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  • 1
    Electronic Resource
    Electronic Resource
    Capacitation of Frog Sperm (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 183-184 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fertilization in the frog is external; but, because the frog's egg is surrounded by six concentric coats of jelly during passage down the oviduct6, the sperm encounters materials derived from the female reproductive tract. Amphibian eggs without jelly, either as they normally occur in the coelom or ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/227183a0
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  • 2
    Electronic Resource
    Electronic Resource
    Hormonally regulated expression of arginine kinase in Drosophila melanogaster (1990)
    Springer
    Development genes and evolution 198 (1990), S. 474-478 
    Details
    ISSN: 1432-041X
    Keywords: Arginine kinase ; Imaginal discs ; 20-hydroxyecdysone ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Arginine kinase (AK) is present throughout the life cycle of Drosophila melanogaster, but there is a sharp, transient peak of AK activity during the prepupal period and a second period of elevated activity at the time of eclosion of the adult. Imaginal discs show the greatest increase in AK activity at the prepupal stage of those tissues assayed. The prepupal peak is not seen when the temperature-sensitive ecdysoneless mutant ecd-1 is shifted to 29° C at mid-third instar larval stage. The peak in activity reappears when ecd-1 is either shifted back to 20° C after 60 h at 29° C or is fed 20-hydroxyecdysone. At the restrictive temperature, imaginal discs from ecd-1 larvae progressively lose AK activity, whereas discs from 20-hydroxyecdysone-fed larvae have a marked increase in AK activity at stage P3 of the prepupal period. These data suggest that the prepupal peak is regulated by the hormone 20-hydroxyecdysone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399058
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology and histochemistry of the oviduct and egg-jelly layers in the frog, Rana pipiens (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 166 (1970), S. 541-555 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Morphologically the oviduct of the frog, Rana pipiens, consists of a lining epithelium and tubular jelly-secreting glands. The oviduct can be divided into six regions (designated R1 anteriorly - R6 posteriorly) based on the differential staining of the jelly glands. The regions measured 1, 5, 6, 3, 20 and 3 cm, respectively. These regions correspond to 6 histochemically distinct layers of jelly (designated J1 nearest the egg through J6 farthest from the egg) which are deposited around the egg during the egg's sojourn in the oviduct. A correlation between lengths of each oviducal region and thickness of individual jelly layers was observed. That is, J5 is the thickest, followed by J3, 2, 6, 4 and J1 which is thinnest.Histochemical properties of jelly glands and corresponding jelly layers were essentially the same in the tests performed. All regions and layers except R5 and J5 contain a large amount of acid mucopolysaccharide and the mucopolysaccharide in R and J1, 3 and 4 is sulfated. Neutral mucopolysaccharide is present in R2, J2, R5 and J5. Although protein is present in all layers and oviducal regions it was found in higher concentration in R and J1, 3 and 6 and in lowest concentration in R and J2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091660311
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  • 4
    Electronic Resource
    Electronic Resource
    Early gene interaction during prepupal expression of Drosophila arginine kinase (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Developmental Genetics 13 (1992), S. 302-305 
    Details
    ISSN: 0192-253X
    Keywords: Arginine kinase ; developmental regulation ; Drosophila ; ecdysone ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Arginine kinase displays a distinctive rise and fall in specific activity and specific protein levels during the prepupal stage of Drosophila development with maximal activity occurring at morphological stage P3. This developmentally regulated peak is under the influence of ecdysone. Altered doses of the major ecdysone-inducible “early” genes at cytological regions 75B and 2B5 alter this pattern of expression while altered doses of another major “early” gene at 74EF have no effect. We hypothesize that a product of the 2B5 locus and a product of the 75B locus interact to effect this developmental pattern of expression of Drosophila arginine kinase. © 1992 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/dvg.1020130407
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