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Elimination of Lead by TTFD and TPD from Central Nervous System of Postnatally Lead - exposed Rats
Cheong, Jae Hoon,Ahn, Jae Suk,Seo, Dong Ook,Kim, Kyeong Man,Ko, Kwang Ho 한국환경독성학회 1992 환경독성보건학회지 Vol.7 No.1
Amount of lead burden in a tissue reflects poisoning of lead in that tissue, so is the removal of lead directly connected to curement of lead poisoning. The purpose of present study was to investigate the relative effects of penicillamine and thiamine tetrahydrofurfuryl disulfide (TTFD) or thiamine propyl disulfide (TPD) in the removal of lead from rat brain tissue treated with excessive lead. Wistar rat pups of both sexes were used in this experiment. Within 1 day of parturition, experimental mothers nursing their pups as well as rat pups were given drinking water containing 0.2% lead acetate, TTFD 20 mg/1.2 L (2 mg/kg/day), TPD 20 mg/1.2 L (2 mg/kg/day), penicillamine 40 mg/1.2 L (40 mg/kg/day), 0.2% lead acetate+TTFD 20 mg/1.2 L (2 mg/kg/day), 0.2% lead acetate+TPD 20 mg/1.2 L (2 mg/kg/day) or 0.2% lead acetate+penicillamine 40 mg/1.2 L (40 mg/kg/day) ad libitum, throughout the entire period of experiment. Rat pups in the control group received normal tap water. The animals were sacrificed by decapitation on the day when they become 2 or 8 weeks of age. Brains were dissected into five regions: telencephalon, diencephalon, midbrain, pons/medulla and cerebellum. The dissected brain tissues were lyophillized and then solubilized by acid mixture (nitric acid+sulfuric acid). Lead levels in the solubilized brain tissues were measured by the inductively coupled plasma. In lead-exposed rats, lead levels were significantly higher than those of control group in all brain regions, lead levels in brain regions of TTFD or TPD group were generally lower than those of control group. The simultaneous administration of lead with TTFD or TPD to animals caused significant decrement of lead from all brain regions. In the elimination of lead from brain regions, effectiveness of TTFD or TPD was equivalant to penicillamine.
PVA 섬유 혼입률에 따른 PC 패널용 모르타르의 기초 물성에 관한 실험적 연구
이재현(Lee Jae-Hyun),송영찬(Song Young-Chan),김용로(Kim Yong-Ro),김욱종(Kim Ook-Jong),이도범(Lee Do-Bum),고창현(Ko Chang-Hyun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Nowadays, the high performance composite materials are famous for the new construction materials of the construction buildings are bigger and higher. Out of them of all, the fiber reinforced concrete and mortar have been studied to develop and strengthen the performances of concrete, such as tensile strength, durability and the resistibility of crack. Also, it is considered that precast concrete is important alternatives of dry process for saving time, upgrading the material's quality and the productivity. Thus, PC panel is being produced for the use of dry wall as wells as exterior finishing materials and it requires lots of tests and studies to be conducted to meet the various functional conditions. Accordingly, this study was performed to study for basic properties of mortar by adding ratios of PVA fiber and this one will offer the basic data for developing the upcoming exterior PC panels.
Hee-Joo Jeon,Jae-Jung Ko,Kang-bong Lee,Sang Ook Kang Korean Chemical Society 1993 Bulletin of the Korean Chemical Society Vol.14 No.1
Good yield synthetic routes for the production of new B-alkyl-dithiaborane clusters are reported. The syntheses of the B-alkyl-dithiaboranes are based on the use of Fischer-type carbene reagents to activate the B-H bonds of dithiaborane for alkyl-addition reactions and are the first examples of transition-mediated reactions of dithiaborane to be reported. Thus, reactions employing arachno-$S_2B_7H_8$- and $(CO)_5M{C(R_1)R_2}$ (M = Cr, W; $R_1 = CH_3,\;C_6H_5;\; R_2 = OCH_3,\;SC_6H_5)$ were found to yield the intermidiate anions I, $[(CO)_5M{C(R_1)R_2S_2B_7H_8}]^-$, which upon protonation gave the corresponding neutral, air-sensitive cluster arachno-4-$RCH_2-6,8-S_2B_7H_8(R=CH_3,\;IIa;\;C_6H_5,\;IIb)$ range from 30 to 35% yield. Complexes IIa and IIb are isoelectronic with arachno-6,8-$S_2B_7H_9$ and, on the basis of the spectroscopic data, are proposed to adopt a similar arachno cage geometry in which an $RCH_2$ units are substituted to 4 position boron atom of the arachno-6,8-$S_2B_7H_9$.
Song, Kyu-Ho,Ko, Jae-Jung,Kang, Sang-Ook,Han, Won-Sik,Kwon, Soon-Nam,Suh, Il-Hwan Korean Crystallographic Association 2008 韓國結晶學會誌 Vol.19 No.1
Dilithio-o-carborane과 dipenyl disulfide를 반응(反應)하여 a phenyl thiolated o-carborane compound가 얻어 졌으며 X-ray crystallography로 밝혀진 이 compound의 구조(構造)와 ab initio 및 density functional theory로 계산(計算)한 이 compound의 구조문(構造間)에 conformational similarity가 있음을 확인(確認)하였다. The reaction of dilithio-o-carborane with dipenyl disulfide produces a phenyl thiolated o-carborane and it has been confirmed that there is conformational similarity between the structure of the compound elucidated by X-ray crystallography and that calculated by ab initio and density functional theory.
Hexaphenylbenzene $C_6(C_6H_5)_6$
Kim Young-Sang,Ko Jaejung,Kang Sang Ook,Han Won-Sik,Jeong Jae-Ho,Suh Il-Hwan Korean Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.1
The structure of the title compound has been determined by single-crystal X-ray diffraction work. The crystals are orthorhombic, space group $Pna2_1$ with a=11.095(3), b=21.834(7), c=12.574(4) $\AA$, and R1=0.0667. The average carbon bond length in aromaticity In the molecule is 1.386(1) $\AA$ and the average single bond length linking the central benEene ring and peripheral phenyl rings is 1.491(3) $\AA$. The average dihedral angle between the central benzene ring and each of six peripheral phenyl rings is $67.1(1)^{\circ}$ and the average dihedral angle between neighboring two phenyl rings is $55.0(1)^{\circ}$. Thus the molecule adopts a quasi-propeller configuration with approximate six-fold rotation symmetry.