Chelating agents like ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and nitrilotriacetic acid (NTA) find extensive application in the removal of residual substances due to their high stability constants with a wide range of metal ions. They also play a crucial role in nuclear decontamination operations aimed at eliminating metallic radionuclides such as 60Co, 90Sr, and 239Pu. However, improper disposal of chelated radioactive waste can lead to significant increases in radionuclide migration rates from disposal sites. Therefore, it is imperative to comprehend the behavior of chelating agents under varying conditions, including pH, temperature, and metal ion concentrations. In this study, we present the results of a pH-dependent composition analysis of nickel-chelate complexes using UV-Vis spectrophotometry. Nickel (Ni) serves as an ideal metal ion for investigating its interactions with chelating agents due to its solubility over a wide pH range and high stability constants with all three chelating agents mentioned earlier. Initially, UV-Vis spectra of Ni-EDTA, Ni-DTPA, and Ni-NTA complexes were recorded at various pH levels. We assigned absorption maxima and compared our findings with existing literature on each Ni-chelate complex. Furthermore, we examined mixed samples of all three complexes, varying the pH to monitor changes in composition. The results and their implications will be presented in our poster presentation.

A comprehensive understanding of actinide coordination chemistry and its structure is essential in many aspects of the nuclear fuel cycle, such as fuel reprocessing, waste management, reactor safety, and non-proliferation efforts. Managing radioactive waste generated during the nuclear fuel cycle has recently become more important, accordingly increasing the importance of designing appropriate waste forms and storage solutions for long-term waste disposal. Compared to the increase in the need for understanding the chemistry of major radioactive elements, the information on the local structure of the radioactive elements, especially actinides, remains unknown. To probe this issue, X-ray absorption fine structure (XAFS) can be applied. By analyzing the EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge structure), the local structure around atoms can be determined. However, the radioactive properties of the nuclides hindered the measurement of EXAFS and XANES, due to the difficulties of preparation, containment, and transfer of the sample. To measure the EXAFS of various compounds regarding the back-end nuclear fuel cycle, laboratory-based EXAFS (hiXAS, HP spectroscopy) has been introduced which can measure the EXAFS and XANES at the energy range of 5-18 keV. Compounds of Copper (Cu foil, CuO samples), Zirconium (Zr foil), and Europium (Eu2O3) were used for the verification of the laboratory -based EXAFS at a given energy range. The measured EXAFS spectrum of various compounds exhibit good agreement with the theoretical data, showing an R-factor of less than 0.02. It was found that each graph has a first peak corresponding to 2.55Å for Cu foil (Cu-Cu), 1.93Å for CuO samples (Cu-O), 3.23Å for Zr foil (Zr-Zr), and from 2.32Å to 2.34Å for Eu2O3 (Eu-O), which agree well with other values from the literature. From the result, it can be implied that this equipment can be used especially in the back-end nuclear fuel cycle field to enhance the understanding of local structure in radiochemistry.

This study will investigate the effects of induced awe on ethical tourist behavior. The positive emotion of awe has not been fully investigated in the context of tourism. This study will fill the gap by conducting an experimental design. The purpose of this study is to identify a message type that appeals to awe effectively. This study will be built on the construal theory. We will use a 2 (emotion: positive awe vs. negative awe) × 2 (message appeal: desirability vs. feasibility) between-subject design in study 1 and a 2 (emotion: positive awe vs. negative awe) × 2 (message appeal: desirability vs. feasibility).

Corporations, governments, and non-profits across the world have implemented proenvironmental campaigns to promote sustainable practices. To better understand crosscultural differences in environmental persuasion, we draw on research on self-conscious emotion (Tangney & Dearing, 2002), construal level theory (Trope & Liberman, 2010), and cultural psychology (Ratner, 2000). The current research examines how the emotions of guilt and shame cause people from Eastern and Western cultures to differently perceive green advertising messages that are framed concretely or abstractly. Two hundred fifty-five undergraduate students were randomly assigned to a 2 (emotion priming: guilt vs. shame) x 2 (construal message frame: abstract vs. concrete message) x 2 (nationality: Americans vs. Koreans) between-subjects design. The results indicate that message concreteness effect is present among guilt-primed Americans and shame-primed Koreans (culturally relevant), but absent among shame-primed Americans and guilt-primed Koreans (culturally irrelevant). Theoretical and practical implications are discussed for developing global green advertising message strategies.

다능성 세포를 포함하는 골막은 골모세포와 연골세포로 분화될 수 있다. 그리고 배양된 골막유래세포는 골형성 능 력을 가지고 있다. 이 연구의 목적은 골막유래 세포들과 골이식재 간의 상호작용을 평가하는 것이다. Sprague-Dawley 랫드의 두개골 골막에서 세포를 분리한 다음, 배양된 골막유래세포를 beta-tricalcium phosphate (β-TCP)와 함께 임계결손부 크기의 두개결손부에 이식하였다. 모든 랫드는 골이식 수술 후 8주째에 희생되었으며, 골이식부의 골형성 능력은 일반방사선, micro CT 및 조직검사를 통해 평가되었다. β-TCP와 함께 이식된 골막유래세 포는 골결손부에서 더욱 증가된 석회화작용을 나타내었으며, 골결손부 안쪽 및 가장자리에 골밀도 증가와 신생골이 형 성되었다. 특히 골막유래세포는 β-TCP만 단독으로 이식하였을때보다 함께 이식 시 효과적으로 신생골을 형성하였다. 이러한 결과는 배양된 골막유래세포가 골결손부에서 골형성을 증진시킬 수 있는 가능성을 보였다.

CT는 단층촬영을 이용한 의학적인 영상 진단 기법이다. CT는 3차원적인 방사선학적 영상 기법으로 염증의 평가에는 적합하지 않으나, 석회화된 조직을 직접적인 3차원 영상으로 보여주므로 뼈 손상의 평가에는 유용하 다. 본 연구는 실험적으로 유도된 랫드의 보조관절염에서 관절의 병리학적 변화와 뼈 파괴의 정량적 분석을 3 차원 CT 영상을 통하여 평가하고자 실시되었다. 그 결과 랫드의 보조관절염에서 병변의 파괴성 진행이 3차원 CT 영상을 통해 정량화될 수 있었고, 따라서 관절염 질환의 상태 및 실험적인 치료 약제의 효능 평가에 3차원 CT 영상 기법이 효과적일 것으로 생각된다.