Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4172
  Effects of the Different Methacrylate Monomers on Bond Strength Between Soft Liner and Acrylic Resin

  Bolayir, Giray; Soygun, Koray; Simsek, Selcuk; Yilmaz, Ersen; Dogan, Arife; Boztug, Ali; Dogan, Orhan Murat

  In the present study, tensile bond strength between on acrylic resin and a soft liner, molloplast B, was studied. To enhance the bonding capacity between these materials, acrylic resin surface was modified using ethyl methacrylate, iso-butyl methacrylate or tert-butyl methacrylate monomers. The monomers were applied onto the surfaces of methacrylate components for 60, 120 or 180 s and the bond strength values were obtained. The values were statistically compared. Changes on the modified surfaces were investigated by fourier transform infared spectroscopy with attenuated total reflectance (FTIR-ATR). The highest bond strength value was obtained from 120 s treatments with ethyl methacrylate and the lowest value was obtained from 60 s treatments with iso-butyl methacrylate. These high alkyl monomers also had secondary interactions on the acrylic surfaces, evidenced by FTIR-ATR.

  AtıfOpenAlex1

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• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4129
  Determination of the Antioxidant Vitamin Levels in Fresh and Dried Bee Pollens in Bingol's Flora

  Alayunt, Naci Omer; Karagözoglu, Yusuf; Parlak, Akif Evren; Türkoglu, Semra

  In this study, fresh pollens collected from Bingol, province in Turkey were analyzed in June and the dried pollens stored by being kept in a cool, dark place for 8 months at room temperature were analyzed again in February. It was determined that, during this time, there was the maximum loss in the group Adakli with 68.23 % in terms of vitamin A, in the group Gokdere with 70.60 % in terms of vitamin E, in the group Adakli with 71.01 % in terms of vitamin C. These results obtained about the values of vitamin may vary depending on the geographic location where the pollen grows up, the season in which it is gathered and its drying and storage conditions.

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  AtıfWoS3·OpenAlex4

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• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4143
  Bioaccumulation of Copper and Zinc in Freshwater Crayfish (Astacus leptodactylus) Fed with Zebra Mussels (Dreissena polymorpha) Collected from Keban Dam Lake, Turkey

  Aksu, Onder; Gulec, Azime Kucukgul; Demir, Veysel; Danabas, Durali; Yildirim, Numan; Ozcelik, Mehtap; Can, Erkan; Kocabas, Mehmet

  This study is aimed to determine the bioaccumulation of copper and zinc in hemolymph of freshwater crayfish (Astacus leptodactylus) fed with zebra mussel (Dreissena polymorpha) collected from Keban Dam Lake. This is the first study on bioaccumulation of Cu and Zn in hemolymph of males and females of A. leptodactylus. The average concentrations of Cu and Zn in the hemolymph samples were found out as 0.54 and 35.07 ppm respectively for male and 0.42 and 15.59 ppm respectively for female control freshwater crayfish. The levels of Zn in the hemolymph of both male and female ones among control and diet groups were statistically significant (P < 0.05). The Cu levels among control and diet groups in female ones were statistically significant (P < 0.05) but not in the male ones (P > 0.05). The results of current study revealed that feed treatment with boiling was not effective at the levels of metal bioaccumulation in hemolymph. It was observed that this metal bioaccumulation is more related with sex differences.

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  AtıfWoS2·OpenAlex2

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• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4301
  Column Studies on Effect of Phosphate Immobilization on Removal of Metals from Stormwater Runoff in Bioretention Cell

  Demir, V.; Bin-Shafique, S.

  Batch studies indicated that low cost native materials such as loam soil, juniper mulch, hardwood mulch, pine mulch and sawdust performed efficiently as media in bioretention cell for removal of copper and lead from stormwater runoff. Juniper mulch performed best in batch studies was used in column studies. Column studies suggested that the presence of phosphate has a pronounced effect on metal immobilization. This is due to the formation of metal phosphates that have extremely low solubility. The remaining metals were adsorbed on bioretention media of the bioretention cell. Breakthrough adsorption and desorption curves for lead and copper were measured in presence and absence of phosphate immobilization. Copper reached a breakthrough curve in around 20 days and lead in 30 days. Column studies showed that in all samples addition of phosphate also decreased the leaching of lead and copper back to aqueous solution consistent with lead and copper immobilization.

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  AtıfWoS3·OpenAlex3

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• MakaleAçık Erişim2013Scopus SJRQ4/r/munzur/4884
  Adsorption of the 2,2-Dichlorovinylphosphate on Raw and Modified Bentonites

  Yönten, Vahap; Kubilay, Senol

  This study aims to investigate the adsorption of the 2,2-dichlorovinylphosphate (DDVP) on raw and modified bentonite via high pressure liquid chromatography and infrared spectroscopy. The modified bentonites were prepared by adding HNO3 and Na2CO3. The Freundlich adsorption isotherm defines 2,2-dichlorovinylphosphate adsorption in aqueous and aqueous ethanol solutions through raw and modified bentonite. Variables such as temperature, time and pH were observed on 2,2-dichlorovinylphosphate adsorption. Then the capacity for maximum 2,2-dichlorovinylphosphate adsorption was measured on modified bentonite with HNO3 under the conditions of pH 3 and 40 degrees C. The modified bentonite with Na2CO3 clay used in experimental work played a major role on the adsorption of 2,2-dichlorovinylphosphate; thus modified bentonite with Na2CO3 is considered to possess better characteristics than modified bentonite with HNO3 and raw bentonite. The Freundlich isotherms of modified bentonite with Na2CO3 in aqueous-ethanol solution were found to be better than isotherms of aqueous solution for a much better 2,2-dichlorovinylphosphate adsorption.

  AtıfOpenAlex1

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• MakaleYalnız künye2012Scopus SJRQ4/r/munzur/3950
  Study of the Essential Oil Composition of Lallenmantia iberica (M. Bieb.) Fisch and CA Mey. (Lamiaceae) from Turkey

  Yuce, E.; Bagci, E.

  The essential, oil of wild-growing Lallemantia iberica (Lamiceae) from Turkey was obtained by hydrodistillation and analyzed by GC and GC-MS. In the oil of the Lallemantia iberica, 40 components were characterized representing 90.1 % of the total oil, with germacrene-D (36.0 %), beta-caryophyllene (18.3 %) and bicyclogermacrene (9.7 %) as the main constituents. The results showed that the analysis of essential oil composition will add some contributions on the usability of this plant as a crop and renewable resources and chemotaxonomy of the genus patterns.

  AtıfWoS2

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• MakaleYalnız künye2012Scopus SJRQ4/r/munzur/4278
  High Performance Liquid Chromatography-Mass Spectrometry for Determination of Benzo[a]pyrene in Grilled Meat Foods

  Ince, Muharrem; Yaman, Mehmet

  The concentrations and varieties of benzo[a]pyrene were determined in Turkish foodstuffs including grilled meat and chicken samples by high performance liquid chromatography-mass spectrometry (HPLC-MS). The parameters that are thought to affect the response in the HPLC-MS analysis were optimized. The optimized conditions were found to be 0.75 mL min(-1) for flow rate of mobile phase, 45 mu L for injection volume, 55 degrees C for column temperature and 140 V for fragmentor potential. The optimized method was applied for the determination of benzo[a]pyrene concentrations in grilled meat and chicken foods. The obtained concentrations were found in the range of 2.7-8.3 mu g kg(-1) for the normal grilled meat and chicken samples and 72-138 mu g kg(-1) for over-grilled samples. The results showed that the concentrations of benzo[a]pyrene were significantly dependent on the kind of meat and the cooking time and source. The limits of detection and quantitation were found to be 0.7 and 2.33 mu g L-1, respectively.

  AtıfWoS1

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• MakaleYalnız künye2012Scopus SJRQ4/r/munzur/4167
  Determination of Antioxidant Capacities of Phlomis pungens Wild. var. hispida Hub.-Mor.

  Keser, Serhat; Turkoglu, Semra; Celik, Sait; Turkoglu, Ismail

  The genus Phlomis L. belongs to the Lamiaceae family and encompasses 100 species native to Turkey, North Africa, Europe and Asia. It is a popular herbal tea enjoyed for its taste and aroma. Phlomis species are used to treat various conditions such as diabetes, gastric ulcer, hemorrhoids, inflammation and wounds. In this study, ethanol and water extracts were prepared from powdered P pungens flowers and leaves. Antioxidant activities were measured by 2,2-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS(center dot+)) radical scavenging, 1,1-diphenyl-2-picryl-hydrazyl free radical (DPPH center dot) scavenging, superoxide anion (02) radical scavenging, reducing activity and ferrous metal chelating activity assays. In conclusion, P. pungens flowers and leaves had effective ABTS(center dot+) and DPPH center dot radical scavenging, superoxide anion radical scavenging, reducing power and metal chelating activities when compared with BHA, BHT and alpha-tocopherol as reference antioxidants.

  AtıfWoS13

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• MakaleYalnız künye2012Scopus SJRQ4/r/munzur/3969
  Adsorption of the 2,4-Dichlorophenoxyacetic Acid Dimethylamine by Raw and Modified Bentonite

  Yonten, Vahap; Kubilay, Senol; Battal, Peyami

  The adsorption of the 2,4-dichlorophenoxyacetic acid dimethyl amine on raw bentonite (Tokat, Turkey), modified bentonite with base and modified bentonite with acid has been studied using high pressure liquid chromatography (HPLC) and FT- infrared spectrophotometer. Sorption of 2,4-dichlorophenoxyacetic acid dimethyl amine on raw bentonite, modified bentonite with base and modified bentonite with acid was compared solving in different solutions such as aqueous and aqueous-ethanol solutions based on adsorption isotherms. The effect of temperature, time and pH were observed on adsorption of 2,4-dichlorophenoxyacetic acid dimethyl amine. Sorption mechanisms in soils, the effect of surface functional groups as well as parameters influencing adsorption were discussed. Then maximum adsorption of 2,4-dichlorophenoxyacetic acid dimethyl amine capacity was measured on modified bentonite with base in pH 5 at 40 degrees C for 24 h. The modified bentonite with base used in experimental work played a major role than on the adsorption of 2,4-dichlorophenoxyacetic acid dimethyl amine so, the modified bentonite with base has better characteristics than raw bentonite and modified bentonite with acid adsorbents. The Freundlich isotherms of aqueous-ethanol solution was better than isotherms of aqueous solution for much better to adsorb of 2,4-dichlorophenoxyacetic acid dimethyl amine.

  AtıfWoS4

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• MakaleYalnız künye2011Scopus SJRQ3/r/munzur/4901
  Proximate Composition, Fatty Acid Profile and Mineral Content of Wild Brown Trout (Salmo trutta sp.) From Munzur River in Tunceli, Turkey

  Kayim, Murathan; Öksüz, Abdullah; Özyilmaz, Ayse; Kocabas, Mehmet; Can, Erkan; Kizak, Volkan; Ates, Mehmet

  In present study, the proximate composition, fatty acid profile and mineral content of wild brown trout living in Munzur river (Tunceli/Turkey) were investigated. The average level of protein, lipid, moisture and ash content of muscle of the wild brown trout was calculated to be 17.48, 2.3, 77.8 and 1.5 %, respectively. Thirty fatty acids were identified in this study. Identification of the fatty acid was carried out with gas chromatography-mass spectrometry (GC-MS). The total polyunsaturated fatty acids (PUPA) were found the highest fatty acid followed by that of saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA). Docosahexaenoic acid (DHA, C22:6n3) and eicosapentaenoic acid (EPA, C20:5n3), linolenic acid (LNA, C18:3n3) and linoleic acid (LA, C18:2n6) were found to be predominant fatty acids in PUFAs with the percentages of 11.25, 6.82, 6.30 and 4.88, respectively. The ratio of n3/n6 and DHA /EPA was calculated to be 4.55 and 1.65, respectively. Twelve elements were determined in this study. Determination of elements was performed with ICP-AES. P and K were the predominant element among the minerals analyzed and calculated to be 1305.56-2967.06 and 1908.68-1220.10 mg kg(-1) in muscle-skin of the wild brown trout, respectively.

  AtıfWoS8

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