Sürdürülebilir Kalkınma Amaçları

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Araştırmacılar(1)

• Güden, Gökay

• MakaleAçık Erişim2025Scopus SJRQ2/r/munzur/1393
  Synthesis of New Copolymer and Genotoxic Effects on Triticum aestivum L. (Wheat) Root Tip Cells

  Taşar, Neslihan; Torgut, Gülben

  In the present study, a copolymer of poly(N,N-dimethylacrylamide) and sodium acrylate was synthesized with the Solution Polymerization Technique. The purpose was to uncover the cytotoxic and genotoxic effects on root tip cells of the Triticum aestivum L. plant germinated with this polymer at different concentrations (25, 50, 100, and 200 ppm). The deposition of poly(DMAA-co-NaAc) copolymer in the study sample T. aestivum was demonstrated with the FTIR, UV–VIS spectroscopy analysis, X-Ray Diffraction (XRD) Spectroscopy, Scanning Electron Microscopy (SEM), SEM Element Map, and Energy Dispersive Spectroscopy (EDS) Spectrum. All concentrations of the poly(DMAA-co-NaAc) copolymer caused a decrease in the Mitotic Index (MI). The poly(DMAA-co-NaAc) copolymer caused various mitotic abnormalities such as loss of genetic material, deconstructed prophase, adhesion, chromosome groupings in metaphase, deconstructed metaphase, C-metaphase, chromosomal loss, chromosomal fracture, deconstructed anaphase, lagging chromosome, fragment, polar aberration, bridge, advancing, star anaphase, multipolarity, and deconstructed telophase. Study results show that poly(DMAA-co-NaAc) copolymer will cause abnormalities in mitosis as a result of its uptake by plants. These results also show that the poly(DMAA-co-NaAc) polymer, which affects organisms, must be produced in a controlled setting to reduce its accumulation in nature and ultimately disposed of in a way that will not harm the environment.

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• MakaleYalnız künye2025Scopus SJRQ2/r/munzur/928
  Response surface method (RSM) for optimization of electrical properties of polymer/CdS composites for dielectric capacitors

  Torğut, Gülben; İncesu, Rabia

  This paper aims to present the statistical evaluation of dielectric constant (έ) and conductivity (σ) performance of composites preparing Maleic Anhydride (MA) and Styrene (St) polymer with various amounts of Cadmium Sülfide (CdS) by analysis of variance (ANOVA) model. For this purpose, frequency, applied voltage and CdS amount at different weight percentages were selected as input factors while dielectric constant and conductivity of the composites were selected as the response. Analysis of input factors was performed, RSM method was designed and used for estimation of response factor. From the analysis results, we found that high values of dielectric constant and conductivity were strongly related to frequency and CdS amount. However, we found that applied voltage in the selected ranges did not have a significant effect on both factors. The structural properties of the composites were investigated by Fourier Transform Infrared Spectroscopy (FTIR). The surface morphology was investigated by Scanning Electron Microscopy (SEM). The presence of CdS in polymers has been proven by X-Ray Diffraction (XRD). The thermal properties of polymers were examined by thermogravimetric analysis (TGA).

  AtıfScopus1·WoS2·OpenAlex2

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• MakaleAçık Erişim2025Scopus SJRQ3/r/munzur/740
  COMPREHENDING GASTRONOMY FESTIVALS: A QUALITATIVE CASE STUDY ON ALANYA TROPICAL FRUIT FESTIVAL

  Güden, Gökay; Nebi̇Oğlu, Oğuz

  This study investigates the motivations for organizing gastronomy festivals, their management, the strategic approaches followed, and their role in tourism. The selected research area is Alanya in Turkey, which has recently emphasized gastronomy in its tourism-based activities, including through a tropical fruit festival. For this qualitative case study, data were collected using document analysis, a focus group, and face-to-face interviews. First, documents were obtained to understand Alanya’s festival history. A focus group meeting was then organized to prepare a semi-structured interview form. Finally, face-to-face interviews were conducted with the people responsible for the organization of Alanya Tropical Fruit Festival. The data were subjected to content analysis. The findings indicated that the festival is organized in Alanya for social, cultural, economic, and political reasons while festival management includes design, planning, operation, and evaluation processes. Resource-based strategies and emerging strategies are important while the festival plays encouraging, supportive, and complementary roles in the region’s tourism. These findings have several theoretical and practical implications.

  AtıfScopus1·WoS1·OpenAlex2

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• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/2189
  Development of a novel rare earth element doped chitosan-graft-poly(hydroxyethyl methacrylate) composite for biomedical applications: synthesis, characterization, drug delivery, and antibacterial properties

  Gürler, N.; Torǧut, G.; Yazdıç, F.C.; Karaman, A.; Karaaslan Ayhan, N.

  The films of chitosan-graft-poly(hydroxyethyl methacrylate) polymer (Ch—g-poly(HEMA)) doped with the rare earth element (REE) lanthanum (La content of 0, 0.2, 0.4, and 0.8 wt.%) were fabricated. The films were characterized by attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS), thermogravimetric analysis (TGA), and powder X-ray diffraction (XRD) analysis. The films obtained were loaded with a model drug tetracycline by freezing/thawing method. The cumulative drug release properties of tetracycline were investigated. The release of tetracycline from the polymer matrix was carried out in phosphate-buffered saline (PBS) buffer (pH 7.4) at 37 °C. It was found that the REE-doped composite films had a retarding effect on tetracycline drug release compared to that of the undoped film. All tested composites regardless of the REE dopant content were found to be active against three Gram-positive and three Gram-negative bacterial strains used to assess the antimicrobial properties of the polymer composites. These findings demonstrated that lanthanum and tetracycline have a high affinity for the Ch—g-poly(HEMA) polymer and suggested a synergistic effect in the polymer—lanthanum—tetracycline system. The La3+-doped Ch—g-poly(HEMA) composite film can be used as drug carrier system in the biomedical field.

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  AtıfScopus4·WoS4·OpenAlex3

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• MakaleAçık Erişim2024Scopus SJRQ2/r/munzur/1853
  Enhanced impedance, electrical conductivity, dielectric properties for colloidal starch-g-poly (methyl methacrylate) supported with semiconductor cadmium sulfide

  Torğut, Gülben; Gürler, Nedim

  In this study, starch-graft-poly (methyl methacrylate) (starch-g-PMMA) composites doped with different amounts (5, 10, and 15 wt%) of cadmium sulfide (CdS) particles were fabricated for electrical measurements using in-situ polymerization technique. The structural characterization of the samples was studied. The dielectric and conductivity properties of the composites were investigated using impedance analyzer depending on the frequency (100 Hz–20 kHz) at room temperature. Spectroscopy revealed that the dielectric constant (ε′), dielectric loss (ε′′), and real (Z) components of impedance are found to decrease with increasing frequency for both starch-g-PMMA and starch-g-PMMA (5, 10, and 15 wt%) composites. On the contrary, the AC conductivity (σac) of samples increased with increasing frequency. In addition, ε′ and ε′′ values of starch-g-PMMA were lower than composites that added CdS. When the CdS content increased from 0 to 15%, ε′ increased from 5.62 to 15.10 at 100 Hz. AC conductivity was improved after adding the CdS particles. The maximum conductivity value for starch-g-PMMA15%CdS is found to be 3.07 × 10–7 at 100 Hz. When the dielectric properties of composites are evaluated, it is concluded that it is an exciting material for electronic applications in technology.

  AtıfScopus9·WoS8·OpenAlex10

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• MakaleAçık Erişim2024Scopus SJRQ3/r/munzur/1565
  Structural, Dielectric, and Electrical Properties of Chitosan Composites Doped with Silver for Electrochemical Applications

  Ayhan, Nagihan Karaaslan; Torgut, Gulben

  In this study, chitosan-silver (Chs-Ag) composites containing Ag in different concentrations (0.01–0.08 M) were prepared. The characterization and structure studies of the composites containing 0.01, 0.02, 0.04, and 0.08 M Ag were carried out, and then the dielectric properties of these composites were examined. The composites were characterized by Fourier transform infrared spectrophotometer (FTIR), scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS), and thermogravimetric analysis (TGA). The dielectric and electrical properties of these composites were investigated depending on the frequency at room temperature, and these properties were determined using an impedance analyzer. Spectroscopy revealed that the dielectric constant (ε′), dielectric loss (ε′′), and real (Z′) and imaginary (Z″) components of impedance are found to decrease with increased frequency for both Chs and Chs-Ag (0.01M–0.08 M) composites. On the contrary, the AC conductivity (σac) of samples increased with increasing frequency. ε′ and ε′′ values of Chs were lower than when the Ag was added. The AC conductivity was improved by the addition of silver particles. The results show that the dielectric and electrical properties of Chs-Ag samples were improved by using Ag as filler.

  AtıfScopus3·WoS3·OpenAlex4

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• MakaleYalnız künye2023Scopus SJRQ1/r/munzur/2951
  Improving dielectric properties, electrical conductivity, and thermal properties of biodegradable polymer composites prepared with lanthanum

  Torgut, Gulben; Ayhan, Nagihan Karaaslan; Acikses, Aslisah

  The precipitation method was adapted to synthesize the poly(ε-caprolactone-copolymer- ethylene oxide) (ε-CL-co-EO) composite with the salt of lanthanum (La), a rare earth element. This salt was incorporated into the polymer of different weight percentages to study how it affects the thermal and dielectric properties of the polymer. The resulting products were characterized by Fourier Transform Infrared Spectroscopy, X-ray diffractometry (XRD), Scanning electron microscopy (SEM) and thermogravimetric analysis. XRD and SEM data show that the polymer mixes homogeneously with the metal salt. Thermal degradation data show that the thermal stability of composites synthesized with La is lower than that of pure polymer. The dielectric properties and A.C conductivity measurements of the composites were investigated by using impedance analyzer in the frequency range (100 Hz to 20 kHz) at room temperature. The electrical property results of (ε-CL-co-EO)/La composites displayed that dielectric constant (έ), dielectric loss (ε"), tan delta (tan δ) and A.C electrical conductivity (σac) increase with increasing La content. The largest conductivity of (ε-CL-co-EO)/La composite filled with 20 wt% La was 8.80 × 10−8 S/cm, which was 162% times pure (ε-CL-co-EO). In addition, impedance (IZI) of composites was evaluated from the dielectric data. This procedure is eco-friendly and easy to handle, which provides a promising route to polymer composites in the application of the conductivity field.

  AtıfScopus6·WoS6·OpenAlex7

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• MakaleYalnız künye2023Scopus SJRQ2/r/munzur/2104
  Antibacterial activity of novel synthesized chitosan-graft-poly(N-tertiary butylacrylamide)/neodymium composites for biomedical application

  Yazdıç, Ferit Can; Karaman, Altuğ; Torğut, Gülben; Ayhan, Nagihan Karaaslan

  In this present study, composites of chitosan-graft-poly(N-tertiary butylacrylamide) (CH-graft-poly(N‑tert‑BAAm)) copolymer, with Neodymium (Nd), an important rare earth element, were prepared by precipitation technique. Nd was successfully incorporated into the polymer of different weight percentages (0.5%, 1%, and 2%) without any degradation. The effect of neodymium additives on the structural, morphological, and antibacterial activities against gram-positive bacteria and gram-negative bacteria of the polymer was analyzed using various instrument techniques. X-ray diffraction (XRD) results together with Fourier Transform Infrared (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) studies confirmed the morphology of Nd-doped CH-graft-poly(N‑tert‑BAAm) composites without any other impurities. The antibacterial effect of Nd was studied by adding it to the copolymer in a weight ratio of 0.5%–2%. The antibacterial effect of neodymium concentration on four different strains of bacteria was investigated: Escherichia coli (ATCC 25922) (E. coli), Pseudomonas aeruginosa (DSM 50071) (P. aeruginosa), Bacillus subtilis (DSM 1971) (B. subtilis), and Staphylococcus aureus subsp. aureus (ATCC 25923) (S. aureus). The antibacterial activities of the obtained composites were determined using the Agar Well Diffusion Assay Method. Experimental results show that Nd binds well to CH-graft-poly(N‑tert‑BAAm). Activity against E. coli, P. aeruginosa, B. subtilis, and S. aureus subsp. aureus creates a potential for pharmaceutical and biomedical applications.

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  AtıfScopus8·WoS7·OpenAlex8

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• MakaleAçık Erişim2023Scopus SJRQ2/r/munzur/1949
  Binary PCL–waste photopolymer blends for biodegradable food packaging applications

  Gürler, Nedim; Pekdemir, Mustafa Ersin; Torğut, Gülben; Kök, Mediha

  The aim of this study is to prepare waste photopolymer (WPP) / poly ɛ-caprolactone (PCL) blends that can be used in food packaging with different ratios (5%, 10%, 20% and 30%) WPP. The structural properties of the blend films were characterized by attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Opacity, surface color, water vapor permeability and shape memory properties of these films were examined. Pure PCL film exhibited more thermal stability compared to PCL/WPP blend films. Therewithal, the glass transition temperature of the pure PCL film showed a shift. Water vapor permeability improved with the addition of WPP. L*, a* and transmittance values reduced with increasing WPP, but b* value increased. It was thought that these polymer blends would enable to be used as packaging material in terms of compatibility and waste evaluation.

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  AtıfScopus14·WoS13·OpenAlex14

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• MakaleYalnız künye2022Scopus SJRQ2/r/munzur/2891
  Physicomechanical, thermal and dielectric properties of eco-friendly starch-microcrystalline cellulose-clay nanocomposite films for food packaging and electrical applications

  Gürler, Nedim; Torğut, Gülben

  Potato starch (PS) films reinforced with microcrystalline cellulose (MCC) were prepared with casting solution, and the effect of montmorillonite (MMT) clay in different proportions (1, 3, 5 and 10 wt%) using nanofiller was established. The films were investigated by Fourier transform ınfrared (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), tensile strength, opacity, colour, water vapour permeability and solubility. Tensile strength for nanocomposite films depending on the clay content was increased significantly from 0.64 to 1.89 MPa. The water vapour permeability of nanocomposite films was improved compared to the PSMCC blend without MMT. Also, dielectric properties and electrical conductivity of films were studied. The dielectric permittivity (έ), the dielectric loss (ε˝) and the electrical conductivity (σ) increased with increasing MMT content at frequencies between 100 Hz to 10 kHz. This nanocomposite with improved functional properties could be used in potential food packaging materials and electrical applications.

  AtıfScopus21·WoS19

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