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    Alleviation of everzol red LFB toxicity in duckweed (Lemna minor L.) by exogenous salicylic acid
    (Kahramanmaraş Sütçü İmam Üniversitesi, 2020) Beker Akbulut, Gülçin; Özhan Turhan, Duygu; Yiğit, Emel
    Salicylic acid (SA) has an important function in the formation of induced systemic resistance. The aim of this study was to determine effects of exogenous application of 0.5 mM SA on the stress response in duckweed (Lemna minor L.) exposed to the reactive dyestuff Everzol Red LFB (ER LFB). Phytotoxic responses induced by exposure to both ER LFB (75 ppm, 150 ppm and 300 ppm) and 0.5 mM SA+ ER LFB (75 ppm, 150 ppm and 300 ppm) applications were comparatively examined at 1st, 4th, and 7th days. The lowest chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (total Chl) contents were found in the 300 ppm ER LFB groups. The carotenoid (Car) content was decreased compared to control groups. The highest total glutathione (GSH), glutathione S-transferase (GST) and peroxidase (POD) activities were found after 0.5 mM SA + 300 ppm ER LFB groups at 7th day. Glutathione reductase (GR) activity was reduced at 7th day. The level of lipid peroxidation, measured as malondialdehyde (MDA) content was increased generally both ER LFB and SA+ER LFB groups compared to control groups. Results suggest that SA plays a positive role in L. minor against ER LFB.
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    Different Plant Sporopollenin Exine Capsules and Their Multifunctional Usage
    (American Chemical Society, 2022) Atalay, Funda Ersoy; Culum, Ayşe Asiye; Kaya, Harun; Göktürk, Günay; Yiğit, Emel
    poropollenin exine capsules (SECs) are highly resistant to heat and various acids and bases. They are also cheap, highly porous, eco-friendly polymer biomaterials with stable microencapsulation capacity. Due to their strong and uniquely shaped exine layers, they can allow growth on metal oxide materials, as a biotemplate for use in different applications. In this study, first, a single SEC extraction method was applied to three different pollens from Pinus, Fraxinus excelsior, and Tilia. Scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, and thermogravimetric/differential thermal analysis (TGA/DTA) measurements both before and after the extraction process were performed to observe changes in surface area, morphology, porous structure, and degradation properties. The protein content and removal were analyzed by elemental and spectrophotometric analyses. Then, SECs were loaded by passive and centrifuge loading for drug delivery, and the loading capacities were analyzed by Fourier transform infrared spectroscopy and spectrophotometry. The method was successful in opening the pores and maintaining the structural integrity of SECs. It was determined that the morphology and porosity affected the encapsulation efficiency. According to the loading capacities, Tilia SECs were the most efficient SECs for both loading methods. In addition, three different SECs were hydrothermally coated with cobalt and then heat-treated to obtain a metal oxide structure. A CO3O4supercapacitor electrode constructed using CO3O4-F. excelsior SEC powder had the best surface area parameters. The electrode showed a maximum specific capacity of 473 F/g for over 3000 continuous cycles of galvanostatic charge-discharge (GCD). © 2022 American Chemical Society. All rights reserved.
  • Küçük Resim
    Öğe
    Different Plant Sporopollenin Exine Capsules and Their Multifunctional Usage
    (American Chemical Society, 2022) Atalay Ersoy, Funda; Kaya, Harun; Göktürk, Günay; Yiğit, Emel; Çulum, Ayşe Asiye
    Sporopollenin exine capsules (SECs) are highly resistant to heat and various acids and bases. They are also cheap, highly porous, eco-friendly polymer biomaterials with stable microencapsulation capacity. Due to their strong and uniquely shaped exine layers, they can allow growth on metal oxide materials, as a biotemplate for use in different applications. In this study, first, a single SEC extraction method was applied to three different pollens from Pinus, Fraxinus excelsior, and Tilia. Scanning electron microscopy (SEM), Brunauer?Emmett?Teller (BET) analysis, and thermogravimetric/differential thermal analysis (TGA/DTA) measurements both before and after the extraction process were performed to observe changes in surface area, morphology, porous structure, and degradation properties. The protein content and removal were analyzed by elemental and spectrophotometric analyses. Then, SECs were loaded by passive and centrifuge loading for drug delivery, and the loading capacities were analyzed by Fourier transform infrared spectroscopy and spectrophotometry. The method was successful in opening the pores and maintaining the structural integrity of SECs. It was determined that the morphology and porosity affected the encapsulation efficiency. According to the loading capacities, Tilia SECs were the most efficient SECs for both loading methods. In addition, three different SECs were hydrothermally coated with cobalt and then heat-treated to obtain a metal oxide structure. A CO3O4 supercapacitor electrode constructed using CO3O4-F. excelsior SEC powder had the best surface area parameters. The electrode showed a maximum specific capacity of 473 F/g for over 3000 continuous cycles of galvanostatic charge?discharge (GCD).