[Ovarian calcium and fertilization in female rats receiving a subchronic overdose of vitamin D3]. / Calcium ovarien et fécondation chez la ratte recevant une surcharge subchronique en vitamine D3.

Calcium is increasing in ovaries of adult female rats when D3 vitamin is given by stomach intubation for 7 and 15 days. Histochemical studies show the presence of spherular chalky deposits specially in granulosa of some follicles. In the same times atresia becomes evident and fecondation is reduced. Chemical determination of calcium content of ovary show calcium accumulation in this organ.

[Study of the element secretory glands of a tubicolous polychaete (Pectinaria (= Lagis) koreni) with the help of electron microprobe and ion microanalyzer (author's transl)]. / Etude de la glande cémentaire d'un polychète tubicole (Pectinaria (= Lagis) koreni) à l'aide de la microsonde électronique, du microanalyseur ionique et du microscope électronique à balayage.

Two histophysical methods (electron microprobe and ion microanalyzer) were used on sections of Annelids in order to study the inorganic composition of cement secretory glands. Mg, Ca and P were demonstrated in large amounts in the secretions, associated with organic matter. Traces, or no, Fe, Al and Si were found. Possibilities of artifacts are discussed, and these results are compared with biochemical methods. A hypothesis is proposed in order to explain the differences observed between biochemical and present results, which suggest, for the hardening of cements a different chemical mechanism to that suggested by Vovelle in annelid Sabellaria alveolata.