BACKGROUND: Constructed wetlands for wastewater treatment are vegetated by wetland plants. Wetland plants are an important component of wetlands, and the plants have several roles in relation to the livestock wastewater treatment processes. The objectives of this study were to investigate the growth characteristics and nutrient absorption of water plants in constructed wetlands for treating livestock wastewater. METHODS AND RESULTS: In this study, livestock wastewater treatment plant by constructed wetlands consisted of $1^{st}$ water plant filtration bed, $2^{nd}$ activated sludge bed, $3^{rd}$ vertical flow(VF), $4^{th}$ horizontal flow(HF) and $5^{th}$ HF beds. Phragmites communis TRINIUS(PHRCO) was transplanted in $3^{rd}$ VF bed, Iris pseudoacorus L(IRIPS) was transplanted in $4^{th}$ HF bed and PHRCO, IRIPS and Typha orientalis PRESEL(THYOR) were transplanted in $5^{th}$ HF. Growth of water plants in constructed wetlands were the highest in October. The IRIPS growth was higher than other plant as 264 g/plant in October. The absorption of nitrogen and phosphorus by IRIS were 3.38 g/plant and 0.634 g/plant, respectively. The absorption of K, Ca, Mg, Na, Fe, Mn, Cu and Zn by water plants were higher in the order of IRIPS > THYOR > PHRCO. CONCLUSION(S): The absorption of nutrients by water plants were higher on the order of IRIPS > THYOR > PHRCO in constructed wetlands for treating livestock wastewater.
The aim of this study was to evaluate the quality characteristics and antioxidant activity of yogurt containing spirulina. Yogurt base was prepared from skim milk added with $0.25{\sim}1%(w/v)$ spirulina powder and fermented with lactic acid bacteria (S. thermophilus : L. bulgaricus = 1 : 1) at $40^{\circ}C$ for 12 hr. Kiwi puree and oligosaccharides were then added. The addition of 1% spirulina powder stimulated the growth of lactic acid bacteria, which showed the highest viable cell count ($3.4{\times}10^9$ CFU/mL), and increased the titratable acidity (1.10%). The viscosity range of the yogurt was 6,000 to 9,000 cP, and the sugar content of the yogurt was around 18 $^{\circ}Brix$. The antioxidant activities were determined using the DPPH method, and the hydroxyl radical scavenging activity of the yogurt containing spirulina was higher than that of the control. The sensory evaluation scores for appearance, odor, taste, overall acceptability and buying intention were higher in the yogurt containing 0.25% spirulina than in the other groups. The amount of macronutrients in the yogurt containing spirulina was higher than that in the control. In addition, the amounts of micronutrients in the yogurt containing spirulina was significantly increased. According to these results, the optimum concentration of spirulina powder is around 0.25%.
Journal of the Korean Society of Food Science and Nutrition
/
v.34
no.7
/
pp.1008-1017
/
2005
The purpose of this study was to evaluate the Quantity and Quality of food and nutrient intake of preschool children. The subjects were 57 children aged 3 to 6 years in Gumi day-care centers. Total daily dietary intakes were calculated by weighing food consumed at the day-care centers taken together with dietary records by children's mothers for intakes at home. This survey was conducted during 3 days including week and weekend days. Diet Quality was assessed by NAR (Nutrient Adequacy Ratio), MAR (Mean Adequacy Ratio), food group pattern and DDS (Dietary Diversity Score). The daily food intake was 992.7g, the plant food intake $(68\%)$ was higher than animal food intake $(32\%)$. The daily energy intake was 1249.2 kcal $(85\%\;RDA)$ and protein 43.8g $(153.6\%\;RDA)$. Percentage of calcium, iron, and niacin consumed below $75\%$ of RDAs were $29.8\%,\;35.1\%\;and\;28.1\%$, respectively. Proportions of energy from carbohydrate, protein and fat were $61.0\%,\;14.1\%\;and\;25.5\%$, respectively. Calorie intake proportion of breakfast, lunch, dinner and snack were $15\%,\;20\%,\;19\%\;and\;46\%$, respectively. The NAR of Ca and Fe and MAR were 0.84, 0.85 and 0.92, respectively. Thirty-one point six percent of children consumed 5 food groups (GMFVDS=110111) per day. Persons who had higher DDSs correlated positively with NAR and MAR. As a result, dietary intake of preschool children partially showed a problem of over and under nutrition in Quantity or Quality. We hope that the result of this study could be helpful for developing the nutrition education program for the health and nutrition of preschool children.
Journal of the Korean Society of Food Science and Nutrition
/
v.41
no.4
/
pp.550-560
/
2012
This study was performed to investigate the physicochemical properties of sea urchin ($Anthocidaris$$crassispina$, $Pseudocentrotus$$depressus$, $Hernicentrotus$$pulcherrimus$) roe as a processed or canned food by steaming treatment. Proximate compositions of $A.$$crassispina$ roe and $P.$$depressus$ roe were similar, but water, crude ash, and carbohydrate contents of $H.$$pulcherrimus$ roe showed little differences. Proximate compositions of sea urchin roe showed slight differences with steaming time, raw samples showed no differences. Glycine content of the three raw sea urchin roe samples showed the highest concentration among free amino acids, followed by arginine, alanine, and lysine, in order. Total free amino acid contents of raw sea urchin roe were 754.70 mg% ($A.$$crassispina$), 567.75 mg% ($P.$$depressus$), and 449.44 mg% ($H.$$pulcherrimus$). Total free amino acid content of 5 min steaming sample was highest among steaming and canning conditions. ATP, ADP, and AMP contents of raw $P.$$depressus$ roe sample was higher than those of $A.$$crassispina$and $H.$$pulcherrimus$ roe. Major fatty acids of the three raw sea urchin roe samples were myristic acid, palmitic acid, and EPA. S.F.A. content of raw samples of $A.$$crassispina$and $H.$$pulcherrimus$ roe was higher than U.F.A content, whereas U.F.A. content of $P.$$depressus$ roe was highest among the three raw samples. For minerals K, P, Fe, and Zn contents were highest in $A.$$crassispina$roe while Ca, Mg, Na, and Cu contents were highest in $H.$$pulcherrimus$ roe. For heavy metals, Cd, Pb and As were detected in all samples in trace amounts under the criteria of the Korea food codex.
This study was to compare the microshear bond strength $({\mu}SBS)$ of light- and chemically cured composites to enamel coupled with four 2-step self-etch adhesives and also to evaluate the incompatibility between 2-step self-etch adhesives and chemically cured composite resin. Crown segments of extracted human molars were cut mesiodistally, and a 1 mm thickness of specimen was made. They were assigned to four groups by adhesives used: SE group (Clearfil SE Bond) AdheSE group (AdheSE), Tyrian group (Tyrian SPE/One-Step Plus), and Contax group (Contax) Each adhesive was applied to a cut enamel surface as per the manufacturer's instruction. Light-cured (Filtek Z250) or chemically cured composite (Luxacore Smartmix Dual) was bonded to the enamel of each specimen using a Tygon tube. After storage in distilled water for 24 hours, the bonded specimens were subjected to ${\mu}SBS$ testing with a crosshead speed of 1 mm/minute. The mean ${\mu}SBS$ (n=20 for each group) was statistically compared using two-way ANOVA, Tukey HSD, and t test at 95% level. Also the interface of enamel and composite was evaluated under FE-SEM. The results of this study were as follows ; 1. The ${\mu}SBS$ of the SE Bond group to the enamel was significantly higher than that of the AdheSE group, the Tyrian group, and the Contax group in both the light-cured and the chemically cured composite resin (p < 0.05). 2. There was not a significant difference among the hdheSE group, the Tyrian group, and the Contax group in both the light-cured and the chemically cured composite resin. 3. The ${\mu}SBS$ of the light-cured composite resin was significantly higher than that of the chemically cured composite resin when same adhesive was applied to the enamel (p < 0.05). 4. The interface of enamel and all 2-step self-etch adhesives showed close adaptation, and so the incompatibility of the chemically cured composite resin did not show.
Park, Ha Ju;Han, Se Jong;Yim, Joung Han;Kim, Dockyu
Korean Journal of Microbiology
/
v.54
no.1
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pp.60-68
/
2018
A cold-active and alkaline serine protease (Pro21717) was partially purified from the Antarctic marine bacterium Pseudoalteromonas arctica PAMC 21717. On a zymogram gel containing skim milk, Pro21717 produced two distinct clear-zones of approximately 37 kDa (low intensity) and 74 kDa (high intensity). These were found to have identical N-terminal sequences, suggesting they arose from an identical precursor and that the 37 kDa protease might homodimerize to the more active 74 kDa form of the protein. Pro21717 displayed proteolytic activity at $0-40^{\circ}C$ (optimal temperature of $40^{\circ}C$) and maintained this activity at pH 5.0-10.0 (optimal pH of 9.0). Notably, relative activities of 30% and 45% were observed at $0^{\circ}C$ and $10^{\circ}C$, respectively, in comparison to the 100% activity observed at $40^{\circ}C$, and this enzyme showed a broad substrate range against synthetic peptides with a preference for proline in the cleavage reaction. Pro21717 activity was enhanced by $Cu^{2+}$ and remained stable in the presence of detergent surfactants (linear alkylbenzene sulfonate and sodium dodecyl sulfate) and other chemical components ($Na_2SO_4$ and metal ions, such as $Ba^{2+}$, $Mg^{2+}$, $Ca^{2+}$, $Zn^{2+}$, $Fe^{2+}$, $K^+$, and $Na^{2+}$), which are often included in commercial detergent formulations. These data indicate that the psychrophilic Pro21717 has properties comparable to the well-characterized mesophilic subtilisin Carlsberg, which is commercially produced by Novozymes as the trademark Alcalase. Thus it has the potential to be used as a new additive enzyme in laundry detergents that must work well in cold tap water below $15^{\circ}C$.
Kim, Myeong-Gil;Kim, Young-Sug;Kim, Young-Su;Lee, Seong-Bong;Ryu, Kyong-Shin;Yoon, Mi-Hye;Lee, Jong-Bok
Journal of Food Hygiene and Safety
/
v.29
no.2
/
pp.99-104
/
2014
This study was done to analyze the contents of minerals and to investigate the ratio of measured values to labeled values and to analyze the ratio of calcium to other minerals in 68 specimen with minerals - fortified commercial beverages, noodles, cereals and grain products. Content of calcium, iron and zinc in samples after microwave digestion was analyzed with an ICP-OES. The measured values of calcium were ranged 82.2~293.1% of the labeled values in 38 samples composed calcium - fortified commercial beverages, noodles, cereals and grain products. The measured values of iron and zinc were ranged 83.3~301.0%, 90.1~314.1% of the labeled values in minerals - fortified commercial beverages, noodles, cereals and grain products, 42, 24 samples. The Ca : Fe ratios were 90.55 (50.55~220.64) in fruit & vegetable juice, 850.41 in fruit & vegetable beverage, 553.49 in blended beverage, 179.07 (118.37~238.01) in soy milk, 204.39(41.64~397.52) in noodle, 296.97(121.64~868.88) in fried noodle, 30.89(15.69~62.05) in cereal and 7.73(0.22~49.92) in grain product. The Ca : P ratios were 1.44(0.96~1.98) in fruit & vegetable juice, 1.92 in fruit & vegetable beverage, 1.66 in blended beverage, 4.23(2.25~7.72) in soy milk, 1.14(0.28~1.97) in noodle, 1.88(1.17~2.42) in fried noodle, 1.29(0.87~2.92) in cereal and 0.30(0.06~1.57) in grain product. The Ca : Mg ratios were 1.85(0.87~5.04) in fruit & vegetable juice, 28.72 in fruit & vegetable beverage, 2.97 in blended beverage, 5.27(2.93~9.36) in soy milk, 3.97(1.34~7.57) in noodle, 6.77(4.63~10.78) in fried noodle, 4.40(2.30~12.55) in cereal and 1.17(0.23~7.48) in grain product. These results suggest calcium contents and the ratio of calcium contents to other minerals in calcium-fortified food products should be strictly controlled. Moreover, to avoid problems with Excessive nutrition, there must be initiatives for better understanding on food labelling and nutrition for fortified food.
We studied the nutritional status of on mentally handicapped children living at home or in institutions since early teenage years are nutritionally important. The subjects of 7 to 12 year old mentally retarded children attenending a special education school in Seoul were surveyed with questionnaires as well as 2-day dietary recall records, with the help of persons of their care-giver when needed. Among the 64 children,54.7% are living in institutions and the rest of them are living at home. They were ranged from the trainable (64.1%) , the educable (26.6%) , and the non-trainable (9.4%) . Their average daily intake of energy intakes (%RDA) was 2,070.1 kcal (94.1%) , Ca 603.9 mg (75.5%) , Fe 11.1 mg (92.5%), Vt.A 507.5 RE (84.6%) , Vt. B$_2$.1g (88.2%), niacin 14.1 g (93.6%) and Vt. C 58.2 g (83.1%) . Their average intakes of these nutrients were significantly higher in subjects of institutions than at home. The nutrients consumed at a much higher level than the RDh of the normal children were Vt. B, (1.6 g,146.8%) and protein (75.3g, 136.9%) . The higher percentage of children at home were under consumed of several nutrients (< 75% RDA) than ones in institutions. When comparing the degree of handicap, energy and nutrient intakes except Vt. C were highest in educable children than trainable ones or Dawn's children. MAR of the diets of the subjects was 0.84. Children at home showed lower MAR as well as NAR of each nutrients, whereas children belonged to INQ < 1 were less at home. Handicapped children at home were snacking higher amount relative to their calorie intake and too frequently, that may lead to their poor nutrition. There was positive correlations between factors of nutrition and physical and dietary behaviors, but there were no correlations between factors of nutrition and health-related habits. Nutritional caring mentally handicapped children in institutions seemed to be more effectively managed.
Journal of the Korea Academia-Industrial cooperation Society
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v.18
no.4
/
pp.1-7
/
2017
Cobalt silicide was used as a counter electrode in order to confirm its reliability in dye-sensitized solar cell (DSSC) devices. 100 nm-Co/300 nm-Si/quartz was formed by an evaporator and cobalt silicide was formed by vacuum heat treatment at $700^{\circ}C$ for 60 min to form approximately 350 nm-CoSi. This process was followed by etching in $80^{\circ}C$-30% $H_2SO_4$ to remove the cobalt residue on the cobalt silicide surface. Also, for the comparison against Pt, we prepared a 100 nm-Pt/glass counter electrode. Cobalt silicide was used for the counter electrode in order to confirm its reliability in DSSC devices and maintained for 0, 168, 336, 504, 672, and 840 hours at $80^{\circ}C$. The photovoltaic properties of the DSSCs employing cobalt silicide were confirmed by using a simulator and potentiostat. Cyclic-voltammetry, field emission scanning electron microscopy, focused ion beam scanning electron microscopy, and energy dispersive spectrometry analyses were used to confirm the catalytic activity, microstructure, and composition, respectively. The energy conversion efficiency (ECE) as a function of time and ECE of the DSSC with Pt and CoSi counter electrodes were maintained for 504 hours. However, after 672 hours, the ECEs decreased to a half of their initial values. The results of the catalytic activity analysis showed that the catalytic activities of the Pt and CoSi counter electrodes decreased to 64% and 57% of their initial values, respectively(after 840 hours). The microstructure analysis showed that the CoSi layer improved the durability in the electrolyte, but because the stress concentrates on the contact surface between the lower quartz substrate and the CoSi layer, cracks are formed locally and flaking occurs. Thus, deterioration occurs due to the residual stress built up during the silicidation of the CoSi counter electrode, so it is necessary to take measures against these residual stresses, in order to ensure the reliability of the electrode.
Journal of the Korean Society of Marine Environment & Safety
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v.27
no.1
/
pp.172-178
/
2021
In the ship repair market, interest in maintenance and repair is steadily increasing due to the reinforcement of prevention of environmental pollution caused by ships and the reinforcement of safety standards for ship structures. By reflecting this effect, the number of requests for repairs by foreign shipping companies increases to repair shipbuilders in the Southwest Sea. However, because most of the repair shipbuilders in the southwestern area are small and medium-sized companies, it is difficult to lead to the integrated synergy effect of the repair shipbuilding companies. Moreover, the infrastructure is not integrated; hence, using the infrastructure jointly is a challenge, which acts as an obstacle to the activation of the repair shipbuilding industry. Floating docks are indispensable to operating the repair shipbuilding business; in addition, most of them are operated through renovation/repair after importing aging caisson docks from overseas. However, their service life is more than 30 years; additionally, there is no structure inspection standard. Therefore, it is vulnerable to the safety field. In this study, the finite element analysis program of ANSYS was used to evaluate the structural safety of the modified caisson dock and obtain additional structural reinforcement schemes to solve the derived problems. For the floating docks, there are classification regulations; however, concerning structural strength, the regulations are insufficient, and the applicability is inferior. These insufficient evaluation areas were supplemented through a detailed structural FE-analysis. The reinforcement plan was decided by reinforcing the pontoon deck and reinforcement of the side tank, considering the characteristics of the repair shipyard condition. The final plan was selected to reinforce the side wing tank through the structural analysis of the decision; in addition, the actual structure was fabricated to reflect the reinforcement plan. Our results can be used as reference data for improving the structural strength of similar facilities; we believe that the optimal solution can be found quickly if this method is used during renovation/repair.
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