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• Tıbbi Laboratuvar Teknikleri Pr.

Araştırmacılar(4)

• Alp, Cemalettin
• Durmaz, Lokman
• Keskin, Bülent
• Yavuz, Emre

• ArticleAçık Erişim2023/r/ebyu/19194
  Microwave-Assisted Fabrication of Pd, Co and Ni Nanoparticles Modified-SiO2; as Catalysts in the Reduction Reaction of Organic Pollutants

  Dayan, Serkan; Yavuz, Sevtap Çaglar; Yavuz, Emre

  Nanomaterials have been used in catalytic degradation of organic pollutants also act as catalysts in for many years. Due to excellent catalytic performances of metal-based nanoparticles, these materials have been used extensively in various hybrid catalyst synthesis. The main subject of this study, heterogeneous catalysis is a low cost and multi-purpose process for many pollutants. Catalytic degradation of organic pollutants such as; 2-nitrophenol, quinolin yellow and rhodamine B was investigated by using Ni, Co, Pd nanoparticles modified SiO2 based nanomaterials. The co-doping effect on the prepared nanomaterials has been investigated with different characterization methods in terms of structural and morphological features: scanning electron microscopy, UV/vis absorption spectroscopy, energy-dispersive X-ray spectroscopy and foruier-transform infrared spectroscopy. The highest catalytic reduction efficiencies (97.6% and 97.5%) for 2-nitrophenol and rhodamine B was obtained by Pd-PEG-AP@SiO2 respectively. The synthesized Co-PEG-AP@SiO2 illustrated higher catalytic reduction efficiency for quinolin yellow (70.1%) at the end of 60s. The prepared M-PEG-AP@SiO2 nanomaterial (M: Pd,Co,Ni) can be able to utilized degradation of organic contaminants effectively.

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• ArticleYalnız künye2022/r/ebyu/18488
  Ni-Zn metal-organic framework based membranes for rejection of Pb (II) ions

  Senol-Arslan, Dilek; Gül, Ayse; Uzal, Nigmet; Yavuz, Emre

  The present paper describes a sustainable and affordable supply of clean, and safe water approach to investigate Ni-Zn MOF embedded membrane for rejection of Pb (II) ions in aqueous solution. Ni-Zn MOF powder was prepared by solvo-thermal method, and then the Ni-Zn MOF embedded membranes with various concentrations (0.025 wt%, 0.05 wt% and 0.1 wt%). The membranes were fabricated by a common phase inversion method. Phase solutions of Pb(II) prepared with PVP at different concentrations in aqueous solutions. Water filtration and Pb (II) rejection tests were operated on a batch scale. The prepared Ni-Zn MOF powder characterized by FTIR, SEM-EDX analyses and zeta potential measurements. Ni-Zn MOF membranes were characterized by FTIR, SEM-EDX analysis, contact angle, and water permeability measurements. The effects of important parameters on adsorption including concentration and pH were investigated. The obtained results indicated that the maximum rejection of Pb(II) was 98% for a feed solution containing 80 mg Pb/L at pH 8 and assistance with 2 % PVP for 0.05 wt% Ni-Zn MOF membrane. Additionally, it was detected that blend membranes revealed better Pb(II) rejection than pure PSF membrane.

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• ArticleAçık Erişim2022/r/ebyu/20524
  İnterferon Beta-1a İlacının Enzim İnhibisyon Etkilerinin İncelenmesi

  Durmaz, Lokman

  Bu araştırmada, interferon beta-1a (IFNβ-1a) ilacının enzim inhibisyon etkileri araştırılmıştır. Bu amaçla IFNβ-1a ilacının insan eritrosit karbonik anhidraz izoenzimi I ve II (hCA I ve II) ile asetilkolinesteraz (AChE), bütirilkolinesteraz (BChE) enzimleri üzerine in vitro da enzim analizleriyle enzim inhibisyon etkileri açıklanmıştır. Bununla birlikte Sepharose-4B-L-Tirozin afinite kolon kromatografisi ile hCA I ve II izoenzimleri insan eritrositlerinden saflaştırıldı. Ardından IFNβ-1a ilacının hCA I, II izoenzimleri ve AChE, BChE enzimleri üzerine inhibisyon etkileri belirlenmiştir ve IC50 ve Ki değerleri hesaplanmıştır. Bu çalışmada hCA I izoenzimi için IC50 ve Ki değerleri sırasıyla 1.73 μM ve 0.78 ± 0.21μM olduğu bulunmuştur. Aynı parametreler hCA II izoenzimi için 1.33 μM ve 1.46 ± 0.13μM olduğu hesaplanmıştır. Enzim ile ilgili yapılan çalışmalarda IC50 ve Ki değerleri AChE enzimi için sırasıyla 13.86 μM ve 14.47 ± 4.81μM olduğu bulunmuştur. Enzim ile ilgili yapılan çalışmalarda son olarak IC50 ve Ki değerleri BChE enzimi için sırasıyla 18.72 μM ve 12.80± 4.38 μM olduğu bulunmuştur. Enzim ile ilgili yapılan çalışmalarda her iki CA izoenzimi için asetazolamit, AChE ve BChE enzimleri için ise Takrin standart olarak kullanılmıştır

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• ArticleYalnız künye2021/r/ebyu/20797
  Teachers’ views on the use of interactive boards in education

  Keskin, Bülent; Köse, Esra Özay

  Use of interactive whiteboards; It is essential to understand better and comprehend the subjects in education and training, attract students’ attention, encourage their desire to learn, support the teacher, and make the teaching more qualified. In this sense, it is obvious that interactive boards placed in classrooms within the scope of the FATİH project positively affect the course process, revealing different gains and positively affect learning. In addition, it is thought that it is important to know the various situations that occur during the use of the interactive board in the educational environment and to take precautions for effective use. In the research, the qualitative research design was used to determine teachers’ experiences working in secondary education institutions during the use of interactive whiteboards. Using the semi-structured interview technique, 32 teachers were asked about their situations while using the interactive boards. As a result of the analysis, the situations teachers encounter while using the interactive boards were collected under eight themes to increase the effectiveness of interactive boards. Software situations, e-content situations, and situations encountered during the course process are at the top of the teachers’ situations. The most common situations faced by teachers, such as visual disturbances or the inability to prevent sunlight sufficiently, negatively affect the viewing of the interactive board, the inability to see the screen clearly for the classroom environment, the position of the board, and the elimination of environmental conditions such as lighting are among the top priorities.

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• ArticleAçık Erişim2021/r/ebyu/20048
  Lallemantia canescens (L) Fisch & Mey. Bitkisinin Antimikrobiyal Aktivitesinin Araştırılması

  Akyüz, Sümeyye; Köksal, Ekrem; Altay, Ahmet; Alp, Cemalettin; Altin, Sevgi; Yeniçeri, Esma Kübra Kağan

  Bitkilerin zararlı mikroorganizmaları öldürücü etkileri ile ilgili yapılan çalışmalar onların sağlık açısından önemli ve değerli bir kaynak haline gelmelerini sağlamıştır. Türkiye üç fitocoğrafik bölgenin birleşim merkezi olmasından dolayı zengin florasıyla sayısız tıbbi ve aromatik bitkiye ev sahipliği yapmaktadır. Bu çalışmada Türkiye’de “Topajdarbaşı” olarak bilinen L. canescens bitkisinin toprak üstü kısımlarının hekzan, etilasetat, metanol ve su ekstrelerinin antimikrobiyal aktivitesi araştırılmıştır. Bitki örnekleri Erzincan İli Pöske Dağı bölgesinden toplanmıştır. Ekstraktların antimikrobiyal aktiviteleri; standart Gram negatif bakterilere (Pseudomonas aeruginosa, Klebsiella pneumoniae, kolistin dirençli Escherichia coli, Escherichia coli) ve standart Gram pozitif bakterilere (Enterococcus faecalis, Staphylococcus aureus, Streptococcus pneumoniae) karşı Kirby-Bauer disk difüzyon yöntemi ile belirlenmiştir. L. Canescens’in hekzan, etilasetat ve metanol ekstreleri S. aureus, E. faecalis, S. pneumoniae suşlarına karşı antimikrobiyal aktivite göstermiştir.

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