Demonstration of prolactin-releasing activity in the pigeon.

The capacity of the pigeon pituitary gland to release prolactin was investigated in vivo, to evaluate its hypothalamic regulation and to establish the dominant hypothalamic factor for prolactin secretion. After 3 days of systemic administration of some physiological and pharmacological agents, followed by 2 consecutive days of local intradermal injections of prolactin into their crop sacs, the crop mucosa was scraped, dried and weighed. The substances tested were: oestradiol and tamoxifen (antioestrogen), thyrotophin-releasing hormone (TRH) and anti-TRH serum, perphenazine (releases prolactin in mammals) and bromocriptine (suppresses prolactin in mammals).

Effect of the timing of perphenazine administration on pregnancy in the rat.

Perphenazine in doses of 10--50 mg kg-1 day-1 given at the early stages of pregnancy delayed nidation up to day 8 of pregnancy. Once nidation had occurred the length of the rest of the gestation period was normal. Doses of up to 20 mg perphenazine kg-1 day-1, injected on days 1--7, prolonged gestation but the mothers and young were apparently normal; lower doses were effective only when treatment commenced soon after copulation.

Quantitation of nitroglycerin in human blood after administration by sustained release.

Nitroglycerin was traced in the blood of 20 patients up to 4 h after oral administration of a sustained release preparation (Nitro-Mack Retard). The determination needs an extremely sensitive method using GLC-columns with 3% SE-30 (Packard) equipped with an electron capture detector.