Agri Ibrahim Cecen University
Agr, Turkey

Ağrı İbrahim Çeçen University is a public higher educational institution located in Ağrı, Eastern Anatolia in Turkey. It was formerly the Faculty of Education linked to the Atatürk University of Erzurum.In 2007, the facility was developed to a university named Ağrı Dağı University . The university was later renamed following a protocol signed between the government and a local businessman and philanthropist İbrahim Çeçen.The university has six faculties, two institutes, five colleges, five vocational schools and five research and application centers. The university has two campuses old one is near city center and includes health related schools, and the main campus is located on side of highway to Erzurum. Wikipedia.

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Uruc Parlak K.,Agri Ibrahim Cecen University | Demirezen Yilmaz D.,Erciyes University
Ecotoxicology and Environmental Safety | Year: 2012

In the plants, Lemna gibba, Lemna minor and Spirodela polyrrhiza L., the effect of different concentrations of zinc (0.01, 0.05, 0.1, 0.5 and 1.5mgL-1 Zn) applied for four day was assessed by measuring changes in the chlorophyll, protein, malondialdehyde (MDA), catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) and guiacolperoxidase (GPX) activity of the plants. According to results, Zn contents in plants increased with increasing Zn supply levels. The level of photosynthetic pigments and soluble proteins reduced only upon exposure to high Zn concentrations. At the same time, the level of malondialdehyde (MDA) increased with increasing Zn concentration. These results suggested an alleviation of stress that was possibly the result of antioxidants such as catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) as well as guaiacol peroxidise (GPOX), which increased linearly with increasing Zn levels. Cellular antioxidant levels showed an increase suggesting a defensive mechanism to preserve against oxidative stress given rise to by Zn. Besides, the proline amount in L. gibba, L. minor and S. polyrrhiza increased with increasing zinc levels. These conclusions proposed that L. gibba, L. minor and S. polyrrhiza are supplied with an efficient antioxidant mechanism against Zn-induced oxidative stress which saves the plant's photosynthetic machinery from damage. It is concluded that higher zinc levels cause oxidative stress in L. gibba, L. minor and S. polyrrhiza cells and may reason membrane damage through production of ROS and interferes with chlorophyll metabolism. © 2012 Elsevier Inc.

Mann K.S.,DAV College Kanpur | Korkut T.,Agri Ibrahim Cecen University
Annals of Nuclear Energy | Year: 2013

The gamma ray buildup factors for six silicate samples have been calculated, in the energy range of 0.015-15 MeV for penetration depths up to 100 mfp (mean free path), using five parameters based geometric progression (G-P) fitting formula with modified expression for dose multiplication factor [K(E, x)]. The computations were done using ANSI/ANS 6.4.3-1991 (American National Standard). The extrapolation to the buildup factors of the selected samples beyond 40 mfp and up to 100 mfp in this energy range are new to the available literature. Calculated buildup factors of water have been shown good agreement with the available standard data. The obtained results for all samples have been compared and verified by using WinXCom software and GEANT4 Monte Carlo simulations. © 2012 Elsevier Ltd. All rights reserved.

Gulcin I.,Atatürk University | Gulcin I.,Agri Ibrahim Cecen University
Journal of Medicinal Food | Year: 2011

Eugenol (4-allyl-2-methoxyphenol), a major phenolic component from clove oil (Eugenia caryophyllata), has several biological activities. To estimate the capacity of eugenol to act as an antioxidant, the following were studied: 1,1-diphenyl-2-picryl-hydrazyl-, 2,2′-azino-bis(3-ethylbenzthiazoline-6- sulfonic acid)-, and N,N-dimethyl-p-phenylenediamine-scavenging activity; total antioxidant activity; and ability to reduce ferric ions and cupric ions. Eugenol inhibited 96.7% (r 2=0.9319) lipid peroxidation of a linoleic acid emulsion at a 15-μg/mL concentration. Butylated hydroxyanisole, butylated hydroxytoluene, α-tocopherol, and Trolox ® displayed 95.4% (r 2=0.8482), 99.7% (r 2=0.7798), 84.6% (r 2=0.9272), and 95.6% (r 2=0.8511) inhibition of peroxidation, respectively, at the 15-μg/mL concentration. According to the results of this study, eugenol had the most powerful antioxidant activity and radical-scavenging activity. This study should prompt further studies of the antioxidant properties of eugenol. © Copyright 2011, Mary Ann Liebert, Inc.

Gulcin I.,Atatürk University | Gulcin I.,Agri Ibrahim Cecen University
Innovative Food Science and Emerging Technologies | Year: 2010

Resveratrol, a natural product, is known to affect a broad range of intracellular mediators. In the present study, we clarified the antioxidant activity of resveratrol by employing various in vitro antioxidant assays such as DPPH•, ABTS•+, DMPD•+, O2•- and H2O2 scavenging activities, total antioxidant activity, reducing abilities, and Fe2+ chelating activities. Resveratrol inhibited 89.1% of the lipid peroxidation of linoleic acid emulsion at 30 μg/mL concentration. On the other hand, BHA, BHT, α-tocopherol, and trolox exhibited inhibitions of 83.3, 82.1, 68.1, and 81.3% against peroxidation of linoleic acid emulsion at the same concentration, respectively. In addition, resveratrol had effective DPPH•, ABTS•+, DMPD•+, O2•- and H2O2 scavenging activities, reducing power, and Fe2+ chelating activities. The present study found that resveratrol had effective in vitro antioxidant and radical scavenging activity. It can be used in pharmacological and food industry due to its antioxidant properties. Industrial relevance: Antioxidants are often added to foods to prevent the radical chain reactions of oxidation and they act by inhibiting the initiation and propagation step leading to the termination of the reaction and delay the oxidation process. At the present time, the most commonly used antioxidants are BHA, BHT, propylgallate and tert-butyl hydroquinone. Besides that BHA and BHT are restricted by legislative rules because of doubts over their toxic and carcinogenic effects. Therefore, there is a growing interest on natural and safer antioxidants in food applications, and a growing trend in consumer preferences for natural antioxidants, all of which has given more impetus to explore natural sources of antioxidants. A variety of foods and beverages of vegetable origin contain several nonflavonoid classes of phenolic compounds synthesized by plants. Among them, resveratrol has been identified as the major active compound of stilbene phytoalexins and is presumed to be beneficial for human health. Resveratrol is naturally occurring in the fruits and leaves of edible plants, peanuts, mulberries, grapes and red wine. Resveratrol is currently in the limelight all over the world due to their beneficial effects on the human body. Resveratrol can be used for minimizing or preventing lipid oxidation in pharmaceutical products, retarding the formation of toxic oxidation products, maintaining nutritional quality and prolonging the shelf life of food products and pharmaceuticals instead of BHA and BHT and other antioxidant compounds because of their safer usage. © 2009 Elsevier Ltd. All rights reserved.

Gulcin I.,Atatürk University | Gulcin I.,Agri Ibrahim Cecen University
Archives of Toxicology | Year: 2012

Recently, there has been growing interest in research into the role of plant-derived antioxidants in food and human health. The beneficial influence of many foodstuffs and beverages including fruits, vegetables, tea, coffee, and cacao on human health has been recently recognized to originate from their antioxidant activity. For this purpose, the most commonly methods used in vitro determination of antioxidant capacity of food constituents are reviewed and presented. Also, the general chemistry underlying the assays in the present paper was clarified. Hence, this overview provides a basis and rationale for developing standardized antioxidant capacity methods for the food, nutraceutical, and dietary supplement industries. In addition, the most important advantages and shortcomings of each method were detected and highlighted. The chemical principles of these methods are outlined and critically discussed. The chemical principles of methods of 2,2′-azinobis- (3-ethylbenzothiazoline-6-sulphonate) radical (ABTS •+) scavenging, 1,1-diphenyl-2-picrylhydrazyl (DPPH •) radical scavenging, Fe 3+-Fe 2+ transformation assay, ferric reducing antioxidant power (FRAP) assay, cupric ions (Cu 2+) reducing power assay (Cuprac), Folin-Ciocalteu reducing capacity (FCR assay), peroxyl radical scavenging, superoxide anion radical (O 2 •- ) scavenging, hydrogen peroxide (H 2O 2) scavenging, hydroxyl radical (OH •) scavenging, singlet oxygen ( 1O 2) quenching assay and nitric oxide radical (NO •) scavenging assay are outlined and critically discussed. Also, the general antioxidant aspects of main food components were discussed by a number of methods which are currently used for detection of antioxidant properties food components. This review consists of two main sections. The first section is devoted to main components in the foodstuffs and beverages. The second general section is some definitions of the main antioxidant methods commonly used for determination of antioxidant activity of components in the foodstuffs and beverages. In addition, there are given some chemical and kinetic basis and technical details of the used methods. © 2011 Springer-Verlag.

Un A.,Agri Ibrahim Cecen University
Radiation Physics and Chemistry | Year: 2013

Effective atomic numbers, effective electron densities for photon mass energy absorption and kerma values of soft tissue and some thermoluminescence dosimeter containing boron are calculated in the energy range from 1. keV to 20. MeV. It is investigated that the variation of effective atomic numbers, effective electron densities and kerma with energy. The TL dosimeters studied are compared with the soft tissue for calculated values. In addition, dopant effect on the effective atomic numbers and electron densities for photon mass energy absorption and kerma values of the TL dosimeter containing boron is presented. Effect of the concentrations of the element H on effective electron density of the soft tissue is discussed. © 2012 Elsevier Ltd.

Yalcin F.A.,Agri Ibrahim Cecen University
Chemistry Education Research and Practice | Year: 2012

The aim of this study was to explore pre-service primary teachers' understandings of the effect of temperature and pressure on the solid-liquid phase transition of water. In the study a survey approach was used, and the sample consisted of one-hundred and three, third year pre-service primary science teachers. As a tool for data collection, a test composed of five open-ended questions was used. In addition, semi-structured interviews were conducted with four purposefully selected students. All interview records were transcribed and analyzed with respect to the students' misunderstandings. The results show that there were common misunderstandings in the students' written responses. The statistical analysis indicated that the chi square statistic calculated is significant at a level of 0.05, suggesting that the observed frequency differences among categories are not due to chance. It is believed that the results of the study carry valuable knowledge for researchers and teacher educators. This journal is © The Royal Society of Chemistry.

Doganlar Z.B.,Agri Ibrahim Cecen University
Water, Air, and Soil Pollution | Year: 2012

The effects of a five-pesticide mixture on pesticide accumulation, phytohormone levels (indole- 3-acetic acid, gibberellic acid, jasmonic acid, and salicylic acid), pigment contents (total chlorophyll and carotenoid), antioxidant enzyme (catalase and guaiacol peroxidase) activities, lipid peroxidation product (malondialdehyde), and DNA profiles were investigated in the leaves of Veronica beccabunga. Laboratoryacclimatized plants were treated with a mix of five pesticides (atrazine, disulfoton, chlorpyrifos, metalaxyl, and ethion) in doses of 50 ppt, 1 ppb, 100 ppb, and 1 ppm for 1, 3, and 6 days. The accumulation of each pesticide, from highest to lowest, was as follows: chlorpyrifos, atrazine, metalaxyl, disulfoton, and ethion. The amounts of total chlorophyll and protein decreased with increased pesticide concentration. Antioxidant enzyme activities and malondialdehyde amount increased linearly with increasing pesticide exposure. However, the highest pesticide concentration caused decreases in guaiacol peroxidase (POD) activity and malondialdehyde (MDA) content at all treatment times. Both jasmonic and salicylic acid levels increased with pesticide exposure and decreased gradually after. It was also determined that application of the pesticide mixture affected the DNA profiles of V. beccabunga. The most band changes were detected on the sixth day of treatment. © Springer Science+Business Media Dordrecht 2012.

Doganlar Z.B.,Agri Ibrahim Cecen University
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2012

In this study, the effects of the herbicide, quizalofop-p-ethyl, on pigment contents (total chlorophyll, chlorophyll a/b, carotenoid), antioxidant enzyme [superoxide dismutase (SOD) and guaiacol peroxidase (POD)] activities, lipid peroxidation product (malondialdehyde: MDA) and DNA profiles were investigated in Lemna gibba and Lemna minor. Laboratory-acclimatized plants were treated with quizalofop-p-ethyl at 31.375, 62.75, 125 and 250 mg L-1 for 24 and 96 h. It was determined that quizalofop-p-ethyl affected both the physiological status and the DNA profiles of L. gibba and L. minor. The photosynthetic pigments of L. gibba were more sensitive to the herbicide than were those of L. minor at both treatment times. SOD and POD activities were elevated in both plants at 24 h. However at 96 h, SOD activity decreased in L. minor and had irregular changes in L. gibba.. Significant increases in the amounts of MDA were observed in L. gibba, whereas the levels of this compound decreased in L. minor at 24 and 96 h. Polymorphism in DNA profiles was determined using the Random Amplified Polymorphic DNA (RAPD) technique. Four primers were used for scoring (appearance and disappearance of DNA polymorphic bands), and equally weighted maximum parsimony analyses were performed. Fewer differences were observed at 24 h, and more new bands were observed at 96 h in L. gibba. The RAPD profiles of L. minor produced by all of the primers were slightly less affected by the herbicide treatment than were those of L. gibba. Copyright © Taylor & Francis Group, LLC.

Korkut T.,Agri Ibrahim Cecen University
Annals of Nuclear Energy | Year: 2014

Nuclear graphite is exclusively produced as a moderator and reflector material in nuclear industry. It has low density, high strength, low thermal expansion, high thermal conductivity, high hardness and good thermal resistance. We simulated graphite structure in a box using LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator) to obtain heat flux, atomic displacements, pressures and total energy values for 300 K (room temperature), 1273 K (gas-cooled reactor operating temperature) and graphite temperatures in the reactor (from 573 K to 1123 K). Also boron coated graphite (BCG) was investigated by the same method and to estimate the same parameters. © 2013 Elsevier Ltd. All rights reserved.

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