Erzurum, Turkey
Erzurum, Turkey

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Ozdemir M.E.,AtaturkUniversity | Kavurmaci H.,Yuzuncu Yil University | Avci M.,Adiyaman University
Tamkang Journal of Mathematics | Year: 2014

In this paper, we obtain Ostrowski type inequalities for convex functions.

Kotan R.,AtatUrkUniversity | Okutucu A.,Eastern Anatolia Forestry Research Institute | Ala Gormez A.,AtatUrkUniversity | Karagoz K.,AtatUrkUniversity | And 4 more authors.
Journal of Phytopathology | Year: 2013

This study was carried out to identify pathogenic bacteria and fungi on mistletoe (Viscum album L.) and investigate their potential use in biological control of this parasitic plant. For this purpose, a total of 48 fungal isolate and 193 bacterial strains were isolated from contaminated V. album during the summers 2005-2006. The isolated bacterial strains and fungal isolates were identified by using the Sherlock Microbial Identification System (MIS; Microbial ID, Newark) and microscopic methods, respectively. The bacterial strains that induced hypersensitive reaction (HR) on tobacco (Nicotiana tabacum L.) and fungal isolates were tested for pathogenicity on young shoots of mistletoe by using injection methods. The pathogenic bacterial strains and fungal isolates were also tested for their activity against mistletoe using spray methods. Five bacterial strains (two Burkholderia cepacia, one each of Bacillus megaterium, Bacillus pumilus and Pandoraea pulminicola) were HR and pathogenicity positive when injected but none of them when sprayed on mistletoe. When fungi were injected, 32 isolates were pathogenic but only thirteen when sprayed on mistletoe. Alternaria alternata VAŞ-202, VAŞ-205, VAŞ-217 and Acremonium kiliense VA-11 fungal isolates were the most effective ones and caused strong disease symptoms on mistletoe. The present study is the first report on the efficiency of potential biocontrol agents against mistletoe in Turkey. © 2012 Blackwell Verlag GmbH.

Medhat M.E.,Nuclear Research Center - Negev | Medhat M.E.,CAS Institute of High Energy Physics | Shan W.,Aerospace Space Center Hospital | Kurudirek M.,AtaturkUniversity
X-Ray Spectrometry | Year: 2015

The objective of the proposed work was to measure concentration of six essential elements, Ca, Cu, Fe, Mn, Sr, and Zn directly in whole blood. The adopted method is based on the theory of attenuation of low energy photons through the whole blood sample. Photons are completely absorbed at energy region approximately (25-100keV), of K-absorption edge for especially low-Z elements and at L-absorption edge especially for high-Z elements. Children, adults, and old people from whom the blood samples are taken are considered as subjects in this study. The aim of this work is not to investigate any disease or specific elemental changes. Blood samples were irradiated by 22.0, 31.0, and 59.5keV photons emitted by 108Cd (1.78GBq), 133Ba (2.92GBq), and 241Am (2.78GBq) radioactive point source. A high resolution high pure germanium spectrometer has been used to detect low energy photons with low counts peaks. When compared to the existing data in literature, it has been found that the results obtained in this study agree well with those reported. There are many advantages of this technique over other methods such as being practical, inexpensive, non-destructive, and can also do analysis fast. © 2015 John Wiley & Sons, Ltd.

Balci M.,Bayburt University | Nalbant M.O.,Bayburt University | Kara E.,Bayburt University | Gundogdu O,AtaturkUniversity
International Journal of Automotive and Mechanical Engineering | Year: 2014

This study presents a free vibration analysis of a laminated composite beam, based on the Euler-Bernoulli beam theory. A numerical model of the laminated composite beam was obtained for various boundary conditions based on different length-to-thickness ratios for a number of layers, using the finite element method. A planar beam bending element with two nodes, each having two degrees of freedom, was chosen according to Euler-Bernoulli beam theory. The natural frequencies of the laminated composite beam were obtained for each case, and presented in such a way as to display the effect of these changes on the natural frequencies. Eight natural frequencies of clamped-free, clamped-clamped (CC) and simple-simple (SS) composite beams were first obtained for different length-to-thickness ratios (Lx /h), numbers of layers, layer angles and for their different positions. It can be seen that natural frequencies decrease for all modes with increasing length-to-thickness ratio in all cases. © Universiti Malaysia Pahang.

Nadaroglu H.,AtaturkUniversity | Kalkan E.,BayburtUniversity | Celebi N.,AtaturkUniversity | Tasgin E.,Atatürk University
Clay Minerals | Year: 2015

In this study, a clinoptilolite modified with apolaccase was used to adsorb Reactive Black 5 (RB5) dye from aqueous solution using the batch procedure. The influences of pH, contact time, temperature and absorbent dosage on the adsorption were investigated. The optimum adsorption was obtained at pH = 6, contact time = 60 min, temperature = 25°C and adsorbent dosages of 1.62 and 1.59 mg/50 mL per gram of clinoptilolite and of apolaccase-modified clinoptilolite (LMC), respectively). The adsorption experimental data fitted both the Langmuir and Freundlich isotherm models well. In addition, pseudo-first-order and pseudo-second-order kinetics were used to study the kinetics of RB5 dye adsorption onto natural clinoptilolite and LMC. Adsorption appears to follow pseudo-second-order kinetics with a high correlation coefficient. Thermodynamic parameters such as changes in the free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) of adsorption were calculated. The thermodynamic parameters indicate that the adsorption of RB5 dye onto LMC was less spontaneous, feasible and endothermic. The LMC can be used as an alternative low-cost adsorbent for the dye removal from aqueous solutions. © 2015 Mineralogical Society 2015.

Nadaroglu H.,AtaturkUniversity | Kalkan E.,BayburtUniversity | Celebi N.,AtaturkUniversity | Tasgin E.,Atatürk University
Clay Minerals | Year: 2015

Non-isothermal dehydration kinetics of a heulandite-type zeolite-rich tuff from Turkey was investigated using thermogravimetric data recorded at three different heating rates (5, 10 and 20°C/min) under nitrogen flow. Isoconversional model-free methods gave a constant activation energy over the temperature range 30-200°C suggesting that the dehydration is a single-step process within this temperature range. The apparent activation energy was determined as: 34.54±1.18, 30.99±1.14 and 27.79±1.42 kJ/mol by the Flynn Wall Ozawa, the Kissinger Akahira Sunose and the Friedman methods, respectively. The activation energy values determined were less than the activation energy for vaporization of bulk water, indicating control of the dehydration rate by diffusion of water within this temperature range. © 2015 Mineralogical Society 2015.

PubMed | Bozok University and AtaturkUniversity
Type: | Journal: Acta radiologica (Stockholm, Sweden : 1987) | Year: 2016

Different non-invasive imaging techniques such as Doppler ultrasonography and renal scintigraphy are commonly employed to assess allograft function and associated complications. However, all such methods lack sufficient specificity to discriminate between residual renal function of native kidneys. Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) evaluates signal dynamics during the passage of contrast material through the renal cortex, medulla, and collecting system.To investigate the value of DCE 3T MRI using a quantitative pharmacokinetic parameter (Ktrans) for the assessment of native kidneys before and after pre-emptive renal transplantation.Twenty-five consecutive patients with end-stage renal disease underwent DCE MRI before and 6 months after kidney transplantation. MRI was performed using a 3T scanner. Regions of interests were drawn over each kidney, encompassing the cortex and medulla but excluding the collecting system and any coexisting cysts. Parametric Ktrans values were automatically generated.In the pre-transplantation group, mean Ktrans values for the right and left kidneys were 0.550.09minOur preliminary results show that native kidneys were still functioning 6 months after transplantation. MR perfusion using Ktrans may constitute a non-invasive means of determination of the viability of native kidneys after renal transplantation.

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