The transmission of lymphosarcoma in Xenopus laevis, the South African clawed toad.

The Transmission of Lymphosarcoma in Xenopus laevis, the South African Clawed Toad1

The Xenopus lymphosarcoma agent is resistant to freezingthawing, freeze-drying, and antibiotics, but sensitive to heat, ether, and chloroform. It passes a 100-nui filter, and remains in the supernatant fluid following centrifugaron at 30,000 X g for 1 hr. The agent is passed from toad to toad through the water in which the Xenopus live. Phytohemagglutinin injection did not alter the latent peri...

Further Aspects of Lymphosarcoma in Xenopus (the South African Clawed Toad).

sarcoma.s in Triturus cristatus, and the experiments result ing in the induction of lymphosarcoma in Xenopus laevi@ laevis (2) have a number of similarities. Methylchol anth.rene as carcinogen and urethan as anesthetic are common features of these experiments, but whereas spontaneous lymphoid tumors are known in Xenopus, none have yet been reported in Triturus (1). Thus, the role of urethan in ...

Unequal contribution of native South African phylogeographic lineages to the invasion of the African clawed frog, Xenopus laevis, in Europe.

Due to both deliberate and accidental introductions, invasive African Clawed Frog (Xenopus laevis) populations have become established worldwide. In this study, we investigate the geographic origins of invasive X. laevis populations in France and Portugal using the phylogeographic structure of X. laevis in its native South African range. In total, 80 individuals from the whole area known to be ...

Experimental Studies on the Sexual Cycle of the South African Clawed Toad (xenopus

The mitochondrial ribosome of Xenopus laevis.

A mitochondrial ribosome with an approximate sedimentation coefficient of 60 S has been isolated from the ovary of the South African clawed toad, Xenopus laevis. This ribosome is active in a submitochondrial protein-synthesizing system. It contains two species of RNA, designated as "21S" and 13S RNA, which have sequences complementary to mitochondrial DNA and share no detectable sequence homolo...