the acute effect of instillation of the spermicide 2 % nonylphenoxypolyethoxyethanol ( nonoxynol-9 ) on the bioelectric activity of the vaginal epithelium was assessed using as an index the time taken in seconds to reduce the transvaginal potential difference ( p.d . ) , measured in anaesthetised rats , to half its initial value ( t1/2 ) .
C0068943
nonylphenoxypolyethoxyethanol
C0132776
nonoxynol-9