scholarly journals Does Atrazine Influence Larval Development and Sexual Differentiation in Xenopus laevis?

2008 ◽  
Vol 107 (2) ◽  
pp. 376-384 ◽  
Author(s):  
Werner Kloas ◽  
Ilka Lutz ◽  
Timothy Springer ◽  
Henry Krueger ◽  
Jeff Wolf ◽  
...  
Keyword(s):  
Xenopus Laevis ◽  
Larval Development ◽  
Sexual Differentiation

Androgen-induced plasticity at a “vocal” neuromuscular synapse

1994 ◽  
Vol 52 ◽  
pp. 32-33
Author(s):  
Darcy B. Kelley ◽  
Martha L. Tobias ◽  
Mark Ellisman
Keyword(s):  
Xenopus Laevis ◽  
Motor Neurons ◽  
Sexual Differentiation ◽  
Molecular Basis ◽  
Neuromuscular Synapse ◽  
Sexually Dimorphic ◽  
Intracellular Protein ◽  
Developmental Program ◽  
Androgen Action ◽  
Clawed Frog

Brain and muscle are sexually differentiated tissues in which masculinization is controlled by the secretion of androgens from the testes. Sensitivity to androgen is conferred by the expression of an intracellular protein, the androgen receptor. A central problem of sexual differentiation is thus to understand the cellular and molecular basis of androgen action. We do not understand how hormone occupancy of a receptor translates into an alteration in the developmental program of the target cell. Our studies on sexual differentiation of brain and muscle in Xenopus laevis are designed to explore the molecular basis of androgen induced sexual differentiation by examining how this hormone controls the masculinization of brain and muscle targets.Our approach to this problem has focused on a highly androgen sensitive, sexually dimorphic neuromuscular system: laryngeal muscles and motor neurons of the clawed frog, Xenopus laevis. We have been studying sex differences at a synapse, the laryngeal neuromuscular junction, which mediates sexually dimorphic vocal behavior in Xenopus laevis frogs.

Aqueous leaf extracts display endocrine activities in vitro and disrupt sexual differentiation of male Xenopus laevis tadpoles in vivo

2010 ◽  
Vol 168 (2) ◽  
pp. 245-255 ◽  
Author(s):  
Björn Hermelink ◽  
Ralph Urbatzka ◽  
Claudia Wiegand ◽  
Stephan Pflugmacher ◽  
Ilka Lutz ◽  
...  
Keyword(s):  
Xenopus Laevis ◽  
Sexual Differentiation ◽  
Leaf Extracts

Response of the amphibian tadpole (Xenopus laevis) to atrazine during sexual differentiation of the testis

2002 ◽  
Vol 21 (3) ◽  
pp. 527-531 ◽  
Author(s):  
Luz Tavera-Mendoza ◽  
Sylvia Ruby ◽  
Pauline Brousseau ◽  
Michel Fournier ◽  
Daniel Cyr ◽  
...  
Keyword(s):  
Xenopus Laevis ◽  
Sexual Differentiation ◽  
Amphibian Tadpole

Observations on the tissue and post-tissue larval development of Ascaridia dissimilis Vigeuras 1931, and a comparison with that of Ascaridia galli, in turkeys

Parasitology ◽  
1968 ◽  
Vol 58 (3) ◽  
pp. 709-714
Author(s):  
C. Horton-Smith ◽  
P. L. Long ◽  
D. L. Lee
Keyword(s):  
Growth Rate ◽  
Larval Development ◽  
Sexual Differentiation ◽  
Sexual Maturity ◽  
Room Temperature ◽  
Technical Assistance ◽  
Ascaridia Galli ◽  
Tissue Phase

A tissue phase of the nematode A. dissimilis has been demonstrated. The larvae enter the tissue soon after hatching and not, as previously thought, after 7 days.The growth rate of A. dissimilis in young poults has been studied. Sexual differentiation can be observed from the 14th day and sexual maturity occurs as early as 28 days after infection.From the recorded figures it is evident that A. dissimilis is not necessarily a smaller species than A. galli. The age of the host influences the development of maturity of the worms and probably the size of the nematodes as well. The largest female recorded here was 128 mm and the largest male was 77 mm when removed from a turkey 76 days after infection.The infectivity of A. dissimilis ova is not impaired after storage at room temperature in 1 % formalin for up to 237 days. Embryonation is complete in 9–10 days at 30 °C.It has been shown that chickens are probably refractory to A. dissimilis.We wish to acknowledge the technical assistance of Mr J. Brownbill, Mrs B. Fisher and Mr P. R. Mills.

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