Browsing by Author "Şener I."

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Antimicrobial activities and some flavonoids in extracts of some medicinal plants
(2017-07-01) Şener I.; Gür M.; Verep D.; Güney K.; Altuner E.
Origanum majorana, Melissa officinalis, Anthemis cotula and Avena sativa were extracted by using 65% ethanol to isolate their active constituents. The antimicrobial activities of extracts were investigated against 15 microorganisms by using the disk diffusion method, MIC (Minimum Inhibitory Concentration), MBC (Minimum Bactericidal Concentration) and MFC (Minimal Fungicidal Concentration) tests. Furthermore, the presence of some flavonoids were analyzed by using HPLC. It was determined flavonoids in the extracts of O. majorana, M. officinalis, A. cotula and A. sativa. As a results it was observed that O. majorana was active against Staphylococcus aureus, Enterococcus faecium, Enterococcus faecalis, Salmonella typhimurium and Pseudomonas aeruginosa, where M. officinalis was active against Enterococcus faecium and Enterococcus faecalis. On the other hand, both A. cotula and A. sativa were observed to be active against Enterococcus faecium. The extracts of plant samples showed antibacterial activity against tested microorganisms at different levels.
Erratum to: Recovery of Cr(VI) by using a novel calix[4]arene polymeric membrane with modified graphene quantum dots (International Journal of Environmental Science and Technology, (2017), 10.1007/s13762-017-1328-9)
(2017-10-01) Onac C.; Kaya A.; Alpoguz H.K.; Yola M.L.; Eriskin S.; Atar N.; Şener I.
The correspondence author in the original article was wrong. The correct correspondence author is Professor Dr. H. Korkmaz Alpoguz.
Recovery of Cr(VI) by using a novel calix[4]arene polymeric membrane with modified graphene quantum dots
(2017-11-01) Onaç C.; Kaya A.; Alpoğuz H.K.; Yola M.L.; Eriskin S.; Atar N.; Şener I.
Abstract: In this report, the recovery of Cr(VI) from chrome plating water by using a novel calix[4]arene-functionalized graphene quantum dots (GQDs) involved polymer inclusion membrane was investigated. The polymeric membrane supported by GQDs was characterized by using Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The SEM and AFM results clearly show that there are much larger visible pores on the membrane surface after modification of polymer inclusion membrane with GQDs and the micropores in the membrane surface were vanished and performed with GQDs after modification of membrane. The transport efficiency of chromium was found to be 97.23% through the modified membrane from 0.1 M HCl as donor phase to pH 5 as an acceptor phase. The system is available for long-term usage. The highly selective and mechanical strength of membrane is developed by adding GQDs. Modified membrane exhibits significant stability and selectivity, and the system is used for the real samples. Graphical Abstract: [Figure not available: see fulltext.].