• Korean journal of food and cookery science
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• v.22 no.5 s.95
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• pp.642-649
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• 2006

The browning of soy sauce is caused by the reaction of amino-carbonyl between amino-compounds and reducing sugar. Only a few studies have investigated the formation of melanoidins in UHYUKJANG. The objectives of this study were to analyze the brown pigment of UHYUKJANG and to investigate the characteristics of UHYUKJANG in comparison with soy sauce and model melanoidins. The samples were ripened for 0, 60, 120, 180, 240, 300 and 360 days at 4$^{\circ}C$ and 20$^{\circ}C$. The pH, absorbance at 420 nm absorbance ratio of 400 to 500 nm and UV-VIS spectra as an index of color intensity were measured. Additionally, L, a and b values of the samples and the amount of 3-Deoxyglucosone(3DG) in the samples were measured. The pH of both soy sauce (from 6.26 to 5.52) and UHYUKJANG (from 6.13 to 5.11) rapidly decreased during the first 60 days of aging and was also affected by storage temperature. The absorbance of samples at 420 nm increased during the aging process, reaching its maximum after 180 days, regardless of sample and temperature. On the other hand, the intensity of brown color in the samples increased with increasing aging period according to the results of absorbance ratio (soy sauce: 1.37 to 5.29, UHYUKJANG: 1.37 to 5.02). The L value of soy sauce increased during the aging process and was maximized after 240 days at 4$^{\circ}C$ and 180 days at 20$^{\circ}C$, but decreased thereafter. There was no significant difference in L value of UHYUKJANG, regardless of aging period and temperature. On the other hand, the b value did not reveal any significant change during aging, but the a value increased until 120 days of aging in the other samples except for UHYUKJANG at 20$^{\circ}C$. The average amount of 3DG separated from soy sauce was 5.65 mg%, and from UHYUKJANG was 3.74 mg%. These results indicated that the browning of UHYUKJANG was also caused by melanoidins produced by the reaction of amino-carbonyl during the fermentation process.

• Korean journal of applied entomology
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• v.48 no.4
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• pp.541-546
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• 2009

The egg size and weight of the gray field slug, Deroceras reticulatum Muller, was $1.91{\times}2.19$ mm and 3.3 mg at $24^{\circ}C$, respectively. Its weight increased from newly laid eggs to adults for 17 weeks at four temperature regimes and was heaviest at $20^{\circ}C$, followed by 24, 16 and $28^{\circ}C$. Likewise, hatching rate of the egg batches was highest with 95% at $20^{\circ}C$, followed by 24, 16 and $28^{\circ}C$ with significant differences. The number of eggs in the batches was increased with 20 at $20^{\circ}C$ while it was only 10 at $28^{\circ}C$. The average accumulated egg-laying days was longest with 15 days at $20^{\circ}C$ while shortest with 9 days at $24^{\circ}C$. The range of egg-laying period was shortest with 84-134 days at $16^{\circ}C$ and longest at $20^{\circ}C$. Thus, the total number of eggs laid by adult D. reticulatum was highest with 217 at $20^{\circ}C$ and lowest with 105 at $16^{\circ}C$. The egg period was 12-19 days while the juvenile period and adult longevity were 51-68 days and 85-134 days, respectively. The life span of D. reticulatum from egg to adult was longest with 216 days at $20^{\circ}C$, followed by 193 days at $24^{\circ}C$, 170 days at $16^{\circ}C$ and 151 days at $28^{\circ}C$. Accordingly, the most favorable temperature for the oviposition, development and longevity of D. reticulatum is $20^{\circ}C$.

• Korean Journal of Ichthyology
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• v.10 no.1
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• pp.106-114
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• 1998

In order to estimate energy budget of the rockfish, Sebastes schlegeli juvenile, during the period from parturition to juvenile, of rockfish were reared at constant condition of water temperature($16^{\circ}C$ and $20^{\circ}C$). Energy used by the reared juveniles were calculated from estimates of data on growth, oxygen consumption, nitrogen excretion, feeding and energy content. After parturition, total length of juvenile was 4.56~5.49mm(average 4.97mm, n=20), and the average dally growth rates were 0.50mm at $20^{\circ}C$. The weight-specific oxygen consumption and nitrogen excretion rates decreased with increasing body weight. Temperature significantly affected oxygen consumption and nitrogen execretion rates, with the higher rates at $20^{\circ}C$ than $16^{\circ}C$. During the 25 days from parturition to jllveniles, feeding rates were 65.8cal at $16^{\circ}C$, and 89.2cal at $20^{\circ}C$. The assimilation effeciency estimated by nitrogen content of food and egested feces were 85.21% at $16^{\circ}C$ and $20^{\circ}C$. During the period from parturition to juvenile, energy was used the higher in body growth than in oxygen consumption. The gross growth efficiencies($K_1$)and net growth efficiencies($K_2$) of the rockfish, Sebastes schlegeli juvenile ranged from 43% to 47% and from 50% to 55%, respectively.

• Journal of The Korean Society of Grassland and Forage Science
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• v.14 no.3
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• pp.186-194
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• 1994

Lack of seedling vigor is considered a serious deterrent to use of broadleafed birdsfoot trefoil (Lorus comicul~rus L.). Our objectives were to compare early seedling growth of broadleafed birdsfoot trefoil cultivar "MO-20" and the large-seeded accession 302921 at $15^{\circ}C$ and $25^{\circ}C$. in controlled-environment chambers. Cabon dioxide exchange rate (CER) was measured in a closed or open system using infrared gas analysis. Dark respiration rate was measured manometrically. Net carbon accumulated per day and growth analysis of the seedlings were calculated. Initial seed mass of 302921 was 3.5 times larger and final cotyledon area was 2 times larger than those of MO-20, and early seedling growth was better. But, from 3 weeks after emergence until the end of the test period at $25^{\circ}C$, MO-20 showed higher CER per unit leaf area and faster dry weight accumulation than did 302921. Compared with $25^{\circ}C$, growth of MO-20 at $15^{\circ}C$ was suppressed more than that of 302921. Dark respiration rate of MO-20 was slightly higher than that for 302921, but not COz uptake per day for MO-20 was highest at$25^{\circ}C$ and lowest at $25^{\circ}C$. The relative growth rate (RGR) of MO-20 was higher than 302921 at $25^{\circ}C$ due to high net assimilation rate, but there was little difference in RGR between entries at $15^{\circ}C$.}C$.

• KSBB Journal
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• v.14 no.1
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• pp.91-95
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• 1999

The objective of this work was to improve bioluminescence stability of Photobacterium phosphoreum when it stored in view of developing continuous on-line monitoring system for pullutants. Long-term experiments were made to determine the effect of immobilization and storage temperature on the maintenance and stability of bioluminescence from luminescent bacteria. The immobilized cells of P. phosphoreum were compared with free cells in terms of maintenance of bioluminescence at room temperature. The bioluminescence of cells immobilized showed higher bioluminescence intensity that free and strontium bioluminescence stability was investigated with free and immobilized cells stored at $20^{\circ}C,\; 4^{\circ}C,\; -20^{\circ}C\;and\;-70^{\circ}C$for 20 days. Both free and immobilized cells stored at $4^{\circ}C$ emitted a stable bioluminescence while the bioluminescence markedly decreased with those stored at $20^{\circ}C,\;-20^{\circ}C\;and\; -70^{\circ}C$.

• Korean journal of food and cookery science
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• v.28 no.3
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• pp.249-255
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• 2012

The objectives of this study were to evaluate the physicochemical characteristics of puffer fish under storage conditions. Free amino acids were identified in the order of taurine > alanine > lysine > leucine > glutamic acid > valine. Glutamic acid, lysine, histidine, arginine, proline, and aspartic acid increased over time and with increased temperature, and valine and tyrosine were affected by temperature. ATP decreased dramatically during 36 h of storage at $4^{\circ}C$, 24 h of storage at $12^{\circ}C$, and 16 h of storage at $20^{\circ}C$. IMP reached its highest level when puffer fish was stored for 36 h at 4 and $12^{\circ}C$ and 24 h at $20^{\circ}C$, and hypoxanthine levels grew steeply at 60 h at $4^{\circ}C$, 24 h at $12^{\circ}C$ and 20 h at $20^{\circ}C$. In terms of K value, the puffer fish was available for sliced raw fish within 60 h at $4^{\circ}C$, 24 h at $12^{\circ}C$ and 12 h at $20^{\circ}C$, and the fish can be taken in after cooking within 72 h at $4^{\circ}C$ and $12^{\circ}C$ and 36 h at $20^{\circ}C$. The physicochemical quality characteristics showed that puffer fish is available for sliced raw fish within 36 h at $4^{\circ}C$, 16 h at $12^{\circ}C$ and 12 h at $20^{\circ}C$, and that the fish can be taken after cooking within 72 h at $4^{\circ}C$ and $12^{\circ}C$ and 36 h at $20^{\circ}C$.

• Journal of Preventive Medicine and Public Health
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• v.56 no.4
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• pp.312-318
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• 2023

Objectives: We reviewed the operational definitions of colorectal cancer (CRC) from studies using the Korean National Health Insurance Service (NHIS) and compared CRC incidence derived from the commonly used operational definitions in the literature with the statistics reported by the Korea Central Cancer Registry (KCCR). Methods: We searched the MEDLINE and KoreaMed databases to identify studies containing operational definitions of CRC, published until January 15, 2021. All pertinent data concerning the study period, the utilized database, and the outcome variable were extracted. Within the NHIS-National Sample Cohort, age-standardized incidence rates (ASRs) of CRC were calculated for each operational definition found in the literature between 2005 and 2019. These rates were then compared with ASRs from the KCCR. Results: From the 62 eligible studies, 9 operational definitions for CRC were identified. The most commonly used operational definition was "C18-C20" (n=20), followed by "C18-C20 with claim code for treatment" (n=3) and "C18-C20 with V193 (code for registered cancer patients' payment deduction)" (n=3). The ASRs reported using these operational definitions were lower than the ASRs from KCCR, except for "C18-C20 used as the main diagnosis." The smallest difference in ASRs was observed for "C18-C20," followed by "C18-C20 with V193," and "C18-C20 with claim code for hospitalization or code for treatment." Conclusions: In defining CRC patients utilizing the NHIS database, the ASR derived through the operational definition of "C18-C20 as the main diagnosis" was comparable to the ASR from the KCCR. Depending on the study hypothesis, operational definitions using treatment codes may be utilized.

• Journal of the Korean Society of Costume
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• v.51 no.7
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• pp.111-121
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• 2001

The purpose of this study was to investigate the historical changes, and analyze functions and characteristics of western men's underclothes in the second half of the 20C. This study will examine how the social backgrounds influenced on the changes of the functions of men's underclothes and how the changes of outer garments were reflected on underclothes in the second half of the 20C. In the early, the second half of the 20C, underwears of functions was continued to cleanliness and comforts. In the later of the 20C, underwears came to be seen as expressing male sexual power when it became body-conscious. By the changes of outer garments. underclothes changed the same size of proportion. In the late 1960's, the turtleneck type of shirts were copied by outer garments, and we understand that underwear can influence on outer garments. The ruffles of the 18th century reappeared in the 1960's. This reactionism of the late 20C tells us about the relation between social environments and underwear. So the social backgrounds influenced on the formativeness of men's underclothes. We understand that underwear can influence on outer garments and outer garments can influence on underwear, too. The important characteristics of the second half of the 20C were the remarkable resemblance of some styles to those of the Past and the occasional blurring of the distinction between underwear and outerwear.

• Korean journal of food and cookery science
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• v.15 no.6
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• pp.633-638
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• 1999

This study was conducted to investigate the effect of quality preservatives on minimally processed white radish for Kkakttugi, hot radish Kimchi, preparation during storage at $4^{\circ}C$ and $20^{\circ}C$. The firmness of minimally processed white radish decreased during storage at $4^{\circ}C$ and $20^{\circ}C$. However 1% $CaCl_2$ and 2% NaCl+2% sucrose treatments were effective to maintain the firmness of cut radishs. For color, Hunter L values decreased more in the samples stored at $20^{\circ}C$ than at $4^{\circ}C$, while a values showed a slight increase at both storage temperatures. The b values (browning index) showed a notable increase during storage at $4^{\circ}C$ and $20^{\circ}C$. Vitamin C content decreased during storage at both temperatures by 10.4% ~ 95.9%. At both storage temperatures, vitamin C content was highest in the samples treated with 1% NaCl+1% sucrose. For organic acid, while the content of malic acid decreased those of lactic and acetic acid increased during storage.

• Journal of the Korean Society of Food Science and Nutrition
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• v.21 no.1
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• pp.36-42
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• 1992

The lipid compositions of total lipid extracted from the flesh divided into albinic type and melanic type of culture shellfishes, i.e. Achatina fucica Bowdich, Ampullarius insularus were compared. Total lipid contents of shellfishes were $1.11{\sim}3.25%$, the levels were appeared higher in Ampullarius insularus than Achatina fucica Bowdich, and in albinic type than melanic type. It was found that the contents of neutral lipids $(31.79{\sim}40.60%)$ and phospholipids $(50.95{\sim}62.12%)$ were high, while that of glycolipids $(4.84{\sim}9.47%)$ were low. The major fatty acids in total lipid of each sample were $C_{18:2}(11.92{\sim}14.37%)$, $C_{18:1}(12.34{\sim}13.64%)$, $C_{20:4}(11.03{\sim}13.74%)$, $C_{16:0}(7.45{\sim}15.39%)$ and $C_{18:0}(7.34{\sim}11.80%)$ and additionally $C_{20:2}(9.62{\sim}10.19%)$ in Achatina fucica Bowdich, and the major fatty acid composition in total lipids of each sample showed no significant differences between albinic type and melanic type, respectively. Particularly the content of $C_{16:0}$ in total lipids was shown more abundant in Ampullarius insularus and that of $C_{18:0}$, C_{20:2}$ in Achatina fucica Bowdich. The content of polyene acids in total lipids occupied higher level in Achatina fucica Bowdich but $C_{22:6}$ was almost detected, and observed relatively higher amounts in Ampullarius insularus. The main fatty acids in neutral lipid of Achatina fucica Bowdich were $C_{18:2}(16.80{\sim}17.74%)$, $C_{20:2}(12.15{\sim}12.59%)$, $C_{18:1}(9.79{\sim}10.37%)$, $C_{18:0}(7.71{\sim}12.43%)$ and C_{16:0},\;C_{20:4}$ and additionally $C_{18:3} (20.90%)$ was shown predominant in melanic type and the level of polyene acid highest in neutral lipids. The neutral lipids in each type of Ampullarius insularus were mainly composed of $C_{16:0}(16.96{\sim}17.46%)$, $C_{18:1}(13.79{\sim}13.95%)$ and $C_{18:2} (12.90{\sim}15.70%)$ and additionally it chiefly consisted of $C_{18:1}$, $C_{20:4}$and$C_{22:6}$. The major fatty acids in each type of glycolipids were $C_{18:2}(19.01{\sim}19.72)$, $C_{16:0}(12.89{\sim}18.76%)$ and $C_{18:0}(12.68{\sim}17.52%)$ and additionally $C_{18:1}$ in Achatina fucica Bowdich, but $C_{22:1}$ was detected in relatively higher level by 6.95% in albinic type only. The major fatty acids in glycolipids were $C_{18:2}(12.46{\sim}18.21%)$, $C_{16:0}(10.43{\sim}18.48%)$, $C_{20:1}(10.51{\sim}14.59%)$, $C_{20:4}(8.24{\sim}12.34%)$ and additionally it chiefly consisted of $C_{18:0}\;and\;C_{18:1}$ in Ampullarius insularus. The fatty acid composition in phospholipids of each sample was very resembled to total lipids, respectively.