Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 31Citation - Scopus: 35Electrochemical Investigation of Biomolecular Interactions Between Platinum Derivatives and Dna by Carbon Nanotubes Modified Sensors(Elsevier Ltd., 2010) Yapaşan, Ece; Çalışkan, Ayfer; Karadeniz, Hakan; Erdem, ArzumThe biomolecular interactions of platinum derivatives widely used as anticancer drugs: cis-diamminedichloroplatinum(II) and oxaliplatin with calf thymus double-stranded DNA were studied using differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) in combination with single-walled carbon nanotubes modified graphite electrode (SWCNTs-GE) and unmodified graphite electrode (bare GE). The performance of these biomolecular interactions were explored at the electrode surface by monitoring the changes at guanine oxidation signal in terms of optimum interaction times by comparing the results of SWCNTs-GE with bare one. The features of these electrochemical sensors based on carbon nanotubes for monitoring of biomolecular interactions were discussed and compared with the earlier conventional ones. © 2009 Elsevier B.V. All rights reserved.Article Citation - WoS: 6Citation - Scopus: 6Investigation of the Spontaneous Emission Rate of Perylene Dye Molecules Encapsulated Into Three-Dimensional Nanofibers Via Flim Method(Springer Verlag, 2014) Açıkgöz, Sabriye; Demir, Mustafa Muammer; Yapaşan, Ece; Kiraz, Alper; Ünal, Ahmet A.; İnci, Mehmet NaciThe decay dynamics of perylene dye molecules encapsulated in polymer nanofibers produced by electrospinning of polymethyl methacrylate are investigated using a confocal fluorescence lifetime imaging microscopy technique. Time-resolved experiments show that the fluorescence lifetime of perylene dye molecules is enhanced when the dye molecules are encapsulated in a three-dimensional photonic environment. It is hard to produce a sustainable host with exactly the same dimensions all the time during fabrication to accommodate dye molecules for enhancement of spontaneous emission rate. The electrospinning method allows us to have a control over fiber diameter. It is observed that the wavelength of monomer excitation of perylene dye molecules is too short to cause enhancement within nanofiber photonic environment of 330 nm diameters. However, when these nanofibers are doped with more concentrated perylene, in addition to monomer excitation, an excimer excitation is generated. This causes observation of the Purcell effect in the three-dimensional nanocylindrical photonic fiber geometry.