Yazar "PAŞAHAN, Aziz" seçeneğine göre listele

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    THE PREPARATION OF VARIOUS TEAR-CONTAINING CREAMS AND INVESTIGATION OF THEIR ANTIBACTERIAL PROPERTIES
    (2021) GÜRSES, Canbolat; UYAN, Melek; Kuruçay, Ali; PAŞAHAN, Aziz
    In our research, the antibacterial properties of tear which protect our eyes from many infections have been investigated by using Bacillus subtilis, Pseudomonas aeruginosa, Staphylococcus haemolyticus and Staphylococcus epidermidis bacteria. In addition, the antibacterial effect of creams in different formulations containing vaseline, also known as petroleum jelly, prepared by mixing olive oil and lemon juice which have been known and used throughout history with tears have been investigated. The antibacterial effect has been investigated measuring the zone of inhibition diameters, also known as the Kirby-Bauer method. It has been determined that all samples showed antibacterial effects except Staphylococcus epidermidis to which only tear was applied. The highest antibacterial activity with tear containing cream (vaseline and olive oil) has been observed for Pseudomonas aeruginosa and Staphylococcus epidermidis bacteria. In addition, tear containing cream (vaseline, olive oil and lemon juice) has shown the highest antibacterial effect against Bacillus subtilis and Staphylococcus haemolyticus bacteria.
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    VOLTAMMETRIC ANALYSIS OF MELATONIN AND DOPAMINE BY USING GRAPHENE OXIDE/POLYIMIDE BASED BIOSENSOR
    (2020) GÜNGÖR, Öznur; PAŞAHAN, Aziz; AKSOY, Büşra; Köytepe, Süleyman; SEÇKİN, Turgay
    In this research, for the simultaneous analysis of melatonin (MET) and dopamine (DP), graphene oxide/polyimide (GO/PI) composite electrode was prepared with the modification of Pt electrode. Firstly, GO/PI composite structure was synthesized from 2,6-diaminopyridine based polyimide and 5% GO. Then, the obtained composite structure as the membrane was coated on the electrode surface. MET and DP responses of the prepared GO/PI composite electrode were investigated by Differential Pulse Voltammetry (DPV) technique. Linearity was obtained over a concentration range of 85-105 µM for MET (R2 = 0.9976). For DP analysis, the linearity was also monitored over a concentration range of 85-105 µM (R2=0.9988). The detection limits of GO/PI modified electrode were approximately 13.45×10−5 M and 9.61×10−5 M for MET and DP, respectively. The prepared GO/PI composite modified electrode exhibited good repeatability, wide linear range and sensitivity for MET and DP. The obtained results indicated that while uric acid (UA) is present in the medium, GO/PI composite can be used as an excellent membrane in the design of voltammetric sensors to analyze MET and DP simultaneously.