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옥용식,최유석,이상은,임수길,정남현,김정규,Ok, Yong-Sik,Choi, You-Suk,Lee, Sang-Eun,Lim, Soo-Kil,Chung, Nam-Hyun,Kim, Jeong-Gyu 한국토양비료학회 2001 한국토양비료학회지 Vol.34 No.4
토양의 하전특성을 평가하는 데 이용되는 이온흡착법에서 지표이온이 달라졌을 때 측정되는 표면전하량의 차이를 파악하기 위하여, 화강암을 모재로 하는 논토양(지산통, 사촌통)과 밭토양(상주통, 백산통)에 $Na^+$와 $K^+$ 이온을 지표이온으로 하는 이온흡착법을 적용하였다. 표면 음전하는 모든 pH에서 직선적으로 증가하는 경향을 보였고, 표면 양전하는 pH6 이하에서만 미량으로 발현되고 중성 이상에서는 거의 발현되지 않았다. 또, NaCl이 지표이온종인 경우 KCl을 사용하여 측정한 표면전하량에 비해 측정된 모든 pH 범위에서 상대적으로 낮은 전하밀도값을 나타내었다. 이러한 차이는 지표이온종의 수화반경에 따른 표면 흡착강도 차에 기인하는 것으로 판단된다. 지산, 사촌, 백산통의 표면전하량은 pH에 따라 $0.21{\sim}9.01cmol_c{\cdot}kg^{-1}$의 범위 내에 존재하였으며, 통일한 pH에서는 백산통의 표면전하 밀도가 다른 토양에 비하여 가장 높게 나타났다. 본 연구에서 분석된 토양의 pH 변화에 따른 전하변화량(dCEC/dpH)은 가변전하를 발현시키는 토양구성물 중 유기물에 의하여 가장 크게 변화하는 것으로 나타났다. Investigation on the surface charge properties of some Korean arable soils was performed by ion adsorption technique with two kinds of indifferent ion ($Na^+$ and $K^+$) at the range of pH 3 to 9 in bulk solution. The contribution of soil components(organic matter, oxides and clay mineral) on the surface charge density was determined at two soil depth with different solid particle composition When the pH of solution increased, the negative charge of soil surface was increased among the all soils, but positive charge were not appeared above pH 6. apparently. The magnitude of surface charge density measured by NaCl adsorption method showed ra nges of $0.01{\sim}2.84cmol_c{\cdot}kg^{-1}$ and $7.41{\sim}12.20cmol_c{\cdot}kg^{-1}$ at pH 3 and pH 9, respectively. Ion adsorption method using KCl as index ion overestimated than the method using NaCl as index ion. The content of organic matter is the strongest factor on the value of dCEC/dpH.
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권민,최병선,박언섭,정남현,박성조,임영,박정덕,Kwon, Min,Choi, Byung-Sun,Park, Eon-Sub,Chung, Nam-Hyun,Park, Sung-Jo,Lim, Young,Park, Jung-Duck 대한예방의학회 2004 예방의학회지 Vol.37 No.4
Objectives : Iron (Fe) is an essential element in biological processes; however excessive Fe is harmful to human health. Some air pollutants contain a high level of Fe, and the human lung could therefore be over-exposed to Fe through inhaled air pollutants. This study was performed to investigate the role of metal transporters (divalent metal transporter 1, DMT1, and metal transporter protein 1, MTP1) in the lung under the environments of Fe deficiency in the body and Fe over-exposure in the lung. Methods : Rats were fed Fe deficient (FeD, 2-6 mg Fe/kg) or Fe supplemented (FeS, 120 mg Fe/kg) diet for 4 weeks, followed by a single intratracheal instillation of ferrous sulfate at low (10 mg/kg) or high (20 mg/kg) dose. Fe concentration was analyzed in the serum, lung and liver, and histopathological findings were observed in the lung at 24 hours after Fe administration. The level of DMT1 and MTP1 expression in the lung was analyzed by RT-PCR. Also, the effect of Fe deficiency in the body was evaluated on the level of Fe concentration and metal transporters compared to FeS-diet fed rats at the end of 4-week FeD or FeS diet. Results : The 4-week FeD diet in rats induced an Fe deficiency anemia with decreased serum total Fe, increased unsaturated Fe binding capacity and hypochromic microcytic red blood cells. The concentration of Fe in the lung and liver was lower in the FeD-diet fed rats than in the FeS-diet fed rats. The level of metal transporters mRNA expression was higher in the FeD-diet fed rats than in the FeS-diet. The concentration of Fe in the lung was increased in a dose-dependent pattern after intratracheal instillation of Fe into the rats, while the level of Fe in the serum and liver was not increased in the low-dose Fe administered rats. Therefore, DMT1 and MTP1 mRNA was highly expressed in both FeD-diet and FeS-diet fed rats, after intratracheal instillation of Fe. Conclusions : DMT1 and MTP1 mRNA were more highly expressed in FeD-diet fed rats than in FeS-diet fed rats. The over-exposure of Fe intratracheally induced high expression of metal transporters and increased Fe deposition in the lung in both FeD-diet and FeS-diet fed rats, but did not increase the Fe level of the serum and liver in low-dose Fe administered rats. These results suggest that the role of metal transporters in the lung might be different in a part from the duodenum under the environment of over-exposure to Fe.
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실험적 항기저막 사구체신염에 재조합 Uteroglobin 투여가 미치는 영향
김연수(Yon Su Kim),김현리(Hyun Lee Kim),이상구(Sang Goo Lee),양승희(Seung Hee Yang),김유영(You Young Kim),이세한(Sei Han Lee),정남현(Nam Hyun Chung),정현주(Hyun Joo Chung),김성균(Sung Kyun Kim) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.4
목 적 : 면역복합체 침착으로 인한 사구체신염은 우리나라 말기신부전의 중요한 원인이다. 최근 면역조절기능을 가진 uteroglobin(UG)을 유전적으로 결핍시킨 동물모델에서 인체의 IgA 신염과 같은 사구체신염의 발생이 보고된 바 있다. 저자들은 생쥐에서 항기저막 사구체신염(aGBMGN)을 발생시키고 인체 재조합 UG를 이용하여 신염의 발생에 UG가 미치는 영향을 확인하고 신염 억제기전을 파악하고자 하였다. 방 법 : 토끼에서 생산한 Anti-GBM Ab 4.5 ㎎을 8주령의 생쥐(C57BL/6)에 정맥주사하여 aGBM-GN을 유발시킨 후, UG를 투여한 치료군, 질환대조군, 정상대조군에서 신염의 정도를 비교하였다. 또한 생쥐의 메산지움세포를 LPS로 자극한 후 UG에 의한 세포증식의 저해정도를 비교하였다. 결 과: 신염 유도 후 7일째 치료군은 정상대조군에 비해 요단백량/creatinine 값은 차이를 나타내지 않았지만, 질환대조군에 비해서는 유의한 감소를 나타내었다. 이러한 UG의 효과는 사구 체신염이 유도된 14일째까지 유지되었으며, 21일째에는 치료군과 질환대조군에서의 요단백/creatinine 값이 정상대조군에 비해 감소하였다. 조직학적으로 신염이 유도된 7일째, 질환대조군에서는 메산지움세포의 증식과 사구체의 50% 이상에서 세포성 반월상이 관찰되었으나, 치료군은 정상대조군과 유사한 조직학적 소견을 보였다. 생쥐 메산지움세포를 LPS로 자극한 후 UG를 투여 하였을 경우 LPS에 의한 세포 증식효과는 유의한 감소를 보였다. 결 론: 실험적으로 유도된 항기저막 사구체신염에 인체 재조합 UG를 투여함으로써 항기저막 사구체신염의 발생을 억제하였으며, 그 기전으로 메산지움세포 활성화 억제 가능성을 제시하였다. 이러한 결과는 신질환 진행 고위험군 집단의 유전자치료에도 이용될 수 있는 근거를 제시하였다고 할 수 있다. Glomerulonephritis(GN) is characterized by cognate immune responses against self or non-self antigen. It is suggested that the crescentic GN is a manifestation of cell-mediated immune response akin to delayed type hypersensitivity. Uteroglobin(UG) is a steroid-dependent, immunomodulatory, and cytokine-like protein. It was reported that UG prevented fibronectin(Fn) deposition in the glomeruli of normal mice to form Fn-UG heterodimers that competed with Fn self-aggregation. We hypothesized that UG would prevent the development of experimental GN induced by anti-glomerular basement membrane globulin(anti-GBM Ab) in mice through immunomodulatory properties. GN was induced by intravenous injection of 4.5㎎ rabbit anti-GBM Ab to mice(C57BL/6). Renal injury was evaluated at 7, 14, and 21 days thereafter. UG-treated mice(n=10) were received for 3 days(0.5 ㎎/mouse/day) beginning 1 hour after anti-GBM Ab injection. Also, disease-control mice(n=10) were received PBS for 3 days after anti-GBM Ab. Proteinuria was significantly reduced in the mice treated with UG when compared with the disease-control mice after 7 and 14 days of anti-GBM Ab injection. The amount of proteinuria was similar between UG treated and normal control mice. The mesangial matrix expansion and cellular crescent were markedly attenuated by the injection of UG. The proliferative responses of mesangial cells(C57BL/6) to LPS were blunted with the addition of UG in dose-dependent manner. In this study, we revealed the preventive effects of UG in the experimental model of glomerulonephritis. This result in turn could provide the basis for the treatment of human disease such as chronic glomerulonephritis.
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천연물 / 유기화학 : 혐기와 호기 상태의 물과 토양에서 pH, PO4-P, 탁도, T-P 농도 관계
민영홍 ( Young Hong Min ),강삼우 ( Sam Woo Kang ),이회선 ( Hoi Seon Lee ),정남현 ( Nam Hyun Chung ) 한국응용생명화학회 2011 Journal of Applied Biological Chemistry (J. Appl. Vol.54 No.3
This research was carried out to elucidate the impacts of dissolved oxygen (DO) concentration to phosphorus release mechanism from soil into water in lakes. PO4-P contributed to the growth of the total phosphorus (T-P). PO4-P was steadily increasing because water was accumulating PO4-P. T-P was closely related to turbidity, pH, and DO. We found that DO had decreased because DO was consumed in organic matter decomposition, and that the resulting anaerobic decomposition occurred whenever water had run out of DO. We also found that pH had decreased sharply by production of organic acid by the anaerobic decomposition and that T-P decreased because a decrease in pH removed turbidity by precipitation. T-P was dissolved without microbial decomposition. This mechanism was of great importance in lakes because phosphorus is released from soil into water.
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