Larval Thymectomy of Xenopus laevis

Vascular control in larval Xenopus laevis

development, and the heart needs to function before it is completely differentiated and matured. Despite the early onset of the heart beat and blood circulation, their physiological role in oxygen transport has been questioned (Pelster, 1999; Pelster and Burggren, 1996). In small larvae such as those of Xenopus laevis and zebrafish, diffusion of oxygen through the body surface alone is consider...

Blood pressure control in a larval amphibian, Xenopus laevis.

The regulation of arterial pressure in early vertebrate embryos and larvae with non-innervated hearts is poorly understood. We used nanoliter intravascular injections in anaesthetized Xenopus laevis larvae (stage 49-51) to assess their ability to maintain arterial pressure in the face of a volume load. Injections of saline and hetastarch (a volume expander) were made into the ventricle. Arteria...

ترتیب اعصای جانبی در دم لارو of Xenopus laevis

The effect of early thymectomy on histogenesis of the lymphoid organs in Xenopus laevis.

The role of the thymus in the ontogenetic development of the lymphoid system of the clawed toad, Xenopus laevis, was investigated by removing the organ at stage 49 of Nieuwkoop & Faber (1967), a stage when small lymphocytes are present in the thymus but have not yet appeared in the peripheral lymphoid organs. Complete thymectomy, confirmed histologically, was achieved in nine larvae killed at s...

Response of larval Xenopus laevis to atrazine: assessment of growth, metamorphosis, and gonadal and laryngeal morphology.

Larval Xenopus laevis were exposed to one of four concentrations of atrazine (0, 1, 10, or 25 microg/L, 11 replicate tanks per treatment, 60-65 larvae per replicate) dissolved in an artificial pond water (frog embryo teratogenesis assay- Xenopus [FETAX]) medium beginning 48 h after hatching until the completion of metamorphosis. Separate groups of larvae (six replicate tanks per treatment, 60-6...