Lee Eun-Jin;Kwon Young-Ju;Noh Jung-Eun;Lee Jeong-Eun;Lee Sung-Ho;Kim Jae-Keun;Kim Kwang-Soo;Choi Yong-Hee;Kwon Joong-Ho
Food Science and Preservation
/
v.12
no.6
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pp.617-623
/
2005
Response surface methodology (RSM) was applied to microwave-assisted process (MAP) extraction for effective components from Mosla dianthera M. Microwave power (2,450 MHz, 0-160 W) and extraction time (1-5 min) were used as independent variables ($X_i$) for central composite design to yield 10 different extraction conditions. Optimum conditions were predicted for dependent variables of $75\%$ ethanol extracts, such as total yield($Y_1$), total phenolics($Y_2$), total flavonoids($Y_3$), and electron donation ability($Y_4$, EDA). Determination coefficients ($R^2$) of regression equations for dependent variables ranged from 0.8397 to 0.9801, and microwave power was observed to be more influential than extraction time in MAP. The maximal values of each dependent variable predicted at different extraction conditions of microwave power (W) and extraction time (min) were as follows; $6.76\%$ of total yield at 142.00 W and 4.36 min, 78.68 mg/g of total phenolics at 136.78 W and 4.40 min, 6.75 mg/g of total flavonoids at 159,69 W and 3.17 min, and $49.81\%$ of EDA at 133.87 W and 4.47 min, respectively. The superimposed contour maps for maximizing dependent variables illustrated the MAP conditions of 79 to 113 W in power and of 2.73 to 3.84 min in extraction time.
Li, Meishan;Jang, Gwi Yeong;Lee, Sang Hoon;Kim, Sung Tae;Lee, Ji Hyun;Hwang, Se Gu;Sin, Hyun Man;Kim, Hong Sig;Kang, Tae Su;Jeong, Heon Sang
Journal of the Korean Society of Food Science and Nutrition
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v.43
no.11
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pp.1749-1756
/
2014
This study was performed to establish extraction conditions for useful components from sweet potato leaves. Extraction conditions were heating temperature ($40{\sim}60^{\circ}C$), ratio of solvent to sample (10~30 mL/g), and ethanol concentrations (50~90%). The maximum lutein content was $381.88{\mu}g/g$ under the following conditions: 81.23% ethanol concentration, $46.75^{\circ}C$ temperature, and 25.78 mL/g ratio of solvent. The maximum total polyphenol content was 58.44 mg GAE/g under 67.0%, $53.90^{\circ}C$, and 29.10 mL/g, whereas maximum total chlorophyll content was 769.14 mg/100 g under 93.10%, $69.90^{\circ}C$, and 25.98 mL/g, respectively. The highest antioxidant activity of electron-donating ability ($IC_{50}$) was 0.582 mg/mL under 64.56%, $54.63^{\circ}C$, and 19.57 mL/g, whereas total antioxidant activity was 32.54 mg AA eq/g under 64.42%, $44.51^{\circ}C$, and 26.01 mL/g, respectively. Under these conditions, experimental data matched well with the predicted data. Consequently, the present study was carried out to simulate and optimize sweet potato leaves for useful component extraction.
This study was desiged to carry out an observation study on the cognitive level of health benefitis of fermented milk and subsequntly, on prevention of gastrointestinal diseases for the consumers in Korea. Data used in this study were collected from two different source ; 1) 987 university students living in Seoul, were selected randomly and interviwed induvidual from May 25 to September 30 1994, to investigate the awareness status as a consomer of fermented milk, and 2) health benefits of fermented milk with respect to prevention gastric intestinal diseases such as typhoid fever, paratyphoid fever and bacillary dysentery in Korea with the raw data from the Yearbook of Health and Social Statistics by Ministry of Health and Social Affairs (1976${\sim}$1995) and Ministry of Agriculture, Forestry & Fisheries (1976${\sim}$1995), Republic of Korea. The results of this study were as follows : The effects of femented milk on health appeared to be attributed to taking care of an environment of the gastrointestinal tract regarding diarrhea, constipation and digestion, with showing 75.1% of male and 71.1% of female of university students in Seoul answered positively, The correlation coefficients of statistics between amounts of consumption per capita of fermented milk and incidence rates of gastrointestinal diseases during the period from 1975 to 1994 in the whole country was r = -0.308 (p<0.05). those of Seoul a major comsuming area of fermented milk in the country and Kangwon province, a minor consuming area were r = -0.704 (p<0.01) and r = +0.262 (n.s.), respectively. In conclusion, the results obtained in this study suggest that fermented milk exert its effect on gastrointestinal tract. Furthermore, the results warrant a futher study in the field of preventive medicine and health science with respect to efficacy of fermented milk consumption.
The core questions for determining nitrogen topdress rate (Npi) at panicle initiation stage (PIS) are 'how much nitrogen accumulation during the reproductive stage (PNup) is required for the target rice yield or protein content depending on the growth and nitrogen nutrition status at PIS?' and 'how can we diagnose the growth and nitrogen nutrition status easily at real time basis?'. To address these questions, two years experiments from 2001 to 2002 were done under various rates of basal, tillering, and panicle nitrogen fertilizer by employing a rice cultivar, Hwaseongbyeo. The response of grain yield and milled-rice protein content was quantified in relation to RVIgreen (green ratio vegetation index) and SPAD reading measured around PIS as indirect estimators for growth and nitrogen nutrition status, the regression models were formulated to predict PNup based on the growth and nitrogen nutrition status and Npi at PIS. Grain yield showed quadratic response to PNup, RVIgreen around PIS, and SPAD reading around PIS. The regression models to predict grain yield had a high determination coefficient of above 0.95. PNup for the maximum grain yield was estimated to be 9 to 13.5 kgN/10a within the range of RVIgreen around PIS of this experiment. decreasing with increasing RVIgreen and also to be 10 to 11 kgN/10a regardless of SPAD readings around PIS. At these PNup's the protein content of milled rice was estimated to rise above 9% that might degrade eating quality seriously Milled-rice protein content showed curve-linear increase with the increase of PNup, RVIgreen around PIS, and SPAD reading around PIS. The regression models to predict protein content had a high determination coefficient of above 0.91. PNup to control the milled-rice protein content below 7% was estimated as 6 to 8 kgN/10a within the range of RVIgreen and SPAD reading of this experiment, showing much lower values than those for the maximum grain yield. The recovery of the Npi applied at PIS ranged from 53 to 83%, increasing with the increased growth amount while decreasing with the increasing Npi. The natural nitrogen supply from PIS to harvest ranged from 2.5 to 4 kg/10a, showing quadratic relationship with the shoot dry weight or shoot nitrogen content at PIS. The regression models to estimate PNup was formulated using Npi and anyone of RVIgreen, shoot dry weight, and shoot nitrogen content at PIS as predictor variables. These models showed good fitness with determination coefficients of 0.86 to 0.95 The prescription method based on the above models predicting grain yield, protein content and PNup and its constraints were discussed.
Purpose: Recently, many hospitals have been tried to increase the satisfaction of the outpatients through blood-gathering, exam, result notice and process in a day. Each laboratory has been used the automatic equipment for the rapid requests of the result notice and the increase of the reliability and efficiency. Current automatic equipments that have been limited short TAT(Turn-Around Time)because of the restricted batch lists and 1 tip-5 detectors. The Gamma Pro which is made in Korea to improve the shortcomings of existing automation equipment, complemented with capacity to perform a wide range of domestic automation equipment. In this study, we evaluated the usefulness and reliability of short TAT by comparing Gamma Pro with current automatic equipment. Materials and Methods: We studied the correlation between Gamma Pro and RIA-mat 280 using the respective 100 specimens of low or high density to the patients who were requested the thyroid hormone test (Total T3, TSH and Free T4) in Samsung Medical Center Sep. 2009. To evaluate the split-level Gamma Pro, First, we measured accuracy and carry over on the tips. Second, the condition of optimal incubation was measured by the RPM (Revolution Per Minute) and revolution axis diameter on the incubator. For the analysis for the speed of the specimen-processing, TAT was investigated with the results in a certain time. Result: The correlation coefficients (R2) between the Gamma Pro and RIA-mat 280 showed a good correlation as T3 (0.98), TSH (0.99), FT4 (0.92). The coefficient of variation (C.V) and accuracy was 0.38 % and 98.3 % at tip 1 and 0.39 % and 98.6 % at tip 2. Carry over showed 0.80 % and 1.04% at tip 1 and tip 2, respectively. These results indicate that tips had no effect on carry over contamination. At the incubator condition, we found that the optimal condition was 1.0mm of diameter at 600RPM in 1.0mm and 1.5mm of at 500RPM or 1.0mm and 1.5 mm of diameter at 600 RPM. the Gamma Pro showed that the number of exam times were increased as maximum 20 times/day comparing to 6 times/day by current automatic equipment. These results also led to the short TAT from 4.20 hour to 2.19 hours in whole processing. Conclusion: The correlation of between the Gamma Pro and RIA-mat 280 was good and has not carry over contamination in tips. The domestic automation equipment (Gamma Pro) decreases the TAT in whole test comparing to RIA-280. These results demonstrate that Gamma Pro has a good efficiency, reliability and practical usefulness, which may contribute to the excellent skill to process the large scale specimens.
Kim, Ji-Hyun;Jee, Cho-Hee;Won, Jin-Hee;Jung, Hae-Won;Moon, Jong-Hyun;Cho, Kyu-Woan;Kang, Byeong-Teck;Jung, Dong-In
Journal of Veterinary Clinics
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v.31
no.2
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pp.77-84
/
2014
The present study evaluated that responses of peripheral and bone marrow depends on the frequency of recombinant human granulocyte colony-stimulating factor (rhG-CSF) administration in dogs. The rhG-CSF has been revealed that have a beneficial effect for dogs with myelosuppression secondary to chemotherapy or radiation but there were no studies about the frequency of administration in dogs. In this research, rhG-CSF was administrated $5{\mu}g/kg$ subcutaneously for each two-dogs group as follows: (1) every day for trial, (2) every other day for trial, (3) every third day for trial. The peripheral blood analysis including direct microscopic differential counts of one hundred cells was performed every day. Bone marrow aspiration was performed before administration of rh G-CSF, on the day of 0, 3, 9 and when the WBC counts were decreased within the normal range (day 12 or 13). Rh G-CSF was well-tolerated and showed no side effects in all dogs. According to the present study, $5{\mu}g/kg$ administration of rhG-CSF have cell-specific, frequency-related effect on bone marrow and peripheral blood. Furthermore, the effects of rhG-CSF administration on bone marrow sustained during the study and prolonged at least 3 days after discontinuing of rhG-CSF treatment.
This study was conducted to investigate changes in inorganic phosphorus fractions in phosphorus accumulated plastic film house soils under cropping condition. Pot experiment was conducted with surface soils taken from plastic film house fields cultivated for 3, 8 and 16 years. Phosphorus fertilizer was applied at the rates of 0 (P0), $100kg\;ha^{-1}$ (recommended application rate. P1) and $200kg\;ha^{-1}$ (P2) as fused phosphate. Crops were grown sequentially in the order of corn-Chinese cabbage-Chinese cabbage-corn for 3 years. The content of easily soluble-P fraction was decreased with cropping. There were significantly positive relationship not only between the contents of easily soluble-P and the amounts of soil available P ($r=0.839^{**}{\sim}0.952^{**}$ for Bray-1 P, $r=0.895^{**}{\sim}0.967^{**}$ for Lancaster P, and $r=0.491^{**}{\sim}0.821^{**}$ for Olsen P), but also between the amounts of P absorbed by plants and the amounts of easily soluble P decreased ($r=0.644^{**}{\sim}0.822^{**}$). The decrease of easily soluble-P during cropping period could be described by a first-order reaction. The number of cropping times needed to decrease the content of easily soluble-P to an index level of $0.2mg\;kg^{-1}$, which is commonly reported as the desired concentration for soil P, was predicted in the range of 26~33 cropping times by using the equations. Regardless of P fertilization, the proportion of Al-P to total P was little varied during cropping period, but the proportion of Fe-P to total P increased with cropping. Although the content of Ca-P was high before cropping, the proportion of Ca-P to total P was increased with cropping. The proportion of reductant soluble-P to total P was little varied for P fertilizer treatment but was increased for no P fertilizer treatment. The residual-P was decreased during cropping period due to the absorption by crops and the conversion to other inorganic P fractions.
Objectives : The purpose of this study was to determine the validity and reliablity of the Korean version of the Global Assessment of Recent Stress(GARS) Scale developed for assessing the severity of current perceived stressors, and then to use the scale in clinical practice. Methods : The questionnaire was completed by 215 healthy subjects. A comparison was made regarding the perception of stressors among 242 patients(71 with anxiety disorder, 73 with depressive disorder, 47 with somatoform disorder, and 51 with psychosomatic disorder) and 215 healthy subjects. Factor analysis was done using oblique rotation after maximum-likelihood factor analysis. Results : Factor analysis yielded 1 subscale. Reliability was computed by administering the GARS Scale to 69 healthy subjects during a 2-week interval. Test-retest reliability for 8 items and the total score was significantly high, ranging between 0.85-.95. Internal consistency was significant(Cronbach's a for 7 items : .86). Convergent validity was computed by correlating the 8 items and the total score with the total score of the stress response inventory(SRI), the perceived stress questionnaire(PSQ), and the somatization, anxiety, depression, hostility subscales and general indices of the symptom checklist-90-revised(SCL-90-R). The correlations were all at significant levels. Discriminant validity was computed by comparing the 8 item scores of the patient and control groups. Significant differences were found in area relevant to sickness or illness and the overill global area. The patients with anxiety disorder were significantly higher in area relevant to sickness or illness than the healthy group, whereas the patients with depressive disorder was significantly higher in the overall global score than healthy group. The depressive disorder group was the highest in overall global score of the GARS scale among 4 patient groups, and showed a significant higher scores in interpersonal relationship and overall global area than the psychosomatic disorder group. Conclusions : These results indicate that the Korean version of the GARS scale is highly reliable and valid, and that it can be utilized as an effective measure of perceived stressors for research in stress-related fields. It is suggested that depressive disorder patients are more likely to perceive recent stressors than psychosomatic disorder patients.
Journal of the Korean Society of Marine Environment & Safety
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v.21
no.2
/
pp.188-193
/
2015
It has been generally recognized that $N_2O$(Nitrous Oxide) emission from marine diesel engines has a close correlation with $SO_2$(Sulfur Dioxide) emission, and diversity of fuel elements using ships affects characteristics of the $N_2O$ emission. According to recent reports, in case of existence of an enough large NO(Nitric Oxide) generated as fuel combustion, effect of the $SO_2$ emission in exhaust gas on the $N_2O$ formation is more vast than effect of the NO. Therefore, $N_2O$ formation due to the $SO_2$ element operates on a important factor in EGR(Exhaust Gas Recirculation) systems for NOx reduction. An aim of this experimental study is to investigate that intake gas of the diesel engine with increasing of $SO_2$ flow rate affects $N_2O$ emission in exhaust gas. A test engine using this experiment was a 4-stroke direct injection diesel engine with maximum output of 12 kW at 2600rpm, and operating condition was set up at a 75% load. A standard $SO_2$ gas with 0.499%($m^3/m^3$) was used for changing of $SO_2$ concentration in intake gas. In conclusion, the diesel fuel included out sulfur elements did mot emit the $SO_2$ emission, and the $SO_2$ emission in exhaust gas according as increment of the $SO_2$ standard gas had almost the same ratio compared with $SO_2$ rate in mixture inlet gas. Furthermore, the $N_2O$ element in exhaust gas was formed as $SO_2$ mixture in intake gas because increment of $SO_2$ flow rate in intake gas increased $N_2O$ emission. Hence, diesel fuels included sulfur compounds were combined into $SO_2$ in combustion, and $N_2O$ in exhaust gas should be generated to react with NO and $SO_2$ which exist in a combustion chamber.
Journal of Korean Society of Environmental Engineers
/
v.28
no.12
/
pp.1337-1346
/
2006
Soil humin is the insoluble fraction of humic materials and play an important roles in the irreversible sorption of hydrophobic organic contaminants onto soil particles. However, there have been limited knowledge about the sorption and chemical properties of humin due to the difficulties in its separation from the inorganic matrix(mainly clays and oxides). In this study, de-ashed soil humins($Hu_1-Hu_6$) were isolated from a soil residues(Crude Hu) after removing alkali-soluble organic fractions followed by consecutive dissolution of the mineral matrix with 2%-HF for 2 hr. The humin samples were characterized by elemental analysis and $^{13}C$ NMR spectroscopic method and their sorption-desorption behavior for 1-naphthol were investigated from aqueous solution. The results were compared one another and that with peat humin. $^{13}C$ NMR spectra features indicate that the soil humin molecules are mainly made up of aliphatic carbons(>80% in total carbon) including carbohydrate, methylene chain. Freundlich sorption parameter, n was increased from 0.538 to 0.697 and organic carbon-normalized sorption coefficient(log $K_{OC}$) values also increased from 2.43 to 2.74 as inorganic matrix of the soil humin removed by HF de-ashing. The results suggest that inorganic phase in humin plays an important, indirect role in 1-naphthol sorption and the effects on the sorption non-linearity and intensity are analyzed by comparison between the results of soil humin and peat humin. Sorption-desorption hysteresis were also observed in all the humin samples and hysteresis index(HI) at low solute concentration($C_e$=0.1 mg/L) are in order of Peat humin(2.67)>De-ashed humin(0.74)>Crude Hu(0.59).
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