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  • 1975-1979  (46)
  • 1955-1959  (6)
  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 430-431 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Capillary gas- Chromatographie separation of extracts from female gametophytes of Laminaria digitata. a, normal alkanes ranging from heptane to nonadecane separated in identical conditions; b, 3-d-old suspension without eggs, extracted for 22.5 h ; c, suspension containing 8.7 x 10 eggs, ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of wildlife research 1 (1955), S. 32-33 
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 3
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The23Na NMR first order quadrupolar satellite lines are detected and studied in AgNa(NO2)2 single crystals near the paraelectric-ferroelectric phase transition. Although the intensities of the satellites are small the components of the electric field gradient tensor (EFG) at the23Na sites could be deduced from the angular dependence of the first order quadrupolar line splitting with respect to rotations around the three crystallographic axes by applying the Volkoff method. In the paraelectric phase the principal axes system of the EFG coincides with the crystallographic axes system whereas in the ferroelectric phase there is a strongly temperature dependent small non diagonal elementφ xz (T). The EFG principal componentsφ xx andφ yy are strongly influenced whereas the EFG principal componentφ zz is nearly not affected by the ferroelectric phase transition. The observed temperature dependences of the EFG components are related to the temperature variation of the normalized spontaneous polarizationS(T) by assuming a coupling term which is quadratic inS(T). Finally the problem of the intensities of the satellite lines is discussed.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 32 (1978), S. 83-91 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pulse and wide line NMR spectroscopy were applied to small ferroelectric NaNO2 particles, produced from aqueous solution and embedded loosely in silicagel. Mean particle diameters as determined by SEM and TEM were between 0.2 and 5.0 µm. From the cw-experiments it followed, that the particles had the crystalline structure of the bulk. It is shown that the spectrum of critical fluctuations and the phase transition temperature in the particles proved to be independent of the size. If there is a “dead layer” at the particle surfaces its thickness does not exceed 1×10−2µm.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 15 (1959), S. 158-159 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Quantitative roentgen-histo-radiographic dry-weight determinations were made without a reference system. The results were compared to readings which had been obtained by the interference microscope. The readings from both methods correspond. The results show the range of error for both methods. It is remarkable that roentgenhisto-radiographic dry-weight determinations were made without using a reference system, once the dry-weight equivalent had been established.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 65 (1978), S. 389-390 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 7
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The zinc content of the liver and the thigh muscle of the rat were measured by means of atomic absorption spectrophotometry under different conditions: standard diet, carbohydrate diet, an experimental dystrophy model and its recovery period. The influence of a parental mineral substitution on the whole body and the organ weight was studied. Carbohydrate diet caused a lower rise of the whole body weight, a decrease of the zinc content of the liver and an increase of the zinc content of the thigh muscle. In dystrophy model, the liver weight decreased to one fifth of the controls. The zinc concentration of the liver increased markedly, the zinc content of the whole liver is equal to that of control animals. The thigh muscle showed an increase of the zinc content, too. The parenteral mineral application had no effect upon the whole body weight and the organ weights. Little influences on the zinc content of the skeletal muscle were seen. The zinc content of parenchymatous organs varies markedly, and it is influenced by diets and disease. In the dystrophy model, zinc is concentrated in atrophic organs in order to protect the organism against zinc deficiency.
    Notes: Zusammenfassung Der Zinkgehalt der Leber und der Oberschenkelmuskulatur der Ratte wurde nach einseitiger Kohlenhydratdiät, einem experimentellen Dystrophiemodell sowie nach dessen Erholungsphase untersucht. Es wurde der Einfluß einer parenteralen Substitution organischer bzw. anorganischer Mineralverbindungen auf das Gesamtkörpergewicht, das Organgewicht und die Organ-Zink-Konzentration verfolgt. Die einseitige Diät führt zu einer retardierten Entwicklung der Versuchstiere und zu einer Umverteilung von Zink aus der Leber in die Skeletmuskulatur. Das Dystrophiemodell reduziert das Lebergewicht durch Atrophie der Hepatozyten auf ein Fünftel des Normalgewichts. Die relative Zinkkonzentration steigt dabei so an, daß der Gesamtzinkgehalt in der Leber unverändert bleibt. In geringerem Ausmaß konzentriert die Skeletmuskulatur Zink in den atrophischen Muskelfasern. In der Erholungsphase hat die parenterale Gabe organischer oder anorganischer Metallverbindungen keinen Einfluß auf das Körpergewicht, das Organgewicht und m. E. den Zinkgehalt der Organe. Die Zinkkonzentrationen der parenchymatösen Organe sind somit Variable, die durch Stoffwechseleinflüsse und Krankheit beeinflußt werden.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 343-344 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 2–4 h nach Hypophysektomie erhöht Noradrenalin den Sauerstoffverbrauch wie bei Kontrollratten, 7 Tage nach der Entfernung der Hypophyse ist jedoch diese Wirkung des Noradrenalin aufgehoben. Die CO2-Abgabe verhält sich qualitativ wie der Sauerstoffverbrauch.
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  • 9
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Mit einer vereinfachten Methodik der röntgenhistoradiographischen Trockengewichtsbestimmung ohne Referenzsystem wurden vergleichende Untersuchungen mit dem Bakerschen Interferenzmikroskop an Zellausstrichen von Bullenspermien und -thymuslymphocyten, Froscherythrocyten und Plattenepithelien der menschlichen Mundschleimhaut durchgeführt. Die gewonnenen Ergebnisse stimmen gut überein. Die Abweichungen betragen etwa 10%. Sie geben einen Einblick in die Fehlerbreite beider Methoden und bestätigen insbesondere die Genauigkeit der von uns angewandten quantitativen röntgenhistoradiographi schen Methodik.
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  • 10
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Meiotic chromosomes of spermatocytes from INH-treated male mice and Chinese hamsters were analysed for chromosome aberrations in diakinesis-metaphase I and metaphase II. The experiments were performed in two laboratories while a third laboratory participated in the chromosome evaluation. No enhancement of chromosome aberrations could be observed after acute treatment of early primary spermatocytes or chronic treatment of spermatogonia with INH.
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