• Bulletin of the Korean Chemical Society
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• v.33 no.2
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• pp.725-727
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• 2012

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.117-118
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• 2007

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2006.10a
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• pp.89-90
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• 2006

• 대한생식의학회:학술대회논문집
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• 2006.06a
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• pp.171.1-171.1
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• 2006

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.129-130
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• 2006

• Bulletin of the Korean Chemical Society
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• v.27 no.9
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• pp.1289-1292
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• 2006

Potassium(I) with 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate (L) assembles to K($H_2O$)L (L = 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate). It was characterized by single-crystal X-ray diffraction, element analysis, IR and $^1H$ NMR spectroscopy. It crystallizes in the monoclinic space group $P2_1$/n and reveals a seven-coordinate complex. Polyhedra potassium chains, C-H${\cdot}{\cdot}{\cdot}\pi$ and C-H${\cdot}{\cdot}{\cdot}$O and O-H${\cdot}{\cdot}{\cdot}$O hydrogen bonds lead K($H_2O$)L to a three-dimensional network structure. The biological activity of resistance to hypoxia was tested, and the results showed that the biological activity of resistance to hypoxia of K($H_2O$)L is as good as that of its precursor, irisolidone.

• Journal of the Korean Applied Science and Technology
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• v.3 no.1
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• pp.65-71
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• 1986

Four amphoteric surfactants, 1-(N-alkyl-N,N-dimethyl ammonio)-4-naphthalene sulfonates, were prepared by the alkylation of 1-(N,N-dimethylamino)-4,naphthalene sulfonic acid with chloroalkanes such as 1-decylchloride, 1-tetradecyl chloride and 1-hexadecyl chloride. These quaternary ammonium compounds such as 1-(N-decyl-N, N-dimethylammonio)-4-naphthalene sulfonate, 1-(N-dodecyl-N,N-dimethylammonio)-4-naphthalene sulfonate, 1-(N-tetradecyl-N,N-dimethylammonio)-4-naphthalene sulfonate and 1-(N-hexadecyl-N,N-dimethylammonio)-4-naphthalene sulfonate could be separated by means of thin layes chromatography and column chromatography. The surface chemical properties such as surface tension, foaming power, foam stability, wetting efficiency and solubilizing effect for these four compounds were measured. Also critical micelle concentration and hydrophilic-lipophilic balance(HLB) were evaluated. These compounds showed good surface as O/W type emulsifying agent and detergent.

• Microbiology and Biotechnology Letters
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• v.22 no.3
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• pp.271-276
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• 1994

The strain S4-14 which produced alkaline lipase and had resistance against linear alkylbenzene sulfonate was isolated from soil or water samples. The isolated strain S4-14 was identified a species belong to Pseudomonas. Alkalin lipase secreted by Pseudomonas sp. S4-14 was purified by ammonium sulfate precipitation procedure follwed by DEAE-Cellulose, DEAE-Sepharose and gel filtration chromatohraphies with 995.15 U/mg protein and 16.1% yield. The molecular weight of the enzyme was estimated to be 65,000 dalton by SDS-PAGE. The optimum pH and temperature of the purified enzyme was 10.5 and 45$\circ $C, respectively. The emzyme was stable at 45$\circ $C for 1 hr and in a pH range from 8.0 to 12.0 for 24 hr at 4$\circ $C. The activity of lipase was enhanced by Ca$^{2+}$ while inhibited strongly by Pb$^{2+}$, Zn$^{2+}$ or Fe$^{3+}$. The activity of lipase was inactivated about 50~60% in the presence of 50 mg/l linear alkylbenzene sulfonate, $\alpha $-olefin sulfonate, alcohol ethoxylate or perborate.

• Microbiology and Biotechnology Letters
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• v.19 no.1
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• pp.57-63
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• 1991

A strain J-19 was isolated from soil, produced lipase which has resistant against alkali and linear alkylbenzene sulfonate. The strain was identified as Pseudornonns sp.. The enzyme was purified by ammonium sulfate precipitation, DEAE-Sephadex and Sephadex G- 100 column chromatography. The specific activity of the purified enzyme was 35 unit/mg protein and the yield of enzyme activity was 17%. The purified enzyme showed a single band on polyacrylamide disc gel electrophoresis. Mo1ecul;tr weight of the purified enzyme was estimated about 36,000 by Sephadex GI00 gel filtration and SDS-polyacrylarnide gel electrophoresis. The optimum pH and temperature were pH 10.0 and $30^{\circ}C$, respectively. Activity of the purified enzyme was increased 2-fold by the addition of 0.1% linear alkylbenzene sulfonate and 2.5- fold by the addition of 0.05% Tide. This enzyme remained stable from pH 8.0 to 10.0 and stable up to $40^{\circ}C$.

• Journal of the Korean Chemical Society
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• v.48 no.6
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• pp.561-567
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• 2004

The influence of ultrasound frequency, dissolved gases, and initial concentration on the decomposition of sodium dodecylbenzene sulfonate(DBS) aqueous solution was investigated using ultrasound generator with 200 W ultrasound power. The decomposition rates at three frequencies(50, 200, and 600 kHz) examined under argon atmosphere were highest at 200 kHz. The highest observed decomposition rate at 200 kHz occurred in the presence of oxygen followed by air and argon, helium, and nitrogen. The effect of initial concentration of DBS on the ultrasonic decomposition was decreased with increasing initial concentration and would depend upon the formation of micelle in aqueous solution. It appears that the ultrasound frequency, dissolved gases, and initial concentration play an important role on the sonolysis of DBS. Sonolysis of DBS mainly take place at the interfacial region of cavitation bubbles by both OH radical attack and pyrolysis to alkyl chain, aromatic ring, and headgroup.