Kim Kyoung-Ho;Yun Seong-Taek;Chae Gi-Tak;Kim Seong-Yong;Kwon Jang-Soon;Koh Yong-Kwon
Economic and Environmental Geology
/
v.39
no.1
s.176
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pp.27-38
/
2006
To understand the geologic and hydrogeochemical controls on the occurrence of high fluoride concentrations in bedrock groundwaters of South Korea, we examined a total of 367 hydrochemistry data obtained from deep groundwater wells (avg. depth=600 m) that were drilled fur exploitation of hot springs. The fluoride concentrations were generally very high (avg. 5.65mg/L) and exceeded the Drinking Water Standard (1.5 mg/L) in $72\%$ of the samples. A significant geologic control of fluoride concentrations was observed: the highest concentrations occur in the areas of granitoids and granitic gneiss, while the lowest concentrations in the areas of volcanic and sedimentary rocks. In relation to the hydrochemical facies, alkaline $Na-HCO_3$ type waters had remarkably higher F concentrations than circum-neutral to slightly alkaline $Ca-HCO_3$ type waters. The prolonged water-rock interaction occurring during the deep circulation of groundwater in the areas of granitoids and granitic gneiss is considered most important for the generation of high F concentrations. Under such condition, fluoride-rich groundwaters are likely formed through hydrogeochemical processes consisting of the removal of Ca from groundwater via calcite precipitation and/or cation exchange and the successive dissolution of plagioclase and F-bearing hydroxyl minerals (esp. biotite). Thus, groundwaters with high pH and very high Na/Ca ratio within granitoids and granitic gneiss are likely most vulnerable to the water supply problem related to enriched fluorine.
The upland soils (56 samples) from organic farms in Gyeonggi-do (12 sites), Gangwon-do (8 sites), Chungcheong-do (14 sites), Gyeongsang-do (4 sites), Jeollado (18 sites) in Korea were collected and their physical and chemical properties were analyzed by RDA's methods. In the results of physical property, the bulk density of soils averaged $1.14Mgm^{-3}$ (surface soil), $1.38Mgm^{-3}$ (subsoil), respectively. The porosity of them was 57%, 48%. Organically managed soil's (OS) bulk density was lower than conventional soil's but OS's porosity was a little higher than conventionally managed soil in surface soil. The depth of plough layer in organically managed soils was 21.2 cm indicating that the organic farming had good effect on soil physical property. In the results of chemical property, the surface soil pH was 6.9 and the contents of organic matter (OM) was $26gkg^{-1}$, available phosphate (Avail. $P_2O_5$) was $554mgkg^{-1}$, exchangeable calcium (Exch. Ca) was $8.9cmol_ckg^{-1}$, exchangeable potassium (Exch. K) was $0.89cmol_ckg^{-1}$, exchangeable magnesium (Exch. Mg) was $2.0cmol_ckg^{-1}$. The subsoil pH was 6.8 and the contents of OM was $21gkg^{-1}$, avail. $P_2O_5$ was $491mgkg^{-1}$, exch. Ca was $7.9cmol_ckg^{-1}$, exch. K was $0.68cmol_ckg^{-1}$, exch. Mg was $1.8cmol_ckg^{-1}$. The nutrient accumulation emerged in organic farming. Compared to the optimum nutrient range for the conventional upland soils, the exceed rate of pH, OM, available phosphate, and exchangeable Ca, K, and Mg was 79, 52, 64, 84, 66% and 55%, respectively, which mainly resulted from the over-application of lime materials or livestock manure compost. With these results it is suggested that organic farm need to reduce the use of inputs, which make soil alkalification or nutrient accumulation. More study on effects of inputs on lowering soil pH from alkalification could help organically managed soil to be improved.
The adsorption characteristics of sodium chloride into Ca-alginate beads have been investigated and the result were as follows: Sodium chloride uptake by Ca-alginate beads increased with time. The highest uptake volume of sodium chloride was 4.2g after 10 minutes. The uptake volume by Fe, Ca, Ba, and Sr-alginate beads was 5.6g, 4.2g, 4.2g and 4.0g, respectively but in case of Fe-alginate beads, the induced hydrogel beads were very fragile and the strength of Fe-alginate beads were weaker than Ca- and Ba-alginate beads. Mg-alginate bead was not formed and Ca-, Ba- and Sr-alginate beads had a similar uptake volume about 4.2g, respectively. The uptake volume of sodium chloride by CaCl$_2$concentration(0.1M. 0.2M and 1M), curing solution, was 4.8, 4.2g and 4.1g, respectively. The uptake volume by sodium alginate concentration(0.6%, 1% and 2%) was 2.8g, 4.0g, and 4.4g, respectively and Ca-alginate bead size was not effected in uptake sodium chloride. The uptake rate on initial sodium chloride concentration(4%, 8%, 12% and 16%) was 30%, 28%, 27% and 25%, respectively. The uptake rate on basic pH(10.0) was higher than when compared to other neutral pH(6.8) and acidic pH(4.0). The initial uptake velocity of sodium chloride from immobilization beads with salt resistant bacteria was lower than that of non-immobilization beads. The uptake rate of sodium chloride was decreased according to elongation of curing time. Reusability of Ca-alginate beads was possible but according to reutilization, the salt uptake volume of beads was also decreased. The uptake volume of sodium chloride from Doengjang by Ca-alginate beads on time course(3, 6, 12, and 24 hour) was revealed 5g, 6g, 7g and 7g, respectively.
This study was performed to examine the health risks according to the obesity types based upon body mass index (BMI) and waist circumference (WC) cutoffs. The subjects were 8,966 adults aged 40-79 years from the 1998, 2001 and 2005 Korean National Health and Nutrition Examination Surveys. The subjects were classified into 4 types of obesity groups based on BMI and WC: BMIWC (BMI${\geq}$ 25 kg/$m^2$ and WC${\geq}$ 90 cm for males and ${\geq}$ 85 cm for females), WC (BMI < 25 kg/$m^2$ and ${\geq}$ 90 cm for males and ${\geq}$ 85 cm for females), BMI (BMI ${\geq}$ 25 kg/$m^2$ and < 90 cm for males and < 85 cm for females), normal (BMI < 25 kg/$m^2$ and < 90 cm for males and < 85 cm for females) groups. More than half (n = 5,103) of the subjects fell into the normal group and BMIWC group accounts for 58%, followed by BMI group of 27% and WC group of 16%. Mean ages of subjects were highest in WC group and lowest in BMI group. Blood levels of total cholesterol, triglyceride, LDL-cholesterol and glucose, and blood pressures were higher and HDL-cholesterol was lower in 3 types of obesity groups (BMIWC, WC, BMI) than in the normal group. Among the 3 obesity groups, energy and fat intake was significantly higher in BMIWC than in normal group in males, however, no differences were found among the 4 groups in females. The three obesity groups had greater odds ratios for hypertension, diabetes mellitus, hypercholesterolemia, hyper-LDL-cholesterolemia, hypo-HDL-cholesterolemia, hypertriglyceridemia, and metabolic syndrome compared to the normal group. Among 3 obesity groups, BMIWC group had the highest odds ratios for hypertension, diabetes mellitus, and metabolic syndrome. Especially BMIWC and WC groups showed the highest odds ratios for diabetes mellitus and metabolic syndrome, suggesting the potential role of abdominal obesity in diabetes mellitus and metabolic syndrome. Our data indicate that different types of obesity may show different degrees of health risks. The appropriate selection and use of obesity indexes may be effective for management of obesity as well as obesityrelated diseases.
The effects of fractions of ethanol extract of Benincasa hispida (wax gourd) on lipid levels and lipid peroxidation in streptozotocin (STZ) induced diabetic rats were examined. Sprague-Dawley rats were induced diabetes mellitus by STZ injection (45 mg/kg) into the tail vein and were divided into 5 groups: normal, STZ-control, three experimental diabetic groups [chloroform $(CHCl_3)$ fraction group, butanol (BuOH) fraction group, and water fraction group]. Fractions of ethanol extract of Benincasa hispida were administered orally into the diabetic rats for 14 days. The liver glycogen levels of $CHCl_3$ fraction group and the muscle glycogen levels of BuOH and water fraction groups were significantly higher than that of STZ-control group. Pancreas protein levels of BuOH and water fraction groups were significantly higher than that of STZ-control group. The liver cholesterol level of BuOH and water fraction groups were significantly lower when compared with the STZ-control group. The level of liver triglyceride in BuOH and water fraction groups were significantly higher than that of STZ-control group. Malondialdehyde (MDA) levels in liver of normal and diabetic groups were not significantly different. In the pancreas, the MDA levels of BuOH and water fraction group were significantly lower than that of STZ-control group. The results suggested that the supplementation of the BuOH and water fractions of Benincasa hispida extract could be beneficial for the diabetic complications and damages from the lipid peroxidation.
Journal of the Korean Society of Food Science and Nutrition
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v.41
no.3
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pp.351-361
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2012
This study was carried out to compare the differences in dietary habits, food consumption patterns, nutrient intakes, and serum lipid levels according to kimchi consumption in college students. The anthropometric and biochemical parameters of blood samples from the subjects were investigated, as well as a kimchi frequency questionnaire, 24-hour food recall and dietary habits. The subjects were divided into two groups according to their kimchi consumption level based on the quantitative kimchi frequency questionnaire-kimchi consumption under 50 g group and kimchi consumption over 50 g group. As kimchi consumption increased, consumption of white rice (p<0.05) and noodles increased, whereas the consumption of confections decreased. The kimchi consumption over 50 g group was more likely to eat balance meals (p<0.05), and consume fruits and vegetables (p<0.05) than the other group. On the other hand, the kimchi consumption under 50 g group was more likely to consume milk than the kimchi consumption over 50 g group. The energy and sodium (p<0.05) intakes in the kimchi consumption over 50 g group were higher compared to the kimchi consumption under 50 g group. Kimchi consumption was positively correlated with HDL-cholesterol and negatively correlated with body fat, BMI, and blood glucose level. In addition, kimchi consumption was positively correlated with cereals, meats, and vegetables intakes, and negatively correlated with milk and dairy product intakes. However, there was no significant difference between the two groups.
Park, Ju-Hun;Lee, Kyoung-Won;Sung, Ki-Seung;Kim, Sung-Soo;Cho, Kyung-Dong;Lee, Bog-Hieu;Han, Chan-Kyu
Journal of the Korean Society of Food Science and Nutrition
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v.41
no.6
/
pp.766-773
/
2012
This study investigates the effects of diets with mulberry leaf and Cudrania tricuspidata leaf supplements on blood glucose-related biomarkers in streptozotocin-induced diabetic rats. Male diabetic Sprague-Dawley rats were divided into groups and fed several diets. Group A was fed a diet with a 10% supplement of mulberry leaves. Group B was fed a diet with a 10% supplement of mulberry leaves and an additional 10% supplement of Cudrania tricuspidata leaves. Group C was fed a diet with a 10% supplement of mulberry leaves and an additional 30% supplement of Cudrania tricuspidata leaves. Group D was fed a diet with a 10% supplement of Cudrania tricuspidata leaves. Group E was the DM control. All diets were based on AIN-93G diet and they all lasted 6 weeks. The blood glucose levels of groups B and C stayed similar to initial levels (reference blood glucose) for the experimental period, which was significantly lower than levels in groups A, D, and E at the 6th week (p<0.05). And the area under the blood glucose curve (AUC) was also significantly lower in groups B and C than in groups D and E (p<0.05). The fasting blood glucose level after the experiment was significantly lower in groups B and C (p<0.05), and the C-peptide content of group C was as high as 50 pmol/L on average. The HbA1c content was also significantly lower in groups A and B than in group E (p<0.05). The serum TG, AST, and ALT levels were significantly decreased in groups A, B, and D than in group E (p<0.05). From the findings, it is shown that a diet of 1:1 mulberry and Cudrania tricuspidata leaf supplements could improve blood glucose-related biomarkers.
Journal of the Korean Society of Food Science and Nutrition
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v.29
no.3
/
pp.466-470
/
2000
The current study was undertaken to determine the prolinged effects of fasting-refecding on the lipoprotein lipase (LPL) activity and lipogenesis of adipose tissus in male Sprague-Dawley rals and to investigate the effects of various degrecs of food restriction during refeeding on the LPL activity and lipogenesis. The control group (n=5) was fed ad libitum and killed in the fed state at the beginning of the experiment. All rats except conteol group were fasted for 2 days (n=50). Five rats were killed at the end of fasting and others (n=45) were refed either ad libitum (ad libitum group) or mildly restricted (20% food restricted group), or esverely restricted diet (40% food restricted group). Rats were killed on the day of 7th, 14th, and 21st of refeeding. Lipogenesis was determined by the amount of glucose converted to the total lipid. Body weight and epididymal adipose tissue weight returned to control states by 5 days in ad libitym group and by 14 days in 20% food restricted group. As expected, in 40% food restriction during refeeding weight and epididymal adipose tissue weight did not rcturn to control states until day 21. On day 21 after refeeding, the serum total cholesterol concentration of ad libitum group was significantly (p<0.05) higher than that of control group. The serum HDL-C concentration of 40% food restricted group during refeeding was significantly (p<0.05) higher than that of control group. However, there were no significant dif-ferences in serum HDL-C/total cholesterol (TC) ratio and trigluceride concentration among the groups. Fasting for 2 days decreased lipogenesis and LPL activity (p<0.05). On day 21 after refecding, the lipogencsis of ad libitum group was significantly (p<0.05) lower than that of control group. The lipogenesis of 40% food restricted group during refeeding was significantly (p<0.05) higher than that of conrtol group. Ad libitum group and 20% food restricted group during refecding allowed heparin-releasable (HR) LPL or total extractable (TE) LPL activity to return to control states. 40% food restricted group during refeeding delayed the return of HR-LOL or TE-LPL activity to return to control states until day 21 of refeeding. These results suggest that food restriction during refeeding can partially or completely prevent the overshoot of LPL activity, and this may influence the rate of lipid accumulation in adipose tissue during refeeding.
Journal of the Korean Society of Food Science and Nutrition
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v.30
no.2
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pp.350-356
/
2001
The purpose of this study is to verify the relation among vegetarian diet, physical activity and the risk factors of cardiovascular disease. Two hundred and forty five buddhist nuns (age : 23~79 yrs) were selected as vegetarians. For control subjects, 235 healthy female adults (age : 23~79 yrs) were selected. Study period was from October 1996 to February 1997. The contents are consist of food consumption survey, anthropometric measurement, amount of energy expenditure, physical activity and clinical examination. Results were summarized as follows : The average ages of vegetarians were $44.2{\pm}17.3\;yrs$ and those of non-vegetarians were $40.5{\pm}18.4\;yrs$. Average body mass indices (BMI) of vegetarians and non-vegetarians were $22.5{\pm}2.7\;and\;21.1{\pm}2.5$, WHRs were $0.9{\pm}0.1\;and\;0.8{\pm}0.1$, and the average duration of vegetarian diet of the vegetarians was 13.1{\pm}12.9 years. All the nutrient intakes of both groups were over RDA's except calcium and vitamin A intakes of non-vegetarians that were below RDA's Fiber and vitamin C intakes of the vegetarians were significantly higher than those of non-vegetarians (p<0.01). Average energy intakes of vegetarians and non-vegetarians were $2177.1{\pm}420.6\;kcal/day\;and\;2103.2{\pm}534.9\;kcal/day$, total daily energy expenditure were $1789.9{\pm}325.8\;kcal/day\;and\;1703.8{\pm}344.8\;kcal/day$, those by physical activity were $507.8{\pm}360.9\;kcal/day\;and\;400.0{\pm}247.8\;kcal/day$. Serum lipid level, blood sugar, systolic blood pressure of vegetarians were significantly lower than those of non-vegetarians, but ratio of HDL-cholesterol/total-cholesterol was higher than those of non-vegetarians. Levels of total serum cholesterol of vegetarians and non-vegetarians were 161.4{\pm}33.3 mg/dL and 189.6{\pm}33.6mg/dL, HDL-cholesterol were $48.2{\pm}11.4\;mg/dL\;and\;50.8{\pm}12.2\;mg/dL$, LDL-cholesterol were $86.6{\pm}26.9\;mg/dL\;and\;111.1{\pm}17.0\;mg/dL$, atherogenic indice(AI) were $2.4{\pm}0.6\;and\;2.9{\pm}0.7$, fasting blood sugar were $90.8{\pm}14.3\;mg/dL\;and\;103.6{\pm}24.6\;mg/dL$, systolic blood pressure were $107.5{\pm}14.9\;mmHg\;and\;119.3{\pm}15.3\;mmHg$. Energy expenditure by physical activity was negatively correlated with levels of serum total-cholesterol and LDL-cholesterol and atherogenic indice(AI). Therefore, physical activity and vegetarian diet effectively helped reduce blood lipids related to cardiovascular disease.
Journal of the Korean Society of Food Science and Nutrition
/
v.35
no.6
/
pp.683-689
/
2006
This study was established to investigate the effect of germanium-fortified yeasts on the serum lipid composition and immune system of human body. All 50 subjects with the age range of $50{\sim}75$ were entered in this clinical trial for 6 months. The effects were determined by the proliferative responses of immune-mediated cells, T-cell, B-cell and NK-cell during daily supplementation with/without germanium-fortified yeast. The results of hematology and blood chemistry didn't show any significant differences during administration periods. Serum lipid compositions also didn't show any significant differences during administration periods except triglyceride (TG) and VLDL-cholesterol. TG and VLDL-cholesterol levels were increased significantly by the consumption of germanium-fortified yeast (p<0.05). Immune mediated T-celt and NK-cell didn't increased in both control and test group supplemented with germanium fortified yeast, while B-cell increased in the germanium fortified yeast group after 8 week (p<0.05). Also $TNF-{\alpha}$ increased in the group of germanium fortified yeast after 8 week (p<0.05) but not in the control group. From the above results, germanium fortified yeast is expected to be useful on the improvement of the cellular immune response and protection of organs from various chronic diseases.
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