Demonstration of cobalt in histological sections using ion microanalysis by high mass resolution : application to the study of experimental chronic epilepsy in the rat]

Cobalt is specifically detected in ion microanalysis by high mass resolution. This method allows detection of the remaining cobalt in histological sections of Rat's cortex, after treatment by topic application of cobalt powder and demonstrates a diffusion of the metal into the epileptic area.     

An analysis of distal dominance in the regenerating limb of the axolotl

Résumé La régenération d'une patte (Ambystoma mexicanum) n'est pas empêchée par la présence d'une greffe d'une patte sur la surface d'amputation d'un membre hôte. La greffe d'une patte cependant articule avec le régénérat hôte à un niveau homologue le long de l'axe du membre.

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This work was supported by a grant (No. GB-2618) from the National Science Foundation.     

Sur la caractérisation de dérivés guanidiques d'origine biologique par électrophorèse et chromatographie sur papier (chromatoélectrophorèse)

Summary Paper chromatography has been used in conjonction with electrophoresis in a perpendicular direction (chromatoelectrophoresis), in order to characterize various guanidoderivatives of biological interest and also citrulline. The isolation of definite spots can be obtained with a satisfactory selectivity by this procedure, at a higher speed than by bidimensional chromatography; and the use of a few coloured reactions (ninhydrine,Sakaguchi, diacetyle--naphtol andp-dimethylaminobenzaldehyde) on the same electrochromatogram has been successfully practised in this field.     

Absence of effects of dibutyryl cyclic guanosine 3',5'-monophosphate on release of alpha-amylase, 45Ca efflux, and protein synthesis in rat pancreas in vitro.

Dibutyryl cyclic GMP did not affect basal, or carbachol stimulated secretion of alpha-amylase from rat pancreas. The nucleotide did not have a significant effect on 45Ca release from the pancreas nor did it alter the response to carbachol. The dibutyryl analogue of cyclic GMP did not duplicate or alter the inhibitory effect of carbachol on 3H-leucine incorporation into pancreatic trichloroacetic acid-precipitable protein.     

Microheterogeneity of staphylococcal enterotoxin C2

Résumé L'hétérogénéité de l'entérotoxine C₂ d'un staphylocoque par électrophorèse en gel polyacrylamide est reliée à la présence d'isomers de charge différente.

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Acknowledgments. We thankDebbie Jeffrey, Yukio Yano andRobert Gagné for excellent technical assistance.