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Evaluation of Preparation Methods for Scanning Electron Microscopic Observation of Plant Protoplasts
MAEDA,Eizo,SATO,Tadahiko,Oh,Chang Kwon,TANIGUCHI,Takeshi,MIYAKE,Hiroshi 東亞大學校附設遺傳工學硏究所 1996 遺傳工學硏究 Vol.- No.3
佐藤忠彦·權 五昌**·三宅 博·谷口 武·前田英三 (名古屋大學農學部·**韓國東亞大學校農科大學) 要 旨:ペチュニアとイネのプロトプラストを用いて, 走査電子顯微鏡の試料調製法の檢討を行つた. アルコ-ル脫水處理中に生じるプロトプラストの形狀變化を??減するための固定條件を調査した. その結果, 固定條件の違いにより, 脫水處理により生じゐプロトプラストの體積の減少にかなりの差が認められ, グルタルアルデヒド固定, グルタルアルデヒド·オスミウム固定, グルタルアルデヒド·タンニン酸·オスミウム固定の順に, 體積の減少が少なくなつた, グルタルアルデヒド單獨固定の場合に, ペチュニア葉由來プロトプラストの葉綠體の綠色は, アルコ-ル脫水により脫色した. グルタルアルデヒド·タンニン酸·オスミウムで固定すゐと, ペチュニアとイネのプロトプラストの良く保存された走査電子顯微鏡像が得られた. Preparation methods for scanning electron microscopy (SEM) were studied with petunia and rice protoplasts. Fixation schedules to sustain protoplast size during alcohol dehydration were examined. When the different fixations were compared, the decrease in protoplast volume was observed to a variable extent during the dehydration process. The extent of volume decrease was reduced in order of glutaraldehyde, glutaraldehyde-osmium tetroxide, and glutaraldehyde-tannic acid-osmium tetroxide schedules. When fixed only with glutaraldehyde, the green color of the chloroplast in petunia leaf protoplasts was lost during alcohol dehydration. Well-defined scanning electron micrographs of petunia and rice protoplasts were obtained using a glutaraldehyde-tannic acid-osmium tetroxide schedule.
Maeda, Yutaka,Higo, Junki,Amagai, Yuri,Matsui, Jun,Ohkubo, Kei,Yoshigoe, Yusuke,Hashimoto, Masahiro,Eguchi, Kazuhiro,Yamada, Michio,Hasegawa, Tadashi,Sato, Yoshinori,Zhou, Jing,Lu, Jing,Miyashita, Tok American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.16
<P>This report describes a helicity-selective photoreaction of single-walled carbon nanotubes (SWNTs) with disulfide in the presence of oxygen. The SWNTs were characterized using absorption, photoluminescence (PL), Raman, and X-ray photoelectron spectroscopy, scanning electron microscopy, and current–voltage (<I>I</I>–<I>V</I>) measurements. Results showed remarkable helicity-selective (metallic SWNTs/semiconducting SWNTs and diameter) functionalization of SWNTs. The reaction rate decreases in the order of metallic SWNTs > semiconducting SWNTs and small-diameter SWNTs > large-diameter SWNTs. Control experiments conducted under various experimental conditions and ESR and femtosecond laser flash photolysis measurements revealed that the helicity-selective reaction proceeds via a photoinduced electron transfer reaction. The PL and <I>I</I>–<I>V</I> measurements showed that the photoreaction is effective not only to control SWNT conductivity but also for the band gap modulation of semiconducting SWNTs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-16/ja402199n/production/images/medium/ja-2013-02199n_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja402199n'>ACS Electronic Supporting Info</A></P>
The Development of the Totalized Hydrogen Energy Utilization System for Commercial Buildings
Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Tange, Manabu,Kawakami, Yoshiaki,Kato, Atsushi,Masuda, Masao The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
We have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for applying to commercial buildings. THEUS consists of fuel cells, water electrolyzers, metal hydride tanks and their auxiliaries. We evaluated the energy saving of the basic THEUS in view of an actual operation using thermal demand data of actual buildings. The THEUS have ability for achieving energy saving, in comparison with an ice storage system for cooling demand. We have developed the hydrogen storage system using metal hydride and unitized reversible cell (URC) combine the functionality of a fuel cell and an electrolyzer in a single device, these are important components of THEUS. The metal hydride tank designed and manufactured to evaluate that we assumed actual operation in the experiments. We developed the numerical simulation code, and simulation results are in good agreement with experimental data. The simulation about two tanks system was done by using this code. The heat utilization can be improved greatly. To achieve URC commercial use, improvement of durability was examined. It confirmed that our URC had durability for several thousand hours.
Maeda, Tetsuhiko,Nishida, Keiichi,Hasegawa, Yasuo,Kawakami, Yoshiaki,Masuda, Masao The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
Authors have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for load leveling and stabilizing the grid system. THEUS consists of fuel cells, water electrolyzers, hydrogen storage and their auxiliary machinery. The basic operation for load leveling is as follows: In the nighttime, it produces hydrogen through water electrolysis by using low-cost electric power and stores the hydrogen. In the daytime, it conducts fuel cell generation using the stored hydrogen to meet the demand. Hydrogen storage equipment is the core of THEUS. In this paper, the metal hydride tank was chosen as hydrogen storage. The hydrogen desorption process is endothermic reaction. It is possible to use the cool heat for air conditioning. It is necessary to develop a useful numerical simulation code for not only the operation method but also the optimization of the structure of the tank. We developed the simulation code. The validity of the code has been improved by comparing with experimental results. Concretely, the following points were considered. (1)The thermal capacity of the tank. (2)Heat loss to the outside. (3)The copper plate effect. The simulation results become in good agreement with experimental results. And to achieve hydrogen high flow rate, new design tank performance was investigated.
Logic Operations of Chemically Assembled Single-Electron Transistor
Maeda, Kosuke,Okabayashi, Norio,Kano, Shinya,Takeshita, Shuhei,Tanaka, Daisuke,Sakamoto, Masanori,Teranishi, Toshiharu,Majima, Yutaka American Chemical Society 2012 ACS NANO Vol.6 No.3
<P>Double-gate single-electron transistors (SETs) were fabricated by chemical assembling using electroless gold-plated nanogap electrodes and chemisorbed chemically synthesized gold nanoparticles. The fabricated SET showed periodic and stable Coulomb oscillations under application of voltages of both gates. The sole SET also exhibited all two-input logic operations?XOR, XNOR, NAND, OR, NOR, and AND?with an on/off ratio of 10<SUP>2</SUP>. This demonstrates the potential of chemical assembling to give highly stable SETs exhibiting all logic operations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-3/nn3003086/production/images/medium/nn-2012-003086_0006.gif'></P>
Study of Flow Field and Pressure Distribution on a Rotor Blade of HAWT in Yawed Flow Conditions
Maeda, Takao,Kamada, Yasunari,Okada, Naohiro,Suzuki, Jun Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.4
This paper describes the flow field and the blade pressure distribution of a horizontal axis wind turbine in various yawed flow conditions. These measurements were carried out with 2.4m-diameter rotor with pressure sensors and a 2-dimensional laser Doppler velocimeter for each azimuth angle in a wind tunnel. The results show that aerodynamic forces of the blade based on the pressure measurements change according to the local angle of attack during rotation. Therefore the wake of the yawed rotor becomes asymmetric for the rotor axis. Furthermore, the relations between aerodynamic forces and azimuth angles change according to tip speed ratio. By the experimental analysis, the flow field and the aerodynamic forces for each azimuth angle in yawed flow condition were clarified.
Maeda, Minoru,Choi, Seyong Elsevier 2019 Journal of alloys and compounds Vol.787 No.-
<P><B>Abstract</B></P> <P>Carbon-based organic molecular gas is a well-known chemical agent for controlling inorganic structures of MgB<SUB>2</SUB> single-crystal material. The utilization of such a gas can also be applied to polycrystalline materials. So far, however, few studies have dealt with the methodology and the effects, especially the structural mechanism. Herein, we have focused on hydrocarbon gas as an active carbon source for bulk and wire materials consisting of MgB<SUB>2</SUB> polycrystals. A starting material, amorphous or crystalline boron powder, was heated and exposed to the molecular gas in argon atmosphere. While the treated powder showed no major change in its structure, as characterized by X-ray diffraction profiles, its usage as a precursor powder for MgB<SUB>2</SUB> bulks resulted in a marked increase in the in-field critical current density. In order to examine and help identify the underlying causes, we have carried out further structural analysis with the Halder Wagner method, considering the integral breadths of peaks in the X-ray diffraction profiles. Finally, the gas treatment was found to improve the in-field transport properties, even for MgB<SUB>2</SUB> wires and densified conductors, which are made from crystalline boron powder.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon-based organic molecular gas can be utilized for MgB<SUB>2</SUB> bulk and wire materials. </LI> <LI> The precursor powder doesn't show major structural change after the gas treatment. </LI> <LI> In contrast, the structural order in MgB<SUB>2</SUB> lattice is lowered by the gas treatment. </LI> <LI> The modified structure leads to enhancement in the in-field transport property. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>