• Title, Summary, Keyword: Pseudomonas sp

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Improvement of 4-chlorobiphenyl degradation bya recombinant strain, pseudomonas sp. DJ12-C

  • Kim, Ji-Young;Kim, Young-Chang;You, Lim-Jai;Lee, Ki-Sung;Ok, Ka-Jong;Hee, Min-Kyung;Kim, Chi-Kyung
    • Journal of Microbiology
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    • v.35 no.1
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    • pp.53-60
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    • 1997
  • Pseudomonas sp. P20 and Pseudomonas sp. DJ-12 isolated from the polluted environment are capable of degrading biphenyl and 4-chlorobiphenyl (4CB) to produce benzoic acid and 4-chlorobenzoic acid (4CBA) respectively, by pcbABCD-encoded enzymes. 4CBA can be further degraded by Pseudomonas sp. DJ-12, but not by Pseudomonas sp P20. However, the meta-cleavage activities of 2, 3-dihydroxybiphenyl (2, 3-DHBP) and 4-chloro-2, 3-DHBP dioxygenases (2, 3-DHBD) encoded by pcbC in Pseudomonas sp. P20 were stronger than Pseudomonas sp. DJ-12. In this study, the pcbC gene encoding 2, 3-DHBD was cloned from the genomic DNA of Pseudomonas sp. P20 by using pKT230. A hybrid plasmid pKK1 was constructed and E. coli KK1 transformant was selected by transforming the pKK1 hybrid plasmid carrying pcbC into E. coli XL1-Blue. By transferring the pKK1 plasmide of E. coli KK1 into Pseudomonas sp. DJ-12 by conjugation, a recombinant strain Pseudomonas sp. P20, Pseudomonas sp. DJ-12, and the recombinant cell assay methods. Pseudomonas sp. DJ12-C readily degraded 4CB and 2, 3-DHBP to produce 2-hydroxy-6-oxo-6-phenylhexa-2, 4-dienoic acid (HOPDA), and the resulting 4CBA and benzoic acid were continuously catabolized. Pseudomonas sp. DJ12-C degraded 1 mM 4CB completely after incubation for 20 h, but Pseudomonas sp. P20 and Pseudomonas sp. DJ-12 showed only 90% and Pseudomonas sp. DJ-12 had, but its degradation activity to 2, 3-DHBP, 3-methylcatechol, and catechol was improved.

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Biological Control of Soybean Anthracnose by Pseudomonas sp. (Pseudomonas sp.를 이용한 콩 탄저병의 생물학적 방제)

  • Oh, Jeung-Haing;Kim, Kyu-Hong
    • Research in Plant Disease
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    • v.9 no.3
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    • pp.174-178
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    • 2003
  • Pseudomonas sp. antagonistic to Colletotrichum truncatum and C. gloesporioies was selected as a biological control agent for soybean anthracnose. Pseudomonas sp. inhibited the mycelial growth of pathogens effectively as the funhicides such as benomyl and fluazinam in vitro tests without any adverse effects on soybean. Seed treatment with Pseudomonas sp. increased emergence rate of soybean seeds significantly after inoculaton with C. truncatum. When the suspension of Pseudomonas sp. was sprayed on soybean plants, the control efficacy was not different from that of fungicides, benomyl and fluazinam two weeks after treatment, however the efficacy did not last long enough after three weeks.

Effects of Virious Plant Growth Promoting Rhizobacteria on the Growth of Hydroponically Grown Cucumber Plants in Rockwool and Cocopeat Culture (수종의 식물생장촉진 근권세균이 암면과 코코피트경 오이의 생장에 미치는 영향)

  • Cho, Ja-Yong;Chi, Yeon-Tae;Chung, Soon-Ju
    • Korean Journal of Organic Agriculture
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    • v.7 no.1
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    • pp.105-113
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    • 1998
  • This study was conducted to clarify the effects of various rhizobacteria in the root zone in terms of Azospirillum sp., Rhodopseudomonas sp., Pseudomonas sp., fusant of Bacillus sp. and Corynebacterium glutamicum on the growth of hydroponically grown cucumber plants. Densities in bacterial cells of fusant of Bacillus sp. and Corynebacterium glutamicum at different substrates were in the order of cocopeat > rockwool > nutrient solutions at 4 days after bacterialization. Plant growth promoting effects of the various rhizobacteria on the growth of hydroponically grown cucumber plants were in the order of Azospirillum sp. > Rhodopseudomonas sp. $\ge$ fusant of Bacillus sp. and Corynebacterium glutamicum > Pseudomonas sp. > control.

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Characteristics of the symbionts Pseudomonas sp. J2W strain and Xanthomonas sp. J2Y strain which utilize polyvinyl alcohol (Polyvinyl alcohol 이용 공생균 Pseudomonas sp. J2W와 Xanthomonas sp. J2Y의 특성)

  • Jo, Youn-Lae
    • Applied Biological Chemistry
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    • v.35 no.1
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    • pp.30-35
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    • 1992
  • Two strains J2W and J2Y which were isolated from soil can utilize polyvinyl alcohol(PVA) as a sole carbon source. PVA was utilized symbiotically by the mixed culture of these two strains which could not utilize PVA in each respective pure culture. Effect of degree of PVA polymerization on the its utilization was examed, and there was remarkable difference among three kind of PVA(PVA 500, 1500 and 2000). The reconstruction of there two strains was carried out with other symbionts Pseudomonas sp. PW and Pseudomonas sp. G5Y which were able to utilize PVA. PVA utilization occured in each remixed culture of J2Y strain with Pseudomonas sp. PW J2W strain with Pseudomonas sp. G5Y, respectively. Identification of bacteria was based on morphological and biological chatacteristics, J2W and J2Y strain were similar to a strain of Pseudomonas pseudimallei and Xanthomonas campestris, respectively.

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Characteristics of Biosurfactant Producing Pseudomonas sp. G314 (생물 계면활성제를 생산하는 Pseudomonas sp. G314의 특성)

  • Shim, So-Hee;Park, Kyeong-Ryang
    • Korean Journal of Microbiology
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    • v.42 no.4
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    • pp.286-293
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    • 2006
  • Three hundred thirty two bacterial colonies which were able to degrade crude oil were isolated from soil samples that were contaminated with oil in Daejon area. Among them, one bacterial strain was selected for this study based on its low surface tension ability, and this selected bacterial strain was identified as Pseudomonas sp. G314 through physiological-biochemical tests and analysis of its 16S rRNA sequence. Pseudomonas sp. G314 showed a high resistance to antibiotics such as ampicillin, chloramphenicol, spectinomycin, and streptomycin, and heavy metals such as Li, Cr, and Mn. It was found that the optimal pH and temperature for biosurfactant production of Pseudomonas sp. G314 were pH 7.0 and $30^{\circ}C$, respectively. After seven hours of inoculated, the biosurfactant activity reached the maximum, and surface tension of the culture broth was decreased from 72 to 25 dyne/cm. The crude biosurfactant was obtained from the culture broth by acid precipitation, followed by solvent extraction, evaporation and then freeze drying. The CMC (critical micelle concentration) value of the crude biosurfactant was 20 mg/L.

Isolation and Characteristics of Polyhydroxyalkanoates Producing Pseudomonas sp. MBEL21 (신규 Pseudomonas sp. MBEL21 균주의 Polyhydroxyalkanoates 생산 특성)

  • 최종일;이승환;이상엽
    • Microbiology and Biotechnology Letters
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    • v.32 no.2
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    • pp.123-127
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    • 2004
  • Pseudomonas sp. MBEL21 was newly isolated from soil samples and found to accumulate medium-chain-length Polyhydroxyalkanoates(MCL-PHAs) using oleic acid as a sole carbon source. Among the various nutrient limiting conditions examined, including nitrogen, sulfur and phosphorus, only phosphorus limitation supported the accumulation of MCL-PHAs up to 15 wt% of dry cell weight in flask cultures. MCL-PHAs produced by Pseudomonas sp. MBEL21 was mainly composed of 3-hydroxy-5-cis-tetradecenoate. Fed-batch culture of Pseudomonas sp. MBEL21 by novel feeding strategies based on cell growth charcteristics was carried out under phosphorus limitation using oleic acid as a sole carbon source. The final cell concentration and PHA content of 82 g/L and 28 wt%, respectively, were obtained. Furthermore, PHA consisted of MCL-hydroxyalkanoates and 3-hydroxybutyrate could be produced using olive oil as a sole carbon source.

Dechlorination of 4-Chlorobenzoate by Pseudomonas sp. DJ-12

  • Chae, Jong-Chan;Kim, Chi-Kyung
    • Journal of Microbiology
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    • v.35 no.4
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    • pp.290-294
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    • 1997
  • 4-Chlorobiphenyl-degrading Pseudomonas sp. DJ-12 was able to degrade 4-chlorobenzoate(4CBA), 4-iodobenzoate, and 4-bromobenzoate completely under aerobic conditions. During. the degradation of 4CBA by Pseudomonas sp. DJ-12, chloride ions were released by dechlorination and 4-hydroxybenzoate was produced as an intermediate metabolite. The NotI-KNA fragments of pKC157 containing dechlorination genes hybridized with the gene encoding 4CBA:CoA dehalogenase of Pseudomonas sp. CBS3 which is responsible for the hydrolytic dechlorination of 4CBA. These results imply that Pseudomonas sp. DJ-12 degrades 4CBA to 40hydroxybenzoate via dechlorination as the initial step of its degradativ pathway. The genes responsible for dechlorination of 4CBA were found to be blcated on the chromosomal DNA of Pseudomonas sp. DJ-12.

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Isolation and Nitrate Reduction Characteristics of Aerobic Denitrifier Pseudomonas sp. DN-9 (호기성 탈질균 Pseudomonas sp. DN-9의 분리 및 질산염 환원 특성)

  • Cho Sun-Ja;Jung Yong-Ju;Lee Sang-Joon
    • Journal of Environmental Science International
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    • v.14 no.10
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    • pp.955-963
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    • 2005
  • From sludge of S municipal wastewater treatment plant in Busan, Korea, we isolated the denitrifier DN-9 which showed the ability of denitrification under aerobic conditionby the color change and gas formation in liquid culture with Giltay medium. The isolated strain was identified as Pseudomonas sp. DN-9 on the basis of the morphological, physiological, biochemical and nucleotide sequence analysis of l6S rRNA. The isolated strain, Pseudomonas sp. DN-9, has cytochrome $cd_1$, nirS of nitrite reductase. By the co-existance of additional ammonium and nitrate ion, the strain was not affected largely on growth in SL series broth. It seemed the result of denitrification. Although Pseudomonas sp. DN-9 has a good nitrate reduction activity under aerobic condition, the activity is less than Pseudomonas stutzeri in same cultivation condition. However, Escherichia coli had little the activity of aerobic denitrification and Pseudomonas putida showed lower activity of aerobic denitrification than Pseudomonas sp. DN-9 and Pseudomonas stutzeri in this study.

Production of Eicosapentaenoic Acid by Pseudomonas sp. CH-414 (Pseudomonas sp. CH-414에 의한 Eicosapentaenoic Acid 생산)

  • 김창호;홍억기;신원철
    • Microbiology and Biotechnology Letters
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    • v.23 no.5
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    • pp.531-535
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    • 1995
  • The identification of eicosapentaenoic acid (EPA) by Pseudomonas sp. CH-414 were investigated under the optimal culture conditions. The maximum dry cell weight and phospholipid production showed about 10 mg/ml and 0.6 mg/ml, respectively, at the 48 hr cultivation. The phospholipid form produced by Pseudomonas sp. CH-414 was elucidated as a phosphatidyt ethanolamine by thin layer chromatography. EPA was contained about 15% in the. extractable lipid, and the amount of EPA was about 83 $\mu $g/ml from the culture broth. Also myristic, palmitic, palmitoleic, stearic and oleic acids were identified with gas chromatography.

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Biodegradiation of Benzoate by Pseudomonas sp. (Pseudomonas sp.에 의한Benzoate의 생분해)

  • 김교창;정준영
    • Journal of Food Hygiene and Safety
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    • v.11 no.3
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    • pp.165-170
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    • 1996
  • The biodegradation of high concentration of benzoate by enrichment culture with Pseudomonas sp. was investigated. During 50 days continuous culture, average of removal rate of benzoate and COD were 90% and 83%, respectively. And the enzymatic activity of catechol 2,3-dioxygenase was determined in the continuous culture but not Catechol 1,2-dioxygenase. On the other hand, Pseudomonas sp in the culture was investigated with SEM and the result was revealed that the cell shape was more demage according concentration of benzoate.

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