• Korean Journal of Fisheries and Aquatic Sciences
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• v.11 no.4
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• pp.243-247
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• 1978

COD and sulphide contents in the superficial mud in three oyster farms, one near Gajo-do in Chinhae Bay, the second near Eup-do in Koseong Bay and the third near Eogu in Keoje Bay, around the Chungmu area have been monthly determined for seven months from May through November in 1978. Bottom water was also checked for chlorophyll-a, dissolved oxygen, COD and sulphide. In general, large amounts of COD and sulphide in the superficial mud were found in the summer season, COD was 38.1 mg/g dry mud in the farm near Gajo-do, 32.3 mg/g near Eup-do and 25.1 mg/g in Eogu farm and sulphide was 0.313 mg/g dry mud, 0.517 mg/g and 0.132 mg/g respectively. COD and sulphide contents in the farms near Gajo-do and Eup-do were a little over the upper level of the eutrophic range, that is, 30 mg/g dry mud in COD and 0.3 mg/g dry mud in sulphide. It shows that the above two oyster farms were already eutrophicated. However, among three oyster farms no clear difference in bottom water was found.

• Journal of Ginseng Research
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• v.28 no.3
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• pp.132-135
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• 2004

This study was performed to investigate the anxiolytic effects of total sponin fraction from Ginseng Radix Rubra (KRG) in mice using the elevated plus-maze model. The water extract of KRG and ginseng total saponins (GTS) purified from the water extract of KRG were administered orally to mice. One hour after administration of KRG water extract and GTS, mice were tested on the elevated plus-maze. The water extract of KRG 100 mg/kg, and GTS 25 and 50 mg/kg did not increase open arm entries and time spent on open arm. However, GTS 100 mg/kg increased the number of open arm entries and time spent on open arm. On the other hand, as the plus-maze test was affected by changes in locomotor activity, an additional test was carried out with the specific aim of monitoring locomotor activity. The water extract of KRG 100 mg/kg, and GTS 25 and 50 mg/kg did not affect the locomotor activity. However, GTS 100 mg/kg significantly decreased locomotor activity. From this study, we suggest that GTS may play an imponant role on the anxiolytic effects in the plus-maze model.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.132-132
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• 2018

The aim of this study was to enhance the Tartary buckwheat growth and phenolic profile by the application of $SiO_2$ on potsin the glasshouse. The liquid of $SiO_2$ were applied at three times after three weeks of sowing at ten days interval. The doses of the $SiO_2$ was low (2.5 ml/5 L water), high (10 ml in 5 L water) and control experiment was done without $SiO_2$. In this study, it is clearly shown that high dose of $SiO_2$ increased the buckwheat plant growth including, plant height, leaf length and width, stem diameter, fresh weight and number of seed per plant compared to control treatment. In the same way, the total phenolic compound (1421 mg/100 g), total flavonoid (35.1 mg/100g), rutin (3,130 mg/100g) and DPPH (82%) in plant were also increased high dose of $SiO_2$ compared to control (1,175 mg/100g, 31.9mg/100g, 860 mg/100g, 59%, respectively). Moreover, higher phenolic compound (1,421 mg/100g) and DPPH (82%) was observed in plant compared to seed (196 mg/100mg, 72 %, respectively). In the contrary, total flavonoid (36.2 mg/100g) and rutin (1,400 mg/100g) was higher in buckwheat seed compared to plant (35.1 mg/100g, 3,130 mg/100g, respectively). Finally, it is concluded that higher dose of $SiO_2$ enhance buckwheat growth and phenolic profile. Further investigation is needed to evaluate the optimum dose of $SiO_2$ according to soil conditions in the field.

• Animal Bioscience
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• v.34 no.10
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• pp.1643-1652
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• 2021

Objective: Two experiments were conducted to provide a new approach for evaluating feed nutritional value by metabolizable glucose (MG) in piglet diets with different levels of starch and crude fiber. In Exp 1, a regression equation for MG was generated. In Exp 2, the equation was verified, and the optimal growth performance of piglets under appropriate MG levels was tested. Methods: In Exp 1, 20 weaned piglets (7.74±0.81 kg body weight [BW]) were randomly assigned to 1 of 4 treatments, including the basal diet containing different levels of MG (starch, 25.80%, 31.67%, 45.71%, 49.36%; crude fiber, 1.23%, 1.35%, 1.80%, 1.51%). The piglets were implanted with an ileal fistula, cannulation of the carotid artery, portal vein, and mesenteric artery. The chyme from the ileum fistula and blood samples were collected. In Exp 2, 30 weaned piglets (8.96±0.50 kg BW) were randomly assigned to 1 of 5 treatments, including the experimental diets with different levels of MG (37.6, 132.5, 300.0, 354.3, and 412.5 g/kg). The piglets' BW, and feed consumption were recorded to calculate growth performance during the 28-d experiment. Results: In Exp 1, the MG levels in 4 diets were 239.62, 280.68, 400.79, and 454.35 g/kg. The regression equation for the MG levels and dietary nutrients was: Y (MG) = 12.13×X₁ (starch)+23.18×X₂ (crude fiber)-196.44 (R² = 0.9989, p = 0.033). In Exp 2, treatments with 132.5 and 300.0 g/kg MG significantly (p<0.05) increased average daily gain and feed conversion efficiency of weaned piglets, increased digestibility of crude fat, and had no effect on digestibility of crude protein compared to 300.0 to 412.5 g/kg MG. Conclusion: The pig model combining the ileum fistula and cannulation of blood vessels was successfully used to determine the dietary MG levels. The recommended MG level in weaned pig diets is 132.5 to 300.0 g/kg.

• 한국전자현미경학회:학술대회논문집
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• 2004.11a
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• pp.129-132
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• 2004

• Proceedings of the Korean Magnestics Society Conference
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• 2015.05a
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• pp.132-133
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• 2015

• Korean Journal of Materials Research
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• v.32 no.3
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• pp.132-138
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• 2022

Zintl phase Mg₃Sb₂ is a promising thermoelectric material in medium to high temperature range due to its low band gap energy and characteristic electron-crystal phonon-glass behavior. P-type Mg₃Sb₂ has conventionally exhibited lower thermoelectric properties compared to its n-type counterparts, which have poor electrical conductivity. To address these problems, a small amount of Sn doping was considered in this alloy system. P-type Mg₃Sb₂ was synthesized by controlled melting, pulverizing, and subsequent vacuum hot pressing (VHP) method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate phases and microstructure development during the process. Single phase Mg₃Sb₂ was successfully formed when 16 at.% of Mg was excessively added to the system. Nominal compositions of Mg_3.8Sb_2-xSn_x (0 ≤ x ≤ 0.008) were considered in this study. Thermoelectric properties were evaluated in terms of Seebeck coefficient, electrical conductivity, and thermal conductivity. A peak ZT value ≈ 0.32 was found for the specimen Mg_3.8Sb_1.994Sn_0.006 at 873 K, showing an improved ZT value compared to intrinsic one. Transport properties were also evaluated and discussed.

• Korean Journal of Food Science and Technology
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• v.31 no.1
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• pp.115-121
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• 1999

Changes of free sugars, lipoxygenase activity and effects of chitosan treatment were analyzed during cultivation of soybean sprout. Free sugars(sucrose, raffinose and stachyose) were more rapidly decomposed in the cotyledon of soybean sprout. Contents of sucrose and raffinose in control group were decreased more rapidly than those of chitosan treated soybean sprouts (CTSS). But the decreasing rate of stachyose was higher in the CTSS. In the hypocotyl, 82% of L-2/3 activity were decreased, whereas 42% of the activity were decreased in the cotyledon after 132 hours of germination. The effect of chitosan treatment on the lipoxygenase activity was more effective on L-2/3 isozyme than L-1. After the germination period of 132 hours, L-2/3 activity of control group was 82.7unit/mg and that of CTSS was 56unit/mg.

• Proceedings of the Korean Magnestics Society Conference
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• 2012.11a
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• pp.132-132
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• 2012

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.132-132
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• 2006