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Modeling of CO<sub>2</sub> Emission from Soil in Greenhouse
Lee, Dong-Hoon,Lee, Kyou-Seung,Choi, Chang-Hyun,Cho, Yong-Jin,Choi, Jong-Myoung,Chung, Sun-Ok Korean Society of Horticultural Science 2012 원예과학기술지 Vol.30 No.3
Greenhouse industry has been growing in many countries due to both the advantage of stable year-round crop production and increased demand for fresh vegetables. In greenhouse cultivation, $CO_2$ concentration plays an essential role in the photosynthesis process of crops. Continuous and accurate monitoring of $CO_2$ level in the greenhouse would improve profitability and reduce environmental impact, through optimum control of greenhouse $CO_2$ enrichment and efficient crop production, as compared with the conventional management practices without monitoring and control of $CO_2$ level. In this study, a mathematical model was developed to estimate the $CO_2$ emission from soil as affected by environmental factors in greenhouses. Among various model types evaluated, a linear regression model provided the best coefficient of determination. Selected predictor variables were solar radiation and relative humidity and exponential transformation of both. As a response variable in the model, the difference between $CO_2$ concentrations at the soil surface and 5-cm depth showed are latively strong relationship with the predictor variables. Segmented regression analysis showed that better models were obtained when the entire daily dataset was divided into segments of shorter time ranges, and best models were obtained for segmented data where more variability in solar radiation and humidity were present (i.e., after sun-rise, before sun-set) than other segments. To consider time delay in the response of $CO_2$ concentration, concept of time lag was implemented in the regression analysis. As a result, there was an improvement in the performance of the models as the coefficients of determination were 0.93 and 0.87 with segmented time frames for sun-rise and sun-set periods, respectively. Validation tests of the models to predict $CO_2$ emission from soil showed that the developed empirical model would be applicable to real-time monitoring and diagnosis of significant factors for $CO_2$ enrichment in a soil-based greenhouse.
Modeling of CO₂ Emission from Soil in Greenhouse
Dong Hoon Lee,Kyou Seung Lee,Chang Hyun Choi,Yong Jin Cho,Jong-Myoung Choi,Sun-Ok Chung 한국원예학회 2012 원예과학기술지 Vol.30 No.3
Greenhouse industry has been growing in many countries due to both the advantage of stable year-round crop production and increased demand for fresh vegetables. In greenhouse cultivation, CO₂ concentration plays an essential role in the photosynthesis process of crops. Continuous and accurate monitoring of CO₂ level in the greenhouse would improve profitability and reduce environmental impact, through optimum control of greenhouse CO₂ enrichment and efficient crop production, as compared with the conventional management practices without monitoring and control of CO₂ level. In this study, a mathematical model was developed to estimate the CO₂ emission from soil as affected by environmental factors in greenhouses. Among various model types evaluated, a linear regression model provided the best coefficient of determination. Selected predictor variables were solar radiation and relative humidity and exponential transformation of both. As a response variable in the model, the difference between CO₂ concentrations at the soil surface and 5-㎝ depth showed are latively strong relationship with the predictor variables. Segmented regression analysis showed that better models were obtained when the entire daily dataset was divided into segments of shorter time ranges, and best models were obtained for segmented data where more variability in solar radiation and humidity were present (i.e., after sun-rise, before sun-set) than other segments. To consider time delay in the response of CO₂ concentration, concept of time lag was implemented in the regression analysis. As a result, there was an improvement in the performance of the models as the coefficients of determination were 0.93 and 0.87 with segmented time frames for sun-rise and sun-set periods, respectively. Validation tests of the models to predict CO₂ emission from soil showed that the developed empirical model would be applicable to real-time monitoring and diagnosis of significant factors for CO₂ enrichment in a soil-based greenhouse.
Case Report : Glyphosate Induced Severe Tubulointerstitial Nephritis Requiring Hemodialysis
( Sun Hong Yoo ),( Byung Soo Kim ),( Hye Yun Lee ),( Ja Young Lee ),( Jae Ki Choi ),( Young Soo Kim ),( Sun Ae Yoon ),( Yeong Jin Choi ),( Young Ok Kim ) 대한신장학회 2010 Kidney Research and Clinical Practice Vol.29 No.1
This is the first case of glyphosate induced severe tubulointerstitial nephritis requiring hemodialysis without cardiovascular collapse. A 67-year-old man presented to the hospital 30 minutes after ingesting 90 mL of glyphosate herbicide. On arrival, his serum creatinine was 0.8 mg/dL and other laboratory findings including liver, cardiac, and muscle enzymes were all normal. Two days after admission, although his vital signs were stable, his creatinine abruptly increased to 8.2 mg/dL and oliguria developed. As a result, we started hemodialysis treatment and two weeks after initiation of hemodialysis, his renal function started to improve slowly. After discontinuation of hemodialysis, his renal function gradually recovered and serum creatinine level decreased to 1.6 mg/dL three weeks after admission.
Choi, Sun-Hye,Kwon, Myung-Ja,Kim, Mi-Jeong,Kwon, Sun-Jin,Baek, Yeong-Ho,Song, Yeong-Ok The Korean Society of Food Science and Nutrition 2006 Preventive Nutrition and Food Science Vol.11 No.3
Freeze-dried kimchi fractions, water-soluble (WSK) versus water-insoluble (WISK), on their effects on plasma lipids and for their fibrinolytic activities were studied. Nineteen middle-aged healthy subjects were assigned to WSK, WISK, or placebo during 6 weeks of kimchi supplementation. Subjects in the WSK and WISK groups were supplemented with 3 grams of kimchi pills (equivalent to 60 grams of fresh kimchi), while the placebo group was on their normal diets. LDL/HDL and atherogenic index decreased in the subjects who received kimchi pills, but not in those in the placebo group. The levels of plasma triglyceride were significantly decreased in the WSK group compared with those in the WISK group (p<0.05). However, there was no difference in the levels of total cholesterol and HDL between the two groups. Fibrinolytic activity of WISK was significantly higher than that of WSK.
Sun Young Cho,Hyun Duk Yang,Su Jin Hwang,Ji Young Yun,Joon Ki Kim,Beum Ho Jo,Ki Wha Chung,Byung Ok Choi 한국유전학회 2007 Genes & Genomics Vol.29 No.3
Moderately elevated plasma homocysteine level is associated with an increased risk of Alzheimer`s disease. Thymidylate synthase (TYMS) and 5,10-methylenetetrahydrofolate reductase (MTHFR) are involved in the homocysteine metabolic pathway. In this study, we tried to find the association between TYMS tandem repeat polymorphism and Alzheimer`s disease. We analyzed the genotype of the TYMS and MTHFR C677T polymorphisms in 68 Alzheimer`s patients and 413 healthy controls. The mean plasma homocysteine level was higher in Alzheimer`s disease patients than in healthy controls (p < 0.05). Those subjects who carried at least one TYMS 2R allele [2R(+)] showed an increased risk of Alzheimer`s disease (AOR, 2.09; 95%CI, 1.21-4.25). However, the MTHFR C677T polymorphism was not associated with an increased risk of Alzheimer`s disease. In the comparison of the combinations of polymorphisms, the risk of Alzheimer`s disease was highest in the subjects with the [2R(+)/T(+)] combined genotypes (AOR, 2.76; 95%CI, 1.30-6.71). In conclusion, particular genotype of TYMS tandem repeat polymorphism and combined genotypes of the TYMS tandem repeat and MTHFR C677T polymorphisms appeared to be predictive genetic biomarkers for the risk of Alzheimer`s disease.
Sun-Hye Choi,Myung-Ja Kwon,Mi-Jeong Kim,Sun-Jin Kwon,Yeong-Ho Baek,Yeong-Ok Song 한국식품영양과학회 2006 Preventive Nutrition and Food Science Vol.11 No.3
Freeze-dried kimchi fractions, water-soluble (WSK) versus water-insoluble (WISK), on their effects on plasma lipids and for their fibrinolytic activities were studied. Nineteen middle-aged healthy subjects were assigned to WSK, WISK, or placebo during 6 weeks of kimchi supplementation. Subjects in the WSK and WISK groups were supplemented with 3 grams of kimchi pills (equivalent to 60 grams of fresh kimchi), while the placebo group was on their normal diets. LDL/HDL and atherogenic index decreased in the subjects who received kimchi pills, but not in those in the placebo group. The levels of plasma triglyceride were significantly decreased in the WSK group compared with those in the WISK group (p<0.05). However, there was no difference in the levels of total cholesterol and HDL between the two groups. Fibrinolytic activity of WISK was significantly higher than that of WSK.