• Title/Summary/Keyword: Microbe

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Statistical Analysis of Sewage Plant Operation (하수처리장 운전조건의 통계분석)

  • 이찬형;문경숙
    • Journal of Environmental Science International
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    • v.11 no.1
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    • pp.63-68
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    • 2002
  • In this study, we examined statistical analysis between sewage plant operations parameters and effluent quality We got six components from principle component analysis of the operation parameters and secondary effluent quality. 91.8% of the total variance was explained by the six components. The components were identified in the following order : 1) organic matter removal by aeration basin microbe, 2) settleability on secondary clarifier load, 3) removal of nutrients, 4) microbial number increasement and species diversity, 5) microbial activity in aeration basin, 6) oxidation in aeration basin.

Pathogenic Factors of Porphyromon as endodontalis.

  • Kon, A.;Nemoto, Y.Ohara;Kubota, M.;Kimura, S.
    • Proceedings of the KACD Conference
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    • 2001.11a
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    • pp.564.1-564
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    • 2001
  • Porphyromon as endodontalis, a gram-negative anaerobic rod, is an important pathogenic organism in periapical lesionis with acute symptoms, such as pain, swelling, and suppuration in endodontic patient. Like P. gingivalis, a major pathogen of adult periodontitis, P. endodontalis is asaccharolytic and forms black-pigmented colonies on enriched blood agar plates. However, the pathogenic factors and the pathological potential of this microbe have been poorly characterized.(omitted)

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Genes Involved in Symbiotic Nitrogen Fixation (질소고정 공생관계 관련 유전자)

  • 안정선
    • Proceedings of the Botanical Society of Korea Conference
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    • 1987.07a
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    • pp.81-101
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    • 1987
  • In an attempt to revies the informations about genes involved in symbiotic nitrogen fixation, developmental processes in which host plant interact with microbe during nodule formation were introduced first. The structure, function and regulation of the genes discussed were mainly about microbial genes; those involved in the process of nodule formation (nod-genes) and of nitrogen fixation (nif-genes). Informations about the host genes involved in the symbiosis were discussed briefly.

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Microbial etiology of endodontic treatment failure

  • Kum, Kee-Yeon
    • Proceedings of the KACD Conference
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    • 2003.11a
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    • pp.606-606
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    • 2003
  • There have been many studies that have evaluated success and failure of endodontic treatment (Nair, Sjogren), but there is remarkably limited information concerning the specific microorganisms that are involved in the teeth with treatment failure. Microorganisms that survive root canal treatment to cause a persistent infection must possess specific characteristics to avoid the host defense. These can be broadly classified as; 1. Sequestration:A physical barrier between the microbe and the host. 2. Cellular evasion:Microorganisms avoid leukocyte dependent antibacterial mechanisms. 3. Humoral evasion:Extracellular bacteria avoid the hosts antibodies and complement.(omitted)

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Quantitative Determination of Fe-oxidation State by Electron Energy Loss Spectroscopy (EELS) (전자에너지 손실분광 분석법을 이용한 정량적 철산화수 측정)

  • Yang, Ki-Ho;Kim, Jin-Wook
    • Economic and Environmental Geology
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    • v.45 no.2
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    • pp.189-194
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    • 2012
  • The consequences of microbe-mineral interaction often resulted in the chemical, structural modification, or both in the biologically induced mineral. It is inevitable to utilize the high powered resolution of electron microscopy to investigate the mechanism of biogenic mineral transformation at nano-scale. The applications of transmission electron microscopy (TEM) capable of electron energy loss spectroscopy (EELS) to the study of microbe-mineral interaction were demonstrated for two examples: 1) biogenic illite formation associated with structural Fe(III) reduction in nontronite by Fereducing bacteria; 2) siderite phase formation induced by microbial Fe(III) reduction in magnetite. In particular, quantification of the changes in Fe-oxidation state at nanoscale is essential to understand the dynamic modification of minerals resulted from microbial Fe reduction. The procedure of EELS acquisition and advantages of EELS techniques were discussed.

Differential Induction of PepTLP Expression via Complex Regulatory System against Fungal Infection, Wound, and Jasmonic Acid Treatment during Pre-and Post-Ripening of Nonclimacteric Pepper Fruit

  • Jeon, Woong-Bae;Kim, Kwang-Sang;Lee, Hyun-Hwa;Cheong, Soo-Jin;Cho, Song-Mi;Kim, Sun-Min;Pyo, Byoung-Sik;Kim, Ynung-Soon;Oh, Boung-Jun
    • The Plant Pathology Journal
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    • v.20 no.4
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    • pp.258-263
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    • 2004
  • Ripe fruit of pepper (Capsicum annuum) showed resistance to Colletotrichum gloeoporioides, but unripe fruit was susceptible. We previously isolated the PepTLP gene that induced in both unripe and ripe fruit by fungal infection and wound, and only in ripe fruit by jasmonic acid (JA) treatment. To examine further regulation of PepTLP, the action of specific agonist and antagonists of known signaling effector on the .PepTLP expression by fungal infection, wound, and JA was investigated. A similar dephosphorylation event negatively activated all the PepTLP expression in the ripe fruit by fungal infection, wound, and JA. The induction of PepTLP expression by wound is differentially regulated via phosphorylation and dephosphorylation step during pre- and post-ripening, respectively. In addition, the induction of PepTLP expression in the ripe fruit by wound and JA is differentially regulated via dephosphorylation and phosphorylation step, respectively. Only both wound and JA treatment has synergistic effect on the PepTLP expression in the unripe fruit. Both SA and JA treatments on the unripe fruit, and both wound or JA and SA on the ripe fruit could not do any effect on the expression of PepTLP. These results suggest that the induction of PepTLP expression is differentially regulated via complex regulatory system against fungal infection, wound, and JA treatment during pre- and post-ripening of pepper fruit.