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N₂O₃계 거대고리 리간드와 전이금속 이온과의 착물 형성에 관한 연구
최규성,박휴범,유한준 慶南大學校 附設 基礎科學硏究所 1992 硏究論文集 Vol.4 No.-
The stability constants of the complexes of transition metal ions(Co²+, Ni²+, Cu²+, and Zu²+) with N₂O₃-donor macrocyclic lignads such as 1,15-diaza-3,4 : 12,13-dibenzo-5,8,11-trioxacy-cloheptadecane(NenOdienH₄)and 1,15-diaza-3,4 :12, 13-dibenzo-5, 8, 11-trioxacyclooctade-cane( NtnOdieH₄)have been determined by polarographic method in MeOH solution at 25℃. From the results, the followings have been obstained, 1. In MeOH solution, transition metal ions from a 1:1 complex with these ligands. 2. The order complex stability constants of transition metal ions these ligands is Co(II) < Ni(II) <Cu(II) < Zn(II), the same as the natural order of stability proposed by Williams-Irving. 3. The order of stability constants of Ni(II), Cu(II) ions is NenOdienH₄> NtnOdienH₄, of Co(II), Zn(II) ions is NenOdienH₄< NtnOdienH₄.
Park Hyu-Bum,Huh Hwang,Kim Si-Joong Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.2
Some perovskites $A($Cu_{1}3}Nb_{2}3}$)O_3(A=$Sr^{2+}$$, $Ba^{2+}$ and $Pb^{2+}$) and their series of mixed perovskites have been prepared by solid state reaction. Single perovskite phase was obtained in Sr or Ba rich samples, but pyrochlore phase was found in Pb rich samples. The stability of perovskite phase is dependent on the ionicity of bonding as well as the tolerance factor. All the obtained perovskites have tetragonal symmetry distorted by Jahn-Teller effect of $Cu^{2+}$. In the case of $Sr(Cu_{1}3}Nb_{2}3})O_3$, some superlattice lines caused by threefold enlarging of fundamental unit cell were observed. And, the symmetry of B site octahedron and the bonding character of B-O bond have been studied by IR, ESR and diffuse reflection spectroscopy. It appeared that the symmetry and the bonding character are influenced by such factors as the size and the basicity of A cation.
( Min Bum Lee ),( Jun-ho Lee ),( Seong Hwi Hong ),( Jueng Soo You ),( Seung Taek Nam ),( Hyun Woo Kim ),( Young Hwan Park ),( Dajeong Lee ),( Keun Young Min ),( Yeong-min Park ),( Young Mi Kim ),( Hyu 생화학분자생물학회(구 한국생화학분자생물학회) 2017 BMB Reports Vol.50 No.12
Regulatory B cells, also well-known as IL-10-producing B cells, play a role in the suppression of inflammatory responses. However, the epigenetic modulation of regulatory B cells is largely unknown. Recent studies showed that the bromodo-main and extra-terminal domain (BET) protein inhibitor JQ1 controls the expression of various genes involving cell pro-liferation and cell cycle. However, the role of BET proteins on development of regulatory B cells is not reported. In this study, JQ1 potently suppressed IL-10 expression and secretion in murine splenic and peritoneal B cells. While bromodomain-containing protein 4 (BRD4) was associated with NF-κB on IL-10 promoter region by LPS stimulation, JQ1 interfered the interaction of BRD4 with NF-κB on IL-10 promoter. In summary, BRD4 is essential for toll like receptor 4 (TLR4)-mediated IL-10 expression, suggesting JQ1 could be a potential candidate in regulating IL-10-producing regulatory B cells in cancer. [BMB Reports 2017; 50(12): 640-646]
$BaTiO_3$의 강유전-상유전 상전이에 미치는 A($Cu_{1/3}Nb_{2/3}$)$O_3$ (A=Pb, Ba 및 Sr)의 영향
박휴범,김정,김시중,Park, Hyu-Bum,Kim, Jung,Kim, Si-Joong 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.12
The influences of A(Cu1/3Nb2/3)O3(A=Pb, Ba and Sr) on the ferroelectric-paraelectric phase transition of BaTiO3 ceramics has been investigated. The tetragonality of crystal structure decreased with increasing A(Cu1/3Nb2/3)O3 content at room temperature. A linear correlation between Curie point and the tetragonality of lattice was not observed. In all three systems the variation of Curie point with the mole fraction showed similar tendency that the Curie point decreased at lower mole fraction but gradually increased in the region of higher mole fractions, Diffuse phase transitions were observed at higher mole fractions. The variation of Curie points could be explained by internal stress and Jahn-Teller distortion of BO6 due to Cu2+, and it was thought that the diffuse character of phase transition was caused by compositional fluctuation.
외상환자의 초기 사망 예측 지표로서의 내원 초기의 염기 결핍, 젖산 및 강이온 차이의 유용성 비교
박경혜 ( Kyung Hye Park ),이강현 ( Kang Hyun Lee ),김선휴 ( Seon Hyu Kim ),오성범 ( Sung Bum Oh ),문중범 ( Joong Bum Moon ),김현 ( Hyun Kim ),황성오 ( Sung Oh Hwang ),김헌주 ( Heon Ju Kim ) 대한외상학회 2005 大韓外傷學會誌 Vol.18 No.2
Purpose: Currently, there is a variety of systems available for predicting prognosis of trauma patients such as trauma score, Injury severity score (ISS) and acid-base variables. But it is not clear that the initial acid-base variables are predictors of prognosis in trauma patients at the emergency department. The objective of this study is to compare the base deficit, lactate and strong ion gap as an early predictor of mortality in trauma patients. Methods: Retrospective record review of 136 trauma patients needed to admit to intensive care unit via emergency department (June 2004 to February 2005). Data included age, injury mechanism, ISS, Revised trauma score (RTS), Multiple organ dysfunction score (MODS), Acute physiology and chronic health evaluation III (APACHE III), Glasgow coma scale (GCS), laboratory profiles, calculated anion gap and strong ion gap. Patients were divided into survivors and non-survivors, shock group and non-shock group with comparison by t-test; significance was assumed for p<0.05. Correlation between acid-base variables and mean arterial blood pressure (MABP) was evaluated. Results: There was a significant difference between the RTS (p=0.00), APACHE III (p=0.00), MODS (p=0.00), GCS (p=0.00) of survivors and non-survivors. There was no significant difference between the ISS (p=0.082), lactate (p=0.541), base excess (p=0.468) and SIG (p=0.894) of survivors and non-survivors. There was a significant difference between the RTS (p=0.023), APACHE III (p=0.002), lactate (p=0.000), base excess (p=0.000) and SIG (p=0.000) of shock and non-shock group. There was no significant difference between the ISS (p=0.270), MODS (p=0.442) and GCS (p=0.432) of shock and non-shock group. The base excess was most correlated to MABP (r2=0.150). Conclusion: Initial base deficit, serum lactate and SIG are not predictors of mortality in moderate to severe trauma patients. Initial base deficit, serum lactate and SIG are correlated with the mean arterial blood pressure in trauma patients in emergency department.
Effects of A-Site and B-Site Vacancies on Structural and Dielectric Properties of PLZT Ceramics
Jeong, Cheol-Su,Park, Hyu-Bum,Hong, Young-Sik,Kim, Si-Joong The Korean Ceramic Society 1996 The Korean journal of ceramics Vol.2 No.2
PLZT ceramics having two nominal compositions, $Pb_{1-3x/2}La_xV_{x/2}(Zr_{03}Ti_{03})O_3$ and $Pb_{1-x}La_x(Zr_{0.2}Ti_{0.5})_{1-x/4}V_{x/4}O_3$ (V: vacancy) with x=0.00~0.30, were prepared. The physical, structural, and dielectric properties were investigated by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and measurements of bulk density and dielectric constant. The two series with A-stie and B-site vacancies showed different physical, structural, dielectric properties, and, specially, Curie temperature. In comparison to PLZT with B-site vacancies, PLZT with A-site vacancies showed high Curie temperatures and low maxima of dielectric constant. Consequently, it is evident that the properties of PLZT ceramics depend on the vacancy formula adopted as a batch composition in preparation.
$Na^+/La^{3+}$이온으로 치환된$Pb(Mg_{1}{3}Nb_{2}{3})O_3$의 구조 변화 및 유전 성질
홍영식,박휴범,안태호,김시중,Hong, Young-Sik,Park, Hyu-Bum,Ahn, Tae-Ho,Kim, Si-Joong 대한화학회 1996 대한화학회지 Vol.40 No.9
$ABO_3$계 perovskite 구조에서 A자리의 $Pb^{2+}$ 이온이 $Na^+La^{3+}$혼합 이온 으로 0-50mol.%치환된 $Pb_{1-x}(Na_12/La_12)_x(Mg_13/Nb_23/)O_3$ 화합물의 구조변화와 유전 성질을 X-선 회절법, 작외선과 라만 분광법, LCR meter등으로 연구하였다. $Na^+La^{3+}$혼합 이온의 치환량과 소결 온도가 증가함에 따라 perovskite 상의 양이 증가하였다. 치환량이 증가할 때 1:1 질서화에 의한 초격자선을 X-선 회절법으로 발견할수 없었지만, 라만 분광법과 이완성 매개변수의 증가로부터 A자리 양이온의 크기감소가 질서화에 영향을 미침을 알 수 있었다. Pb_{1-x}(Na_12/La_12)_x(Mg_13/Nb_23/)O_3$의 유전 성질은 perovskite 상의 양과 낟알 크기 및 밀도에 의해 영향을 받았고, 치환량이 증가할 때 상전이는 확산되었으며 상전이 온도는 감소하였다. The structural changes and dielectric properties of Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 compounds substituted by 0∼50 mol.% of Na+/La3+ mixed ions were investigated by X-ray diffraction method, IR and Raman spectroscopy, and LCR meter. The amount of perovskite phase increased with the increases of Na+/La3+ substituents and sintering temperatures. Although the superlattice lines due to 1:1 ordering were not detected by X-ray diffraction method, it was found, from the Raman spectroscopy and the increase of diffuseness coefficient, that the ordering behavior was related to the decrease of A site ion size. Dielectric properties in Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 were affected by the amount of perovskite phase, grain size, and density. The phase transitions were broadened and phase transition temperatures were lowered by the increase of Na+/La3+ ions.
거대고리 리간드와 금속이온과의 착물에 관한 반응속도론적 연구
조문환,김진호,박휴범,김시중,Moon-Hwan Cho,Jin-Ho Kim,Hyu-Bum Park,Si-Joon Kim 대한화학회 1989 대한화학회지 Vol.33 No.4
새로운 거대고리 리간드 1,15,18-triaza-3,4 : 12,13-dibenzo-5,8,11-trioxa-cycloeicosane(NdienOdien$H_4$=$N_3O_3$)를 합성하여 $25^{\circ}C$ 95% 메탄올 용액에서 전위차계를 이용하여 양성자 첨가반응의 평형상수를 구한 결과 log $K_1$ ; log $K_2$ ; log $K_3$는 9.1; 8.1; 3.6이었다. 또한 위의 리간드와 이미 합성된 리간드 1,12,15-triaza-3,4;9,10-dibenzo-5,8-dioxa-cycloheptadecane(NdienOen$H_4$=$N_3O_2$)를 각각 Ni(II), Cu(II)의 금속이온과의 착물을 합성하여 수용액에서 산을 가해 착물의 산해리반응 속도 상수를 여러온도에서 분광광도법으로 측정하였다. 또한 활성화에너지($E_a$)와 활성화파라메타 ${\Delta}H^{\neq}$, ${\Delta}S^{\neq}$를 구하였다. 그리고 이들의 자료로부터 이 반응계의 타당한 해리메카니즘을 제안하였다. A new macrocyclic ligand 1,15,18-triaza-3,4;12,13-dibenzo-5,8,11-cycloeicosane (NdienOdien$H_4$ = $N_3O_3$) has been synthesized and identified by element analysis, NMR and IR spectrophotometry. Stepwise protonation constants of ligand are determined by potentiometry in 95% methanol solution(I = 0.1 mol $dm^{-3}$, $Me_4$NCl). log $K_1$;log $K_2$;log $K_3$ = 9.1;8.1;3.6.The kinetics of the acid-promoted dissociation reactions of complex cations of nickel(II) and copper(III) with NdienOdien and NdienOen macrocyclic ligands having, respectively, 17 and 20 ring members, have been studied spectrophotometrically in HCl$O_4$ NaCl$O_4$ aqueous solutions. From the temperature effect on kinetic constant ($k_{obs}$), the parameters of activation(${\Delta}H^{\neq}$, ${\Delta}S^{\neq}$) of dissociation reaction for $ML^{2+}$ with $H^+$ ion have been determined. We have proposed the possible mechanism of the reaction from the data obtained.