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12-Crown-4, 15-Crown-5 및 18-Crown-6에 의한 Eu(Ⅲ) 및 Tb(Ⅲ)의 용매추출
김은정,윤수경,배준현,강준길,김연두,Kim, Eun-Jeong,Yoon, Soo-Kyung,Bae, Jun-Hyun,Kang, Jun-Gil,Kim, Youn-Doo 대한화학회 1995 대한화학회지 Vol.39 No.4
12-crown-4, 15-crown-5 및 18-crown-6 에테르들을 리간드로 사용하여 수용액에서 $Eu^{3+}$ 및 $Tb^{3+}$ 이온들을 ethylacetate 혹은 dichloromethane층으로 추출하였다. 이들간에 형성된 착물의 반대이온으로 benzoate 이온을 선택하였다. Benzoate 이온으로부터 란탄족 금속이온으로의 에너지 전달에 의하여 유도되는 형광스펙트럼을 역시 측정하였다. 이 결과를 바탕으로 유기용매층에 추출된 란탄족 금속이온들을 형광분석 방법으로 정량할 수 있었다. 측정된 추출율을 이온-쌍극자 상호작용 함으로써 논하였다. The extractions of aqueous Eu3+ and Tb3+ ions into ethylacetate or dichloromethane were conducted by using 12-crown-4, 15-crown-5 and 18-crown-6 ethers as ligand. Benzoate ion was selected as counter anion for the complexes formed between the lanthanide ions and crown ethers. Fluorescence spectra of the lanthanide ions induced by the energy transfer from benzoate anion to the cations were also measured. The quantitative analysis of the lanthanide ions extracted into organic phase were made on the basis of the results of fluorescence. The measured extractivity is interpreted in terms of the ion-dipole interaction.
정신분열병 환자에서 가상현실을 이용한 추론과제 수행 중 활성화된 뇌영역과 현존감과의 관계 : 기능자기공명영상 연구
최수희,김재진,박일호,김소영,구정훈,이형래,윤강준,김인영,김선일 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.3
Objectives : Virtual reality has been increasingly used in the psychiatric field. Presence, the sense of “being there,” is an essential concept in terms of the effectiveness of the virtual reality. The present study aimed to investigate the characteristics of the presence-related brain regions in patients with schizophrenia. Methods : Using fMRI, brain activities were measured while performing the virtual reality tasks m fifteen healthy normal subjects and fifteen patients with schizophrenia. The tasks consisted of listening to some stories and inferring the content of the previous events. Ambiguous information was given for the experimental task, whereas clear information was given for the control task. Correlations between the image contrast values and the presence scores were analyzed. Result : The presence-related brain regions in healthy controls were identified in the two discrete region groups that could be referred to as the cognitive neural correlates and the perceptual neural correlates. The former included the anterior cingulate, the left inferior temporal gyrus, the right lingual gyrus, and the right cuneus, whereas the latter consisted of the right posterior cingulate, the left lingual gyrus and the right fusiform gyrus. Compared with healthy controls, regional correlation patterns were different in patients with schizophrenia, including that the posterior cingulate had significant correlations. Conclusion : These results suggest that patients with schizophrenia utilize perceptual apparatus for the presence more than the cognitive aspect. A peculiar pattern of the presence in schizophrenia may be related to increased correlations between the posterior cingulate and other brain regions.