12 results on '"Jun Sik Woo"'
Search Results
2. Effects of heat stress on performance, physiological parameters, and blood profiles of early-fattening Hanwoo steers in climate chambers
- Author
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Jun Sik Woo, Na Kyun Lee, Hong Gu Lee, and Keun Kyu Park
- Subjects
fattening period ,hanwoo steers ,heat stress ,heart rate ,rectal temperature ,temperature humidity index ,Zoology ,QL1-991 - Abstract
Objective This study was conducted to assess effects of heat stress on growth performance, physiological parameters, and blood profiles of Hanwoo steers during early-fattening period in climate chambers. Methods Four Hanwoo steers (body weight, 454.3±10.9 kg; age, 14±0.1 month) were allocated into four levels of temperature-humidity index (THI) in a 4×4 Latin square design for 21 days (pre-adaptation, 7 d; heat stress, 7 d; post-adaptation, 7 d) per period. Experimental treatments were assigned according to THI chart based on National Institute Animal Science (NIAS, 2022): Comfort (25.5°C to 26.5°C, 60%; THI 73 to 75), Mild (28°C to 29°C, 60%; THI 77 to 79), Moderate (29.5°C to 30.5°C, 80%; THI 82 to 84), and Severe (31°C to 32°C, 80%; THI 85 to 86) in separate climatic controlled chambers. Results The dry matter intake (DMI) of the formula feed was lower in Severe compared to Mild and Comfort (p
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- 2024
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3. Prediction of total digestible nutrient and crude protein requirements according to daily weight gain, and behavioral measurements of Hanwoo heifers
- Author
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Ju Ri Kim, Jun Sik Woo, Youl Chang Baek, Sun Sik Jang, and Keun Kyu Park
- Subjects
animal behaviors ,hanwoo ,heifers ,nutrients ,requirements ,Zoology ,QL1-991 - Abstract
Objective This study was conducted to investigate the effects of energy and protein levels in the diet of Hanwoo heifers on growth response and animal behavior. Methods Forty heifers were randomly allocated into three experimental groups according to the target daily weight gain in 8 pens (T-0.2, 2 replications; T-0.4 and −0.6, 3 replications) based on similar body weight (BW) and age in months. The target average daily gain (ADG) was set at 0.2 (T-0.2), 0.4 (T-0.4), and 0.6 kg/d (T-0.6), and feed was based on National Institute of Animal Science (NIAS, 2017). In order to minimize hunger stress of T-0.2 and −0.4, the feeding ratio of rice straw was set to 55%, 50%, and 45% for T-0.2, −0.4 and T-0.6, respectively, so that the dry matter (DM) intake for all treatment groups was uniform but the energy and protein levels in the diet were adjusted differently. A total of 6 items (lying, standing, eating, rumination, walking and drinking) of animal behavior were analyzed. Results During the whole period of the experiment, the ADG of the T-0.2, −0.4 and −0.6 treatments were 0.48, 0.56, and 0.65 kg/d (p
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- 2023
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4. Nutritional value and degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers
- Author
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Keun Hong Song, Jun Sik Woo, Ju Ri Kim, Gyeong Lim Ryu, Youl Chang Baek, Young Kyoon Oh, Wan Sup Kwak, and Keun Kyu Park
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beef cattle ,steer ,performance ,total mixed ration (tmr) ,fruit byproduct ,vegetable byproduct ,Animal culture ,SF1-1100 ,Animal biochemistry ,QP501-801 - Abstract
Objective This study was conducted to evaluate nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers. Methods Nutritional value and in situ degradability of cabbage, Chinese cabbage and fruit-vegetable byproducts were assessed. In vivo feeding trial was also performed for 12 weeks. Thirty-six growing steers were randomly allocated into three groups according to body weight (BW) and age in 12 pens (4 replications/treatment) and assigned to one of the three dietary treatments: control (byproduct 0%), FV-B (fruit-vegetable byproduct 20%), and CA-B (cabbage peel 15% plus Chinese cabbage peel 15%, total byproduct 30%). Results The crude protein contents of cabbage, Chinese cabbage and fruit-vegetable byproducts were 18.69%, 20.20%, and 10.07%, respectively. Concentrations of neutral detergent fiber (NDF) were higher in cabbage (22.31%) and Chinese cabbage (28.83%) than fruit-vegetable (13.94%). Higher concentrations of non-fiber carbohydrate were observed for fruit-vegetable (66.72%) than cabbage (44.93%) and Chinese cabbage byproducts (24.69%). The effective degradability (ED) of both dry matter (DM) and NDF for fruit-vegetable byproduct (DM, 84.69%; NDF, 85.62%) was higher (p
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- 2020
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5. Spatiotemporal Distribution of Dissolved Heavy Metals in Gyeonggi Bay, Korea
- Author
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Jongkyu Park, Hyo Jin Lee, Dongjin Joe, Mansik Choi, Jun-Sik Woo, Kyunggue Park, Dongjun Jang, Sojung Park, and Tae-Ha Kim
- Subjects
0106 biological sciences ,Wet season ,010504 meteorology & atmospheric sciences ,Dissolved silica ,010604 marine biology & hydrobiology ,Seasonality ,Oceanography ,medicine.disease ,01 natural sciences ,Salinity ,Nutrient ,Benthic zone ,Environmental chemistry ,medicine ,Environmental science ,Seawater ,Bay ,0105 earth and related environmental sciences - Abstract
In this study, we investigated the spatial and temporal distribution of heavy metals and nutrients in Gyeonggi Bay, Korea, to determine their present status and seasonal variability, and to identify their sources. Two surveys (May and August 2017) covering the entire Gyeonggi Bay (15 sites) and twelve surveys over four seasons (February, May, August, and November of 2016–2018) covering the Incheon Special Management Area (7 sites) were carried out to collect surface seawaters. Three surveys (January, April, and August of 2015) were also performed to collect seawater samples at Shihwa Lake (16 sites). Although the concentration gradients of nutrient type heavy metals (e.g. copper, nickel, zinc, and cadmium) corresponded to patterns of salinity in both dry and wet seasons, there was little seasonal variability over the three years studied. However, there was evidence that heavy metals were released during mixing with freshwaters in the wet season, likely from river outflow or direct coastal inputs such as effluents from Shihwa Lake. For nutrients, whereas the conservative mixing of dissolved inorganic nitrogen and the release of dissolved inorganic phosphate and dissolved silica were observed in the wet season, the concentrations of organic particles (e.g., chlorophyll-a, particulate organic carbon, and particulate organic nitrogen) had an inverse relationship with salinity in the dry season (May). Scavenged metals (e.g., manganese and cobalt) had non-freshwater coastal sources, such as benthic remobilization from suboxic sediments, and exhibited seasonal variation; they progressively increased in concentration from winter to spring and summer, and dropped to their minimum levels in the fall, which was presumably related to variation in microbial activity in sediments. Based on their relationship with salinity, heavy metals were deduced to be derived from coastal sources such as effluents from Shihwa Lake and freshwater from the Han River.
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- 2020
6. Nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers
- Author
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Jun Sik Woo, Wan Sup Kwak, Gyeong Lim Ryu, Youl Chang Baek, Ju Ri Kim, Young Kyoon Oh, Keun Hong Song, and Keun Kyu Park
- Subjects
Performance ,lcsh:Animal biochemistry ,Total mixed ration ,010501 environmental sciences ,Beef cattle ,Biology ,Body weight ,01 natural sciences ,Feed conversion ratio ,Article ,Ruminant Nutrition and Forage Utilization ,Animal science ,Dry matter ,lcsh:QP501-801 ,0105 earth and related environmental sciences ,lcsh:SF1-1100 ,Fruit Byproduct ,Significant difference ,0402 animal and dairy science ,04 agricultural and veterinary sciences ,040201 dairy & animal science ,Beef Cattle ,Neutral Detergent Fiber ,Total Mixed Ration (TMR) ,Hanwoo ,Vegetable Byproduct ,Animal Science and Zoology ,lcsh:Animal culture ,Steer ,Food Science - Abstract
Objective: This study was conducted to evaluate nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers.Methods: Nutritional value and in situ degradability of cabbage, Chinese cabbage and fruit-vegetable byproducts were assessed. In vivo feeding trial was also performed for 12 weeks. Thirty-six growing steers were randomly allocated into three groups according to body weight (BW) and age in 12 pens (4 replications/treatment) and assigned to one of the three dietary treatments: control (byproduct 0%), FV-B (fruit-vegetable byproduct 20%), and CA-B (cabbage peel 15% plus Chinese cabbage peel 15%, total byproduct 30%).Results: The crude protein contents of cabbage, Chinese cabbage and fruit-vegetable byproducts were 18.69%, 20.20%, and 10.07%, respectively. Concentrations of neutral detergent fiber (NDF) were higher in cabbage (22.31%) and Chinese cabbage (28.83%) than fruit-vegetable (13.94%). Higher concentrations of non-fiber carbohydrate were observed for fruit-vegetable (66.72%) than cabbage (44.93%) and Chinese cabbage byproducts (24.69%). The effective degradability (ED) of both dry matter (DM) and NDF for fruit-vegetable byproduct (DM, 84.69%; NDF, 85.62%) was higher (p
- Published
- 2020
7. Organic Matter in the Sediments of Youngsan River Estuary : Distribution and Sources
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Hyo Jin Lee, Tae-Ha Kim, Hee-Seon J. Choi, and Jun-Sik Woo
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chemistry.chemical_classification ,Total organic carbon ,Dike ,geography ,geography.geographical_feature_category ,Stable isotope ratio ,Sediment ,Estuary ,Nutrient ,chemistry ,Environmental chemistry ,Phytoplankton ,Environmental science ,Organic matter - Abstract
Total organic carbon(TOC), Total nitrogen(TN), and carbon and nitrogen stable isotopes were measured in the sediment and suspended parties in fresh lake water and saline estuarine water to determine the sources of Particulate organic matter(POM) in the sediments of the Youngsan river estuary.POM in the freshwater discharge water was mostly phytoplankton origin with little trace of terrestrial plants. POM from phytoplankton blooms formed in estuarine water in response to the nutrient enriched freshwater discharges was the most important sources of POM in the sediment near the dike, comprising more than 40% of the total organic matter. POM from freshwater phytoplankton and oceanic phytoplankton were also important sources of the sediment POM, and their contributions varied with the distances from the dike. Contribution of freshwater phytoplankton to sediment POM decreased from the dike to the outside of the estuary. Key words : Youngsan River Estuary Sediments, Stable Isotope, Particulate Organic Matter
- Published
- 2014
8. Nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers.
- Author
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Keun Hong Song, Jun Sik Woo, Ju Ri Kim, Gyeong Lim Ryu, Youl Chang Baek, Young Kyoon Oh, Wan Sup Kwak, and Keun Kyu Park
- Subjects
NUTRITIONAL value ,BEEF cattle ,CHINESE cabbage ,BODY weight ,CABBAGE ,VEGETABLE farming - Abstract
Objective: This study was conducted to evaluate nutritional value and in situ degradability of fruit-vegetable byproducts and their feeding effects on performance of growing Hanwoo steers. Methods: Nutritional value and in situ degradability of cabbage, Chinese cabbage and fruitvegetable byproducts were assessed. In vivo feeding trial was also performed for 12 weeks. Thirty-six growing steers were randomly allocated into three groups according to body weight (BW) and age in 12 pens (4 replications/treatment) and assigned to one of the three dietary treatments: control (byproduct 0%), FV-B (fruit-vegetable byproduct 20%), and CA-B (cabbage peel 15% plus Chinese cabbage peel 15%, total byproduct 30%). Results: The crude protein contents of cabbage, Chinese cabbage and fruit-vegetable byproducts were 18.69%, 20.20%, and 10.07%, respectively. Concentrations of neutral detergent fiber (NDF) were higher in cabbage (22.31%) and Chinese cabbage (28.83%) than fruit-vegetable (13.94%). Higher concentrations of non-fiber carbohydrate were observed for fruit-vegetable (66.72%) than cabbage (44.93%) and Chinese cabbage byproducts (24.69%). The effective degradability (ED) of both dry matter (DM) and NDF for fruitvegetable byproduct (DM, 84.69%; NDF, 85.62%) was higher (p<0.05) than cabbage (DM, 68.47%; NDF, 55.97%) and Chinese cabbage byproducts (DM, 68.09%; NDF, 54.22%). The DM intake was not different among treatments because the amount of feed was kept constant according to the BW of growing steers to prevent overweight during the growing period. The average daily gain during the whole experimental period was not different among treatments (1.26, 1.25, and 1.34 kg/d for control, FV-B, and CA-B). The ED of both DM and NDF degradability of the total mixed ration (TMR) diets were very similar among treatments. Feed conversion ratio during the whole period showed no significant difference among treatments. Conclusion: This study demonstrates that fruit-vegetable and cabbage byproducts up to 20% and 30% (as fed basis), respectively can be included in TMR diets for growing beef cattle. [ABSTRACT FROM AUTHOR]
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- 2020
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9. Estimation of Nitrogen Mass Balance in Sihwa-ho Watershed, 2010
- Author
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Jung-Kil, Choi, primary, Hyo-Jin, Lee, additional, Tea-ha, Kim, additional, Jea-hun, Choi, additional, Jun-Sik, Woo, additional, and Kang-Wung, Lee, additional
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- 2018
- Full Text
- View/download PDF
10. Heavy Metal Contamination in Sediments by Herbei Sprit Oil Spill
- Author
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Man Sik Choi, Won Joon Sim, Jun Sik Woo, and Yun Ho Song
- Subjects
Pollutant ,Total organic carbon ,Metal contamination ,chemistry ,Environmental chemistry ,Oil spill ,Environmental engineering ,Environmental science ,chemistry.chemical_element ,Intertidal zone ,Heavy metals ,Contamination ,Sulfur - Abstract
Since crude oil contains various pollutants including heavy metals, the environmental impact should be assessed for heavy metals as well as oil itself. In order to estimate the extent of heavy metal contamination, surface sediments were collected at the intertidal and coastal zone around the Herbei sprit oil spill area during December 2007 and January 2008. Organic carbon, sulfur and heavy metals were determined to assess heavy metal contamination in sediments. The crude oils contained C, S, V and Ni, but little toxic metals such as As, Cd, etc. From organic carbon content, the highest contaminated site was estimated that oils contributed to sediments up to 10%, and this site showed high V concentration. Potentially contaminated sediments by crude oil could be differentiated from unaffected sediments through V/Al and Ni/Al ratios, which can be used as indicators of oil contamination even after the oils were fully degraded.
- Published
- 2013
11. Asymmetric Synthesis ofβ-Amino-α-Hydroxy Acids through Lewis Acid-Mediated Addition of Ketene Acetal to Imines
- Author
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Gwan Sun Lee, Young-Gil Ahn, Jun-Sik Woo, Won Koo Lee, and Hyun-Joon Ha
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chemistry.chemical_classification ,Aldimine ,Hydrolysis ,chemistry.chemical_compound ,chemistry ,Hydrogenolysis ,Stereochemistry ,Acetal ,Enantioselective synthesis ,Ketene ,General Chemistry ,Lewis acids and bases ,Demethylation - Abstract
Asymmetric synthesis of β-amino-α-hydroxy acids, key components of medicinally important molecules including Paclitaxel, KRI-1314, amastatin, and microginin, has been attained from the aldimine coupling of chiral imines N-alkylidene-(S)- or (R)-α-methylbenzylamine with (Z)-α-methoxyketene methyltrimethylsilyl acetal, followed by demethylation, hydrogenolysis, and hydrolysis.
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- 2001
12. ChemInform Abstract: Lewis Acid Induced Synthetic Equivalents of Imines and Iminium Ions. Part 14. Asymmetric Synthesis of β-Amino-α-hydroxy Acids Through Lewis Acid Mediated Addition of Ketene Acetal to Imines
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Won Koo Lee, Young-Gil Ahn, Hyun-Joon Ha, Jun-Sik Woo, and Gwan Sun Lee
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chemistry.chemical_compound ,Equivalent ,chemistry ,Acetal ,Enantioselective synthesis ,Ketene ,Iminium ,Organic chemistry ,General Medicine ,Lewis acids and bases ,Ion - Published
- 2010
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