EVALUATION OF THE ANTIBACTERIAL ACTIVITY AND TOXICITY OF ISOLATED ARCTIIN FROM THE SEEDS OF CENTAUREA SCLEROLEPIS CENTAUREA SCLEROLEPIS TOHUMLARINDAN İZOLE EDİLEN ARCTİİN’İN ANTİBAKTERİYEL AKTİVİTESİ İLE TOKSİSİTESİNİN ARAŞTIRILMASI