Abnormal sensitivity to erythropoietin in the erythroblast precursors in Vaquez disease]

Marrow specimens of patients with polycythemia vera rise to erythrocytic colonies in vitro without addition of erythropoietin to the culture. This behavior was never observed with marrow cells of normal subjects or secondary erythrocytosis. These results indicate that the sensitivity of some erythrocytic progenitor cells to erythropoietin is altered in polycythemia vera.     

Coexistence of neoteny and an internal cycle a polystomatid (Monogenea)]

Metapolystoma cachani a parasite of Ptychadena longirostris (Peters) has been discovered in the Ivory coast. Its life cycle is the first to involve both the possibility of an internal cycle in the bladder of the adult Amphibian and a neotenical reproduction on the gills of the Tadpole. This double process is the link between the Monogeneans which are only parasites of aquatic hosts and those which are adapted to terrestrial hosts. Its place is therefore essential in the phylogeny of Polystomatidae.     

Activité des N-acétyl-glucosaminyl-transférases microsomiques chez les souris BALB/c infectées par le virus de la tumeur mammaire murine (M-MTV)

Summary N-acetyl-glucosaminyl transferase in spleen cells of mice infected with M-MTV is enhanced. This increased synthesis of glycoprotein is not due to synthesis of new enzyme. Such a result suggest that the spleen is implicated in the infecting process.

---

---

Ce travail fait partie d'une thèse de Doctorat ès-sciences préparée sous la direction de Madame le Docteur Jacqueline Mouriquand. Nous remercions le Professeur Pierre Louisot pour ses conseils fructueux dans la conduite de ce travail.