Development of measurement apparatus for expansion and shrinkage during setting, using a non-contact micro displacement meter.
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Calcium Sulfate↗
Biomedical subjects
S Nishihara
Publications and source records attributed to S Nishihara.
Constriction of the fetal ductus arteriosus by glucocorticoid hormones.
Hydrocortisone, prednisolone, and betamethasone were injected into a rat that was 21 days pregnant, and the fetal ductus arteriosus was studied using the rapid whole-body freezing technique. All these glucocorticoids constricted the fetal ductus arteriosus in a dose-dependent relationship. Fetal ductal constriction was maximum 1 to 4 hr after injection and was significantly more prominent in premature fetuses than in mature ones.
Animals↗
Dilatation of the ductus arteriosus by prostaglandins and prostaglandin's precursors.
We studied the effects of prostaglandins and their precursors in animal models. Rabbit ductus arteriosus constricted rapidly after delivery. PGE1, and PGE2, and arachidonic acid injected SC dilated the ductus over 60 min. Orogastrically administered PGE2 dilated the ductus for 3 hr. PGF2a and arachidonic acid showed weak ductus-dilating effects. Response of the ductus to PGE1 was most prominent in the first hr after birth. Pretreatment with indomethacin blocked the ductus-dilating effect of arachidonic acid.
Age Factors↗