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( Kenji Furukawa ),( Pham Khac Lieu ),( Hiroyuki Tokitoh ),( Ritsuko Hatozaki ),( Takao Fujii ) 한국물환경학회 ( 구 한국수질보전학회 ) 2005 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2005 No.-
Cultivation of extremely slow growing anammox bacteria was succeeded using up-flow column reactor packed with novel polyester non-woven as biomass carrier. Characterization of an anammox community on a polyester nonwoven attachment medium revealed an organism with a 16S rDNA sequence similarity of 92.2% to the archetypal Candidatus B. anammoxidans. The newly discovered strain (KSU-1, AB057453) was dominant (72.8%) among detectable members of a biofilm community. By fluorescence imaging, KSU-1 was shown to form spherical granular clusters wrapped in a thin layer of Zoogloea sp. This type of anammox reactor was successfully scale-up to the working volume to 50 L. Maximum total volumetric nitrogen removal rate of 1.68kg-N/㎥/d was achieved for the 4 months continuous operation. For the application of anammox reaction to the nitrogen removal process, half of influent NH4-N must be converted to NO2-N as a preceding step for anammox reaction. Operational conditions for this partial nitritation treatments using newly designed attach-immobilized reactor with the volumetric loading rate of 0.48 kg-N/㎥/d. were determined to be pH 7.5 to 7.7 at 35℃ experimentally. Anammox bacteria grew inside of the attach-immobilized sludge during the long term treatment of partial nitritation and influent NH4-N was successfully removed to dinitrogen gas only in one reactor. This newly discovered one stage NH4-N removal process was named as Single-Stage Nitrogen Removal Using Anammox and Partial Nitritation (SNAP) process. This SNAP reactor was operated under operational conditions of pH 7.5-7.7, 35℃ and DO 2-3㎎/ℓ, and 60 to 80% of influent NH4-N were removed under NH4-N loading rate of 0.4kgN/㎥/d. Through the DNA analysis of the sludge attached on net type acryl fiber biomass carrier, it was made clear that ammonium oxidizers and anammox bacteria coexisted in the same attach-immobilized sludge on biomass carriers. Favorable cultural condition for the growth of anammox bacteria was created inside attach-immobilized nitrifying sludge. Two kinds of anammox bacteria and two kinds of ammonium oxidizers were detected in the SNAP sludge. Exiting ratios of anammox and ammonium oxidizing bacteria were estimated to be 15% and 8.7%, respectively, based on the obtained clone numbers in the PCR analysis for SNAP sludge. This coexisting condition was confirmed by the confocal scanning electron microscope on the FISH image of SNAP sludge.
Han, Joon Soo,Sasamori, Takahiro,Mizuhata, Yoshiyuki,Tokitoh, Norihiro Royal Society of Chemistry 2010 Dalton Transactions Vol.39 No.39
<P>The reactivity of a diaryl-substituted disilyne, Ar–Si&z.tbd;Si–Ar, with alkynes was examined. Reaction of the disilyne with acetylene yielded a 1,2-disilabenzene as the sole product.</P> <P>Graphic Abstract</P><P>A 1,2-disilabenzene was obtained from the reaction of a 1,2-diaryldisilyne with acetylene and evidence for its aromaticity was collected. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0dt00115e'> </P>
Han, Joon Soo,Sasamori, Takahiro,Mizuhata, Yoshiyuki,Tokitoh, Norihiro American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.8
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-8/ja9108566/production/images/medium/ja-2009-108566_0005.gif'> <P>The reactivity of a bulky, diaryl-substituted disilyne, Ar−Si?Si−Ar, was examined for the first time. Reaction of the disilyne with ethylene yielded an ethylene-bridged bis(silacyclopropane), which is interpreted as a further reaction product of the initially formed 1,2-disilacyclobutene species with ethylene. A cyclohexane fused with a 1,2-disilacyclobutene was obtained in the reaction with cyclohexene. In the reaction with 2,3-dimethyl-1,3-butadiene, a tricyclo derivative was isolated from the complex product mixture.</P></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja9108566'>ACS Electronic Supporting Info</A></P>
Synthesis and structure of stable 1,2-diaryldisilyne
Sasamori, Takahiro,Han, Joon Soo,Hironaka, Koji,Takagi, Nozomi,Nagase, Shigeru,Tokitoh, Norihiro De Gruyter 2010 Pure and Applied Chemistry Vol.82 No.3
<P>A novel 1,2-diaryldisilyne, BbtSi≡SiBbt (Bbt = 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl), was synthesized as a stable compound by reduction of the corresponding 1,2-dibromodisilene, Bbt(Br)Si=Si(Br)Bbt. The spectral and structural features of this first stable 1,2-diaryldisilyne are revealed, and the Si≡Si triple-bond character is evaluated with the aid of detailed theoretical calculations. The triple-bond characters of BbtSi≡SiBbt and BbtGe≡GeBbt are compared based on experimental and theoretical results.</P>