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Byeong-Deok Hong,Kyo-seok Lee,Dong-Sung Lee,Ja-Hyun Rhie,Hui-Su Bae,IL-Hwan Seo,Seung-Geun Song,Doug-Young Chung 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.5
In this experiment we investigated the influence of various anions including oxalic acid encountered as solution phase in soil on the adsorption and desorption of sulfate in Chungwon Bt soil. The effect of chloride and nitrate on the adsorption of sulfate was not significant, suggesting that sulfate was better able to compete for adsorption sites at concentrations studied, in contrast to the large reduction in the amount of chloride adsorbed in the presence of sulfate. The results of competition for sorption sites between sulfate and anion showed that the simultaneous presence of two anions in solution was effective in reduction of competing anion at a maximum value of adsorption, due to the similar adsorption mechanism for anion competition. Therefore, the variation in the buffer power of the acids will produce a change in the strength and amount of adsorption and the competitive ability.
Seung-Geun Song,Kyo-seok Lee,Dong-Sung Lee,Ja-Hyun Rhie,Byeong-Deok Hong,Hui-Su Bae,Il-Hwan Seo,Doug-Young Chung 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.5
To identify causes for drastic decrease in yield of tomato with repeated culturing number of the bag culture substrate of greenhouse tomatoes we investigated the physical and chemical properties of a coir used as the bag culture substrate to grow tomato at the Booyeo tomato experimental institute located in Booyeo, Chungnam Province for three years from 2012 to 2014. The results showed that total porosity ranged from 65.4 to 73.1% for the bulk densities of coir ranging from 0.12 to 0.14 g cm<SUP>-3</SUP>. The volumetric water contents measured at 0.01 bar as air entry point were 25% (before), 33% (1<SUP>st</SUP> yr), 45% (2<SUP>nd</SUP> yr), and 37% (3<SUP>rd</SUP> yr). Organic matter contents ranged from 82.0 to 96.2% (highest in 1<SUP>st</SUP> yr). pH and EC ranged from 4.47 to 6.47 (highest in 2<SUP>nd</SUP> yr), and from 22.2 to 53.5 dS m<SUP>-1</SUP> (highest in 1<SUP>st</SUP> yr) and cation exchange capacity ranged from 71.0 to 191.7 cmol kg<SUP>-1</SUP>(highest in 3<SUP>rd</SUP> yr). The surface structure observed with electrical microscope showed that the number of large pores decreased with increasing cultivating time while the proportion of smaller pores increased, indicating that the coir was consistently decomposed. Therefore, we could conclude that these changes of all physical and chemical properties of the coir may influence the holding capacities of water and nutrients, resulting in deterioration of quality of culture substrate of greenhouse tomatoes.
Pretransplant Hepatic Malignancy Increases Risk of De Novo Malignancy after Liver Transplantation
Gil-Chun Park,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae Yong Ha,Gi Won Song,Dong-Hwan Jung,Young-In Yoon,Hui-Dong Cho,Jae-Hyun Kwon,Yong-Kyu Chung,Sang-Hyun Kang,Jin-Uk Choi,I-Ji Jung,Sung 대한의학회 2020 Journal of Korean medical science Vol.35 No.11
Background: Hepatocellular carcinoma (HCC) recurrence and development of de novo malignancy (DNM) after liver transplantation (LT) are the major causes of late recipient death. Methods: We analyzed the incidence of extrahepatic DNM following living donor LT according to the status of pretransplant hepatic malignancy. We selected 2,076 adult patients who underwent primary LDLT during 7 years from January 2010 to December 2016. Results: The pretransplant hepatic malignancy group (n = 1,012) showed 45 cases (4.4%) of the following extrahepatic DNMs: posttransplant lymphoproliferative disease (PTLD) in 10; lung cancer in 10; stomach cancer in 6; colorectal cancer in 5; urinary bladder cancer in 3; and other cancers in 11. The pretransplant no hepatic malignancy group (n = 1,064) showed 25 cases (2.3%) of the following extrahepatic DNMs: colorectal cancer in 3; stomach cancer in 3; leukemia in 3; lung cancer in 3; PTLD in 2; prostate cancer in 2; and other cancers in 9. Incidences of extrahepatic DNM in the pretransplant hepatic malignancy and no hepatic malignancy groups were as follows: 1.1% and 0.5% at 1 year, 3.2% and 2.0% at 3 years, 4.6% and 2.5% at 5 years, and 5.4% and 2.8% at 8 years, respectively (P = 0.006). Their overall patient survival rates were as follows: 97.3% and 97.2% at 1 year, 91.6% and 95.9% at 3 years, 89.8% and 95.4% at 5 years, and 89.2% and 95.4% at 8 years, respectively (P < 0.001). Pretransplant hepatic malignancy was the only significant risk factor for posttransplant extrahepatic DNM. Conclusion: Our results suggest that patients who had pretransplant hepatic malignancy be followed up more strictly because they have a potential risk of primary hepatic malignancy recurrence as well as a higher risk of extrahepatic DNM than patients without pretransplant hepatic malignancy.
Results of living donor age of sixth decade for adult liver transplantation using a right lobe graft
Seok-Hwan Kim,Shin Hwang,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Chul-Soo Ahn,Deok-Bog Moon,Ki-Hun Kim,Gil-Chun Park,Woo-Hyoung Kang,Wan-Jun Kim,Hui-Dong Cho,Jae-Hyun Kwon,Eun-Kyung Jwa,Sung-Gyu Lee 한국간담췌외과학회 2016 한국간담췌외과학회 학술대회지 Vol.2016 No.4
Sang-Hyun Kang,Shin Hwang,Chul-Soo Ahn,Ki-Hun Kim,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Jung-Man Namgoong,Young-In Yoon,Hui-Dong Cho,Jae-Hyun Kwon,Yong-Kyu Chung,Jin Uk Ch 대한이식학회 2020 Korean Journal of Transplantation Vol.34 No.1
Background: To understand the changing demands and recent trends in the indications for living donor liver transplantation (LDLT), the present study aimed to analyze the indications for LDLT performed in a high-volume transplantation center over 10 years. Methods: The liver transplantation database at our institution was searched to identify patients who underwent LDLT during a 10-year period from January 2008 to December 2017. The study subjects (n=3,145) were divided into two groups: adult patients (n=3,019, 92.7%) and pediatric patients (n=126, 3.9%). Results: In the adult recipients, the primary diagnoses were hepatitis B virus (HBV)- associated liver cirrhosis (n=1,898, 62.9%), alcoholic liver disease (n=482, 16.0%), hepatitis C virus-associated cirrhosis (n=203, 6.7%), acute liver failure (n=127, n=4.2%), and other diseases (n=157, 5.2%). The mean Model for End-Stage Liver Disease score was 15.6±8.8 (range, 6–40). The proportion of patients with HBV-associated liver disease gradually decreased, but the proportion of those with alcoholic liver disease increased. Hepatocellular carcinoma (HCC) was diagnosed in 1,467 patients (48.6%). The mean proportion of patients with HCC was 63.1% among those with HBVassociated liver disease. In pediatric recipients, the primary diagnoses were biliary atresia (n=51, 40.5%), liver failure of various causes (n=37, 29.4%), metabolic disease (n=22, 17.5%), hepatoblastoma (n=12, 9.5%), and infectious diseases (n=4, 3.2%). Conclusions: Our results showed that there were some significant changes in the indications of LDLT. We believe that our results may reflect the real changes in the indications of LDLT and they will be useful for predicting further changes in the future.