[A solved problem:  absolute sterility].
D000985:Antisepsis; D001207:Asepsis; D006801:Humans; D007248:Infertility, Male; D008297:Male; D019999:Pharmaceutical Solutions; D014465:Ultrasonics
D019999:Pharmaceutical Solutions
ANTISEPSIS AND ASEPSIS; ULTRASONICS/effects
Ein gelöstes Problem:  Absolute Keimfreiheit.