Uncertainty was quantified to evaluate calcium determination result in infant formula with AAS (Atomic Absorption Spectrometry) and ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). Uncertainty sources in measurand, such as sample weight, final volume of sample, sample dilution and the instrumental result were identified and used as parameters for combined standard uncertainty based on the GUM (Guide to the expression of uncertainty in measurement) and Draft EURACHEM/CITAC Guide. Uncertainty components of each sources in measurand were identified as resolution, reproducibility and stability of chemical balance, standard material purity, standard material molecular weight, standard solution concentration, standard solution dilution factor, sample dilution factor, calibration curve, recovery, instrumental precision, reproducibility, and stability, Each uncertainty components were evaluated by uncertainty types and included to calculate combined uncertainty. The kinds of uncertainty sources and components in the analytical method by AAS and ICP-AES were same except sample dilution factor for AAS. The analytical results and combined standard uncertainties of calcium content were estimated within the certification range $(367{\pm}20\;mg/100g)$ of CRM (Certified Reference Material) and were not significantly different between method by AAS followed by ashing and method by ICP-AES followed by acid digestion as $359.52{\pm}23.61\;mg/100g\;and\;354.75{\pm}16.16\;mg/100g$, respectively. Identifying uncertainty sources related with precision, repeatability, stability, and maintaining proper instrumental conditions as well as personal proficiency was needed to reduce analytical error.
Journal of the Korean Society of Food Science and Nutrition
/
v.32
no.1
/
pp.124-130
/
2003
Effect of Korean red ginseng (KRG) on the level of serum and liver lipids and lipid peroxidation was investigated in the rats fed high fat diet. Content of serum total cholesterol was significantly decreased (P<0.05) in KRG I group and KRG II group. Content of HDL-cholesterol was significantly increased by 69.75% and 39.15% in KRG I and KRG II group compared to control group, respectively. Atherogenic index (hi) was also significantly decreased by 74.76% and 37.38% in KRG I and KRG II groups compared to control group, respectively. Serum triglyceride content was significantly decreased (p<0.05) in only KRG II group. Antioxidative activity of KRG on the lipid peroxidation of serum and tissues in rats was also studied in vivo by measuring the formation of thiobarbituric acid reactive substances (TBARS). Contents of TBARS in the serum of both KRG groups were significantly decreased (p<0.05) and that of nonheme iron in serum was significantly increased (p<0.05) in a dose-dependent manner, which suggested that lipid peroxidation contents are inversely correlated with serum nonheme iron content. Content of TBARS in liver was significantly decreased (p<0.05) in KRG I and KRG II groups, without any influence in other tissues. Content of TBIARS in liver microsomal fractions stimulated by Fe$^{2+}$/ascorbate was significantly decreased (p<0.05) in KRG I and KRG II groups, whereas this observation did not occur in liver mitochondrial fractions. When the effect of KRG on TBARS content in the liver fractions of homogenates, microsomes, and mitochodria stimulated by Fe$^{2+}$/ascorbate was tested in vitro experimental model, TBARS of liver three fractions was significantly decreased at 6 mg/mL KRG compared with those of control. These results suggested that KRG powder have hypocholesterolemic effect as well as antioxidative effect in the serum and liver of the rats fed high fat diet.
Journal of the Korean Society of Food Science and Nutrition
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v.12
no.3
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pp.273-283
/
1983
In order to investigate the effect of the combined dietary animal and vegetable proteins on growing female and male rats and mice. 25 female and 25 male rats of 4 weeks old weighing approximately 43-65g and 47-60g, respectively, were subjected to feeding trials for 4 weeks and then subsequently to metabolic trials for 10 days. In case of mice, 25 female and 25 male mice of 4 weeks old weighing approximately 12-17g and 12-16g, respectively, were equally treated. The dietary energy level was set as 3600 kcal ME/kg, and protein and fat provided respectively 12 and 5% of the dietary energy. The rest 83% of the energy level was supplied with appropriate amounts of starch and glucose. The following results were obtained. The body weight gain of female and male rats were increased as the combined dietary animal protein level increased. Whereas that of male mice was the highest for the diet E(Ap 10+Vp 90). Food efficiencies both of female and male rats were improved as combined dietary of animal protein increased. Male rats were superior to that of female. In the mice, the food efficiency value of male mice was superior to that of female. And the values of the male showed the same fashion as that in the growth rate, although it was not for the female. Protein efficiencies, both of female and male rats, were improved as combined dietary of animal protein level increased. That of male mice was in accord with the body weight gain and food efficiencies. But that of female mice was not accordant. Nitrogen retention of the experimental diets in the same protein level was in proportion to nitrogen intake. That of male mice was improved as animal protein level increased, but, that of female mice was not. Body protein utilizability was found to be superior in mice to rats. Blood serum protein level was not found to be affected by the experimental diets in the same protein level. The best combination ratio of animal and vegetable protein seems to be variable depending on the sex and species of animals, and the best diets for female and male rats and female and male mice were found to be experimental diet A(Ap 10+Vp 90) or diet B(Ap 75+Vp 25), diet C(Ap 50+Vp 50), and diet E(Ap 10+Vp 90), respectively. From the above-mentioned results that there was no difference in growth rate of body weight gain from the weanling period to puberty, and that the protein requirements of rats and mice were different from each other.
Factors affecting the survival of out planted Cryptomena and Japaneses Cypress seedlings. (I) - Especially on the drying and water soaking duration There are often the cases of poor survival percentage for the economic forest establishments of Cryplomeria japonica D. Don. and Chamaecyparis obtusa End. This study was carried out to investigate the survival factors of both 1-1 seedlings and Cryptomena cutting Seedlings by room drying conditions, day drying conditions, OED green water soaking treatment and drying duration at the forest nursery of Chonnam National University from February to September. 1979. The results are as follows: 1. From 11 a.m. to 3 p.m. fluctuation in then moisture contents(MC) rapidly decreased and M.C. fluctuation in indoor until 5 p.m. showed the same results with the amount of an hour fluctuation in outdoor. 2. M.C. fluctuations between OED green and non-treatment of these seedlings were silghtly different. 3. The survival percentage of OED green and non-treatment of seedlings were highly significant in the room drying conditions and the day drying conditions respectively The effects of water soaking treatment on rooting was negligible. The survival percentage of seedlings of OED green was higher than that of non-treatment. 4. Although survival percentage of Japanese Cypress was almost in accord with Cryptomena, the power of resistance to drying was lower m Japanese Cypress than m Cryptomeria. 5. Compared with Cryptomena seedlings the survival percentage of Cryptomeria cutting seedlings was higher and not influenced at all in case of being drying for two hours; but it was highly significant in interactions between the drying time and the water soaking time. 6. When Cryptomena and Japanese Cypress seedling become drying in indoor for four days, the survival percentage remarkably reduced after two days and also was highly significant among numbers of drying days.
Journal of the Korean Society of Food Science and Nutrition
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v.44
no.11
/
pp.1733-1740
/
2015
The purpose of this study was to investigate foodservice satisfaction in high school boarding students in Busan. To achieve the research objectives, a questionnaire was distributed to 357 students at four high schools in Busan. From the results, 83.8% of students ate breakfast every day, and more female students ate breakfast daily compared to male students (P<0.05). However, 53.2% of students ate 'almost-all' amounts of breakfast compared to lunch (86.6%) and dinner (87.5%). The average students' foodservice satisfaction score was 4.04/5.00. The highest satisfaction category was sanitation, followed by the service and food categories. Freshmen showed significantly higher foodservice satisfaction than junior students in terms of service (P<0.05), sanitation (P<0.05), and food categories (P<0.01). As for satisfaction of each meal, breakfast scored 3.15, lunch scored 4.04 and dinner scored 4.12, whereas male students showed significantly higher satisfaction than female students in breakfast (P<0.05) and dinner (P<0.05). Freshmen showed significantly higher satisfaction than juniors in breakfast (P<0.001), lunch (P<0.001), and dinner (P<0.001). As for meal type preference of each meal, female students strongly preferred Korean food for breakfast (P<0.01). This research suggests that it is necessary to improve breakfast satisfaction by developing a variety of menu items.
Kim, Young-Jung;Kim, Kee-Chul;Lee, Byung Sil;Lee, Gab-Yeoun;Cho, Kyoung-Jin;Kang, Jin Taek;Kim, Tae-Dong
Journal of Korean Society of Forest Science
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v.94
no.6
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pp.446-452
/
2005
In order to examine the natural distribution variations between groups of the Stewartia koreana, the leaf form characteristics of the investigation sites were analyzed by each group. As a result, the Mt. Kumsan group showed a smaller value in leaf length, width, area, and the number of veins, but not in the petiole length and serration number. Among each character, the coefficient of variation(CV) of the characters excluding petiole length and leaf area was in a comparatively narrow range, from 11.6~17.4%. On the other hand, the CV of petiole length and leaf area between the groups was 34.9% and 28.4% respectively. The CV of these characters within the group was also extraordinary- petiole length showed 29.5~42% and leaf area showed 27.7~40.7%. Also, the simple correlation analysis between 12 leaf characteristics showed that the correlation between leaf width and leaf area was high (r=0.975). The correlations between leaf length and leaf area, between leaf length and leaf width were 0.971 and 0.969, respectively. A negative correlation between angle of leaf base and ratio of leaf length to leaf width was discovered (r= -0.843), meaning that the ratio of leaf length to leaf width decreases as angle of leaf base increases. A cluster analysis was enforced among leaf characteristics of the selected group as a standard on the similarity of quantitative, qualitative measurements. The results showed that at a 0.4 distance level, the subjects could be classified into 4 groups. Group 1 was the Mt. Jogyesan and Mt. Kayasan group, group 2 was Mt. Paegunsan, group 3 was Mt. Unmunsan and Mt. Mudungsan, and group 4 was Mt. Kumsan. At a distance level of 0.6, the subjects were classified into two groups. Group 1 was the Mt. Ktimsan group and group 2 was Mt. Mudungsan, Unmunsan, Paegunsan, Kayasan, and Cogyesan. Especially the Mt. Kumsan group had the smallest value in the leaf characteristics of leaf length, width, area, and the number of veins, showing an obvious difference from the other five groups. There were five principal components that had a meaningful eigenvalue over 1.0 among the 12 extracted components. The explanatory power of the top two main components (leaf length and width) on the total variation was 52.7%. The explanatory power was 91.3% when all 5 main components were included.
The present study attempts to find the ways to efficiently manage dental caries, one of the major causes of tooth loss, and to cope with oral diseases that deteriorate oral health. For this purpose, this study seeks to obtain fundamental data needed in planning the oral health projects. The study was conducted to the first-grade elementary school students in Hwa-Seong city, Gyeonggi-do, from April 1 - 30, 2002. The result was as follows: 1) Among a total of 2,710 subjects, 598 (274 boys and 324 girls) have more than 1 permanent tooth with a caries legion whether it was treated or not. 2) The number of permanent teeth examined is 6,029, in which girls' teeth are more (3,165) than boys' (2,864). 3) Out of a total of 6,029 teeth examined, 1,106 permanent teeth (508 boys' and 598 girls') have caries legions. 4) Out of 1,106 permanent teeth with caries legions, 170 (15.4%) were treated - 67 teeth for boys (13.2%) and 103 teeth for girls (17.2%). 5) 22.1% of the children have experienced dental caries in their permanent teeth. Among them, 20.1% are boys and 24.1% are girls. 6) The rate of the permanent teeth that once had, or now have caries legions are 21.2%, among which the rate for boy's teeth is 20.1% and that for girl's teeth is 22.1%. 7) The number of the permanent teeth that had caries legions is 0.5 for all the subjects. A boy has 0.4 and a girl has 0.5 teeth with caries legions regardless of whether it was treated or not. 8) The rate of the permanent teeth with caries legions is 86.7% for overall subjects - 88.3% for boys and 85.3% for girls. 9) The rate of treated permanent teeth is 13.3% for all the subjects - 11.7% for boys and 14.7% for girls. Based on the above result, the study draws a conclusion that in order to prevent dental caries in young students and to perform an early treatment for the dental caries that already occurred an oral health office should be installed at all the elementary schools so that elementary school students don't experience a loss of time and effort for learning and suffer nutritional imbalance or disorder. Besides, the oral health education concerning the importance of dental care should be conducted to the citizens, especially to the young people, in the community as an essential project of oral health centers in the community health offices, the public medical institutions.
The purpose of this study was to provide the basic data for preventing dental caries, and maintaining and enhancing oral health. The subjects of this study were 138 male and female students who were in the 6th grade of elementary schools in Gimpo city. This study investigated the number of decayed tooth and the factors related to the number of decayed tooth, by using the results of questionnaire and oral health survey over such subjects. So, this study obtained the following conclusions. 1. For the number of decayed tooth, 'nothing(D = 0)' was the highest as 37.7%, and 'from two to three' was 23.9%, 'more than four' was 21%, and 'one' was 17.4% in order. 2. For the frequency of visiting dental clinics within the last one year, 'one to two times' was the highest as 52.2%, and the children who have not visited dental clinics even one time during one year were 23.9%. 3. For average daily tooth brushing frequency, 'two times' was the highest as 71.7%. For the use of oral health devices besides toothbrushes, 'I don't use' was the highest as 54.3%. For the experience of sealant and fluoride application, 'nothing' was the highest as 86.9% and 71.3% respectively. For the recognition on the use of fluoride dentifrice, 'I don't know' was the highest as 66.9%. 4. The socio-demographic factors related to the number of decayed tooth were mother's age, mother's background, mother's employment, and after-school fosterer(p > 0.05). 5. The oral health care factors related to the number of decayed tooth were average daily tooth brushing frequency, the use of oral health devices besides toothbrushes, and the experience of fluoride application.(p > 0.05) 6. The snack intake factors related to the number of decayed tooth were tooth care foods intake frequency and decaying foods intake frequency(p > 0.05). 7. The oral health belief item related to the number of decayed tooth was susceptibility(p > 0.05). 8. According to the results of regression analysis, the less mother was employed, the more the average daily tooth brushing frequency was, the more the tooth care foods intake frequency was, the less the decaying foods intake frequency was, and the higher susceptibility was, the lower the number of decayed tooth. 9. In order to prevent and cure early the dental caries which occur frequently in elementary school students, the establishment of oral health centers within schools should be expanded to promote tooth brushing instruction, fluoride solution rinsing, diet control, periodic oral examination.
This study was carried out an elementary school located in B-myeon and K-myeon of Gimje. One school (test group) with a school oral health care office and three schools (control group) without school oral health care offices were selected as sample schools. The dental caries prevention effects were compared between third to sixth graders who received benefits of the school continued oral health management program of K health office in Gimje, and first and second graders who did not receive the benefits due to the suspension of the program. The decayed, missing, and filled (DMF) rate, that received the benefits of the program, the test group was 58.9% and the control group was 76.1%, showing significant difference (p<0.05). For the DMF teeth (DMFT) rate, the who received benefits from the program, the test group was 41.1% and the control group was 64.2%, showing significant difference (p<0.01). For the DMFT index, the third to sixth graders that received benefits of the program, the test group was 1.73 and the control group was 3.66 showing significant difference (p<0.001). For the decayed teeth (DT) index, it was 0.72 for the test group and 1.96 for the control group showing significant difference (p<0.001). For the filled teeth index, the test group was 0.63 for the test group and 0.99 for the control group showing significant difference (p<0.05). For the DT rate, the total test group was 57.23% and 64.16% for the control group. For who received benefits from the program, the DT rate was 54.81% for the test group and 60.98% for the control group. The effects of the student continued oral health management program carried out by the oral health office can be confirmed. It is judged that efforts for continuous maintenance and promotion will be necessary to improve the oral health of students.
Journal of Dental Rehabilitation and Applied Science
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v.31
no.2
/
pp.86-95
/
2015
Purpose: The aim of the study was to evaluate the subjective symptoms and clinical signs through the TMD-questionnaire, clinical examination and radiography against the many instrumental performers and to investigate the association between playing instruments and TMDs. Materials and Methods: A total of 803 instrumental performers received TMD-related questionnaire and evaluations of prevalence and disease distribution were performed. Among those who reported at least one symptom of TMD, 70 volunteers visited in clinic then received clinical examination and radiography for diagnosis and evaluations of prevalence and disease distribution were performed. 70 subjects were divided into three groups as woodwind, brass wind, string. Comparative analysis of disease distribution was performed. Results: Among 803 instrumental performers, 610 people (75.97%) were reported to one or more symptoms of TMD. The most frequent symptom was click (29.68%).70 subjects underwent a clinical examination and radiography survey results, the most frequent symptom was a click (29.75%). Most commonly diagnosed disease was a myofacial pain (30.53%).Comparison of the three groups, a significant difference was not observed in the clinical sign. But among subject symptom, muscle pains howed significant differences in accordance with the Group (P = 0.024). During the 70 people who underwent clinical examination, 66 people (94.3%) showed moderate to severe attrition, mild to severe tongue ridging, mild to severe cheek ridging assigns of parafunction. Conclusion: Instrumental performers showed a high prevalence of TMD and the most of the musicians with temporomandibular disorder had bruxism or clenching habits.
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