• Analytical Science and Technology
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• v.12 no.2
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• pp.111-115
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• 1999

Single column anion chromatography by indirect UV detection was applied to the determination of 7 common anions($H_2PO_4^-$, $Cl^-$, $NO_2^-$, $NO_3^-$, $I^-$, $SO_4^{2-}$, $SCN^-$). A low capacity silica-based anion-exchange column(TSK guardgel QAE-SW; ca. 0.3 meq./g; 4.6 mm i.d${\times}$150 mm) was used. In separating common anions, we compared naphthalene trisulfonic acid(NTS) and naphthalene disulfonic acid(NDS) to find more sensitive, selective and rapid separation method. And cations and anions can be separated simultaneously in 0.20 mM NTS-5% acetonitrile-water.

• Journal of Microbiology and Biotechnology
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• v.9 no.4
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• pp.482-487
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• 1999

The Pseudomonas sp. strain NGK1 (NCIM 5120) was immobilized in calcium alginate, agar, and polyacrylamide gel matrices. The salicylic acid-producing capacity of freely suspended cells was compared with immobilized cells in batches with a shake culture and continuous culture system in a packed bed reactor. Freely suspended cells ($4\times10^{10}cfu/ml$) produced 12 mM of salicylic acid, whereas cells immobilized in calcium alginate ($1.8\times10^{11}$cfu/g beads), agar ($1.8\times10^{11}$cfu/g beads), and polyacrylamide ($1.6\times10^{11}$cfu/g beads) produced 15, 11, and 16mM of salicylic acid, respectively, from naphthalene at an initial concentration of 25 mM. The continuous production of salicylic acid from naphthalene was investigated in a continuous packed bed reactor with two different cell populations. The longevity of the salicylic acid-producing activity of the immobilized cells from naphthalene was also studied in semi continuous fermentations. The immobilized cells could be reused 18, 13, and more than 20 times without losing salicylic acid-producing activity in calcium alginate-,agar-, and polyacrylamide-entrapped cells, respectively. The study reveals a more efficient utilization of naphthalene and salicylic acid production by the immobilized Pseudomonas sp. strain NGK1 as compared to the free cells.

• 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.

• Applied Biological Chemistry
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• v.32 no.3
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• pp.315-320
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• 1989

Bacteria utilizing naphthalene as a sole carbon source for growth were isolated and identified and code named as Acinetobacter calcoaceticus R-88, Pseudomonas testosteroni R-87 and Pseudomonas putida R-89. Among these isolates, A. calcoaceticus R-88 found most effective in utilizing naphthalene. The optimal pH, temperature and concentration of naphthalene was 7.0, $30^{\circ}C$ and 10mM, respectively. The strain degraded naphthalene to salicylic acid as an intermediate. And the strain showed to be resistant to ampicillin, tetracyclin, chloramphenicol and kanamycin. A. calcoaceticus R-88 harbored plasmid DNA which was believed to be involved in naphthalene degradation.

• Journal of the Korean institute of surface engineering
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• v.39 no.1
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• pp.13-17
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• 2006

The effects of an organic additive, naphthalene trisulfonic acid (NTSA), contained in the nickel sulfamate bath on the surface properties of the electrodeposited nickel layer were investigated through electrochemical technique, x-ray diffraction analysis, and microscopic observation. The addition of NTSA facilitated the oxidation process of electrodeposited nickel layer during anodic scan and also increased the hardness and internal stress of the nickel film as the applied current density became higher. It seems that NTSA modulated the deposit structure during electrodeposition and so induced higher distribution of (110) orientation with respect to (200). With the increase of the NTSA in the bath, nickel layer was formed in small grain size, which resulted in enhanced surface evenness and brightness.

• Journal of Microbiology
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• v.39 no.4
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• pp.338-342
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• 2001

Pseudomonas fluorescens SM11 is a naphthalene-degrading strain whose dissimilatory genes are cho-mosomally encoded. We have cloned the 2.9 kb Sal I fragment harboring genes for the naphthalene-degrading upper pathway. The nucleotide sequences were determined to be nahQ, napA, and partial regions of nahE genes. The nahQ encods a protein of 188 amino acid residues with a deduced molec-ular wight of 20.8kDa. The high homology with other proteins suggests that NAhQ may be an active and useful protein whtich gives as selective advantage to naphthalene degradatin. Transposase(TnpA)encodes a polypetide chain with a molecular mass of 41.8kDa consisting of 376 amino acid residues. The deduced anino acid sequence of tnpA revealed 96% idenitity with putative transposase of P. stutzeri OX1,. It was assumed that transposase plays an important role in the evloution of the catabloic-path way in the regulation of nah expression.

• Applied Chemistry for Engineering
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• v.10 no.6
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• pp.863-870
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• 1999

The catalytic performance of Co-Mn-Br system was performed in the 2,6-dimethylnaphthalene(DMN) oxidation at relatively mild reaction conditions such as $160^{\circ}C$ and $6kg/cm^2$. Experiments were conducted using a $2{\ell}$ batch reactor with varying the concentrations of catalysts. The reaction route of DMN oxidation was considered by measuring the concentration of intermediate species. As the intermediate species, 2-formyl-6-naphthoic acid, 2-methyl-6-naphthoic acid and 2-hydroxymethyl-6-methylnaphthalene are found. It was found that the yield of 2,6-naphthalene dicarboxylic acid(NDA) is largely dependent on the Co and Br concentrations. In addition, it was observed that color-b was closely related with Mn concentration in this experimental range. The burning loss of solvent could be reduced by controlling the concentration of Mn and Br. Addition of small amount of Ce and Cu compounds led to increase the NDA yields and decrease the burning amount of solvent.

• Bulletin of the Korean Chemical Society
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• v.27 no.11
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• pp.1729-1730
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• 2006

• Bulletin of the Korean Chemical Society
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• v.17 no.11
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• pp.1000-1004
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• 1996

A random walk simulation was used to determine the triplet exciton density and annihilation rate for a two dimensional lattice of naphthalene choleic acid with small amount of β-methylnaphthalene (BMN). The results demonstrate that energy transfer efficiency (α) increases as density increases and the annihilation begins to become significant at triplet exciton densities higher then 10-3/sites. Another simulation was carried out to determine annihilation rate and unimolecular decay rate in the absence of BMN. The results indicate that the annihilation rate is equal to the unimolecular decay rate at the density of 1.2×10-3/sites.

• Bulletin of the Korean Chemical Society
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• v.7 no.2
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• pp.120-124
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• 1986

In order to investigate effective solar energy conversion system, the light-induced electron transfer reactions have been examined across single-lamellar liposomes incorporated organic photosensitizers such as anthracene and naphthalene derivatives. We have observed photosensitized reduction of methyl viologen (1,1'-dimethyl-4,4'-$bipyridinium^{2+}$) dissolved in the exterior aqueous phase of the pigmented phospholipid liposomes when EDTA, as electron donor, is dissolved in the enclosed aqueous phase of the liposomes. The anthroyl stearic acid incorporated in the hydrophobic bilayer of liposomes leads to much less quantum yield for the photosensitized reduction of $MV^{2+}$ than the anthracene carboxylate incorporated in the outer hydrophilic layer. However, ${\beta}$-carotene with anthroyl stearic acid incorporated into the bilayer enhances the quantum yield significantly (${\Phi}{\simeq}0.2-0.3$), preventing the reverse reaction of electron transfer ($MV^+_\ {\rightarrow}MV^{2+}$) so that it might be useful for solar energy conversion into chemical energy. A naphthalene derivative, octadecyl naphthylamine sulfonic acid incorporated into the outer layer of liposomes results in less efficiency of $MV^{2+}$ reduction than anthroyl stearic acid. These results have been also tested with respect to lipid components of liposomes.