• Journal of Veterinary Clinics
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• v.32 no.5
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• pp.426-432
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• 2015

This study compared blood metabolites during peri- and postpartum periods among cows with clinical or subclinical endometritis and cows without endometritis. Blood samples from 207 Holstein dairy cows were collected at 4 weeks prepartum, just after calving, and at 1, 2, 4, and 6 weeks postpartum to measure serum concentrations of calcium, magnesium, non-esterified fatty acids (NEFAs), total cholesterol, albumin, urea nitrogen, ${\beta}$-hydroxybutyrate (BHBA), aspartate aminotransferase (AST), ${\gamma}$-glutamyltransferase, glucose, and phosphorus. Clinical endometritis was diagnosed by the observation of vaginal discharge (> 50% pus) and subclinical endometritis was diagnosed by the evaluation of uterine cytology (> 18% neutrophils) at 4 weeks postpartum. Cows were divided into three groups based on the presence or absence of clinical or subclinical endometritis: the control group (n = 104), the clinical endometritis group (n = 66), and the subclinical endometritis group (n = 37). Calcium and magnesium concentrations were lower in the clinical endometritis group than in the control and subclinical endometritis groups throughout the study period (p < 0.05 to 0.0001), whereas the NEFAs concentration was higher in the clinical endometritis group than in the control group throughout the study period (p < 0.01). The total cholesterol concentration was lower in the clinical endometritis group than in the control and subclinical endometritis groups throughout the pre- and postpartum periods (p < 0.05 to 0.001). The albumin concentration was lower in the clinical endometritis group than in the control and subclinical endometritis groups during the postpartum period (p < 0.05 to 0.001). The urea nitrogen concentration was lower in the clinical endometritis group than in the control and subclinical endometritis groups at 4 and 6 weeks postpartum (p < 0.01). At 1 week postpartum, the BHBA concentration was higher in the clinical endometritis group than in the control group (p < 0.05), whereas the AST concentration was higher in the clinical endometritis and subclinical endometritis groups than in the control group (p < 0.05). In conclusion, lower serum concentrations of calcium, magnesium, total cholesterol, albumin, and urea nitrogen, but higher concentrations of NEFAs, BHBA, and AST during the postpartum period were associated with the incidence of clinical endometritis, indicating the importance of balanced nutrition during the transition period.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.6
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• pp.999-1004
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• 2002

In this study, pork loin was cured for 20 days in the 2$^{\circ}C$ curing solution with the salt concentration of 3, 5, 7 and 9% respectively, and the effects of salt concentration and curing time on myofibrillar protein extractability (MPE), myofibrillar fragmentation index (MFI), water holding capacity (WHC), salt content, and palatability of pork loin were investigated. The pork loin cured in the 3, 5 and 7% curing solution showed the increased level of MPE and WHC up to 20 days of curing time, and the increased level of MFI up to 16 days of curing time. Also those values increased with the increasing salt concentration, regardless of the curing time. The pork loin cured in the 9% curing solution did not show any consistency in the results. The boiled cured pork loin showed better color up to 16 days of curing time, as the salt concentration of curing solution increased. The color of pork loin cured in the 3% curing solution was not uniform. The pork loin cured in the 9% curing solution showed good color, but its flavor and palatability were unacceptable. The palatability of pork loin could be improved significantly by curing it in the 5% curing solution for 16 days, and in the 7% curing solution for 12 days.

• Korean Journal of Ecology and Environment
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• v.36 no.2 s.103
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• pp.181-190
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• 2003

An investigation was conducted on the aquatic environment of the Okchon Stream watershed six times from May to September 2002. The results of investigation revealed that variation of environmental factors were quite significant for each stream and reach, showing a significant difference between running water and stagnant water. Aquatic nutrients were relatively low in the upstream, gradually increasing as the influx of treated wastewater into the stream increased. This suggests that the point source definitely affected the nutrient content of the stream. In particular, the variations of SRP and $NH_4$ were very distinct in the watershed compared to other nutrients. Thus, it can be considered as a major factor in evaluating the effect of treated wastewater. Immediately after the influx of treated waste-water, the average content of SRP rose to 919.3 ${\mu}g$ P/l. This was a very effective level in the watershed, suggesting that the percentage of the nutrients in the water was controlled by the content of P. The constant supply of treated wastewater was found to be a critical factor in triggering the increase in chl-a in the embayment of the stream. With the proliferation of the blue-green algae, the content of chl- a ranged 234.5${\sim}$1,692.2 ${\mu}g/l$. The maximum standing crops exceeded $1.0{\times}10^6$ cells/ml in August, which was more than 200 times the level for red tide in the freshwater. This result was well reflected in other environmental factors, with 100% of AFDM/TSS reflecting the severity of water pollution by algae. Therefore, the reduction of P and N con-tents in the treated wastewater is critical in improving the aquatic environment of the stream as well as water quality management for the reservoir.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.04a
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• pp.117.1-117
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• 2003

새송이 버섯은 맛과 향이 좋고 영양적으로 우수하여 성인병 예방과 개선 효과가 있다고 알려져 있으나 재배농가의 급증으로 인한 가격하락과 집중출하로 신선도의 하락 등이 문제가 되고 있어 새송이 버섯의 활용성을 향상시키고, 소비자의 기호를 충족시킬 수 있는 버섯류 가공품 개발이 요구되고 있다. 전통절임식품을 응용한 새로운 버섯류 장류절임 가공법을 개발하기 위하여 절임 전 처리에 따른 품질특성을 비교하였으며, 이를 위하여 먼저 절임 전처리 조건으로 블랜칭처리, 적정 염농도와 처리시간 및 탈염법을 개발하고 건조 등의 전처리에 따른 품질 평가는 수분함량, 염도, 색상, 조직감, 관능특성 등을 평가하였다. 새송이 버섯을 전처리하기 위한 블랜칭 처리조건은 7$0^{\circ}C$에서 10분간 처리한 구가 조직감이 우수하고 갈변이 적었으며 염 침지시간은 침지 72시간까지는 증가하였으나 그 이후로는 증가하지 않았고 4$0^{\circ}C$에서 탈염하는 것이 가장 우수하여 전처리 조건으로 선정하였다. 전처리 방법에 따른 중량변화는 블랜칭 처리가 약 10% 정도 중량이 더 많았으며 이 영향은 건조 후에도 지속되었다. 수분함량도 블랜칭 처리가 높았으며 염도 또한 건조 처리에 따라 높은 함량을 보였으나 블랜칭 처리를 병행했을 경우 낮은 값을 나타내었다. 조직의 강도는 무처리에 비하여 전처리를 함에 따라 많은 힘이 소요되어 질긴 조직 특성을 나타냄을 알 수 있다. 관능평가 결과 블랜칭 처리를 단독으로 실시한 B(B)처리구가 관능적 특성치 모두 높은 값을 보여 전처리 방법으로는 가장 우수한 전처리 방법임을 알 수 있었다.저온 장시간 처리한 경우에 비하여 낮은 수준이지만 약간의 증감 경향을 보이다가 고른 평형 상태를 유지하였다. 산소 농도는 저온 장시간 처리 직후 급격히 저하된 후 다시 증가하였으며 저장 7일 후에는 4$0^{\circ}C$ 3시간 처리구를 제외하고는 평형 상태를 유지하였다. 고온 단시간 처리구의 경우 처리 직후부터 저장 7일 후까지 고른 평형 상태를 유지하였다. 에틸렌의 경우 저온 장시간 처리구는 처리 직후 그 농도가 급격히 상승하였다가 저장 1일 후부터 대조구보다 낮은 값을 나타내었다. 고온 단시간 처리구의 경우 저온 장시간 처리구와는 달리 저장 1일 후부터 그 농도가 다소 상승되었다가 다시 감소는 경향을 보였다. 한편 열처리하여 냉각시킨 직후 및 저장1주 후 사과의 pH, 산도, 당도, 경도, 과육의 갈변도 등을 조사하였던 바 대조구 및 처리구간에 일부 항목에 있어서는 약간의 차이를 나타내었다. 대치할 수 있을 것이라고 사료된다. 수분함량은 기계적 검사보다 관능검사와 더욱 높은 상관관계를 나타냈다.내었다. 항균활성이 우수한 생약재를 농도별로 활성을 조사한 결과, 물 추출물과 10% Ethanol 추출물 모두 낮은 농도에서도 우수한 항균활성을 나타내었다.취와 함께 점질성 갈변물질이 생성되었다. 이와 같은 결과로 볼 때, BAAG의 처리는 BAAC의 경우보다 가격은 저렴하면서도 항균력은 우수한 천연 항균복합제재로써 농산물 식품원료에 적용하여 선도유지 기간을 연장할 수 있는 효과를 기대할 수 있었다. 과일 등의 포장제로서 이용할 가능성을 확인하였다.로 [-wh] 겹의문사는 복수 의미를 지닐 수 없 다. 그러면 단수 의미는 어떻

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.8 no.2
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• pp.151-163
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• 2003

In this study, we investigated the physiochemical characteristics of temporal estuarine environment formed during the summer flood season (consecutive rainy days with average 50 mm day$^{-1}$ precipitation) in the coastal area of South Sea of Korea. The freshwater from the Seomjin River was characterized by lower temperature, salinity and pH, and high concentrations of COD and nutrients. In the summer flood season, such peculiar Somejin-River freshwater was dispersed southward along the coast of Yeosubando-Dolsando-Geumodo, form-ing temporal estuarine environment (defined as "Coastal Pseudo-Estuary" in this study) throughout the entire study area (as far as 60 km from the Seomjin River mouth). Compared to the winter dry season, the DIN/DIP ratio was almost doubled (16-36) during the summer flood season. This excessive nitrate supply during the summer flood season was probably due to nitrogenous fertilizer. Distribution and behaviors of physiochemical factors in this coastal pseudo-estuarine environment were controlled not only by the runoff of the Seomjun River (physical mixing of river water with seawater) but also by the biogeochemical estuarine processes which are mostly similar to those of the river estuary.r estuary.

• Journal of the Korean Society for Marine Environment & Energy
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• v.18 no.3
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• pp.189-206
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• 2015

The present study was conducted to investigate the oceanic characteristics of the northern East China Sea through identification of long-term variation patterns of oceanic environment factors, for the objective of gaining understanding of oceanic environment characteristics of the northern waters of East China Sea, which closely influence the oceanic environments of waters nearby South Korea. The study methodology included the use of oceanographic data (water temperature, salinity, dissolved oxygen, nutrients, and chlorophyll-a) on the northern East China Sea from the Korea Oceanographic Data Center (KODC), collected by season for 20 years between 1995 and 2014. Moreover, for the study on the distribution of nutrients, chlorophyll-a. The main water masses that affected the northern East China Sea during the study period were classified as Changjiang diluted water (CDW), Tiawan current warm water (TCWW), Yellow Sea cold water (YSCW), and Kuroshio source water (KW). The forces of CDW and TCWW that forms on the surface and sub-surface layers had weakened for 20 years and the force of KW that forms on the intermediate layer showed a distinctively decreasing trend. However, YSCW showed a trend of expanding its force. Phosphate and silicate exhibited a decreasing tendency and phosphate showed a pattern of being depleted on the surface layer after 2009. It is determined that one of the reasons for this is the concentration of nutrients introduced through CDW and TCWW being too low. The concentration of chlorophyll-a exhibited an increasing tendency during the study period, the reasons for which are determined to be the influences of increase in water temperature, supply of nutrients via YSCW, and increases in light transmission from decrease in suspended solid due to the construction of the Three Gorges Dam.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.6 no.3
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• pp.201-210
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• 2001

Salinity, DIN, DIP, DIN/DIP and indigenous algal assay were determined to estimate the limiting nutrient for phytoplankton growth in Gwangyang Bay, South Sea of Korea. Seawater samples were collected at surface and bot-tom water in 4 November 1999 (dry season) and 2 September 2000 (after heavy rain). In 4 November 1999, the salinity, DIN, DIP and DIN/DIP were 29.92 psu, 13.59 ${\mu}M$, 3.41 ${\mu}M$ and 4.14 respectively. In 2 September 2000, These values were 24.62 psu, 27.77 ${\mu}M$, 2.82 ${\mu}M$ and 9.79 respectively. The DIN and DIP concentrations in this study were higher than Deukryang, Yeoja and Gamak Bay, South Sea of Korea. Especially, DIP concentration was 8 times high compared to Deutryang, Yeoja and Gamak Bay. The main sources of nitrogen seem to be freshwater runoff from Somjin River and industrial wastewater. But, the main sources of phosphorus seem to be industrial wastewater around Gwangyang Bay. The limiting nutrient was nitrogen at all station in 4 November 1999. The limiting nutrient was also nitrogen in 2 September 2000 in spite of heavy rain observed because of relatively much volume of phosphorus sup-plied from point sources than nitrogen. In case of below 20 psu in salinity by heavy rain, the limiting nutrient willbe shift from nitrogen to phosphorus at some area of Somjin River estuary. But the limiting nutrient will be never shift to phosphorus throughout Gwangyang Bay, eastern coast of Yeoja and Dolsan because of much volume of phosphorus runoff from point source in coastal area of Gwangyang Bay.

• Journal of the Korean Society for Marine Environment & Energy
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• v.3 no.4
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• pp.65-75
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• 2000

The roles of environmental factors affecting on heterotrophic bacterial distribution at Hangam Bay and Masan Bay in which occurred frequently red tide, during June to November 1996 were investigated. The aquatic environment of Masan Bay and Haengam Bay showed difference in the contents of inorganic nutrients. Haengam Bay may be defined as nitrogen limited aquatic environment. On the other hand, Masan Bay appeared to the appropriate N/P molar ratio of mean 15.9 during the periods of study. By the results of simple regression, chlorophyll a showed significant correlation with precipitation (r=0.813, P<0.05) and phosphorus (r=0.846, P<0.05) at Haengam Bay, but not showed significant correlation with parameters at Masan Bay. The heterotrophic bacteria showed significant correlation with many environmental parameters at Masan Bay (Precipitation, r=0.990, P<0.01 : NO₃-N, r=0.901, P<0.05 : Dissolved inorganic nitrogen, r=0.899, P<0.05 ; N/P molar ratio, r=0.952, P<0.05 : Salinity, r: -0.934, P<0.05) than Haengam Bay (SiO₃-Si, r=0.960, P<0.01). By the results of multiple regression, the chlorophyll a was varied with only 2 factors in Masan Bay (R²=0.100) and 3 factor in Haengam Bay (R²=0.903). The major factor which affected to chlorophyll a was SiO₃-Si (R²%=67.8) in Masan Bay, and -N/P (R²%=37.6) in Haengam Bay. The heterotrophic bacteria were varied with 4 factors in Masan Bay (R²=100) and 2 factor in Haengam Bay (R²%=0.878). The major factor, which affected to heterotrophic bacteria, was SiO₃-Si (R²%=42.3) and salinity (R²%=32.1) in Masan Bay, and SiO₃-Si (R²%=76.3) in Haengam Bay. Resultingly, the influx of freshwater in Masan and Haengam Bay was enriched in inorganic nutrients, and plays an important role in the change of heteroterophic bacteria and chlorophyll a during early summer to autumn.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.1
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• pp.25-31
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• 2001

Characteristics (salt concentration, weight loss, soluble solid content, moisture content, pH, textural properties) of kakdugi radish cube (kakdugi radish, $2{\times}2{\times}2\;cm$) were evaluated during salting. Five different radish cultivars harvested in autumn were immersed into 10, 15 or 20% brine solution (radish : brine solution = 1 : 2) at $15^{\circ}C$ for 5hrs. The time required to reach the optimum salt concentration (3.0%) was different among cultivars; in the 10% brine solution, 5hr for 'Taeback', 4hr for 'Bakja', 3hr for 'Kwandong' and 'Bakbong', 2hr for 'Bagkwang'. Generally, it was observed that it took shorter salting time at higher concentration of brine solution. While the highest value of weight loss of kakdugi radish cubes was observed with 'Bagkwang', the lowest, 'Taeback'. There was a decrease of pH of kakdugi radish during salting; while 'Bakja' showes little change in pH, 'Bagkwang' shows large decrease of pH. Hardness and fracturability decreased during salting; the highest value of hardness was observed with 'Taeback', the lowest, 'Bagkwang' has the highest moisture content, the lowest soluble solid content and hardness. There was a similarity of characteristics of kakdugi radish cube between two cultivars, 'Taeback' and 'Bakja', as well as 'Bagkwang', and those of 'Kwandong' and 'Bakbong' were between two types of cultivars.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.5
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• pp.819-825
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• 2001

Characteristics (salt concentration, weight loss, soluble solid content, moisture content, pH, textural properties) of kakdugi radish cube (2$\times$2$\times$2 cm) were evaluated during salting. Four different radish cultivars harvested in spring were immersed into 5, 10 or 15% brine (radish : brine - 1 : 2) at 15$^{\circ}C$ for 5 hr. The time required to reach the optimum salt concentration (3.0%) was different among cultivars; in 10% brine solution, 5 hr for ‘Bakbong’and ‘9621’, and 4 hr ‘Bagkwang’ and ‘Housebommu’, in 15% brine, 3 hr for ‘Bakbong’and ‘9621’, and 2 hr for ‘Bagkwang’and ‘Housebommu’. While the highest value of weight loss of kakdugi radish cube was observed with ‘Bagkwang’, the lowest, ‘Bakbong’. There was a decrease of pH of kakdugi radish during salting ; while ‘Bakbong’ showed little change in pH, ‘Bakbong’and ‘Housebommu’ showed large decrease of pH. Hardness and fracturability decreased during salting; the highest value of hardness was observed with ‘Bagkwang’, the lowest, ‘Bagkwang’. ‘Bakbong’ has the lowest moisture content, but the highest soluble solid content, while ‘Bagkwang’and ‘Housebommu’ have the highest moisture content, but the lowest soluble solid content. There was a similarity of characteristics of kakdugi radish cube between two cultivars, ‘Bagkwang’and ‘Housebommu’.