Ataman, Evren
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Ataman, E
Ataman, E.
Ataman, E.
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evrenataman@iyte.edu.tr
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04.05. Department of Pyhsics
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Current Staff
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Sustainable Development Goals
1NO POVERTY
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2ZERO HUNGER
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3GOOD HEALTH AND WELL-BEING
2
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4QUALITY EDUCATION
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5GENDER EQUALITY
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6CLEAN WATER AND SANITATION
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7AFFORDABLE AND CLEAN ENERGY
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8DECENT WORK AND ECONOMIC GROWTH
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
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10REDUCED INEQUALITIES
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11SUSTAINABLE CITIES AND COMMUNITIES
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
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13CLIMATE ACTION
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
25
Citations
803
h-index
17
Documents
22
Citations
764
Scholarly Output
5
Articles
2
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417/948
Supervised MSc Theses
2
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0.00
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0.00
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3
Supervised Theses
2
| Journal | Count |
|---|---|
| Scientific Reports | 2 |
| Applied Geochemistry | 1 |
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5 results
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Now showing 1 - 5 of 5
Article A Quantitative Description of Barite Thermodynamics, Nucleation and Growth for Reactive Transport Modelling(Elsevier, 2024) Dideriksen,K.; Zhen-Wu,B.Y.; Dobberschütz,S.; Rodríguez-Blanco,J.D.; Raahauge,P.J.; Ataman, Evren; Stipp,S.L.S.The regression of available thermodynamic data in the BaSO4–NaCl–H2O system yielded Pitzer ion interaction parameters that accurately describe the activities of aqueous species and mineral solubilities in this system. This thermodynamics description is compared with published Pitzer parameter sets, and combined with a model for the kinetics of barite nucleation and growth, based on classical nucleation theory. Both the thermodynamic and nucleation/growth models have been incorporated into the PHREEQC computer code to facilitate calculation of the extent and consequences of barite formation in natural and engineered systems. Results of geochemical modelling calculations agree adequately with the amount of barite scale thicknesses derived from calliper measurements from an oil well if the effective surface free energy of barite nuclei is assumed to be ∼50 mJ m−2. Better results, however, are achieved using a temperature dependent effective surface free energy. In contrast, calculations performed by ignoring the effects of barite nucleation lead to a substantial overestimation of the amount of scale formed in our modelled systems. The success of our mineral nucleation and growth model to describe scaling in our modelled system suggests this description of precipitation rates can be applied to many other mineral-aqueous fluid systems, in particular where supersaturation is slight and the solids forming have substantial surface free energy. © 2024 Elsevier LtdMaster Thesis V Tipi Atomlarda Kuantum Girişiminin Yayınım ve Soğurma Üzerindeki Etkileri(2025) Cantürk, Halil Altuğ; Ataman, Evren; Çakır, ÖzgürKuantum optiği ve atom fiziği alanlarında, iki seviyeli atomik sistemler, radyatif geçişlerin gerçekleşebileceği en basit yapı taşlarıdır ve görece sade seviye dinamiklerine sahiptir. Ancak bu yapısal sadelik, çok seviyeli atomik konfigürasyonlarda ortaya çıkabilecek daha karmaşık ve egzotik kuantum fenomenlerinin gözlemlenmesini sınırlandırmaktadır. Bu tez kapsamında, kuantum Langevin denklemleri kullanılarak, tek frekanslı ve eşuyumlu bir alanla sürülen tek bir V-tipli üç seviyeli atomun kararlı durumdaki ışıma ve soğurma karakteristiği ile popülasyon dinamikleri incelenmiştir. V-tipli konfigürasyonun sunduğu seviye yapısı, sisteme bir kuantum girişim parametresi kazandırmakta ve radyatif geçiş yolları arasında girişim etkilerinin ortaya çıkmasına neden olmaktadır. Bu kuantum girişim etkisinin ışınım ve soğurma spektrumları üzerindeki etkileri, giydirilmiş atom resmi üzerinden ayrıntılı biçimde analiz edilmiştir.Master Thesis Interactions Between Metal Surfaces and Sulfur-Containing Amino Acids(01. Izmir Institute of Technology, 2022) Çevlikli, Mustafa; Ataman, EvrenWith Covid-19 pandemic, the scientific studies over viruses gained a big acceleration. Some of these studies show that SARS-CoV-2 can infect through direct ways from a patient. Besides that, surfaces that are contaminated from adsorption of the virus can indirectly infect a person. Because of this, the studies on the interaction between viruses and environment is an important field on virus studies. Spike proteins which project out from protective structure called lipid bilayer and they are outmost elements of SARS-CoV-2 viruses. Spike proteins play a vital role on functions like viral entry to the host cell and attachment to the surfaces. Purpose of this study is to contribute to the existing knowledge about surface interaction of these proteins which have an important role on virus-surface interactions. Because of the complicated physical and chemical form of proteins, in this study, the interaction of amino acids, which are building block of proteins, with metal surfaces are investigated. 0.01M, 0.02M and 0.05M L-cysteine and L-methionine aqueous solution was dropped to the metals frequently used in daily life, chrome (Cr) and iron (Fe) polycrystalline substrates and left to dry out at room temperature and under atmospheric conditions. Since the water solubility of L-cystine is low, only a saturated solution of Lcystine was prepared and same process was applied. After, dried out samples were analyzed with x-ray photoelectron spectroscopy (XPS). Functional sulfur groups on L-cysteine/Cr, L-methionine/Cr and L-Methionine/Fe system stayed intact. On the other hand, sulfur atoms on L-Cysteine/Fe system oxidized and formed --SO x species. While all other systems behaved oppositely, the amount of protonated functional amino species ( ) on L-methionine/Fe system decreased relative to functional amino group () with increase in coverage. Due to surface amino acid interaction of L-methionine in different substrates, binding energy of sulfur on iron was measured 1 eV lower than on chromium. In L-cystine/Cr system, while disulfide bonds stayed intact, and functional groups were observed on the surface together.Article Integrated Spectroscopic and Morphological Analyses Reveal Cellular Shifts in Gene-Silenced Melanoma CSCs(Nature Portfolio, 2025) Ozdil, Berrin; Guler, Gunnur; Ataman, Evren; Aktug, HuseyinIntratumoral heterogeneity remains a major barrier to durable cancer therapies, largely driven by the persistence of cancer stem cells (CSCs). In this study, we employed an integrated, multi-scale approach to investigate how melanoma CSCs respond to siRNA-mediated silencing of three key regulatory genes: KLF4, SHH, and HIF1 alpha. Using a combination of morphological, molecular, spectroscopic, and elemental analyses, we explored structural and biochemical consequences of gene knockdown. Gene silencing resulted in significant changes in cell shape and size, reduced F-actin organization, and decreased PFN1 expression, indicating a loss of stem-like properties. ATR-FTIR spectroscopy revealed shifts in biomolecular composition, notably a reduction in amide III intensity and an increase in lipid ester content. SEM-EDS point-based elemental analysis revealed SEM-EDS point-based elemental analysis revealed relative differences in carbon and nitrogen levels between selected central and peripheral regions of silenced and control cells, at the micron-scale working depth, reflecting broader elemental distribution trends rather than precise subcellular compartmentalization. XPS analysis further confirmed these differences, providing additional insights into the elemental composition of the cellular surface. The integration of FTIR spectroscopy into this study highlights the potential of infrared spectroscopy as a powerful tool in cancer research. These findings demonstrate that targeting critical regulatory pathways induces cytoskeletal and biochemical remodelling in melanoma CSCs, offering a multi-dimensional perspective on cellular plasticity.Erratum Correction: Integrated Spectroscopic and Morphological Analyses Reveal Cellular Shifts in Gene-Silenced Melanoma CSCs (Scientific Reports, (2025), 15, 1, (31175), 10.1038/S41598-025-17155-2)(Nature Research, 2025) Özdil, B.; Güler, G.; Ataman, E.; Aktuǧ, H.Correction to: Scientific Reportshttps://doi.org/10.1038/s41598-025-17155-2, published online 25 August 2025 The original version of this Article contained an error, where the legends of Figure 4 and Figure 5 were erroneously added in the Materials and methods section, under the subheading ‘Statistical analysis’. The duplicate legends have now been removed from the body of the text. The original Article has been corrected. © 2025 Elsevier B.V., All rights reserved.