Yazar "Emre F.B." seçeneğine göre listele

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    Assessment of phytotoxic and genotoxic effects of anatase TiO2 nanoparticles on maize cultivar by using RAPD analysis
    (Parlar Scientific Publications, 2018) Mutlu F.; Yurekli F.; Mutlu B.; Emre F.B.; Okusluk F.; Ozgul O.
    In this study, early phytotoxic and genotoxic effects of chemically synthesized nano-TiO2 (anatase) were investigated in seedlings of maize (Zea mays cv. Hido). Control (Hoagland) and NaCl (300 mM) groups were administered with nano-TiO2 (0.1%, 0.2% and 0.3%). Seed germination and seedling growth parameters of maize cultivar were markedly inhibited by salt stress. Nano-TiO2, without depending on concentration, was found to be ineffective on germination percentage in all administrations. On the contrary, nano-TiO2 caused significant increases in root-stem length and fresh-dry weights especially in NaCl+nano-TiO2 administrations. In salt administered samples, 0.3% nano-TiO2 increased root length 1.4 fold, stem length 4.8 fold, and fresh weight 1.2 fold. Genotoxic properties of nano-TiO2 in seedlings of maize were evaluated by using randomly amplified polymorphic DNA (RAPD-PCR). In RAPD analysis, 20 RAPD primers were found to produce unique polymorphic band profiles at different concentrations of nano-TiO2 maize seedlings. Genomic template stability (GTS), a qualitative measurement of changes in RAPD patterns of genomic DNA, decreased depending on increasing nano-TiO2, NaCl, and NaCl+nano-TiO2 concentrations. Therefore, it could be concluded that nano-TiO2 of appropriate dose can be used to ameliorate negative effects of salt stress by increasing growth potential of maize. © by PSP.
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    Preparation of Poly (N-Isopropylacrylamide)-Poly (2-Ethyl-2-Oxazoline) and Their Self-Assembly Properties with Dicarboxylic Acid
    (Turkish Chemical Society, 2024) Yilmaz Erdogan P.; Emre F.B.; Seçkin T.
    This study reports the synthesis of copolymers that contain thermally responsive polymers, namely poly(N-isopropylacrylamide) (PNIPAM) and poly(2-ethyl-2-oxazoline) (PEOX), as well as biodegradable side groups that are water-soluble and capable of hydrogen bonding. The assay aims to produce heat-responsive PNIPAM and PEOX polymers with di-carboxylic acid (DCA) controlled structuring of the resulting pH-sensitive nano-structured polymers. These will be used as a template in the synthesis of inorganic materials. The study demonstrated the impact of pH, salt concentration, and temperature on the polymer/DCA. This fragment describes the functional groups of the thermosensitive polymers PNIPAM and PEOX. These polymers have carboxylic acid functional groups at both ends, are water soluble, and are capable of hydrogen bonding. The structure of these polymers can be recognized with small molecules of DCA in an aqueous solution at different pH, salt concentrations, and temperatures with H-bonds. Additionally, these polymers can be used as templates to synthesize hollow silica polymers. The synthesized monomers and polymers were structurally characterized using Fourier transform infrared spectrophotometer (FT-IR). The resulting structured polymers were identified by scanning electron microscopy and atomic force microscopy (SEM, AFM). UV-VIS spectrophotometer and Differential Scanning Calorimetry (DSC) were used to determine the Lower Critical Solution temperature of the polymers. © 2024, Turkish Chemical Society. All rights reserved.