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  • Chemistry  (22)
  • General Chemistry  (2)
  • Steroids  (2)
  • Gonadotropin
  • Gonadotrops
  • Liquid chromatography
  • Magnetism
  • Seismology
  • 2000-2004  (3)
  • 1980-1984  (16)
  • 1955-1959
  • 1940-1944  (6)
  • 1935-1939
  • 2002  (1)
  • 2000  (2)
  • 1983  (6)
  • 1980  (10)
  • 1943  (6)
Collection
Publisher
Years
  • 2000-2004  (3)
  • 1980-1984  (16)
  • 1955-1959
  • 1940-1944  (6)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 233 (1983), S. 377-388 
    ISSN: 1432-0878
    Keywords: Gonadotrops ; Gonadotropin secretion ; Steroids ; Brain-pituitary-gonadal axis ; Juvenile teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a cytophysiological study it was investigated whether in juvenile trout gonadal steroids stimulate the gonadotropic (GTH)-cells directly or indirectly via the brain. Pituitaries of donor animals were transplanted into the caudal musculature of testosterone-treated and non-testosterone-treated host fish. Testosterone treatment caused an increase in GTH-content in the in situ pituitaries and in the grafts. Accordingly, the gonadotrops displayed ultrastructural changes such as the appearance of well-developed Golgi systems and large globules. The stimulation of the morphological development of gonadotrops and of synthesis and storage of GTH in the allografted pituitaries indicates that testosterone affects the GTH-cells directly. In untreated juvenile trout the gonadotropin content of the pituitary and the gonadotropin concentration in the plasma vary with the time of year. This variation and the role of testosterone and gonadotropin-releasing hormone on the release of GTH are discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
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    In:  Eos, Trans., Am. Geophys. Un., Warszawa, Pergamon, vol. 83, no. 29, pp. 309, 314 & 315, pp. L19306, (ISBN: 0-12-018847-3)
    Publication Date: 2002
    Keywords: Seismology ; Instruments ; OBS ; Hamburg ; GeomagneticsR ; Italy ; Fluh ; Flüh
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 14 (1980), S. 103-103 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0878
    Keywords: Pituitary, juvenile trout ; Gonadotropin ; Steroids ; LHRH ; Organ culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pituitary glands from 6-month-old sexually immature female rainbow trout, Salmo gairdneri, were kept in organ culture for 48 or 72 h. Certain groups of pituitaries were cultivated for 48 h on either control medium or medium with 17α-methyltestosterone (MT), or with estradiol-17β (E2) in concentrations of 8.5 × 10-7 M. Other groups of pituitaries were cultivated for 72 h on control medium, or for 48 h on either control medium or MT-medium or E2-medium, and subsequently for 24 h on medium with synthetic LHRH in concentrations of 8.5 × 10-7 M and 8.5 × 10-10 M. Gonadotropic (GTH) cells are identified by Alcian Blue-Periodic Acid Schiff-Orange G staining and the double-antibody immunoenzyme-cytochemical technique using anti-carp βGTH as the first antibody. A quantitative histological procedure was used to study the nuclear size of the GTH cells in response to the different hormones. Secretory activity was estimated by measuring the gonadotropin (GTH) content in extracts of pituitaries, plasma, and the culture media every 24 h by radioimmunoassay. Cultivation on MT- or E2-enriched medium results in an increase of the total amount of GTH in the pituitary and medium, an accumulation of GTH in GTH-cells (approximately 20 percentage points) and an increase in their nuclear size, indicating a stimulation of GTH synthesis. However, autonomous GTH-release is not affected by these steroids. Subsequent cultivation of the pituitaries for 24 h with LHRH causes stimulation of GTH synthesis (approximately 20 percentage points). Preincubation with steroids increases the GTH synthesis capacity of LHRH only when used in a concentration of 8.5 × 10-10 M. Moreover, 8.5 × 10-7 M LHRH causes a stimulation of GTH-release. Preincubation of the pituitaries with steroids increases the responsiveness of GTHcells to LHRH. It is concluded that GTH-production in pituitaries of immature female rainbow trout can be directly influenced by gonadal steroids and by a hypophysiotropic substance.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 2031-2043 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Saccharomyces cerevisiae CBS 426 was grown aerobically in continuous culture with a mixture of glucose and ethanol as the carbon source. The flows of biomass, glucose, ethanol, oxygen, and carbon dioxide were measured. A model for growth with two substrates was derived. Application of this model to the above-mentioned system yielded values for YATP and P/O. The joint confidence regions for these parameters were calculated. The relevance to industrial production of bakers' yeast is discussed.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 92-100 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Relationship Between Composition, Elastic Modulus and Creep of Phenolic Plastics at Room TemperatureThe mechanical properties of thermosetting material can be modified by the type and quantity of filler or the combination of fillers. By this methode it is possible to produce a certain moulding powder for a certain application. The elastic modulus and the creep are significant values for short-time and long-time mechanical behaviour. The relationship between these both characteristic values and the compositions of moulded materials (multiphase phenolic resin systems) will be discussed.
    Notes: Die mechanischen Eigenschaften duroplastischer Teilchenverbundwerkstoffe können unter anderem durch die Wahl des Harzträgers beeinflußt und somit dem jeweiligen Anwendungsfall angepaßt werden. Für das mechanische Kurz- bzw. Langzeitverhalten sind der E-Modul und die Kriechdehnung als signifikant anzusehen, daher wird am Beispiel dieser beiden Werkstoffdaten der Zusammenhang von Formstoffzusammensetzung und mechanischen Eigenschaften aufgezeigt. Die untersuchten Phenoplast-Formstoffe bestehen aus den Hauptkomponenten Harz/Holzmehl/Gesteinsmehl.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 11 (1980), S. 209-212 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: X-Ray Stress Measurement on Austenitic Steels - A Possibility of Predicting Fatigue DamageBased on the results found for fatigue tests on a ferritic steel combined with x-ray stress analysis similar investigations were carried out for an austenitic stainless steel. For that reason the Wöhler tests were interrupted after defined load cycle numbers and the residual stress and the half value breadth of the x-ray peaks were determined in the groove of the samples. The investigation has shown correlations between residual stress, load amplitudes and load cycle numbers. These relations in connection with a dependence of the breadth of the x-ray peaks from the load cycle number have been used for a non-destructive testing model of predicting the life of samples under alternating load.
    Notes: Aufbauend auf Untersuchungen an einem ferritischen Stahl wurden an Proben aus einem austenitischen Stahl Ermüdungsversuche kombiniert mit Eigenspannungsmessungen durchgeführt. Dazu wurden die Wöhlerversuche definiert nach vorgegebenen Lastwechselzahlen unterbrochen und röntgenografisch die Eigenspannungen und Interferenzbreiten im Kerb der Proben bestimmt. Es zeigten sich Abhängigkeiten der Oberflächeneigenspannungen von Lastamplituden und Lastwechselzahlen, die unter Zuhilfenahme der ebenfalls gefundenen Zusammenhänge zwischen Halbwertbreiten und Lastwechselzahlen dazu herangezogen werden, um auf zerstörungsfreiem Wege auf die Lebensdauer wechselbeanspruchter Proben zu schließen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 3 (1980), S. 298-298 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Closing technique for static coating ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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