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Institution

National Institute of Advanced Industrial Science and Technology

GovernmentTsukuba, Ibaraki, Japan
About: National Institute of Advanced Industrial Science and Technology is a government organization based out in Tsukuba, Ibaraki, Japan. It is known for research contribution in the topics: Catalysis & Thin film. The organization has 22114 authors who have published 65856 publications receiving 1669827 citations. The organization is also known as: Sangyō Gijutsu Sōgō Kenkyū-sho.
Topics: Catalysis, Thin film, Carbon nanotube, Hydrogen, Laser


Papers
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Journal ArticleDOI
TL;DR: The results suggest that putative orthologs of NST1 and NST3 are also key regulators of the formation of secondary walls in woody plants and could be used as a tool for the genetic engineering of wood and its derivatives.
Abstract: Wood is formed by the successive addition of secondary xylem, which consists of cells with a conspicuously thickened secondary wall composed mainly of lignin and cellulose. Several genes involved in lignin and cellulose biosynthesis have been characterized, but the factors that regulate the formation of secondary walls in woody tissues remain to be identified. In this study, we show that plant-specific transcription factors, designated NAC SECONDARY WALL THICKENING PROMOTING FACTOR1 (NST1) and NST3, are key regulators of the formation of secondary walls in woody tissues of Arabidopsis thaliana. In nst1-1 nst3-1 double knockout plants, the secondary wall thickenings in interfascicular fibers and secondary xylem, except for vascular vessels, were completely suppressed without affecting formation of cells destined to be woody tissues. Conversely, as shown previously for NST1, overexpression of NST3 induced ectopic secondary wall thickenings in various aboveground tissues. Furthermore, the expression of chimeric repressors derived from NST1 and NST3 suppressed secondary wall thickenings in the presumptive interfascicular fibers. Because putative orthologs of NST1 and NST3 are present in the genome of poplar, our results suggest that they are also key regulators of the formation of secondary walls in woody plants and could be used as a tool for the genetic engineering of wood and its derivatives.

726 citations

Journal ArticleDOI
TL;DR: A coherent precessional magnetization switching using electric field pulses in nanoscale magnetic cells with a few atomic FeCo (001) epitaxial layers adjacent to a MgO barrier is demonstrated and the realization of bistable toggle switching using the coherentPrecessions is demonstrated.
Abstract: The magnetization direction of a metallic magnet has generally been controlled by a magnetic field or by spin-current injection into nanosized magnetic cells. Both these methods use an electric current to control the magnetization direction; therefore, they are energy consuming. Magnetization control using an electric field is considered desirable because of its expected ultra-low power consumption and coherent behaviour. Previous experimental approaches towards achieving voltage control of magnetization switching have used single ferromagnetic layers with and without piezoelectric materials, ferromagnetic semiconductors, multiferroic materials, and their hybrid systems. However, the coherent control of magnetization using voltage signals has not thus far been realized. Also, bistable magnetization switching (which is essential in information storage) possesses intrinsic difficulties because an electric field does not break time-reversal symmetry. Here, we demonstrate a coherent precessional magnetization switching using electric field pulses in nanoscale magnetic cells with a few atomic FeCo (001) epitaxial layers adjacent to a MgO barrier. Furthermore, we demonstrate the realization of bistable toggle switching using the coherent precessions. The estimated power consumption for single switching in the ideal equivalent switching circuit can be of the order of 10(4)k(B)T, suggesting a reduction factor of 1/500 when compared with that of the spin-current-injection switching process.

725 citations

Journal ArticleDOI
TL;DR: The available methods are critically reviewed on the basis of the mechanisms and dynamics of antioxidant action, and the methods are proposed to assess the capacity of radical scavenging and inhibition of lipid peroxidation both in vitro and in vivo.

724 citations

Journal ArticleDOI
TL;DR: In this article, a systematic study for numerical atomic basis orbitals ranging from H to Kr is presented, which can be used in large scale electronic structure calculations based on density functional theories (DFT).
Abstract: We present a systematic study for numerical atomic basis orbitals ranging from H to Kr, which could be used in large scale $\mathrm{O}(N)$ electronic structure calculations based on density-functional theories (DFT). The comprehensive investigation of convergence properties with respect to our primitive basis orbitals provides a practical guideline in an optimum choice of basis sets for each element, which well balances the computational efficiency and accuracy. Moreover, starting from the primitive basis orbitals, a simple and practical method for variationally optimizing basis orbitals is presented based on the force theorem, which enables us to maximize both the computational efficiency and accuracy. The optimized orbitals well reproduce convergent results calculated by a larger number of primitive orbitals. As illustrations of the orbital optimization, we demonstrate two examples: the geometry optimization coupled with the orbital optimization of a ${\mathrm{C}}_{60}$ molecule and the preorbital optimization for a specific group such as proteins. They clearly show that the optimized orbitals significantly reduce the computational efforts, while keeping a high degree of accuracy, thus indicating that the optimized orbitals are quite suitable for large scale DFT calculations.

723 citations

Journal ArticleDOI
TL;DR: In this article, Nitrogen-enriched nonporous carbon materials derived from melamine-mica composites are subjected to ammonia treatment to further increase the nitrogen content and are tested as electrodes for supercapacitors, and in acidic or basic electrolytes, the gravimetric capacitance of treat samples is three times higher than that of untreated samples.
Abstract: Nitrogen-enriched nonporous carbon materials derived from melamine-mica composites are subjected to ammonia treatment to further increase the nitrogen content. For samples preoxidized prior to the ammonia treatment, the nitrogen content is doubled and is mainly incorporated in pyrol-like groups. The materials are tested as electrodes for supercapacitors, and in acidic or basic electrolytes, the gravimetric capacitance of treat samples is three times higher than that of untreated samples. This represents a tenfold increase of the capacitance per surface area (3300 mu F cm(-2)) in basic electrolyte. Due to the small volume of the carbon materials, high volumetric capacitances are achieved in various electrolytic systems: 280 F cm(-3) in KOH, 152 F CM(-3) in H(2)SO(4), and 92 F cm(-3) in tetraethylammonium tetrafluoroborate/propylene carbonate.

717 citations


Authors

Showing all 22289 results

NameH-indexPapersCitations
Takeo Kanade147799103237
Ferenc A. Jolesz14363166198
Michele Parrinello13363794674
Kazunari Domen13090877964
Hideo Hosono1281549100279
Hideyuki Okano128116967148
Kurunthachalam Kannan12682059886
Shaobin Wang12687252463
Ajit Varki12454258772
Tao Zhang123277283866
Ramamoorthy Ramesh12264967418
Kazuhito Hashimoto12078161195
Katsuhiko Mikoshiba12086662394
Qiang Xu11758550151
Yoshinori Tokura11785870258
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202367
2022265
20213,064
20203,389
20193,257
20183,181