Umut Bulut, Vuslat Öykü Sayın, Yasin Altın, Şevki Can Cevher, Ali Çırpan, Ayşe Çelik Bedeloğlu, Saniye Söylemez,
Tópico(s): Analytical Chemistry and Sensors
2022 - Elsevier BV | Microchemical Journal
Umut Bulut, Serdar Şanlı, Şevki Can Cevher, Ali Çırpan, Sude Donmez, Suna Tımur,
Abstract A novel benzenediamine‐benzodithiophene polymer is synthesized for use in biosensor fabrication for the detection of testosterone. The sensory platform is constructed via drop coating on a screen‐printed carbon electrode, using poly(benzenediamine‐Bis[(2‐ethylhexyl)oxy]benzodithiophene) (pBDBT) as the polymer layer. Testosterone antibodies are immobilized on the polymer‐coated electrode surface via glutaraldehyde, which binds to the surface through the amino functional groups on the polymer ...
Tópico(s): Hormonal and reproductive studies
2020 - Wiley | Journal of Applied Polymer Science
Özgür Akgül, Ömer Faruk Baycan, Ümit Bulut, Mustafa Umut Somuncu, Hamdi Püşüroğlu, Sinem Özyılmaz, Mehmet Gül, Ali Rıza Demir, Emre Yılmaz, Serkan Yazan, Uğur Köktürk, İlyas Çetin, Hüseyin Uyarel,
Objectives The prognostic value of pentraxin 3 (PTX3) has been documented in patients with acute coronary syndrome. However, its long-term prognostic value in acute ST-segment elevation myocardial infarction (STEMI) remains unclear. The aim of this study was to evaluate the prognostic value of PTX3 in patients with STEMI undergoing a primary percutaneous coronary intervention (PCI). Methods We prospectively enrolled 499 consecutive STEMI patients undergoing primary PCI. The high-PTX3 group (n=141) was ...
Tópico(s): Biomarkers in Disease Mechanisms
2015 - Lippincott Williams & Wilkins | Coronary Artery Disease
Bengisu Corakci, Şerife O. Hacıoğlu, Levent Toppare, Umut Bulut,
This article describes the use of functionalized quinoxaline derivatives as photosensitizers for diaryliodonium salt photoinitiators. Highly conjugated compounds with good absorption bands in long wavelength UV and visible region are presented. These versatile intermediates facilitate photoinitiated cationic polymerization of commercially important monomers such as cyclic ethers and vinyl epoxides. Polymerizations were carried out using long wavelength UV light in the presence of diphenyliodonium ...
Tópico(s): Photochromic and Fluorescence Chemistry
2013 - Elsevier BV | Polymer
Umut Bulut, Merve Kolay, Simge Tarkuç, Yasemin Arslan Udum, Levent Toppare,
Abstract The present paper is focused on visible light initiated cationic polymerizations. Photoinitiated polymerization of representative vinyl ether and oxirane monomers using two quinoxaline derivatives; namely (2-(2,3-dihydrobenzo [b][1,4]dioxin-6-yl)-3-(2,3-dihydrobenzo[b]-[1,4]dioxin-7-yl)-5-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-8-(2,3-dihydrothieno[3,4-b][1,4]dioxin-7yl) quinoxaline) (DBQEd) and 2,3,5,8-tetra(thiophen-2-yl)quinoxaline (TTQ) are studied. Novel dyes based on the quinoxaline ...
Tópico(s): Oxidative Organic Chemistry Reactions
2011 - Elsevier BV | Progress in Organic Coatings
Umut Bulut, Görkem Günbaş, Levent Toppare,
Abstract This article reports the use of a quinoxaline derivative as a photosensitizer for diaryliodonium salt photoinitiators. 2,3‐bis(3,4‐bis(decyloxy)phenyl)‐5,8‐bis(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)quinoxaline (DOPEQ), is a highly conjugated compound with strong absorption bands at wavelengths ranging from 300 to 550 nm and is shown to facilitate photoinitiated cationic polymerization of heterocyclic monomers such as oxiranes and oxetanes. The polymerizations are initiated at room temperature ...
Tópico(s): Radical Photochemical Reactions
2009 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
James V. Crivello, Umut Bulut,
Abstract Curcumin, an intensely yellow dye isolated from Indian turmeric is an excellent electron‐transfer photosensitizer for cationic vinyl and ring‐opening polymerizations. Especially attractive features of curcumin are its strong absorption, broad spectral sensitivity, efficient electron‐transfer, low toxicity and low cost. Using curcumin as a photosensitizer, the cationic photopolymerizations of a variety of monomers were carried out including such naturally derived monomers as epoxidized terpenes ...
Tópico(s): Photochromic and Fluorescence Chemistry
2006 - Wiley | Macromolecular Symposia
James V. Crivello, Umut Bulut,
Abstract Selective inhibition of the photoinitiated cationic ring‐opening polymerization of epoxides by dialkyl sulfides has provided dual systems that can be “activated” by UV irradiation and then subsequently be polymerized by the application of heat. It is proposed that dialkyl sulfides terminate the initial or growing polyether chains at an early stage to form stable trialkylsulfonium salts. These systems are dormant at room temperature but on thermolysis, the sulfonium salts are capable of reinitiating ...
Tópico(s): Silicone and Siloxane Chemistry
2006 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
Abstract The photoinitiated cationic ring-opening polymerizations of 3,3-disubstituted oxetanes display a characteristic induction period followed by very rapid thermally accelerated polymerization. When a thin-film sample of such a monomer is irradiated for a time within the induction period and then allowed to stand at room temperature, no appreciable further conversion of monomer to polymer takes place. However, when heat is applied to a small portion of the films rapid polymerization takes place ...
Tópico(s): Photochromic and Fluorescence Chemistry
2005 - Taylor & Francis | Designed Monomers & Polymers
Umut Bulut, James V. Crivello,
Abstract Studies of the onium salt photoinitiated cationic ring‐opening polymerizations of various 3,3‐disubstituted oxetane monomers have been conducted with real‐time infrared spectroscopy and optical pyrometry. The polymerizations of these monomers are typified by an extended induction period that has been attributed to the presence of a long‐lived tertiary oxonium ion intermediate formed by the reaction of the initially formed secondary oxonium ion with the cyclic ether monomer. Because the ...
Tópico(s): Carbon dioxide utilization in catalysis
2005 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
James V. Crivello, Umut Bulut,
Abstract Curcumin, a naturally occurring, intensely yellow dye extracted from the spice turmeric, is an efficient photosensitizer for diaryliodonium salt photoinitiators at wavelengths ranging from 340 to 535 nm. With curcumin as a photosensitizer, it is possible to carry out the cationic photopolymerization of a wide variety of epoxide, oxetane, and vinyl monomers with long‐wavelength UV and visible light. An example of the photopolymerization of an epoxide monomer with ambient solar irradiation ...
Tópico(s): Dyeing and Modifying Textile Fibers
2005 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
Umut Bulut, James V. Crivello,
An investigation of the photoinitiated cationic ring-opening polymerizations of various epoxy monomers was conducted using real-time infrared spectroscopy and optical pyrometry. Several types of behavior were observed and interpreted on the basis of the relative stabilities of the secondary and tertiary oxonium ion intermediates that are generated during the ring-opening polymerization of these monomers. Based on the mechanistic interpretations proposed, attempts were made to accelerate the photopolymerizations ...
Tópico(s): Dental materials and restorations
2005 - American Chemical Society | Macromolecules
Dual polymer electrochromic devices (ECDs) composed of electrochemically deposited conducting copolymers of thiophene-functionalized monomers, 2-[(3-thienylcarbonyl)oxy] ethyl 3-thiophene carboxylate (TOET), 2,3-bis-[(3-thienylcarbonyl)oxy]propyl 3-thiophene carboxylate (TOPT), and 3-[(3-thienylcarbonyl)oxy]-2,2-bis-[(3-thienylcarbonyl)oxy]propyl 3-thiophene carboxylate (TOTPT), and polyethylene dioxythiophene (PEDOT) as the counter part were constructed with tetrabutylammonium tetrafluoroborate (TBAFB) ...
Tópico(s): Analytical Chemistry and Sensors
2004 - Elsevier BV | Synthetic Metals
Umut Bulut, Faruk Yılmaz, Yusuf Yağcı, Levent Toppare,
Tópico(s): Transition Metal Oxide Nanomaterials
2004 - Elsevier BV | Reactive and Functional Polymers
Umut Bulut, Abidin Balan, Cagin Caliskan,
Abstract Two benzotriazole derivative dyes 4,7‐bis(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)‐2‐dodecyl‐2 H ‐benzo[1,2,3]triazole, and 2‐dodecyl‐4,7‐bis(4‐hexylthiophen‐2‐yl)‐2 H ‐benzo[ d ][1,2,3]triazole are shown to work as efficient photosensitizers for a diphenyliodonium salt initiator in cationic photopolymerization of epoxide and vinyl monomers. Substituted thienyl groups are attached to benzotriazole backbone to extend conjugation and enhance electron density of the molecules. Thereby, it was ...
Tópico(s): Click Chemistry and Applications
2010 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
Gulsah Bor, Umut Bulut, Ezgi Man, Simge Balaban Hanoglu, Serap Evran, Suna Tımur,
An aptamer-based electrochemical biosensor was designed and fabricated for methamphetamine (METH) analysis. Several aptamer sequences developed by the GO-SELEX method were immobilized onto gold electrodes (GE) via gold-thiol affinity. Surface characterizations were performed by electrochemical methods including cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectrometry (EIS). GE/Apta-4/METH aptasensor was selected for further studies since the best results ...
Tópico(s): Biosensors and Analytical Detection
2022 - Elsevier BV | Journal of Electroanalytical Chemistry
Umut Bulut, Merve Kolay, Simge Tarkuç, Levent Toppare,
Abstract The use of two dibenzo[a,c]phenazine derivatives, 10,13‐bis(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)dibenzo[a,c]phenazine and 10,13‐bis(4‐hexylthiophen‐2‐yl)dibenzo[a,c]phenazine are reported as photosensitizers for diaryliodonium salt photoinitiators. Novel dyes based on the dibenzo[a,c]phenazine skeleton are shown to be efficient in carrying out the cationic photopolymerizations. Representative examples of different types of monomers including epoxide, and vinyl monomers are polymerized ...
Tópico(s): Oxidative Organic Chemistry Reactions
2011 - Wiley | Journal of Polymer Science Part A Polymer Chemistry
Umut Bulut, Levent Toppare, Faruk Yılmaz, Yusuf Yağcı,
2,3-bis-[(3-thienylcarbonyl)oxy]propyl 3-thiophene carboxylate (TOPT) was synthesized via the reaction of 3-thionylcarboxylic acid with glycerol, and electrochemically polymerized either with thiophene and pyrrole by using tetrabutylammonium tetrafluoroborate (TBAFB) as the supporting electrolyte in acetonitrile (AN). Characterization of the resulting copolymers was performed via cyclic voltammetry, FTIR, thermal gravimetry analysis (TGA), and scanning electron microscopy (SEM). Electrical conductivities ...
Tópico(s): Analytical Chemistry and Sensors
2004 - Elsevier BV | European Polymer Journal
Zekeriya Öztemür, Okay Bulut, Murat Korkmaz, Umut Hatay Gölge, Hayati Öztürk, Gündüz Tezeren, İlhan Günaydın,
Tópico(s): Orthopedic Surgery and Rehabilitation
2012 - Springer Science+Business Media | Rheumatology International
Sertaç Yılmaz, Umut D. Özugˇurel, Karahan Bulut, Mehmet Nacı Incı,
Vibration amplitude measurement with a single frame using a structured light pattern of a four-core optical fibre is demonstrated both theoretically and experimentally for the first time. The structured light pattern of the four-core optical fibre consists of vertical and horizontal interference fringes. Using a digital CCD camera and the Fourier Transform analysis, such a light pattern is employed to study amplitude information of a vibrating object. Since the structured light pattern contains ...
Tópico(s): Advanced Measurement and Detection Methods
2005 - Elsevier BV | Optics Communications
Murat Yiğit, Barbaros Çelıkkol, Sevdan Yılmaz, Musa Bulut, Hasan Özalp, Robert Dwyer, Masashi Maita, Bayram Kızılkaya, Ümüt Yiğit, Sebahattin Ergün, Kaan Gürses, Yeşim Büyükateş,
Concentrations of trace metals were determined in the muscle tissue, digestive gland and gills of Mediterranean mussels (Mytilus galloprovincialis) collected from different locations around an offshore copper alloy fish farm. Levels of copper (Cu), zinc (Zn), manganese (Mn) and iron (Fe) as mg/kg wet weight in the edible part of the mussels collected from distant zone (upstream Zn7.33 > Fe2.8 > Cu0.13 > Mn0.07 and downstream Zn9.9 > Fe5.67 > Cu0.18 > Mn0.17) were significantly lower (p < 0.05) than those sampled from ...
Tópico(s): Trace Elements in Health
2017 - Taylor & Francis | Human and Ecological Risk Assessment An International Journal
Umut Bulut, Şevki Can Cevher, Vuslat Öykü Sayın, Sevgi Sarıgül Özbek, Nevra Altın, Ali Çırpan, Saniye Söylemez,
Abstract Diabetes is an important public health problem all over the world that affects the quality of life, and its late diagnosis leads to serious complications such as stroke, blindness, limb amputations, and kidney failure. Fabrication of economical and user‐friendly biosensor systems allows the rapid and early detection of prediabetes and type 2 diabetes. Accordingly, a novel, amino‐functionalized, conjugated, alternating polymer was synthesized, characterized, and coated on a glassy carbon ...
Tópico(s): Analytical Chemistry and Sensors
2024 - Wiley | Electroanalysis
Selay Tornacı, Merve Erginer, Umut Bulut, Beste Sener, Elifsu Persilioglu, İsmail Bergutay Kalaycılar, Emine Guler, Hasret Yardibi, Pınar Si̇yah, Oguzhan Karakurt, Ali Çırpan, Barış Gökalsın, Ahmet Murat Şenışık, Fırat Barış Barlas,
Abstract Cancer is anticipated to become the pioneer reason of disease‐related deaths worldwide in the next two decades, underscoring the urgent need for personalized and adaptive treatment strategies. These strategies are crucial due to the high variability in drug efficacy and the tendency of cancer cells to develop resistance. This study investigates the potential of theranostic nanotechnology using three innovative fluorescent polymers (FP‐1, FP‐2, and FP‐3) encapsulated in niosomal carriers, ...
Tópico(s): Nanoparticle-Based Drug Delivery
2024 - Wiley | Macromolecular Bioscience
Umut Bulut, Vuslat Öykü Sayın, Şevki Can Cevher, Ali Çırpan, Saniye Söylemez,
An amino-functionalized, conjugated polymer (P(BDBT)) modified glassy carbon electrode (GCE) was employed as an immobilization platform for glucose oxidase (GOx) enzyme to assemble a novel glucose biosensor.Amino groups available on the polymer backbone served as bioconjugation sites for GOx via glutaraldehyde (GA).The biosensor response to the reduction in oxygen amount because of the enzyme reaction was monitored at -0.7 V potential versus Ag/AgCl.The biosensor displayed a broad linear range between ...
Tópico(s): Analytical Chemistry and Sensors
2022 - Budapest University of Technology and Economics | eXPRESS Polymer Letters
Çalışmada çağrı merkezi faaliyetlerinde etkinlik ve verimliliğin ana belirleyicileri olan çalışanların performanslarını etkileyen bazı faktörlerin incelenmesi hedeflenmiştir.Deneyim, iş yükü ve çalışma süresi gibi değişkenlerinin performans üzerindeki etkileri incelendiğinde performans ile çalışan deneyimi arasında aynı yönlü bir ilişki bulunmuşken, performans ile iş yükü ve çalışma süreleri arasında ters yönlü bir ilişki olduğunu saptanmıştır
Tópico(s): Public Administration and Governance
2017 - Isarder | Journal of Business Research - Turk
Umut Bulut, Seda Yilmaz, Başak Yiğitsoy, Levent Toppare,
Two benzotriazole derivatives, 2-benzyl-4,7-di(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole (BBTS) and 2-benzyl-4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2H-benzo[d] [1,2,3]triazole (BBTES) were employed as photosensitizers for diaryliodonium salt photoinitiators in photoinitiated cationic polymerization of various epoxide and vinyl ether monomers. Diphenyliodonium hexafluorophosphate (Ph2I+PF6 –) salt was used as the photoinitiator in this study. Extended conjugation and electron-rich moieties of ...
Tópico(s): Oxidative Organic Chemistry Reactions
2012 - Taylor & Francis | Journal of Macromolecular Science Part A
Umut Bulut, Selmiye Alkan Gürsel, Faruk Yılmaz, Yusuf Yağcı, Levent Toppare,
Abstract 2‐[(3‐Thienylcarbonyl)oxy]ethyl 3‐thiophene carboxylate (TOET) was synthesized via the reaction of 3‐thionylcarboxylic acid with ethylene glycol, and electrochemically polymerized with thiophene (Th) and pyrrole (Py) by using tetrabutylammonium tetrafluoroborate (TBAFB) as the supporting electrolyte in acetonitrile (ACN). Characterization of the resulting copolymers were performed via cyclic voltammetry, FTIR, and scanning electron microscopy (SEM). Electrical conductivities are measured by the ...
Tópico(s): Organic Electronics and Photovoltaics
2004 - Taylor & Francis | Journal of Macromolecular Science Part A
Taha Yusuf Kuzan, Kübra Murzoğlu Altıntoprak, Hatice Özge Çiftçi, Umut Ergul, N Ozdemir, Muhammet Bulut, Nurettin Yigit,
T he coronavirus disease 2019 caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) first appeared in Wuhan, China in December 2019, spread to the whole world in a short time, and was declared as a pandemic by the World Health Organization (WHO) on March 11, 2020.According to the WHO data, as of April 11, 2020, the number of confirmed COVID-19 cases has exceeded 1.5 million and the total loss of life caused by the virus has exceeded 100 000, worldwide.In Turkey, in the last one ...
Tópico(s): Ultrasound in Clinical Applications
2020 - | Diagnostic and Interventional Radiology
Uğur Lök, Umut Gülaçtı, Burcu Ekmekçi, Taner Bulut, Murat Çeli̇k,
To investigate any possible effects of mean platelet volume (MPV) on short-term stroke prognosis and functional outcome in patients with first-ever acute ischemic stroke (FEAIS).This retrospective cross-sectional study included 798 FEAIS patients admitted to the emergency department of a tertiary care hospital in Adiyaman, Turkey between January 2013 and June 2015. The data were evaluated according to whether alive or dead, MPV levels, modified Rankin scale (MRS) scores, National Institutes of Health ...
Tópico(s): Cardiovascular Health and Disease Prevention
2017 - Riyadh Military Hospital | Neurosciences
Mehmet Yekta Öncel, İlke Mungan Akın, Mehmet Kenan Kanburoğlu, Cüneyt Tayman, Şenay Coşkun, Fatma Narter, İlkay Er, Tinatin Gelenava Oncan, Aslı Memişoğlu, Merih Çetınkaya, Demet Oğuz, Ömer Erdeve, Esin Koç, Turan Derme, Dilek Şahın, Bülent Güzel, Arzu Bilge Tekin, Yasemin Akın, Ahmet Kale, Hüseyin Aktürk, Mehmet Özsürmeli, Nazife Reyyan Gök, Rabia Merve Palalıoğlu, Abdurrahman Hamdi İnan, Hülya Özdemir, Esra Eşim Büyükbayrak, İbrahim Polat, Gülser Bingöl Dikdere, Leyla Bilgin, Tuğba Saraç Sivrikoz, İbrahim Caner, Hilal Uslu Yuvacı, Nursu Kara, Ali Galip Zebitay, Emel Okulu, Erkan Kalafat, Nurdan Uraş, Bülent Tekin, Nükhet Aladağ Çiftdemir, Muhammet Bulut, Ali Bülbül, Nilüfer Okur, Ferda Özlü, Kadir Şerafettin Tekgündüz, Adil Umut Zübarioğlu, Hüseyin Altunhan, Baran Cengiz Arcagök, Canan Aygün, Nihat Demir, İsmail Kürşat Gökçe, Nazlı Dilay Gültekin, Handan Hakyemez Toptan, Ferit Kulalı, Sinan Tüfekçi, Funda Tüzün, Akan Yaman, Hüseyin Üstün,
Limited data are available on pregnant women with COVID-19 and their neonates. We aimed to evaluate the epidemiological and clinical characteristics of newborns born to women infected with COVID-19. A multicenter cohort study was conducted among newborns born to mothers with COVID-19 in 34 neonatal intensive care units (NICUs) in Turkey. Pregnant women (n = 125) who had a positive RT-PCR test and their newborns were enrolled. Cesarean section, prematurity, and low-birthweight infant rates were 71.2%, ...
Tópico(s): Maternal and fetal healthcare
2020 - Springer Science+Business Media | European Journal of Pediatrics