• Journal of Microbiology and Biotechnology
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• 제30권1호
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• pp.79-84
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• 2020

This study investigated the characterization and functionality of Undaria pinnatifida root (UPT) extracts, degraded using a crude enzyme from Shewanella oneidensis PKA1008. To obtain the optimum degrading conditions, the UPT was mixed with alginate degrading enzymes from S. oneidensis PKA 1008 and was incubated at 30℃ for 0, 3, 6, 12, 24, and 48 h. The alginate degrading ability of these enzymes was then evaluated by measuring the reducing sugar, viscosity, pH and chromaticity. Enzymatic extract at 24 h revealed the highest alginate degrading ability and the lowest pH value. As the incubation time increased, the lightness (L ^⁎) also decreased and was measured at its lowest value, 39.84, at 12 hours. The redness and yellowness increased gradually to 10.27 at 6 h and to 63.95 at 3 h, respectively. Moreover, the alginate oligosaccharides exhibited significant anti-inflammatory activity. These results indicate that a crude enzyme from S. oneidensis PKA 1008 can be used to enhance the polysaccharide degradation of UPT and the alginate oligosaccharides may also enhance the anti-inflammatory effect.

• Fisheries and Aquatic Sciences
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• 제15권2호
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• pp.91-97
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• 2012

To isolate a nonylphenol (NP)-degrading bacterium, we isolated a single colony from the NP-degrading microbial consortium SW-3, which was previously isolated from an aqueous environment. Ten colonies that exhibited different cell morphologies were isolated and the strains were named SW-3-A, -B, -C, -D, -E, -F1, -F2, -G, -H, and -I. The ability of isolates to degrade NP was evaluated by kinetic analysis by the constant of NP degradation rate ($k_1$) and the half-life time of NP degradation ($t_{1/2}$). SW-3-F1, -F2, -G, and -I strains were superior at degrading NP. The $k_1$ and $t_{1/2}$ values of the four strains were sixfold higher and one-sixth lower, respectively, than those of the consortium strain. Additionally, SW-3-F1, -G, and -I strains were tested for their ability to degrade NP during coculture. NP degradation by coculture with a combination of all three strains was inferior to that of culture conducted with single isolates, suggesting that the three strains are antagonistic toward each other during NP degradation.

• Journal of Microbiology and Biotechnology
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• 제7권1호
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• pp.43-48
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• 1997

Three strains capable of degrading a chlorophenol were isolated by selective enrichment from soils contaminated with industrial wastewater. A Pseudomonas solanacearum TCP114 could use 2,4,6-trichlorophenol (TCP) as sole carbon and energy source, while two strains of Pseudomonas testosteroni CPW301 and Arthrobacter ureafaciens CPR706 could use 4-CP. All isolates also grew well on phenol. The degradation of one component by a pure strain was strongly affected by the presence of other compounds in the medium, CPW301 and CPR706 entirely lost the ability to degrade 4-CP and phenol in the presence of TCP. TCP114 also lost the ability to degrade phenol when 4-CP was added to the culture medium. These restrictions on the degradability could be overcome by employing defined mixed cultures (TCP114 and one strain of 4-CP degrading strains). All three components were successfully degraded by defined mixed cultures through their cooperative activities. It was also demonstrated that defined mixed cultures could be immobilized by using calcium alginate for the semi-continuous degradation of the three component mixture. Immobilization could not only accelerate the degradation rate, but also allowed the reuse of the cell mass several times without loss of the cells' degrading capabilities.

• Journal of Microbiology and Biotechnology
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• 제22권1호
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• pp.92-99
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• 2012

The optimal physical factors affecting enzyme production in an airlift fermenter have not been studied so far. Therefore, the physical parameters such as aeration rate, pH, and temperature affecting PLA-degrading enzyme production by Actinomadura keratinilytica strain T16-1 in a 3 l airlift fermenter were investigated. The response surface methodology (RSM) was used to optimize PLA-degrading enzyme production by implementing the central composite design. The optimal conditions for higher production of PLA-degrading enzyme were aeration rate of 0.43 vvm, pH of 6.85, and temperature at $46^{\circ}C$. Under these conditions, the model predicted a PLA-degrading activity of 254 U/ml. Verification of the optimization showed that PLA-degrading enzyme production of 257 U/ml was observed after 3 days cultivation under the optimal conditions in a 3 l airlift fermenter. The production under the optimized condition in the airlift fermenter was higher than un-optimized condition by 1.7 folds and 12 folds with un-optimized medium or condition in shake flasks. This is the first report on the optimization of environmental conditions for improvement of PLA-degrading enzyme production in a 3 l airlift fermenter by using a statistical analysis method. Moreover, the crude PLA-degrading enzyme could be adsorbed to the substrate and degraded PLA powder to produce lactic acid as degradation products. Therefore, this incident indicates that PLA-degrading enzyme produced by Actinomadura keratinilytica NBRC 104111 strain T16-1 has a potential to degrade PLA to lactic acid as a monomer and can be used for the recycle of PLA polymer.

• 생명과학회지
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• 제12권4호
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• pp.392-398
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• 2002

Lignocellulose 분해 이용을 위해 토양 등에서 lignin분해 능력이 우수한 세균을 분리 및 동정함으로서 방향족 화합물의 이용을 위한 생물전환의 기초를 확보하고자하였다. 토양 등의 시료로부터 38주의 리그닌 분해 균주를 분리하였다. 분리된 LG2를 공시 균주로 선정하여 형태학적, 배양학적 및 생리학적 특성을 조사한 결과 Pseudomonas sp. LG2로 명명하였다. 이 균주는 리그닌을 분해 할 수 있었으며, 리그닌 함유 배지에 배양하여 배양 분해 산물을 HPLC로 분석한 결과 다수의 방향족 화합물을 생산하였다 Poylacrylamide gel활성 분석에 의해서 3종류로 구성된 peroxidase가 조사되었다.

• 한국미생물생명공학회:학술대회논문집
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• 한국미생물생명공학회 2001년도 Proceedings of 2001 International Symposium
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• pp.116-117
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• 2001

A thermotolerant bacterium, designated as PHS1, was isolated from a hot spring in Pohang, Korea, on the basis of its ability to grow on BTEX as a sole carbon source. We cloned and sequenced the entire BTEX-degrading pathway genes of PHS1 and found that two multicomponent mono-oxygenases together with meta-pathway genes are responsible for the BTEX biodegradation.

• Journal of Microbiology and Biotechnology
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• 제11권1호
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• pp.56-60
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• 2001

A kerosene fungus of Cladosporium resinae NK-1 was examined for its ability to degrade individual n-alkanes and aromatic hydrocarbons by gas chromatography-mass spectrometry, and its organic solvent-tolerance was investigated by making use of the water-organic solvent suspension culture method. It grew on a wide range of solvents of varying hydrophobicities and it was found to have tolerance to various kinds of toxic organic solvents (10%, v/v) such as n-alkanes, cyclohexane, xylene, styrene, and toluene. A hydrocarbon degradation experiment indicated that NK-1 had a greater n-alkane degrading ability compared to that of the other selected strains. C. resinae NK-1, which could utilize 8-16 carbon chain-length n-alkanes of medium chain-length as a carbon source, could not assimilate the shorter chain-length n-alkanes and aromatic hydrocarbons tested so far. The n-alkane degrading enzyme activity was found in the mycelial extract of the organism.

• 미생물학회지
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• 제24권4호
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• pp.389-393
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• 1986

염소계 방향족 탄화수로를 분해하는 다수의 세균을 토양과 하천 포품으로부터 분리하여 동정하였다. 이들중 2-메틸-4-클로로페녹시 아세트산을 강력하게 분해하고, 또한 플라스미드를 갖고 있는 7군주의 Pseudomonas sp.를 선별하였다. 2-메틸-4-클로로페녹시 아세트산의 분해 유전자가 플라스미드에 기인함을 전기영동과 큐어링 실험에 의해서 확이하였다. 항생물질에 대한 내성과 다른 제초제에 대한 분해능도 아울러 조사하였다.

• 한국어병학회지
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• 제5권2호
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• pp.153-158
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• 1992

남해안에 위치한 원유저장기지내의 각 정점으로 부터 원유분해세균을 분리하여 동정한 결과 Pseudomonas fluorescens, Acinetobacter baumanii, Pseudomonas maltophila, Pseudomonas aeruginosa 등으로 동정되었다. 원유를 탄소원으로 첨가한 최소배지상에서 원유분해능을 나타내었으며, 0.5%에서 6%까지의 NaCl 농도변화에 대한 원유분해능을 비교한 결과 5종의 원유분해균이 NaCl의 농도가 증가하였을 경우에는 원유분해능이 상실됨을 확인하였다. 또한 원유는 복잡한 유기화합물로 구성이 되어 있어 분리된 원유분해균이 n-decane, n-hexane, n-octane, n-dodecane 등의 간단한 탄화수소를 자화하는지를 확인하였다. 분리된 원유분해균이 plasmid를 가지는 지를 확인한 결과 Pseudomonas fluorescens 및 Pseudomonas aeruginosa 등에서 분자량이 매우 큰 plasmid가 존재함을 확인하고 ampicillin, tetracycline 및 chloramphenicol등의 항생제에 대한 내성을 조사한 결과 내성을 나타내어 원유분해에 관련된 유전자와 항생제내성을 나타내는 유전자가 plasmid상에 존재할 가능성이 높음을 알수 있다.

• 미생물학회지
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• 제27권3호
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• pp.279-284
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• 1989

부산시내 주택단지의 하수나 토양에서 LAS 분해능이 우수한 균주를 유일한 탄소원으로서 sodium dodecylbenzenesulfonate(SOBS, soft type)를 포함하는 agar plate를 사용하여 분리히였다 이들 분리균중 2균주가. SOBS를 0.1% 함유한 완전배지에서 30$^{\circ}$C 24시간 배양했을 때' SOBS분해율이 최고 59% 정도까지 냐타내였다 긍속이온에 대한 이들 분리 균의 내성조사결과 대부분 $CdCl^{2}$,와 $ZnCl^{2}$에 비교적 내성이 큰 것으로 나타났으며 분리균의 항생제 내성시험에서는 ampicillin 에 대하여 내성을 나타내었다. 특히 분리균중 1개는 ampicillin에 대해 1,550mg/ml 이상에서도 내성을 나타내었으며 이 분리균주는 Klebsiella 속으로 동정되었다. 이 균주는 5kb와 4kb의 2개의 plasmid를 가지고 있었으며 이들은 E. coli C600 plasmic 균주에 형질전환시켰을 때 SDBS분해능을 나타내었으므로 SDBS분해능은 plasmid에 존재하는 유전인자에 의한 것임을 알 수 있었다.