• Korean Journal of Medicinal Crop Science
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• v.3 no.2
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• pp.128-134
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• 1995

Gigolphy(Lycii cortex Radicis) wine and its chemical components and physical properties were prepared and analyzed for development of Boxthorn product and utilization of Boxthorn. Chemical components and physical properties of this wine was analyzed. When this wine were evaluated by Amerine test and by concerning physico-chemical properties, the recipy including 20 % of sugar, and 2.0 % of Gigolphy powder were the most highly recommended for development of Gigolphy wine.

• Korean journal of food and cookery science
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• v.2 no.1
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• pp.11-16
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• 1986

Physicochemical properties and fatty acid composition of 12 randomly selected Korean margarines were determined, which were stored within one month since manufactured. Average moisture and fat contents of margarines were 15.09% ana 77.92% respectively. Melting point was ranged from 33.23$^{\circ}C$ to 42. 13$^{\circ}C$. Acid value and peroxide value were very low. iodine value was ranging from 59.65 to 86. 05. As a result of cluster analysis using the data of fatty acid composition, margarines divided into two groups according to their package condition, soft and hard type, were also classified into the same two groups. This probably implies that the raw materials of margarines between two groups were not the same. O1eic acid (18:1) and palmitic acid (16:0) in soft and hard type margarines respectively were the highest. Linoleic acid (18 : 2) contents showed large differences among margarines. Most of the margarines had little linolenic acid (18:3) . Generally essential fatty acid contents of Korean margarines were higher than those of the past but they didn't reach the levels of margarines made in some foreign countries.

• Textile Coloration and Finishing
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• v.8 no.5
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• pp.49-67
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• 1996

이 연구의 목적은 에틸렌이민 유도체를 갖는 아조계 분산 염료의 나일론 6.6 섬유에의 응용과 최적화된 나일론 염색 조건의 확립이다. 두 쌍의 염료 A-1/A-2와 D-1/D-2의 최대흡수파장(&{\lambda}_{max}&)을 비교할 경우, 아세톤 최대흡수파장(λ$_{max}$)의 차이가 없거나 적어졌다. 세가지 아지리디닐 모노 아조 염료와 이들 염료의 가수분해 된 형태 그리고 디메닐아닐린계 아조 염료의 나일론 6.6 섬유에 대한 염색 및 견뢰도 성질이 조사되었다. 아지리디닐 염료의 나일론 섬유상의 최대 염착은 pH 5에서 얻어졌으며, 염색된 나일론 섬유에서의 용매추출의 경우 최소 염료 추출은 pH 8.0-10.0 에서 얻어졌다. 아지리디닐 염료 염색된 나일론 섬유상의 세탁 견뢰도와 광 견뢰도는 염색 시 pH의 증가에 따라 증가하였으나, pH 8에서의 견뢰도 성질이 pH 10에서와 비교하여 보다 개선되었다. 세가지 아지리디닐 염료가 이들 염료의 가수분해 된 형태 그리고 디메틸아닐린계 아조 염료와 비교해서 나일론 6.6 섬유상에서 보다 개선된 견뢰도를 나타내었고 이는 염료와 섬유간의 공유 결합으로 기인한 것으로 여겨진다.

• Applied Chemistry for Engineering
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• v.8 no.2
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• pp.339-346
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• 1997

Liquid crystalline polyurethanes were prepared from 1,4-bis(6-hydroxyhexoxy)benzene (BHB6) and 2,5-tolylene diisocyanate (2,5-TDI) solution polymerization in dimethylformamide produced intrinsic viscosities in the range 0.26 and $0.42d{\ell}/g$. The polyurethanes were investigated by DSC, Polarizing microscopy, X-ray, $^1H$-NMR and IR spectroscopy. Polyurethanes of two different molecular weights were studied in detail and these will be referred to as low molecular weight and high molecular weight. Polyurethane 2,5-TDI/BHB6 with $[{\eta}]=0.26d{\ell}/g$ prepared from BHB6 and 2,5-TDI, exhibited monotropic liquid crystallinity, although these polyurethanes contained no mesogenic core unit. For example, LCPU-L(low molecular weight) exhibited $T_{I-LC}$ of $122^{\circ}C$ $T_{LC-K}$ $89^{\circ}C$.

• Korean Journal of Soil Science and Fertilizer
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• v.6 no.4
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• pp.205-211
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• 1973

General physical and chemical characteristics of eleven apple orchard soils derived from granite, granodiorite, diorite, arkose sandstone and shale were investigated in relation to soil profile. The results are summerized as follows: 1. Soils were mostly sandy and showed pH 4.35 to 6.75, 1.14 to 5.58 of organic matter, 0.065 to 0.209% of nitrogen. All properties decreased with depth. 2. Total exchangeable bases of surface soils were comparablly low (4.89 to 17.81me/100g, Ca>Mg>K>Na). Cation exchange capacity ranged from 7.74 to 21.72 mg/100g and base saturation percentage from 22.52 to 94.62%. 3. Phosphorus content of surface soil was very low (less than 35.5 mg/100g). The contents of potassium (7.2-79.2 mg/100g), available copper (1.0-16.9 ppm) and water soluble boron (0.18-0.72 ppm) were high in surface soil but low with depth. The content of manganese showed clear difference with pH, that is, at pH 4 to 6 water soluble manganese ranged from 0.42 to 17.8 ppm and exchangeable manganese from 9.82 to 66.38 ppm but above pH 6 the water soluble was less than 0.70 ppm and the exchangeable less than 22.25 ppm.

• Journal of the Korean Magnetics Society
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• v.4 no.4
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• pp.335-339
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• 1994

The crystallograpic and magnetic properties of $Eu(Fe_{1-x}In_{x})O_{3}$ (x=0, 0.03과 0.05) have been studied by the methods of X-ray diffraction, $M\"{o}ssbauer$ spectroscopy, and magnetic hysteresis measurement at room temperature. The X-ray results show that the samples have a crystal structure of orthorhombic and unit cell volume of the crystal with the exception of the sample of x=0 increases as increasing the In concentration. In the analysis assuming two sets of six-line of $M\"{o}ssbauer$ spectra, it is found that the magnetic hyperfine field in each of sets decreases increasing x. The linewidth of the absorption lines for the samples increased as increasing x. This implies that the data involve a sum of several hyperfine patterns which have intensity being proportional to $_{n}P_{z}(x)$, the probability of an environment with z such Fe neighbors. The magnetic hysteresis curves show decrease of $M_{s}$ and increase of $H_{c}$ of the samples with increasing x.

• Polymer(Korea)
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• v.32 no.3
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• pp.256-262
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• 2008

Copolyimides containing pendant trifluoromethyl ($CF_3$) groups were synthesized from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and bis[4-(3-aminophenoxy)phenyl]sulfone (BAPS) with various concentrations of 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane(BAPP) to poly(amic acid)(PAA), followed by thermal imidization. These copolyimides were readily soluble in N,N'-dimethylacetamide (DMAc) and could be solution-cast into a flexible and tough film. The thermomechanical properties, morphology and an optical transparency of the copolyimide films were determined using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), wide angle X-ray diffraction (XRD), scanning electron microscopy (SEM), universal tensile machine (UTM), and a UV-Vis spectrometer. The cast copolyimide films exhibited high optical transparency with a cut-off wavelength (${\lambda}_0$) of $275{\sim}319\;nm$ in UV-vis absorption and a low yellow index(YI) value of $3.65{\sim}10.37$. The thermo-mechanical properties of copolyimide films were enhanced linearly with increasing a BAPP content. In contrast, the optical transparency of the copolyimide films was found to get worse with increasing a BAPP content.

• Microbiology and Biotechnology Letters
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• v.6 no.1
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• pp.27-31
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• 1978

The malo-alcoholic fermentation characteristics of Schiozaccharomyces japonicus var. japonicus which was freshly isolated from strawberry were studied. A good assimilation of malic acid by the strain was observed under the following conditions：pH 4.2∼4.8, alcohol content less than 12％, sulfur dioxide concentration less, than 150 ppm, and less than 0.01％ of Mn$\^$2＋/ as MnSO$_4$. The strain could remove 0.3％ of malic acid completely in 6 days under stationary culture at 30$^{\circ}C$. Shaking the culture could promote growth of the strain but did not affect on the malo-alcoholic fermentation.

• Journal of Korean Society of Forest Science
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• v.76 no.1
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• pp.33-40
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• 1987

Simulated acid rain (pH 4.0, pH 2.0) containing sulfuric and nitric acid in the ratio of 60:40 (chemical equivalent basis) diluted with underground water, and underground water (pH 6.5) as control were treated on potted Pines koraiensis seeds during the growing season (May 1 to August 31) in 1985. The regime of artificial acid rain, in terms of spray frequency and amount per plot, was simulated on the basis of climatological data averaged for 30 years of records. The seedling growth, contents of chemical substances in needles and chemical properties of the tested soil were compared among the various pH levels of acid rain on October 31, 1985. Following results were obtained. 1. With decreasing pH levels of acid rain, S and $K_2O$ contents in leaf tissue were increased, but MgO and $P_2O_5$ contents were decreased. 2. Soil pH was dropped, and exchangeable aluminum content in the tested soil was dramatically increased as the pH levels of acid rain decreased. 3. Exchangeable calcium, magnesium, potassium contents, and base saturation degree of the soil were significantly decreased with decreasing pH levels of acid rain. 4. Sulfate concentrations in the soil were significantly increased as rain pH decreased, but total nitrogen and available phosphate contents were not influenced by acid rain.

• Korean Journal of Food Science and Technology
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• v.15 no.2
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• pp.141-149
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• 1983

The purpose of the present work is to find out the optimal conditions for the production of filefish protein preparations and to define the functional properties of the protein products. Fish protein concentrate (FPC) and fish protein isolate (FPI) were prepared by extraction of whole or headed and gutted filefish with various organic solvents. The results of the present study are as follows; 1. Among the solvents tested iso-propyl alcohol appeared to be the most effective for the extraction of lipid and also for that trimethylamine from the fish muscle. 2. The optimal extraction time showed to be 20 minutes with ethyl iso-propyl alcohol at $65-70^{\circ}C$under adequate mixing. 3. The most effective solvent ratio to the weight of fish material was proved to be 5:1 at the first extraction and to be 2:1 at the second stage. 4. The lipid content of the protein preparations reduced to below 0.5% by the third stage of extraction of headed or gutted filefish. The protein concentrate from whole fish, however, showed the lipid content of 0.27-0.31% only after the fifth stage of extration. 5. The protein contents of the protein concentrate and the protein isolate from whole filefish were 81.08% and 87.41% and the lipid contents of the two protein preparations were 0.43% and 0.45% respectively. 6. Higher calcium content was found in the protein concentrate rather than in the protein isolate. No sodium and potassium in the protein isolate were detected while the fish concentrate appeared to contain a considerable amounts of both elements. 7. The functional properties, such as suspended solids, wetability, emulsion stability and foam viscosity of the filefish protein isolates were proved to be higher than those of the protein concentrate.