non parametric approach is used to provide a general classification of the responses recorded in this study and to compare the response patterns of deutocerebral neurones belonging to different morphological categories. A more detailed analysis is used to investigate trends within and between populations of deutocerebral neurones grouped according to their morphological characteristics, or according to the type of stimulation applied to the animal. 2. None of the cells recorded in this study responded to simple visual stimulation (a light flash). However, many cells responded to one or more of the three forms of antennal stimulation used (a puff of rose scent, a puff of air and a puff of the alarm pheromone isoamylacetate) and certain neurones responded differently to each of these three forms of antennal stimulation. The most common response to all antennal stimuli was an increase in the frequency of action potentials recorded at the onset of the stimulus. Some variation in the response patterns of neurones innervating different regions of the antennal lobe was revealed. However, it was not possible to predict the morphology of deutocerebral neurones based upon their background frequency of action potentials, their response characteristics, or the latency of their responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00610442
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in brain amine levels associated with the morphological and behavioural development of the worker honeybee (1992)
    Springer
    Journal of comparative physiology 170 (1992), S. 715-721 
    Details
    ISSN: 1432-1351
    Keywords: Honeybee brain ; Dopamine ; Serotonin ; Behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Changes in biogenic amine levels associated with the morphological and behavioural development of the worker honeybee are examined. A significant increase in amine levels in the head of the honeybee is associated with transition from the larval to pupal stage. Adult emergence is also accompanied by a significant increase in 5-HT levels in the brain, but no significant change in brain dopamine (DA) levels. NADA (N-acetyldopamine) levels increase during larval and pupal development, but in contrast to both DA and 5-HT, drop significantly during the transition from pupa to adult. Levels of DA in the brain of nectar and pollen forager bees, presumed to be among the oldest adults sampled, were found to be significantly higher than in nurses, undertakers or food storers. These results suggest that an age-dependent change in amine levels occurs in the brain of the worker bee. In the optic lobes, levels of DA and 5-HT were found to be significantly higher in pollen forager bees than in all other behavioural groups. Significant differences in amine levels in the optic lobes of nectar foragers and pollen foragers indicate that some differences in amine levels occur independent of worker age. The functional significance of differences in brain amine levels and whether or not biogenic amines play a direct role in the control of honeybee behaviour has yet to be established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198982
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Innervation of the intestine in the bivalve mollusc Chione stutchburyi (1981)
    Springer
    Cell & tissue research 218 (1981), S. 191-207 
    Details
    ISSN: 1432-0878
    Keywords: Axons ; Synaptic vesicles ; Dopamine ; Serotonin ; Mollusca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The innervation of the gut of the venerid bivalve mollusc, Chione stutchburyi, has been examined by fluorescence histochemistry, electron microscopy and autoradiography. Specific green and yellow varicose fluorescent fibres indicate the presence of dopaminergic and serotonergic axons, respectively. Three different types of axons can be distinguished by the morphological characteristics of their vesicles. Type I axons contain predominantly small granular vesicles (average diameter 65 nm), Type II axons possess large granular vesicles (average diameter 100 nm) and Type III axons contain large opaque vesicles (average diameter 150 nm). The granular vesicles in both Types I and II axons react positively to dichromate, and their granularity is reduced by reserpine indicating that they are monoaminergic. Only Type I axons accumulate tritiated dopamine and are selectively damaged by 6-hydroxydopamine. It is concluded that Type I axons are dopaminergic. Type II axons are serotonergic: they alone take up tritiated 5-hydroxytryptamine, and 5,7-dihydroxytryptamine selectively causes degenerative changes in these axons. Type III axons contain an unidentified neurotransmitter substance. The large opaque vesicles of these axons do not react to dichromate and are unaffected by reserpine, 6-hydroxydopamine or 5,7-dihydroxytryptamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210104
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    Paper (German National Licenses)
    Fulltext
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