Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung In Zellen des Subcommissuralorgans unbehandelter Wistar-Ratten und in neurosekretorischen Zellen NaCl-belasteter Teichmolche wurden voluminöse Erweiterungen der Perinuclearzisterne beobachtet, die beim Teichmolch zur Ausbildung grosser Vakuolen führen können. Perinuclearzisterne und Vakuolen enthalten ein feingranuläres, mässig elektronendichtes Material (proteinreiches Sekret). Es wird eine intranucleäre Synthese von Oligopeptiden oder Proteinen für möglich gehalten.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Antikörper produzierende («Plaque» bildende) Milzzellen von Schildkröten (Agrionemys horsfieldi Gray), die mit Hammelerythrozyten immunisiert worden waren, wurden elektronenmikroskopisch untersucht. Die Feinstruktur dieser Zellen deutet darauf hin, dass es sich um einen Zelltyp handelt, der als phylogenetischer Vorläufer der Plasmazellen von Säugetieren angesehen werden kann.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Midbrain ; Cyclostomata ; Lamprey, female ; Light- and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Im Torus semicircularis des Mittelhirns der Neunaugen lassen sich sekretorische Neurone nachweisen. Das mesenzephale neurosekretorische Zentrum entwickelt sich erst nach der Metamorphose und ist nur bei den weiblichen Tieren ausgebildet. Das Neurosekret ist ein zystinreiches Protein und läßt sich im histologischen Schnittpräparat mit allen Methoden, die zum Nachweis peptiderger Neurosekretion im Hypothalamus verwendet werden, darstellen. Produktions- und Speicherorte des Neurosekrets sind erweiterte Zisternen des rauhen endoplasmatischen Retikulums. Es existieren keine speziellen Speicherorganellen in Form der bekannten runden, einheitlich elektronendichten Elementargranula oder in Form von dense-core Vesikeln. Speicherzisternen konnten auch in den Fortsätzen der neurosekretorischen Zellen nachgewiesen werden.
    Notes: Summary In the torus semicircularis of the midbrain of lampreys a neurosecretory area was found. The mesencephalic neurosecretory nucleus develops not earlier than after metamorphosis and is only present in females. The neurosecretory material could be determined as a cystine-rich protein demonstrable in slices, with all of the methods, that are employed for the demonstration of hypothalamic neurosecretion. The neurosecretion is produced and stored in dilatated cisterns of the rough endoplasmic reticulum. No specialized storing vesicles in the form of the well-known spherical, uniformly electron-dense elementary vesicles or dense-core vesicles are present. The storing cisterns could also be demonstrated in the processes of the neurosecretory cells.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Hypothalamo-hindbrain pathway ; Rat ; Blood pressure ; Milk ejection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. In lactating rats and in rats deprived of water, the amount of neurosecretory material in the fibres of the neurosecretory hypothalamohindbrain pathway exceeds that in untreated control animals. Under these experimental conditions the pathway and its target regions can be well analysed by means of fluorescence and electron microscopic methods. 2. The axons belonging to the hypothalamo-hindbrain pathway originate from perikarya located in the caudal portion of the nucleus paraventricularis and also from a small group of perikarya in the caudo-lateral hypothalamus. On the way to the hindbrain the neurosecretory fibres join other fibre bundles of the mid- and hindbrain. 3. In the hindbrain most of the neurosecretory fibres terminate in the area of the nucleus tractus solitarii and in the area of the dorsal column nuclei. The axon terminals form synapses with other neurones. 4. Using cytochemical methods at the ultrastructural level (Naumann and Sterba, 1976), the authors were able to prove that the vesicles in the exohypothalamic fibres and in their synaptic terminals contain the same sort of material as the neurophysin vesicles in the posterior lobe of the hypophysis. 5. The most distinct increase in neurophysin was observed in lactating females which were separated from their sucklings after a normal lactation period of 15 days and killed four days thereafter, and in rats deprived of water for different time periods. 6. The relationship of the neurosecretory hypothalamo-hindbrain pathway to the nucleus tractus solitarii and to the dorsal column nuclei suggests that, functionally, there may be a correlation between the system of blood-pressure control and the milk ejection reflex.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-0878
    Keywords: Exohypothalamic neurosecretory system ; Reticular formation ; Vasotocinergic synapses ; Light and electron microscopy ; Lamprey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The octapeptide vasotocin, which is formed in the classical neurosecretory nuclei of lampreys (Petromyzonidae), is transported, bound to the carrier protein neurophysin, not only to the neurohypophysis but also to various other regions of the brain via exohypothalamic fibres. A target area of this exohypothalamic vasotocinergic system is, in the brook lamprey (Lampetra planeri Bloch), a relatively well circumscribed area in the isthmus region of the rhombencephalic tegmentum motoricum, which is called area lateralis tegmenti. In this area, which belongs to the reticular formation, the vasotocinergic fibres form synaptic contacts with nerve cell perikarya and processes. The vesicles contained in the fibres were identified, ultrahistochemically, as neurophysin vesicles. They correspond to the neurophysin vesicles observed in the neurohypophysis of the same species. The functional significance of the vasotocinergic supply to portions of the reticular formation in lampreys is open to discussion.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...