Thesis Discussion
College of science for women/University of Baghdad examined the thesis entitled (Investigating the effect of ZnO /SnO2 nanocomposite concentrations on its physical properties as a gas sensor)
of the student: Amna Ahmed Rashid Hassan
The thesis investigated the antibacterial and antibiofilm effects of Lactobacillus plantarum crude extract (L.pEx) and its chitosan nanoparticle formulation (L.pExCsNPs) against clinical isolates of P. aeruginosa and S. aureus. A total of 122 clinical specimens were collected from patients in Baghdad hospitals, resulting in 36 isolates of P. aeruginosa (29.5%) and 25 isolates of S. aureus (20.4%). PCR confirmed the identity of isolates using housekeeping genes (rpsL and 16S rRNA). Biofilm production was observed in all isolates with varying degrees of strength. Antibiotic susceptibility tests revealed high resistance in both bacterial species, most notably to Penicillin (100%) in S. aureus and Meropenem (63.8%) in P. aeruginosa.
The thesis also includes using ZnO/SnO2 nanocomposite as a gas sensor application for two types of gases (H2S and NO2). The sensitivity, response time and recovery time were studied
The final preparation showed that the ZnO/SnO2 nanocomposite with different concentrations including (50ZnO/50SnO2, 70ZnO/30SnO2 and 90ZnO/10SnO2) is sensitive to two types of gases (H2S and NO2) with different operating temperature (150, 200 and 250).
Final Grade: Excellent.
