en تخصصي Special پژوهشي Research <strong>Background:</strong> In this study, we evaluated antibacterial and antifungle activity of these derivatives against gram positive (<em>Staphylococcus</em> aureus, <em>Bacillus subtilis</em>, <em>B. cereus</em>), gram negative (<em>Proteus vulgaris</em>) bacteria and fungale (<em>Candida albicans, C. tropicalis and C. glabrata</em>).<br> <strong>Methods:</strong> The broth macro dilution and well agar diffusion methods were used for determination of inhibition zoom (IZ) and minimum inhibitory concentration (MIC) during preliminary evaluation of antimicrobial activity.<br> <strong>Results:</strong> The (MIC) values of tested compounds revealed that all compounds were active against <em>Staphylococcus oureus</em> and exhibited the same antibacterial activity in comparison to ceftizoxim (MIC=125&micro;g/mL). The results of antifungal screening showed that all the compounds were potent antimicrobial activity against tested pathogenic fungi (MIC=250 to1000 &micro;g/ml). Compounds (6a) and (6b) showed the maximum activity with MIC value of 250 &micro;g/ml against all tested fungi, but compound (6h) showed poor antifungal activity against all fungi. MIC values for title compounds were similar to MIC results for fluconazol.&nbsp;<br> <strong>Conclusions:</strong> All the compounds are potent antifungal and antibacterial activity against tested microorganism. Amino thiazol, Antimicrobial Activity, Antibacterial Activity, Antifungl Activity, Minimum Inhibitory Concentration Amino Thiazol, Antimicrobial Activity, Antifungl Activity, Minimum Inhibitory Concentration 33 37 http://ijt.arakmu.ac.ir/browse.php?a_code=A-10-478-1&slc_lang=en&sid=1 Maryam Kouhkan kouhkanmaryam@gmail.com 10031947532846006756 10031947532846006756 Yes MSc of Applied Chemistry, Member of Young Researchers and Elite Club, Urmia Branch, Islamic Azad university, urmia, Iran. Ali Souldozi 10031947532846006757 10031947532846006757 No Department of Biology, Urmia Branch, Islamic Azad University, Urmia, Iran. Reza Talebi 10031947532846006758 10031947532846006758 No Department of Microbiology, Urmia Branch, Islamic Azad University, Urmia, Iran.