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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 28 (1973), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The circadian petal rhythm of Kalanchoë blossfeldiana Poellniz was studied theoretically and experimentally. Results of experiments in which (i) two light pulses and (ii) repeated light pulses were given to the flowers are compared with predictions based on a previously published feedback model. In this model both the amplitude and the phase of the rhythm are affected by light pulses. Results from the present phase shift studies are shown to be in good agreement with the model.The results are also discussed in relation to a constant amplitude model like that suggested by Pittendrigh for the eclosion rhythm of Drosophila.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 32 (1885), S. 366-366 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN No. 823 of your valued paper is an article by Mr. W. Botting Hemsley on the new edition of Grisebach's “Vegetation der Erde,” closing with a reproof to editor and publisher for offering the public an old book as new. For my part I have to say that it was my strong desire to have a really new ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 30 (1974), S. 870-872 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The activities and isoenzymes of the α-naphthylacetate esterase were investigated in the sera of water frogs,Rana esculenta, Rana ridibunda, Rana lessonae, and brown frogs,Rana arvalis andRana temporaria. Furthermore the isoenzymes of the serum lactate dehydrogenase were demonstrated. Very great differences were observed between brown and water frogs. The results of the α-naphthylacetate esterase provide new evidence for the hybrid character ofRana esculenta.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 22 (1966), S. 606-608 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung BeiDrosophila pseudoobscura synchronisiert ein einmaliger Übergang von Dauerdunkel zu Dauerlicht und von Dauerlicht zu Dauerdunkel das Schlüpfen der Fliegen aus dem Puparium (Figur 2). Die Ergebnisse von Licht-Puls- und Dunkel-Puls-Experimenten lassen sich als Überlagerung solcher einfachen Stufeneffekte erklären.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1440-1441 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Serum proteins ofLacerta v. viridis, L. v. meridionalis, L. trilineata, L. agilis, L. vivipara, L. taurica, L. muralis, Ophisaurus apodus, andAnguis fragilis were separated by polyacrylamide disc electrophoresis. Among the lacertids,Lacerta viridis andLacerta trilineata show greater similiarities.Ophisaurus apodus andAnguis fragilis are characterized by praealbumins.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 332-332 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neural transmission 53 (1982), S. 213-215 
    ISSN: 1435-1463
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A 38-year old woman with a bipolar affective disorder was examined for 10 days during a serious retarded depression phase and for 10 days during the subsequent symptom-free interval. During depression the MHPG-excretion showed a significantly shorter circadian periodicity of 20.5 hours, whereas the periodicity of body temperature and VMA amounted to 24 hours. During the symptom-free interval the circadian periodicity of all parameters was 24 hours. These results indicate that the depression phase of a bipolar affective disorder in this patient is related to a desynchronization of central NA function with peripheral NA activity and body temperature.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 142 (1973), S. 329-345 
    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
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