84 results on '"Karakaya, N"'
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2. Regression model-based predictions of diel, diurnal and nocturnal dissolved oxygen dynamics after wavelet denoising of noisy time series
- Author
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Evrendilek, F. and Karakaya, N.
- Published
- 2014
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- View/download PDF
3. Research on change of phase transformation temperatures and electrical resistance triggered by heat treatment of alloy from Cu–Mn system
- Author
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Karakaya, N. and Aldirmaz, E.
- Published
- 2016
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- View/download PDF
4. Spatiotemporal modeling of saturated dissolved oxygen through regressions after wavelet denoising of remotely and proximally sensed data
- Author
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Evrendilek, F. and Karakaya, N.
- Published
- 2015
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5. Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream
- Author
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Karakaya, N. and Evrendilek, F.
- Published
- 2010
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6. Chemical composition of tourmaline from the Asarcık Pb–Zn–Cu ± U deposit, Şebinkarahisar, Turkey
- Author
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Yavuz, F., Fuchs, Y., Karakaya, N., and Karakaya, M. Ç.
- Published
- 2008
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7. Vüs’at O. Bener’in Varlık Dergisindeki Hikâyelerinde Kahramanların Benlik Algısı
- Author
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Karakaya, N, primary
- Published
- 2021
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8. Sarcoplasmic-endoplasmic reticulum [Ca.sup.2+]-ATPase inhibition prevents endothelin A receptor antagonism in rat aorta
- Author
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Tosun, M., Erac, Y., Selli, C., and Karakaya, N.
- Subjects
Vascular smooth muscle -- Research ,Caveolae -- Research ,Biological sciences - Abstract
This study tested whether sarcoplasmic-endoplasmic reticulum [Ca.sup.2+]-ATPase regulates the ability of endothelin receptor antagonist to inhibit the endothelin-1 constriction. The endothelin A receptor antagonist BQ-123 (1 [micro]M) completely relaxed constriction to 10 nM endothelin-1 in endothelium- denuded rat aorta. Challenge with cyclopiazonic acid (10 [micro]M), a sarcoplasmicendoplasmic reticulum [Ca.sup.2+]-ATPase inhibitor, during the plateau of endothelin-1 constriction enhanced the constriction by ~30%. BQ-123 relaxed the endothelin-1 plus cyclopiazonic acid constriction by only ~10%. In contrast, prazosin (1 [micro]M), an [alpha]-adrenergic receptor antagonist, still completely relaxed the 0.3 [micro]M phenylephrine constriction in the presence of cyclopiazonic acid. Verapamil relaxed the endothelin-1 plus cyclopiazonic acid constriction by ~30%, whereas [Ni.sup.2+] and 2-aminoethoxydiphenyl borate, nonselective cation channel and store-operated channel blockers, respectively, completely relaxed the constriction. These results suggest that lowered sarcoplasmicendoplasmic reticulum [Ca.sup.2+]-ATPase activity selectively decreases the ability of endothelin receptor antagonist to inhibit the endothelin A receptor. The decreased antagonism may be related to the opening of store-operated channels and subsequent greater internalization of endothelin A receptor. BQ-123; vascular smooth muscle; store-operated calcium; caveola
- Published
- 2007
9. Relation between spring-water chemistry and hydrothermal alteration in the Şaplıca volcanic rocks, Şebinkarahisar (Giresun, Turkey)
- Author
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Karakaya, N., Karakaya, M.Ç., Nalbantçılar, M.T., and Yavuz, F.
- Published
- 2007
- Full Text
- View/download PDF
10. Erratum to: Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream
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Karakaya, N. and Evrendilek, F.
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- 2010
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11. Spatiotemporal Change Detection Analysis of Turkish Lake Water Surface Area in Response to Anthropogenic Ecosystem Disturbances Using Long-Term Landsat TM/ETM+ Data
- Author
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Durmaz F, Karakaya N, and Evrendilek F
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Ancillary data ,Ecosystem health ,Ecology ,Climate change ,Environmental science ,Ecosystem ,Time series ,Temporal scales ,Water resource management ,Natural resource ,Change detection - Abstract
The provision of diverse ecosystem goods and services by lakes is vital to ecosystem health and economic well-being of nations or regions. Securing ecologically safe lake water quality and quantity through sustainable uses and management practices concerns both present and future generations. The present study quantifies long-term impacts of human-induced disturbances including climate change on water surface areas of the 18 largest Turkish lakes. Spatiotemporal change detection analysis was carried out using long-term Landsat time series data between 1973 and 2014 with the aid of geographical information systems (GIS). Supervised and unsupervised classification techniques were combined to temporally differentiate and spatially delineate lake water surface areas using ancillary data. Over the period of about 40 years, lake surface area decreased for 15 lakes at a mean annual rate of 0.96 km2 but increased for three lakes at a mean annual rate of 0.17 km2. These spatiotemporal changes may be attributed to such human-induced pressures as drought, sectoral water uses/withdrawals, draining, and landfilling. These changes in turn lead to losses of or damages to both marketable and non-marketable ecosystem benefits that the lakes provide with humans at the local-to-regional spatial scales in the long-to-short-term temporal scales. The integration of remote sensing and GIS techniques adopted in this study allows for dynamic monitoring of not only lake water quality and quantity but also other natural resources, thus facilitating a timely and effective development of preventive and mitigative measures.
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- 2016
12. Monitoring of Ecosystem Metabolisms through Remotely and Proximally Sensed High-frequency Data toward Enhanced Sinks and Reduced Sources of Greenhouse Gases
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Evrendilek F and Karakaya N
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Ecology ,Greenhouse gas ,Frequency data ,Environmental science ,Ecosystem ,Atmospheric sciences - Published
- 2016
13. Thermal Properties of Some Turkish Peloids and Clay Minerals for Their Use in Pelotherapy
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Karakaya, M. Çelik, primary, Karakaya, N., additional, and Vural, H. Cingilli, additional
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- 2016
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14. Integrating Atr-Ftir And Data-Driven Models To Predict Total Soil Carbon And Nitrogen Towards Sustainable Watershed Management
- Author
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Aslan-Sungur, G., Fatih Evrendilek, Karakaya, N., Gungor, K., and Kilic, S.
- Abstract
The use of Attenuated Total Reflectance (ATR) is an alternative method in determining carbon (C), nitrogen (N) and other elemental contents of organic and inorganic soils for which diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy has been mostly utilized. In this study, the combined use of ATR-Fourier transform infrared (FTIR) spectroscopy and partial least square regression (PLSR) or artificial neural network (ANN) models in estimating total soil C and N have been explored which provide direct, rapid, economical and multiple in situ measurements. Total soil C and N data obtained from 153 soil samples across agricultural lands and analyzed using CNH elemental analyzer were used to build PLSR and ANN models as a function of ATR-FTIR spectrum ranges based on a training dataset with leave-one-out cross validation (LCV) and independent validation (IV) dataset that randomly constitute 67% and 33% of the entire dataset respectively.
- Published
- 2013
15. Spatiotemporal modeling of saturated dissolved oxygen through regressions after wavelet denoising of remotely and proximally sensed data
- Author
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Evrendilek, F., primary and Karakaya, N., additional
- Published
- 2014
- Full Text
- View/download PDF
16. Reply to discussion on “Relation between spring-water chemistry and hydrothermal alteration in the Şaplica volcanic rocks, Şebinkarahisar (Giresun, Turkey)” [Journal of Geochemical Exploration, 2007, v. 93, p. 35–46]
- Author
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Karakaya, N., Karakaya, M.Ç., Nalbantçılar, M.T., and Yavuz, F.
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- 2009
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17. Serebral paralizili hastalarda fizyoterapi ile alınan sonuçlar
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Karakaya, N, Taşkıran, H, Altuğ, Filiz, and Baş, U
- Abstract
Not Available
- Published
- 1996
18. Water quality time series for Big Melen stream (Turkey): its decomposition analysis and comparison to upstream
- Author
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Karakaya, N., primary and Evrendilek, F., additional
- Published
- 2009
- Full Text
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19. 295: Levobupivacaine Plus Fentanyl Versus Bupivacaine Plus Fentany in Epidural Anesthesia for Lumbar Disc Surgery
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AKARSU, T, primary, ALTAS, M, additional, KARAKAYA, N, additional, KULAKSIZOGLU, O, additional, and HUNDEMIR, C, additional
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- 2008
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20. Levobupivacaine Plus Fentanyl Versus Bupivacaine Plus Fentany in Epidural Anesthesia for Lumbar Disc Surgery
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Akarsu, T., primary, Altaş, M., additional, Karakaya, N., additional, Kulakszoglu, O., additional, and Hundemir, C., additional
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- 2008
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21. Coal-based bottom ash (CBBA) waste material as adsorbent for removal of textile dyestuffs from aqueous solution
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DINCER, A, primary, GUNES, Y, additional, and KARAKAYA, N, additional
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- 2007
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22. Comparison of activated carbon and bottom ash for removal of reactive dye from aqueous solution
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DINCER, A, primary, GUNES, Y, additional, KARAKAYA, N, additional, and GUNES, E, additional
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- 2007
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23. Mineralogical and chemical characterization of sepiolite occurrences at Karapinar (Konya Basin, Turkey)
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Karakaya, N., primary, Karakaya, M. Çelik, additional, Temel, A., additional, Küpeli, Ş., additional, and Tunoğlu, C., additional
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- 2004
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24. Occurrences of Saplima Alunite Deposits and Properties in Sebinkarahisar (Giresun, NE Turkey) Volcanic Field
- Author
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Karakaya, N., primary
- Published
- 1998
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25. Monitoring of lake water quality along with trophic gradient using landsat data.
- Author
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Karakaya, N., Evrendilek, F., Aslan, G., Gungor, K., and Karakas, D.
- Subjects
WATER quality ,DATA analysis ,ENVIRONMENTAL monitoring ,WATER temperature ,REGRESSION analysis ,DISSOLVED oxygen in water ,REMOTE sensing - Abstract
Effect of differential trophic states on remote sensing-based monitoring and quantification of surface water quality is an important but understudied context. Landsat ETM+ data-based multiple linear regression models were conducted to quantify dynamics of lake surface water quality along oligotrophic-to-eutrophic gradient and to explore the influence of trophic state on the detection of water quality dynamics by the best multiple linear regression models. The best multiple linear regression models of dissolved oxygen, chlorophyll-a, Secchi depth, water temperature, and turbidity had R²
adj values ranging from 36.2 % in water temperature to 93.1% in dissolved oxygen for eutrophicYenicaga Lake and from 36.1 % in Secchi depth to 99.7 % in water temperature for oligotrophic Abant Lake. The difference in the trophic state between Lakes Abant and Yenicaga , significantly affected the composition of the nine Landsat ETM+ spectral bands included in the multiple linear regression models as well as the predictive power of the multiple linear regression models. Remote sensing-based monitoring of lake water quality variables appears to be promising in terms of devising adaptive management decisions towards sustainability of water resources. [ABSTRACT FROM AUTHOR]- Published
- 2011
26. Sarcoplasmic-endoplasmic reticulum Ca2+ -ATPase inhibition prevents endothelin A receptor antagonism in rat aorta.
- Author
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Tosun, M., Erac, Y., Selli, C., and Karakaya, N.
- Subjects
ENDOTHELINS ,SARCOPLASMIC reticulum ,ENDOPLASMIC reticulum ,ADENOSINE triphosphatase ,VERAPAMIL - Abstract
This study tested whether sarcoplasmic-endoplasmic reticulum Ca
2+ -ATPase regulates the ability of endothelin receptor antagonist to inhibit the endothelin- 1 constriction. The endothelin A receptor antagonist BQ-123 (1 µM) completely relaxed constriction to 10 nM endothelin- 1 in endothelium-denuded rat aorta. Challenge with cyclopiazonic acid (10 µM), a sarcoplasmic-endoplasmic reticulum Ca2+ -ATPase inhibitor, during the plateau of endothelin-1 constriction enhanced the constriction by ~30%. BQ-123 relaxed the endothelin-1 plus cyclopiazonic acid constriction by only ~10%. In contrast, prazosin (1 µM), an α-adrenergic receptor antagonist, still completely relaxed the 0.3 µM phenylephrine constriction in the presence of cyclopiazonic acid. Verapamil relaxed the endothelin-1 plus cyclopiazonic acid constriction by ~30%, whereas Ni2+ and 2-aminoethoxydiphenyl borate, nonselective cation channel and store-operated channel blockers, respectively, completely relaxed the constriction. These results suggest that lowered sarcoplasmic-endoplasmic reticulum Ca2+ -ATPase activity selectively decreases the ability of endothelin receptor antagonist to inhibit the endothelin A receptor. The decreased antagonism may be related to the opening of store-operated channels and subsequent greater internalization of endothelin A receptor. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
27. Effect of blending conditions on the properties of EPDM/organoclay nanocomposites
- Author
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Karşal, C., Metin Tanoğlu, Odabaş, S., Ersoy, O. G., Karakaya, N., TR30837, Karşal, Çiçek, Tanoğlu, Metin, and Izmir Institute of Technology. Mechanical Engineering
- Subjects
Mechanical properties ,Nanoclays ,Nanocomposites - Abstract
17th International Conference on Composite Materials, ICCM-17; Edinburgh; United Kingdom; 27 July 2009 through 31 July 2009, The effects of blending conditions on the microstructural and mechanical properties of EPDM / organo modified montmorillonite (OMMT) nanocomposites at various clay loadings were investigated. The effects of the processing conditions were manifested in both the morphology and mechanical properties, which showed significant increase when optimized process conditions are applied., TÜBİTAK-MAG project 106M157
28. Dermatoglyphic analyses in children with cerebral palsy
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Simsek S, Taskiran H, Karakaya N, Fistik T, Solak M, and Ecir Ali Cakmak
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Male ,Adolescent ,heredity ,Sex Factors ,Genetic ,Humans ,controlled study ,human ,Dermatoglyphics ,Child ,Cerebral Palsy/*diagnosis/genetics ,Child, Preschool ,Down Syndrome/diagnosis ,Female ,Infant ,Neuromotor defects ,cerebral palsy ,child ,clinical article ,finger dermatoglyphics ,Cerebral Palsy ,childhood disease ,article ,dermatoglyphics ,neurologic disease ,body regions ,Down Syndrome ,motor dysfunction - Abstract
This study was intended to elucidate the diagnostic values of dermatoglyphic features on the 45 cerebral palsy (CP) patients (28 boys and 17 girls). There were 50 healthy children in the control group. Dermatoglyphic samples were obtained from the both groups by using the paper and ink method and than analysed. The types of dermal patterns of fingertips, the counts of total ridges, the counts of a-b ridges, the values of atd angles, presence or absence of dermal patterns in the hypothenar, thenar/I, II, III, IV interdigital areas, presence of absence of the palmar flexion lines, were compared between the children with CP and control group. It was found that arch, radial loop, whorl prints have increased and ulnar print has decreased in boys investigated which was significant statistically (p < 0.001). No difference was found between investigation and control groups of girls (p > 0.05). The total ridge counts in boys and girls of the investigation group were found significantly decreasing according to the control group (p < 0.001). There was an important decrease in the counts of a-b ridges of investigation group as compared to controls. It was significant in boys (p < 0.01) but not in girls (p > 0.05). The values of atd angles of the investigation group have increased in the control group (p < 0.001 in girls and p < 0.01 in boys). The dermal prints in the hypothenar, thenar/I, II, III and IV interdigital areas showed important differences in the investigation group when compared with the control group (p < 0.01). No clear distinction occurred between the two groups from the viewpoint of palmar flexion lines (p > 0.05). In conclusion, remarkable differences in comparison to controls were found in the dermatoglyphic features of CP cases. In our opinion, by undertaking more studies on the subject and examining a higher number of cases it will be possible to obtain useful data in CP cases indicative of etiologically.
29. Quantifying Environmental Flow Requirement Towards Watershed Sustainability
- Author
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Karakaya, N., Fatih Evrendilek, BAİBÜ, Mühendislik Fakültesi, Çevre Mühendisliği Bölümü, Karakaya, Nusret, and Evrendilek, Fatih
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Sustainability ,Riverine Ecosystems ,General Chemistry ,Environmental Flow Requirement ,Adaptive Management - Abstract
WOS:000317245800058 ,Humankind is prone to exceeding biogeochemical limits to freshwater resources in the face of rapidly increasing demands of global population and economic growth Without measurable indicator of sustainability. Such indicators with a differing Methodological complexity were developed for rivers in order to estimate water quantity required to secure their long-term productive state. Generally, environmental flow requirement method was applied to economically significant rivers Where intensive fisheries take place and was defined as the sum of flow requirements that fish stocks demand. Recently, more robust methods for environmental flow requirement have been developed that consider multiple environmental factors such as demands of other organisms (e.g. invertebrates and water birds), ecosystem Structure, (e.g., biogeoclimate, geomorphology, flora, fauna, biodiversity and flood plain) and ecosystem function (e.g. nutrient cycles, primary production and ecosystem respiration). This study assesses the concept of environmental flow requirement in the context of Big Melen water transfer project as a case study.
30. Quantifying Spatial Variability of Peat Soil Carbon and Nitrogen using Infrared Spectroscopy, Statistical and Geo-Statistical Models
- Author
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Guler, A., Fatih Evrendilek, and Karakaya, N.
- Abstract
Chemical and biological analyses of soil carbon (C) and nitrogen (N) are time-consuming or require fresh material in cases of intensive in situ sampling. Infrared spectroscopy is one of the rapid and non-destructive methods that can be applied to a large number of soil samples. In this study, Attenuated Total Reflectance (ATR) Fourier transform infrared (FTIR) spectroscopy in the range of 600 to 4000 cm(-1) was assessed using partial least squares (PLS) regression model to predict total C and N of peat soils. ATR/FTIR-based PLS models had r(2) values of about 0.8 for fitted functions and 0.7 for leave-one-out cross-validations. Using an independent dataset to compare soil C and N values estimated by ATR/FTIR-based PLS models versus those measured using CHN elemental analyzer led to r(2) value of 0.97 for both soil C and N. The combined use of ATR/FTIR-based PLS models and inverse distance weighting (IDW) interpolation appears to be a promising method to estimate total C and N of peat soils for rapid data acquisition across spatially extensive areas.
31. Monitoring of lake water quality along with trophic gradient using landsat data
- Author
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Karakaya, N., Fatih Evrendilek, Aslan, G., Gungor, K., and Karakas, D.
32. Ultrasound-assisted adsorption of toxic dyes by cottonseed cake: artificial neural networks, regression models and response surface optimization
- Author
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Buyukada, M., Fatih Evrendilek, and Karakaya, N.
33. Temperature effects explain continental scale distribution of cyanobacterial toxins
- Author
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Sigrid Haande, Christos Avagianos, Vítor Gonçalves, Lisette N. de Senerpont Domis, Carlos Rochera, Ana García-Murcia, Kerstin Häggqvist, Reyhan Akçaalan, Jordi Noguero-Ribes, Mariusz Pełechaty, Wojciech Krztoń, Hans-Peter Grossart, Jutta Fastner, Bárbara Úbeda, Wojciech Pęczuła, Nur Filiz, Justyna Kobos, Juan M. Soria, Elif Neyran Soylu, Lars-Anders Hansson, Filip Stević, Luděk Bláha, Hanna Mazur-Marzec, Jolanda M. H. Verspagen, Burçin Önem, Karl-Otto Rothhaupt, Nico Salmaso, Abdulkadir Yağcı, David Parreño Duque, Ksenija Savadova, Nusret Karakaya, Aleksandra Pełechata, Yvon Verstijnen, Carmen Pérez-Martínez, Pauliina Salmi, Gizem Bezirci, Tuğba Ongun Sevindik, Svetislav Krstić, Rahmi Uysal, Laura Seelen, Eloísa Ramos-Rodríguez, Spela Remec-Rekar, Sven Teurlincx, Monserrat Real, Meriç Albay, Donald C. Pierson, Susana Romo, Kristiina Mustonen, Kirsten Christoffersen, Valentini Maliaka, Estela Rodríguez-Pérez, Joanna Rosińska, Nilsun Demir, Mehmet Tahir Alp, Elvira Romans, João Morais, Daniel Szymański, Danielle Machado-Vieira, Damian Chmura, Evanthia Mantzouki, Teresa Vegas-Vilarrúbia, Antonio Picazo, Mikołaj Kokociński, Anastasia Hiskia, Christine Edwards, Yang Yang, Irma Vitonytė, Mehmet Cesur, Agnieszka Bańkowska-Sobczak, Iwona Kostrzewska-Szlakowska, Nikoletta Tsiarta, Anđelka Plenković-Moraj, Miquel Lürling, Ryszard Gołdyn, Kristel Panksep, Kemal Celik, Anna Kozak, Jose Luis Cereijo, Pablo Urrutia-Cordero, Petra M. Visser, Rodan Geriš, Uğur Işkın, Leonardo Cerasino, Kadir Çapkın, Victor C. Perello, Carmen Cillero-Castro, Arda Özen, Manel Leira, Enrique Moreno-Ostos, Şakir Çinar, Agnieszka Budzyńska, Faruk Maraşlıoğlu, Pedro M. Raposeiro, Theodoros M. Triantis, Agnieszka Pasztaleniec, Sevasti-Kiriaki Zervou, Elżbieta Wilk-Woźniak, Edward Walusiak, Kersti Kangro, Jorge Juan Montes-Pérez, Triantafyllos Kaloudis, Mari Carmen Trapote, Pablo Alcaraz-Párraga, José María Blanco, Marek Kruk, Hans W. Paerl, Lidia Nawrocka, Meryem Beklioglu, Antonio Camacho, Moritz Buck, Biel Obrador, Ilona Gagala, Lauri Arvola, Elżbieta Szeląg-Wasielewska, Petar Žutinić, Giovanna Flaim, Núria Catalán, R. Carballeira, Alinne Gurjão de Oliveira, Magdalena Frąk, Alo Laas, Magdalena Grabowska, Dubravka Špoljarić Maronić, Meral Apaydın Yağcı, Itana Bokan Vucelić, Ana Maria Antão-Geraldes, Tõnu Feldmann, Natalia Jakubowska-Krepska, Trine Perlt Warming, Armand Hernández, Anna C. Santamans, Fuat Bilgin, Cayelan C. Carey, Joana Mankiewicz-Boczek, Elísabeth Fernández-Morán, Mete Yilmaz, Iwona Jasser, Boris Aleksovski, Michał Wasilewicz, Agnieszka Ochocka, David García, Lea Tuvikene, Roberto L. Palomino, B.W. Ibelings, Hatice Tunca, Birger Skjelbred, Joan Gomà, Jūratė Karosienė, Maria G. Antoniou, Vitor Vasconcelos, Mehmet Ali Turan Koçer, Eti E. Levi, Markéta Fránková, Beata Madrecka, Barbara Pawlik-Skowrońska, Jeremy Fonvielle, Korhan Özkan, Maciej Karpowicz, Özden Fakioglu, Lucia Chomova, Magdalena Toporowska, Ülkü Nihan Tavşanoğlu, Jūratė Kasperovičienė, Latife Köker, Kinga Kwasizur, Koray Ozhan, Valeriano Rodríguez, William Colom-Montero, Ulrike Obertegger, Micaela Vale, Spyros Gkelis, Michał Niedźwiecki, Tunay Karan, Piotr Domek, Judita Koreivienė, Andrea G. Bravo, Justyna Sieńska, Jessica Richardson, Hana Nemova, Cafer Bulut, Jordi Delgado-Martín, Tanja Žuna Pfeiffer, Marija Gligora Udovič, Manthos Panou, Dietmar Straile, Rafael Marcé, Valerie McCarthy, Iveta Drastichova, Agnieszka Napiórkowska-Krzebietke, J. A. Gálvez, Tina Elersek, Beata Messyasz, Adriano Boscaini, Carmen Ferriol, Julita Dunalska, Freshwater and Marine Ecology (IBED, FNWI), BAİBÜ, Mühendislik Fakültesi, Çevre Mühendisliği Bölümü, Karakaya, Nusret, Universitat de Barcelona, Fakülteler, Fen - Edebiyat Fakültesi, Biyoloji Bölümü, Soylu, Elif Neyran, European Cooperation in Science and Technology, Université de Genève, Tokat Gaziosmanpaşa Üniversitesi, Lammi Biological Station, Doctoral Programme in Atmospheric Sciences, CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Yılmaz, Mete, Institute of Agricultural and Environmental Sciences, Mantzouki, Evanthia, Ibelings, Bastiaan Willem, Mantzouki, E, Lurling, M, Fastner, J, Domis, LD, Wilk-Wozniak, E, Koreiviene, J, Seelen, L, Teurlincx, S, Verstijnen, Y, Krzton, W, Walusiak, E, Karosiene, J, Kasperoviciene, J, Savadova, K, Vitonyte, I, Cillero-Castro, C, Budzynska, A, Goldyn, R, Kozak, A, Rosinska, J, Szelag-Wasielewska, E, Domek, P, Jakubowska-Krepska, N, Kwasizur, K, Messyasz, B, Pelechata, A, Pelechaty, M, Kokocinski, M, Garcia-Murcia, A, Real, M, Romans, E, Noguero-Ribes, J, Duque, DP, Fernandez-Moran, E, Karakaya, N, Haggqvist, K, Demir, N, Beklioglu, M, Filiz, N, Levi, EE, Iskin, U, Bezirci, G, Tavsanoglu, UN, Ozhan, K, Gkelis, S, Panou, M, Fakioglu, O, Avagianos, C, Kaloudis, T, Celik, K, Yilmaz, M, Marce, R, Catalan, N, Bravo, AG, Buck, M, Colom-Montero, W, Mustonen, K, Pierson, D, Yang, Y, Raposeiro, PM, Goncalves, V, Antoniou, MG, Tsiarta, N, McCarthy, V, Perello, VC, Feldmann, T, Laas, A, Panksep, K, Tuvikene, L, Gagala, I, Mankiewicz-Boczek, J, Yagci, MA, Cinar, S, Capkin, K, Yagci, A, Cesur, M, Bilgin, F, Bulut, C, Uysal, R, Obertegger, U, Boscaini, A, Flaim, G, Salmaso, N, Cerasino, L, Richardson, J, Visser, PM, Verspagen, JMH, Karan, T, Soylu, EN, Maraslioglu, F, Napiorkowska-Krzebietke, A, Ochocka, A, Pasztaleniec, A, Antao-Geraldes, AM, Vasconcelos, V, Morais, J, Vale, M, Koker, L, Akcaalan, R, Albay, M, Maronic, DS, Stevic, F, Pfeiffer, TZ, Fonvielle, J, Straile, D, Rothhaupt, KO, Hansson, LA, Urrutia-Cordero, P, Blaha, L, Geris, R, Frankova, M, Kocer, MAT, Alp, MT, Remec-Rekar, S, Elersek, T, Triantis, T, Zervou, SK, Hiskia, A, Haande, S, Skjelbred, B, Madrecka, B, Nemova, H, Drastichova, I, Chomova, L, Edwards, C, Sevindik, TO, Tunca, H, Onem, B, Aleksovski, B, Krstic, S, Vucelic, IB, Nawrocka, L, Salmi, P, Machado-Vieira, D, de Oliveira, AG, Delgado-Martin, J, Garcia, D, Cereijo, JL, Goma, J, Trapote, MC, Vegas-Vilarrubia, T, Obrador, B, Grabowska, M, Karpowicz, M, Chmura, D, Ubeda, B, Galvez, JA, Ozen, A, Christoffersen, KS, Warming, TP, Kobos, J, Mazur-Marzec, H, Perez-Martinez, C, Ramos-Rodriguez, E, Arvola, L, Alcaraz-Parraga, P, Toporowska, M, Pawlik-Skowronska, B, Niedzwiecki, M, Peczula, W, Leira, M, Hernandez, A, Moreno-Ostos, E, Blanco, JM, Rodriguez, V, Montes-Perez, JJ, Palomino, RL, Rodriguez-Perez, E, Carballeira, R, Camacho, A, Picazo, A, Rochera, C, Santamans, AC, Ferriol, C, Romo, S, Soria, JM, Dunalska, J, Sienska, J, Szymanski, D, Kruk, M, Kostrzewska-Szlakowska, I, Jasser, I, Zutinic, P, Udovic, MG, Plenkovic-Moraj, A, Frak, M, Bankowska-Sobczak, A, Wasilewicz, M, Ozkan, K, Maliaka, V, Kangro, K, Grossart, HP, Paerl, HW, Carey, CC, Ibelings, BW, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü, Ongun Sevindik, Tuğba, Tunca, Hatice, Hitit Üniversitesi, Fen Edebiyat Fakültesi, Biyoloji Bölümü, and Fen Edebiyat Fakültesi
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light climate ,0106 biological sciences ,thermocline ,Bacterial toxins ,toksiinit ,limit of quantitation ,Toxines bacterianes ,Microcystin-LR ,Toxicology ,01 natural sciences ,Anatoxin-a ,analogs and derivatives ,BLOOMS ,Direct Effects ,uracil ,Water Pollutants ,chemistry.chemical_classification ,Temperatures ,FRESH-WATER ,latitude ,maximum buoyancy frequency ,6. Clean water ,climate change ,Indirect effects ,EUTROPHICATION ,microcystin RR ,articles ,GROWTH ,lämpötila ,LAKES ,microcystin ,anatoxin ,cylindrospermopsin ,temperature ,direct effects ,indirect effects ,spatial distribution ,European Multi Lake Survey ,epilimnetic temperature ,ta1172 ,cyanobacteria, lakes, climate warming, microcystin ,Zoology ,Article ,water pollutant ,MICROCYSTIS-AERUGINOSA ,Alkaloids ,Settore BIO/07 - ECOLOGIA ,NATURAL SCIENCES. Biology ,Spatial distribution ,Microcystis aeruginosa ,Uracil ,lake ,syanobakteerit ,Indirect Effects ,liquid chromatography-mass spectrometry ,1172 Environmental sciences ,Ekologi ,nutrient ,010604 marine biology & hydrobiology ,lcsh:R ,microbiology ,Climatic changes ,microcystin LR ,Anatoxin ,Lakes ,Spatial Distribution ,chemistry ,nodularin ,microbial diversity ,phytoplankton ,ta1181 ,Cylindrospermopsin ,Tropanes ,Cyanobacteria ,Aquatic Ecology and Water Quality Management ,analysis ,Health, Toxicology and Mutagenesis ,lcsh:Medicine ,environmental parameters ,010501 environmental sciences ,medicine.disease_cause ,nitrogen ,chemistry.chemical_compound ,sea surface temperature ,environmental factor ,ddc:550 ,Canvi climàtic ,phosphorus ,PRIRODNE ZNANOSTI. Biologija ,limit of detection ,Ecology ,Cyanobacteria Toxins ,biology ,Temperature ,levinneisyys ,Nodularin ,tropane derivative ,Europe ,DAPHNIA-MAGNA ,İndirect Effects ,Direct effects ,microbial community ,Environmental Monitoring ,high performance liquid chromatography ,Microcystins ,Climate Change ,Bacterial Toxins ,Microcystin ,välittömät oikeusvaikutukset ,cyanobacterium ,ddc:570 ,geographic distribution ,medicine ,bacterial toxin ,controlled study ,ddc:610 ,Institut für Biochemie und Biologie ,0105 earth and related environmental sciences ,nonhuman ,WIMEK ,Toxin ,longitude ,PHYTOPLANKTON ASSEMBLAGES ,Aquatic Ecology ,NITROGEN AVAILABILITY ,anatoxin a ,Aquatische Ecologie en Waterkwaliteitsbeheer ,biology.organism_classification ,Climatic change ,CLIMATE ,13. Climate action ,response variable ,Canvis climàtics - Abstract
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains. © 2018 by the authors. Licensee MDPI, Basel, Switzerland., The authors acknowledge COST Action ES 1105 “CYANOCOST—Cyanobacterial blooms and toxins in water resources: Occurrence impacts and management” and COST Action ES 1201 “NETLAKE—Networking Lake Observatories in Europe” for contributing to this study through networking and knowledge sharing with European experts in the field. Evanthia Mantzouki was supported by a grant from the Swiss State Secretariat for Education, Research and Innovation (SERI) to Bas Ibelings and by supplementary funding from the University of Geneva. We thank Clare Ahnlund, Ena Suarez and Irene Gallego for helping out with the Swiss survey. We thank Wendy Beekman and Els J. Faassen for the nutrient and toxin analysis.
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- 2018
34. Data Descriptor: A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
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Tunca, Hatice, Mantzouki, E, Campbell, J, van Loon, E, Visser, P, Konstantinou, I, Antoniou, M, Giuliani, G, Machado-Vieira, D, de Oliveira, AG, Maronic, DS, Stevic, F, Pfeiffer, TZ, Vucelic, IB, Zutinic, P, Udovic, MG, Plenkovic-Moraj, A, Tsiarta, N, Blaha, L, Geris, R, Frankova, M, Christoffersen, KS, Warming, TP, Feldmann, T, Laas, A, Panksep, K, Tuvikene, L, Kangro, K, Haggqvist, K, Salmi, P, Arvola, L, Fastner, J, Straile, D, Rothhaupt, KO, Fonvielle, J, Grossart, HP, Avagianos, C, Kaloudis, T, Triantis, T, Zervou, SK, Hiskia, A, Gkelis, S, Panou, M, McCarthy, V, Perello, VC, Obertegger, U, Boscaini, A, Flaim, G, Salmaso, N, Cerasino, L, Koreiviene, J, Karosiene, J, Kasperoviciene, J, Savadova, K, Vitonyte, I, Haande, S, Skjelbred, B, Grabowska, M, Karpowicz, M, Chmura, D, Nawrocka, L, Kobos, J, Mazur-Marzec, H, Alcaraz-Parraga, P, Wilk-Wozniak, E, Krzton, W, Walusiak, E, Gagala, I, Mankiewicz-Boczek, J, Toporowska, M, Pawlik-Skowronska, B, Niedzwiecki, M, Peczula, W, Napiorkowska-Krzebietke, A, Dunalska, J, Sienska, J, Szymanski, D, Kruk, M, Budzynska, A, Goldyn, R, Kozak, A, Rosinska, J, Szelag-Wasielewska, E, Domek, P, Jakubowska-Krepska, N, Kwasizur, K, Messyasz, B, Pelechata, A, Pelechaty, M, Kokocinski, M, Madrecka, B, Kostrzewska-Szlakowska, I, Frak, M, Bankowska-Sobczak, A, Wasilewicz, M, Ochocka, A, Pasztaleniec, A, Jasser, I, Antao-Geraldes, AM, Leira, M, Hernandez, A, Vasconcelos, V, Morais, J, Vale, M, Raposeiro, PM, Goncalves, V, Aleksovski, B, Krstic, S, Nemova, H, Drastichova, I, Chomova, L, Remec-Rekar, S, Elersek, T, Delgado-Martin, J, Garcia, D, Cereijo, JL, Goma, J, Trapote, MC, Vegas-Vilarrubia, T, Obrador, B, Garcia-Murcia, A, Real, M, Romans, E, Noguero-Ribes, J, Duque, DP, Fernandez-Moran, E, Ubeda, B, Galvez, JA, Marce, R, Catalan, N, Perez-Martinez, C, Ramos-Rodriguez, E, Cillero-Castro, C, Moreno-Ostos, E, Blanco, JM, Rodriguez, V, Montes-Perez, JJ, Palomino, RL, Rodriguez-Perez, E, Carballeira, R, Camacho, A, Picazo, A, Rochera, C, Santamans, AC, Ferriol, C, Romo, S, Soria, JM, Hansson, LA, Urrutia-Cordero, P, Ozen, A, Bravo, AG, Buck, M, Colom-Montero, W, Mustonen, K, Pierson, D, Yang, Y, Verspagen, JMH, Domis, LND, Seelen, L, Teurlincx, S, Verstijnen, Y, Lurling, M, Maliaka, V, Faassen, EJ, Latour, D, Carey, CC, Paerl, HW, Torokne, A, Karan, T, Demir, N, Beklioglu, M, Filiz, N, Levi, EE, Iskin, U, Bezirci, G, Tavsanoglu, UN, Celik, K, Ozhan, K, Karakaya, N, Kocer, MAT, Yilmaz, M, Maraslioglu, F, Fakioglu, O, Soylu, EN, Yagci, MA, Cinar, S, Capkin, K, Yagci, A, Cesur, M, Bilgin, F, Bulut, C, Uysal, R, Koker, L, Akcaalan, R, Albay, M, Alp, MT, Ozkan, K, Sevindik, TO, Tunca, H, Onem, B, Richardson, J, Edwards, C, Bergkemper, V, O'Leary, S, Beirne, E, Cromie, H, Ibelings, BW, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Biyoloji Bölümü, and Tunca, Hatice
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Science & Technology - Other Topics - Abstract
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.
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- 2018
35. Quality matters: Response of bacteria and ciliates to different allochthonous dissolved organic matter sources as a pulsed disturbance in shallow lakes.
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Yalçın G, Yıldız D, Calderó-Pascual M, Yetim S, Şahin Y, Parakatselaki ME, Avcı F, Karakaya N, Ladoukakis ED, Berger SA, Ger KA, Jeppesen E, and Beklioğlu M
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- Animals, Dissolved Organic Matter, Bacteria, Biomass, Plankton, Ecosystem, Lakes microbiology
- Abstract
Shallow lake ecosystems are particularly prone to disturbances such as pulsed dissolved organic matter (allochthonous-DOM; hereafter allo-DOM) loadings from catchments. However, the effects of allo-DOM with contrasting quality (in addition to quantity) on the planktonic communities of microbial loop are poorly understood. To determine the impact of different qualities of pulsed allo-DOM disturbance on the coupling between bacteria and ciliates, we conducted a mesocosm experiment with two different allo-DOM sources added to mesocosms in a single-pulse disturbance event: Alder tree leaf extract, a more labile (L) source and HuminFeed® (HF), a more recalcitrant source. Allo-DOM sources were used as separate treatments and in combination (HFL) relative to the control without allo-DOM additions (C). Our results indicate that the quality of allo-DOM was a major regulator of planktonic microbial community biomass and/or composition through which both bottom-up and top-down forces were involved. Bacteria biomass showed significant nonlinear responses in L and HFL with initial increases followed by decreases to pre-pulse conditions. Ciliate biomass was significantly higher in L compared to all other treatments. In terms of composition, bacterivore ciliate abundance was significantly higher in both L and HFL treatments, mainly driven by the bacterial biomass increase in the same treatments. GAMM models showed negative interaction between metazoan zooplankton biomass and ciliates, but only in the L treatment, indicating top-down control on ciliates. Ecosystem stability analyses revealed overperformance, high resilience and full recovery of bacteria in the HFL and L treatments, while ciliates showed significant shift in compositional stability in HFL and L with incomplete taxonomic recovery. Our study highlights the importance of allo-DOM quality shaping the response within the microbial loop not only through triggering different scenarios in biomass, but also the community composition, stability, and species interactions (top-down and bottom-up) in bacteria and plankton., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)
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- 2024
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36. A hidden burden of disease in a specific group: Evaluation of COVID-19 seroconversion rates in pediatric patients with leukemia.
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Yılmaz Çelebi M, Şahinkaya Ş, Cem E, Akaslan Kara A, Özdağ E, Ayhan FY, Karakaya N, Odaman Al I, Gözmen S, Hilkay Karapınar T, Oymak Y, Bayram SN, and Devrim İ
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- Male, Female, Humans, Child, Child, Preschool, SARS-CoV-2, Seroconversion, Prospective Studies, Antibodies, Viral, Cost of Illness, COVID-19, Leukemia complications
- Abstract
Background: SARS-CoV-2, a respiratory viral disease, is thought to have a more severe course in patients with malignancy and low immune systems., Methods: This prospective single-center study was conducted at the University of Health Sciences Dr Behçet Uz Children's Hospital from September 22 to December 31, 2021. Asymptomatic COVID-19 transmission rates were assessed using SARS-CoV-2 serology in patients with leukemia who had no history of COVID-19 infection., Results: Among the 54 patients, 19 (35.2%) were females and 35 (64.8%) were males. The median age was 5.5 years (min 6 months, max 17 years). Forty-nine (90.5%) of the leukemia patients had acute lymphoblastic leukemia, while 5 (9.5%) had acute myeloid leukemia. Five of the 54 patients had a history of COVID-19 or contact with a positive person. SARS-CoV-2 IgG positivity was detected in 18 (36.7%) of 49 patients with no history of COVID-19 infection., Discussion: Leukemia patients have a high seroconversion for SARS-CoV-2 without showing any symptoms supporting the asymptomatic course of COVID-19 infection in this risk group., Conclusion: As a result, patients with leukemia may have a high rate of COVID-19 seroconversion without showing symptoms., (Copyright © 2023 Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved.)
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- 2024
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37. Improved Heat Dissipation of NR/SBR-Based Tire Tread Compounds via Hybrid Fillers of Multi-Walled Carbon Nanotube and Carbon Black.
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Kodal M, Yazıcı Çakır N, Yıldırım R, Karakaya N, and Özkoç G
- Abstract
The development of thermally conductive rubber nanocomposites for heat management poses a formidable challenge in numerous applications, notably within the realm of tire technology. Notably, rubber materials are characterized by their inherently low thermal conductivity. Consequently, it becomes imperative to incorporate diverse conductive fillers to mitigate the propensity for heat build-up. Multi-walled carbon nanotubes (MWCNTs), as reinforcement agents within the tire tread compounds, have gained considerable attention owing to their extraordinary attributes. The attainment of high-performance rubber nanocomposites hinges significantly on the uniform distribution of MWCNT. This study presents the influence of MWCNTs on the performance of carbon black (CB)-reinforced natural rubber (NR)/styrene butadiene rubber (SBR) tire compounds prepared via high shear melt mixing. Morphological analysis showed a good distribution of MWCNTs in the NR/SBR/CB compound. The vulcanization parameters, such as the maximum and minimum torque, cross-linking density, hardness, abrasion resistance, tensile strength, and Young modulus, exhibited a progressive improvement with the addition of MWCNT. Remarkably, adding MWCNT into CB improved the heat conductivity of the NR/SBR/CB compounds, hence decreasing the heat build-up. A percolation mode was also proposed for the hybrid carbon fillers based on the data obtained.
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- 2023
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38. The evaluation of Candida-related central line-related bloodstream infections in pediatric cancer patients: A pre- and post-intervention study.
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Devrim İ, Celebi MY, Karakaya N, Sahinkaya S, Acar SO, Cem E, Demirağ B, Oruc Y, Kara AA, Oymak Y, Karapınar TH, and Bayram N
- Abstract
Aim/objections: The purpose of this study was to assess the efficacy of a central line maintenance bundle in preventing catheter-related (implanted venous access devices, port) Candida bloodstream infections., Methods: The study encompassed two distinct time periods, namely, pre-bundle and bundle. The number of catheter-related bloodstream infections (CRBSI) episodes per catheter days for each timeframe was determined., Findings/results: Upon implementation of the central line bundle, the rate of CRBSI reduced significantly from 4.27 per 1000 central line days in the pre-bundle period to 1.0 per 1000 central line days in the bundle period ( p < .001)., Discussion: Using a central line bundle to avoid CRBSIs in pediatric cancer patients with ports led to a significant decrease in Candida species-related CRBSIs., Competing Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2023.)
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- 2023
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39. Effective removal of selected pharmaceuticals from sewerage treatment plant effluent using natural clay (Na-montmorillonite).
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Aydin S, Celik Karakaya M, Karakaya N, and Aydin ME
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The consumption of pharmaceuticals has rapidly increased on a global scale due to the serious increase in Covid-19, influenza and respiratuar sinsityal virus, which is called "triple epidemic" in the world. The use of non-prescription analgesic and anti-inflammatory drugs (AAIDs), especially paracetamol, is higher compared to pre-pandemic. This increased the AAIDs load discharged to the aqueous media through sewerage treatment plant (STP). Therefore, simple and effective treatment options for removing AAIDs from STP effluents are needed. The aim of the study was to remove AAIDs (paracetamol, acetylsalicylic acid, codeine, diclofenac, ibuprofen, indomethacin, ketoprofen, mefenamic acid, naproxen, and phenylbutazone) from STP effluents by nearly pure natural clay Na-montmorillonite. The Na-montmorillonite taken from the Ordu region in the northern part of Turkey. Surface area of the Na-montmorillonite is 99.58 m
2 /g and CEC is 92.40 meq/100 g. The removal efficiencies of AAIDs using Na-montmorillonite were between 82 ± 5% (ibuprofen) and 94 ± 4% (naproxen). Paracetamol was used as a model compound in kinetic and isotherm model studies. Freundlich isotherm model and the pseudo second order kinetic model were the best-fit using the obtained experimental data. Film diffusion governed its rate mechanism. The paracetamol adsorption capacity was acquired as 244 mg/g at 120 min contact time at pH 6.5 at 25 °C. With this study, it could be shown that montmorillonite can be used effectively to eliminate paracetamol from STP effluent. Natural clay can be used as a simple, inexpensive and effective adsorbent for removing AAIDs from STP effluents., Supplementary Information: The online version contains supplementary material available at 10.1007/s13201-023-01930-5., Competing Interests: Conflict of interestThe authors have no competing interests to declare that are relevant to the content of this article. On behalf of all authors, the corresponding author states that there is no conflict of interest., (© The Author(s) 2023.)- Published
- 2023
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40. A Neonatal Case of Infantile Malignant Osteopetrosis Presenting with Thrombocytopenia and Hypotonicity: A Novel Mutation in Chloride Voltage-Gated Channel 7 Gene.
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Odaman Al I, Oymak Y, Hazan F, Gursoy S, Ozturk T, Bag O, Gozmen S, Karakaya N, and Karapinar TH
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Autosomal recessive osteopetrosis is also known as infantile malignant osteopetrosis (IMO). The clinical course is often serious and if left untreated, it is fatal in the 1st year of life. Diagnosis is challenging and often delayed or misdiagnosed. Herein, we present an infant girl who was diagnosed with IMO during evaluations for her hypotonicity and thrombocytopenia. A novel mutation of the chloride voltage-gated channel 7 (CLCN7) gene was also reported. A 10-day-old female patient was referred to our hospital for evaluation of hypotonicity. Her physical examination was normal, other than hypotonicity. Laboratory analysis revealed thrombocytopenia and hypocalcemia. In the progress, while she was followed in outpatient clinic, hepatosplenomegaly was detected at the age of 3 months. IMO was suspected with the findings of hepatosplenomegaly, cytopenia, hypocalcemia, difficulty of obtaining bone marrow, peripheral smear findings, and hearing loss. The X-ray of the bones was consistent with IMO. A novel pathogenic homozygous c.1504>T (p.Arg502Trp) mutation in CLCN7 gene was revealed. IMO is a rare disorder and it is important to differentiate this entity for better clinical outcome. The presence of neurological and hematological findings, organomegaly, hearing loss, and vision disorders must attract attention to IMO., (©Copyright 2022 by The Medical Bulletin of Sisli Etfal Hospital - Available online at www.sislietfaltip.org.)
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- 2022
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41. Comparison of an inactivated Covid19 vaccine-induced antibody response with concurrent natural Covid19 infection.
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Azak E, Karadenizli A, Uzuner H, Karakaya N, Canturk NZ, and Hulagu S
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- Antibodies, Viral, Antibody Formation, Humans, SARS-CoV-2, Vaccines, Inactivated, COVID-19, COVID-19 Vaccines
- Abstract
Objectives: The risk of contracting SARS-CoV-2 is high among the health care workers (HCW). The comparison between the antibody response to an inactivated Covid19 vaccine and the antibodies that developed during Covid-19 infection has not been elucidated. In this study, vaccine-induced antibody levels were compared with the antibodies developed in naturally infected HCWs., Methods: Eighty vaccinated individuals and 80 Covid-19 patients enrolled to the study. Both groups were matched on age, gender and antibody testing time. Anti-SARS-CoV-2 total Ig (Roche) and Anti-SARS-CoV-2 ELISA (IgG) (Euroimmun, Germany) were used to detect antibodies., Results: The anti-S positivity were determined to be 96.2% and 92.5% in vaccinated and patient groups (p=0.303) while the anti-N positivity was 51.2% and 98.8%, respectively (p=<0,0001). The median values for anti-S and anti-N antibodies were statistically significant between both groups. When the vaccinated group was compared with the severe and non-severe patient groups, statistically significant differences were found for both regarding anti-S1 and anti-N antibody titers (p=0,012, p=<0,0001, respectively). For the patient group, there was a positive correlation between the age and anti-S1 antibody titers (r=0.333; p=0.003) and there was also a statistically significant increase in anti-N antibody titers in time (r=0.505; p=0.0001)., Conclusion: The anti-S seroconversion ratio in vaccinated individuals were higher than what was reported by the vaccine manufacturer. The antibody titers in the vaccinated group were lower than the patients group. The decrease in anti-S1 antibody titers in time were considered to be a disadvantage and an undesired phenomenon., (Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2021
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42. Utility of a source-related matrix in basin management studies: a practice on a sub-Basin in Turkey.
- Author
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Hanedar A, Tanik A, Girgin E, Güneş E, Karakaya N, Gorgun E, Gökdereli G, Çankaya BF, Kimence T, Karaaslan Y, and Dikmen B
- Subjects
- Rivers, Turkey, Water Quality, Environmental Monitoring, Water Pollutants, Chemical analysis
- Abstract
According to the water framework directive (WFD), the chemical status should be determined for each water body in a basin through monitoring and evaluation studies, and the gap between the status of water bodies and good water status should be revealed in river basin management plans. In this context, the methodology starting with the evaluation of the monitoring results of the priority substances (PSs) until the end of determining the measures to achieve good condition in surface waters was given in this study. The key aim was to provide a useful methodology defined as a matrix for determining the sources of pollutants that caused this gap. This matrix was applied to the most polluted sub-basin of Küçük Menderes Basin located on the western part of the Turkey. Monitoring studies were carried out in 21 water bodies for a 1-year period for 45 PSs and monitoring results were compared with environmental quality standards (EQS). It was determined that 13 of 45 PSs in 15 water bodies exceeded the EQS. The common PSs in the basin were lead, nickel, fluoranthene, benzo(a)pyrene, C10-13 chloroalkanes, and 4-nonylphenols and average rates of exceeding the EQS were 58.3%, 36.4%, 91.5%, 99.9%, 74.8%, and 49.4%, respectively. The detailed emission inventory of each water body in the basin has been made. Potential sources of PSs were searched via the matrix formed and a total number of 420 basic and supplementary measures were proposed to improve the water quality of the sub-basin., (© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2021
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43. Interaction effects of the main drivers of global climate change on spatiotemporal dynamics of high altitude ecosystem behaviors: process-based modeling.
- Author
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Yildiz K, Karakaya N, Kilic S, and Evrendilek F
- Subjects
- Altitude, Carbon analysis, Environmental Monitoring, Soil, Climate Change, Ecosystem
- Abstract
Soil organic carbon and nitrogen (SOC-N) dynamics are indicative of the human-induced disturbances of the terrestrial ecosystems the quantification of which provides insights into interactions among drivers, pressures, states, impacts, and responses in a changing environment. In this study, a process-based model was developed to simulate the eight monthly outputs of net primary productivity (NPP), SOC-N pools, soil C:N ratio, soil respiration, total N emission, and sediment C-N transport effluxes for cropland, grassland, and forest on a hectare basis. The interaction effect of the climate change drivers of aridity, CO
2 fertilization, land-use and land-cover change, and best management practices was simulated on high altitude ecosystems from 2018 to 2070. The best management practices were developed into a spatiotemporally composite index based on SOC-N stock saturation, 4/1000 initiative, and RUCLE-C factor. Our model predictions differed from the remotely sensed data in the range of - 64% (underestimation) for the cropland NPP to 142% (overestimation) for the grassland SOC pool as well as from the global mean values in the range of - 97% for the sediment C and N effluxes to 60% for the total N emission from the grassland. The interaction exerted the greatest negative impact on the monthly sediment N efflux, total N emission, and soil respiration from forest by - 90.5, - 82.7, and - 80.3% and the greatest positive impact on the monthly sediment C effluxes from cropland, grassland, and forest by 139.3, 137.1, and 133.3%, respectively, relative to the currently prevailing conditions.- Published
- 2020
- Full Text
- View/download PDF
44. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins.
- Author
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Mantzouki E, Campbell J, van Loon E, Visser P, Konstantinou I, Antoniou M, Giuliani G, Machado-Vieira D, Gurjão de Oliveira A, Maronić DŠ, Stević F, Pfeiffer TŽ, Vucelić IB, Žutinić P, Udovič MG, Plenković-Moraj A, Tsiarta N, Bláha L, Geriš R, Fránková M, Christoffersen KS, Warming TP, Feldmann T, Laas A, Panksep K, Tuvikene L, Kangro K, Häggqvist K, Salmi P, Arvola L, Fastner J, Straile D, Rothhaupt KO, Fonvielle J, Grossart HP, Avagianos C, Kaloudis T, Triantis T, Zervou SK, Hiskia A, Gkelis S, Panou M, McCarthy V, Perello VC, Obertegger U, Boscaini A, Flaim G, Salmaso N, Cerasino L, Koreivienė J, Karosienė J, Kasperovičienė J, Savadova K, Vitonytė I, Haande S, Skjelbred B, Grabowska M, Karpowicz M, Chmura D, Nawrocka L, Kobos J, Mazur-Marzec H, Alcaraz-Párraga P, Wilk-Woźniak E, Krztoń W, Walusiak E, Gagala I, Mankiewicz-Boczek J, Toporowska M, Pawlik-Skowronska B, Niedźwiecki M, Pęczuła W, Napiórkowska-Krzebietke A, Dunalska J, Sieńska J, Szymański D, Kruk M, Budzyńska A, Goldyn R, Kozak A, Rosińska J, Szeląg-Wasielewska E, Domek P, Jakubowska-Krepska N, Kwasizur K, Messyasz B, Pełechata A, Pełechaty M, Kokocinski M, Madrecka B, Kostrzewska-Szlakowska I, Frąk M, Bańkowska-Sobczak A, Wasilewicz M, Ochocka A, Pasztaleniec A, Jasser I, Antão-Geraldes AM, Leira M, Hernández A, Vasconcelos V, Morais J, Vale M, Raposeiro PM, Gonçalves V, Aleksovski B, Krstić S, Nemova H, Drastichova I, Chomova L, Remec-Rekar S, Elersek T, Delgado-Martín J, García D, Cereijo JL, Gomà J, Trapote MC, Vegas-Vilarrúbia T, Obrador B, García-Murcia A, Real M, Romans E, Noguero-Ribes J, Duque DP, Fernández-Morán E, Úbeda B, Gálvez JÁ, Marcé R, Catalán N, Pérez-Martínez C, Ramos-Rodríguez E, Cillero-Castro C, Moreno-Ostos E, Blanco JM, Rodríguez V, Montes-Pérez JJ, Palomino RL, Rodríguez-Pérez E, Carballeira R, Camacho A, Picazo A, Rochera C, Santamans AC, Ferriol C, Romo S, Soria JM, Hansson LA, Urrutia-Cordero P, Özen A, Bravo AG, Buck M, Colom-Montero W, Mustonen K, Pierson D, Yang Y, M H Verspagen J, de Senerpont Domis LN, Seelen L, Teurlincx S, Verstijnen Y, Lürling M, Maliaka V, Faassen EJ, Latour D, Carey CC, W Paerl H, Torokne A, Karan T, Demir N, Beklioğlu M, Filiz N, E Levi E, Iskin U, Bezirci G, Tavşanoğlu ÜN, Çelik K, Özhan K, Karakaya N, Koçer MAT, Yilmaz M, Maraşlıoğlu F, Fakioglu Ö, Soylu EN, Yağcı MA, Çınar Ş, Çapkın K, Yağcı A, Cesur M, Bilgin F, Bulut C, Uysal R, Köker L, Akçaalan R, Albay M, Alp MT, Özkan K, Sevindik TO, Tunca H, Önem B, Richardson J, Edwards C, Bergkemper V, O'Leary S, Beirne E, Cromie H, and Ibelings BW
- Subjects
- Climate Change, Europe, Phytoplankton chemistry, Pigments, Biological, Cyanobacteria chemistry, Environmental Monitoring, Lakes
- Abstract
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment.
- Published
- 2018
- Full Text
- View/download PDF
45. Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins.
- Author
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Mantzouki E, Lürling M, Fastner J, de Senerpont Domis L, Wilk-Woźniak E, Koreivienė J, Seelen L, Teurlincx S, Verstijnen Y, Krztoń W, Walusiak E, Karosienė J, Kasperovičienė J, Savadova K, Vitonytė I, Cillero-Castro C, Budzyńska A, Goldyn R, Kozak A, Rosińska J, Szeląg-Wasielewska E, Domek P, Jakubowska-Krepska N, Kwasizur K, Messyasz B, Pełechaty A, Pełechaty M, Kokocinski M, García-Murcia A, Real M, Romans E, Noguero-Ribes J, Duque DP, Fernández-Morán E, Karakaya N, Häggqvist K, Demir N, Beklioğlu M, Filiz N, Levi EE, Iskin U, Bezirci G, Tavşanoğlu ÜN, Özhan K, Gkelis S, Panou M, Fakioglu Ö, Avagianos C, Kaloudis T, Çelik K, Yilmaz M, Marcé R, Catalán N, Bravo AG, Buck M, Colom-Montero W, Mustonen K, Pierson D, Yang Y, Raposeiro PM, Gonçalves V, Antoniou MG, Tsiarta N, McCarthy V, Perello VC, Feldmann T, Laas A, Panksep K, Tuvikene L, Gagala I, Mankiewicz-Boczek J, Yağcı MA, Çınar Ş, Çapkın K, Yağcı A, Cesur M, Bilgin F, Bulut C, Uysal R, Obertegger U, Boscaini A, Flaim G, Salmaso N, Cerasino L, Richardson J, Visser PM, Verspagen JMH, Karan T, Soylu EN, Maraşlıoğlu F, Napiórkowska-Krzebietke A, Ochocka A, Pasztaleniec A, Antão-Geraldes AM, Vasconcelos V, Morais J, Vale M, Köker L, Akçaalan R, Albay M, Špoljarić Maronić D, Stević F, Žuna Pfeiffer T, Fonvielle J, Straile D, Rothhaupt KO, Hansson LA, Urrutia-Cordero P, Bláha L, Geriš R, Fránková M, Koçer MAT, Alp MT, Remec-Rekar S, Elersek T, Triantis T, Zervou SK, Hiskia A, Haande S, Skjelbred B, Madrecka B, Nemova H, Drastichova I, Chomova L, Edwards C, Sevindik TO, Tunca H, Önem B, Aleksovski B, Krstić S, Vucelić IB, Nawrocka L, Salmi P, Machado-Vieira D, de Oliveira AG, Delgado-Martín J, García D, Cereijo JL, Gomà J, Trapote MC, Vegas-Vilarrúbia T, Obrador B, Grabowska M, Karpowicz M, Chmura D, Úbeda B, Gálvez JÁ, Özen A, Christoffersen KS, Warming TP, Kobos J, Mazur-Marzec H, Pérez-Martínez C, Ramos-Rodríguez E, Arvola L, Alcaraz-Párraga P, Toporowska M, Pawlik-Skowronska B, Niedźwiecki M, Pęczuła W, Leira M, Hernández A, Moreno-Ostos E, Blanco JM, Rodríguez V, Montes-Pérez JJ, Palomino RL, Rodríguez-Pérez E, Carballeira R, Camacho A, Picazo A, Rochera C, Santamans AC, Ferriol C, Romo S, Soria JM, Dunalska J, Sieńska J, Szymański D, Kruk M, Kostrzewska-Szlakowska I, Jasser I, Žutinić P, Gligora Udovič M, Plenković-Moraj A, Frąk M, Bańkowska-Sobczak A, Wasilewicz M, Özkan K, Maliaka V, Kangro K, Grossart HP, Paerl HW, Carey CC, and Ibelings BW
- Subjects
- Alkaloids, Climate Change, Cyanobacteria Toxins, Environmental Monitoring, Europe, Temperature, Uracil analysis, Bacterial Toxins analysis, Cyanobacteria, Lakes microbiology, Microcystins analysis, Tropanes analysis, Uracil analogs & derivatives, Water Pollutants analysis
- Abstract
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains., Competing Interests: The authors declare no conflict of interest.
- Published
- 2018
- Full Text
- View/download PDF
46. Radioactivity and hydrochemical properties of certain thermal Turkish spa waters.
- Author
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Karakaya MÇ, Doğru M, Karakaya N, Kuluöztürk F, and Nalbantçılar MT
- Subjects
- Baths, Environmental Monitoring, Radiation Monitoring, Spectrometry, Gamma, Turkey, Mineral Waters analysis, Radioisotopes analysis, Water Pollutants, Radioactive analysis
- Abstract
The study aims to determine the radioactivity levels of thermal waters which have been used seasonally or permanently in spas for therapeutic intentions. Samples were collected from spas in different regions of Turkey. Some radionuclides (
40 K,232 Th,226 Ra,137 Cs), gross alpha (GA) and gross beta (GB) activities, and physical and some chemical parameters were measured. Gamma radiation measurements for226 Ra,232 Th and40 K radionuclides were performed by using a high purity germanium (HPGe) detector. The results of the gamma spectrometry ranged from 1.385 to 11.025 Bql-1 for226 Ra,-1 for 232 Th and 9.679 to 36.989 Bql-1 for40 K. GA and GB activity concentrations were detected by using ultra-low level α/β counter. The GA and GB activity ranged from 43 to 3,182 mBql-1 and 54 to 1,950 mBql-1 , respectively. Based on calculated annual effective dose equivalent, the total dose originated mostly from226 Ra and slightly from40 K. Furthermore, waters with high Cl content were enriched with40 K,226 Ra isotopes, and the source of GA and GB activity in these waters was mostly226 Ra. Strong high positive correlation between Cl,226 Ra and total dissolved solids in Cl-enriched samples indicated that the nuclides formed from dissolved minerals in these waters.- Published
- 2017
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47. Large interannual variability in net ecosystem carbon dioxide exchange of a disturbed temperate peatland.
- Author
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Aslan-Sungur G, Lee X, Evrendilek F, and Karakaya N
- Abstract
Peatland ecosystems play an important role in the global carbon (C) cycle as significant C sinks. However, human-induced disturbances can turn these sinks into sources of atmospheric CO2. Long-term measurements are needed to understand seasonal and interannual variability of net ecosystem CO2 exchange (NEE) and effects of hydrological conditions and their disturbances on C fluxes. Continuous eddy-covariance measurements of NEE were conducted between August 2010 and April 2014 at Yenicaga temperate peatland (Turkey), which was drained for agricultural usage and for peat mining until 2009. Annual NEE during the three full years of measurement indicated that the peatland acted as a CO2 source with large interannual variability, at rates of 246, 244 and 663 g Cm(-2)yr(-1) for 2011, 2012, and 2013 respectively, except for June 2011, and May to July 2012. The emission strengths were comparable to those found for severely disturbed tropical peatlands. The peak CO2 emissions occurred in the dry summer of 2013 when water table level (WTL) was below a threshold value of -60 cm and soil water content (SCW) below a threshold value of 70% by volume. Water availability index was found to have a stronger explanatory power for variations in monthly ecosystem respiration (ER) than the traditional water status indicators (SCW and WTL). Air temperature, evapotranspiration and vapor pressure deficient were the most significant variables strongly correlated with NEE and its component fluxes of gross primary production and ER., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
48. Evaluating the impact of climate change on groundwater resources in a small Mediterranean watershed.
- Author
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Ertürk A, Ekdal A, Gürel M, Karakaya N, Guzel C, and Gönenç E
- Subjects
- Environmental Monitoring, Turkey, Climate Change, Groundwater analysis, Water Resources statistics & numerical data, Water Supply statistics & numerical data
- Abstract
Western Mediterranean Region of Turkey is subject to considerable impacts of climate change that may adversely affect the water resources. Decrease in annual precipitation and winter precipitation as well as increase in temperatures are observed since 1960s. In this study, the impact of climate change on groundwater resources in part of Köyceğiz-Dalyan Watershed was evaluated. Evaluation was done by quantifying the impacts of climate change on the water budget components. Hydrological modeling was conducted with SWAT model which was calibrated and validated successfully. Climate change and land use scenarios were used to calculate the present and future climate change impacts on water budgets. According to the simulation results, almost all water budget components have decreased. SWAT was able to allocate less irrigation water because of the decrease of overall water due to the climate change. This resulted in an increase of water stressed days and temperature stressed days whereas crop yields have decreased according to the simulation results. The results indicated that lack of water is expected to be a problem in the future. In this manner, investigations on switching to more efficient irrigation methods and to crops with less water consumption are recommended as adaptation measures to climate change impacts., (Copyright © 2014 Elsevier B.V. All rights reserved.)
- Published
- 2014
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- View/download PDF
49. Monitoring diel dissolved oxygen dynamics through integrating wavelet denoising and temporal neural networks.
- Author
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Evrendilek F and Karakaya N
- Subjects
- Algorithms, Lakes chemistry, Oxygen chemistry, Water Pollution, Chemical statistics & numerical data, Environmental Monitoring methods, Neural Networks, Computer, Oxygen analysis, Water Pollutants, Chemical analysis
- Abstract
Diel dissolved oxygen (DO) time series measured continuously using proximal sensors in situ for a temperate lake were denoised using discrete wavelet transform (DWT) with the orthogonal wavelet families of coiflet, daubechies, and symmlet with order of 10. Diel DO time series denoised were modeled using nine temporal artificial neural networks (ANNs) as a function of water level, water temperature, electrical conductivity, pH, day of year, and hour. Our results showed that time-lag recurrent network (TLRN) using denoised data emulated diel DO dynamics better than the best-performing TLRN using the original data, time-delay neural network (TDNN), and recurrent network (RNN). Daubechies basis dealt with diel DO data slightly better than the other bases given its coefficient of determination (r (2) = 87.1 %), while symmlet performed slightly better than the other bases in terms of root mean square error (RMSE = 1.2 ppm) and mean absolute error (MAE = 0.9 ppm).
- Published
- 2014
- Full Text
- View/download PDF
50. Monitoring spatiotemporal variations of diel radon concentrations in peatland and forest ecosystems based on neural network and regression models.
- Author
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Evrendilek F, Denizli H, Yetis H, and Karakaya N
- Subjects
- Models, Chemical, Models, Statistical, Neural Networks, Computer, Regression Analysis, Spatio-Temporal Analysis, Sphagnopsida, Trees, Turkey, Air Pollutants, Radioactive analysis, Air Pollution, Radioactive statistics & numerical data, Ecosystem, Radiation Monitoring methods, Radon analysis
- Abstract
Concentrations of outdoor radon-222 ((222)Rn) in temperate grazed peatland and deciduous forest in northwestern Turkey were measured, compared, and modeled using artificial neural networks (ANNs) and multiple nonlinear regression (MNLR) models. The best-performing multilayer perceptron model selected out of 28 ANNs considerably enhanced accuracy metrics in emulating (222)Rn concentrations relative to the MNLR model. The two ecosystems had similar diel patterns with the lowest (222)Rn concentrations in the afternoon and the highest ones near dawn. Mean level (5.1 + 2.5 Bq m(-3) h(-1)) of (222)Rn in the forest was three times smaller than that (15.8 + 9.7 Bq m(-3)) of (222)Rn in the peatland. Mean (222)Rn level had negative and positive relationships with air temperature and relative humidity, respectively.
- Published
- 2013
- Full Text
- View/download PDF
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