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  • 1
    Publication Date: 2002-03-01
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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  • 2
    Publication Date: 2015-02-28
    Print ISSN: 1557-1939
    Electronic ISSN: 1557-1947
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Springer
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 195 (1986), S. 1-9 
    ISSN: 1432-041X
    Keywords: Rana esculenta complex ; Protein synthesis ; Embryogenesis ; Heat shock ; Amphibian oocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have used isotopic labelling and both one-and two-dimensional electrophoretic procedures to analyse the protien synthesis patterns in oocytes and early embryos of three phenotypes of the European green frogs. The results demonstrated that protein patterns of Rana ridibunda and R. esculenta are identical, but that they differ from those of R. lessonae. Progeny of the lethal cross R. esculenta × R. esculenta showed a distinct delay in the appearance of stage-specific proteins during early embryogenesis. The heat-shock response of R. ridibunda and R. esculenta oocytes was found to be identical, but different from that of Xenopus laevis. The implications of these findings, with respect to hybridogenesis in R. esculenta complex and variations in the regulations of heat shock genes in different amphibian species, are discussed.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 147 (1954), S. 214-258 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 145 (1952), S. 462-496 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 146 (1953), S. 515-536 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung 1. Bei 2–3 Monate alten Larven vonTriton alpestris werden rechteckige Epidermisstücke aus der Flanke der einen Körperseite herausgeschnitten. 2. Die Wundfläche wird im Laufe von 24 Std durch allseitige Zuwanderung von Epidermiszellen bedeckt. 3. An der Wundheilung sind außer den Grundzellen der Epidermis auch die ausdifferenziertenLeydigschen Drüsenzellen in vollem Ausmaße beteiligt. 4. Über der Wundregion kommt es zu einer überschüssigen Akkumulation von Leydig-Zellen; ihr entspricht eine starke Verarmung in allen Epidermisarealen, welche die Wundränder umgeben. 5. Die durch Wanderung bedingte Veränderung in der Verteilungsdichte der Leydig-Zellen wurde quantitativ erfaßt, und der Einflußbereich der Wundregion bestimmt. 6. Zellvermehrung durch Mitose spielt bei den Regenerationsvorgängen bis zum 8. Tage nach der Operation keine nachweisbare Rolle. 7. Durch Colchicin und durch ein Aminoketon kann die reparative Zellbewegung gehemmt werden.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 7 (1951), S. 140-141 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Chimeric adhesive organs produced by xenoplastic ectodermal transplantations betweenBombinator andTriton germs are described. The adhesive organs are very different in the two amphibian groups. The projecting rodshaped balancer of theTriton larva is formed by two epidermal layers and an axial mesodermal core (mesectoderm), while the flat adhesive sucker of the youngBombinator tadpole consists mainly of one epidermal layer of secretion cells. Probably the two organs are either non-homologous, or the homology is partial only. Nevertheless, in the chimeras young balancers are formed, the epidermal layers and the mesectoderm of which are provided in part byTriton and in part byBombinator.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 165 (1970), S. 132-149 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Mittels Polyacrylamidgel-Elektrophorese wurden die Serumproteine der metamorphosierenden Larven und adulten Tiere vonRana temporaria, Bombina variegata, Bufo bufo undTriturus alpestris aufgetrennt. Auf Grund der Ergebnisse verschiedener spezifischer Färbemethoden konnte das Vorkommen von Albumin, Transferrin, Glycoprotein, Lipoprotein und möglicherweise Haptoglobin nachgewiesen werden. 2. Im allgemeinen werden die elektrophoretischen Muster mit fortschreitender Metamorphose komplizierter. Eingehende Analysen bewiesen, daß neue Serumproteine während der Metamorphose und der adulten Reifung auftreten. 3. Bei allen drei Anurenarten nimmt die Totalkonzentration der Serumproteine im Laufe der Metamorphose rasch zu. Die Albuminfraktion zeigt die höchste Syntheserate, so daß das Verhältnis Albumin zu Globulin gegen Abschluß der Metamorphose eine zwei- bis fünffache Erhöhung aufweist. Während des adulten Wachstums bleibt dieses Verhältnis konstant trotz einer weiteren Zunahme der Totalkonzentration. Ähnliche Veränderungen des Proteinmusters konnten bei jungen Larven vonR. temporaria undB. bufo, die mit Thyroxin behandelt worden waren, festgestellt werden. 4. Im Gegensatz zu den drei Anuren zeigtT. alpestris eine viel geringere Zunahme der Totalkonzentration der Serumproteine und keine Veränderung des Verhältnisses Albumin zu Globulin während der Metamorphose. Andererseits konnte eine maximale Zunahme des Proteins in der Gelregion einiger Globulinfraktionen, die eine relativ langsame Anodenbeweglichkeit besitzen, beobachtet werden. 5. Die stoffwechselphysiologischen und molekularen Aspekte der Veränderungen des Serumproteinmusters während der Metamorphose bei Amphibien werden diskutiert.
    Notes: Summary 1. Serum proteins in the metamorphosing larvae and adult animals ofRana temporaria, Bombina variegata, Bufo bufo andTriturus alpestris were separated by polyacrylamide gel electrophoresis. Based on various specific staining reactions the occurrence of albumin, transferrin, glycoprotein, lipoprotein and possibly haptoglobin was identified. 2. In general, the electrophoretic patterns become increasingly more complex with the progress of metamorphosis. Detailed analyses revealed the appearance of various new serum proteins both at the time of metamorphosis and during adult maturation. 3. In all three anuran species there is a rapid increase in the total serum protein concentration as metamorphosis proceeds. The albumin fraction shows the highest increasing rate, resulting in a two- to fivefold increase of the albumin/globulin ratio with the completion of metamorphosis. During postmetamorphic growth this ratio remains constant in spite of the continuous rise of the total concentration. Similar changes of the serum protein pattern have been observed in premetamorphic larvae ofR. temporaria andB. bufo treated with thyroxine. 4. T. alpestris differs from the three anurans in having a much smaller increase of the total serum protein concentration and showing no change of the albumin/globulin ratio at metamorphosis. Instead, a maximum increase of protein in the gel section of relatively slow anodal-moving globulins was observed. 5. The metabolic and molecular aspects of the changes of serum proteins during amphibian metamorphosis are discussed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 1283-1292 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Experiments designed to analyze the lethality and hybridogenesis in the European green frog complex have yielded the following results: 1. As a rule the inter-se cross ofRana esculenta is lethal, but several crosses have produced fully viable progeny. The frequency of such ‘break-through’ crosses appears to be related to parental population structure. 2. Parabiotic joining of lethal to viable embryos indicates that manifestation of the lethal effect is autonomous. There is, however, a 16–18% increase in the life span of the lethal partner. 3. Studies of LDH isozyme patterns revealed that thelessonae-specific alleles coding for the Ba and Bc subunits can be passed to the F1 progeny from a parental female or male of theesculenta phenotype. This demonstrates that there is no total elimination of thelessonae genome in theesculenta germ cells. 4. Immunologically, offspring from the inter-se cross ofR. esculenta show a closer relationship to theridibunda than to theesculenta phenotype. Variations of antigenic protein patterns suggest the possibility of chromosomal recombination betweenlessonae andridibunda in theesculenta hybrid. These results are confirmed by two-dimensional electrophoretic analysis of proteins in the oocytes of the three frog phenotypes.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 276 (1986), S. 43-51 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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