ovum (ova)
1.Raising eri silkworm( Philosamia Cynthia ricini B) and silkworm ( Bombyx mori L) (1 5 larval or ovum stages) in the raising room with rich negative ions of oxygen(510 Ncm)by using negative ions of oxygen generators of AS series. The influence and effect of negative ions of oxygen on silkworm was studied by the genital and developing order of pupaes,moths,ova,antsilkworms and silkworms.
