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Computed Tomography Routine Examinations and the Related Risk of Cancer

100%
Kara Ü., Tekın H., Akkurt I.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
409-411
EN
Computed tomography is an imaging process that uses x-ray equipment to create detailed scans, of areas inside the body. A picture created during computed tomography process shows the organs, bones, and other tissues in a thin "slice" of the body. Computed tomography is used in cancer diagnosis in many different ways to detect abnormal growths, helps to diagnose the presence of a tumor, provides information about the stage of cancer, determines exactly where to perform a biopsy procedure. The x-rays, gantry around the head, chest or another body part, helps to make a three-dimensional image that is much more detailed than pictures from other x-ray machines. Computed tomography imaging involves the use of x-rays, which are a form of ionizing radiation. Exposure to ionizing radiation is known to increase the risk of cancer. The aim of this study was to assess the radiation exposure received during computed tomography in a representative sample of patients.
2
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Nitrogen Source, an Important Determinant of Fatty Acid Accumulation and Profile in Scenedesmus obliquus

100%
Yilancioğlu K., Tekın H., Cetıner S.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
428-433
EN
The potential of algae-based fuel technologies for manufacturing renewable biofuels has been attracting interest from the scientific community. Biomass productivity and cellular lipid content are important parameters affecting the feasibility of using algae oil for biodiesel production. This study compares utilization of NaNO₃, NH₄Cl and urea as different nitrogen sources in terms of their effects on biomass productivity, fatty acid profile and accumulation in Scenedesmus obliquus. Cellular lipid accumulation was analyzed by gravimetric, fluorometric, and flow-cytometric methods, besides collecting spectrophotometric data for biomass productivity analysis. In addition, fatty acid profiles were compared by using gas chromatography-mass spectrometry. The alga can utilize all tested nitrogen sources successfully however growth rates demonstrate differences. Gravimetric lipid content analysis showed approximately a ≈1.5-fold increase in total lipid accumulation under NH₄Cl regime when compared to that of NaNO₃ and a ≈ 2-fold increase when compared to that of urea at the end of ten days cultivation course. Fatty acid profiles under different nitrogen regimes present variations especially under NH₄Cl regime. Moreover, all lipid extracts mostly consist of saturated, straight- and branched-chain hydrocarbons of different chain lengths ranging from C16-C20 which grant a suitable profile for biodiesel production. Scenedesmus obliquus is a suitable species for biodiesel production. The results obtained from this study provide a better understanding of cultivation characteristics of this important species and support potential, future biodiesel production.
3
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Quantitative Characteristic X-Ray Analysis for Different Compound Samples by Using Monte Carlo Method

100%
Tekın H., Altunsoy E., Manici T., Yilmaz B.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
439-441
EN
X-ray spectrometry is an elemental analysis technique with broad application in science and industry. It is based on the principle that individual atoms, when excited by an external energy source emit X-ray photons of a characteristic energy or wavelength. Here we obtained the characteristic X-ray peaks of different brass compounds and compared the intensity of characteristic peaks by changing with Zn rate. In this study we modelled different brass samples by using Monte Carlo method and changed the zinc rate in brass samples for each compound. We obtained the characteristic X-ray peaks of different compounds and compared the intensity of characteristic peaks by changing with Zn rate. We achieved a good agreement between peak intensity and corresponding element rate in compound. Also we obtained that characteristic peak rate increases by corresponding element rate in compound. This study shows that Monte Carlo method is very effective method to simulate material features due to their characteristic peaks and their intensities.
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