Ph.D. THESIS SPERM SELECTION FOR HUMAN ASSISTED REPRODUCTION - EXAMINATION OF THE SAFETY OF DIFFERENT SPERM PREPARATION METHODS IN ELIMINATING SPERMATOZOA WITH NUMERICAL CHROMOSOME ABNORMALITIES AND CELLULAR IMMATURITY Spermium szelekci humÆn asszisztÆlt reprodukcihoz külnbzQ spermium elQkØsztØsi eljÆrÆsok hatÆsÆnak vizsgÆlata a szÆmbeli kromoszma rendellenessØggel Øs ØretlensØggel sœjtott ivarsejtek gyakorisÆgÆnak alakulÆsÆra ATTILA JAKAB, M.D. DEPARTMENT OF OBSTETRICS AND GYNECOLOGY MEDICAL AND HEALTH SCIENCE CENTER UNIVERSITY OF DEBRECEN DEBRECEN, HUNGARY Tutor: Antal Borsos, M.D., Ph.D., D.Sc. Debrecen, 2003