De la réaction mitotique de l'épiderme de la tétine de cobaye à la suite d'applications répétées de diverses substances

Summary (1) The majority of substances tested produced a weaker mitotic reaction of the epidermis of the guinea pig nipple after 3 applications (24 h intervals) of the same substance than after a single application.(2) This decrease in the ability of the epidermic cells to be divided has to be attributed, it seems, to a habit-forming processus and not to an exhaustion of the cells; indeed after two applications of geraniol, the application of a substance of different nature, Hormoestrol, produced in the nipple epidermis a mitotic flare up as intense as that obtained in the epidermis of a nipple not previously treated.(3) Aldehyde C₉ alone, among the substances tested, does not produce a decrease of epidermic mitoses after three applications but induces cellular alterations.     

The homo-isoflavones III. isolation and structure of punctatin, 3,9-dihydro-punctatin, 4′-O-methyl-3,9-dihydro-punctatin, 4′-demethyl-eucomin and 4′-demethyl-5-O-methyl-3,9-dihydro-eucomin

Zusammenfassung Aus den Zwiebeln vonEucomis punctata L'Hérit. (Liliaceae) wurden 5 neue Homoisoflavone isoliert und ihre Struktur aufgeklärt.