On the question of American eels,Anguilla rostrata versus European eels,Anguilla anguilla

Zusammenfassung Der amerikanische AalAnguilla rostrata (2n=38; 20M+18A) gehört einer anderen Spezies an als der europäischeAnguilla anguilla (2n=38; 32M+6A).

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This work was supported in part by a grant No. CA 05138 from the National Cancer Institute, U.S. Public Health Service.     

Lymphatic metastasis of tumour; persistent transport of cells

Summary A model of lymphatic metastasis established by injecting Walker rat carcinoma cells into the rat footpad was used to study the output of tumour cells from the footpad. The lymphatic efferent from the footpad was cannulated in a group of rats with advanced neoplasm; it was shown that the output of tumou cells was continuou over periods up to 90 min and ranged from 10²–10⁵ cells/min.Acknowledgment. This work was supported by a grant from the National Cancer Institute of Canada to C.R.F. and I.C. We are grateful to Mrs W. Kao and Mr I. Etches for meticulous technical help and to the Photographic Section, Department of Pathology for illustrations. Dr V.S. Gupta of Veterinary Physiology, University of Saskatchewan supplied the tumour for transplantation.     

Une note concernant la centrifugation fractionnée de foie de rat

Summary Significant differences were observed in enzymic composition of L and P fractions between fasting and fed animals. The L fraction contains a smaller percentage and the P fraction a higher percentage of the enzymic activity of the homogenate when the rat is fed, which can be explained by the sedimentation in the L fraction of a high proportion of the glycogen accumulated in the liver of fed animals. The presence of this component changes the organization of the centrifugation pellet so that, during the decantation of the L fraction, subcellular structures sedimenting in this fraction are sucked off and recuperated in the next centrifugation pellet, i.e. in the microsomal P fraction.