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Koleksiyondaki öğeler
- MakaleYalnız künye2016Scopus SJRQ3EFFECTS OF SALINITY, LIGHT AND NITROGEN CONCENTRATION ON GROWTH AND LIPID ACCUMULATION OF THE GREEN ALGAE DUNALIELLA BARDAWIL
Can, Safak Seyhaneyildiz; Cirik, Semra; Koru, Edis; Turan, Gamze; Tekogul, Hatice; Subakan, Tugba
Efficient biofuel production from algae depends on the microalgal biomass production rate and lipid content. Both biomass production and lipid accumulation are limited by several factors, of which nutrients play a key role. In this study, the marine microalgae Dunaliella bardawil was used as a model organism. D. bardawil was cultured at two different sodium nitrate concentrations as 0 and 0.7 M, at six different amounts of salinity as 0.65, 1.0, 1.5, 2.0, 2.75 and 3.5 M, and at two different light intensity levels as 65 and 800 mu mol foton m(-2) s(-1) The study was done under pH 7. After 15-day growth period, the most efficient culture of D. bardawil for both biomass increase and lipid production was determined for the samples with 39.67 +/- 4.51 lipid rates cultured under 0.7 M nitrate concentration, 2.75 M salinity and 800 mu mol photon m(-2) sn(-1) light intensity. This high level of lipid production is sufficient to use D. bardawil for biodiesel production. Also after the evaluation of fatty acid results of GC-FID analysis, it was determined that D. bardawil contains high rate of medium length (C16-C18) fatty acid chains suitable for the production of biodiesel. These results are satisfactory to use D. bardawil in biodiesel production.
AtıfWoS2
İncele - MakaleAçık Erişim2016Scopus SJRQ2Changes in the texture, physicochemical properties and volatile compound profiles of fresh Kashar cheese (<90 days) during ripening
Eroglu, Ali; Toker, Omer Said; Dogan, Mahmut
In this study, four different fresh Kashar cheese samples were ripened for 90 days. The physicochemical properties, texture attributes, fatty acid composition and volatile compound profiles of the samples were measured every 30 days of ripening. The texture properties of the cheese samples were significantly affected by the duration of the ripening period. The results of this study highlighted that texture parameters as a function of ripening period should be considered for both fresh and aged Kashar cheeses to determine the ripening period as they are very important for consumer acceptability and consumption of the end product.
AtıfWoS27İncele - MakaleAçık Erişim2017An Epidemiological Examination of Suicides That Have Occurred in Tunceli During 2005-2015
Günderci, Azad; Karatay, Gulnaz; Gökçe, Seher; Güler, Burcu
Objective: The study aims to investigate the phenomena in suicides and attempted suicides that have occurred in Tunceli during 2005-2015, with respect to certain characteristics. Method: The files for 435 suicides and attempted suicide incidents in total, which have been recorded in Tunceli during 2005-2015, have been examined in this paper. Results: The suicide incidents have been determined most frequently among individuals under 24 years of age. In the evaluation of the causes for suicide, unknown reasons (51.5%) have been followed by family problems (21.1%) and psychiatric disorders (18.2%). Drug intoxications, use of stabbing instruments and hanging methods have taken the top three ranks among the suicide methods. 91.3% of the incidents consisted of suicide attempts and 8.7% completed suicides. While the ratio of completed suicides has been determined to be meaningfully higher in males (7.1%), the ratio of attempted suicides has been determined to be higher in females (95.6%) (p<0.05). Furthermore, it has been determined that the suicide incidents were observed more frequently during the spring and summer seasons and more in urban zone. Conclusion: Our findings indicate that the causes of almost half of the suicide incidents in Tunceli are not known. The most important risk factors for suicide have been identified as young age, male gender, unemployment, urban life, impaired mental health and in-family problems. Further comprehensive studies are recommended as aimed to assess the suicide incidents in Tunceli and take protective measures for the risk factors.
AtıfWoS2OpenAlex6İncele - MakaleAçık Erişim2013Scopus SJRQ2Self-dual metrics on non-simply connected 4-manifolds
Kalafat, Mustafa; Ozan, Yildiray; Arguez, Hulya
We construct self-dual (SD) but not locally conformally flat (LCF) metrics on families of non-simply connected 4-manifolds with small signature. We construct various sequences with bounded or unbounded Betti numbers and Euler characteristic. These metrics have negative scalar curvature. As an application, this is used to address Remark 4.79 of [1]. (C) 2012 Elsevier B.V. All rights reserved.
AtıfWoS3OpenAlex6İncele - MakaleYalnız künye2016Scopus SJRQ3Experimental and modeling studies of methylene blue adsorption onto particles of peanut shell
Kiliç, Fatih; Sarici-Özdemir, Cigdem
In this study, adsorption of methylene blue from aqueous solution onto peanut shell has been investigated. Experimental data obtained from dye adsorption have been studied by five two-parameter (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin, and Frumkin) and five three-parameter (Redlich-Peterson, Sips, Toth, Radke-Prausnitz, and Koble-Corrigan) isotherm models. Eight nonlinear error functions (sum squares errors, hybrid fractional error function, Marquardt's percent standard deviation, average relative error, sum of absolute error, the coefficient of determination, nonlinear chi-square test, and standard deviation of relative errors) were examined for isotherm equations. In order to explain the adsorption kinetics fit of pseudo-first-order, pseudo-second-order, Elovich, and intraparticle kinetic models were used. The best fitting isotherm model was the Radke-Prausnitz and kinetics model was pseudo-second-order. Adsorption experiment showed that the maximum capacity of agricultural waste for methylene blue was 67.57 L.g(-1) at 25 degrees C.
AtıfWoS7OpenAlex8İncele - MakaleYalnız künye2017On Complex η-Einstein Normal Complex Contact Metric Manifolds
Vanli, Aysel Turgut; Unal, Inan
The aim of this paper is focusing on eta-Einstein geometry of normal complex contact metric manifolds. We give the definition of complex eta-Einstein normal complex contact metric manifolds. In addition, we study on concircular curvature tensor Z on a normal complex contact metric manifold which satisfy Z (U, X).Z = 0 and Z(V, X).Z = 0. Also, we prove that a projectively semi-symmetric normal complex contact metric manifold is complex eta-Einstein.
AtıfWoS3İncele - MakaleAçık Erişim2020Anthropogenic Pollution Assessment of Pertek (Tunceli) Geothermal Field
Balaban, Tugbanur Ozen; Okan, Ozlem Oztekin; Sançar, Taylan; Önal, Ayten Oztufekci
The study area is located in Pertek town in Tunceli province in Eastern Anatolia. The geology of the study area is very important for the geodynamic evolution of the Eastern Taurus. Geological formations in the study area are Paleozoic Keban metamorphics, Upper Cretaceous Harami Formation, Middle-Upper Eocene Kirkgecit Formation, Upper Miocene Karabakir Formation, and Quaternary alluvium, from the oldest to the youngest, respectively. Hydrogeological units were divided into three units in accordance with lithological, structural and hydrogeological properties. The basement of the study area of sandstone, marbles and dolomitic marbles in the Keban metamorphic rocks are highly fractured and karstified and act as the main reservoir in particular for thermal waters in the study area. Kirkgecit and Karabakir Formations occur as barrier rocks in the geothermal area due to impermeable properties. Some levels of limestone units within the Keban metamorphics are aquifers for freshwater. Alluvium is the most important and suitable unit for cold groundwater production. In the study area, streams and rivers flow from southwest to northeast towards Keban Dam Lake. The lake is very important in the region from the point of view of hydroelectric power production, flood control, and irrigation. The thermal and mineral waters generally have high mineral contents. When they are discharged onto the surface, they can cause contamination in surface water, ground water, and of soil. Because of the fact that the water resources in the region are used for drinking and irrigation purposes, the quality of the water is evaluated within the scope of this study. For this reason, water and sediment samples were analyzed for boron, arsenic and other contaminant (Pb, Fe, Sb, Sn and Hg) substances to measure the contamination. The results acquired from the analysis of water samples suggest that concentrations of B, As and Pb in some of the samples exceed the limits of the TSE drinking-water standards(>100 ppb). Fe concentration is 2.16 ppm, Hg and Sb concentrations are also 0.05 ppm. Moreover, some of the sediment samples collected from thermal springs in Singec Creek are contaminated with B, As, Sb, Hg and Pb and other elements sourced from geothermal fluids. In this study, the geochemical evaluation of the presence of B, As, and other contaminants (Pb, Fe, Sb, Sn) derived from geothermal activities within sediment and water in the Pertek Geothermal Field and surrounding area were discussed.
AtıfWoS2OpenAlex2TR Dizin2
İncele - MakaleAçık Erişim2010Scopus SJRQ1A new algorithm for automatic classification of power quality events based on wavelet transform and SVM
Eristi, Hueseyin; Demir, Yakup
This paper presents a new approach for automatic classification of power quality events, which is based on the wavelet transform and support vector machines. In the proposed approach, an effective single feature vector representing three phase event signals is extracted after signals are applied normalization and segmentation process. The kernel and penalty parameters of the support vector machine (SVM) are determined by cross-validation. The parameter set that gives the smallest misclassification error is retained. ATP/EMTP model for six types of power system events, namely phase-to-ground fault, phase-to-phase fault, three-phase fault, load switching, capacitor switching and transformer energizing, are constructed. Both the noisy and noiseless event signals are applied to the proposed algorithm. Obtained results indicate that the proposed automatic event classification algorithm is robust and has ability to distinguish different power quality event classes easily. (C) 2009 Elsevier Ltd. All rights reserved.
AtıfWoS78OpenAlex106İncele - MakaleAçık Erişim2020Determination of Some Aroma Metabolites of Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus Isolates from Traditional Yogurt, by HPLC
Yazdiç, Fadime; Akyol, Ismail; Yazdiç, Ferit Can
This study was conducted to determine lactic acid bacteria isolated from Turkish yoghurts produced by traditional methods, amounts of usage of milk lactose in carbohydrate metabolism and formate, pyruvate, 3-hydroxy-2-butanone (acetoin), ethanol and 2,3-butandiol production amounts by HPLC. Two lactic acid bacteria species, widely used in traditional and industrial yoghurt production Streptococcus thermophilus (St. thermophilus) and Lactobacillus delbrueckii subsp. bulgaricus (Lb. bulgaricus) were used from cultural stock. Production potentials of the above mentioned metabolites of 88 pieces of St. thermophilus and 12 pieces of Lb. bulgaricus were researched in different mediums and milk. St. thermophilus isolates were grown in anaerobic SM17, aerobic SM17, LM17 and milk and Lb. bulgaricus isolates were grown in anaerobic MRS (Man, Rogosa and Sharp Broth), aerobic MRS and milk. Amounts of formate, pyruvate, 3-hydroxy-2-butanone, ethanol and 2,3-butandiol determined by HPLC of St. thermophilus isolates were specified respectively as 0.1 +/- 0.0-77.0 +/- 0.2 mg/kg, 0.1 +/- 0.0-90.2 +/- 0.0 mg/kg, 0.1 +/- 0.0-127.0 +/- 8.4 mg/kg, 2.1 +/- 0.0-191.4 +/- 1.1 mg/kg and 1.1 +/- 0.0-130.0 +/- 5.2 mg/kg. Amounts of formate, pyruvate, 3-hydroxy-2-butanone, ethanol and 2,3-butandiol of Lb. bulgaricus isolates were specified respectively as 0.2 +/- 0.0-57.0 +/- 1.0 mg/kg, 0.1 +/- 0.0-3.2 +/- 1.0 mg/kg, 0.1 +/- 0.1-77.0 +/- 2.0 mg/kg, 9.1 +/- 3.09-5.3 +/- 5.0 mg/kg and 6.2 +/- 0.2-98.4 +/- 2.0 mg/kg. Metabolites that determined quantified ranges in study, belong to subcultures of bacteria isolated from yoghurts fermented by traditional methods. These isolates have the potential to be a starter culture for commercial yogurt industry.
AtıfWoS1OpenAlex2TR Dizin1İncele - MakaleYalnız künye2014Scopus SJRQ3Use of Clove Oil and Eugenol to Anesthetize Fingerling Shabut Barbus grypus
Ögretmen, Fatih; Gölbasi, Selami; Inanan, Burak E.; Kizak, Volkan; Kayim, Murathan
In this study, the efficacy of four doses of clove oil and eugenol were compared to sedate fingerling Shabut Barbus grypus to various stages of sedation and recovery. The results from the present study indicated that effective concentrations were at 50L/L for eugenol (induction time: 58 8s; recovery time: 199 +/- 15s [mean +/- SD]) and clove oil (induction time: 76 +/- 6s; recovery time: 161 +/- 34s). The induction times decreased significantly with the increasing concentrations of clove oil and eugenol, while recovery times increased with increasing concentrations of anesthetic (P < 0.05). Exposure of fish to 75 or 100L/L clove oil or to 50, 75, or 100L/L eugenol resulted in mean induction times 1min. Fish did not become fully sedated within 3min when treated with 25L/L clove oil. Other concentrations of both anesthetics, fish reached to full induction at 3min and recovered from anesthesia 5min. Our results showed the clove oil and eugenol are effective anesthetics for fingerling Shabut when used at concentrations of 50-100L/L. Received March 25, 2013; accepted July 5, 2013
AtıfWoS10OpenAlex14İncele - BildiriYalnız künye2014Scopus SJRQ2An organic-inorganic rectifying contact based on a ZnPc derivative
Ozerden, Enise; Yildiz, Mustafa; Ocak, Yusuf Selim; Tombak, Ahmet; Kilicoglu, Tahsin
An organic-inorganic rectifying contact was fabricated by forming a thin film of a Zinc Phthalocyanine (ZnPc) derivative, Zinc 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H, 31H-phthalocyanine (oc-ZnPc), on a p-Si wafer and evaporating Al on the structure. The current-voltage (I-V) and capacitance-voltage (C-V) measurements of Al/oc-ZnPc/p-Si structure were taken in dark at room temperature. The I-V measurements proved that the structure showed excellent rectification. Some basic diode parameters like ideality factor and barrier height were calculated from lnI-V plot. Ideality factor and barrier height values were found as 144 and 0.78 eV, respectively. The series resistance value of the structure was determined as 5.46 k Omega by means of Norde functions. The C-V measurements were taken for various frequencies and it was seen that the capacitance value decreased with increasing frequency. In addition I-V measurements of the Al/oc-ZaPc/p-Si/Al were repeated under light which had illumination intensity of 40-100 mW/cm(2). It was observed that reverse bias current of the diode increased with the light intensity. Therefore, the structure showed photodiode characteristics and it can be used for electrical and optoelectronic applications. (C) 2014 Elsevier Ltd. All rights reserved.
AtıfWoS10OpenAlex12İncele - BildiriYalnız künye2016Comparison of Physics-Based Optimization Algorithms by Using Benchmark Functions
Kiziloluk, Soner; Özer, Ahmet Bedri
Many of meta-heuristics optimization algorithms which are used to solving optimization problems are inspired from biological evolution, physical, social and chemical processes. Electromagnetism-like Algorithm (EM), Big Bang-Big Crunch Algorithm (BB-BC) and Gravitational Search Algorithm (GSA) are investigated in this study and they are physics-based meta-heuristics techniques. Performances of EM, BB-BC and GSA are compared by using Rastrigin, Rosenbrock and De Jong test functions.
AtıfWoS1İncele - MakaleYalnız künye2018COMPARISON OF FEM SOLUTION WITH ANALYTICAL SOLUTION OF CONTINUOUS AND DISCONTINUOUS CONTACT PROBLEM
Kaya, Yusuf; Polat, Alper; Özsahin, Talat Sukru
The continuous and discontinuous contact problem of a homogeneous layer loaded with three rigid flat blocks and resting on the elastic semi-infinite plane was investigated in this study by using the finite element method (FEM). All surfaces are assumed to be frictionless. The homogenous layer was loaded by means of three rigid flat blocks whose external loads are Q and P (per unit thickness in z direction). Two dimensional finite element analysis of the problem was performed using ANSYS package program. Analyzes were performed for loading conditions which are Q=P, Q=2P, Q=4P, Q=8P and Q=10P, and different values of block widths, distances between blocks and shear modulus. The initial separation loads and initial separation distances (lambda(cr), chi(cr)) between the homogeneous layer and the elastic semi-infinite plane were determined for continuous contact condition. The length of the separation zone was obtained for discontinuous contact condition. In addition to these, normal stress distributions between the layer and the semi-infinite plane were determined for continuous and discontinuous contact conditions. As a result of the study, the analytical results, and the results of the finite element method were shown by comparing as graphs and tables.
AtıfWoS5İncele - BildiriYalnız künye2020The Effect of Different Noise Levels on The Performance of The Audio Search Algorithm
Köseoglu, Murat; Uyanik, Hakan
Audio fingerprint technique is a method that creates a unique and compact identity for audio data and is also used to distinguish these identities from each other. In this study, an algorithm, based on the methods used in Shazam 's audio fingerprint technique and hash functions, was developed to recognize multimedia audio files by using MATLAB software, and it was tested against noise factor of different levels. Experimental results have shown that the developed algorithm gives successful results against the noise factor. In addition, it has been understood that the preferred hash function technique has revealed satisfying results in comparison with the conventional techniques.
AtıfOpenAlex5İncele - MakaleYalnız künye2011Scopus SJRQ2Immunostimulating Effect of Levamisole on Spleen and Head-Kidney Leucocytes of Rainbow trout (Oncorhynchus mykiss, Walbaum 1792)
Seker, Engin; Ispir, Unal; Dörücü, Mustafa
An in vitro cultivation method for spleen and head kidney organ section were used to investigate the effects of levamisole on the immune response. After 10 days of culture with 10 mu g/ml, 50 mu g/ml and 100 mu g/ml or no levamisole in the culture media, the non specific defense reaction were measured by glass-adherent NBT (nitroblue tetrazolium) positive cells activation and phagocytic activity. Elevation in phagocytic activity was found for 10 mu g/ml and 50 mu g/ml levels of levamisole (P < 0.001), but no differences were found at levels of phagocytic activity in between 100 mu g/ml levamisole groups and control groups (P > 0.05). In the spleen and head kidney leucocytes, increased response to levamisole was shawn for all doses in the glass-adherent NBT positive cells activation.
AtıfWoS7İncele - MakaleAçık Erişim2015Scopus SJRQ1Trichlorfon-induced haematological and biochemical changes in Cyprinus carpio: ameliorative effect of propolis
Yonar, M. Enis; Yonar, Serpil Mise; Pala, Aysegul; Silici, Sibel; Saglam, Naim
Trichlorfon is among the most commonly used products to treat fish parasites in aquaculture. We investigated the effectiveness of propolis in alleviating the toxicity of trichlorfon on haematological and oxidant/antioxidant parameters in carp Cyprinus carpio. Fish were exposed to sublethal concentrations (11 and 22 mg l(-1)) of trichlorfon, and propolis (10 mg kg(-1) of fish weight) was simultaneously administered. At the end of 14 d administration, blood and tissue (liver, kidney, gill) samples were collected. Haematological changes (red and white blood cell count, haemoglobin concentration, haematocrit level and erythrocyte indices: mean corpuscular volume, mean corpuscular haemoglobin and mean corpuscular haemoglobin concentration) were determined in the blood samples, while antioxidant parameters (malondialdehyde and reduced glutathione levels and superoxide dismutase, catalase and glutathione peroxidase activities) were evaluated in the liver, kidney and gill samples. Trichlorfon led to negative alterations in the haematological and antioxidant parameters investigated. The administration of propolis alleviated this effect and suggests that fish treated with trichlorfon improve their physiological status when fed a propolis-supplemented diet.
AtıfWoS46OpenAlex56
İncele - MakaleYalnız künye2016Scopus SJRQ1Essential oil composition and antimicrobial activity of two endemic Kundmannia SCOP. species from Turkey
Paksoy, Mehmet Yavuz; Diraz, Emel; Digrak, Metin; Tutar, Esen; Karaman, Sengul
Kundmannia anatolica HUB.-MOR. and Kundmannia syriaca BOISS. are two endemic species of Apiaceae diversified in Turkey. In the present study, the essential oil composition and antimicrobial activity of these endemic species collected from Southeast Anatolia region of Turkey were investigated. Essential oils of aerial parts were obtained by hydro distillation method and analyzed by GC-MS/FID. Acetone, chloroform and methanol extracts of aerial parts of the plants were tested against seven bacteria and three yeasts by disc diffusion method for antimicrobial assays and minimum inhibition concentrations (MIC) were determined. Spathulenol, curdione, apritone, germacrene-d and- (-) globulol were the major components of K. anatolica. In the essential oil of K. syriaca, spathulenol, germacrene-d, bioallethrin, 12-norcyercene-B and beta methadol were determined as the main compounds. The most abundant compound of K anatolica and K. syriaca was spathulenol with 17.40%-19.53% ratio in the GC-MS and 19.7%, 24.99% ratio in GC-FID results, respectively. Aerial parts extracts of K. anatolica and K. syriaca exhibited remarkable antimicrobial activity to all tested microorganisms except for Candida albicans. (C) 2015 Elsevier B.V. All rights reserved.
AtıfWoS12OpenAlex13İncele - MakaleAçık Erişim2016Scopus SJRQ2Comprehensive structural analysis of the open and closed conformations of Theileria annulata enolase by molecular modelling and docking
Mutlu, Ozal; Yakarsonmez, Sinem; Sariyer, Emrah; Danis, Ozkan; Yuce-Dursun, Basalt; Topuzogullari, Murat; Akbulut, Ekrem; Turgut-Balik, Dilek
Theileria annulata is an apicomplexan parasite which is responsible for tropical theileriosis in cattle. Due to resistance of T. annulata against commonly used antitheilerial drug, new drug candidates should be identified urgently. Enolase might be a druggable protein candidate which has an important role in glycolysis, and could also be related to several cellular functions as a moonlight protein. In this study; we have described three-dimensional models of open and closed conformations of T. annulata enolase by homology modeling method for the first time with the comprehensive domain, active site and docking analyses. Our results show that the enolase has similar folding patterns within enolase superfamily with conserved catalytic loops and active site residues. We have described specific insertions, possible plasminogen binding sites, electrostatic potential surfaces and positively charged pockets as druggable regions in T. annulate enolase. (C) 2016 Elsevier Ltd. All rights reserved.
AtıfWoS8OpenAlex8İncele - BildiriYalnız künye2017Link Prediction Methods in Bipartite Networks
Aslan, Serpil; Kaya, Mehmet
Nowadays, social networks, whose application areas are increasing day by day; Such as data mining, protein-gene interaction networks, online social networks, transport networks, academic information networks, and telecommunications networks. Many real-world complex networks have a naturel bipartite structure. In bipartite networks, which have become the focus of many researchers who have been dealing with social network analysis in recent years, connection estimation methods are the basic methods used to understand the structure of these networks. This study is a survey work that describes the connection in a bipartite network that is suitable for the nature of today's huge data networks. In this study, a bipartite network interface is an introductory guide for researchers who plan to work on this subject by examining the internal links and bipartite network projection methods.
AtıfWoS4İncele - MakaleYalnız künye2018Scopus SJRQ3THE EFFECTS OF MANNAN OLIGOSACCHARIDE (MOS) AND VITAMIN B12 ADDITIVES ON THE LIVER AND INTESTINE HISTOLOGY OF THE CARP FRY (CYPRINUS CARPIO L-1758)
Ates, Mehmet; Atar, Hasan Huseyin
In this study, four hundred (400) carp frys (Cyprinus carpio L. 1758) were fed for 90 days with commercial feed containing Mannan oligosaccharide (MOS) and Vitamin B-12. The effects of feeding with MOS and Vitamin B-12 additives in different proportions on the parameters on intestine and liver histology of the carps were studied. As a result of this particular study, no pathological disorder was observed in the liver cells based on histologic reviews. The villi in the intestine showed slight increase both in terms of length and thickness within the group fed with MOS, while the other groups fed without MOS showed no alteration for this particular organ.
