Öz The comments is respect of my text (1), in the letter written by Külköylüo¤lu et al. (2) mislead the reader and are unreal. My replies regarding such issues are as following: 1. Özulu¤ (3) defended her thesis on 23.02.2000. The thesis defended in Scientific Institute of ‹stanbul University is only kept in the Institute except the committee of examiners and the candidate. It is not possible to know that on which time the thesis will be submitted and the content of the thesis since the date on which time the thesis will be defended only known by thesis jury members and the candidate. The only place where Özulu¤’s thesis (3) can be rewieved is ‹stanbul University Central Library and Biology Library of Faculty of Science.