• 한국환경과학회지
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• 제6권2호
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• pp.173-182
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• 1997

The bacterial strains, which utilizes 2,4,4'-trichloro-2'-hydroxydiphenyl ether(TCHDPE) as a sole carbon source, were isolated by selective enrichment culture from soil samples of industrial waste deposits. The bacterium that showed the highestt biodegradation activity was designated as EL-O47R The isolated strain EL-O47R was Identified as the genus Pseudomonas from the results of morphological, cultural, and biochemical tests. The optimum conditions of medium for the growth and the degradation of TCHDPE were TCHDPE 500 ppm, (NH4)2SO4 0.1% as the nitrogen source, initial pH 7.0±0.1, and 37℃, respectively. In this conditions, the regradation rate of TCHDPE was about 97%. Pseudomonas sp. EL-O47R was tested for resistance to several metal compounds and antibiotics. Pseudomonas sp. EL-O47R was moderately grown to Cd(NO3)2, ZnCl2, AgSO4, CuSO4 and HgCl2. This strain was sensitive to rifampicin and kanamycln but resistant to ampicillin, penicillin, tetracyclin and chloramphenlcol. Pseudomonas sp. EL-O47R was grown structurally related com- pounds and potential metabolites of TCHDPE, and has the stability on TCHDPE biodegradation.

• 한국미생물·생명공학회지
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• 제39권2호
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• pp.161-167
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• 2011

본 연구실에서 확보한 diesel 분해 고효율 균주 Pseudomonas putida KDi 19, kerosene 분해 고효율 균주 P. aeruginosa K14, gasoline 분해 고효율 균주 P. putida G8, BTEX 분해 고효율 균주 P. putida BJ10, P. putida E41의 5개의 고효율 균주를 컬럼 및 반응기에 적용하여 TPH의 생물학적 분해 실험에 적용하였다. 영양염류 및 산소 농도, 균농도 등 최적의 환경인자 도출을 통해 최적의 생물학적 처리 효율을 TPH의 경우, MSM 및 activator I을 주입하여 25일 동안 76.3%의 제거 효율과 제거속도상수 K=0.711를 나타냈으며, diesel의 경우 40일 동안 99.2%의 제거 효율을 보였다. 또한, TPH 오염 토양의 lab-scale bioremediation 실험에서 고효율 균주를 적용한 결과 45일 운전 기간 동안 7,209.9 $mg{\cdot}kg^{-1}$을 825.6 $mg{\cdot}kg^{-1}$까지 88.5% 제거하였다. 본 연구에서 도출된 TPH로 오염된 토양의 bioremediation을 위한 고효율 균주 확보와 최적의 환경 인자 도출은 현재 부족한 생물학적 처리 연구와 물리적 화학적 처리의 문제를 해소하기 위한 기초적 실험 자료로서 기여할 것으로 사료된다.

• 한국미생물·생명공학회지
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• 제24권2호
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• pp.197-205
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• 1996

The $\beta$-xylosidase was purified 99- fold from the culture supernatant of Pseudo onas sp. CB-33 by ammonium sulfate precipitation, PEI precipita- tion, DEAE-Sephadex column chromatography, Sephadex G-75 gel filtration chromatography and preparative disc gel electrophoresis. Molecular weight of the enzyme was estimated to be 44,000 by SDS polyacrylamide gel electrophoresis. The enzyme has a pH optimum for activity at 7.0 and is stable over pH 6.5-9.0. The optimal temperature of the enzyme was 45$\circ$C, and its enzymatic activity was completely inactivated at 55$\circ$C for 30 min. Km value of the enzyme for p-nitrophenyl-$\beta$-D-xylopyranoside was calculated to be 4.6 mM. The effect of various reagents on the $\beta$-xylosidase activity was investigated. The enzyme activity was completely inhibited by Hg$^{2+}$, Cu$^{2+}$ and Zn$^{2+}$. The $\beta$-xylosidase was inactivated by tryptophan-specific reagent, N-bromosuccinimide and tyrosine-specific reagent, iodine. The enzyme could degrade xylo-oligosaccharides to xylose and the enzyme was competitively inhibited by xylose. The $\beta$-xylosidase and endoxylanase from Psedomonas sp. CB-33 hydrolized xylan synergically. The purified enzyme also showed $\alpha$-L-arabinofuranosidase activity.

• 미생물학회지
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• 제35권1호
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• pp.7-12
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• 1999

Pseudomons sp. PY002의 exotoxin A 의 발현 양상을 관찰하기 위하여 P.aeruginosa PAO1의 anti-exotoxin A와 immunoblot hybridization을 실시한 결과 배지내에 유용 가능한 철이 고갈됨에 따라 exotoxin A의 발현양은 점차적으로 증가하는 양상을 보였으며, CAS 배지에 점적한 배양 상층액에서 siderophore의 발현양도 증가함을 보였다. P.sp.PY002 의 genomix library를 제조하여, exotoxin A를 분비하는 2개의 클론을 선별하려 pETA23과 pETA42 로 명명한 후, 반응성이 강한 Peta42를 선발하였다. pETA 42는 약 1.7kb 크기의 insert를 가지며, 양쪽 말단에 cloning site 인 pstI site 가 존재하며 2개의 NcoI, 1개의 PvuII, 1개의 SstI , 3개의 SmaI, 1개의 KpnI, 3개의 HaeII, 1개의 EcoRI site가 존재하였다.

• 약학회지
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• 제41권5호
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• pp.658-665
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• 1997

Identification of a soil microorganism strain X-8, producer of ${\beta}$-lactamase inhibitor, based on its morphological, physiological, biochemical and chemotaxonomical characteristics was performed. The strain X-8 was identified as Pseudomonas sp. The beta-lactamase inhibitor produced by this strain was highly achieved in fermentation medium contained glucose 0.5%, urea 0.25%, $K_2HPO_4{\cdot}3H_2O\;0.5%,\;MgSO_4{\cdot}7H_2O\;0.5%,\;FeSO_4{\cdot}7H_2O\;0.01%,\;CuSO_4,\;ZnSO_4,\;MnSO_4\;0.02%$. The beta-lactamase inhibitor was not extracted by organic solvent such as n-butanol and ethyl acetate but remained in aqueous layer. The n-butanol extract showed antimicrobial activity against M. smegmatis. The ${\beta}$-lactamase inhibitor was stable at pH 7.0~8.0 and 4$^{\circ}C$ for 24h. The ${\beta}$-lactamase inhibitor was bound on ion exchanger Diaion WA-30 and HP-20 and eluted with 2N-$NH_4OH$ and acetone, respectively.

• 미생물학회지
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• 제36권2호
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• pp.155-160
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• 2000

Pseudomonas sp. HJ-2는 heptanoinc acid를 단일탄소원으로 이용하여 3-hydroxybutyrate (3HB),3-hydroxy-velerate (3HV) 및 3-hydroxybutyrate (3HHp)를 구성 단위체로 하는 고무탄성 polyhydroxyalkanoate (PHA)를 생합성한다. 이 미생물 고분자는 poly(3HB-co-3HV)공중합체와 poly(3HHp) 단일중합체로 이루어진 혼합물임이 밝혀졌다. 본 연구에서는 PHA가 고무탄성체로서의 성질을 유지하는데 필용한 단위체 조성과 HJ-2의 배양조건이 PHA의 생산 및 단위체 조성에 미치는 영향에 대하여 조사하였다. 생합성된 PHA의 탄성률은 poly(3HHp)의 존재로 크게 감소되었으나, 3HV의 함량이 높은 poly(3HB-co-3HV) 자체도 최대변형률 740%로서 고무탄성체로서의 성질을 보였다. HJ-2의 생장 및 PHA 생합성은 탄소원인 heptanoic acid의 초기농도가 40mMdlfEo 가장 높았으나, 50mM의 농도에서는 큰 저해를 받았다. PHA 생합성은 질소와 인이 결핍된 조건에서 크게 증가되었다. 배양액의 pH 및 통기는 HJ-2로부터 생합성되는 PHA의 단위체 조성에 큰 영향을 주는 것으로 나타났다. pH 7.5에서 생합성되는 고분자는 poly(3HB-co-38% 3HV)인 반면에 pH8.0에서의 고분자는 3HHp가 95%를 차지하였다. 발효조의 교반속도를 달리한 실험의 결과 고분자 내 3HHp의 함량은 산소전달 속도가 높아질수록 증가하였다.

• Journal of Microbiology and Biotechnology
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• 제9권1호
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• pp.56-61
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• 1999

Pseudomonas sp. SW1 grew and produced biosurfactants on 3% hexadecane as the energy and carbon source. As a result of biosurfactant synthesis, the surface tension of the medium was reduced from 72 dyne/cm to 30 dyne/cm. The properties of biosurfactants that were purified from Pseudomonas sp. SW1 were investigated. The purification procedure included acid precipitation from culture supernatant, silica gel G60 column chromatography, and Sephadex G-150 gel filtration. The biosurfactants were separated into two different types, viz., types I and II. Biosurfactant type Isignificantly reduced the surface tension of water from 72 to 27 dyne/cm at concentration levels above 30 mg/l. The surface tension of water was reduced to a minimum of approximately 30 dyne/cm by biosurfactant type II at concentration levels over 80 mg/l. The biosurfactants were effective in a wide range of pHs, at NaCl concentrations of up to 4%, at $CaCl_2$ concentration up to 100 mM, and at temperatures up to $200^{\circ}C$ for 8 h.

• Journal of Animal Science and Technology
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• 제51권2호
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• pp.171-176
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• 2009

우사주변 경작지 토양으로부터 세포내 파이테이즈 (phytase) 생산능력이 우수한 Fluorescent Pseudomonas sp. BUN1 세균성 균주를 분리, 동정하였다. 그 균주로부터 유래한 BUN1 파이테이즈 (phytase) 효소를 각각 양이온, 음이온 크로마토그래피 기법을 이용하여 부분정제하여 효소적 특성을 규명한 결과, 각각 $40^{\circ}C$와 pH 5.5에서 최적의 효소활성을 나타내었다. BUN1 파이테이즈 (phytase)는 효소의 기질특이성 측면에서 다른 유기인산화합물에 비해 특히 피틴태인 (phytate)의 분해이용성이 매우 우수한 반면, 구리 ($Cu^{2+}$), 카드뮴 ($Cd^{2+}$), 아연 ($Zn^{2+}$)과 같은 금속 2 가이온에 대하여 그 효소활성이 강하게 억제되었다. 또한 BUN1 균주의 효소생산 배지 (PSM) [0.5% sodium phytate, 0.5% $(NH_4)_2SO_4$, 0.5% KCl, 0.01% $MgSO_4{\cdot}7H_2O$, 0.01% $CaCl_2{\cdot}2H_2O$, 0.01% NaCl, 0.001% $FeSO_4{\cdot}7H_2O$, 0.001% $MnSO_4{\cdot}4H_2O$; pH 6.5]에 탄소원으로서 옥수수전분 (corn starch)의 첨가는 조사된 다른 탄소 배지원에 비하여 현저하게 파이테이즈 (phytase) 생산을 촉진시켰다.

• Journal of Microbiology and Biotechnology
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• 제16권7호
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• pp.1068-1077
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• 2006

Pseudomonas sp. PhCN strain, which has the potential to utilize phenol and cyanide as a sole carbon and nitrogen source, was isolated. A comparison of the effect of cyanide on phenol degradation and vice versa by strain PhCN showed that the degradation time was significantly delayed by an increase in either phenol or cyanide concentration, and the greatest activities were obtained in basal medium containing a low concentration of cyanide and phenol. This strain contained two plasmids of approximately 120 kb (pPhCN-1) and 110 kb (pPhCN-2). Plasmid curing experiments produced a plasmid-free strain as well as strains containing either the 120- or the 110 kb plasmid. The strains were tested for their ability to utilize phenol and KCN. The results demonstrated that the ability to utilize phenol was encoded by the 120 kb plasmid, whereas the ability to utilize cyanide appeared to be encoded by the chromosome.

• 한국미생물·생명공학회지
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• 제28권6호
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• pp.322-328
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• 2000

To screen agent for the treat-ment of Alzhimers Disease several strains of bacteria producing acetylcholinesterase inhibitor ware isolated from soil. Strain 960903 showed strong acetylcholinesteras inhibitory activity and low butyrylcholinesterse inhibitory activity. The strain 960903 was identified as Pseudomonas sp. Acetylcholinesterase inhibitor ws highly achieved in fermentation medium containing soluble starch 3.0%, glycerol 1.0%, pharmamedia 0.5%, KCI 0.3%, $CaCO_3$ 0.2%, MgS $O_4$..$7H_2$O 0.05%, $KH_2$$PO_4$ 0.05%(pH6.5) at $30^{\circ}C$ for 4 days. Acetylcholinesterase inhibitor was purified by Diaion WA-30($OH^{-}$) column charomatography and cellulose column chromatography. Acetylcholinesterase inhibi-tor showd the maximum wavelength at 205 nm and was soluble in water, acetic acid, ethanol, methanol and dime-thyl sulfoxide. The concentration of 50% inhibition($IC_{50}$) of inhibitor against acetylcholinesterase was 25$\mu\textrm{g}$/ml. The inhibitor was inactivated on heating ar $100^{\circ}C$ fro 15 min and more stable in acidic region than alkaline region.n.