• YAKHAK HOEJI
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• v.31 no.2
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• pp.52-59
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• 1987

The result of the screening of lectins on 28 species of marine shell fishes(mollusks) showed that 10 species (Tapes philippinarum, Cyclosunetta menstrualis, Neptunea arthritica cumingii, Omphalius pfeifferi carpenteri, Chlorostoma argyrostoma turbinatum, Chiorostoma argyrostoma lischkei, Semisulcosira corea, Neptunea polycosta, Babylonica japonica, Noverita didyma) were present hemagglutinating properties to human A, B, and O group, and animal blood erythrocytes. A new lectin from Tapes philippinarum. was isolated and partially characterized. The lectin was purified by (NH$_4$)$_2$SO$_4$ precipitation and ion exchange chromatography on DE 53 column. Six fractions were obtained from DE 53 column by salt gradient elution but only 0.3M, and 0.4M NaCl fraction had strong lectin activity. On its 0.3M NaCl fraction, purity was identified by polyacrylamide gel electrophoresis. This lectin was inhibited by N-acetyl-D-galactosamine. It seems that two kinds of lectin react as antigen by immunochemical studies.

• Journal of Applied Biological Chemistry
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• v.48 no.2
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• pp.75-78
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• 2005

Halotolerant protease produced by Halomonas marisflava KCCM 10457 was partially purified through ammonium sulfate precipitation and Sephacryl S-200HR gel permeation chromatography. Optimal pH and temperature of protease were 11.0 and $45^{\circ}C$, respectively. Enzyme activity was inhibited by $Cu^{2+}$, $Hg^{2+}$, $Fe^{2+}$, and $Fe^{3+}$, and selectively inhibited by p-chloromercuribenzoic acid (PCMB), suggesting this enzyme is cysteine protease. The enzyme is halotolerant, because it retained 77% of original activity in presence of 3.33 M NaCl. The protease showed broad substrate specificity to various natural proteins; BSA, casein, egg albumin, gelatin, and hemoglobin.

• Korean Journal of Microbiology
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• v.14 no.3
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• pp.135-145
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• 1976

Confluent AGMK cells were infected by large plaque SV40 virus. Levels of DNA polymeras $({\alpha}\;and\;{\beta})$ were measured in the cytoplasm and the cell nucleus. The activities of DNA $polymerase-{\alpha}$ which found in both the cell nucleus and the cytoplasm were increased approximately eight folds at 48 hours after infection of SV40 virus. Only insignificant but constant amounts of DNA $polymerase-{\beta}$ were found either in the nucleus of the SV40 infected cell or of the uninfected cell. The characteristics of the SV40 virus induced DNA polymerases were compared with that of the uninfected cellular DNA polymerase in regard of the effects of pH, salt concentration, NEM concentration and temperature on those enzyme activities. No differential effect was found between both enzymes. Endouclease activities wre examined in the purified DNA $polymerase-{\alpha}\;and\;{\beta}$. The low level of endonuclease activity which might cut SV40 DNA 1 at one site was observed in the DNA $polymerase-{\alpha}$ whereas high but nonspecific endonuclease activities were found in the DNA $polymerase-{\beta}$.

• YAKHAK HOEJI
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• v.38 no.4
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• pp.418-424
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• 1994

Lectin from mistletoe (Viscum coloratum) were obtained by salt fractionation, gel filtration and anion exchange chromatography. A molecular weight of about 60,000D has been determined by SDS-PAGE and two basic subunits which have molecular weights of 33,000D and 28,000D are linked by a disulfide bond. The partially purified mistletoe lectins agglutinated human B erythrocytes. Agglutinating activity was relatively stable at varied pH $(3.77{\sim}8.71)$ and at temperature range of $0{\sim}40^{\circ}C$ and not affected by 9 metal ions. Galactose, lactose and N-acetyl-D- galactosamine inhibited agglutinating activity of lectin. Lectin from mistletoe was more mitogenic to murine lymphocytes than concanavalin A.

• The Korean Journal of Food And Nutrition
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• v.12 no.3
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• pp.240-245
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• 1999

The purpose of this study was to develop the new microbial bioflocculant available in a food and fer-mentation industal. This study was reported the results of the composition for optimum culture medium and elemental characteristic of crude purification bioflocculant following the previous report(I). The maximum production of the flocculant from Bacillus megaterium was observated in the culture medium containing 2% sucrose 0.3% NaNO3 0.01% tryptone 0.01% beef extract 0.05% MgSO4 ·7 H2O 0.005% CaCO3 Addition of the sucrose as carbon sources and inorganic salt such as MgSO4, CaCO3 significantly increased the production of flocculant more than nitrogen sources. In the result of color reaction of the crude purified bioflocculant it was investgated that anthrone was positive and benedict burette and nin-hydrin was negative. These result were indicated that the flocculant produced from Bacillus megaterium was a kind of exopolysaccharide.

• YAKHAK HOEJI
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• v.53 no.3
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• pp.114-118
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• 2009

Bioemulsifiers are those chemicals which are produced from microorganisms but which have both hydrophilic and hydrophobic groups. $\alpha$-Glucosidase inhibitor ($\alpha$-GI) produced from Bacillus lentimorbus B-6 (B-6) showed bioemulsifying activity. But $\beta$-glucosidase inhibitor produced from B-6 didn't show emulsifying activity. $\alpha$-GI was purified from supernatant of B-6 grown in minimal culture medium containing glucose and sodium glutamate by Sephadex G-100 column chromatography and isolated from $\beta$-GI by dialysis against water. Toluene was determined as the best substrate for emulsifying activity of $\alpha$-GI. $\alpha$-GI showed thermostability at $100^{\circ}C$ for 15 min, high salt tolerance up to 32% NaCl and wide range of pH-stability at pH $4\sim10$. Emulsifying character of $\alpha$-GI can be useful for the liposome formation for the treatment of diabetes mellitus.

• YAKHAK HOEJI
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• v.35 no.5
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• pp.444-455
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• 1991

Two kinds of new lectin fractions (LOA-I, LOA-II) were obtained from loach (Misgurnus spp.) meat by 0.15 M NaCl extraction, salt fractionation, ion exchange and hydroxyapatite column chromatographies. On polyacrylamide gel electrophoresis, LOA-I exhibited one major and a few minor bands, but LOA-II exhibited three minor bands. The partially purified loach lectins agglutinated not only erythrocytes of human B and AB type, rabbit, dog, but also murine splenic lymphocytes. Agglutinability was relatively labile at various pH and stable at increasing temperature, but was not affected by tested several metal ions. By the sugar specificity test, D-glucosamine and metyl-$\beta$-galactopyranose inhibited agglutinating activity at a final concentration of 3 mM. The lectins contained relatively high amounts of aspartic acid, valine and leucine, but sulfur containing amino acids, cystein, methionine and isoleucine were not determined. LOA-I, LOA-II lectins were nonmitogenic toward murine lymphocytes.

• Journal of Surface Science and Engineering
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• v.19 no.1
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• pp.13-19
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• 1986

Manganese in the Anode slime and the paste-positive material of waste-dry cell was recovered by leaching with the hydrochloric acid solution. The impurities (Zn, Fe, Pb), co-leached with manganese were removed from the leached solution prior to electrolysis by hydrometallurgical techniques such as the neutralization with ammonium hydroxide and cementation on manganese powder. The electrodeposition of manganese from the purified chloride solution with sodium selenate was performed. Cathode current efficiency was found to be affected significantly by the concentration of sodium selenate and ammonium chloride salt, bath temperate, current density and PH. The current efficiency of about 88.7% was obtained by electrolysis manganese chloride solution with sodium selenate (0.1/g) at 10$^{\circ}C$.

• Journal of the Korean Society of Food Science and Nutrition
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• v.19 no.3
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• pp.263-269
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• 1990

Aqueous solution pigment produced by Steptomyces californicus KS-89 showed a vivid bluish purple pigment and purified by silica gel column chromatography. The pigment indicated a deep purple color zone by the C. I. E chromatic diagram and showed UV absorption maxima at 575nm. The color intensity in aqueous solution was fairly stable in the ranges of pH5-8 and was not affected by UV light however sometimes it had faded slightly by the heat. It was possible to prevent significantly by the addition of metal salt. Especially this pigment has no mutagenicity and antitumor activity and it appears to be devoid of antibiotic activity.

• Bulletin of the Korean Chemical Society
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• v.21 no.1
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• pp.61-64
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• 2000

FT-IR/ATR analysis shows that the oriental lacquer coating network degrades mostly in the unsaturated side chain. The rate of increase in carbonyl intensity (a measure of photodegradation) during the accelerated weathering test was substantially different for the unstabilized and stabilized samples; adding 2 wt% HALS into the oriental lacquer formulation enhanced photostabilization up to three times. Weight loss measurements, another indication of photodegradation, and SEM analysis support this conclusion. Despite the presence of the photo-stabilizer, the other properties of the lacquer were not significantly affected. In particular, the curing behavior of purified lacquer (PL) and HALS-stabilized samples is similar, although the in-situ DETA analysis showed that addition of HALS can slightly retard the cure reaction rate in oriental lacquer coating. It is hypothesized that this cure retardation may be related to the salt formation between HALS and acid of oriental lacquer.