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  • 1
    Electronic Resource
    Electronic Resource
    Opioid binding in the rostral hypothalamus is reduced following lesion of the ventral noradrenergic tract in female rats (1991)
    Springer
    Experimental brain research 85 (1991), S. 230-234 
    Details
    ISSN: 1432-1106
    Keywords: Preoptic area ; Opioid binding ; Diprenorphine ; Noradrenergic transmission ; Ventral noradrenergic tract lesion ; Autoradiography ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Experiments were undertaken to establish whether opioid receptors exert a direct presynaptic influence on noradrenergic (NA) terminals in the preoptic/ anterior hypothalamus (PO/AH) of the female rat. Thus, opioid binding studies were performed in rats with lesions of the ventral NA tract (VNAT; the main NA projection to the hypothalamus) to assess whether a loss of NA terminals may also result in a decrease in opioid binding in the PO/AH. In the first experiment, unilateral electrolytic lesions of the VNAT caused a significant reduction in both the NA content and specific [3H]-diprenorphine binding to membrane homogenates in the ipsilateral PO/AH. In the second experiment bilateral 6-hydroxydopamine (6-OHDA)-induced lesions of the VNAT caused a significant reduction in NA levels in the PO/AH as well as significant decreases in the density of [3H]-diprenorphine binding to tissue sections of the PO/AH when compared to control animals. These results strongly suggest that the NA input to the PO/AH is regulated by endogenous opioid peptides, and provide an anatomical substrate to explain opioid-NA interactions in the control of gonadotrophin releasing hormone (GnRH) and gonadotrophin secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230005
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of a diploid, apomictic plant of Hieracium aurantiacum (1997)
    Springer
    Sexual plant reproduction 10 (1997), S. 168-172 
    Details
    ISSN: 1432-2145
    Keywords: Key words Apomoxis ; Apospory ; Diploid ; Hieracium aurantiacum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  As in most taxa that contain gametophytic apomicts, all of the apomictic biotypes studied so far in the genus Hieracium subgenus Pilosella have been recorded as polyploids. As part of a study of variation in apomictically derived populations of H. aurantiacum, a diploid plant was identified. Apospory, the mechanism of apomixis typically observed in this taxon, was observed in this plant. Unreduced megagametophytes at various developmental stages were commonly observed in the developing ovules, and endosperm formation was autonomous. The eventual seed set, however, was low. This appears to have been due to the proliferation of competing megagametophytes and embryos within each ovule. Pollen sterility was also observed, primarily resulting from the dysfunction of microgametogenesis at the uninucleate stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050084
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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