• Food Science and Preservation
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• v.16 no.4
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• pp.549-553
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• 2009

The mushroom Agrocybe chaxingu was analyzed to evaluate the nutritional value of this potential food. The moisture content was 88.9% in the fruiting body of A. chaxingu, and the proportions of ash, crude fiber, carbohydrate, crude protein, and crude fat were 0.9%, 1.4%, 7.2%, 2.5% and 0.4% by weight, respectively. A. chaxingu contained 1.29 mg/100 g edible weight of vitamin $B_1$, and the contents of vitamin $B_2$, vitamin $B_3$, and vitamin C were 0.15 mg, 0.32 mg, and 18.4 mg per 100 g of wet mushroom. Potassium (3,318 mg/100 g, dry basis) was found at the highest concentration in A. chaxingu. In addition, the mushroom contained many other minerals (all figures are mg per 100 g of dried mushroom) such as phosphorus (909.7), magnesium (141.3), sodium (12.7), zinc (7.4), iron (6.5), copper (2.8), manganese (0.8), and nickel (0.1). The results indicate that A. chaxingu is a valuable nutrient source.

• Journal of Life Science
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• v.30 no.12
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• pp.1085-1091
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• 2020

The purpose of this study was to investigate the value of residue discarded after harvesting a species of pepper (Capsicum annuum L.). This study analyzed the physiological activity and cytotoxicity of a fermented extract and a hot water extract gathered from the residues of the Cheongyang pepper and the Nokkwang pepper. The total nitrogen, phosphoric acid, potassium, calcium, and magnesium contents of the fermented extract of the Nokkwang pepper were approximately twice as high as those of the Cheongyang pepper, while the hot water extracts had similar levels of these components across both peppers. Among the microelements, only boric acid, iron, and silicon components were detected, whereas zinc, manganese, molybdenum, and copper components were not detected in either extract. The total polyphenol and flavonoid contents of the fermented extracts were more than two times higher than those of the hot water extracts for both peppers. The DPPH radical scavenging ability (indicating antioxidant activity) of the fermented extract was higher than that of the hot water extract, while the ABTS radical scavenging ability (indicating antioxidant activity) of the hot water extract was higher than that of the fermented extract. A cytotoxicity test was conducted on the extracts using an MTT assay. Both extracts exhibited weak cytotoxicity at all concentrations for both peppers. These results suggest that the extract of residue discarded after harvesting these peppers could be suitable for functional feed or agricultural materials.

• Journal of the Korean Society of Food Science and Nutrition
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• v.14 no.3
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• pp.289-295
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• 1985

This experiment aimed to find out the most effective condition of drawing method when making tea by determination of the contents of minerals infused from four kinds of green tea samples of market with its different drawing time and temperature. The mineral contents in 100 grams of raw green tea leaves revealed $1737{\sim}3000\;mg$ potassium, $178{\sim}205\;mg$ magnesium, $171{\sim}201\;mg$ calcium, $54{\sim}71\;mg$ manganese, $24{\sim}50\;mg$ sodium, $11.6{\sim}12.3\;mg$ iron, $3.4{\sim}5.3\;mg$ copper and $4.6{\sim}5.9\;mg$ zinc. The values showed some variation in their contents according to the kinds of raw green tea samples. The decreasing order of the amounts of minerals infused from the green tea samples was K, Zn, Mg, Mn, Fe, Na, Cu and Ca. The amount of minerals infused from the green tea leaves increased with increase in the drawing time and temperature. The total infusion amount of minerals was remarkably larger when drawing time was three minutes with three times repetition than when it was eight minutes without repetition at the same temperature.

• Journal of Nutrition and Health
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• v.12 no.3
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• pp.25-32
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• 1979

In order to investigate harmful trace elements in ford additives used in food processing the contents of Copper, Lead, Cadmium, Chromium, Manganese, Nickel and Iron are determined by Atomic Absorption Spectrophotometer. These Elements are Extracted with APDC-MIBK extract method. Samples are collected from the food Industrial companies in Korea. Samples studied as shown in Table 1 are food colors(3-samples, Flavoring Agents(7-samples), Acidifiers(4-samples) Baking Powders(4-samples), Emulsifiers(2-samples), Thickeners(2-samples), Antioxidants(2-samples), Intensifiers(2-samples), Seasonings(3-samples), modifiers (10-samples) Most of the food additives contained comparatively a little small amount of harmful trace elements. However, the contents of harmful trace elements of Sodium Carbonate, Food Yellow No.5, Food Blue No.1, Food Red No.2 and Alkalies added in noodles are significantly higher than the other food additives. The obtained results are as follows ; 1) Sodium Carbonate contained Cadmium; 16.73 ug/g and Lead ; 61.55 ug/g. 2) Food Yellow No. 5 contained Cadmium: 1.67ug/g and Lead; 23.46 ug/g. 3) Food Blue No. 1 contained Cadmium; 1. 16 ug/g and Lead; 23.46 ug/g. 4) Food Red Ho. 1 contained Cadmium; 1.91 ug/g and Lead 23.08 ug./g. 5) Alkalies added in noodles contained Cadmium; 6. 11 ug/g and Lead; 53.85 ug/g.

• Journal of the Korea Institute of Building Construction
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• v.18 no.5
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• pp.419-427
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• 2018

The purpose of this study is to recycle steel slag generated from the iron producing process and to use steel slag as a construction material which is currently landfilled Steel slag is subjected to aging treatment due to the problem of expansion and collapse when it reacts with water. The Slag Atomizing Technology (SAT) method developed to solve these problems of expanding collapse of steel slag. In this study, experimental study on the emergency repair mortar using the reducing slag, electric arc furnace slag and silicon manganese slag manufactured by the SAT method is Reduced slag was shown an accelerated hydration when it was replaced with rapidly-setting cement, and the rate of substitution was equivalent to 15%. It is shown that the electric furnace oxide slag is equivalent to 100% of the natural aggregate, and it can be replaced by 15-30% when the silicon manganic slag is substituted for the electric furnace oxide slag. With the above formulation, it was possible to design the rapidly repair mortar for road use. These recycling slags can contribute on achieving sustainability of construction industry by reducing the use of cement and natural aggregates and by reducing the generation of carbon dioxide and recycling waste slag.

• Journal of Korean Society of Forest Science
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• v.86 no.4
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• pp.435-442
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• 1997

The research was carried out to investigate the contamination of stream water by the acid mine drainage originated from the abandoned coal mines and coal waste rock in Keumsan, Chungnam. The pH, sulfate and chemical compositions in the stream water were analyzed. At the polluted sites, the pH of stream water was the strong acid, ranging from 3.46 to 4.29. The pH shows negative correlations with sulfate, manganese, copper, zinc, iron and magnesium concentrations. Sulfate concentrations of the polluted stream water, 236.73-310.53mg/l, had 10 times more than those of the non-polluted stream water. The concentrations of heavy metals, Mn and Fe, in the polluted water were 0.56 - 0.83mg/l and 5.89 - 10.58mg/l, respectively. The Mn concentrations were 20 times higher than those of the non-polluted stream water. Compared with those in the non-polluted stream water, the Mg and Ca concentrations in the polluted stream water were high because of leaching from rock and soil to water by the acidifications. Calculated AMDI(Acid Mine Drainage Index) values are low in the polluted stream water, relative to those of the non-polluted water.

• Resources Recycling
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• v.15 no.6 s.74
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• pp.48-55
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• 2006

This study was carried out for establishing the physical recycling technique for commercializing process on household batteries. The procedure involves shape separator, crushing, magnetic separation, classification and eddy current separation in sequence. The separation capacity was 400-600 unit cell/hr with shape separation system. The impurities such as manganese and zinc in the magnetic product were below 0.1% respectively, the concentration of iron was above 99% in spent carbon zinc battery. Also non-magnetic products are composed of 22-30% En, 16-22% Mn, 1-3% Fe in the case oi spent zinc carbon battery. The amounts of other components such as carbon rod, plastics and separator were about 37-50%. From the eddy current separation of nonferrous products, the plate-type zinc components were separated up to 96% with 2,250-2,750 meter/min of the conveyor speed.

• Journal of the Korean Magnetics Society
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• v.18 no.1
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• pp.24-27
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• 2008

We have prepared $MnFe_2O_4$ nanoparticles with polyol method. The crystallographic and magnetic properties were measured by using X-ray diffraction(XRD), vibrating sample magnetometer(VSM) and $M\"{o}ssbauer$ spectroscopy. The high resolution transmission electron microscope(HRTEM) shows uniform nanoparticle-sizes with $6{\sim}8$ nm. The crystal structure is found to be single-phase cubic spinel with space group of Fd3m. The lattice constant of $MnFe_2O_4$ nanparticles is determined to be $8.418{\pm}0.001{\AA}$. $M\"{o}ssbauer$ spectrum of $MnFe_2O_4$ nanparticles at room temperature(RT) shows a superparamagnetic behavior. In VSM analysis, the diagnosis of the superparamagnetic behavior is also shown in hysteresis loop at RT. $M\"{o}ssbauer$ spectrum at 4.2K shows that the well developed two sextets are with different hyperfine field $H_{hfA}=498$(A-site) and $H_{hfB}=521$(B-site) kOe.

• Membrane Journal
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• v.24 no.3
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• pp.201-212
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• 2014

This study was performed to discover the optimum operation conditions for the advanced water treatment using the ceramic membrane, introduced the first in the nation at the Y water treatment plant (WTP). The result of investigation to find the optimum operation conditions which can continue preserving the filtration performance as well as satisfying both the economics and the water quality is as follows. In the ordinary water quality condition of the Y WTP, the optimum filtration time(the backwash period), which can minimize the production of backwash waste and preserve the membrane performance was examined to be 4.0 hours on basis of institution capacity ($16,000m^3/day$). Examining the recovery rate of TMP from the chemical cleaning (CIP) discovered that the inorganic contaminants, which cause membrane fouling, such as iron, manganese, aluminum, were removed through the acidic cleaning using citric acid, whereas the membrane recovery rate was found to be low. But, on the other hand, the TMP was recovered to the initial value from the alkali cleaning using the NaOCl. Therefore, the main contaminant causing the fouling was determined to be hydrophilic organic compound( biopolymer). The membrane recovery rate is highly influenced by the temperature of the cleaning chemical. That is, the rate increased with increasing temperature.

• Korean Journal of Soil Science and Fertilizer
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• v.15 no.4
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• pp.258-269
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• 1982

The nutritional status of fruit leaves of sweet persimmon and soil conditions were observed in the fifty five blocks of fruit farms of sweet persimmon in Gimhae, Gyeong-nam area. 1. The soil of fruit farm was composed of more than 20% of gravel in the most part of the fruit farms. 2. The strong acidity was observed in the soil of young fruit farms but the acidity of the farm soils was improved to week acid with increase of age of fruit trees. 3. The great variation in the content of available phosphate were observed in the soil from different fruit farm blocks and the lime content were relatively low in the most of the farm soils. 4. The contents of nitrogen, phosphate and potassium in leaves of sweet persimmon collected in July and October were lower than those collected in May but reverse tendency was observed in the content of calcium, magnesium and sodium. 5. The content of boron in leaves collected in May was similar to that collected in July but extremely high content of boron was observed in the loaves collected in October, harvesting period of sweet persimmon. 6. The contents of iron and manganese in the leaves of sweet persimmon were observed to be relatively high compared to the content in the leaves of other fruit trees. 7. The relatively great variation in such inorganic components as iron, copper and boron was observed in the fruit leaves of sweet persimmon according to the different fruit farm blocks. 8. The ages of fruit trees didn't have an effect on the content of inorganic components in the fruit leaves except the content of nitrogen which was decreased with the increase of the ages of fruit trees.