Smooth muscle cells in ‘venous patches’ grafted into the rat common carotid artery. A structural study

Summary In the 2nd week after surgery, well differentiated smooth muscle cells (SMC) were evident in the walls of venous patches in rat common carotid artery. Gap junctions were the only type of intercellular junction observed between SMC in the present study.In memoriam to Prof. J. Cabré Piera.Acknowledgment. The LKB IV ultramicrotome was purchased with a grant from the Banco Urquijo, Madrid (Spain). Authors are also grate to M. Guerricabeitia for technical assistance.     

X-ray diffraction of the collagen contained in blood vessels]

An X-ray diffraction study has been undertaken on Human and Rabbit blood-vessels. Vessels are stretched 500% and the diagrams present a great analogy with those obtained from collagen. Thus, it appears, that it is possible to determine by X-Rays some pathological anomalies of the collagen in vessels.     

Sur l'origine de l'hypoblaste chez les oiseaux

Summary In the hypoblast-deprived chick embryos, with the help of carbon particle marking and tritiated thymidine labelling, it was found that the regenerated hypoblast consists of the cells invaginated through the primitive streak and those derived from the germ wall.

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Travail subventionné par le Fonds national suisse de la Recherche scientifique.

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L'auteur a bénéficié d'une bourse fédérale suisse pour les étudiants étrangers.