Ver�nderungen der Aktivit�t und des Isoenzymmusters der LDH (Laktatdehydrogenase) w�hrend der Entwicklung bei Urodelen und Anuren (Triturus alpestris undvulgaris, Ambystoma mexicanum, Xenopus laevis)

1975 ◽  
Vol 176 (3) ◽  
pp. 191-205 ◽  
Author(s):  
I. Faulhaber ◽  
L. Lyra
Keyword(s):  
Xenopus Laevis ◽  
Ambystoma Mexicanum ◽  
Triturus Alpestris

Electron Microscopy of the Amphibian Model Systems Xenopus laevis and Ambystoma mexicanum

2010 ◽  
pp. 395-423 ◽  
Author(s):  
Thomas Kurth ◽  
Jürgen Berger ◽  
Michaela Wilsch-Bräuninger ◽  
Susanne Kretschmar ◽  
Robert Cerny ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Xenopus Laevis ◽  
Ambystoma Mexicanum ◽  
Model Systems

A reinvestigation of some of the tissue movements involved in the formation of the neural tube and the eye/lens system of Triturus alpestris and Xenopus laevis

Development ◽  
1966 ◽  
Vol 16 (3) ◽  
pp. 431-438
Author(s):  
R. S. Lowery
Keyword(s):  
Xenopus Laevis ◽  
Neural Tube ◽  
Subsequent Development ◽  
Neural Plate ◽  
Eye Lens ◽  
Optic Vesicle ◽  
Lens System ◽  
Lens Development ◽  
Triturus Alpestris ◽  
Optic Cup

Since the beginning of the century the generally accepted scheme of eye/lens development has been that proposed by Spemann (1901) and later confirmed by numerous workers. According to this scheme the two presumptive components of the definitive eye, the optic cup and the lens, are spatially separated at the flat neural plate stage. They later come into apposition as a result of tissue movements which occur during the formation of the neural tube; the optic vesicle then provides an inductive stimulus for the subsequent development of the presumptive lens tissue. Spemann's suggestions concerning the tissue movements involved in the early formation of the eye/lens system do not appear to have been fundamentally questioned until the publication of a number of papers by Chanturishvili (1943, 1949,1958,1959,1962), although the theory of lens induction has been modified by workers such as Liedke (1955), Jacobson (1963) and von Woellwarth (1962).

Vitamin A inhibits amphibian tail regeneration

1987 ◽  
Vol 65 (2) ◽  
pp. 457-459 ◽  
Author(s):  
Steven R. Scadding
Keyword(s):  
Retinoic Acid ◽  
Vitamin A ◽  
Xenopus Laevis ◽  
Ambystoma Mexicanum ◽  
Complete Inhibition ◽  
Notophthalmus Viridescens ◽  
Tail Regeneration ◽  
Dose Levels ◽  
Dose Dependent

The objective of this investigation was to determine what effect vitamin A had on tail regeneration in Notophthalmus viridescens adults, in Ambystoma mexicanum larvae, and in Xenopus laevis tadpoles. Notophthalmus viridescens and Ambystoma mexicanum had their tails amputated and then were treated with retinol palmitate by immersion in concentrations known to cause proximodistal duplications in regenerating limbs. Xenopus laevis tadpoles had their tails amputated and then were treated with either retinol palmitate by immersion, or with retinoic acid administered by implantation of silastin blocks containing retinoic acid. The results ranged from no effect at all at the lower dose levels used, to complete inhibition of tail regeneration at higher dose levels. The degree of inhibition of tail regeneration appeared to be dose dependent. In no case were any duplicated or accessory structures formed analogous to those observed in regenerating limbs. This result suggests that the morphogenetic processes involved in tail regeneration are at least in some ways different from those occurring in limbs, where a similar vitamin A treatment would cause proximodistal duplication or production of accessory limb structures.

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