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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Biochemical and Biophysical Methods 18 (1989), S. 195-208 
    ISSN: 0165-022X
    Keywords: Disaccharidase ; Glycosidase, α-D- ; Immunobilized pH gradient ; Isoelectric focusing ; Maltase-glucoamylase ; Sucrase-isomaltase ; Trehalase ; Zymogram
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 162 (1992), S. 731-739 
    ISSN: 1432-136X
    Keywords: Ovary ; Abdominal integument ; Ecdysteroid biosynthesis ; Radioimmunoassay ; Cricket, Gryllus bimaculatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ovaries from 4-day-old female adults of Gryllus bimaculatus produce about 5 ng of free and conjugated ecdysteroids per hour during a 16-h incubation in Grace's medium. During incubation of pieces of the abdominal integument together with the adjacent segmental fat body, a net synthesis of moulting hormones is observed (2.3 ng per hour per animal), similar to that in the ovary. Separate incubations of disunited abdominal epidermis and segmental fat body tissue result in much lower rates of ecdysteroid synthesis. Ecdysteroid synthesis in ovarian homogenates is about one-third of that in intact organs. This reduction is due to a lack of conjugate formation in homogenates. Homogenates of the abdominal integument complex are no longer capable of synthesizing ecdysteroids. For both tissues, a de novo synthesis of ecdysteroids is corroborated by following the in vitro incorporation of [14C]-label from cholesterol and [3H]-label from 2,22,25-trideoxyecdysone (5β-ketodiol), respectively, into free ecdysone. The rate of incorporation into ecdysone is only 0.0014% for cholesterol but 0.48% for 5β-ketodiol. Both tissues represent primary sources of ecdysteroids in female adult crickets.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 46 (1995), S. 376-380 
    ISSN: 0947-5117
    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: Changes of the corrosivity of the atmosphere against metallic materials on the territory of the new federal countries of FRG since 1989The results of long-time examinations of the corrosivity of the atmosphere demonstrated that in the period from 1979 to 1989 on the territory of the formerly GDR no changes could be established.The comparison of these results with those obtained at the same territory in the period from 1989 to 1994 shows a significant decrease of corrosivity against metallic materials which is caused by a lower deposition rate of the corrosion pollutant SO2. This positive development can be explained by an improvement of the situation of immission which occurs in sequence of changes of the industrial structure as well as by active measures of environmental protection in the new countries of FRG after the political changes in the year 1989.
    Notes: Die Ergebnisse der Langzeituntersuchungen zur Korrosivität der Atmosphäre haben gezeigt, daß im Zeitraum von 1979 bis 1989 auf dem Gebiet der ehemaligen DDR keine signifikanten Veränderungen erfolgten.Der Vergleich dieser Ergebnisse mit denen aus den Jahren 1989 bis 1994 zeigt eine deutliche Abnahme der Korrosivität gegenüber metallischen Werkstoffen, die auf eine geringere Belastung durch den Schadstoff SO2 zurückzuführen ist. Diese positive Entwicklung kann sowohl durch die Verbesserung der Immissionssituation als Folge wirtschaftlicher Strukturveränderungen als auch durch aktive Umweltschutzmaßnahmen in den neuen Bundesländern in den Jahren nach 1989 erklärt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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