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  • Fly  (1)
  • GnRH agonist  (1)
  • GnRH antagonist  (1)
  • 1
    Digitale Medien
    Digitale Medien
    A gonadotropin releasing hormone analog induces spermiation in intact and hypophysectomized frogs,Rana esculenta (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 1118-1121 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Testis ; spermiation ; gonadotropins ; GnRH agonist ; GnRH antagonist ; Amphibia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The sperm-releasing activity of a gonadotropin releasing hormone (GnRH) agonist, Buserelin (GnRH*) and hypophysis homogenate (PD) preparations was studied in intact and hypophysectomized (PDX) frogs,Rana esculenta. In addition, human chorion gonadotropin (hCG) was tested in PDX animals, and GnRH antagonist (GnRHA) treatments were carried out in intact and PDX animals, in combination with the hormonal injections. GnRH* or PD treatments were able to elicit spermiation in intact and PDX animals. While GnRH*, injected 24 h later, was again effective in inducing spermiation in intact animals, this was not the case in PDX frogs. GnRHA counteracted GnRH* effects in intact frogs. Moreover, in PDX animals GnRHA injections counteracted the spermreleasing activity induced by hCG or GnRH*, but failed to inhibit sperm-releasing activity induced by PD homogenate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01950175
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  • 2
    Digitale Medien
    Digitale Medien
    A look into the cock-pit of the fly (1976)
    Springer
    Cell & tissue research 171 (1976), S. 101-122 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Optic ganglia-lobular plate ; Fly ; Musca domestica ; Microarchitecture
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary An anatomical investigation has been carried out on the third optic ganglion of the fly, Musca domestica. Two systems of giant units, the dendritic arborizations of which are arranged orthogonally relative to each other, dominate the neuropile of this ganglion. The elements of the two systems have been reconstructed using a graphical procedure based on histological sections. One system branches predominantly in the dorsoventral direction, the other one in the anterior-posterior direction. Both systems of the giant units have a twin system composed of elements smaller in diameter and strictly parallel to the main units. The two systems have been termed the Vertical and Horizontal Systems. The elements of the two systems of fibers project into the periesophageal region where they come into contact with other descending elements. Electron microscopic investigations show that the two systems are post-synaptic at the level of the ganglion from which they originate. The horizontal system has been shown to be post and pre-synaptic in nature during its course in the mid-brain and ultimately presynaptic at its endings in the periesophageal ring. The peculiar geometric arrangement of the two anatomical systems of fibers suggests a precise function in relation to the visual world and in particular to the detection of the direction of motion. The accuracy of the structural pattern displayed by the giant units in the lobular plate seems to suggest that this optic ganglion represents the ultimate orderly projection of the external world in the brain of the fly. A short review of the electrophysiological data concerning this ganglion has been tentatively correlated with some behavioral data related to the visual orientation and fixation in insects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00219703
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