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김공수,김민호,김창곤,김석기,조경우,최훈,Kim, Kong-Soo,Kim, Min-Ho,Kim, Chang-Gon,Kim, Suk-Kee,Cho, Kyung-Woo,Cui, Xun 대한흉부심장혈관외과학회 2000 Journal of Chest Surgery (J Chest Surg) Vol.33 No.5
Background: Cardiac atrium is an endocrine gland secreting a family of natriuretic peptides. The secretion of atrial natriuretic peptide(ANP) had been shown to be controlled by variable factors. The change in atrial dynamics have been considered as one of the most prominent stimuli for the stimulation of ANP secretion. Hypoxic stress has been shown to increase cardiac ANP secretion. However, the mechanism by which hypoxia increases ANP secretion cardiac ANP secretions. However, the mechanism by which hypoxia increases ANP secretion has not to be defined. Therefore, the purpose of the present study was tow-fold: to develop a protocol to defined the effect of hypoxia on ANP secretion in perfused beating rabbit atria and to clarify the mechanism responsible for the accentuation by hypoxia of ANP secretion. Material and Method: Experiments have been done in perfused beating rabbit atria. ANP was measured by radioimmunoassay. Result: Hypoxic stimulus with nitrogen decreased atrial stroke volume. The decrease in atrial stroke volume recovered basal level during the period of recovery with oxygen. ANP secretion and the concentration of perfusate ANP in terms of extracellular fluid(ECF) translocation which reflects the rate of myocytic release of ANP were increased by hypoxia and returned to basal levels during the recovery. Changes in ECF translocation paralleled by hypoxia and returned to basal levels during the recovery. Changes in ECF translocation paralleled to that of atrial stroke volume. At the start of recovery in atrial storke volume, ECF tranalocation incrased for several minutes. The above responses were stable and reproducible. Glibenclamide treatment prevented the recovery in atrial stroke volume. Increments by hypoxia of ANP secretion and ANP concentration were suppressed by glibenclamide. Conclusion: These results indicate that hypoxia incrased atrial myocytic ANP release and that the mechanism responsible for the accentuation is partially related to the change in K+ATP channel activity.
Sorbitol 이 결합된 아크릴계 고흡수성 수지의 합성 및 특성
김공수,신재섭,문용운,이광용 ( Kong Soo Kim,Jae Sup Shin,Yong Un Moon,Kwang Yong Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.1
역상현탁 중합방법으로 sodium acrylate 및 아크릴산을 모노머로 사용하고 분산제로는 sucrose fatty acid ester(S-570), 중점제로는 Xanthan-gum, 가교제로는 EDGMA 및 GPGE, 개시제로는 K₂S₂O_8, 및 용매로는 사이클로헥산을 사용하여, sorbitol의 함유량을 10∼50%로 변화시키면서 sorbitol이 결합하고 있는 고흡수성 수지(SAP)를 합성하였다. 합성한 고흡수성 수지를 모노머량의 0.05∼0.40㏖%로 표면가교 시켰고, 입자형태는 구형이었으며 입자크기 분포는 177∼707㎛ 이었다. 고흡수성 수지의 흡수량은 물에 대하여는 785∼1086배 이었고, 0.9% NaCl 용액에 대해서는 50∼83배이었다. Sorbitol의 함유량이 증가할수록 고흡수성 수지의 흡수량과 보수량은 감소하였으며, +5 ㎈/g SAP의 흡열특성을 나타내었다. Polyacrylic super absorbent polymer(SAP) containing sorbitol was synthesized by inverse-suspension polymerization method. Sodium acrylate and acrylic acid were used as a monomer, ethylene glycol dimethacrylate(EGDMA) and glycerol polyglycidyl ether(GPGE) were used as a crosslinking agent, potassium persulfate(PPS) was used as an initiator, and cyclohexane was used as a solvent. Content of sorbitol was from 10㏖% to 50㏖% according to the mol ratio of acrylic acid monomer. The size distribution of the round shaped polymeric particle was 177∼707㎛. Absorption amount of the polymer containing sorbitol was 785 to 1086 times of the polymer weight in distilled water, was 50 to 83 times in 0.9% NaCl solution. Absorption and retention amount of the polymer were decreased with increasing the amount of sorbitol, but the polymer has an endothermic property which is +5 ㎈/g SAP.
김공수,이영우,이두희,Kong Soo Kim,Yong Woo Lee,Doo Hee Lee 대한화학회 1985 대한화학회지 Vol.29 No.5
$p^-$, $m^-$, o-phthalaldehyde 및 5,5'-methylene-bis-salicyl aldehyde (PPTA, MPTA, OPTA, MBSA)와 5,5'-methylene-bis-salicylic dihydrazide, terephthalic dihydrazide 및 sebacic dihydrazide(MBSDH, TDH 및 SDH)등의 디히드라지드 화합물을 DMF-$CH_3COOH$ 혼합용액 중에서 축합반응으로 몇가지 새로운 폴리히드라존을 합성하였다. 합성한 폴리히드라존과 그의 금속킬레이트의 용해성, 흡수스펙트라 및 열적성질에 대하여 검토하였다. OPTA와 MBSDH의 반응으로 얻어진 폴리히드라존을 제외한 폴리히드라존과 그의 금속킬레이트는 일반적으로 보통 유기용매에 불응성이었다. 폴리히드라존의 중량열분석 결과 250-350$^{\circ}$C 사이에서 10%의 중량감소가 일어났고 500$^{\circ}$C고 500 폴리히드라존의 중량열분석 결과 250~350$^{\circ}$C 사이에서 10%의 중량감소가 일어났고 500$^{\circ}$C에서 32.5~63.5% 범위의 잔유중량을 나타내었다. 합성한 폴리히드라존 중에서 PPTA-MBSDH(IIa)및 MBSA-MBSDH(IIIa)가 열분해온도가 비교적 높았으며 IIa의 금속킬레이트에 있어서는 Zn(II)-IIa>Ni(II)-IIa>Co(II)-IIa>Cu(II)-IIa의 순서로 열분해온도가 저하되었다. A new class of polyhydrazones has been synthesized by the solution polycondensation from equimolecular amounts of aromatic dialdehydes such as para, meta, ortho-phthal aldehyde, 5,5'-methylene-bis-salicyl aldehyde (PPTA, MPTA, OPTA, MBSA) and dihydrazides, 5,5'-methylene-bis-salicylic dihydrazide (MBSDH), terephthalic dihydrazide (TDH), sebacic dihydrazide (SDH) in DMF-$CH_3COOH$ solution. The solubility characteristics, spectral, and thermal properties of the synthesized polyhydrazones and their metal chelates were also studied. These polyhydrazones and their metal chelates except the polyhydrazone prepared from OPTA-MBSDH were generally insoluble in common organic solvents. The thermogravimetric analysis of polyhydrazones showed 10% weight losses at 250∼350$^{\circ}$C and residual weight at 500$^{\circ}$C were 32.5∼62.5%. The decomposition temperature of higher relatively, and the metal chelates decrease in the following orders; Zn(II)-IIa > Ni(II)-IIa > Co(II)-IIa > Cu(II)-IIa.
김공수,강석호,박명환,이상호 ( Kong Soo Kim,Seog Ho Kang,Myung Hwan Park,Sang Ho Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.6
분산중합으로 합성한 폴리스티렌 seed를 사용하여 seed 중합방법으로 단분산성인 다공성 스티렌-디비닐벤젠(St-DVB) 겔과 아크릴로니트릴-에틸렌 디메타크릴레이트(AN-EDMA) 겔을 제조하였다. 합성한 St-DVB 겔과 AN-EDMA 겔은 HPLC용 충진제로 적합한 좁은 입도분포와 다공성을 갖고 있으며, 이들 겔을 충진한 GPC 또는 HPLC용 column은 비교적 높은 효율을 나타내었다, 또한 AN-EDMA 겔을 아미드옥심화한 AAN-EDMA 겔에 대한 Cu^(2+) Cd^(2+) 및 UO₂^(2+) 이온의 흡착특성을 시험하였다. Monodisperse porous poly(styrene-co-divinylbenzene)(St-DVB) gel and poly(acrylonitrile-co-ethylene dimethacrylate)(AN-EDMA) gel have been prepared by seed polymerization using polystyrene seeds, which were prepared by dispersion polymerization. The St-DVB and AN-EDMA gels had a narrow size distribution and pores suitable for packing materials of HPLC. The columns packed with these gels were proved to have high efficiency for GPC or HPLC columns. Adsorption properties of Cu^(2+), Cd^(2+) and UO₂^(2+) ions on AAN-EDMA gel prepared from amidoximation of AN-EDMA gel were also determined.
Poly(AAm-co-HEMA) / CMC 복합막의 제조 및 팽윤특성
김공수,문용운,맹학영 ( K . S . Kim,Y . W . Moon,H . Y . Maeng ) 충북대학교 산업과학기술연구소 1994 산업과학기술연구 논문집 Vol.8 No.2
Abstract_Roman Poly(Aam-co-HEMA) was prepared by so1ution polymerization method of Aam with HEMA. The composite membranes af CMC with Poly(Aam-co-HEMA) were prepared of different of blend ratio and their swelling degree was tested in pH 4 and pH 7 aqueuo
CA 막에 4-비닐피리딘의 그라프트 공중합 및 그의 페놀 투과특성
김공수,이민석,박준하,김영식 ( Kong Soo Kim,Min Suk Lee,Jun Ha Park,Young Sik Kim ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman Graft copolymerization of 4-vinylpyridine onto CA membrane was carried out in an aqueous medium by using ceric ammonium nitrate(CAN) as an initiator. The optmium condition for the graft copolymerization were 60'C; pretreatment and grafting
김공수,김영식 ( Kong Soo Kim,Young Sik Kim ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman The flow properties of two spherical particle filled suspension system were investigated; (1)calcium carbonate filled hydroxyethyl cellulose(HEC) aqueous solution which behaves like a pseudoplastic fluid, (2)glass bead filled polyvinyl alc