In the mid-1950s it was shown that ovulation can be inhibited by oral administration of
progesterone or of synthetic progestogens such as norethynodrel. The idea that …

Inconceptual terms the history of low level pregestogens as fertil ity regulating agents may
be traced to the end of the last century, when Beard and Preinant observed that no ovulation …

DLIRINCTHESECONDWORLDWAR, lwasworkingin the laboratory of Sir John Hammond
and Dr. Arthur Walton at Cambridge University on methods of preservation of mammalian …

MATERIALS AND METHODS Women whose pregnancy history proved them to be fertile
were selected for study. In certain instances confirmation of their ovulatory status was sought …

The chief endocrinological effect of oral contraceptives is exercised on the feedback
mechanism of the gonadal steroids to the hypothalamus. Apparently the receptor …

The role of progesterone (P) in the mechanism of ovulation is controversial at best. The
contraceptive application of P was established in rodents in 1936 and with orally absorbed …

PIP: The antifertility effect of long-acting injectable progestogens was evaluated in 2,000
young, fertile women observed during 34,800 woman-months. Depo-medroxyprogesterone …

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Abstract Norethisterone1), norgestrel, chlormadinone acetate or medroxyprogesterone
acetate was given orally from the third day after ovulation or later for various numbers of …

Model systems were evaluated, which can be used to determine biological activities of
progestogens at various cell levels of the anterior pituitary gland. in addition, various …