83 results on '"Ceylan R"'
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2. Novel perspectives on two Digitalis species: Phenolic profile, bioactivity, enzyme inhibition, and toxicological evaluation
- Author
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Katanić, J., Ceylan, R., Matić, S., Boroja, T., Zengin, G., Aktumsek, A., Mihailović, V., and Stanić, S.
- Published
- 2017
- Full Text
- View/download PDF
3. Conclusions of cooperative and noncooperative interaction between monetary and fiscal policies in small scale open economy
- Author
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Tetik M., Ceylan R., Ulucan H., and Bari B.
- Subjects
New Keynesian model ,Cooperative equilibrium ,Dynamic stochastic equilibrium model ,Game theory ,Nash solution - Abstract
Interactions between the monetary and fiscal policy are analyzed in a game-theoretical framework on the base of the new-Keynesian model. The interactions between policymakers are modeled by using a dynamic stochastic equilibrium model (DSGE) for a small-scale open economy. From this point of view, the interactions between policymakers are evaluated in two different hypothetical scenarios. Optimal policy rules for a small-scale open economy are derived by using Nash Solution (a non-cooperative solution) and cooperative equilibrium. The performances of the derived policy rules are evaluated by comparing counter-factual experiments via dynamic simulation. The model parameters are calibrated for the Turkish economy. Then, the policy mix providing the minimum social loss is obtained. The main finding of dynamic simulations is that cooperative interaction shows better performance in the Turkish economy than non-cooperative interaction. © Peter Lang GmbH Internationaler Verlag der Wissenschaften Berlin 2020. All rights reserved.
- Published
- 2021
4. Packed Water Consumption Preferences Of Urban Residents And Factors Affecting Bottled Water Market: An Example From Turkey
- Author
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Akpinar, Metin Goksel, Gul, Mevlut, Ceylan, R. Figen, and Atalay-Oral, Mukerrem
- Abstract
Since 1990s, packed water demand is rising and is preferred instead of tap water by the consumers in the world. Modern marketing requires understanding and identifying consumer needs and to meet these needs with a higher level of satisfaction than the competitor. Public and private companies have been operating in the water market and the sector demonstrates a rapid development in Turkey as well as in the world. Accordingly, the determination and marketing of consumer-oriented products is important. This study is focused on the plastic carboy bottled water - demijohn (19 litres) sector which constitutes an important segment of the packed water market. In this context, a field survey was conducted in the Mediterranean region of Turkey to determine optimum product patterns providing the highest benefit to the demijohn packed water consumers. Conjoint analysis was to determine the optimum product set. Price, origin of the water, HACCP certification, production mode of water (natural or mineral water) and taste (soft or hard) were found out as affecting factors that maximize consumer benefits in demijohn packed water preferences respectively. The recent findings of the surveys conducted in the world demonstrated significance of price sensitivity of consumers and quality expectations from packed water as well. This similarity indicated that the marketing strategies of the market and demijohn segment should focus on cost reduction and product differentiation with regards to taste and meeting quality standards. Product differentiation should consider local brand development or improvement of existing brands.
- Published
- 2019
5. and tourism: Case of Turkey and silk road countries
- Author
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Caliskan, U, Saltik, IA, Ceylan, R, and Bahar, O
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analysis ,Tourism ,International trade ,Turkey ,Silk road ,Panel cointegration - Abstract
Tourism development has been examined from various aspects and studies examining relations between tourism and other sectors are increasing. This study tests the relationship between the incoming tourists and volumes of import and export of Turkey and 13 Silk Road countries, through Panel ARDL. The study is important since it is thought to be the first to check the relation between tourist flows and trade amongst the Silk Road countries. Findings point out that even though there are differences in short-term and long-term relations, tourist flows and international trade are related, which indicates that international trade is important for tourism development. C1 [Caliskan, Ugur; Saltik, Isil Arikan; Bahar, Ozan] Mugla Sitki Kocman Univ, Fac Tourism, Kotekli, Mugla, Turkey. [Ceylan, Resat] Pamukkale Univ, Dept Econ, Denizli, Turkey.
- Published
- 2019
6. rate changes on stock returns in Turkey
- Author
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Tiryaki, A, Ceylan, R, and Erdogan, L
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Monetary policy ,economic activity ,non-linear ARDL ,stock returns - Abstract
The aim of this article is twofold: First, it examines the asymmetric effects of industrial production, money supply and RER on stock returns in Turkey by using the non-linear autoregressive distributed lag (NARDL) model over the periods of 1994:01-2017:05 and 2002:01-2017:05. Second, it tries to determine whether there is a change of these macroeconomic variables' effects on stock returns after the 2001 financial crisis since after 2002 period represents a structural break from the past in terms of economic, political and macroeconomic policy approaches. The study finds that the effects of the changes in industrial production, money supply and RER on stock returns are asymmetric, and the asymmetries are larger after the 2002 subsample compared to the full sample period. The empirical results further suggest that tight monetary policies appear to retard the stock returns more than easy monetary policies that stimulate them. C1 [Tiryaki, Ahmet] Anadolu Univ, Open Educ Fac, Econ, Yunus Emre Campus, TR-26470 Eskisehir, Turkey. [Ceylan, Resat] Pamukkale Univ, Dept Econ, Fac Econ & Adm Sci, Denizli, Turkey. [Erdogan, Levent] Anadolu Univ, Dept Econ, Fac Econ & Adm Sci, Eskisehir, Turkey.
- Published
- 2019
7. Antioxidant Potential and Inhibition of Key Enzymes Linked to Alzheimer’s Diseases and Diabetes Mellitus by Monoterpene-Rich Essential Oil from Sideritis galatica Bornm. Endemic to Turkey
- Author
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Zengin, G., Cengiz Sarikurkcu, Aktümsek, A., Ceylan, R., and Selçuk Üniversitesi
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lcsh:Chemistry ,lcsh:QD241-441 ,lcsh:QD1-999 ,lcsh:Organic chemistry ,lcsh:Botany ,Monoterpenes ,Cholinesterase ,Sideritis galatica ,Antioxidants ,Anti-diabetic ,lcsh:QK1-989 - Abstract
WOS: 000372802000008, The present study was designated to (1) characterize the essential oil from S. galatica (SGEOs) and (2) evaluate its antioxidant and enzyme inhibitory activities. Antioxidant capacity was tested different methods including free radical scavenging (DPPH, ABTS and NO), reducing power (FRAP and CUPRAC), metal chelating and phosphomolybdenum. Inhibitory activities were analyzed on acetylcholiesterase, butrylcholinesterase, alpha-amylase and alpha-glucosidase. SGEOs were chemically analyzed and identified by gas chromatography and gas chromatography/mass spectrophotometry. 23 components, representing 98.1% of SGEOs were identified. Monoterpene hydrocarbons (74.1%), especially alpha-(23.0%) and beta-pinene (32.2%), were the main constituents in SGEOs. The main sesquiterpene hydrocarbons were beta-caryophyllene (16.9%), germacrene-D (1.2%) and caryophyllene oxide (1.2%), respectively. Generally, SGEOs has shown moderate free radical, reducing power, metal chelating and enzyme inhibitory activities. These activities related to chemical profile in SGEOs. Our findings supported that the possible utility of SGEOs is a source of natural agents for food or pharmaceutical industries.
- Published
- 2016
8. Pet Bottled Water Market: Consumer Response From Turkey
- Author
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Akpinar, M. Goksel, Gul, Mevlut, and Ceylan, R. Figen
- Abstract
The purpose of the research study was to state varying preferences of PET bottled water consumption and to find the most appropriate product mix in Turkey referring to a field research conducted in the Mediterranean Region of Turkey. The data retrieved from 965 PET bottled water consumers via face to face survey was analysed by utilisation of conjoint analysis, which is based on the theory of total utility and described as a function of price and quality benefits (Ness 2002). The correspondents had valued lowest price, existence of food safety (HACCP) certification and production modes being natural spring water, having soft taste and existence of process quality (ISO) certification in a consecutive order. Even though there seems to exist a negative perception on plastic package with rising environmental consciousness, consumers find bottled water more trustworthy than tap water in terms of quality and accept the high cost. The acceptance ratio differs among countries due to income level and access to water. It was considered as essential to watch over the market challenges departing from these findings and whether the market referred to the preferences of consumers efficiently. Yet, the challenges occurred within 2010s were compared with the findings of this research in order to set forward a sound marketing strategy for rapidly developing PET bottled water market. It was understood that price and income sensitivity of consumers for bottled water market maintain their validity.
- Published
- 2018
9. Turkish Economy
- Author
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Cevis, I, Ceylan, R, and Yayla, N
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Foreign Trade Channel ,Expectation Channel ,ARDL ,EU Debt Crisis ,Financial Fragility index ,Capital and Finance Channel - Abstract
In this study, examining the contagion channels of EU debt crisis to Turkey, a financial fragility index is composed for the period of 2004:Q1-2014:Q3 to represent the debt crises. The relationship between this index and capital and finance channel (IIP), foreign trade channel (TTV), expectations channel (CCI and RCI) was analyzed by ARDL (Bound Test) method. Findings illustrates that there is a long run relationship between financial fragility index, real sector confidence index, trade volume and international investment position and that direction of the causality is from financial fragility index to other variables. As a result, EU debt crisis affects Turkey from all three channels, but the expectations channel has a comparative advantage.
- Published
- 2018
10. From Non-Linear Unit Root Tests
- Author
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Ceylan, R, Uz, I, and Cevis, I
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Fragile five ,current account deficit ,intertemporal current account ,model ,KSS test ,AESTAR test - Abstract
The debate on the sustainability of current account deficit is one of the unresolved matters among economist for a long time. The main purpose of this study is to analyze the issue of sustainability of current account deficits for fragile five countries by using nonlinear alternative unit root tests. The findings obtained from KSS and AESTAR tests revealed that current account deficit is sustainable in countries except for Brazil. This result is important in that the central banks in the fragile five countries, except Brazil, do not face a restriction caused by current account deficit in inflation target regime.
- Published
- 2018
11. ANTEP FISTIĞI FİYATININ TÜRKİYE’DE ÜRETİCİ KARARLARI ÜZERİNE ETKİSİNİN ANALİZİ
- Author
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KARACAN, Erdal and CEYLAN, R. Figen
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Türkiye,Antep fıstığı,Fiyat,Arz Cevap,Hata Düzeltme - Abstract
Antep fıstığı özel iklim isteklerinden dolayı dünyada sadece belirli bölgelerde yetiştirilebilmektedir. Dünya’da Antep fıstığı üretiminde başta gelen ülke İran’dır. İran’ı A.B.D. ve Türkiye takip etmektedir. Türkiye’de Antep fıstığı üretimi çoğunlukla ülkenin Güneydoğu Anadolu Bölgesi’nde yapılmaktadır. Bu çalışmada dünyada Antep fıstığı üretim miktarı ve alanı bakımından Türkiye’nin payı, ülke ekonomisine olan katkısı, ihracat ithalat rakamları incelenmiştir. Bu kapsamda özellikle üreticinin eline geçen birim fiyatının zamana bağlı olarak üretim miktarını diğer fiyat dışı unsurlarla birlikte etkileyip etkilemediğinin değerlendirilmesi 1993-2014 yılları arası ikincil verilerden istifade edilerek yapılmıştır. İkincil veri analizinden elde edilen bulgulara göre, üretim miktarının dönemsel değişme gösterdiği Antep fıstığı üretimi, uzun ve kısa dönemde fiyat değişiminden miktar olarak düşük olmakla birlikte, pozitif yönlü etkilenmektedir. Buna göre, bu periyodisite özelliği göz önünde bulundurularak sağlanacak fiyat destekleri sektörün üretim ve ihracat avantajları kazanmasında etkili olacaktır.
- Published
- 2017
12. TAXATION IN AGRICULTURAL MARKETS ANTALYA GREENHOUSE PRODUCTION
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SAYIN, Cengiz, CEYLAN, R. Figen, MENCET YELBOGA, M. Nisa, OZALP, Meral, ILBASMIS, Eda, and SAV, Oya
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greenhouse,taxation,producer,socio-demographic,profitability,Antalya - Abstract
Taxation of agriculture has long been discussed with reference to response of production to the charges. As agriculture can only respond price factors with periodic delays, analyses focusing on the impact of taxation system are important. Due to the recent changes in taxation system of agriculture in Turkey, researchers conducted a field survey in 2016 among greenhouse and glasshouse producers of Antalya. With this study, it is aimed to portray the feedbacks received from 281 green/glasshouse producers in the centre, west and east ends of the city. The assessment of the producers with regards to the current taxation system and expectations awaited for higher productivity and efficiency of the sector were received in addition to calculation of farm level inefficiencies. The assessment of the farmers were demonstrated in relation with the profitability structures of the green/glasshouses. Due to the findings, 79 % of the farmers considered income tax level as higher than acceptable level, while this negative perception rose to 83 % for VAT. In conformity with these results, the overall tax levels were considered as high by 85 %. Finally, the linear relationship between inefficiency and perceptions on taxation for tax sensitive farmers was mostly negative as expected.
- Published
- 2017
13. TRADE and REVEALED COMPARATIVE ADVANTAGE MEASURES: A CASE of MAIN EXPORT CROPS od BENIN REPUBLIC
- Author
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ALIDOU, Mouinatou, CEYLAN, R. Figen, and ILBASMIS, Eda
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Agricultural Trade,Comparative Advantage,Revealed Competitiveness,Comparative Export Performance,Benin,Nigeria,Burkina Faso - Abstract
International trade is one of the key factors of macroeconomic prosperity for any country. It is generally recognized that trade is essential for growth and that growth is critical for poverty reduction. In many nations in Africa where agriculture constitutes the largest portion of the economy and agricultural commodities figure prominently among the goods traded, international agricultural trade has been a notable motor of development. Agricultural trade is a generator of income and welfare for the millions of people who are directly or indirectly involved in it. Comparative advantage, one of the most celebrated concept/theory of economics, has globally dominated the field of international trade especially agricultural trade not only in academics but also in economic/development policy circles. Benin is one of the developing Sub-Saharan countries, of which the economic welfare depends essentially on agricultural trade. Agriculture contributes around 35 % in the country’s GDP and 80 % in the income generated by exports. By analysing the secondary cashew and cotton exports data retrieved from 1964 to 2014, three indices are calculated: the Revealed Comparative Advantage (RCA), the Revealed Competitiveness (RC) and Comparative Export Performance (CEP). In doing so, this study aimed to analyse the competitiveness of Benin’s two main agricultural export commodities that are cotton and cashew. Accordingly, the position of Benin will be compared with its neighbour countries competitive markets in West Africa, where selected crops export play a huge role in their economy. Nigeria for cashew and Burkina-Faso for cotton will be selected for data analysing watching the last 50 years (1964-2014). The analysis is conducted respecting data availability of the competing countries. This comparison of Benin and its major partners would provide an assessment of export specialization of Benin as well.
- Published
- 2017
14. Factors Affecting Local Tomato Preference in Comprison with Imported Tomato in Benin Republic
- Author
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Alidou, Mouinatou, primary and Ceylan, R, additional
- Published
- 2018
- Full Text
- View/download PDF
15. Evaluation of the factors affecting water-saving attitudes of urban life on the verge of the next century: a case study of the Mediterranean region of Turkey
- Author
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Akpinar, M. Goksel, primary, Gul, Mevlut, primary, Ceylan, R. Figen, primary, and Gulcan, Sinem, primary
- Published
- 2018
- Full Text
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16. Das Vorurteil über Muslime
- Author
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Zick, Andreas, Antes, P, and Ceylan, R
- Published
- 2016
17. Impacts of national agricultural trade policies on food self-sufficiency: Case of selected products in Niger.
- Author
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YELBOĞA, M. Nisa MENCET, SAYIN, Cengiz, ABDOUL-AZIZE, Hamidou Taffa, and CEYLAN, R. Figen
- Subjects
AGRICULTURAL policy ,AGRICULTURAL marketing ,COMMERCIAL policy ,NATURAL resources ,SELF-reliant living ,COWPEA - Abstract
Copyright of Derim is the property of Bati Akdeniz Agricultural Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
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18. Die Aktualität der Religionssoziologie für die Erforschung neuer muslimischer Gemeinschaften
- Author
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Ceylan, Rauf, Sağlam, Coşkun, Ceylan, R ( Rauf ), Sağlam, C ( Coşkun ), Walthert, Rafael, Ceylan, Rauf, Sağlam, Coşkun, Ceylan, R ( Rauf ), Sağlam, C ( Coşkun ), and Walthert, Rafael
- Abstract
Community has been a topic of interest in sociology since the very beginnings, and religion specifically is often seen as inseparable from that form of social interaction. Concepts of secularization and socialization have moved the community topic into the background, but the persistence of religious communities even in modern societies is evident. Communities are thus moving into the area of focus for the sociology of religion. In this context, what's the contribution of the sociology of religion to the research of religious communities? That's is the topic oft he following paper applied to "newer Muslim communities".
- Published
- 2016
19. Countries in terms of Development Stages
- Author
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Ceylan, R, Mollavelioglu, MS, and Kanberoglu, Z
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Foreign Direct Investment ,Convergence Analysis ,Performance Index - Abstract
In this study, the countries / economies, according to the classification in terms of stages of development, the convergence behavior of foreign direct investment performance is analyzed. This study grounds on the Global Competitiveness Report 2012-2013 for classifying the development stages of countries/economies. In the aforementioned report, countries/economies are divided into three main groups according to their development stages. These groups are "factor-driven economies", "efficiency-driven economies" and "innovation-driven economies". Moreover, this number has climbed to five after adding two more groups including the economies between the first stage and the second stage and the economies between the second stage and the third stage. This analysis estimates the foreign direct investment performances of the countries in this classification and examines intra-group and inter-group convergence relations for the period of 1970-2012 by means of Asymmetric Exponential Smooth Transition Auto-Regressive (AESTAR) unit root test. The findings demonstrate that most countries display a significant convergence behavior towards the ensemble average and the ensemble averages converge towards each other.
- Published
- 2014
20. Lathyrus aureus and Lathyrus pratensis: characterization of phytochemical profiles by liquid chromatography-mass spectrometry, and evaluation of their enzyme inhibitory and antioxidant activities
- Author
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Llorent-Martínez, E. J., primary, Ortega-Barrales, P., additional, Zengin, G., additional, Uysal, S., additional, Ceylan, R., additional, Guler, G. O., additional, Mocan, A., additional, and Aktumsek, A., additional
- Published
- 2016
- Full Text
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21. Evaluation of oxidative status in patients with Fasciola hepatica infection
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Karsen, H., Sunnetcioglu, M., Ceylan, R., Bayraktar, M., Taskin, A., Aksoy, N., and Remzi Erten
- Subjects
fluids and secretions ,parasitic diseases ,Fasciola hepatica, total antioxidant capacity, total oxidative status, oxidative stress index ,digestive system diseases - Abstract
Background: F. hepatica infection is rare and mostly subclinical. Migration of juvenile forms of F. hepatica into the host’s liver is accompanied by an inflammatory reaction followed by fibrosis and cirrhosis. Objective: The aim of this study was to evaluate oxidative status by using a novel automated method in patients with Fasciola hepatica. Methods: Twenty two patients with a diagnosis of F. hepatica and 26 healthy volunteers were enrolled in the study. Their Total antioxidant capacity status (TAC), total oxidant status (TOS) and catalase were measured in them and oxidative stress index (OSI) was calculated. These measurements were also taken for the control group and the values were compared. Results: Plasma levels of total TOS and OSI were significantly increased in patients as compared with healthy controls (P0.05). Conclusion: Total oxidative status and OSI were increased and total antioxidative status capacity was decreased in patients with F. hepatica infeciton. A high oxidative stress occurs during F. hepatica infection, which may cause severe damage in both the liver.Keywords: Fasciola hepatica, total antioxidant capacity, total oxidative status, oxidative stress index
- Published
- 2011
22. Comparison of energy inputs in glasshouse double crop (fall and summer crops) tomato production
- Author
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Ozkan, Burhan, Ceylan, R. Figen, and Kizilay, Hatice
- Published
- 2011
- Full Text
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23. Energy inputs and crop yield relationships in greenhouse winter crop tomato production
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Ozkan, Burhan, Ceylan, R. Figen, and Kizilay, Hatice
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- 2011
- Full Text
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24. Urban water management network of household expectations.
- Author
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Akpinar, M. G., Gul, M., and Ceylan, R. F.
- Subjects
MUNICIPAL water supply ,WATER management ,DRINKING water ,WATER pollution ,WATER quality - Abstract
Access to clean potable water is a global issue while it is also one of the articles of human rights. The demand for water increases as the population rises and economic activities grow. However, the water pollution and declination in water levels in the dams due to global warming as well as the low quality of potable water brings up the issue of running water sufficiency and safety. This study measures consumer satisfaction level and expectations on potable city water quality and services based on the cross-sectional data collected from urban settings in the Mediterranean region of Turkey. The results suggest that 71.4% of households use city water as their potable water and define the quality of potable city water as average quality. While the survey findings indicate that the colour and turbidity qualities of accessed water were ranked quite high, conductivity, taste and odour of the water have received lower rankings of satisfaction within a five Likert-scale. Additionally, lack of pre-information on water cuts, insufficient maintenance and repair services and unsatisfactory responses to the consumer complaints were listed as the main problems encountered in city water services. Besides, quality improvement of potable water, water pricing and safety issues were found as the most important items. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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25. A new application area of ANN and ANFIS: determination of earthquake load reduction factor of prefabricated industrial buildings
- Author
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Ceylan, M., primary, Arslan, M. H., additional, Ceylan, R., additional, Kaltakci, M. Y., additional, and Ozbay, Y., additional
- Published
- 2008
- Full Text
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26. Classification of ECG arrhythmias using Type-2 Fuzzy Clustering Neural Network.
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Ceylan, R., Ozbay, Y., and Karlik, B.
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- 2009
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27. Artificial immune systems and ANN in PMR coding.
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Sahan, S., Ceylan, R., and Gunes, S.
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- 2004
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28. A new application area of ANN and ANFIS: determination of earthquake load reduction factor of prefabricated industrial buildings.
- Author
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Ceylan, M., Arslan, M.H., Ceylan, R., Kaltakci, M.Y., and Ozbay, Y.
- Subjects
EFFECT of earthquakes on buildings ,INDUSTRIAL buildings ,PREFABRICATED buildings ,WAREHOUSES ,ARTIFICIAL neural networks - Abstract
The earthquake load reduction factor, R, is one of the most important parameters in the design stage of a building. Significant damages and failures were experienced on prefabricated reinforced concrete structures during the last earthquakes in Turkey and the experts agreed that they resulted mainly from the incorrectly selected earthquake load reduction factor, R. In this study, an attempt was made to estimate the R coefficient for prefabricated industrial structures having a single storey, one and two bays, which are commonly constructed for manufacturing and warehouse operation with variable dimensions. According to the selected variable dimensions, 280 sample (140 samples for one bay (S-1) and 140 samples for two bays (S-2)) frames' load-displacement relations were computed using pushover analysis and the earthquake load reduction factor, R, was calculated for each frame. Then, formulated three-layered artificial neural network methods (ANNs) and adaptive neuro-fuzzy inference system (ANFIS) were trained by using 214 of the 280 sample frames. Then, the methods were tested with the other 66 sample frames. Accuracy rates were found to be about 94% and 96% for ANN and ANFIS, respectively. The use of ANN and ANFIS provided an alternative way for estimating the R and it also showed that ANFIS estimated R more successfully than ANN. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
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29. Association of depression in mothers of disabled children with the child's participation in integrated education.
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Ceylan R and Aral N
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- 2007
- Full Text
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30. Türkiye ve Rusya arasındaki hububat ve yaş meyve sebze ticaretinin karşılaştırmalı incelenmesi
- Author
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Özen, Hüseyin, Tarım Ekonomisi, Ceylan, R. Figen., and Fen Bilimleri Enstitüsü
- Abstract
Ticaret tüm piyasalarda olduğu gibi, tarım ürünleri piyasalarında da ihtiyaçların karşılanabilmesi için kaçınılmazdır. Bu çalışmada Türkiye'nin Rusya'ya gerçekleştirdiği yaş sebze meyve ihracatı ile Rusya'nın Türkiye'ye gerçekleştirdiği hububat ihracatı Keynesyen karşılaştırmalı üstünlükler yaklaşımından hareketle incelenmiştir. İki ülkenin ürün gruplarına göre ticaret dengeleri, ilgili ürünlerde sadece birbirleri ile ticareti yaptığı varsayımıyla, sıfır toplamlı oyun olarak kurgulanmıştır. Çalışmada 2016 – 2020 yılları arasındaki ikincil veriler kullanılmış ve dönemler arası istatistiksel interpolasyon yapılmıştır. Oyun sonucunda elde edilen mükemmel Nash dengesi denklemi model olarak kullanılarak, Türkiye ile Rusya arasındaki ticaret dengesi değerlendirilmiştir. Çalışmanın sonucunda Türkiye'nin, yaş sebze meyve ticareti bağlamında Rusya'ya üstün olduğu ve bir birim yaş sebze meyve ürününün ortalama 5 birim hububata eşit olduğu görülmüştür. Bu duruma sebep olarak Rusya'daki otonom yatırım değerlerinin Türkiye'ye göre yüksek düzeyi ve Türk Lirası'nın diğer para birimleri karşısında değer kaybetmesi gösterilebilir. Bu üstünlüğün artırılması ve sürdürülebilir olabilmesi için hububat ve yaş meyve sebze üretiminin artırılması, inovasyonla birlikte Ar – Ge çalışmalarına önem verilmesi ve üretimde mekanizasyonun yaygınlaştırılmasıyla iş gücünün azaltılması önemlidir.
- Published
- 2021
31. Korkuteli ilçesinde kültür mantarı yetiştiriciliğinde kar etkinliği
- Author
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Mülazımoğulları, Esra, Tarım Ekonomisi, Ceylan, R. Figen., and Fen Bilimleri Enstitüsü
- Abstract
Bu araştırmanın ana amacı kültür mantarı yetiştiriciliğinde kâr etkinliğinin değerlendirilmesi ve etkinsizliğe sebep olan faktörler ile bunların etki düzeylerinin belirlenmesidir. Çalışmada kâr etkinliği değerlendirmesi yapılması için üretim maliyetlerinin gelir ve kar üzerindeki etkisinin de belirlenmesi gerekmiştir. Bu nedenle, kültür mantarı yetiştiriciliğinde girdi çıktı ilişkisinin sayısal olarak ortaya konulması da araştırmanın amaçları arasında yer almaktadır. Buna göre, çalışma kapsamında mantar yetiştiriciliğinin sürdürülebilirliğine yönelik politika önerileri geliştirmek ve sürecin karlılığının artırılmasın katkı sağlayıcı çıktılar üretilmesi istenmiştir. Birleşmiş Milletler Gıda ve Tarım Örgütü (FAO) on yıllık verilere göre Türkiye'de yıllık ortalama 35.571 ton mantar üretilmektedir. Bu verilere göre, Türkiye dünya mantar üretiminde on altıncı sırada yer almaktadır. Türkiye İstatistik Kurumu (TÜİK) verilerine göre ise Türkiye'de 2020 yılında 55.455 ton kültür mantarı üretilmiştir. Aynı yıl Antalya ili Korkuteli ilçesinde 33.518 ton kültür mantarı üretilmiştir. Bu veriler, Korkuteli ilçesinin 2020 yılında Türkiye'nin toplam mantar arzının %60'ını tek başına karşıladığını göstermektedir. Türkiye'de Korkuteli ilçesi kültür mantarı yetiştiriciliğinin başkenti olarak kabul edilmektedir. Bu nedenle, üretim sürecinin kârlılığını değerlendirmek için Korkuteli ilçesinde gayeli örnekleme yöntemi ile seçilen 60 üretici ile yüz yüze anket çalışması yapılmıştır. Üreticilerin 2020 Ekim-Kasım döneminde üretime bağlı olarak değişken masrafları incelenmiştir. Üreticilerin ortalama birim brüt kârı 205,09 TL olarak hesaplanmıştır. Üreticilerin en fazla katlandığı bedelin sırasıyla kompost, değişken işçilik ve enerji maliyeti olduğu sonucuna ulaşılmıştır. Birim üretim alanına göre ortalama kompost maliyeti 175,45 TL'dir. Değişken işçilik maliyeti 41,05 TL, enerji maliyeti ise 20,95 TL olarak hesaplanmıştır. Araştırma kapsamında, işletmelerin ilgili maliyetlerinin brüt kâra etkisi olasılıklı kâr sınırı analizi yöntemi ile tahmin edilmiştir. Sonuç olarak ortalama birim brüt kâr etkinsizliği %44 olarak bulunmuştur. Üreticinin cinsiyeti, eğitim ve memnuniyet düzeyi ile hasat süresi ve Çiftçi Kayıt Sistemine (ÇKS) kayıtlılığı kâr etkinsizliğini azaltan faktörler olarak belirlenmiştir. Üreticilerin yaşı, atık kompostu bahçede kullanması ve mantar satışını aracı ile yapması ise etkinsizliği artıran unsurlar olarak tespit edilmiştir. Elde edilen bulgular doğrultusunda kültür mantarı yetiştiriciliğinde kâr etkinliğini artırmak için; ilçede kadın üreticilerin teşvik edilmesi, uygulamalı eğitim ve kursların sayısı ve kalitesinin artırılması, üreticilerin memnuniyet düzeylerini artıracak yöntemler geliştirilmesi ve ÇKS kayıtlılığın teşvik edilmesi önerilmiştir. Ayrıca atık kompost merkezi kurulması ve kapatılan üretici birliğinin yeniden açılmasının da kâr etkinsizliğini azaltabileceği sonucuna ulaşılmıştır.
- Published
- 2021
32. A Nanogel Formulation of Anti-VEGF Peptide for Ocular Neovascularization Treatment.
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Durak S, Sutova HE, Ceylan R, Aciksari A, Yetisgin AA, Onder Tokuc E, Kutlu O, Karabas VL, and Cetinel S
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- Humans, Animals, Particle Size, Biocompatible Materials chemistry, Biocompatible Materials pharmacology, Materials Testing, Cell Proliferation drug effects, Peptides chemistry, Peptides pharmacology, Peptides administration & dosage, Human Umbilical Vein Endothelial Cells, Angiogenesis Inhibitors chemistry, Angiogenesis Inhibitors pharmacology, Angiogenesis Inhibitors administration & dosage, Macular Degeneration drug therapy, Macular Degeneration pathology, Macular Degeneration metabolism, Polyethyleneimine chemistry, Mice, Cell Line, Vascular Endothelial Growth Factor A metabolism, Vascular Endothelial Growth Factor A chemistry, Nanogels chemistry
- Abstract
Age-related macular degeneration (AMD) is an eye disorder that can lead to visual impairment in elder patients, and current treatments include repeated injections of monoclonal antibody-based antivascular endothelial growth factor (anti-VEGF) agents. This study investigates the potential of a nanoformulation of a peptide anti-VEGF molecule for neovascular AMD. Anti-VEGF peptide HRHTKQRHTALH (HRH), which has high affinity to VEGF-Fc receptor, was used as the bioactive agent to control neovascularization of the retina. The nanoformulation consisting of hyaluronic acid nanogel was generated by incorporating divinyl sulfone and cholesterol to increase the stability and control the size of the nanodrug. The encapsulation efficacy of nanogel was 65%, and drug release was 34.72% at the end of 192 h. Obtained nanogels were efficiently internalized in 15 min by human umbilical vascular endothelial cells (HUVECs) and ARPE-19 cells, and results indicate that nanoformulation is not toxic to ARPE-19 cells, whereas it inhibits HUVEC proliferation owing to anti-VEGF peptide in the nanogel structure. In the coculture experiment in which retinal penetration was modeled, it was observed that the nanogel reached HUVECs and negatively affected their proliferation without disturbing the monolayer of ARPE-19 cells. In vivo experiments with chick chorioallantoic membrane revealed that nanogel formulation has higher antiangiogenesis activity compared to free HRH. Additionally, in an oxygen-induced retinopathy model, the excessive growth of blood vessels was notably suppressed in mice treated with HRH-loaded nanogel. This research indicates that nanogels formulated in this study are promising candidates as a topical treatment for AMD.
- Published
- 2024
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33. Sleep Quality and Its Predictors among Dyspnea, Fatigue and Exercise Capacity in Pulmonary Arterial Hypertension.
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Ceylan R, Demir R, Zeren M, Sinan UY, and Kucukoglu MS
- Abstract
Background: Poor sleep quality is an overlooked symptom in patients with pulmonary arterial hypertension (PAH), however it may significantly contribute to disease burden., Objectives: The aim of this study was to assess the sleep quality of patients with PAH and investigate its association with dyspnea, fatigue, and exercise capacity., Methods: Forty-five patients were included. Sleep quality of the patients was assessed by the Pittsburgh Sleep Quality Index (PSQI), dyspnea levels were assessed by the UCSD-Shortness of Breath Questionnaire (UCSD-SOBQ), Baseline Dyspnea Index (BDI), Modified Medical Research Council (MMRC) dyspnea scale and Modified Borg Dyspnea scale, fatigue levels were evaluated with the Fatigue Severity Scale and Borg Rating of Perceived Exertion, and functional exercise capacity was evaluated with the 6-minute walk test (6MWT)., Results: Among the patients with PAH, 64% had poor sleep quality (PSQI > 5). PSQI score was significantly correlated with MMRC scale (r = -0.561), UCSD-SOBQ (r = 0.497), BDI (r = -0.468), and 6MWT (r = -0.412) (p < 0.05). There was no significant relationship between sleep quality and fatigue. A regression model including MMRC and 6MWT could explain 32% of variance in PSQI (p < 0.05), and MMRC score was an independent predictor for PSQI (p < 0.05). In addition, MMRC score had a greater influence on PSQI than 6MWT (β = 0.548 vs. 0.019)., Conclusions: Poor sleep quality is common in patients with PAH and is associated with poor exercise capacity and dyspnea. Patients with severe dyspnea are particularly at higher risk of poor sleep quality. Consideration of sleep-related complaints and underlying mechanisms when planning symptomatic treatments for these patients may help provide better management for PAH., Competing Interests: All the authors declare no conflict of interest.
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- 2024
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34. Adrenal lesion classification with abdomen caps and the effect of ROI size.
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Solak A, Ceylan R, Bozkurt MA, Cebeci H, and Koplay M
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- Humans, Artificial Intelligence, Magnetic Resonance Imaging methods, Abdomen, Deep Learning, Radiology
- Abstract
Accurate classification of adrenal lesions on magnetic resonance (MR) images are very important for diagnosis and treatment planning. The detection and classification of lesions in medical imaging heavily rely on several key factors, including the specialist's level of experience, work intensity, and fatigue of the clinician. These factors are critical determinants of the accuracy and effectiveness of the diagnostic process, which in turn has a direct impact on patient health outcomes. With the spread of artificial intelligence, the use of computer-aided diagnosis (CAD) systems in disease diagnosis has also increased. In this study, adrenal lesion classification was performed using deep learning on MR images. The data set used was obtained from the Department of Radiology, Faculty of Medicine, Selcuk University, and all adrenal lesions were identified and reviewed in consensus by two radiologists experienced with abdominal MR. Studies were carried out on two different data sets created by T1- and T2-weighted MR images. The data set consisted of 112 benign and 10 malignant lesions for each mode. Experiments were performed with regions of interest (ROIs) of different sizes to increase the working performance. Thus, the effect of the selected ROI size on the classification performance was assessed. In addition, instead of the convolutional neural network (CNN) models used in deep learning, a unique classification model structure called Abdomen Caps was proposed. When the data sets used in classification studies are manually separated for training, validation, and testing, different results are obtained with different data sets for each stage. To eliminate this imbalance, tenfold cross-validation was used in this study. The best results obtained were 0.982, 0.999, 0.969, 0.983, 0.998, and 0.964 for accuracy, precision, recall, F1-score, area under the curve (AUC) score, and kappa score, respectively., (© 2023. Australasian College of Physical Scientists and Engineers in Medicine.)
- Published
- 2023
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35. Predicting preschool children's digital play addiction tendency during Covid-19 pandemic: Regarding the mother-child relationship, and child- and family-related factors.
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Emiroğlu İlvan T and Ceylan R
- Abstract
Previous research about children's digital play has predominantly focused on parental perspectives and parental mediation strategies. Although research on the effects of digital play on young children's development is plentiful, there is little evidence on young children's digital play addiction tendency. Herein, preschool children's digital play addiction tendency, and the mother-child relationship perceived by mothers, examining child- and family-related factors were explored. The present study also aimed to contribute to the current research pertaining to preschool-aged children's digital play addiction tendency through an examination of the mother-child relationship, and child- and family-related factors as potential predictors of children's digital play addiction tendency. A sample of 450 mothers of children between 4 and 6 years filled out two measures that identify the mother-child relationship and children's digital play addiction tendency. Correlational analyses revealed that in general, the mother-child relationship was significantly associated with children's digital play addiction tendency. Significant differences were evident in the relationship between numerous child- and family-related factors, and children's digital play addiction tendency, as well as the mother-child relationship. Hierarchical regression analyses indicated that a negative mother-child relationship, the children's digital play usage, and the mothers' digital device usage predicted the children's digital play addiction tendency., Competing Interests: Conflict of interestNone., (© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)
- Published
- 2023
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36. Alterations in Facial Soft Tissue Thickness Post-Facemask Treatment in Noncleft Skeletal Class III and Bilateral Cleft Lip Palate Class III Patients.
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Ulusoy Mutluol E, Koyuncu S, Ceylan R, and Akın M
- Abstract
Objective: The purpose of this retrospective study was to assess the alteration in the facial soft tissue thickness after rapid maxillary expansion with facemask treatment in bilateral cleft lip and palate (BCLP) Class III patients and noncleft Class III patients., Methods: Case records including lateral cephalograms of 30 patients (19 females, 11 males) treated using a rapid maxillary expansion with facemask treatment were analyzed. Group I (age: 11.4 ± 1.02 years) (10 females, 5 males) consisted of noncleft skeletal Class III patients, and group II (age: 10.8 ± 0.84 years) (9 females, 6 males) comprised skeletal Class III patients with bilateral cleft lip and palate. Fifteen hard tissue and 10 soft tissue measurements were made at the beginning and at the end of the treatment to evaluate the change with rapid maxillary expansion combined facemask treatment., Results: The bilateral cleft lip and palate group displayed a statistically significant increase in the thickness of the subnasale, labrale superius, labrale inferius, labiomentale, and pogonion, whereas the thickness of the stomion was found to be significantly decreased. The noncleft group demonstrated a statistically significant decrease in the thickness of the stomion and gnathion. There was a statistically significant difference between the bilateral cleft lip and palate and noncleft groups in the facial soft tissue thickness measurements at labrale superius, gnathion, and subnasale points and in Y axis, U1-SN, U1-NA in the hard tissue measurements., Conclusion: The results of the study indicated that the rapid maxillary expansion with facemask treatment produced diverse alterations in the facial soft tissue thickness of bilateral cleft lip and palate patients and noncleft Class III patients.
- Published
- 2022
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37. Chemical Composition, Antioxidant Activity, Cholinesterase Inhibitor and in Vitro Insecticidal Potentiality of Essential Oils of Lippia multiflora Moldenke and Eucalyptus globulus Labill. on the Main Carpophagous Pests of Cotton Plant in Ivory Coast.
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Kobenan KC, Ochou GEC, Kouadio IS, Kouakou M, Bini KKN, Ceylan R, Zengin G, Boka NRK, and Ochou OG
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- Animals, Antioxidants pharmacology, Cholinesterase Inhibitors pharmacology, Cote d'Ivoire, Eucalyptol, Gossypium, Humans, Monoterpenes chemistry, Plant Oils chemistry, Eucalyptus chemistry, Insecticides chemistry, Insecticides pharmacology, Lippia chemistry, Oils, Volatile chemistry, Oils, Volatile pharmacology
- Abstract
The abusive and repeated use of synthetic chemical insecticides has proven to be harmful to human health and the viability of the cotton production system in Ivory Coast, so it is imperative to find alternatives. . Thus, the objective of this study was to study the chemical composition and biological activity of essential oils of Lippia multiflora (Verbenaceae) and Eucalyptus globulus (Myrtaceae) and to evaluate their insecticidal potential in the laboratory on three main pests of cotton. After essential oils extraction, their chemical composition was determined. Also, antioxidant activity and cholinesterase inhibitor of essential oils were evaluated. After that, different concentrations of the two essential oils were prepared and applied by contact on groups of insects constituted by ten. The essential oil of L. multiflora was the most toxic for the three pests tested. Indeed, the lethal concentrations (LC
50 ) were 1.74 %, 1.39 and 7.20 %, respectively, on Pectinophora gossypiella, Thaumatotibia leucotreta and Helicoverpa armigera. In contrast, the values obtained with E. globulus essential oil were nine to two times greater (16.05 %, 10.23 % and 16.32 %, respectively on these pests). With respect to the chemical composition of the essential oils, E. globulus essential oil was the richest in oxygenated monoterpenes (65 %) with 1,8-cineole or eucalyptol as the majority compound (61.6 %). The essential oil of L. multiflora was distinguished by a lower proportion of oxygenated monoterpenes (44.3 %), but it contained more terpene elements (24 vs. 15 for the essential oil of E. globulus). The essential oils of L. multiflora and E. globulus also showed significant inhibition of acetyl (2.13 and 2.16 mg galantamine equivalent (GALAE)/g, respectively) and butyryl cholinesterase (4.03 and 3.61 mg GALAE, respectively). L. multiflora was differentiated by its good inactivation of tyrosinases (163.46 versus 58.95 mg kojic acid equivalent (KAE)/g in E. globulus). Better antioxidant activity was observed with L. multiflora essential oil relative to DPPH (7.05±0.34 mg trolox equivalent (TE)/g). Biopesticides based on L. multiflora essential oil could be developed for the phytosanitary protection of cotton plant., (© 2022 Wiley-VHCA AG, Zurich, Switzerland.)- Published
- 2022
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38. The functional potential of nine Allium species related to their untargeted phytochemical characterization, antioxidant capacity and enzyme inhibitory ability.
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Rocchetti G, Zhang L, Bocchi S, Giuberti G, Ak G, Elbasan F, Yıldıztugay E, Ceylan R, Picot-Allain MCN, Mahomoodally MF, Lucini L, and Zengin G
- Subjects
- Acetylcholinesterase, Butyrylcholinesterase, Enzyme Inhibitors, Phytochemicals pharmacology, Plant Extracts pharmacology, Allium, Antioxidants pharmacology
- Abstract
In this study, the aerial parts and bulbs of nine Allium species were investigated for their functional phytochemical profile, in vitro antioxidant activities, acetylcholinesterase (AChE), butyrylcholinesterase (BChE), α-amylase, α-glucosidase, and tyrosinase inhibitory properties. Phenolics, alkaloids, glucosinolates and other sulfur-containing compounds were distinctively profiled in the different species. Maceration in methanol allowed recovering the highest cumulative phenolic content in A. scabrifolium (42.31 mg/g), followed by A. goekyigiti (33.15 mg/g) and A. atroviolaceum (28.35 mg/g). The aerial parts of all Allium species showed high in vitro antioxidant activity whereas methanolic extract of A. cappadocicum bulb showed the highest inhibition against AChE (2.44 mg galantamine equivalent/g) and the water extracts of A. isauricum aerial part were the best BChE inhibitors (4.31 mg galantamine equivalent/g). Bulbs were the richer source of oligosaccharides, and in vitro digestion determined an increase of oligosaccharides bioaccessibility. A promising nutraceutical potential could be highlighted in our understudied Allium species., (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Published
- 2022
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39. Novel Perceptions on Chemical Profile and Biopharmaceutical Properties of Mentha spicata Extracts: Adding Missing Pieces to the Scientific Puzzle.
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Zengin G, Ak G, Ceylan R, Uysal S, Llorent-Martínez E, Di Simone SC, Rapino M, Acquaviva A, Libero ML, Chiavaroli A, Recinella L, Leone S, Brunetti L, Cataldi A, Orlando G, Menghini L, Ferrante C, Balaha M, and di Giacomo V
- Abstract
Mentha spicata is one of the most popular species in the genus, and it is of great interest as a gastrointestinal and sedative agent in the folk medicine system. In this study, different M. spicata extracts, obtained by the use of four solvents (hexane, chloroform, acetone and acetone/water) were chemically characterized using HPLC-ESI-MS
n , which allowed for identification of 27 phenolic compounds. The extracts' antioxidant and enzyme inhibitory properties were investigated. In addition, neuroprotective effects were evaluated in hypothalamic HypoE22 cells, and the ability of the extracts to prevent the hydrogen peroxide-induced degradation of dopamine and serotonin was observed. The best antioxidant effect was achieved for all the extraction methods using acetone/water as a solvent. These extracts were the richest in acacetin, eriodictyol, hesperidin, sagerinic acid, naringenin, luteolin, chlorogenic acid, chrysoeriol and apigenin. The intrinsic antioxidant and enzyme inhibition properties of the acetone/water extract could also explain, albeit partially, its efficacy in preventing prostaglandin E2 overproduction and dopamine depletion (82.9% turnover reduction) in HypoE22 cells exposed to hydrogen peroxide. Thus, our observations can provide a scientific confirmation of the neuromodulatory and neuroprotective effects of M. spicata .- Published
- 2022
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40. Pharmacological Potential and Chemical Characterization of Bridelia ferruginea Benth.-A Native Tropical African Medicinal Plant.
- Author
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Mahomoodally MF, Jugreet S, Sinan KI, Zengin G, Ak G, Ceylan R, Jekő J, Cziáky Z, Angelini P, Angeles Flores G, Venanzoni R, Di Simone SC, Menghini L, Orlando G, Ferrante C, Etienne OK, and Tacchini M
- Abstract
To avail the possible pharmacological actions of Bridelia ferruginea Benth., the present investigation was designed to quantitatively analyze the total flavonoid and phenolic contents and assess the various antioxidant and enzyme inhibition properties of leaf and stem bark extracts (ethyl acetate, water and methanolic) of B. ferruginea. Anti-proliferative effect was also investigated against human colon cancer cells (HCT116) as well as the antimicrobial potential against multiple bacterial and fungal (yeasts and dermatophytes) strains. The methanolic and water extracts of the stem bark demonstrated the highest phenolic content (193.58 ± 0.98 and 187.84 ± 1.88 mg/g, respectively), while the leaf extracts showed comparatively higher flavonoid contents (24.37-42.31 mg/g). Overall, the methanolic extracts were found to possess the most significant antioxidant potency. Compared to the other extracts, methanolic extracts of the B. ferruginea were revealed to be most potent inhibitors of acetyl- and butyryl-cholinesterases, tyrosinase α -amylase, except α -glucosidase. Only the ethyl acetate extracts were found to inhibit glucosidase. Additionally, the stem bark methanolic extract also showed potent inhibitory activity against E. coli and gram-positive bacteria (MIC (minimum inhibitory concentration): 2.48-62.99 µg/mL), as well as all the tested fungi (MIC: 4.96-62.99 µg/mL). In conclusion, B. ferruginea can be regarded as a promising source of bioactive compounds displaying multifunctional pharmacological activities and thus is a potential candidate for further investigations in the endeavor to develop botanical formulations for pharmaceutical and cosmeceutical industries.
- Published
- 2021
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41. HPLC-DAD-UV analysis, anti-inflammatory and anti-neuropathic effects of methanolic extract of Sideritis bilgeriana (lamiaceae) by NF-κB, TNF-α, IL-1β and IL-6 involvement.
- Author
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Cavalcanti MRM, Passos FRS, Monteiro BS, Gandhi SR, Heimfarth L, Lima BS, Nascimento YM, Duarte MC, Araujo AAS, Menezes IRA, Coutinho HDM, Zengin G, Ceylan R, Aktumsek A, Quintans-Júnior LJ, and Quintans JSS
- Subjects
- Analgesics isolation & purification, Analgesics pharmacology, Animals, Anti-Inflammatory Agents isolation & purification, Chromatography, High Pressure Liquid, Dose-Response Relationship, Drug, Humans, Inflammation drug therapy, Inflammation pathology, Inflammation Mediators metabolism, Mice, Neuralgia drug therapy, Plant Extracts analysis, Anti-Inflammatory Agents pharmacology, Plant Extracts pharmacology, Sideritis chemistry
- Abstract
Medicinal plants remain an invaluable source for therapeutics of diseases that affect humanity. Sideritis bilgeriana (Lamiaceae) is medicinal plant used in Turkey folk medicine to reduce inflammation and pain, but few studies scientific corroborates its medicinal use so creating a gap between popular use and scientific evidence. Thus, we aimed to evaluate the pharmacological effects of the methanolic extract of S. bilgeriana (MESB) in rodents nociception models and also performed its phytochemical analysis. Firstly, a screening was carried out that enabled the identification of the presence of phenolic compounds and flavonoids. In view of this, a chromatographic method by HPLC-DAD-UV was developed that made it possible to identify chlorogenic acid and its quantification in MESB. MESB-treated mice (MESB 50, 100 and 200 mg/kg, p.o.) reduced mechanical hyperalgesia and myeloperoxidase activity (p < 0.01), and also showed a reduced pain behavior in capsaicin test. In the carrageenan-induced pleurisy test, MESB (100 mg/kg p.o.) significantly reduced the leukocyte (polymorphonuclear) count in the pleural cavity and equally decreased the TNF-α and IL-1β levels (p < 0.001). In the PSNL model, mechanical hyperalgesia was reduced on the first evaluation day and during the 7 days of evaluation compared to the vehicle group (p < 0.001). Thermal hyperalgesia was also reduced 1 h after treatment compared to the vehicle group (p < 0.001) and reversed the loss of force initially displayed by the animals, thus inferring an analgesic effect in the muscle strength test. Analysis of the marrow of these animals showed a decrease in the level of pro-inflammatory cytokine IL-6 (p < 0.001) and factor NF-κB, in relation to the control group (p < 0.05). Moreover, the MESB treatment produced no noticeable side effects, no disturb in motor performance and no signs of gastric or hepatic injury. Together, the results suggests that MESB could be useful to management of inflammation and neuropathic pain mainly by the management of pro-inflammatory mediators (NF-κB, TNF-α, IL-1β and IL-6), so reinforcing its use in popular medicine and corroborating the need for further chemical and pharmacological studies for the species., (Copyright © 2020. Published by Elsevier B.V.)
- Published
- 2021
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42. Chemical characterization, cytotoxic, antioxidant, antimicrobial, and enzyme inhibitory effects of different extracts from one sage ( Salvia ceratophylla L.) from Turkey: open a new window on industrial purposes.
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Uysal S, Zengin G, Sinan KI, Ak G, Ceylan R, Mahomoodally MF, Uysal A, Sadeer NB, Jekő J, Cziáky Z, Rodrigues MJ, Yıldıztugay E, Elbasan F, and Custodio L
- Abstract
In the present study, the methanolic, hydro-methanolic, dichloromethane, hexane and aqueous extracts of Salvia ceratophylla L. (Family: Lamiaceae), a lemon-scented herb, were tested for total phenolic (TPC) and flavonoid content (TFC) and antioxidant activities were evaluated using a battery of assays (2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing antioxidant power (FRAP), cupric reducing antioxidant capacity, total antioxidant capacity (TAC) (phosphomolybdenum) and metal chelating). Enzyme inhibitory effects were investigated using acetyl- (AChE), butyryl-cholinesterase (BChE), tyrosinase, α-amylase and α-glucosidase as target enzymes. Regarding the cytotoxic abilities, HepG2, B164A5 and S17 cell lines were used. The phytochemical profile was conducted using liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS). Our data showed that the methanolic aerial extracts possessed the highest phenolic (72.50 ± 0.63 mg gallic acid equivalent per g) and flavonoid (43.77 ± 1.09 mg rutin equivalent per g) contents. The hydro-methanolic aerial extract showed significant DPPH radical scavenging activity (193.40 ± 0.27 mg TE per g) and the highest reducing potential against CUPRAC (377.93 ± 2.38 mg TE per g). The best tyrosinase activity was observed with dichloromethane root extract (125.45 ± 1.41 mg kojic acid equivalent per g). Among the tested extracts, hexane root extract exerted the highest antimicrobial potential with a minimum inhibitory concentration value of 0.048 mg mL
-1 . Methanolic root extract showed the lowest cytotoxicity (28%) against HepG2 cells. Phytochemical analysis revealed the presence of important polyphenolic compounds including luteolin, gallic acid, rosmarinic acid, to name a few. This research can be used as one methodological starting point for further investigations on this lemon-scented herb., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)- Published
- 2021
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43. Network analysis, chemical characterization, antioxidant and enzyme inhibitory effects of foxglove (Digitalis cariensis Boiss. ex Jaub. & Spach): A novel raw material for pharmaceutical applications.
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Zengin G, Ceylan R, Sinan KI, Ak G, Uysal S, Mahomoodally MF, Lobine D, Aktumsek A, Cziáky Z, Jeko J, Behl T, Orlando G, Menghini L, and Ferrante C
- Subjects
- Monophenol Monooxygenase, Phenols pharmacology, Plant Extracts pharmacology, Antioxidants pharmacology, Digitalis
- Abstract
The present study outlines the phenolic composition and pharmacological properties of different extracts of Digitalis cariensis Boiss. ex Jaub. & Spach root and aerial parts. The metabolic profiles of the studied extracts were characterized by UHPLC-MS. The in vitro antioxidant and enzyme (acetylcholinesterase (AChE), butyrylcholinesterase (BChE), tyrosinase, α-amylase, and α-glucosidase) inhibitory potential of the extracts were determined. Bioinformatics and docking investigations were also conducted to support the enzyme inhibition test and predict putative targets for potential pharmacological applications. Overall, the methanolic extract followed by the water extract of the D. cariensis root were found to be superior source of antioxidant compounds except for metal chelating ability, in which the water extract of the root (26.34 ± 1.54 mg EDTAE/g) and aerial parts (16.47 ± 0.88 mg EDTAE/g) have showed the highest activity. The tested extracts were potent against AChE (9.11 ± 0.27-9.79 ± 0.28 mg GEs/g extract), α-amylase (0.12 ± 0.01- 0.50 ± 0.01 mmol ACEs/g extract) and α-glucosidase (0.28 ± 0.01-17.29 ± 0.24 mmol ACEs/ g extract). Notable activity against tyrosinase was displayed by the methanolic extracts (Root-MeOH: 123.71 ± 2.70 and aerial parts - MeOH: 137.96 ± 1.07 mg KAE/g extract), while none of the extracts were potent against BChE. According to docking investigations, the observed anti-tyrosinase effect could be related, at least partially, to the presence of luteolin, rosmarinic acid and kaempferol in the extracts. Results amassed herein is the first report on the biological attributes of D. cariensis, which validate the pharmacological uses of this plant., Competing Interests: Declaration of Competing Interest The authors report no declarations of interest., (Copyright © 2020 Elsevier B.V. All rights reserved.)
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- 2020
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44. Chemical fingerprints, antioxidant, enzyme inhibitory, and cell assays of three extracts obtained from Sideritis ozturkii Aytaç & Aksoy: An endemic plant from Turkey.
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Zengin G, Uğurlu A, Baloglu MC, Diuzheva A, Jekő J, Cziáky Z, Ceylan R, Aktumsek A, Picot-Allain CMN, and Fawzi Mahomoodally M
- Subjects
- Acetates chemistry, Antineoplastic Agents, Phytogenic pharmacology, Antioxidants pharmacology, Cell Line, Tumor, Cell Survival drug effects, Enzyme Inhibitors pharmacology, Humans, Methanol chemistry, Plant Extracts pharmacology, Sideritis growth & development, Solvents chemistry, Turkey, Water chemistry, Antineoplastic Agents, Phytogenic isolation & purification, Antioxidants isolation & purification, Enzyme Inhibitors isolation & purification, Plant Extracts isolation & purification, Sideritis chemistry
- Abstract
This study was geared towards assessing the possible antioxidant, enzyme inhibitory, and cytotoxic activities of ethyl acetate, methanol, and water extracts of Sideritis ozturkii Aytaç & Aksoy. The phytochemical profiles of the studied extracts were characterised by HPLC-MS/MS. The methanol extract, rich in phenolics (78.04 mg gallic acid equivalent/g), exhibited the strongest antioxidant activities. However, the ethyl acetate extract was the most active extract in the enzyme inhibitory assays. The water extract of S. ozturkii (1 mg/ml, 48 h incubation) slightly inhibited (22%) growth of human breast cancer cell line (MDA-MB-231 cells). On the other hand, the ethyl acetate and methanol extracts showed strong inhibition (98% and 97%, respectively) of MDA-MB-231 cells and caused apoptotic cell death. Scientific data generated from this study further appraises the multiple biological activities of plants belonging to the Sideritis genus. In addition, preliminary evidence gathered from the current investigation advocates for further studies geared towards the preparation of therapeutic formulations from S. ozturkii., (Copyright © 2019 Elsevier B.V. All rights reserved.)
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- 2019
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45. An extensive study for binary characterisation of adrenal tumours.
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Koyuncu H, Ceylan R, Asoglu S, Cebeci H, and Koplay M
- Subjects
- Adrenal Gland Neoplasms diagnostic imaging, Databases as Topic, ROC Curve, Adrenal Gland Neoplasms diagnosis, Algorithms
- Abstract
On adrenal glands, benign tumours generally change the hormone equilibrium, and malign tumours usually tend to spread to the nearby tissues and to the organs of the immune system. These features can give a trace about the type of adrenal tumours; however, they cannot be observed all the time. Different tumour types can be confused in terms of having a similar shape, size and intensity features on scans. To support the evaluation process, biopsy process is applied that includes injury and complication risks. In this study, we handle the binary characterisation of adrenal tumours by using dynamic computed tomography images. Concerning this, the usage of one more imaging modalities and biopsy process is wanted to be excluded. The used dataset consists of 8 subtypes of adrenal tumours, and it seemed as the worst-case scenario in which all handicaps are available against tumour classification. Histogram, grey level co-occurrence matrix and wavelet-based features are investigated to reveal the most effective one on the identification of adrenal tumours. Binary classification is proposed utilising four-promising algorithms that have proven oneself on the task of binary-medical pattern classification. For this purpose, optimised neural networks are examined using six dataset inspired by the aforementioned features, and an efficient framework is offered before the use of a biopsy. Accuracy, sensitivity, specificity, and AUC are used to evaluate the performance of classifiers. Consequently, malign/benign characterisation is performed by proposed framework, with success rates of 80.7%, 75%, 82.22% and 78.61% for the metrics, respectively. Graphical abstract.
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- 2019
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46. Adrenal tumor segmentation method for MR images.
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Barstuğan M, Ceylan R, Asoglu S, Cebeci H, and Koplay M
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- Abdominal Fat diagnostic imaging, Algorithms, Diagnosis, Computer-Assisted statistics & numerical data, Humans, Image Interpretation, Computer-Assisted methods, Image Interpretation, Computer-Assisted statistics & numerical data, Liver diagnostic imaging, Magnetic Resonance Imaging statistics & numerical data, Adrenal Gland Neoplasms diagnostic imaging, Diagnosis, Computer-Assisted methods, Magnetic Resonance Imaging methods
- Abstract
Background and Objective: Adrenal tumors, which occur on adrenal glands, are incidentally determined. The liver, spleen, spinal cord, and kidney surround the adrenal glands. Therefore, tumors on the adrenal glands can be adherent to other organs. This is a problem in adrenal tumor segmentation. In addition, low contrast, non-standardized shape and size, homogeneity, and heterogeneity of the tumors are considered as problems in segmentation., Methods: This study proposes a computer-aided diagnosis (CAD) system to segment adrenal tumors by eliminating the above problems. The proposed hybrid method incorporates many image processing methods, which include active contour, adaptive thresholding, contrast limited adaptive histogram equalization (CLAHE), image erosion, and region growing., Results: The performance of the proposed method was assessed on 113 Magnetic Resonance (MR) images using seven metrics: sensitivity, specificity, accuracy, precision, Dice Coefficient, Jaccard Rate, and structural similarity index (SSIM). The proposed method eliminates some of the discussed problems with success rates of 74.84%, 99.99%, 99.84%, 93.49%, 82.09%, 71.24%, 99.48% for the metrics, respectively., Conclusions: This study presents a new method for adrenal tumor segmentation, and avoids some of the problems preventing accurate segmentation, especially for cyst-based tumors., (Copyright © 2018 Elsevier B.V. All rights reserved.)
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- 2018
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47. Integration of in vitro and in silico perspectives to explain chemical characterization, biological potential and anticancer effects of Hypericum salsugineum: A pharmacologically active source for functional drug formulations.
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Bender O, Llorent-Martínez EJ, Zengin G, Mollica A, Ceylan R, Molina-García L, Fernández-de Córdova ML, and Atalay A
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- Enzyme Inhibitors metabolism, Humans, MCF-7 Cells, Models, Molecular, Molecular Docking Simulation, Plant Extracts metabolism, Polyphenols analysis, Polyphenols pharmacology, Computer Simulation, Drug Compounding, Enzyme Inhibitors chemistry, Enzyme Inhibitors pharmacology, Hypericum chemistry, Plant Extracts chemistry, Plant Extracts pharmacology
- Abstract
The genus Hypericum is one of the most popular genera in both traditional medicine and scientific platform. This study is designed to provide conceptual insights on the biological potential and chemical characterization of H. salsugineum, which is endemic to Turkey. The qualitative and quantitative phenolic content of the extracts was characterized by HPLC-ESI-MSn. Biological efficiency was investigated by enzyme inhibitory assays (cholinesterases, tyrosinase, amylase, and glucosidase) and anti-cancer efficacy tests (anti-proliferative activities with the iCELLigence technology, colony formation and wound healing scratch assays). Phenolic acids (3-O-caffeoylquinic, 5-O-caffeoylquinic, and 4-O-caffeoylquinic acids) were the predominant group in the studied extracts, although several flavonoids were also detected and quantified. The extracts exhibited good inhibitory effects on tyrosinase and glucosidase, while they had weak ability against cholinesterases and amylase. Computational studies were also performed to explain the interactions between the major phenolics and these enzymes. The extracts displayed significant anti-cancer effects on breast carcinoma cell lines. Our findings suggest that Hypericum salsugineum could be valued as a potential source of biologically-active compounds for designing novel products., Competing Interests: The authors have declared that no competing interests exist.
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- 2018
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48. A novel pipeline for adrenal tumour segmentation.
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Koyuncu H, Ceylan R, Erdogan H, and Sivri M
- Subjects
- Abdomen diagnostic imaging, Algorithms, Contrast Media, Humans, Pattern Recognition, Automated, Reproducibility of Results, Sensitivity and Specificity, Adrenal Gland Neoplasms diagnostic imaging, Image Processing, Computer-Assisted methods, Imaging, Three-Dimensional, Signal Processing, Computer-Assisted, Tomography, X-Ray Computed
- Abstract
Background and Objective: Adrenal tumours occur on adrenal glands surrounded by organs and osteoid. These tumours can be categorized as either functional, non-functional, malign, or benign. Depending on their appearance in the abdomen, adrenal tumours can arise from one adrenal gland (unilateral) or from both adrenal glands (bilateral) and can connect with other organs, including the liver, spleen, pancreas, etc. This connection phenomenon constitutes the most important handicap against adrenal tumour segmentation. Size change, variety of shape, diverse location, and low contrast (similar grey values between the various tissues) are other disadvantages compounding segmentation difficulty. Few studies have considered adrenal tumour segmentation, and no significant improvement has been achieved for unilateral, bilateral, adherent, or noncohesive tumour segmentation. There is also no recognised segmentation pipeline or method for adrenal tumours including different shape, size, or location information., Methods: This study proposes an adrenal tumour segmentation (ATUS) pipeline designed to eliminate the above disadvantages for adrenal tumour segmentation. ATUS incorporates a number of image methods, including contrast limited adaptive histogram equalization, split and merge based on quadtree decomposition, mean shift segmentation, large grey level eliminator, and region growing., Results: Performance assessment of ATUS was realised on 32 arterial and portal phase computed tomography images using six metrics: dice, jaccard, sensitivity, specificity, accuracy, and structural similarity index. ATUS achieved remarkable segmentation performance, and was not affected by the discussed handicaps, on particularly adherence to other organs, with success rates of 83.06%, 71.44%, 86.44%, 99.66%, 99.43%, and 98.51% for the metrics, respectively, for images including sufficient contrast uptake., Conclusions: The proposed ATUS system realises detailed adrenal tumour segmentation, and avoids known disadvantages preventing accurate segmentation., (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Published
- 2018
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49. Elimination of white Gaussian noise in arterial phase CT images to bring adrenal tumours into the forefront.
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Koyuncu H and Ceylan R
- Subjects
- Adrenal Gland Neoplasms physiopathology, Datasets as Topic, Humans, Tomography, X-Ray Computed methods, Adrenal Gland Neoplasms diagnostic imaging, Algorithms, Imaging, Three-Dimensional, Signal-To-Noise Ratio
- Abstract
Dynamic Contrast-Enhanced Computed Tomography (DCE-CT) is applied to observe adrenal tumours in detail by utilising from the contrast matter, which generally brings the tumour into the forefront. However, DCE-CT images are generally influenced by noises that occur as the result of the trade-off between radiation doses vs. noise. Herein, this situation constitutes a challenge in the achievement of accurate tumour segmentation. In CT images, most of the noises are similar to Gaussian Noise. In this study, arterial phase CT images containing adrenal tumours are utilised, and elimination of Gaussian Noise is realised by fourteen different techniques reported in literature for the achievement of the best denoising process. In this study, the Block Matching and 3D Filtering (BM3D) algorithm typically achieve reliable Peak Signal-to-Noise Ratios (PSNR) and resolves challenges of similar techniques when addressing different levels of noise. Furthermore, BM3D obtains the best mean PSNR values among the first five techniques. BM3D outperforms to other techniques by obtaining better Total Statistical Success (TSS), CPU time and computation cost. Consequently, it prepares clearer arterial phase CT images for the next step (segmentation of adrenal tumours)., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2018
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50. An Efficient Pipeline for Abdomen Segmentation in CT Images.
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Koyuncu H, Ceylan R, Sivri M, and Erdogan H
- Subjects
- Abdomen diagnostic imaging, Humans, Reproducibility of Results, Sensitivity and Specificity, Digestive System Diseases diagnostic imaging, Image Interpretation, Computer-Assisted methods, Radiography, Abdominal methods, Tomography, X-Ray Computed methods
- Abstract
Computed tomography (CT) scans usually include some disadvantages due to the nature of the imaging procedure, and these handicaps prevent accurate abdomen segmentation. Discontinuous abdomen edges, bed section of CT, patient information, closeness between the edges of the abdomen and CT, poor contrast, and a narrow histogram can be regarded as the most important handicaps that occur in abdominal CT scans. Currently, one or more handicaps can arise and prevent technicians obtaining abdomen images through simple segmentation techniques. In other words, CT scans can include the bed section of CT, a patient's diagnostic information, low-quality abdomen edges, low-level contrast, and narrow histogram, all in one scan. These phenomena constitute a challenge, and an efficient pipeline that is unaffected by handicaps is required. In addition, analysis such as segmentation, feature selection, and classification has meaning for a real-time diagnosis system in cases where the abdomen section is directly used with a specific size. A statistical pipeline is designed in this study that is unaffected by the handicaps mentioned above. Intensity-based approaches, morphological processes, and histogram-based procedures are utilized to design an efficient structure. Performance evaluation is realized in experiments on 58 CT images (16 training, 16 test, and 26 validation) that include the abdomen and one or more disadvantage(s). The first part of the data (16 training images) is used to detect the pipeline's optimum parameters, while the second and third parts are utilized to evaluate and to confirm the segmentation performance. The segmentation results are presented as the means of six performance metrics. Thus, the proposed method achieves remarkable average rates for training/test/validation of 98.95/99.36/99.57% (jaccard), 99.47/99.67/99.79% (dice), 100/99.91/99.91% (sensitivity), 98.47/99.23/99.85% (specificity), 99.38/99.63/99.87% (classification accuracy), and 98.98/99.45/99.66% (precision). In summary, a statistical pipeline performing the task of abdomen segmentation is achieved that is not affected by the disadvantages, and the most detailed abdomen segmentation study is performed for the use before organ and tumor segmentation, feature extraction, and classification.
- Published
- 2018
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