• Korean Journal of Fisheries and Aquatic Sciences
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• v.22 no.5
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• pp.317-331
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• 1989

Chaenogobius laevis inhabit brackish waters. Adult male protects egg mass laid under the stones. The egg with small oil globule varied from 3.40 to 4.04 mm in diameter. When water temperature is $22.0\~23.0^{\circ}C$, larvae hatched about 113 hours after fertilization. The newly hatched larvae reared for 33 days grow up to 12.10 mm in total length and developed to the jevenile. When larvae length attained about 8.0 mm, jaw bones were more rapidly ossified than vertebrae and cranium.

• Journal of Food Hygiene and Safety
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• v.23 no.4
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• pp.324-329
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• 2008

An analytical method for the simultaneous determination of nine quinolones (QNs) namely, marbofloxacin, norfloxacin(IS), ciprofloxacin, danofloxacin, enrofloxacin, sarafloxacin, difloxacin, oxolinic acid, and flumequine in flatfish and egg was developed and validated using liquid chromatography with fluorescence detection (LC-FD). The samples were extracted using a traditional liquid-liquid extraction process; deproteinization was accomplished by the addition of trichloroacetic acid and acetonitrile (ACN), and defatting was performed with hexane. Chromatographic separation was achieved on a reverse phase C8 column with gradient elution using a mobile phase of 200 mM ammonium acetate buffer (pH 4.5) and ACN. The proposed method was validated according to the CODEX guideline. Mean recoveries of QNs from flatfish and egg were 89.6-106.5% with relative standard deviations (RSDs) below 15% at three different concentrations of 50, 100 and $500{\mu}g/kg$. Linearity was obtained with a correlation coefficient ($r^2$) of 0.9989-1.0000. The LOD for the investigated QNs was $1-16{\mu}g/kg$ depending on flatfish and egg. The present method can be applied simultaneously to determine QNs in muscle of flatfish and egg.

• Journal of The Korean Society of Grassland and Forage Science
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• v.22 no.1
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• pp.31-36
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• 2002

The yield and quality of winter forage crops such as oats could increase by mixed sowing with a winter legume such as hairy vetch(Vicia villosa Roth). The purpose of this study was to improve the forage quality and productivity using Oat-Hairy vetch mixture in winter season for three years. The results of this experiments were summarized as follows. In mix seeding of oat and hairy vetch, the dry matter(DM) content of herbage was 15∼16% in fall-harvest and 19∼20% in spring-harvest. Crude protein(CP) content of hairy vetch was the highest as 30.1% and the mixture was higher than that of oat. Acid detergent fiber(ADF) and neutral detergent fiber(NDF) content of hairy vetch was lower, but in vitro dry matter digestibility(IVDMD) and total dry matter digestibility(TDN) content was higher than that of oat. Although oat showed the low yield by 3.7∼4.4 DM t/ha, the Fall-seeded-Spring-harvest hairy vetch plot showed highly production by 9.5 DM t/ha. Crude protein and TDN yield of Fall-seeded-Spring-harvest plots were higher than those of others. According to this study, the highest dry matter yield could be obtained by Fall-seeded-Spring-harvest. It would be recommend in cropping field for oat.

• Journal of The Korean Society of Grassland and Forage Science
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• v.7 no.2
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• pp.92-96
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• 1987

To find out the productivity of temperate grasses on the south and north slope, a field experiment was conducted with five forage species of Cactylis glomerata, Festuca arundinacea, Phleum pratense, Agrostis gigantea and Trifolium repens. It was treated by randomized block design with 4 replications and lasted from September, 1983 to October, 1986 in Suweon. The results obtained are summarized as follows: 1. During the vegetative period for three years, the mean surface temperature and soil temperature at a depth of lOcm on the south exposure were 2.0^{\circ}C$ and 0.8^{\circ}C$ respectively higher than that of north slope, but the soil temperature between exposures were practically not different in the mid-summer season. 2. Early growth and development of forage species on the north exposure were better than that of species on the south slope. 3. Average DM yield of grasses on the north slope was much more increased than that of species on the south, however, Trifolium repens was more positive in the south. 4. Otherwise average DM yield of Dactylis glomerata and Festuca arundinacea on the north slope was a little more increased, that of Phleum pratense and Agrostis gigantea was much more increased than that of same forage species on the south.

• Korean Journal of Food Science and Technology
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• v.32 no.3
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• pp.570-577
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• 2000

A method was presented for determination of bisphenol F(BPF), bisphenol A(BPA), bisphenol F diglycidyl ether(BFDGE) and bisphenol A diglycidyl ether(BADGE) in 3 aqueous-based food simulants (water, 4% acetic acid, 20% ethanol) by reverse-phase high performance liquid chromatography(RP-HPLC)with fluorescence detection and gas chromatography with mass selective detection(GC/MSD). All the calibration lines in the range of $5{\sim}800\;{\mu}g/L$ had correlation coefficients greater than 0.9998 and detection limits of less than $1.2\;{\mu}g$ bisphenols/L. Precision at $200\;{\mu}g/L$ was under 3.1%. Recoveries of bisphenols simultaneously spiked to aqueous food simulants exceeded 95% for BPF and BPA but about 80% for BFDGE and BADGE. However, recoveris of BFDGE and BPADGE respectively spiked increased upto 95%. Detection limits in recovery test were less than $0.40\;{\mu}g$ bisphenols/L. In migration test bisphenols were determined by RP-HPLC coupled with confirmation by GC/MSD. Can coatings of epoxy phenol, modified epoxy, epoxy ester phenol and thermoset vinyl were exposed to the 3 aqueous food simulants. BPF, BFDGE and BADGE were not detected in all the can coatings but BPA was detected in 4% acetic acid and 20% ethanol in all the can coatings except modified epoxy.

• The Korean Journal of Mycology
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• v.3 no.1
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• pp.21-25
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• 1975

This is a study to determine the content of the mercury compound and the distribution of microorganisms in the waste waters flowing from the chemical plants in the Ulsan area (at 4 stations). The summary of the result of this study is as follows: 1. The content of the mercury compound has ranged from non-detection to 0.075 ppm with an average of 0.03 ppm. The highest content has been detected from the water at station A. 2. As for the distribution of the microorganisms, one species each of bacteria, Mucor, Aspergillus, Cladosporium, and Trichothecium (T. roseum); 4 species of Penicillium; and 3 species of Sterile hyphae; a total of 12 species have been isolated. 3. The following results have been found with regard to the growth of these microorganisms in terms of the content of the mercury compound. In the case of an inorganic mercury compound, most of the microbes can grow in water with a content of up to 10 ppm. Pe. sp No. 1 particularly can grow even in 50 ppm. In the case of an organic mercury compound, the growth of the microbes seems to be somewhat restrained even in 2 ppm.

• Korean Journal of Food Science and Technology
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• v.33 no.1
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• pp.1-6
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• 2001

Emulsion products with water soluble protein were exposed under light at $5^{\circ}C$ for 8 days. Peroxide value (POV) was increased significantly at the bigining of storage and 2-thiobarbituric acid (TBA) value also increased until 4 days of storage with increase of the production of carbonyl compounds, suggesting that the condition was reacted different from that of the lipid autoxidation. The reaction was similar to the flavor reversion that usually produced from the bigining of soybean oil oxidation. The reason might be the meat pigment, myoglobin, oxidation and it would be due to the singlet oxygen rather than superoxide anion. When the light was excluded general pattern was similar but the production of oxidation products were smaller than that when the sample was exposed under light. The effect of the singlet oxygen was also smaller which meant that the singlet oxygen produced during emulsion process may affect on the flavor reversion at the bigining of storage. The POV of the emulsion without water soluble protein increase gradually by storage and the results indicated that the degradation rate of the peroxides were lower than the sample with water soluble protein. Especially after 4 days of storage, production of carbonyl compounds were decreased. During storage it would be possible to produce the singlet oxygen and the sensitizer from the plants that can be produced during decoloration of soybean oil may be responsible for it. When the light was excluded the production of oxidation products were reduced at the begining of storage and the effect of quencher also was not detected. Therefore the results indicated that the light can accelerate the lipid oxidation.

• Journal of Digital Convergence
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• v.17 no.3
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• pp.323-330
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• 2019

The purpose of this study was to investigate the effect of body mass index(BMI) and waist circumference(WC) on hemoglobin(Hb) in Korean Adult. This study analyzed the data of 2015, The Sixth KNHANES. Data were analyzed using descriptive statistics, t-test, ANOVA and Scheffe's test, Pearson correlation coefficient and multivariate logistic regression analysis(SPSS 25.0). The major findings, The subject's Hb In BMI, obese was the highest(F=97.862, p<0.001). The Hb In WC, $WC{\geq}90cm$ was higher for male(t=4.909, p<0.001), and $WC{\geq}85cm$ was higher for female(t=5.088, p<0.001). Hb has a significant positive correlated with BMI(r=0.188, p<0.001), WC(r=0.298, p<0.001). In male, Hyperhemoglobinemia was 2.30 times(p<0.001) higher in obese and 1.81 times(p<0.001) higher in $WC{\geq}90cm$. In female, Hyperhemoglobinemia was 1.99 times(p=0.002) higher in overweight, 5.66 times(p<0.001) higher in obese, and 4.27 times(p<0.001) higher in $WC{\geq}85cm$. In conclusion, adult obesity prevention and management programs should include exercises, diets, and education, and exercise interventions specifically for eliminating abdominal obesity.

• Journal of Digital Convergence
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• v.20 no.4
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• pp.747-758
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• 2022

This study aimed to identify the factors that influence depression in stressed adults by age. Data were extracted from the 7th Korea National Health and Nutrition Examination Survey, covering 3,333 adults aged 20 to 59 years who were highly aware of stress. Linear regression analysis was performed using the IBM SPSS 25.0 program. The study found that in the case of people in their 20s, education level, health-related quality of life, obesity, weight change, smoking, and subjective body type were significant influencing factors, with an explanatory power of 60.3%. In the case of people in their 30s, gender, household income level, living with spouse, economic activity, health-related quality of life, food intake, obesity, alcohol consumption, smoking, and subjective health were significant influencing factors, with an explanatory power of 30.3%. For people in their 40s, household income level, living with spouse, economic activity, health-related quality of life, smoking, aerobic exercise, and subjective health were significant influencing factors, with an explanatory power of 34.4%. For people in their 50s, gender, education level, income, economic activity, health-related quality of life, protein intake, fat intake, high blood pressure, diabetes, weight control, aerobic exercise, subjective health, and subjective body type were significant influencing factors, with an explanatory power of 42.3%. Therefore, as it was found through this study that the factors affecting depression in stressed adults differ by age, it is necessary to establish an intervention strategy for each age when trying to lower depression in stressed adults.

• Korean Journal of Food Science and Technology
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• v.53 no.4
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• pp.501-508
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• 2021

The purpose of this study was to evaluate the application of ATP bioluminescence assay for effect assessment of hygiene visiting education on children's foodservice facilities in the local small town. The sanitary inspection results of the hygiene visiting education showed significant improvement in all items except 'To regularly disinfect cooking facilities, storage rooms, etc.' ATP bioluminescence analysis was performed on cooking utensils to evaluate the educational effect, and the results showed a correlation with the effect in most items. In the case of knives and cutting boards, all facilities showed a value of 20 RLU/cm² or less after the educational support, and in particular, it was approximately 10 RLU/cm² or less in national/public, corporation and private facilities. Correlation analysis between the post-education sanitary inspection results and ATP values for three items related to knives and cutting boards showed that they have a negative and high correlations.