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作者： Aono, Hiromichi Kondo, Nobuyuki Katagishi, Haruo Kurihara, Masato Sakamoto, Masatomi Sadaoka, Yoshihiko Department of Materials Science and Engineering Faculty of Engineering Ehime University Matsuyama 790-8577 Japan Graduate Program of Human Sensing and Functional Sensor Engineering Graduate School of Science and Engineering Yamagata University Yamagata 990-8560 Japan Department of Material and Biological Chemistry Faculty of Science Yamagata University Yamagata 990-8560 Japan

Heteronuclear Bi1-x La x [Fe(CN)6] &middotnH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TG... 详细信息

Heteronuclear Bi1-x La x [Fe(CN)6] ·nH2O complexes were synthesized, and their crystal structures and thermal decomposition process were investigated by X-ray diffraction (XRD), thermogravimetry analysis (TGA), Auger electron spectroscopy (AES) with scanning electron microscope (SEM), and transmission electron microscopy (TEM). The crystal system of the complexes was orthorhombic having n = 4 for x = 0-0.7 and was hexagonal having n = 5 for x = 1.0. Their mixture was confirmed for x = 0.8 and 0.9. The lattice parameters for the orthorhombic increased with increasing the x value for the complexes. The single phase of trimetallic perovskite-type Bi1-x La x FeO3 was obtained by its thermal decomposition at low temperature. The crystal system was hexagonal for BiFeO3 (x = 0) and orthorhombic for x = 0.1-1.0. In the case of the decomposed perovskite sample, the lattice parameters decreased with increasing x values for Bi1-x La x FeO3. The particle size was ca. 30 nm for Bi0.2La0.8FeO3 obtained by thermal decomposition at 500 °C and it grew with an increase in decomposition temperature. For the Bi0.5La0.5FeO 3, AES showed that the elemental distributions of Bi, La, and Fe on the surface were very homogeneous for the sample decomposed at 700 °C.

关键词： Bismuth compounds

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Axial-Strain-Induced Torsion in Single-Walled Carbon Nanotubes

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Physical Review Letters 2006年第16期96卷 165501-165501页

作者： Haiyi Liang Moneesh Upmanyu Group for Simulation and Theory of Atomic-Scale Material Phenomena (stAMP) Materials Science Program Division of Engineering Colorado School of Mines Golden Colorado 80401 USA

Using classical molecular dynamics and empirical potentials, we show that the axial deformation of single-walled carbon nanotubes is coupled to their torsion. The axial-strain-induced torsion is limited to chiral nanotubes—graphite sheets rolled around an axis that breaks its symmetry. Small strain behavior is consistent with chirality and curvature-induced elastic anisotropy (CCIEA)—carbon nanotube rotation is equal and opposite in tension and compression, and decreases with curvature and chirality. The large-strain compressive response is remarkably different. The coupling progressively decreases, in contrast to the tensile case, and changes its sign at a critical compressive strain. Thereafter, it untwists with increasing axial strain and then rotates in the opposite direction, i.e., the same sense as under tension. This suggests that the response is now dictated by a combination of nonlinear elasticity and CCIEA.

关键词： .PRL SWCNTs Torsion axial strain Small strain CCIEA curvature and chirality

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STUDIES ON ION BEAM APPLICATION TO IMPROVE AQUATIC MACROPHYTE REMEDIATION CAPACITY IN EUTROPHIC WATERS

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水生生物学报 2006年第6期30卷 711-717页

作者： LI Miao1, WU Yue-Jin 1, ZHANG Jun 1, YU Han-Qing 2, WU Xiao-Lei 3 and YU Zeng-Liang 1 (1. Key Laboratory of Ion Beam bioengineering, Institute of Plasma Physics, the Chinese Academy of sciences, Hefei, China 230031 2. school of Chemistry and material science, the University of science and Technology of China, Hefei, China 230026 3. Department of Environmental science and engineering, Tsinghua University, Beijing, China 100084 ) Institute of Plasma Physics the Chinese Academy of Sciences Key Laboratory of Ion Beam Bioengineering CAS Hefei 230031 School of Chemistry and Material Science the University of Science and Technology of China Hefei 230026 Department of Environmental Science and Engineering Tsinghua University Beijing 100084

Using ion beam biotechnology in combination with soil-less plant cultivation on artificial substratum (floating beds), the experiments were conducted with Ipomoea aquatica Forsk. Plants were attached to floating-beds which were placed on the surface of artificially nutrient-enriched tank water, in order to study the purification and remediation efficiency of ion beam-treated I. aquatica cultivars. The results show that N + ion beams with 25keV energy and dosages of 0, 2.6, 3.9, 5.2, 6.5, 7.8, 9.1×10 13N +(ions)/cm 2 affected I. aquatica dry seeds differently, with the dose of 3.9×10 13N + (ions)/cm 2 improving effectively the performance as expressed by various biological indices. After ion beam application, I. aquatica cultivars grew well in nutrient-enriched water bodies, increasing the growth of leaves and stem, number of leaves, length and area of roots, plant height, and weight more remarkably than observed in the control. The net removing rates of TN, TP were as high as 75% and 82%, respectively. Especially under the dose of 3.9×10 13N +(ions)/cm 2, the net removing rates of TN, TP were highest, for 77% and 85%, respectively. It was proved that ion beam application improves phytoremediation and may be used to purify nutrient rich water bodies.

关键词： Ion beam treatment Aquatic macrophyte Ipomoea aquatica Forsk Nutrient-enriched waters Remediation capacity

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Preparation of poly(succinimide) microcapsules with pH-response of drug release

Preparation of poly(succinimide) microcapsules with pH-respo...

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2006 AIChE Annual Meeting

作者： Nishino, Satoru Ono, Tsutomu Kitamura, Yoshiro Kishida, Akio Yoshizawa, Hidekazu Department of Material and Energy Science Graduate School of Environmental Science Okayama University 3-1-1 Tsushima-naka Okayama 700-8530 Japan Department of Chemical Engineering Nara National College of Technology 22 Yata Yamatokoriyama Nara 639-1080 Japan Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University 2-3-10 Kanda-Surugadai Chiyoda-ku Tokyo 101-0062 Japan

ISBN: (纸本)081691012X

We prepared the poly(succinimide) (hereafter abbreviated as PSI) microcapsules with antitumor agent showing a pH-responsive release. PSI microcapsules enclosing Irinotecan hydrochloride (CPT-11) were prepared by solvent evaporation method via O/O emulsion system. The obtained PSI microcapsules had a smooth surface and were spherical with diameter of approximately 30 urn. CPT-11 was successfully microencapsulated with high entrapment efficiency of above 90 %. From the results of in vitro release test in an aqueous media with variety of pH, CPT-11 was constantly released for 1 week with no initial burst at pH 5. On the other hand, it was clearly observed the pH-dependency of release rate. That is, the release rate was increased at the higher pH in aqueous media. From SEM observations of internal structure of PSI microcapsules after incubation in aqueous media, it was found that the hole was observed in center of microcapsules.

关键词： Emulsification

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Integral videography autostereoscopic display using multiprojection

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Systems and Computers in Japan 2006年第5期37卷 34-45页

作者： Liao, Hongen Iwahara, Makoto Koike, Takefumi Momoi, Yasuyuki Hata, Nobuhiko Sakuma, Ichiro Dohi, Takeyoshi Graduate School of Engineering University of Tokyo Tokyo 113-8656 Japan Z-axis Ltd. Japan Hitachi Ltd. Tokyo 101-8010 Japan Graduate School of Frontier Sciences University of Tokyo Tokyo 113-8656 Japan Graduate School of Information Science and Technology University of Tokyo Tokyo 113-8656 Japan Nano Bioengineering Education Program Graduate School of Engineering University of Tokyo Z-axis Ltd. Systems Development Laboratory Hitachi Ltd. Graduate School of Information Science and Technology University of Tokyo Institute of Environmental Studies Graduate School of Frontier Sciences University of Tokyo

Various techniques of autostereoscopic three-dimensional (3D) display for displaying real 3D information have been investigated in recent years. We have performed research and application of integral videography (IV), which is an animated display technique based on the principle of integral photography (IP). Although IV and IP are ideal ways to display 3D images, their spatial viewing resolution and high-speed image rendering algorithm must be improved. The pixel pitch of the display and the lens pitch are the main factors affecting IV image quality. We improved the image quality by increasing the number and density of the pixels. Parallel image processing and displaying method were also developed for animated IV imaging. We have created a scalable high-resolution image using multiple projection and project it onto a small screen to achieve high-density pixels using long-focal-length projection optics. Furthermore, an image calibration method was developed for geometrical correction and color modulation to generate seamless IV images. We evaluated the developed device by displaying an X-ray computed tomography (CT) image. Measurement of the geometrical accuracy of the reproduced IV images demonstrated that the spatial resolution of the display system matched that by theoretical analysis. Experimental results showed that our technique is very effective in obtaining 3D animated images with practical spatial resolution. © 2006 Wiley Periodicals, Inc.

关键词： Display devices

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Effects of medium composition on the production of plasmid DNA vector potentially for human gene therapy

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Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2005年第5期6卷 396-400页

作者：徐志南沈文和陈灏岑沛霖 Institute of Bioengineering School of Material Science and Chemical Engineering Zhejiang University Hangzhou 310027 China

Plasmid vector is increasingly applied to gene therapy or gene vaccine. The production of plasmid pCMV-AP3 for cancer gene therapy was conducted in a modified MBL medium using a recombinant E. coli BL21 system. The effects of different MMBL components on plasmid yield, cell mass and specific plasmid DNA productivity were evaluated on shake-flask scale. The results showed that glucose was the optimal carbon source. High plasmid yield (58.3 mg/L) was obtained when 5.0 g/L glucose was added to MMBL. Glycerol could be chosen as a complementary carbon source because of the highest specific plasmid pro- ductivity (37.9 mg DNA/g DCW). After tests of different levels of nitrogen source and inorganic phosphate, a modified MMBL medium was formulated for optimal plasmid production. Further study showed that the initial acetate addition (less than 4.0 g/L) in MMBL improved plasmid production significantly, although it inhibited cell growth. The results will be useful for large-scale plasmid production using recombinant E. coli system.

关键词： Plasmid DNA Growth medium Gene therapy

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A segmentation method using compound markov random fields based on a general boundary model

A segmentation method using compound markov random fields ba...

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IEEE International Conference on Image Processing 2005, ICIP 2005

作者： Wu, Jue Chung, Albert C. S. Bioengineering Program School of Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong

ISBN: (纸本)0780391349

Markov random field (MRF) theory has widely been applied to segmentation in noisy images. This paper proposes a new MRF method. First, it couples the original labeling MRF with a boundary MRF that can help improve the performance of segmentation. Second, the boundary model is general and does not need prior training. Third, unlike existing related work, our model offers more compact interaction between the two MRFs. Experiments on synthetic images and real clinical datasets show that the proposed approach is able to produce good segmentation results, especially removing noise in low signal-to-noise ratio regions. © 2005 IEEE.

关键词： Image segmentation

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MAPLE Direct Write (DW) patterning of Bio-active Ceramic Nanocomposites

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MRS Online Proceedings Library 2005年第1期845卷 18-23页

作者： Doraiswamy, A. Patz, T. M. Narayan, R. J. Harris, L. Auyeung, R. Modi, R. Chrisey, D. B. Bioengineering Program & School of Material Science and Engineering Georgia Institute of Technology Atlanta USA US Naval Research Laboratory Washington DC USA

A laser-based approach, Matrix Assisted Pulsed Laser Direct Write (MAPLE) technique is used to demonstrate two-dimensional direct writing of ceramics such as hydroxyl-apatite and zirconia, for developing inorganic scaffolds. We also demonstrate the patterning of live MG63 osteoblast cells onto various substrates. Our results show successful direct writing of ceramics and live cells concurrently, with a growth profile similar to that of as-deposited cells. After several days of growth, a live/dead assay shows live cells suggesting the biocompatibility of the ceramic and the viability of the process. This investigation demonstrates a novel method of developing heterogeneous tissue scaffolds, such as a cell-ceramic composite by CAD/CAM patterns.

关键词：

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Preparation of the gold colloids containing PEGylated nanogel as a high functional nanoreactor

Preparation of the gold colloids containing PEGylated nanoge...

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54th SPSJ Symposium on Macromolecules

作者： Hayashi, Hisato Uno, Teppei Ishii, Takehiko Iijima, Michihiro Kataoka, Kazunori Nagasaki, Yukio Graduate School of Pure and Applied Sciences University of Tsukuba Department of Material Science and Technology Tokyo University of Science Department of Materials Chemistry and Bioengineering Oyama National College of Technology Department of Materials Science Graduate School of Engineering University of Tokyo University of Tsukuba

pH-sensitive nanogel possessing PEG-COOH tethered chain surface was prepared by the emulsion copolymerization of 2-N,N-diethylaminoethyl methacrylate in the presence of CH2=CH-Ph-CH2-PEG-COOH. By mixing Au3+ ion to the prepared nanogel solution at room temperature, the amino group in the core of the nanogel reduced to form the nanogel containing gold nanopartile in the core.(Fig.1) Figure 2 shows a transmission electron microscopy (TEM) image of the obtained gold nanoparticles incorporated nanogels. The gold nanoparticle containing nanogel was fairly stable even in high salt concentration. By changing pH, the nanogel showed volume transition. These features indicate the potential utility of nanogels in the not only biomedical fields of high performance colloidal sensor systems but also industrial applications as a high dispersion stability nanoreactor.

关键词： Colloids

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Biocompatlbility of CAD/CAM ORMOCER polymer scaffold structures

Biocompatlbility of CAD/CAM ORMOCER polymer scaffold structu...

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Nanoscale materials science in Biology and Medicine

作者： Doraiswamy, A. Patz, T. Narayan, R. Chichkov, B. Ovsianikov, A. Houbertz, R. Modi, R. Auyeung, R. Chrisey, D.B. Bioengineering Program and School of Material Science and Engineering Georgia Institute of Technology Atlanta GA United States Laser Zentrum Hannover Hannover D-30419 Germany Fraunhofer Institute for Silicate Research Wurzburg Germany US Naval Research Laboratory Washington DC United States

A fresh approach with a novel process and a hybrid material is explored for developing designer 3-dimensional functional tissue scaffolds. The process of two photon-induced polymerization generally used for electronic and optical materials is introduced for developing biological scaffolds. Hybrid materials containing organic-inorganic units, ORMOCERs, fabricated with this process are tested for biocompatibility using various cell-types and compared with known standards such as polystyrene and ECM (Extracellular Matrix). Results show good adherence of different cells to these materials, and a growth rate comparable to bioactive materials. Structures with various surface topologies are developed and tested for preferential growth. The study is a first step towards developing bioactive and bioresorbable heterogeneous three-dimensional scaffolds. © 2005 materials Research Society.

关键词： Tissue

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