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  • Küçük Resim
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    BAZI AMİNOASİT GÜMÜŞ TUZLARININ SENTEZİ VE KARAKTERİZASYONU
    (Düzce Üniversitesi, 2018) Aydın, Pinar; Karagül, Bora; Karadeniz, Seref; Uğraş, Halil İbrahim
    Aminoasitler fizyolojik olarakbirçok hayatı fonksiyonun yerine getirilmesinde önemli rol oynayan proteinlerinyapı taşlarını oluşturmaktadırlar. Son yıllarda yapılan bir çok çalışmadaaminoasitlerin bu önemli fizyolojik görevinin yanı sıra bir çok alanda dakullanım sahasının olduğu ortaya çıkarılmıştır. Bu önemli kullanım alanlarından bir tanesi de aminoasitlerin korozyonönleyici etkilerinin belirlenmesine yönelik gerçekleştirilen çalışmalarolmuştur. Gerçekleştirilen çeşitli çalışmalarda doğal aminoasitlerin çeşitlimateryaller üzerindeki korozyon inhibitörü etkileri incelendiği gibi bazıaminoasitlerden elde edilen iyonik sıvıların da korozyon inhibitörü özellikleride yoğun bir şekilde incelenmiştir. Gerçekleştirmiş olduğumuz bu çalışmadaçeşitli katyonik merkezli prokesörler ile anyon değişim reaksiyonu vererekiyonik sıvılar elde etmeye aday bazı aminoasit gümüş tuzlarının sentezigerçekleştirilmiştir. Sentezlenen bileşiklerin yapıları FouirerTransform Infrared Spektrofotometresi (FT-IR) ve ihtiva ettikleri gümüşatomu miktarları ise Inductively Coupled Plasma Mass Spectrometer (ICP-MS)Spektrofotometresi ile tayin edilmiştir.
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    PREPARING AND OPTIMIZING A NEWLY AFFINITY GEL FOR PURIFICATION OF CARBONIC ANHYDRASE ISOENZYMES
    (Parlar Scientific Publications (P S P), 2020) Uzunoglu, Serap Beyaztas; Yalcin, Yildiz; Uzunoglu, Tayfun; Karadeniz, Seref; Kurt, Habibe
    Human carbonic anhydrase isozymes have been purified from the hemolysate, directly by using the original affinity gel in chemical structure of Sepharose 4B-L-tyrosine- sulfathiazole. Different solution buffers were used for obtaining the purified CA isozymes from the affinity column. Most suitable elution buffers were determined for CA I and CA II isoenzymes pH 6.3, 25 mM Na2HPO4/1.0 M NaCl and pH 5.6, 0.1 M NaCH3COO / 0.5 M NaClO4 respectively. The purification values for CA I and CA II have been obtained as 635.71 and 666.71 folds with 28.41% and 46.19% yield respectively. The ionic strength and optimum pH values of the original affinity gel have been determined for each isozyme of CA. Maximum binding was achieved 0.3 ionic strength and pH 8.7 for both CA I and CA II. The single bands was indicated for each isoenzymes by SDS-polyacrylamide gel electrophoresis.
  • Küçük Resim Yok
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    Synthesis, dielectric and thermal performance of PVA nanocomposites with cadmium-based quantum dots
    (Pamukkale Univ, 2025) Demirci, Tuna; Elibol, Erdem; Karadeniz, Seref
    Hybrid polymer structures formed with semiconductor quantum dots that are doped into the polymer matrix and whose optical properties can be adjusted have attracted attention with their high usage potential in electronic applications in recent years. In this study, three types of Cd-based QD (CdX (X=Se, Te, SeTe)) were used to strengthen the poly (vinyl alcohol) (PVA) matrix and increase its optical properties. Optical, conductivity and thermal characterizations ofPVA/3 different Cd-based QDs CdSe QD-PVA nanocomposites structures were evaluated comparatively. With the addition of QDs, it was observed that the PVA / QDs nanocomposites structure exhibits fluorescence properties. Hybridization structures in PVA/QDs nanocomposites structures were illuminated by FT-IR spectrum. In addition, it was determined that the thermal stability of hybrid polymer structures increased between 7-9% and the melting point of PVA/QDs hybrid polymers increased by 5-7 degrees C which was analyzed by DSC. The highest thermal stability and melting point increases were observed in PVA/CdSeTe QDs hybrid structures. With the addition of CdSe QDs and CdTe QDs into the PVA matrix, the conductivity value of the hybrid polymer structure increased 100 times, while the addition of CdSeTe QDs increased the conductivity by 1000 times. Similarly, in dielectric constant and dielectric loss tests, it was determined that PVA/ CdSeTe QDs hybrid polymer structures are more successful than both types due to the synergic effect.