Fig. 4From: Tuning Surface Chemistry of Polyetheretherketone by Gold Coating and Plasma TreatmentSEM images of L929 cells cultivated for 72 h on pristine PEEK, PEEK treated by plasma (60 and 240 s), and their gold-coated parts sputtered for 30 and 300 s (microscopic glass coverslip served as a control). The scale bar corresponds to 10 μmBack to article page