Yayınlar
Koleksiyondaki öğeler
- MakaleYalnız künye2018Scopus SJRQ3Holographic reconstruction of scalar fields in extended Kaluza Klein cosmology
Korunur, Murat
In recent years, many studies have been conducted to reconstruct the physical properties of scalar fields by establishing a connection between some energy densities and a scalar field of dark energies. In this paper, using the extended five-dimensional (5D) Kaluza- Klein model, we establish a correspondence among modified holographic dark energy and the tachyon, K-essence and dilaton scalar-field models. We also graphically illustrate the evolution of the equation-of-state parameter versus time.
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İncele - MakaleYalnız künye2020A RESEARCH FOR BACTERIAL SELF-HEALING IN METAKAOLIN BASED GEOPOLYMER MORTARS
Yilmazer Polat, Berivan; Uysal, Mucteba; Korkmaz, Volkan
Cement production is a polluting process for nature. For this reason, new types of concrete which can be produced with recycled materials and without cement continue to be investigated. On the other hand; cracks in structural elements reduce the strength and durability of a building. Extending service life of buildings has eliminated the cost of rebuilding and thus, contributed to both the economy and the ecosystem. Due to this, research on crack healing in Portland cement concretes with various bacteria is continuing for some time. However, there are not enough studies in literature regarding the improvement of metakaolin-based geopolymer mortars produced without using cement by urolytic bacteria. The parameters of temperature, pH and void ratio of bacterial geopolymer mortar affect the viability of bacteria. For example, pH value of the medium required for the survival of bacteria is, generally around nine. During the production of geopolymer concrete, a sudden increase in high alkali environment occurs due to use of activators. This reduces the survival rate of bacteria added to the mixture during the production of geopolymer mortar. In this study, the most suitable environment for geopolymer mortar, and the conditions for the bacteria to survive until the end of the curing process for the mortar to be strengthened were investigated. Analyses on the effects of urolytic bacteria and geopolymer mortar healing process on mechanical strength of the mortar were conducted. Sporosarcina Pasteurii were used for the self healing process. Various mixtures of geopolymer mortars were cured under different environmental conditions to observe changes in their mechanical strength and water absorption capacity. As the result of the study, the most suitable mixture ratio and curing medium were identified. It was observed that the nutrient, ensuring the life cycle of the urolytic bacteria, had no negative effect on the mechanical strength of mortar and reduced capillary water absorption of the mortar. This study is a specific text in the literature that analyzes bacterial curing conditions and the effect of improving geopolymer mortar.
AtıfScopus14İncele - MakaleYalnız künye2020Scopus SJRQ2A multi-method patient arrival forecasting outline for hospital emergency departments
Yucesan, Melih; Gul, Muhammet; Celik, Erkan
Patient arrivals at the emergency department (ED) of hospitals has an unpredictable behavior. So that, adequate forecasting of this process can serve a management baseline to better allocate ED human resources and medical equipment. In this paper, a multi-method patient arrival forecasting outline for EDs is developed. The methods followed within this study include single methods as linear regression (LR), autoregressive integrated moving average (ARIMA), artificial neural network (ANN), exponential smoothing and hybrid methods as ARIMA–ANN and ARIMA-LR. As the subject of the study, a private hospital ED case in Turkey is carried out. Data of ED patient arrivals for the year of 2016 was used to set up models. Forecasting performance of the multi-method outline was measured using mean absolute percentage error. The ARIMA–ANN hybrid model is shown to outperform in terms of forecasting accuracy. In order to contribute to the current knowledge, this paper is a novel attempt of applying these methods to model ED patient arrivals and making an overall assessment among them. The results can be used to aid in strategic decision-making on ED staffing and scheduling policy planning in response to predictable arrival variations.
AtıfScopus29WoS26OpenAlex37İncele - MakaleYalnız künye2018Scopus SJRQ2Preliminary geochemical data of the mafic rocks from the ovacik and Pülümür ophiolite zone (Eastern Anatolia, Turkey): Implications for the geodynamic evolution of the northern neotethyan ocean
Çimen, Okay; Önal, Ayten Öztüfekçi
The İzmir-Ankara-Erzincan-Sevan-Akera Suture Belt (IAESASB) stretches from the Aegean Sea to the Lesser Caucasus and includes the remnants of the Northern Neotethys. The Ovacık and Pülümür Ophiolite Zone (OPOZ) to the north of Tunceli is less-known members of this belt. In this study, preliminary geochemical data from the basaltic and gabbroic rocks from this zone are presented to provide the first insights into their geochemistry. The studied mafic samples exhibit geochemical characteristics of an intra-oceanic subduction system. Three types of samples were differentiated on the basis of their major, trace and rare earth element (REE) geochemistry. The first one is boninitic and displays highly depleted elemental pattern (relative to N-MORB) and concave REE profile. The second type is akin to back-arc basin basalts (BABB) and generally reflects normal-MORB (NMORB)-like high field strength element (HFSE) patterns coupled with negative Nb anomalies. The last type is relatively similar to the BABB-type, but it lacks the marked negative anomaly in Nb and can be ascribed to the mid-ocean ridge basalt (MORB). The overall geochemical features suggest that these mafic rocks were predominantly generated in a supra-subduction setting from a subduction-modified mantle source. It is further suggested that the Ovacık and Pülümür Ophiolite Zone was formed in an oceanic arc-basin system within the northward subducting Northern Neotethys.
AtıfScopus7İncele - MakaleAçık Erişim2019Scopus SJRQ1Al-doped ZnO as a multifunctional nanomaterial: Structural, morphological, optical and low-temperature gas sensing properties
Aydın, Handan; Yakuphanoglu, Fahrettin; Aydın, Cihat
In this study, zinc oxide thin films doped with Al at different atomic ratios (0.1%, 0.5%, 1%, 2%, 5%) were prepared using sol-gel spin coating method. Crystal structure, surface morphology, optical properties of the films and their response to ammonia gas were examined. XRD results showed that the ZnO thin films had a hexagonal polycrystalline structure. It was concluded from the calculation of the crystal size and lattice constant of the films that the produced samples were a nanomaterial. Scanning electron microscope (SEM) and atomic force microscope (AFM) images of the samples revealed that the morphology was composed of nanostructured particles and a cluster structure made of the combination of these particles. The optical band gap (Eg) of the prepared films were found within the range of 3.251 eV–3.342 eV by using the optical absorption method. Characteristics of susceptibility against ammonia gas were evaluated depending on the Al dopant. The obtained results showed that the gas response along with the structural, morphological, and optical properties of ZnO thin films changed with Al dopant. The produced thin film samples can be used as a sensor for the detection of ammonia gas in various industrial branches.
AtıfScopus66WoS59OpenAlex76İncele - MakaleYalnız künye2020Scopus SJRQ4The protective effects of golden berry (Physalis peruviana L.) extract against to the oxidative and destructive effects of type i diabetes in rats
Erman, Fazilet; Kaya, Tubay; Aydin, Sevinc; Erman, Orhan; Yilmaz, Okkes
Type I diabetes is known as insulin-dependent diabetes mellitus, and the most important factor playing role in its formation is the genetic predispo- sition. Physalis peruviana L. (Goldenberry) is a plant, which has strong antioxidant properties, from Solanaceae family and, because of its fructose con- tent, plays regulatory role in blood glucose level of diabetics. In this study, it has been investigated the effects of goldenberry on the malondialdehyde (MDA), reduced glutathione (GSH), total protein, vitamins A, D, E, and K, and cholesterol levels which are the indicators of antioxidant defense and the oxidative damages in serum, muscle, kidney, liver and brain tissues of the rats, on which type I diabetes was induced by STZ. According to the obtained results, among the rats with STZ-induced type I diabetes, it was ob- served that the level of glutathione (GSH) increased and the level of malondialdehyde (MDA) decreased in all of the tissues of rats given goldenberry extract, while significant decreases were determined in the levels of vitamins K-1, K-2, D-2 and D-3 in all of tissues (except serum), and there were also decreases in the level of α-tocopherol and cholesterol in tis- sues of muscle, liver and kidney. In this study, it was shown that the goldenberry decreased the destructive effects of type-I diabetes by decreasing the serum glucose and lipid peroxida- tion and increasing the level of glutathione. It is believed that the obtained results would be used in fol- low-up of diabetic patients and in early diagnosis of the disease in future.
AtıfScopus4İncele - MakaleYalnız künye2018Scopus SJRQ1Biochemical responses of Gammarus pulex to malachite green solutions decolorized by Coriolus versicolor as a biosorbent under batch adsorption conditions optimized with response surface methodology
Yildirim, Nuran Cikcikoglu; Tanyol, Mehtap; Yildirim, Numan; Serdar, Osman; Tatar, Sule
The current study was aimed to investigate the detoxifying and antioxidant enzyme response of Gammarus pulex exposed to malachite green (MG) after decolorization by Coriolus versicolor. Response surface methodology (RSM) was utilized to optimize the decolorization conditions of MG synthetic solutions by C. versicolor. Glutathione (GSH), malondialdehyde (MDA) levels and glutathione peroxidase (GPX), catalase (CAT), superoxide dismutase (SOD), glutathione S-transferase (GST), cytochrome P450 1A1 (CYP1A1) activities in G. pulex exposed to undecolorized (A1) and decolorized (A2) MG synthetic solution during 24 and 96 h were tested by using ELISA method. SOD and GPX enzyme activity was increased after decolorization (p > 0.05). CAT enzyme activity was increased in A2 group during 24 h (p > 0.05) but decreased during 96 h (p < 0.05). GSH levels were increased in A2 group during 24 and 96 h (p < 0.05). GST, CYP1A1 enzyme activity and MDA levels were decreased after decolorization during 96 h (p < 0.05). In this study, GSH levels, CAT, GST and CYP1A1 activities in G. pulex approved the capability of C. versicolor in MG decolorization, optimized with RSM.
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İncele - MakaleAçık Erişim2021Scopus SJRQ2The effect of nurses' compassion on burnout: A cross-sectional study
Kaplan Serin, Emine; Özdemir, Ahmet; Işik, Kevser
Purpose: This study was carried out to determine the effect of nurses' compassion on burnout. Design and Methods: This cross-sectional descriptive study was conducted with 177 nurses. An introductory information form, the compassion scale and the Maslach burnout inventory were used as the data collection tools. Frequency, percentage, t test, analysis of variance, Kruskal-Wallis, correlation, and regression were used in the analysis of the data. Findings: The majority of the participants were determined to be female, married and university graduates. It was determined that there was a significant negative relationship between the nurses' sense of compassion and burnout levels, and burnout decreased as compassion increased. Practical Implication: Burnout and compassion fatigue may lead to inadequate care for the patient. This situation will negatively influence nurses' care quality.
AtıfScopus13WoS10OpenAlex14İncele - MakaleYalnız künye2020Scopus SJRQ3Increasing the Power Generation by Raising the Capacity of the Thrust Bearing Oil Cooling System in Hydroelectric Power Plants
Kahraman, Gökhan
Cooling capacity decreases due to faults appearing over time in the thrust bearing oil cooling systems of hydroelectric power plants and cooling process cannot proceed sufficiently. For this reason, while the turbine-generator unit generates energy, the thrust bearing heats up. This temperature problem prevents the unit from operating at full capacity and therefore decreases in energy production. Producing deficient energy in hydroelectric power plants, which is a renewable energy source, causes long-term economic losses for countries. In this study, the thrust bearing cooling system of a vertical Francis turbine, which produces 150 MW of energy per hour, is investigated. The reduction in the cooling capacity over time in turbine thrust bearing cooling system is solved by using exchanger system with additional plate and the power produced by the turbine-generator unit is increased 15 MW/h. This improvement has greatly contributed to the national economy. The method of increasing the cooling capacity applied to the hydroelectric power plant thrust bearings can be applied to all hydraulic turbines. This method will increase the energy production amount of the unit by approximately 10% and it costs approximately 80% cheaper than completely replacing the existing cooling system.
AtıfScopus5WoS2OpenAlex5İncele - MakaleYalnız künye2018Scopus SJRQ3An efficient compression of ECG signals using deep convolutional autoencoders
Yildirim, Ozal; Tan, Ru San; Acharya, U. Rajendra
Background and objective: Advances in information technology have facilitated the retrieval and processing of biomedical data. Especially with wearable technologies and mobile platforms, we are able to follow our healthcare data, such as electrocardiograms (ECG), in real time. However, the hardware resources of these technologies are limited. For this reason, the optimal storage and safe transmission of the personal health data is critical. This study proposes a new deep convolutional autoencoder (CAE) model for compressing ECG signals. Methods: In this paper, a deep network structure of 27 layers consisting of encoder and decoder parts is designed. In the encoder section of this model, the signals are reduced to low-dimensional vectors; and in the decoder section, the signals are reconstructed. The deep learning approach provides the representations of the low and high levels of signals in the hidden layers of the model. Hence, the original signal can be reconstructed with minimal loss. Very different from traditional linear transformation methods, a deep compression approach implies that it can learn to use different ECG records automatically. Results: The performance was evaluated on an experimental data set comprising 4800 ECG fragments from 48 unique clinical patients. The compression rate (CR) of the proposed model was 32.25, and the average PRD value was 2.73%. These favourable observation suggest that our deep model can allow secure data transfer in a low-dimensional form to remote medical centers. We present an effective compression approach that can potentially be used in wearable devices, e-health applications, telemetry and Holter systems.
AtıfScopus201OpenAlex206İncele - MakaleYalnız künye2020Scopus SJRQ4Quality changes and storage life of common carp (Cyprinus carpio) with the use of Ginger (Zingiber officinale) essential oil
Sönmez, Pınar Erecevi t; Kuzgun, Nermin Karaton; Kirbağ, Sevda
Ginger (Zingiber officinale) essential oil is considered safe. In this study, ginger (Zingiber officinale) essential oil was used to extend storage life of common carp (Cyprinus carpio) and detect its protective effects. The following tests were performed to assess the shelf life of carp (C:control) treated with ginger essential oil (G). The microbiota growth of the carp, sensory properties, pH, TVB TBA values, the shelf life of the carp changed positively by adding ginger oil in different concentrations to the carp (C1, C2, C3: 0.1%, 0.25%, 0.5%ginger essential oil was added to carp samples). On the other hand; ginger essential oil has a positive effect on TVB-N and TBA values of carp fillets. With reference to the results of microbiota growth, carp sample (C: control) showed the highest value (P < 0.05) on the 6th storage day. The results show the importance of the use of Zingiber officinale essential oil to prevent food spoilage.
AtıfScopus2WoS1İncele - MakaleYalnız künye2020Scopus SJRQ2Evaluation of mobile games in the context of content: What do children face when playing mobile games?
Göksu, İdris; Aslan, Alper; Turgut, Yiğit Emrah
The aim of this study is to examine mobile games in the context of their content and to evaluate the situations faced by children through document analysis in terms of age-rating, game score, access permissions, the inclusion of advertisements, in-game purchases, encouraging consumerism, the inclusion of violence, bad habits, and educational value. The review and rating data of the games which can be found in Common Sense Media and Google Play Store were included in the study. These data were analyzed by descriptive content analysis using frequency (f) and percentage(%) values. According to our findings, it was revealed that 92% of the games involved in the study included in-game purchases and 75% of them included advertising. As a result of the investigations, it was also found that mobile games requested a lot of access permissions during installation. In addition, it was concluded that 90% of mobile games encouraged consumerism and 50% contained violence and fear elements. We think that the results are important in the way that they reveal the possible risks encountered by young people while they are playing mobile games and also in terms of increasing the awareness on the subject for both the users and their parents.
AtıfScopus5WoS7OpenAlex13İncele - MakaleYalnız künye2019Scopus SJRQ4ECG BEAT DETECTION and CLASSIFICATION SYSTEM USING WAVELET TRANSFORM and ONLINE SEQUENTIAL ELM
Yildirim, Ozal
Electrocardiogram (ECG) signals consist of data containing measurements of electrical activity in the heartbeats. These signals include relevant information used to detect abnormalities such as arrhythmia. In this study, a recognition system is proposed for detection and classification of heartbeats in ECG signals. Heartbeats in the ECG data were detected by using the wavelet transform (WT) method and these beats are segmented with determined periods. For obtaining distinctive features from the beats, multi-resolution WT is applied to these segmented signals, and wavelet coefficients are obtained from different frequency levels. Feature vectors are generated on these coefficients by using various statistical methods. The proposed recognition system is trained on feature vectors by using the Online Sequential Extreme Learning Machine (OSELM) classifier during the learning phase to automatically recognize the signals. Five different beat types were obtained from the MIT-BIH arrhythmia dataset. The multi-class dataset that includes five classes and the binary-class dataset that includes two classes were created among these beat types. Performance tests of the proposed wavelet-based-OSELM (W-OSELM) method were realized with these two datasets. The proposed recognition system provided 97.29% correct beat detection rate from raw ECG signals. The classification accuracy is 99.44% for the binary-class dataset and 98.51% for the multi-class dataset. Furthermore, the proposed classifier has shown very fast recognition performance on ECG signals.
AtıfScopus25WoS17OpenAlex26İncele - MakaleYayıncıda açık erişim2018Scopus SJRQ1Doping assessment in GaAs nanowires
Goktas, N Isik; Fiordaliso, E.M.; Lapierre, R.R.
Semiconductor nanowires (NWs) are a candidate technology for future optoelectronic devices. One of the critical issues in NWs is the control of impurity doping for the formation of p-n junctions. In this study, beryllium (p-type dopant) and tellurium (n-type dopant) in self-assisted GaAs NWs was studied. The GaAs NWs were grown on (111) Si by molecular beam epitaxy using the self-assisted method. The dopant incorporation in the self-assisted GaAs NWs was investigated using Raman spectroscopy, photoluminescence, secondary ion mass spectrometry and electron holography. Be-doped NWs showed similar carrier concentration as compared to thin film (TF) standards. However, Te-doped NWs showed at least a one order of magnitude lower carrier concentration as compared to TF standards. Dopant incorporation mechanisms in NWs are discussed.
AtıfScopus42WoS41OpenAlex48İncele - MakaleYalnız künye2018Scopus SJRQ1Boron, carbon, oxygen and radiogenic isotope investigation of carbonatite from the Miaoya complex, central China: Evidences for late-stage REE hydrothermal event and mantle source heterogeneity
Çimen, O.; Kuebler, C.; Monaco, B.; Simonetti, S.S.; Corcoran, L.; Chen, W.; Simonetti, A.
The Miaoya carbonatite complex (MCC) is located within the southern edge of the Qinling orogenic belt in central China, and is associated with significant rare earth element (REE) and Nb mineralization. The MCC consists of syenite and carbonatite that were emplaced within Neo- to Mesoproterozoic-aged supracrustal units. The carbonatite intruded the associated syenite as stocks and dikes, and is mainly composed of medium- to fine-grained calcite and abundant REE-bearing minerals. Carbonatite melt generation and emplacement within the MCC occurred during the Silurian (at ~440 Ma), and was subsequently impacted by a late-stage hydrothermal event (~232 Ma) involving REE-rich fluids/melt. This study reports trace element and stable (B, C, and O) and radiogenic (Nd, Pb, and Sr) isotope data for the MCC carbonatite, and these have been subdivided into three groups that represent different REE contents, interpreted as varying degrees of hydrothermal interaction. Overall, the group of carbonatites with the lowest enrichment in LREEs (i.e., least affected by hydrothermal event) is characterized by δ11B values that vary between −7 (typical asthenospheric mantle) and + 4‰; δ11B values and B abundances (~0.2 to ~1 ppm) do not correlate with LREE contents. The Sm-Nd and Pb-Pb isotope systems have both been perturbed by the late-stage, REE-rich hydrothermal activity and corroborate open-system behavior. Contrarily, initial 87Sr/86Sr ratios (vary between ~0.70355 and 0.70385) do not correlate significantly with both LREEs and Sr abundances, nor with initial 143Nd/144Nd ratios. The late-stage hydrothermal event overprinted the Nd and Pb isotope compositions for most of the carbonatite samples examined here, whereas a majority of the samples preserve their variable B and Sr isotope values inherited from their mantle source. The B and Sr isotope data for carbonatites exhibiting the least LREE enrichment correlate positively and suggest carbonatite melt generation from a heterogenous upper mantle source that records the input of recycled crustal material. This finding is consistent with those previously reported for young (<300 Ma old) carbonatites worldwide.
AtıfScopus42WoS39İncele - MakaleYalnız künye2018Scopus SJRQ3Response surface modeling for Pb(II) removal from alcoholic beverages using natural clay: Process optimization with box–behnken experimental design and determination by electrothermal AAS
Ince, Olcay Kaplan; Ince, Muharrem; Onal, Ali
A three-level four-factor Box–Behnken experimental design (BBD) combined with response surface modeling (RSM) was used for the optimization and modeling of Pb(II) adsorption from alcoholic beverages onto natural clay. The BBD method was chosen as the statistical prediction method to reduce the experimental numbers which saves time and chemicals and reduce analysis cost. Various independent process variables including solution pH (X1: 3.0– 7.0), contact time (X2: 2–60 min), adsorbent dosage (X3: 0.01-0.1 g), and agitation speed (X4: 50–150 rpm) were optimized. The optimal conditions used for Pb(II) removal were pH of 5.3, contact time 38.9 minutes, 0.071 g adsorbent dosage, and 98.7 rpm agitation speed, resulting in a maximum removal efficiency of 120 mg g-1. Pb was determined by electrothermal AAS. The significance of the independent variables and their interactions were tested by means of the analysis of variance (ANOVA) and are based on the ANOVA statistical value. The adsorption of Pb(II) onto clay was found to be highly significant with very low probability (p) values (<0.001). These results were justified by the relatively high correlation coefficients (R2 = 0.9965, R2 adj = 0.9930, and R2 Pred= 0.9819) of the statistical prediction. FTIR analysis confirmed major participation of amide, amines, ketones, including the primary alcohol groups, during Pb(II) biosorption. Clay was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM), coupled with energy dispersive X-Ray (EDX). The proposed adsorption process efficiently removes Pb(II) present in various aqueous media and can be used for industrial wastewater or drinks.
AtıfScopus6İncele - MakaleAçık Erişim2020Scopus SJRQ1Thermal Image Processing Technique for Determination of Temperature Distributions of Minced Beef Thawed by Ohmic and Conventional Methods
Döner, Deniz; Çokgezme, Ömer Faruk; Çevik, Mutlu; Engin, Mustafa; İçier, Filiz
In the present study, the effectiveness of ohmic thawing (OT) on temperature distribution (TD) was evaluated by using a non-destructive measurement method: thermal imaging (TI). The effects of both OT process parameters and sample properties on TD of thawed minced beef were determined. Thermal images were taken from the central cross-sectional area of a thawed sample. In the first part of the study, the effects of OT system parameters (voltage gradient; 10–13–16 V/cm and electrode type; E1:titanium foil electrode with a smooth surface, E2: needled-type titanium electrode, E3: titanium electrode with pyramid surface shaped) and sample shape (X: 13 × 4 × 3 cm3; Y: 13 × 6 × 2 cm3; Z: 13 cm height × 3.91 cm diameter) were analyzed in detail. The best thawing condition (electrode type E2 and sample shape Y) was determined by taking into account of thawing time and TD properties obtained from a developed TI processing technique. In the second part of the study, the effects of OT process on TD properties of minced beef having different fat contents (2–10–18%) were compared with those of two different conventional thawing processes (stationary cold ambient + 4 °C -RT and under cold running water + 4 °C -WT). The percentage of thawed portions in central section was above 68% for OT and varied between 12 and 54% for CT. Rectangular-shaped samples had more homogeneous temperature distributions than cylindrical samples (p < 0.05). TI could be used to control the process by non-destructive monitoring of temperature during OT.
AtıfScopus36WoS31OpenAlex35İncele - MakaleAçık Erişim2020Scopus SJRQ4The Effect of Resveratrol on The Oxidative Stress in Rats Treated with Irradiation
Ozcelik, Mehtap; Erisir, Mine; Guler, Osman; Baykara, Murat; Bulmus, Funda Gulcu
The antioxidant and protective effect of resveratrol against irradiation induced oxidative damage were researched. Twenty-one rats were seperated into 3 groups; First group was the control group. Second group was the irradiation group; received physiological saline intraperitoneally (i.p.) for three days, then 9 Gray (Gy) irradiation was applied. Third group was irradiation+Resveratrol group; received 10 mg/kg resveratrol i.p. for three days and then the same dose of radiation was applied. As a result of irradiation, a significant increase was found in the level of malondialdehyde (MDA) in the liver, kidney and brain tissues of rats (P<0.001). Glutathione peroxidase (GSH-Px) activity in all the tissues and superoxide dismutase (SOD) activity, Glutathione (GSH) levels in liver decreased (P<0.01), GSH levels in kidney, spleen and ovarium tissues significantly increased (P<0.05). The giving of resveratrol significantly reduced the MDA levels increasing in liver, kidney, and brain as a result of irradiation (P<0.001) and the liver MDA levels reached to the control levels. By giving resveratrol, it was determined that all the antioxidants studied reduced significantly compared to the control group and/or the irradiation group (P<0.05). According to the data obtained as a result; It was concluded that resveratrol shows a corrective effect by changing the oxidant/antioxidant balance against oxidative stress caused by irradiation, therefore resveratrol is a powerful antioxidant.
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İncele - MakaleAçık Erişim2020Scopus SJRQ3Age and growth of the phaeton dragonet, Synchiropus phaeton (Actinopterygii: Perciformes: Callionymidae), from the gulf of iskenderun, north-eastern mediterranean, Turkey
Başusta, Asiye; Ozcan, Ebru İfakat; Başusta, Nuri
Background. Synchiropus phaeton (Günther, 1861) is a sexually dimorphic, benthic species that inhabits mud bottoms. This fish is one of the important by catch species in the trawl fishing. There is no commercial value. But it has ecological importance in this area. The information about the biology of S. phaeton is very limited. This study was conducted to investigate the age and growth relation of phaeton dragonet inhabiting the Gulf of Iskenderun, north-eastern Mediterranean coast of Turkey. Materials and methods. A total of 289 phaeton dragonets were collected as discards during the commercial trawl fishing at the depth range of 100–150 m in the Gulf of Iskenderun, north-eastern Mediterranean. The fish age was determined from sagittal otoliths. The age readings were performed using Leica S8APO microscope and were documented with the Leica Application Suite (Ver. 4.8.0) software. The index of the mean percentage error (IMPE) was calculated to assess the precision of the age determination between two independent readers. Growth parameters for all specimens were subsequently determined by fitting the observed and the length-at-age data using the von Bertalanffy growth equations. Total length–weight relations (LWRs) and the condition factor (CF) were determined. Results. The total length and weight of S. phaeton ranged from 7.0 to 19.0 cm and from 2.01 to 22.0 g, respectively. The age of the studied individuals ranged from 2 to 7 years. The parameters of von Bertalanffy growth fitted to the mean observed total lengths-at age for each sex separately and were estimated as L∞ = 23.358 cm, K = 0.248 year–1, t0 = –0.501 years for females and L∞ = 26.543 cm, K = 0.156 year–1, t0 = –0.662 years for males, respectively. The overall growth performance index (G) value was determined as 3.46 for the combined sexes. The total length– weight relations were determined as W = 0.0121TL2.55, R² = 0.94; 95% confidence intervals of b = 2.395–2.687, t-test P < 0.05 for females and W = 0.0094TL2.64,R2 = 0.93; 95% confidence intervals of b = 2.470–2.803, t-test P < 0.05 for males. The types of growth were found negatively allometric (b < 3). The highest condition factor was found at the age of 2 (0.62), while the lowest was found at the age of 6 (0.26). Conclusions. The presently reported study provides the first data on the age and growth of the S. phaeton that had not been studied previously in the Gulf of Iskenderun, north-eastern Mediterranean of Turkey. This study will contribute significantly to the conservation and management strategies of the species of S. phaeton in the future.
AtıfScopus2WoS2OpenAlex2İncele - Kitap BölümüYalnız künye2019Masculine dreams: Henry V and the Jacobean politics of court performance
Öğütcü, Murat
AtıfScopus7OpenAlex3İncele
