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Dodecanuclear‐Ellipse and Decanuclear‐Wheel Nickel(II) Thiolato Clusters with Efficient Femtosecond Nonlinear Absorption†

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Angewandte Chemie 2010年第25期122卷

作者： Chi Zhang Tsuyoshi Matsumoto Marek Samoc Simon Petrie Suci Meng T. Christopher Corkery Robert Stranger Jinfang Zhang Mark G. Humphrey Kazuyuki Tatsumi Molecular Materials Research Center Scientific Research Academy School of Chemistry and Chemical Engineering Jiangsu University Zhenjiang 212013 (P.R. China) Fax: (+86) 511‐8879‐7815 Research Center for Materials Science and Department of Chemistry Graduate School of Science Nagoya University Nagoya 464‐8602 (Japan) Fax: (+81) 52‐789‐2943 Institute of Physical and Theoretical Chemistry Wroclaw University of Technology 50370 Wroclaw (Poland) Laser Physics Centre Research School of Physics and Engineering Australian National University Canberra ACT 0200 (Australia) Research School of Chemistry Australian National University Canberra ACT 0200 (Australia) Fax: (+61) 2‐6125‐0760

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Tandem multimer expression of angiotensin I-converting enzyme inhibitory peptide in Escherichia coli

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Biotechnology Journal 2009年第9期4卷 1345-1356页

作者： Fida, Hasan M. Kumada, Yoichi Terashima, Masaaki Katsuda, Tomohisa Katoh, Shigeo Department of Molecular Science and Material Engineering Graduate School of Science and Technology Faculty of Engineering Kobe Japan Department of Chemistry and Materials Technology Kyoto Institute of Technology Kyoto Japan Department of Biosphere Sciences School of Human Science Kobe College Nishinomiya Japan Department of Chemical Engineering Hanyang University 1271 Sa-3-dong Sangrok-gu Ansan 426-791 Korea Republic of Department of Process Engineering and Applied Science Food Science and Technology Program Dalhousie University 1360 Barrington Street Halifax NS B3J 2X4 Canada

It is common for small tandem peptide multimer genes to be indirectly inserted into expression vectors and fused with a protein tag. In this study, a multimer of the tandem angiotensin I-converting enzyme inhibitory peptide (ACE-IP) gene was directly transferred to a commercially available vector and the designed gene was expressed as a repeated peptide in Escherichia coli BL21(DE3)pLysS. The process further developed in our study was the construction of six-repeated ACE-IP synthetic genes and their direct insertion. Protein expression in inclusion bodies was confirmed by SDS-PAGE and Western blot. Acid hydrolysis of inclusion bodies produced single-unit peptides through cleavage of the aspartyl-prolyl bonds. This cleaved recombinant peptide (rACE-IP) was purified using immuno-affinity chromatography followed by reversed phase-HPLC. 105-115 mg of the lyophilized recombinant peptide was obtained from 1 L E. coli culture. In vitro biological activity of rACE-IP was indistinguishable from that of the natural peptide produced by hydrolysis in artificial gastric juice or by acidic hydrolysis. The rACE-IP prepared by recombinant DNA technology and solid-phase synthesis methods showed a similar IC50. This strategy could be used for the expression of important peptides, which have N-terminal proline (P) and C-terminal aspartic acid residues (D) for commercial applications, e.g. functional foods and drinks. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Peptides

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Zirconia coated carbonyl iron particle-based magnetorheological fluid for polishing

Zirconia coated carbonyl iron particle-based magnetorheologi...

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Optical Manufacturing and Testing VIII

作者： Shafrir, Shai N. Romanofsky, Henry J. Skarlinski, Michael Wang, Mimi Miao, Chunlin Salzman, Sivan Chartier, Taylor Mici, Joni Lambropoulos, John C. Shen, Rui Yang, Hong Jacobs, Stephen D. OptiPro Systems 6368 Dean Parkway Ontario NY United States Department of Mechanical Engineering University of Rochester Rochester NY United States Laboratory for Laser Energetics University of Rochester Rochester NY United States Department of Chemical Engineering University of Rochester Rochester NY United States Materials Science Program University of Rochester Rochester NY United States Institute of Optics University of Rochester 240 East River Road Rochester NY 14623 United States

ISBN: (纸本)9780819477163

Aqueous magnetorheological (MR) polishing fluids used in magnetorheological finishing (MRF) have a high solids concentration consisting of magnetic carbonyl iron particles and nonmagnetic polishing abrasives. The properties of MR polishing fluids are affected over time by corrosion of CI particles. Here we report on MRF spotting experiments performed on optical glasses using a zirconia coated carbonyl iron (CI) particle-based MR fluid. The zirconia coated magnetic CI particles were prepared via sol-gel synthesis in kg quantities. The coating layer was ˜50-100 nm thick, faceted in surface structure, and well adhered. Coated particles showed long term stability against aqueous corrosion. "Free" nano-crystalline zirconia polishing abrasives were co-generated in the coating process, resulting in an abrasivecharged powder for MRF. A viable MR fluid was prepared simply by adding water. Spot polishing tests were performed on a variety of optical glasses over a period of 3 weeks with no signs of MR fluid degradation or corrosion. Stable material removal rates and smooth surfaces inside spots were obtained. © 2009 SPIE.

关键词： Magnetorheological fluids

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Optical Analysis of a series of Size and Shape-controlled Type-II CdTe/CdSe/CdTe Heterostructure Nanorods

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Journal of Physics: Conference Series 2010年第1期245卷

作者： Hongming Zhao Bonil Koo J L Movilla Dongmin Chen Brian A Korgel Kuntheak Kheng Nanophysics and Semiconductor Group CEA/CNRS/Université Joseph Fourier Institut Néel 38054 Grenoble Cedex 9 France Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences 100190 Beijing People's Republic of China Department of Chemical Engineering Center for Nano- and Molecular Science and Technology and Texas Materials Institute University of Texas Austin TX 78712 USA Department of Physical and Analytical Chemistry University Jaume-I E-12080 Castelló Spain

Two series of size and shape-controlled type-II CdTe/CdSe/CdTe heterostructure nanorods with different geometrical structures were prepared by the colloidal sequential reactant injection technique. The samples, including pure CdSe seeds, were optically analysed by steady state and time resolved photoluminescence spectra. The experimental results demonstrate that the energy and lifetime of the photoluminescence from charge-separated band structure can be tuned by the nature of nanorods' band edges in both 'linear' and 'core-shell' heterostructure nanorods. But between different groups of nanorod samples, the spectral properties show different variation tendencies with the increasing CdTe tip. As one possible explanation, the compensation between the variations of kinetic and Coulomb contributions was discussed by numerical calculations based on the effective mass and envelope function approximations.

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Formulation of reactive nanostructured adhesive microbial ink-jet inks for miniature biosensors and biocatalysis

Formulation of reactive nanostructured adhesive microbial in...

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作者： Flickinger, M.C. Lyngberg, O.K. Freeman, E.A. Anderson, C.R. Laudon, M.C. BioTechnology Institute University of Minnesota St. Paul MN 55108 United States Department of Biochemistry Molecular Biology and Biophysics University of Minnesota St. Paul MN 55108 United States Bristol-Myers Squibb New Brunswick NJ 08903 United States Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis MN 55455 United States Grain Value LLC St. Paul MN 55118 United States Department of Plant Biology University of Minnesota St. Paul MN 55108 United States Department of Microbiology Chemical and Biomolecular Engineering North Carolina State University Raleigh NC 27695 United States

ISBN: (纸本)9780841274488

Reactive adhesive microbial inks can be formulated from aqueous latex emulsions for drop on demand (DOD) piezoelectric deposition. Ink-jet printing of a high density of living microorganisms many be useful to generate microstructures for micro-biosensors, as biocatalytic coatings in micro-fluidic devices, or micro-channel bioreactors. Microbial inks are viable wet cell paste mixed with aqueous (organic solvent-free) emulsions of adhesive polymer particles that dry rapidly with arrested coalescence as thin, adhesive, nanoporous coatings. Latex ink viscosity (~1.5 to 3 cP) is semi-shear rate dependent. Nanoporosity is essential for the embedded microorganisms to retain viability and reactivity. The nanoporous latex inks in this study contain glycerol and sucrose added to a low Tg acrylate/vinyl acetate latex emulsion (particle dia. ~280nm, Tg ~10°C). The glycerol and sucrose arrest polymer particle coalescence during film formation (porogens) and also act as osmoprotectants. Viability and reactivity is measured by bioluminescence following deposition, drying, and rehydration in nitrogen-limited (nongrowth) media. As a model system, the reactivity of Escherichia coli (4 cfu/nl ink) containing a mercury (Hg+2)-inducible promoter-lux fusion was studied by printing patches, microwells and multi-layer dot arrays onto polyester using office ink-jet printers and a piezoelectric nano-plotter. E. coli can be printed at a density of ~1.5 cells/μm2. Reactivity (luminescence resulting from luxCDABE expression) is a function of drying conditions (temperature, relative humidity), nanoporosity following rehydration, Hg +2 concentration, and volume printed. Print resolution is determined by piezo tip aperture diameter (25 μm, ~0.2 nl/droplet;50 μm, ~0.5 nl/droplet) and drying rate. Profilometry of dry latex microstructures indicated significant surface-tension driven flow prior to ink drying. Viable Kluyveromyces fragilis (~12 μm diameter) have also been printed as a larger model mic

关键词： Glycerol

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Research and Education in Green materials: A multi-disciplinary program to bridge the gaps

Research and Education in Green Materials: A multi-disciplin...

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IEEE International Symposium on Electronics and the Environment

作者： Julie M. Schoenung Oladele A. Ogunseitan David A. Eastmond Department of Chemical Engineering and Materials Science University of California Davis CA USA Chair in the Program in Public Health College of Health Sciences University of California Irvine CA USA Department of Cell Biology and Neuroscience University of California Riverside CA USA

ISBN: (纸本)9781424443246

The University of California has recently funded a new Lead Campus program: Research and Education in Green materials, a multi-campus graduate fellowship program designed to bridge the disciplinary boundaries of engineering, science, toxicology and social science. This paper describes the program and the graduate course on green engineering.

关键词： Educational programs Bridges Toxicology materials science and technology Collaboration Education Design engineering Consumer products Manufacturing Risk management

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Novel Low-Temperature Behavior in Classical Many-Particle Systems

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Physical Review Letters 2009年第5期103卷 050602-050602页

作者： Robert D. Batten Frank H. Stillinger Salvatore Torquato Department of Chemical Engineering Princeton University Princeton New Jersey 08544 USA Department of Chemistry Princeton University Princeton New Jersey 08544 USA Princeton Materials Institute Program in Applied and Computational Mathematics Princeton Center for Theoretical Science Princeton University Princeton New Jersey 08544 USA School of Natural Sciences Institute for Advanced Study Princeton New Jersey 08544 USA

We show that classical many-particle systems interacting with certain soft pair interactions in two dimensions exhibit novel low-temperature behaviors. Ground states span from disordered to crystalline. At some densities, a large fraction of normal-mode frequencies vanish. Lattice ground-state configurations have more vanishing frequencies than disordered ground states at the same density and exhibit vanishing shear moduli. For the melting transition from a crystal, the thermal expansion coefficient is negative. These unusual results are attributed to the topography of the energy landscape.

关键词： Ground state

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Bifurcation and Chaos in a Model of Cardiac Early Afterdepolarizations

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Physical Review Letters 2009年第25期102卷 258103-258103页

作者： Diana X. Tran Daisuke Sato Arik Yochelis James N. Weiss Alan Garfinkel Zhilin Qu Department of Medicine (Cardiology) David Geffen School of Medicine University of California Los Angeles California 90095 USA Molecular Cellular and Integrative Physiology Program University of California Los Angeles California 90095 USA Department of Chemical Engineering Technion—Israel Institute of Technology Haifa 32000 Israel Department of Physiology David Geffen School of Medicine University of California Los Angeles California 90095 USA Department of Physiological Science University of California Los Angeles California 90095 USA

Excitable cells can exhibit complex patterns of oscillations, such as spiking and bursting. In cardiac cells, pathological voltage oscillations, called early afterdepolarizations (EADs), have been widely observed under disease conditions, yet their dynamical mechanisms remain unknown. Here, we show that EADs are caused by Hopf and homoclinic bifurcations. During period pacing, chaos always occurs at the transition from no EAD to EADs as the stimulation frequency decreases, providing a distinct explanation for the irregular EAD behavior frequently observed in experiments.

关键词： Condensed matter physics

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Atomic structure of the Ag/Ge(111)-(√3√3) surface: From scanning tunneling microscopy observation to theoretical study

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Journal of chemical Physics 2009年第22期131卷 224705页

作者： Chou, L.-W. Wu, H.C. Lee, Y.-R. Jiang, J.-C. Su, C. Lin, J.-C. Institute of Atomic and Molecular Sciences Academia Sinica P.O. Box 23-166 Taipei 106 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Department of Chemistry National Taiwan Normal University Taipei 106 Taiwan Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei 106 Taiwan

The atomic structure of the Ag/Ge(111)-(√3√3)R30 surface is studied by scanning tunneling microscopy (STM) and the density functional theory (DFT) calculations. Our STM images have shown a structure which is different from the widely accepted honeycomb-chained-triangle (HCT) model before. The structure is similar to the inequivalent triangle (IET) model found for the Ag/Si(111)-(√3√3)R30 surface. This model proposed two types of silver triangles with different sizes in the unit cell, corresponding to the bright spots and the dark spots in the STM image. A distinguishable hexagonal pattern of the IET structure was well disclosed in the temperature range from 100 to 473 K in our STM studies for Ag/Ge(111)- (√3√3)R30. Furthermore, the result of the DFT calculations showed that the IET structure is 0.20 eV energetically more stable than the HCT model. Besides, the Ge triangles, which were not disclosed in earlier STM research, are found in this study. © 2009 American Institute of Physics.

关键词： Scanning tunneling microscopy

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Probing surface plasmons in individual Ag nanoparticles in the ultra-violet spectral regime

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Nanotechnology 2009年第23期20卷 235705页

作者： Chu, Ming-Wen Sharma, Pradeep Chang, Ching-Pin Liou, Sz Chian Tsai, Kun-Tong Wang, Juen-Kai Wang, Yuh-Lin Chen, Cheng Hsuan Center for Condensed Matter Sciences National Taiwan University Taipei 106 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei 106 Taiwan Taiwan International Graduate Program Academia Sinica Taipei 106 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei 106 Taiwan

Previous investigations of surface plasmons in Ag largely focused on their excitations in the visible spectral regime. Using scanning transmission electron microscopy with an electron beam of 0.2nm in conjunction with electron energy-loss spectroscopy, we spectrally and spatially probe the surface plasmons in individual Ag nanoparticles (∼30nm), grown on Si, in the ultra-violet spectral regime. The nanomaterials show respective sharp and broad surface-plasmon resonances at ∼3.5eV (∼355nm) and ∼7.0eV (∼177nm), and the correlated spectral calculations established their multipolar characteristics. The near-field distributions of the surface plasmons on the nanoparticles were also mapped out, revealing the predominant dipolar nature of the 3.5eV excitation with obvious near-field enhancements at one end of the nano-object. The unveiled near-field enhancements have potential applications in plasmonics and molecular sensing. © 2009 IOP Publishing Ltd.

关键词： Silver nanoparticles

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