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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3

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Department: search.filters.department.Department of Molecular Biology and GeneticsSubject: search.filters.subject.Physics

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    Atmospheric pressure plasma jet treatment of human hair fibers
    (2015) N/A; N/A; Department of Molecular Biology and Genetics; Department of Chemistry; Birer, Özgür; Acar, Erhan; Keleş, Merve; Öngel, Cansu; Researcher; Master Student; Undergraduate Student; Undergraduate Student; Department of Molecular Biology and Genetics; Department of Chemistry; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); N/A; Graduate School of Sciences and Engineering; College of Science; College of Science; N/A; N/A; N/A; N/A
    Human hair fibers in virgin and dyed forms were treated with atmospheric pressure helium, helium/oxygen, argon, and argon/oxygen plasma jets at 20 W of power. The effects of 10-min plasma treatment on surface morphology and chemistry were studied by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. The plasma treatment was quite effective for removing the organic residues from the surface and creating oxidized functional groups. Helium plasma had a mild cleaning effect on the surfaces while argon/oxygen plasma had the strongest corrosive effect. Mild hydrogen peroxide treatment for the same duration had neither the cleaning nor the oxidizing power of the plasma jets. These types of plasma jets have the potential to replace peroxide treatment. The corrosive jets can be used to restore dyed hair fibers. In addition, the jets can be used to clean the surfaces of hair fibers to prepare samples for analytical investigations where the organic residues may induce problems. © 2015, Springer International Publishing AG.
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    Fluorescent protein integrated white LEDs for displays
    (Iop Publishing Ltd, 2016) N/A; Department of Electrical and Electronics Engineering; N/A; N/A; Department of Molecular Biology and Genetics; Department of Electrical and Electronics Engineering; Press, Daniel Aaron; Melikov, Rustamzhon; Çonkar, Deniz; Karalar, Elif Nur Fırat; Nizamoğlu, Sedat; Researcher; PhD Student; PhD Student; Faculty Member; Faculty Member; Department of Molecular Biology and Genetics; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; College of Engineering; N/A; N/A; N/A; 206349; 130295
    The usage time of displays (e.g., TVs, mobile phones, etc) is in general shorter than their functional life time, which worsens the electronic waste (e-waste) problem around the world. The integration of biomaterials into electronics can help to reduce the e-waste problem. In this study, we demonstrate fluorescent protein integrated white LEDs to use as a backlight source for liquid crystal (LC) displays for the first time. We express and purify enhanced green fluorescent protein (eGFP) and monomeric Cherry protein (mCherry), and afterward we integrate these proteins as a wavelength-converter on a blue LED chip. The protein-integrated backlight exhibits a high luminous efficacy of 248 lm/W-opt and the area of the gamut covers 80% of the NTSC color gamut. The resultant colors and objects in the image on the display can be well observed and distinguished. Therefore, fluorescent proteins show promise for display applications.
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    Laser emission from single, dye-doped microdroplets situated on a superhydrophobic surface
    (IEEE, 2007) Department of Physics; Department of Physics; Department of Physics; Department of Chemistry; N/A; Department of Physics; Department of Molecular Biology and Genetics; Sennaroğlu, Alphan; Kurt, Adnan; Kiraz, Alper; Demirel, Adem Levent; Dündar, Mehmet Ali; Kalaycıoğlu, Hamit; Doğanay, Sultan; Faculty Member; Teaching Faculty; Faculty Member; Faculty Member; Master Student; PhD Student; Undergraduated Student; Department of Chemistry; Department of Physics; Department of Molecular Biology and Genetics; College of Sciences; College of Sciences; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; 23851; 194455; 22542; 6568; N/A; N/A; N/A
    Optical microcavities are attractive in developing ultralow threshold lasers which hold a great promise for applications in optical communications systems and fundamental studies in cavity quantum electrodynamics. Up to date laser emission has been observed from various different optical microcavities: Microdisks, microspheres, micropillars, photonic crystal defect microcavities, and microdroplets flying in air. Here we report the observation of laser emission from single, stationary, dye-doped microdroplets situated on a superhydrophobic surface. In contrast to the previous demonstrations on microdroplets flying in air, the technique we use allows for the analysis of laser emission from a particular microdroplet over prolonged periods.