Change of electrokinetic properties of cell nuclei of Shinese, Bombyxmori L. (Lepidoptera: Lymantriidae) and oak, Antheraea pernyi Guйrin (Lepidoptera: Saturniidae) silkwormsduring spermatogenesis - Ja. R. Badradinov; V. G. Shakhbazov (The Kharkov Entomological Society gazette)