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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cancer causes & control 2 (1991), S. 221-225 
    ISSN: 1573-7225
    Keywords: Age at menarche ; breast cancer ; estrogens ; Shanghai ; United States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: It has recently been reported that women with a recorded early menarche had approximately two-fold greater follicular phase serum E2 (estradiol) levels than women with menarche at age 13 or later. We have evaluated E1 (estrone) and E2 concentrations in the blood, and estrogen concentrations in the urine, in two groups of premenopausal women (mean ages 33 and 38 years) for categories of age at menarche. Study subjects were 106 Caucasian women in the United States (assessed for E1, E2, and urinary estrogens) and 39 women from Shanghai, China (assessed for E2). US subjects were classified according to whether their recalled menarche occurred before age 12, at age 12, or at age 13 or older. The mean age at recalled menarche of the Shanghai subjects was considerably older, and their ages at menarche were classified as less than age 15, age 15, and age 16 or older. We found little evidence in these premenopausal women in their thirties of an effect of age at menarche on estrogen levels. A large-scale study of women in the age range 20–40 years is necessary to investigate this important issue more thoroughly.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 21 (1987), S. 194-206 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Nobelpreis für Physik wurde 1986 je zur Hälfte dem Berliner Physiker Ernst Ruska für seinen bedeutenden Beitrag zur Entwicklung des Durchstrahlungs-Elektronenmikroskops und den Physikern Gerd Binnig und Heinrich Rohrer in Zürich für die Erfindung des Raster-Tunnelmikroskops zuerkannt. Die Auswahl der Preisträger verdeutlicht, welche Bedeutung Methoden der „Übermikroskopie“, mit denen eine weit höhere Auflösung [1] als mit der Licht-mikroskopie erreicht werden kann, inzwischen zukommt. Besonders mit Hilfe der Durchstrahlungs-Elektronenmikroskopie gelang es der Biologie und Medizin, den feineren Aufbau der Zelle kennenzulernen. Darüber hinaus stößt diese leistungsfähige Untersuchungsmethode bis in atomare Dimensionen vor und ist deshalb aus der Werkstoffkunde, der Mineralogie, der Physik und der Festkörperchemie nicht mehr wegzudenken.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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