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Differences in nitrite-oxidizing communities and kinetics in a brackish environment after enrichment at low and high nitrite concentrations

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Journal of Environmental Sciences 2016年第4期28卷 41-49页

作者： Wipasanee Tangkitjawisut Tawan Limpiyakorn Sorawit Powtongsook Preeyaporn Pornkulwat Benjaporn Boonchayaanant Suwannasilp Department of Environmental Engineering Faculty of EngineeringChulalongkorn University Center of Excellence on Hazardous Substance Management (HSM) Chulalongkorn University Center of Excellence for Marine Biotechnology Department of Marine ScienceFaculty of ScienceChulalongkorn University National Center for Genetic Engineering and Biotechnology National Science and Technology Development Agency

Nitrite accumulation in shrimp ponds can pose serious adverse effects to shrimp production and the *** study aims to develop an effective process for the enrichment of ready-to-use nitrite-oxidizing bacteria（NOB）inocula that would be appropriate for nitrite removal in brackish shrimp *** achieve this objective,the effects of nitrite concentrations on NOB communities and nitrite oxidation kinetics in a brackish environment were ***-bed biofilm sequencing batch reactors and continuous moving-bed biofilm reactors were used for the enrichment of NOB at various nitrite concentrations,using sediment from brackish shrimp ponds as seed *** results from NOB population analysis with quantitative polymerase chain reaction（q PCR）show that only Nitrospira were detected in the sediment from the shrimp *** the enrichment,both Nitrospira and Nitrobacter coexisted in the reactors controlling effluent nitrite at 0.1 and 0.5 mg-NO2^--N/*** the other hand,in the reactors controlling effluent nitrite at 3,20,and 100 mg-NO2^--N/L,Nitrobacter outcompeted Nitrospira in many orders of *** half saturation coefficients（Ks）for nitrite oxidation of the enrichments at low nitrite concentrations（0.1 and 0.5 mg-NO2^--N/L）were in the range of 0.71–0.98 mg-NO2^--N/*** contrast,the Ksvalues of NOB enriched at high nitrite concentrations（3,20,and 100 mg-NO2^--N/L）were much higher（8.36–12.20 mg-NO2^--N/L）.The results suggest that the selection of nitrite concentrations for the enrichment of NOB inocula can significantly influence NOB populations and kinetics,which could affect the effectiveness of their applications in brackish shrimp ponds.

关键词： Nitrite-oxidizing bacteria (NOB) Nitrospira Nitrobacter Kinetics Brackish water Shrimp ponds

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Distinguish models mimicking the SM Higgs

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Frontiers of physics 2013年第3期8卷 285-293页

作者： Jung Chang Kingman Cheung Po-Yan Tseng Tzu-Chiang Yuan Department of Physics Tsing Hua University Hsinchu 300 Taiwan China Division of Quantum Phases and Devices School of Physics Konkuk University Seoul 143-701 Republic of Korea Institute of Physics Academia Sinica Nangang Taipei 11529 Taiwan China

The new particle around 125 GeV observed at the LHC is almost consistent with the standard model Higgs boson, except that the diphoton decay mode may be excessive. We summarize a number of possibilities. We propose to use the vector-boson fusion to test the underlying model for electroweak symmetry breaking. Using the well known dijet-tagging technique to single out the vector-boson fusion mechanism, we investigate potential of vector-boson fusion to discriminate a number of models suggested to give an enhanced inclusive diphoton production rate.

关键词： Higgs boson vector-boson fusion diphoton electroweak svmmetrv breaking

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Understanding and Exploiting Information Spreading and Integrating Technologies

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Journal of Computer Science & Technology 2011年第5期26卷 829-836页

作者： Petter Holme Mikael Huss IceLab Department of PhysicsUme a University901 87 Ume aSweden Department of Energy Science Sungkyunkwan University Science of Life Laboratory Stockholm Karolinska Institute Science ParkBox 1031171 21 SolnaSweden Department of Biochemistry and Biophysics The Arrhenius Laboratories for Natural SciencesStockholm University 106 91 StockholmSweden

Our daily life leaves an increasing amount of digital traces,footprints that are improving our ***-mining tools,like recommender systems,convert these traces to information for aiding decisions in an ever-increasing number of areas in our *** feedback loop from what we do,to the information this produces,to decisions what to do next,will likely be an increasingly important factor in human behavior on all levels from individuals to *** this essay,we review some effects of this feedback and discuss how to understand and exploit them beyond mapping them on more well-understood *** take examples from models of spreading phenomena in social media to argue that analogies can be deceptive,instead we need to fresh approaches to the new types of data,something we exemplify with promising applications in medicine.

关键词： modeling and prediction computer-supported collaborative work health care

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The first principle calculation of elemental-vacancy-assisted modifications on structural properties and optical responses of ZnO system

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Progress in Natural Science:Materials International 2020年第1期30卷 118-123页

作者： Shibghatullah Muhammady Suryana Suryana Fatimah Arofiati Noor Yudi Darma Department of Physics Faculty of Mathematics and Natural SciencesInstitut Teknologi Bandung

The structural properties and optical responses of ZnO0.94and Zn0.94O systems as the possible models of ZnO system containing elemental defect states were studied using the plane-wave method within the generalized gradient *** pristine ZnO system was used as the *** simulated XRD patterns showed the three highest intensity for（100）,（002）,and（101） orientations for all the *** to O vacancy,Zn vacancy mostly provided higher structure factor shifts of ZnO ***,the strongest local-symmetry distortion at ZnO4tetrahedra was implied in Zn0.94O *** optical responses showed that all the systems exhibited the optical dichroism based on the extinction coefficient ***,Zn0.94O system showed the lowest energy levels of absorption and high-reflectance ***,the highest saturation threshold energy of the effective number of valence electrons was obtained for this *** result emphasizes the importance of Zn vacancy in providing the significant effect on the optical responses of ZnO system.

关键词： Structural properties Optical responses Optical dichroism ZnO

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Thioredoxin Reductase Type C （NTRC） Orchestrates Enhanced Thermotolerance to Arabidopsis by Its Redox-Dependent Holdase Chaperone Function

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Molecular Plant 2013年第2期6卷 323-336页

作者： Ho Byoung Chae Jeong Chan Moon Mi Rim Shin Yong Hun Chi Young Jun Jung Sun Yong Lee Ganesh M. Nawkar Hyun Suk Jung Jae Kyung Hyun Woe Yeon Kim Chang Ho Kang Dae-Jin Yun Kyun Oh Lee Sang Yeol Lee Division of Applied Life Science (BK21 Program) and PMBBRC Gyeongsang National University 501 Jinju-daero Jinju 660-701 Korea Division of Electron Microscopic Research Korea Basic Science Institute 113 Gwahangno Yuse0ng-guDaejeon 303-333 Korea

Genevestigator analysis has indicated heat shock induction of transcripts for NADPH-thioredoxin reduc-tase, type C （NTRC） in the light. Here we show overexpression of NTRC in Arabidopsis （NTRC°E） resulting in enhanced tolerance to heat shock, whereas NTRC knockout mutant plants （ntrcl） exhibit a temperature sensitive phenotype. To investigate the underlying mechanism of this phenotype, we analyzed the protein＇s biochemical properties and protein structure. NTRC assembles into homopolymeric structures of varying complexity with functions as a disulfide reductase, a foldase chaperone, and as a holdase chaperone. The multiple functions of NTRC are closely correlated with protein structure.. Complexes of higher molecular weight （HMW） showed stronger activity as a holdase chaperone, while low molecular weight （LMW） species exhibited weaker holdase chaperone activity but stronger disulfide reductase and fol-dase chaperone activities. Heat shock converted LMW proteins into HMW complexes. Mutations of the two active site Cys residues of NTRC into Ser （C217/454S-NTRC） led to a complete inactivation of its disulfide reductase and foldase chaperone functions, but conferred only a slight decrease in its holdase chaperone function. The overexpression of the mutated C217/454S-NTRC provided Arabidopsis with a similar degree of thermotolerance compared with that of NTRC°E plants. However, after prolonged incubation under heat shock, NTRC°E plants tolerated the stress to a higher degree than C217/454S-NTRC°E plants. The results suggest that the heat shock-mediated holdase chaperone function of NTRC is responsible for the increased thermotolerance of Arabidopsis and the activity is significantly supported by NADPH.

关键词： NADPH-thioredoxin reductase type C (NTRC) oligomeric complexes disulfide reductase foldase and holdasechaperone functions redox thermotolerance.

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DNA-Binding Domain of AtTRB2 Reveals Unique Features of a Single Myb Histone Protein Family that Binds to Both Arabidopsis- and Human-Type Telomeric DNA Sequences

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Molecular Plant 2012年第6期5卷 1406-1408页

作者： Won Kyung Lee Ji-Hye Yun Weontae Lee Myeon Haeng Cho Department of Systems Biology College of Life Science and Biotechnology Yonsei University Seoul 120–749 Korea Department of Biochemistry College of Life Science and Biotechnology Yonsei University Seoul 120–749 Korea

Dear Editor, Telomeres are specific protein-DNA complexes that pro- tect the ends of eukaryotic chromosomes from fusion and degradation and are maintained by a specialized mecha- nism exerted by telomerase and telomere-binding proteins. Mammalian telomeres contain TTAGGG and are associated with a six-protein （e.g. TRF1, TRF2, TIN2, RAP1, POT1, and TPP1） complex called shelterin （de Lange, 2005）, which was involved in telomere homeostasis. Similarly to mammalian telomeres, telomeres in most plants are maintained by tel- omerase and telomere-associated proteins （e.g. AtTBP1, AtTRP1, AtTRB1, POT1, POT2, KU70, and KU80） and consist of tandem arrays of TTTAGGG. Among telomere-associated proteins in Arabidopsis thaliana, AtTRB proteins belong to the SMH （Single-Myb-Histone）-Iike family, in which proteins are composed of an N-terminal Myb domain, a central his- tone Hl-like globular domain, and a C-terminal coiled-coil region.

关键词： DNA结合结构域端粒结合蛋白组蛋白拟南芥 DNA序列 Arabidopsis 结合型家族

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Lanthanide NIR luminescence for telecommunications, bioanalyses and solar energy conversion

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Journal of Rare Earths 2010年第6期28卷 824-842页

作者： Jean-Claude G. Bünzli Svetlana V. Eliseeva cole Polytechnique Fédérale de Lausanne Institute of Chemical Sciences and Engineering wcu Professor Korea University Center for Next Generation Photovoltaic Systems Katholieke Universiteit Leuven Department of Chemistry Laboratory of Coordination Chemistry

Present-day advanced technologies heavily rely on the exciting magnetic and spectroscopic properties of lanthanide ions. In particular, their ability to generate well-characterized and intense near-infrared (NIR) luminescence is exploited in any modern fiber-optic telecommunication network. In this feature article, we first summarize the whereabouts underlying the design of highly luminescent NIR molecular edifices and materials. We then focus on describing the main trends in three applications related to this spectral range: telecommunications, biosciences, and solar energy conversion. In telecommunications, efforts concentrate presently on getting easily processable polymer-based waveguide amplifiers. Upconversion nanophosphors emitting in the visible after NIR excitation are now ubiquitous in many bioanalyses while their application to bio-imaging is still in its early stages; however, highly sensitive NIR-NIR systems start to be at hand for both in vitro and in vivo imaging, as well as dual probes combining magnetic resonance and optical imaging. Finally, both silicon-based and dye-sensitized solar cells benefit from the downconversion and upconversion capabilities of lanthanide ions to harvest UV and NIR solar light and to boost the overall quantum efficiency of these next-generation devices.

关键词： lanthanide luminescence near-infrared luminescence telecommunications bioanalysis solar energy conversion solar cell upconversion downconversion

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ESTIMATOR COMPETITION FOR POISSON PROBLEMS

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Journal of Computational Mathematics 2010年第3期28卷 309-330页

作者： C.Carstensen C.Merdon Humboldt-Universitt zu Berlin Department of Computational Science and Engineering Yonsei University

We compare 13 different a posteriori error estimators for the Poisson problem with lowest-order finite element discretization. Residual-based error estimators compete with a wide range of averaging estimators and estimators based on local problems. Among our five benchmark problems we also look on two examples with discontinuous isotropic diffusion and their impact on the performance of the estimators. （Supported by DFG Research Center MATHEON.）

关键词： Finite element methods A posteriori error estimators.

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Strong dependency of lithium diffusion on mechanical constraints in high-capacity Li-ion battery electrodes

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Acta Mechanica Sinica 2012年第4期28卷 1068-1077页

作者： Yi-Fan Gao Min Zhou The George W. Woodruff School of Mechanical Engineering The School of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA30332-0405 USA wcu Program on Multiscale Mechanical Design School of Mechanical and Aerospace EngineeringSeoul National University Seoul Korea

The effect of external constraints on Li diffusion in high-capacity Li-ion battery electrodes is investigated using a coupled finite deformation theory. It is found that thinfilm electrodes on rigid substrates experience much slower diffusion rates compared with free-standing films with the same material properties and geometric dimensions. More importantly, the study reveals that mechanical driving forces tend to retard diffusion in highly-constrained thin films when lithiation-induced softening is considered, in contrast to the fact that mechanical driving forces always enhance diffusion when deformation is fully elastic. The results provide further proof that nano-particles are a better design option for nextgeneration alloy-based electrodes compared with thin films.

关键词： Li-ion battery - Inelastic flow Lithiation in- duced softening Changing rate

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Preparation of Highly Crystalline Graphitic Nanocarbon for the Electro-Oxidation of Methanol

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Nano Research 2011年第1期4卷 92-102页

作者： Ji Bong Joo Nam Dong Kim Hyeong Jin Yun Pil Kim Jongheop Yi World Class University （wcu） program of Chemical Convergence for Energy ＆ Environment （C2E2） School of Chemical and Biological Engineering Seoul National University Shinlim-dong Kwanak-ku Seoul 151-742 Republic of Korea School of Environmental and Chemical Engineering Specialized Graduate School of Hydrogen and Fuel Cell Engineering Chonbuk National University Jeonju 561-756 Republic of Korea

Highly crystalline graphitic nanocarbons （GNC） have been prepared by the wet-air treatment of hydrothermally- derived graphitic porous carbon. The materials were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and electrochemical methods. The experimental results revealed that the treatment temperature has a significant effect on the morphology and degree of graphitic crystallinity. When GNC was treated at 450 ~C under a wet-air atmosphere, the product （GNC-450） consisted of aggregates of silkworm-shaped carbon nanoparticles with enhanced graphitic characteristics. GNC-450 was evaluated as a catalyst support in the electro-oxidation of methanol. The Pt/GNC-450 catalyst contained smaller Pt particles and had a higher electrochemically active surface area than a commercial carbon black-supported Pt catalyst. In the electro-oxidation of methanol, the Pt/GNC-450 catalyst showed the highest performance among the Pt catalysts examined in this study. The superior catalytic performance appears to be closely related to the enhanced graphitic characteristics with highly dispersed Pt nanoparticles on the graphitic layers, which have a positive effect on the electrochemical performance.

关键词： Graphitic nanostructured carbon wet-air treatment enhanced crystallinity Pt catalyst

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