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1
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Energy Levels and Atomic Lifetimes of Rydberg States in Neutral Indium

100%
Yildiz M.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 1
25-30
EN
Atomic lifetimes and energy levels were calculated using weakest bound potential model theory for 5 s^2 ns ^2 S_{1/2} (n ≥ 6), 5 s^2 np ^2 P^0_{1/2} (n ≥ 5), 5 s^2 np ^2 P^0_{3/2} (n ≥ 5), 5 s^2 nd ^2 D^0_{3/2} (n ≥ 5), 5 s^2 nd ^2 D^0_{5/2} (n ≥ 5) series of the Rydberg states in neutral indium. The use of the quantum defect method and Martin's expression allowed us to supply lifetime values along by means of the series above. Some lifetimes and energy values not existing in the literature for high Rydberg states in neutral indium atom were obtained using this method. Our results nicely agree with the available experimental results and theoretical results.
2
Content available remote

Investigation of Radiation Exposure Dose from Nuclear Medicine Procedures (Tc-99m MAG-3)

51%
Kara U., Yildiz M., Akkurt I.
Acta Physica Polonica A
|
2017
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vol. 132
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issue 3
883-885
EN
Nuclear medicine is great for viewing the roles of body organs. Medical imaging in nuclear medicine takes radioactive pharmaceuticals and studies their path of progress through patient's body. The principles of nuclear medicine are different from those of diagnostic radiology. The nuclear medicine can study the functioning of body and how it actually works. On the other hand, usage of different kinds of radiopharmaceuticals in nuclear medicine examinations can affect the dose rates. The purpose of our investigation was to estimate the effective dose from most common procedures, performed in nuclear medicine departments. We noted the injection radiation doses, which are used for diagnosis in nuclear medicine clinics. Later patient radiation doses were calculated, according to models recommended in ICRP 106.
3
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Radiative Lifetimes of Rydberg States in Neutral Gallium

51%
Yildiz M., Çelık G., Kiliç H.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 3
641-646
EN
Radiative lifetimes were calculated using weakest bound electron potential model theory for 4s^{2} ns ^{2}S_{1/2} (n ≥ 7), 4s^{2} np ^{2}P^{0}_{1/2} (n ≥ 5), 4s^{2} np ^{2}P ^{0}_{3/2} (n ≥ 6), 4s^{2} nd ^{2}D^{0}_{3/2} (n ≥ 6), 4s^{2} nd ^{2}D ^{0}_{5/2} (n ≥ 6) series in neutral gallium. The use of the quantum defect theory and Martin's expressions allowed us to supply lifetime values along by means of the series above. The results obtained in this work presented good agreement with theoretical and experimental values. Moreover, some lifetime values not existing in the literature for highly excited Rydberg states in gallium atom were obtained using this method.
4
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The Measurement of Gamma Dose in Radiotherapy Unit

51%
Akkurt İ., Kara Ü., Yildiz M., Kaya V.
Acta Physica Polonica A
|
2015
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vol. 128
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issue 2B
B-367-B-369
EN
Cancer is one of the most deadly diseases posing threat for our health. The most important method for eradicating of cancer cells is photoradiotherapy. Electrons accelerated by the accelerator are converted to photons in the process of bremsstrahlung. These photons are focused on diseased cells. Photon leaving accelerator head should assure a given dose intensity in cancer cells. Measuring of beam parameters at apparatus output is essential to determine the dose. In this study, Suleyman Demirel University research and education hospital in radiation Oncology department which has located at 18 MeV accelerator in energy gamma dose was measured.
5
Content available remote

Effects of Thymol and Carvacrol on Acetylcholinesterase from Drosophila melanogaster

51%
Askin H., Yildiz M., Ayar A.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 3
720-722
EN
In this study, inhibitor effects of thymol and carvacrol were investigated in vivo and in vitro on acetylcholinesterase enzyme of Drosophila melanogaster. IC₅₀ values, Ki constants and inhibition types were determined for the substances displaying inhibitory effect. In vivo studies, were performed on larvaes by considering IC₅₀ values. The surviving and mortality rates were determined for the solution applied to larvaes. IC₅₀ values of thymol and carvacrol were found to be 25 mM and 0.175 mM, respectively. By using Lineweaver-Burk graphs, it was found that both compounds show non-competitive type of inhibition. According to results, it was concluded that carvacrol is a more effective inhibitor than thymol. We believe that these findings will contribute to the development of more potent, specific and effective inhibitors against AChE enzyme, design of new drugs for treating Alzheimer's disease and studies in pharmacological applications.
6
Content available remote

Determination of Excited-State Ionization Potentials for Lithium-Like Sequence Using Weakest Bound Electron Potential Model Theory

51%
Çelik G., Yildiz M., Ş. Kiliç H.
Acta Physica Polonica A
|
2007
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vol. 112
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issue 3
485-494
EN
In this work, the theoretical calculation of excited-state ionization potentials for 1s^22_p ^2P_{1/2}, 1s^23_s^2S_{1/2}, 1s^23_d^2D_{1/2}, 1s^24_s^2S_{1/2}, 1s^24_p^2P_{1/2}, and 1s^24_d^2D_{1/2} iso-spectrum series of lithium-like elements were carried out using a weakest bound electron potential model theory for nuclear charges from Z=3 to Z=18. The Breit-Pauli approximation was used for relativistic contributions. The obtained values are compared with the experimental results from literature. The overall agreement between data obtained in this work and experimental data from literature can appear to be quite good being generally within 0.1% of experimental values.
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