Browsing by Author "Kaya İ."

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    Fluorescence, thermal and electrochemical properties of poly(azomethine-urethane)s containing sulfone group
    (Springer Verlag, 2015) Avcı A.; Temizkan K.; Kaya İ.
    In this study, the new sulfone group-containing poly(azomethine-urethane)s (PAZUs) were synthesized to investigate the effects various diisocyanates on the thermal, fluorescence, electrochemical and morphological properties. The structures of PAZUs have been confirmed by FT-IR, NMR, and SEC analyses. The electrochemical behaviors of the PAZUs were examined by cyclic voltammetry. Optical properties were investigated by UV–Vis and fluorescence measurements. The PAZUs were further characterized by TGA, DSC, SEM, and AFM techniques. TGA analyses results showed considerable increase in the thermal stability of polyurethanes due to the introduction of azomethine bond in the main chain. Consequently, because of the fine thermal properties the obtained materials can be used to produce thermally stable materials. © 2015, Springer-Verlag Berlin Heidelberg.
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    Photophysical and thermal properties of polyazomethines containing various flexible units
    (Polymer Society of Korea, 2017) Kaya İ.; Avcı A.; Temizkan K.
    In this study, the poly(azomethine-ether-urethane), poly(azomethine-ester) and poly(azomethine-epoxyether) compounds were prepared to investigate effect of various flexible units on some physical properties like thermal stability and photophysical properties. Structural characterizations were made by FTIR, 1H NMR, 13C NMR, and UV-Vis analyses. The molecular weight distributions of polymers were performed by gel permeation chromatography (GPC) measurement. The chemical and physical properties of polymers were examined by thermogravimetry (TG), differential scanning calorimetry (DSC), photoluminescence (PL), dynamic mechanical analysis (DMA), scanning electron microscope (SEM) and atomic force microscopy (AFM) techniques. As a result, the outstanding properties related to the photoluminescence and thermal measurements of the polymers were obtained. Therefore, the presented photoluminescent polymers could be used in thermally stable photo-functional materials. [Figure not available: see fulltext.] © 2016, The Polymer Society of Korea and Springer Sciene+Business Media Dordrecht.
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    Conducting polymer composites based on LDPE doped with poly(aminonaphthol sulfonic acid)
    (Elsevier B.V., 2018) Doğan F.; Şirin K.; Kolcu F.; Kaya İ.
    The paper presents the mechanical, morphological, thermal and the electrostatic charge dissipative (ESD) properties of binary blends of low-density poly (ethylene) (LDPE) blended with poly (1-amino-2-hydroxy naphthalene-4-sulfonic acid) (PANSA). Blends were prepared by loading 0.5, 1.0 and 3 wt% of PANSA into LDPE matrix in the twin-screw micro extruder. The interaction between PANSA and LDPE was then characterized by FT-IR, DSC, TG, DMA, AFM, SEM and X-RD techniques. The resulting polyolefin-based blends were also investigated by stress-strain curves in order to analyze some physico-mechanical properties. Percentages of the crystallinity of the blends were calculated by FT-IR, DSC and X-RD analyses. The conductivity of PANSA/LDPE blends was determined to be in the range of 10−11- 10−12 S cm−1 using ESD applications. The antistatic decay time of blend films was found to be of the order of 0.103–1.721 secat corona voltages between −3 kV and 3 kV, concluding that PANSA can be used as an effective ESD material for antistatic coatings of LDPE. © 2018 Elsevier B.V.
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    What we learned about COVID-19 so far? Notes from underground
    (AVES, 2020) Akyıl F.T.; Karadoğan D.; Gürkan C.G.; Yüksel A.; Arıkan H.; Eyüboğlu T.Ş.; Emiralioğlu N.; Gürsoy T.R.; Şerifoğlu İ.; Töreyin Z.N.; Marim F.; Kara B.Y.; Özakıncı H.; Develi E.; Çakmakçı S.; Küsbeci T.Ç.; Karcıoğlu O.; Gülhan P.Y.; Erçelik M.; Er B.; Ataoğlu Ö.; Polat D.; Kaya İ.; Önyılmaz T.A.; Aydın A.; Kızılırmak D.; Er A.B.; Kılınç M.; Günaydın F.E.; Gürz S.; Karaoğlanoğlu S.; Çelik S.; Esendağlı D.; Toptay H.; Sertçelik Ü.Ö.; Akgün M.
    The novel coronavirus pandemic poses a major global threat to public health. Our knowledge concerning every aspect of COVID-19 is evolving rapidly, given the increasing data from all over the world. In this narrative review, the Turkish Thoracic Society Early Career Taskforce members aimed to provide a summary on recent literature regarding epidemiology, clinical findings, diagnosis, treatment, prevention, and control of COVID-19. Studies revealed that the genetic sequence of the novel coronavirus showed significant identity to SARS-CoV and MERS-CoV. Angiotensin-converting enzyme 2 receptor is an important target of the SARS-CoV-2 while entering an organism. Smokers were more likely to develop the disease and have a higher risk for ICU admission. The mean incubation period was 6.4 days, whereas asymptomatic transmission was reported up to 25 days after infection. Fever and cough were the most common symptoms, and cardiovascular diseases and hypertension were reported to be the most common comorbidities among patients. Clinical manifestations range from asymptomatic and mild disease to severe acute respiratory distress syndrome. Several patients showed typical symptoms and radiological changes with negative RT-PCR but positive IgG and IgM antibodies. Although radiological findings may vary, bilateral, peripherally distributed, ground-glass opacities were typical of COVID-19. Poor prognosis was associated with older age, higher Sequential Organ Failure Assessment score, and high D-dimer level. Chloroquine was found to be effective in reducing viral replication in vitro. Likewise, protease inhibitors, including lopinavir/ritonavir, favipiravir, and nucleoside analogue remdesivir were proposed to be the potential drug candidates in COVID-19 management. Despite these efforts, we still have much to learn regarding the transmission, treatment, and prevention of COVID-19. © 2020 by Turkish Thoracic Society.
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    Lung cancer from suspicion to treatment: An indicator of healthcare access in Turkey
    (Elsevier Ltd, 2023) Kızılırmak D.; Yılmaz Kaya Z.; Gökçimen G.; Havlucu Y.; Cengiz Özyurt B.; Gündoğuş B.; Esendağlı D.; Serez Kaya B.; Yılmam İ.; Aydemir Y.; Çolak M.; Afşin E.; Çetin N.; İdikut A.; Değirmenci C.; Oral Tapan Ö.; Gündüz Gürkan C.; Kocatürk C.İ.; Ömeroğlu Şimşek G.; Kalafat C.E.; Özgün Niksarlıoğlu E.Y.; Ergün Serdaroğlu M.; Karcıoğlu O.; Özyurt S.; Karahacıoğlu Madran E.; Yaprak Bayrak B.; Alasgarova Z.; Baydar Toprak O.; Yılmazel Uçar E.; Topal B.N.; Argun Barış S.; Guliyev E.; Güzel E.; Küçük S.; Ocaklı B.; Baran Ketencioğlu B.; Selçuk N.T.; Sarı Akyüz M.; Sercan Özgür E.; Yetkin N.A.; Çetinkaya P.D.; Deniz P.P.; Atlı S.; Çetindoğan H.; Karakaş F.G.; Yılmaz E.S.; Ergün D.; Ergün R.; Tulay C.M.; Ünsal M.; Demirkaya İ.; Marım F.; Kaya İ.; Demirdöğen E.; Görek Dilektaşlı A.; Ursavaş A.; Çelik P.
    Background: Lung cancer is the leading cause of cancer-related deaths worldwide. Before beginning lung cancer treatment, it is necessary to complete procedures such as suspecting lung cancer, obtaining a pathologic diagnosis, and staging. This study aimed to investigate the processes from suspicion of lung cancer to diagnosis, staging, and treatment initiation. Methods: The study was designed as a multicenter and cross-sectional study. Patients with lung cancer from various health institutions located in all geographic regions of Turkey were included in the study. The sociodemographic and clinical characteristics of the patients, the characteristics of the health institutions and geographic regions, and other variables of the lung cancer process were recorded. The time from suspicion of lung cancer to pathologic diagnosis, radiologic staging, and treatment initiation, as well as influencing factors, were investigated. Results: The study included 1410 patients from 29 different medical centers. The mean time from the initial suspicion of lung cancer to the pathologic diagnosis was 48.0 ± 52.6 days, 39.0 ± 52.7 days for radiologic staging, and 74.9 ± 65.5 days for treatment initiation. The residential areas with the most suspected lung cancer cases were highly developed socioeconomic zones. Primary healthcare services accounted for only 0.4% of patients with suspected lung cancer. The time to pathologic diagnosis was longer in the Marmara region, and the wait time for staging and treatment initiation was longer in Eastern and Southeastern Anatolia. Patients who presented to chest disease referral hospitals with peripheral lesions, those with early-stage disease, and those who were diagnosed surgically had significantly longer wait times. Conclusion: The time between pathologic diagnosis, staging, and treatment initiation in lung cancer was longer than expected. Increasing the role of primary healthcare services and distributing socioeconomic resources more equally will contribute to shortening the time to diagnosis and improve treatment processes for lung cancer. © 2023 Elsevier Ltd