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RISS 인기검색어
- 검색키워드
- 주제어 : Sphaerotilus natans (검색결과 4 건)
- 무료
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Park, Sunhwa,Kim, Dong-Hun,Lee, Ji-Hoon,Hur, Hor-Gil BlackWell Publishing Ltd 2014 FEMS microbiology ecology Vol.90 No.1
<P>Ferrous iron has been known to function as an electron source for iron-oxidizing microorganisms in both anoxic and oxic environments. A diversity of bacteria has been known to oxidize both soluble and solid-phase Fe(II) forms coupled to the reduction of nitrate. Here, we show for the first time Fe(II) oxidation by <I>Sphaerotilus natans</I> strain DSM 6575<SUP>T</SUP> under mixotrophic condition. <I>Sphaerotilus natans</I> has been known to form a sheath structure enclosing long chains of rod-shaped cells, resulting in a thick biofilm formation under oxic conditions. Here, we also demonstrate that strain DSM 6575<SUP>T</SUP> grows mixotrophically with pyruvate, Fe(II) as electron donors and nitrate as an electron acceptor and single cells of strain DSM 6575<SUP>T</SUP> are dominant under anoxic conditions. Furthermore, strain DSM 6575<SUP>T</SUP> forms nanoball-shaped amorphous Fe(III) oxide minerals encrusting on the cell surfaces through the mixotrophic iron oxidation reaction under anoxic conditions. We propose that cell encrustation results from the indirect Fe(II) oxidation by biogenic nitrite during nitrate reduction and that causes the bacterial morphological change to individual rod-shaped single cells from filamentous sheath structures. This study extends the group of existing microorganisms capable of mixotrophic Fe(II) oxidation by a new strain, <I>S. natans</I> strain DSM 6575<SUP>T</SUP>, and could contribute to biogeochemical cycles of Fe and N in the environment.</P>
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Kim, Byung-Keuk,Jo, Youl-Lae The Korean Society for Applied Biological Chemistr 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.5
A microorganism for biological control of sludge bulking was isolated from soil. The isolated microorganism was able to degrade the sheath of the Sphaerotilus natans causing a bulking of activated sludge. The isolated strain, FK3, was identified as a Terrabacter species by analysis of its 16S rRNA genetic sequence. Glucose (0.1%, w/v) and 0.1% yeast extract as carbon and nitrogen sources, respectively, were used in the medium for Terrabacter sp. FK3 growth and enzyme production. Sheath-degrading crude enzyme was purified from a Terrabacter sp. FK3 culture broth via ultrafiltration, followed by DEAE-cellulose chromatography. Although the enzyme activity was optimal at pH 8 and 30$^{\circ}C$, the enzyme maintained stable activity below 50$^{\circ}C$ and in the pH range from 5-10. Sheath-degrading enzyme activity was accelerated by addition of $Mg^{2+}$, $Ca^{2+}$, and $Fe^{2+}$, but inhibited by addition of $Ag^{2+}$ or $Hg^{2+}$. Catalysis was additionally promoted by addition of hydroxyurea, sodium azide, and iodoacetic acid, but inhibited by EDTA.
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김병극,조윤래 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.5
A microorganism for biological control of sludge bulking was isolated from soil. The isolated microorganism was able to degrade the sheath of the Sphaerotilus natans causing a bulking of activated sludge. The isolated strain, FK3, was identified as a Terrabacter species by analysis of its 16S rRNA genetic sequence. Glucose (0.1%, w/v) and 0.1% yeast extract as carbon and nitrogen sources, respectively, were used in the medium for Terrabacter sp. FK3 growth and enzyme production. Sheath-degrading crude enzyme was purified from a Terrabacter sp. FK3 culture broth via ultrafiltration, followed by DEAE-cellulose chromatography. Although the enzyme activity was optimal at pH 8 and 30oC, the enzyme maintained stable activity below 50oC and in the pH range from 5-10. Sheath-degrading enzyme activity was accelerated by addition of Mg2+, Ca2+,and Fe2+, but inhibited by addition of Ag2+ or Hg2+. Catalysis was additionally promoted by addition of hydroxyurea, sodium azide, and iodoacetic acid, but inhibited by EDTA.
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16S rRNA 염기서열을 이용한 낮은 용존산소농도에서 발생한 벌킹슬러지의 우점종 분석
김윤중 ( Yun Jung Kim ),박은혜 ( Eun Hye Park ),김규동 ( Gyu Dong Kim ),남경필 ( Kyoung Phile Nam ),정태학 ( Tai Hak Chung ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
Maintaining dissolved oxygen (DO) at sufficiently low concentration in the aeration tank at a wastewater treatment plant (WWTP) is essential for reduction of the costs of operation and maintenance. On the other hand, the low DO level may result in adverse effect on the integrity of the activated sludge. A typical and disastrous outcome frequently experienced is the outgrowth of filamentous microorganisms, which is called as filamentous bulking. In addition to the traditional methods such as sludge settleability and microscopic observation of the culture, molecular techniques including polymerase chain reaction (PCR) amplification followed by 16S rRNA sequencing were applied to identify filamentous bacteria present in bulking sludge under a condition of low DO concentration. Two morphologically distinct groups, presumably consisting of Sphaerotilus natans, and Eikelboom Type 1701 or Type 1851, were identified through microscopic observation. They were further confirmed by subsequent 16S rRNA sequencing. Dominant filamentous bacteria identified by the molecular techniques were consisted of three major groups. Sequences of partial 16S rRNA cloned showed that the filamentous bulking organisms were closely related to Eikelboom Type 021N and Eikelboom Type 1701, and Sphaerotilus natans, respectively. Molecular methods were found to possess a strong potential of direct examination of the microbial community of an activated sludge system.
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