15 results on '"Tuncel S"'
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2. Boron removal from RO permeate of geothermal water by monodisperse poly(vinylbenzyl chloride-co-divinylbenzene) beads containing N-methyl-d-glucamine
- Author
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Samatya, Saba, Tuncel, S. Ali, and Kabay, Nalan
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- 2015
- Full Text
- View/download PDF
3. [Determinação dos fatores que afetam o lucro por métodos quantitativos em empresas de frangos de carne]
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Tuncel,S. and Kara,E. Kizilok
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broiler enterprises ,análise de regressão ,broiler production ,husbandry ,integração de frangos de corte ,produção de frangos de corte ,empresas de frangos de corte ,pecuária ,broiler integration ,regression analysis - Abstract
This study was carried out to demonstrate how a regression model can be used as a decision support tool in the poultry sector, using variables that affect profit, within the scope of broiler enterprises that are engaged in contract production depending on broiler integrations. Enterprises included in the study were selected from Bolu, Sakarya and Ankara provinces those have the 24% of the rearing flocks and the integrations in Turkey. The 68 out of 9872 broiler enterprises existing in Turkey in 2017 were included in the study by random sampling method. The regression model obtained because of this study allows producers and institutions providing consultancy services in the broiler sector to monitor the marginal effect of variables that affect profit. As a result, when price and cost factors change under different risk conditions, the research model can be used as a decision support tool. RESUMO Este estudo foi realizado para demonstrar como um modelo de regressão pode ser utilizado como uma ferramenta de apoio à decisão no setor avícola, utilizando variáveis que afetam o lucro, dentro do escopo de empresas de frangos de corte que se dedicam à produção sob contrato, dependendo das integrações de frangos de corte. As empresas incluídas no estudo foram selecionadas das províncias de Bolu, Sakarya e Ancara, que possuem os 24% dos lotes de frangos de corte e as integrações na Turquia. As 68 das 9872 empresas de frangos de corte existentes na Turquia em 2017 foram incluídas no estudo pelo método de amostragem aleatória. O modelo de regressão obtido devido a este estudo permite aos produtores e instituições que prestam serviços de consultoria no setor de frangos de corte monitorar o efeito marginal das variáveis que afetam o lucro. Como resultado, quando os fatores preço e custo mudam sob diferentes condições de risco, o modelo de pesquisa pode ser usado como uma ferramenta de apoio à decisão.
- Published
- 2022
4. Determination of factors affecting profit by quantitative methods in broiler enterprises
- Author
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Tuncel, S., primary and Kara, E. Kizilok, additional
- Published
- 2022
- Full Text
- View/download PDF
5. Analysis of Different Production Systems in Laying Hen Enterprises with Analytic Hierarchy Process in Turkey
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Tuncel, S, primary, Sipahi, C, additional, Akçay, A, additional, Altin, O, additional, Sariözkan, S, additional, Gökdai, A, additional, Şahin, TS, additional, and Arikan, MS, additional
- Published
- 2021
- Full Text
- View/download PDF
6. Stable hemiaminals from axially chiral pyridine compounds
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Senel Teke Tuncel, Ilke Demir, Safiye Sağ Erdem, Ilknur Dogan, and Tuncel S. T., Demir I., ERDEM S., Dogan I.
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Temel Bilimler (SCI) ,Mühendislik ,ENGINEERING ,stable hemiami ,Sağlık Bilimleri ,Biochemistry ,Physical Chemistry ,Organik Kimya ,Kimya ,Analytical Chemistry ,CHEMISTRY ,Biyokimya ,BİYOKİMYA VE MOLEKÜLER BİYOLOJİ ,Drug Discovery ,Kimya Mühendisliği ve Teknolojisi ,FARMAKOLOJİ VE ECZACILIK ,MÜHENDİSLİK, KİMYASAL ,PHARMACOLOGY & PHARMACY ,Spectroscopy ,PHARMACOLOGY & TOXICOLOGY ,İlaç Keşfi ,intramolecular hydrogen bonding ,Temel Bilimler ,Basic Pharmaceutics Sciences ,Spektroskopi ,Fizikokimya ,Life Sciences ,CHEMISTRY, ORGANIC ,Kataliz ,KİMYA, ANALİTİK ,MOLECULAR BIOLOGY & GENETICS ,Farmakoloji ve Toksikoloji ,Natural Sciences (SCI) ,Physical Sciences ,pyridine compounds ,Engineering and Technology ,Natural Sciences ,BIOCHEMISTRY & MOLECULAR BIOLOGY ,Sitogenetik ,2-iminothiazolidin-4-ol ,axially chiral hemiaminal ,Farmakoloji ,Life Sciences (LIFE) ,Molecular Biology and Genetics ,Chemical Engineering and Technology ,Catalysis ,CHEMISTRY, ANALYTICAL ,SPEKTROSKOPİ ,KİMYA, ORGANİK ,Yaşam Bilimleri ,Health Sciences ,Biyoinorganik Kimya ,Cytogenetic ,Engineering, Computing & Technology (ENG) ,Eczacılık ,Bioinorganic Chemistry ,Moleküler Biyoloji ve Genetik ,stable hemiaminal ,Pharmacology ,Organic Chemistry ,Mühendislik, Bilişim ve Teknoloji (ENG) ,Pharmacology and Therapeutics ,Temel Eczacılık Bilimleri ,Fizik Bilimleri ,Yaşam Bilimleri (LIFE) ,Analitik Kimya ,Mühendislik ve Teknoloji ,ENGINEERING, CHEMICAL - Abstract
© 2023 Wiley Periodicals LLC.In this study, we have synthesized a series of 3-(pyridin-2-yl)-2-(pyridin-2-ylimino)thiazolidin-4-ol derivatives regioselectively from 2-iminothiazolidin-4-ones using LiAlH4 at room temperature. Due to the presence of the restricted rotation around the N3-Caryl single bond, the formation of M/P isomers was observed. The OH group of the hemiaminal was found to orient itself on the same side with pyridyl nitrogen during this restricted rotation to form an intramolecular hydrogen bond, which was demonstrated by the computational DFT study. This orientation presumably inhibited the occurrence of dehydration and stabilized the molecule.
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- 2023
- Full Text
- View/download PDF
7. Manyetik silika bazlı borat afinite kromatografisi sorbentlerinin sentezi ve kromatografik performanslarının incelenmesi
- Author
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Süngü, Çağıl Zeynep, Tuncel, Süleyman Ali, Önel, Selis, Biyomühendislik Anabilim Dalı, Tuncel, S. Ali, and Biyomühendislik
- Subjects
Molekül Baskılama ,Biyomühendislik ,Mikrokromatografi ,Borat Afinite Kromatografisi ,Oligonükleotid ,Bioengineering ,Borik Asit - Abstract
In this study, β-nicotinamide adenine dinucleotide (β-NAD) was molecularly imprinted onto plain and magnetic silica microspheres in the monodisperse-porous form, by core-shell polymerization method. For this purpose, ethylene glycol dimethacrylate was used as crosslinking agent. For both sorbent species, at alkali pH values, β-NAD showed high binding affinity against phenylboronic boronic acid group and the molecular imprinting was achieved by cyclic boronate ester formation between diol and boronic acid moieties. Following to imprinting, β -NAD was removed from the imprinted microspheres with lauryl sulfate-acetic acid solution. As a control group, bare and magnetic silica microspheres were prepared by the same method without using β-NAD molecule as the template. Molecularly imprinted and non- imprinted silica microspheres were analyzed in terms of their size, morphology, the porous properties through Scanning Electron Microscopy, Transmission Electron Microscopy, Fourier Transform Infrared Spectroscopy and nitrogen adsorption-desorption method. The target molecule isolation behavior was investigated by using borate affinity chromatography with β-NAD-imprinted, bare and magnetic silica microspheres as the sorbents. First, the isolation behavior was investigated by changing the target molecule concentration, sorbent type and concentration in the batch system. The imprinting factors ranging between 2.30-3.38 for bare and magnetic silica microspheres were obtained in batch system. Subsequently, β-NAD-imprinted monodisperse silica microspheres were used as a stationary phase in a microcolumn and β-NAD isolation was carried out by borate affinity micro-chromatography in the continuous system. The results showed that the developed sorbent could be successfully used in the continuous system for the isolation of biomolecules containing diol groups by micro-borate affinity chromatography. İÇİNDEKİLER Sayfa ÖZET ...........................................................................................................................................i ABSTRACT...............................................................................................................................iii TEŞEKKÜR…………………………………………………………………………………….v İÇİNDEKİLER ………………………………………………………………………………. vi ÇİZELGELER DİZİNİ ............................................................................................................... x ŞEKİLLER DİZİNİ .................................................................................................................. xi SİMGELER ve KISALTMALAR ........................................................................................... xiv 1. GİRİŞ ...................................................................................................................................... 1 2. GENEL BİLGİLER ................................................................................................................ 3 2.1.Molekül Baskılama Yöntemi ................................................................................................ 3 2.1.1. Şablon Molekül …………………………………………………………………………4 2.1.2. Monomerler ve Çapraz Bağlayıcılar…………………………………………………….4 2.1.3. Gözenek Yapıcı Çözücü ………………………………………………………………...6 2.1.4. Başlatıcı……………………………………………………………………………….....6 2.2. Molekül Baskılama Teknikleri…………………………………………………………….7 2.2.1.Yığın Baskılama ………………………………………………………………………….7 2.2.2. Yüzey Baskılama………………………………………………………………….…......7 2.2.3. Çekirdek-Kabuk Metodu .................................................................................................. 8 2.3. Molekül Baskılamanın Kullanım Alanları ........................................................................ 10 2.3.1. Analitik Ayrımlar ........................................................................................................... 10 2.3.2. Sensörler ......................................................................................................................... 12 2.3.3. İlaç Salınımı .................................................................................................................... 13 2.4. Nükleotid ve Nükleositlerin Molekül Baskılaması ........................................................... 14 2.5. β-Nikotinamid Adenin Dinükleotid ................................................................................... 16 2.6. Borat Afinite Kromatografisi............................................................................................. 18 2.7. Monodispers Silika Mikroküre Sentezi ............................................................................. 21 3.DENEYSEL ÇALIŞMA ...................................................................................................... 24 3.1. Molekül Baskılama İçin Destek Materyali Sentezi ........................................................... 24 3.1.1. Çekirdek Malzeme Olarak Kullanılan Silika Mikrokürellerin Sentezi .......................... 24 3.1.1.1. Kullanılan Kimyasal Malzemeler ................................................................................ 24 3.1.1.2. Monodispers Polimerik Mikrokürelerin Sentezi ......................................................... 25 3.1.1.2.1. Poli(glisidil metakrilat) Mikroküre Sentezi .............................................................. 25 3.1.1.2.2.Poli(metakrilik asit-co-etilen glikol dimetakrilat), Poli(MAA-co-EGDMA) Mikrokürelerin Sentezi……………………………………..…………………………………25 3.1.1.3. Monodispers-Gözenekli Silika Mikrokürelerin Sentezi .............................................. 26 3.1.1.4. Manyetik Özellikte Monodispers-Gözenekli Silika Mikrokürelerin Sentezi .............. 27 3.1.2.Normal ve Manyetik Formdaki Destek Materyallerine Molekül Baskılama Yapılması..28 3.1.2.1. Kullanılan Malzemeler ................................................................................................ 28 3.1.2.2. Normal Silika Mikrokürelere Molekül Baskılama Yapılması ..................................... 30 3.1.2.3. Manyetik Özelliğe Sahip Silika Mikrokürelere Molekül Baskılama Yapılması……..31 3.2. Molekül Baskılamada Kullanılan Mikrokürelerin Karakterizasyonu ............................... 32 3.2.1. Yüzey Alan Ölçümü ....................................................................................................... 32 3.2.2. Taramalı Elektron Mikroskobu ...................................................................................... 33 3.2.3. Geçirimli Elektron Mikroskobu ..................................................................................... 34 3.2.4. Fourier Dönüşümlü Kızılötesi Spektroskopisi ............................................................... 34 3.2.5. Titreşimli Örnek Manyetometrisi Analizi ...................................................................... 35 3.2.6. Kolon Basınç Testi ......................................................................................................... 35 3.3. Molekül Baskılanmış Sorbentler ile Adsorpsiyon/Desorpsiyon Deneyleri......…………..35 3.3.1. Kesikli Sistem Adsorpsiyon Deneyleri........................................................................... 36 3.3.1.1. Sorbent Derişiminin Etkisi .......................................................................................... 36 3.3.1.2. İzoterm Eldesi .............................................................................................................. 36 3.3.1.3. Spektrofotometrik Yöntemle β-NAD Derişiminin Tayini .......................................... 38 3.3.1.4. Kesikli Sistemde Tekrar Kullanılabilirlik ................................................................... 39 3.3.1.5. Farklı Moleküller ile Adsorpsiyon Deneyleri………………………………………...39 3.3.2. Sürekli Sistemde Adsorpsiyon Deneyleri ....................................................................... 41 3.3.2.1. Mikro-kolonda Tekrar Kullanılabilirlik Deneyleri……………………………...……43 4. SONUÇ ve TARTIŞMALAR .............................................................................................. 44 4.1. Karakterizasyon ................................................................................................................. 44 4.1.1. Gözeneklilik Analizi Sonuçları ...................................................................................... 44 4.1.2. Mikrokürelerin Morfolojik Analizi ................................................................................ 48 4.1.3. Mikrokürelerin Yığın Yapısı .......................................................................................... 51 4.1.4. Mikrokürelerin FTIR-ATR Analizi ................................................................................ 54 4.1.5. Mikrokürelerin VSM Analizi ......................................................................................... 57 4.1.6. Kolon Geri Basınç Testi ................................................................................................. 59 4.2. MIP ve NIP için β-NAD Adsorpsiyon Deneyleri .............................................................. 59 4.2.1. Kesikli Sistem Çalışmaları ............................................................................................. 60 4.2.1.1. Sorbent Derişiminin Etkisi…………………………………………………………...60 4.2.1.2. β-NAD Başlangıç Derişiminin Denge Adsorpsiyonu Üzerindeki Etkisi………….....62 4.2.1.3. Tekrar Kullanılabilirlik Testleri………......……………………………………….…65 4.2.1.4. Seçicilik ………………………………………………………………………….… .66 4.2.2. Mikroakışkan Sistemde β-NAD Adsorpsiyon Deneyleri................................................68 4.2.2.1. Kolonda Tekrar Kullanılabilirlik .................................................................................69 5. SONUÇLAR ......................................................................................................................... 72 KAYNAKLAR ......................................................................................................................... 75 ÖZGEÇMİŞ .............................................................................................................................. 81 Tez kapsamında β-nikotinamid adenin dinükleotid (β-NAD), çekirdek-kabuk polimerizasyonu yöntemiyle normal ve manyetik özelliğe sahip monodispers-gözenekli silika mikroküreler üzerine moleküler olarak baskılanmıştır. Bu amaçla etilen glikol dimetakrilat çapraz bağlayıcı olarak kullanılmıştır. Her iki sorbent türü için alkali pH değerinde β-NAD, fenilborik aside yüksek bağlanma afinitesi göstermiş ve diol ile borik asit grupları arasında tersinir borat esteri oluşumu yoluyla baskılama sağlanmıştır. Molekül baskılama işleminin ardından β-NAD, mikrokürelerin yüzeyinden lauril sülfat-asetik asit çözeltisi ile uzaklaştırılmıştır. Kontrol grubu olarak, molekül baskılama yapılmayan normal ve manyetik silika mikroküreler, β-NAD molekülü kullanılmadan aynı yöntemle hazırlanmıştır. Molekül baskılanan ve baskılanmayan silika mikrokürelerin boyutu, morfolojisi ve gözeneklilik özellikleri Taramalı Elektron Mikroskobu, Geçirimli Elektron Mikroskobu, Fourier Transform Infrared Spektroskopisi ve Azot Adsorpsiyon Desorpsiyon Yöntemi ile analiz edilmiştir. β-NAD baskılanmış, normal ve manyetik silika mikrokürelerin sorbent olarak kullanımıyla, borat afinite kromatografisi yöntemi kullanılarak, hedef molekül izolasyon davranışı incelenmiştir. İlk olarak, izolasyon davranışı kesikli sistemde hedef molekül derişimi, sorbent türü ve derişimi değiştirilerek çalışılmıştır. Kesikli sistemde, normal ve manyetik silika mikroküreler için 2.30-3.38 aralığında değişen molekül baskılama faktörü değerleri elde edilmiştir. Ardından β-NAD baskılanmış monodispers silika mikroküreler mikrokolonda sabit faz olarak kullanılmış ve sürekli sistemde mikro-borat afinite kromatografisi ile β-NAD izolasyonu gerçekleştirilmiştir. Sonuçlar, geliştirilen molekül baskılanmış sorbentin sürekli sistemde, mikro-borat afinite kromatografisi yöntemiyle diol grubu içeren biyomoleküllerin izolasyonunda başarıyla kullanılabileceğini göstermiştir.
- Published
- 2018
8. Silika destekli manyetik formda plazmonik katalizör tasarımı ve kesikli reaktör sisteminde katalitik aktivitenin tayini
- Author
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Balcı, Tuğra, Tuncel, Süleyman Ali, Kimya Mühendisliği Anabilim Dalı, Tuncel, S. Ali, and Kimya Mühendisliği
- Subjects
Fenolik Kirleticiler ,Polymeric microshepere ,Polymeric particles ,Paramagnetic materials ,Metal oxide catalyst ,Manyetik Katalizör ,Nanoparticles ,Chemical Engineering ,Plazmonik Katalizör ,Gözenekli Mikroküreler ,Kimya Mühendisliği ,Au Nanopartikül - Abstract
In this thesis, monodisperse-porous silica microbeads in a magnetic form were synthesized by new sol–gel templating method. Primary amine groups were formed on SiO2 microbeads by covalent immobilization. In the following step, Au nanoparticles were fixed onto the SiO2 microbeads by using primary amine groups. Magnetic SiO2 microbeads carrying Au nanoparticles were used as plasmonic catalyst for removal of phenol by Fenton based degradation mechanism in a batch reactor. Size distribution, surface morphology and the specific surface area of magnetic catalyst microbeads were investigated by scanning electron microscopy (SEM) and nitrogen adsorption/desorption method, respectively. The phenol removal efficiency was determined in an HPLC (High Pressure Liquid Chromatography) system equipped with a reversed phase column. In the presence of Au nanoparticle containing magnetic SiO2 microbeads, the relationship between Au nanoparticle size and phenol removal efficiency was investigated. The most appropriate pH for phenol removal was determined. Besides, the effects of catalyst concentration, Au nanoparticle content of catalyst, and the initial concentrations of phenol and hydrogen peroxide on the phenol removal mechanism were investigated. The recyclability of the developed plasmonic catalyst was also investigated and successful results were obtained. The results showed that, phenol could be degraded by the silica supported magnetic plasmonic catalyst via Fenton-reaction with high yield. - ÖZET i ABSTRACT ii TEŞEKKÜR iii İÇİNDEKİLER iv ÇİZELGELER vii ŞEKİLLER viii SEMBOLLER VE KISALTMALAR xi 1.GİRİŞ 1 2. LİTERATÜR İNCELEMESİ 3 2.1 Silisyum dioksit (Silika) 3 2.2 Silika Sentezi 3 2.2.1 Sol-Gel Metodu 4 2.2.2 Sol-Gel Kalıplama Metodu 6 2.2.3 Organik Başlatıcı ile Sol-Gel Metodu 6 2.3. Polimer Taslağının Sentezlenmesi 7 2.3.1 Dispersiyon Polimerizasyonu 7 2.3.2 Çok Basamaklı Mikrosüspansiyon Polimerizasyonu ile Fonksiyonel, Eş Dağılımlı Gözenekli Partikül Sentezi 8 2.4. Silisyum Dioksit Uygulamaları 8 2.4.1. Fenton Bazlı Giderimde Katalizör Olarak Kullanılması 9 2.5. Fenton Bazlı Giderimi Etkileyen Faktörler 11 2.5.1. SiO2’nin Yapısal Özellikleri 11 2.5.2. Katalizör Miktarı 12 2.5.3. Reaktant Başlangıç Konsantrasyonu 12 2.5.4. pH 12 2.5.5. Hidrojen Peroksit Miktarı 13 2.6. SiO2’in Aktivitesinin Artırılması 13 2.6.1. Altın Nanopartikül Sentezlenmesi 13 2.6.2.Turkevich Metodu 14 2.6.3. Martin Metodu 14 2.6.4. Manyetik Nanopartikül Sentezlenmesi 14 3. MATERYAL VE METOT 16 3.1. Tekil Dağılımlı Makrogözenekli Polimerik Mikrokürelerin Sentezi 16 3.1.1. Materyaller 16 3.1.2. Çıkış Lateksinin Sentezlenmesi 17 3.1.3. Çok Basamaklı Mikrosüspansiyon Polimerizasyonu 17 3.1.4. Poli(MAA-co-EDMA) Mikrokürelerin Manyetizasyonu 18 3.2. Manyetik Tekil Dağılımlı Makrogözenekli Silika Mikrokürelerin Sentezi 19 3.2.1 Materyaller 19 3.2.2 Hidroliz ve Kondenzasyon Reaksiyonu ile Silika Mikrokürelerin sentezi 19 3.3 Altın Nanopartiküllü Manyetik Tekil Dağılımlı Silikanın Sentezlenmesi 19 3.3.1 Materyaller 19 3.3.2. Manyetik Tekil Dağılımlı-gözenekli Formda Silikanın Aminopropiltrietoksisilan ile Türevlendirilmesi 20 3.4. Altın Nanopartikül Sentezi 21 3.4.1. Martin Metodu ile Altın Nanopartikül Sentezi 21 3.4.2. Turkevich Metodu ile Altın Nanopartikül Sentezi 21 3.4.3. Manyetik Tekil dağılımlı -Gözenekli Formda Silika Yüzeyine Altın Nanopartiküllerin Immobolize edilmesi 22 3.5. Manyetik Tekil dağılımlı -Gözenekli Formda Silika Bazlı Mikrokürelerin Karakterizasyonu 22 3.5.1. Taramalı Elektron Mikroskobu (SEM) 22 3.5.2. Yüzey Alanı Ölçümü 24 3.5.3. X-ışınları spektroskopisi 24 3.5.4. Titreşimli örnek magnetometresi 25 3.6. Fenol’ün Altın Nanopartikül Destekli Manyetik Tekil Dağılımlı Silika Mikroküreler ile Fenton Bazlı Giderimi 25 3.6.1. Materyal 25 3.6.2. Fenolün Fenton Bazlı Giderimi 26 3.6.3 Katalitik Aktivite Deneylerinde Kullanılan Kesikli Sistem ve Özellikleri 28 4. SONUÇLAR ve TARTIŞMA 31 4.1 Tekil dağılımlı - Gözenekli Polimerik Mikrokürelerin ve Manyetik Polimerik Mikrokürelerin Karakterizasyonu 31 4.2 Manyetik Tekil dağılımlı -Gözenekli Silika Formundaki Mikrokürelerin Karakterizasyonu 35 4. Altın Nanopartikül Destekli Manyetik Tekil dağılımlı Gözenekli Silika Mikrokürelerin Karakterizasyonu 37 4.4 Fenolün Altın Nanopartikül Destekli Manyetik Silika Mikroküreler Kullanılarak Fenton Bazlı Giderimi 40 4.4.1 Yüklenen Altın Boyutunun Etkisi 42 4.4.2. pH Etkisi 44 4.4.3. Hidrojen Peroksit Konsantrasyonunun Etkisi 45 4.4.4. Katalizör Etkisi 45 4.4.5. Fenol Konsantrasyonun Etkisi 46 4.4.6. Yüklenen Altın Miktarının Etkisi 47 4.4.7 Tekrar Kullanılabilirlik 48 5. GENEL SONUÇLAR 50 KAYNAKLAR 53 ÖZGEÇMİŞ 60 Çalışmada tekil dağılımlı-gözenekli formda manyetik SiO2 mikroküreler yeni geliştirilen bir sol-jel kalıplama yöntemiyle sentezlenmiştir. SiO2 mikrokürelerin yüzeyinde kovalent immobilizasyon yoluyla primer amin grupları oluşturulmuştur. Takip eden basamakta Au nanopartiküller oluşturulan primer amin grupları kullanılarak SiO2 mikrokürelerin gözenekli yapısı içerisinde sabitlenmiştir. Manyetik formda ve Au nanopartikül içeren SiO2 mikroküreler mekanik kontrollu kesikli reaktörde fenolün Fenton-bazlı giderim mekanizması ile giderimi için kullanılmıştır. Kürelerin yüzey özellikleri ile boy dağılımları taramalı elektron mikroskobu ile özgül yüzey alanı ölçümleri de Brunauer-Emmett-Teller (BET) Yüzey Alanı ve Gözenek Boyutu Ölçüm Cihazı kullanılarak belirlenmiştir. Çalışmada giderim verimi, Yüksek Basınçlı Sıvı Kromotografisi cihazında ölçülmüştür. Au nanopartikül içeren manyetik SiO2 mikroküreler ile fenolün Fenton-bazlı giderim veriminin Au nanopartikül boyutu ile ilişkisi incelenmiştir. Fenol giderimi için en uygun pH değeri tayin edilmiştir. Ayrıca, katalizör derişimi, katalizörün Au nanopartikül içeriği, fenol ve hidrojen peroksit başlangıç derişiminin fenol giderim mekanizmasına etkisi incelenmiştir. Sentezlenen katalizörlerin tekrar kullanılabilirliği incelenmiş ve başarılı sonuçlar elde edilmiştir. Sonuçta, silika destekli manyetik formda plazmonik katalizör kullanılarak kesikli sistemde yüksek verimle Fenton-bazlı fenol gideriminin yapılabileceği gösterilmiştir.
- Published
- 2018
9. A New State-Based Connectivity Model For Peer-To-Peer Networks
- Author
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Sinan Tuncel, Halil Arslan, Arslan, H, Tuncel, S, Sakarya Uygulamalı Bilimler Üniversitesi/Teknoloji Fakültesi/Elektrik Ve Elektronik Mühendisliği Bölümü, Arslan, Halil, and Tüncel, Sinan
- Subjects
Computer science ,business.industry ,020206 networking & telecommunications ,02 engineering and technology ,Peer-to-peer ,computer.software_genre ,World Wide Web ,NAT traversal ,Artificial Intelligence ,Hardware and Architecture ,Computer Science ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Computer Vision and Pattern Recognition ,State (computer science) ,Electrical and Electronic Engineering ,business ,computer ,Software ,Computer network - Abstract
The usage of peer-to-peer (P2P) networks that provide sharing of real-time environmental data by internet users is becoming more and more popular. As a result, it's necessary to identify the problems during P2P communication and to develop proper solutions. One of the major problems of P2P communication is that it's not possible to reach the clients behind devices that create private networks like network address translation (NAT) and firewalls from the public network. Among the solutions proposed for this problem, Interactive Connectivity Establishment (ICE) and Real Time Media Flow Protocol (RTMFP) are the methods most preferred in the literature. These methods seem more attractive than other NAT traversal mechanisms since they are independent from internet infrastructure and are also appropriate for dynamic structures. However, they do have some disadvantages. In this study, a new state-based end-to-end communication technique (SBN) for NAT traversal was designed and realized. The performance of the designed method was evaluated against three criteria, connectivity check delay, connection packet count and bandwidth, and compared with the ICE method. The results revealed that the suggested SBN method proved an average of 78% success in connectivity check delay, 69% in the number of packets used and 66% in the consumption of bandwidth over the ICE method.
- Published
- 2016
10. Reaktif Poliakrilat Kapiler Monolitlerin Sentezi Ve Hidrofilik Etkileşim Kromatografisinde Sabit Faz Olarak Kullanımı
- Author
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Erkakan, Sedef Damla, Tuncel, S. Ali, and Kimya Mühendisliği
- Subjects
HPMA-Cl ,Triethanolamine ,Chromatographic separation ,Hydrophilic interaction chromatography (HILIC) ,Monolith ,EDMA - Abstract
THE PREPARATION OF REACTIVE-POLYACRYLATE CAPILLARY MONOLITHS AND THEIR USE AS STATIONARY MEDIA IN HYDROPHILIC INTERACTION CHROMATOGRAPHY Sedef Damla Erkakan Master of Science, Department of Chemical Engineering Supervisor: Prof. Dr. Ali TUNCEL September 2015, 66 pages In this study, the synthesis of new polar polymer-based monoliths was performed and their chromatographic performance in hydrophilic interaction chromatography (HILIC) mode was determined. Poly(HPMA-Cl-co-EDMA) monoliths were prepared via thermally initiated block copolymerization into silanized capillary fused silica tubes having 100 µm internal diameter. In the synthesis stage, concentrations of monomer, cross-linking agent and porogen in the polymerization solution and polymerization temperature were changed. The effects of each of these changes on the structure of monolith were investigated. After obtaining appropriate pore size distribution, specific surface area and back pressure values, a chromatographic ligand, triethanolamine (TEA-OH) was covalently attached to monolith via a single step reaction. These newly produced monolithic columns with different pore structures and polarities were used successfully for the separation of nucleotides, nucleosides and benzoic acids. All chromatographic studies were performed by using acetonitrile/aqueous buffer system as the mobile phase. In the chromatographic studies, the lowest plate height was obtained as 20 µm using uracil (nucleotide), 54 µm using thymidine (nucleoside) and 25 µm for benzoic acid derivatives. According to chromatographic results, it was seen that efficient separations of benzoic acid derivatives were mainly based on hydrophilic interaction mechanisms. Under optimized separation conditions, TEA-OH attached monoliths was successfully applied for the rapid, high resolution and without obvious peak tailing separation with lower than 5 % column to column relative standard deviation values for each nucleotides. However, the first time introduced “retention-dependent column efficiency” behavior for the HILIC system ii showed that the plate height raised with increasing retention factor. Its possible reasons were discussed. In this study, the first monolithic column which is capable of separating polar analytes in HILIC mode was synthesized in our country. In the light of these results, better separation efficiencies can be achieved with further studies. ÖZET REAKTİF POLİAKRİLAT KAPİLER MONOLİTLERİN SENTEZİ VE HİDROFİLİK ETKİLEŞİM KROMATOGRAFİSİNDE SABİT FAZ OLARAK KULLANIMI Sedef Damla Erkakan Yüksek Lisans, Kimya Mühendisliği Bölümü Tez Danışmanı: Prof. Dr. Ali TUNCEL Eylül 2015, 66 sayfa Bu çalışmada yeni bir polar polimer esaslı monolit sentezi yapılmış ve hidrofilik etkileşim kromatografisi (HILIC) modunda kromatografik performansları incelenmiştir. Poli(HPMA-Cl-co-EDMA) monolitler 100 µm iç çapına sahip olan silanlanmış silika kapiler tüplerde termal başlatıcılı blok kopolimerizasyonu yöntemi ile hazırlanmıştır. Sentez aşamasında, polimerizasyon çözeltisindeki monomer, çapraz bağlayıcı ve gözenek yapıcı konsantrasyonları ve polimerizasyon sıcaklığı değiştirilmiş ve bu değişimlerin monolit yapısı üzerindeki etkisi araştırılmıştır. Uygun gözenek boyutu dağılımı, özgül yüzey alanı ve geri basınç değerleri elde edildikten sonra, kromatografik ligand, trietanolamin (TEA-OH) tek basamaklı bir reaksiyon ile monolite kovalent olarak bağlanmıştır. Farklı gözenek yapıları ve polaritelere sahip olan monolitik kolonlar, nükleotid, nükleosid ve benzoik asitlerin kromatografik ayrımında başarılı bir şekilde kullanılmıştır. Bütün kromatografik çalışmalar, hareketli faz olarak asetonitril/su veya asetonitril/sulu tampon sistemi kullanılarak gerçekleştirilmiştir. Kromatografik çalışmalarda, en düşük plaka yüksekliği nükleotidler ile 20 µm, nükleosidler ile 54 µm ve benzoik asit türevleri ile 25 µm olarak elde edilmiştir. Kromatografik sonuçlar, benzoik asitlerin ayırımının hidrofilik etkileşim mekanizması ile oluştuğunu göstermiştir. TEA-OH bağlanmış monolitler % 5 den az tekrarlanabilirlik değeri ile hızlı, yüksek çözünürlüklü ve pik yayılımı olmadan analitlerin ayırımına başarılı bir şekilde uygulanmıştır. Ancak HILIC modunda ilk kez ortaya koyulmuş olan “alıkonma faktörüne bağlı kolon verimliliği” davranışı, kolon yüksekliğinin alıkonma faktörünün artması ile arttığını göstermiştir. Bunun mümkün olabilecek nedenleri tartışılmıştır. Bu çalışmanın sonunda, ülkemizde iv HILIC modda polar analitleri ayırma yeteneğine sahip ilk monolitik kolonun sentezlenmiş olduğu ifade edilebilir. Bu sonuçlar ışığında, ileriki çalışmalarda daha iyi ayırma verimleri elde edilebilir.
- Published
- 2015
11. Enantiodifferentiation of Thiohydantoin Derivatives by NMR in the Presence of Chiral Solvating Agent: (1R,2S)-Ephedrine and Chiral Symmetrical and Unsymmetrical Thioureas.
- Author
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Sarigul Ozbek S, Teke Tuncel S, Erol Gunal S, and Dogan I
- Abstract
2-Thiohydantoin derivatives, including different substitutions at N-1 and C-5 (5-methyl-, 5-isopropyl-, 1-acetyl-5-methyl-, and 1-acetyl-5-isopropyl-) (1-4, respectively), were synthesized by the known literature methods. In these synthetic pathways, it was reported that enantiomerically pure 2-thiohydantions were obtained in the absence of any solvent via the reaction of L-amino acids with thiourea (1&2) and via the reaction of L-amino acids with NH
4 SCN and acetic anhydride (3&4). However, in this study, in contrary to the previous literature studies, racemic mixtures of 2-thiohydantoins were obtained although the same synthetic methods were used. The racemic nature of 2-thiohydantoin derivatives (1-4) was proved by using1 H NMR analysis in the presence of (1R,2S)-(-)-ephedrine as a chiral auxiliary. In addition, the enantiomers of 3&4 were also resolved on chiral stationary phases by HPLC analyses. Furthermore, newly synthesized unsymmetrical chiral thioureas (S-1&S-2) and previously synthesized symmetrical ones (SS-3&SS-4) were used as chiral solvating agent (CSA) for the enantiodiscrimination of the thiohydantoins (5&6), previously reported. Optimal CSA/substrate ratios were determined for the best enantiodiscrimination., (© 2025 Wiley Periodicals LLC.)- Published
- 2025
- Full Text
- View/download PDF
12. Investigating Child Abuse in Sports: An Ecological Systems Perspective.
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Güler D, Güler Y, Cengiz C, Tuncel S, and Karayiğit R
- Abstract
Background: This study examines child abuse in sports environments through Ecological Systems Theory, revealing the multifaceted nature of abuse and the impact of environmental factors at various levels., Methods: With a study design using the phenomenology approach, a qualitative research method, data were collected through semi-structured, in-depth interviews with 11 Turkish participants, including 5 athletes, 4 coaches, and 2 academics with coaching experience in Sports Sciences. Thematic analysis was used to evaluate the data, categorizing findings into four levels: microsystem, mesosystem, exosystem, and macrosystem., Results: Findings show that at the microsystem level, children are exposed to physical, emotional, and sexual abuse, as well as neglect, largely through interactions with coaches and teammates. Physical abuse includes non-contact forms, like dehydration and forced training, and contact abuse, such as violence from coaches and peers. Emotional abuse manifests through psychological pressures and verbal attacks, creating a toxic environment. At the mesosystem level, excessive parental trust in coaches reduces oversight, leaving children vulnerable. In the exosystem, inadequate supervision of coaches and a lack of response to abuse cases by sports clubs worsen the issue. At the macrosystem level, cultural norms and societal attitudes normalize abuse, especially affecting female athletes., Conclusions: The study highlights the need for comprehensive interventions, including family awareness, stricter coach oversight, and robust policies within sports organizations to protect children. By emphasizing the interaction of individual, familial, and societal factors, this research underscores the importance of collective efforts to ensure safer sports environments.
- Published
- 2024
- Full Text
- View/download PDF
13. Asymmetric synthesis, molecular modeling and biological evaluation of 5-methyl-3-aryloxazolidine-2,4-dione enantiomers as monoamine oxidase (MAO) inhibitors.
- Author
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Erol Gunal S, Teke Tuncel S, Gokhan Kelekci N, Ucar G, Yuce Dursun B, Sag Erdem S, and Dogan I
- Subjects
- Cell Survival drug effects, Dose-Response Relationship, Drug, Hep G2 Cells, Humans, Kinetics, Models, Molecular, Molecular Structure, Monoamine Oxidase Inhibitors chemical synthesis, Monoamine Oxidase Inhibitors chemistry, Oxazoles chemical synthesis, Oxazoles chemistry, Stereoisomerism, Structure-Activity Relationship, Monoamine Oxidase metabolism, Monoamine Oxidase Inhibitors pharmacology, Oxazoles pharmacology
- Abstract
Single enantiomers of the new 5-methyl-3-aryloxazolidine-2,4-diones have been obtained either by an asymmetric synthesis using the chiral pool strategy or by a semipreparative resolution of the racemic compound by HPLC on an optically active stationary phase. The single enantiomers were assayed for their in vitro monoamine oxidase (hMAO) inhibitory activity and selectivity. The most potent inhibitor among the studied compounds has been found as (5R)-3-phenyl-5-methyl-2,4-oxazolidinedione (compound 1-R) which appeared to be a good antidepressant drug candidate since it inhibited hMAO-A selectively, competitively and reversibly with K
i values in the micromolar range (0.16 ± 0.01 μM). To better understand the enzyme-inhibitor interaction and to explain the efficiency and selectivity of the compounds toward hMAOs, molecular modeling studies were carried out on new, high resolution hMAO-A and hMAO-B crystallographic structures. According to binding energies and inhibition constants obtained from molecular docking calculations, compound 1-R has been found as the most selective MAO-A inhibitor and its weak binding affinities to MAO-B (large Ki values) led to the enhancement in MAO-A selectivity. It bounded in close proximity to FAD in the active site of MAO-A and situated near the aromatic cage by means of π-alkyl interactions with Tyr407 and Phe352 whereas its position in MAO-B was 10 Å far from FAD and it was situated outside the Ile199 gate of the active site. None of the studied compounds showed any cytototoxicity on HepG2 cells at 1 and 5 µM concentrations., (Copyright © 2018 Elsevier Inc. All rights reserved.)- Published
- 2018
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14. Copper Phthalocyanine Functionalized Single-Walled Carbon Nanotubes: Thin Films for Optical Detection.
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Banimuslem H, Hassan A, Basova T, Durmuş M, Tuncel S, Esenpinar AA, Gürek AG, and Ahsen V
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- Dimethylformamide chemistry, Electric Conductivity, Indoles chemistry, Nanotubes, Carbon chemistry, Optical Phenomena, Organometallic Compounds chemistry
- Abstract
Thin films of non-covalently hybridized single-walled carbon nanotubes (SWCNT) and tetra-substituted copper phthalocyanine (CuPcR4) molecules have been produced from their solutions in dimethylformamide (DMF). FTIR spectra revealed the 7π-7π interaction between SWCNTs and CuPcR4 molecules. DC conductivity of films of acid-treated SWCNT/CuPcR4 hybrid has increased by more than three orders of.magnitude in comparison with conductivity of CuPcR4 films. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements have shown that films obtained from the acid-treated SWCNTs/CuPcR4 hybrids demonstrated more homogenous surface which is ascribed to the highly improved solubility of the hybrid powder in DMF Using total internal reflection ellipsometry spectroscopy (TIRE), thin films of the new hybrid have been examined as an optical sensing membrane for the detection of benzo[a]pyrene in water to demonstrate the sensing properties of the hybrid.
- Published
- 2015
- Full Text
- View/download PDF
15. Correction to "assessing the dual activity of a chalcone-phthalocyanine conjugate: design, synthesis, and antivascular and photodynamic properties".
- Author
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Tuncel S, Trivella A, Atilla D, Bennis K, Savoie H, Albrieux F, Delort L, Billard H, Dubois V, Ahsen V, Caldefie-Chézet F, Richard C, Boyle RW, Ducki S, and Dumoulin F
- Published
- 2015
- Full Text
- View/download PDF
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