Takeshi Kubota

ORCID: 0000-0002-2007-0503
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About
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Research Areas
  • Magnetic Properties and Applications
  • Catalysis and Hydrodesulfurization Studies
  • Catalytic Processes in Materials Science
  • Microstructure and Mechanical Properties of Steels
  • Metallic Glasses and Amorphous Alloys
  • Nanomaterials for catalytic reactions
  • Magnetic Properties of Alloys
  • Muon and positron interactions and applications
  • Catalysis and Oxidation Reactions
  • Electrocatalysts for Energy Conversion
  • Advanced biosensing and bioanalysis techniques
  • DNA and Nucleic Acid Chemistry
  • RNA Interference and Gene Delivery
  • Shape Memory Alloy Transformations
  • Advanced Chemical Physics Studies
  • Atomic and Molecular Physics
  • Asymmetric Hydrogenation and Catalysis
  • Surface Chemistry and Catalysis
  • Sleep and Wakefulness Research
  • Electric Motor Design and Analysis
  • Catalysts for Methane Reforming
  • Electron and X-Ray Spectroscopy Techniques
  • Anesthesia and Sedative Agents
  • Metallurgy and Material Forming
  • Catalysis for Biomass Conversion

Keio University
2004-2024

Kanagawa Institute of Technology
2024

Shimane University
2012-2023

Hirosaki University
2004-2023

Research Institute of Innovative Technology for the Earth
2000-2021

Nara Institute of Science and Technology
2020

Osaka University
1977-2020

Seiwa Hospital
2005-2018

Japan Research Institute
2011-2018

University of Shimane
2000-2017

Technically important nanocrystalline soft magnetic alloys and their derivatives always include metal elements such as Nb, Zr, Mo, etc. and/or Cu to realize the nanostructure, which results in a remarkable decrease of saturation flux density (Bs) significant increase material cost. With aim solve serious problem, we successfully developed new FeSiBPCu alloys. The melt-spun Fe83.3–84.3Si4B8P3–4Cu0.7 (at%) have heterogeneous amorphous structures including large amount α-Fe clusters, 2–3 nm...

10.2320/matertrans.mer2008306 article EN MATERIALS TRANSACTIONS 2008-12-25

Intracellular signal transduction relies on spatial and temporal transmitter dynamics. To clarify the correlations of these molecules, multicolor-imaging has been widely used. However, in case applying multiple indicators a cell, spectral overlap prevents accurate quantitative analysis. Moreover, invasive (toxic) effect, localization, metabolism, as well photobleaching complicate situation. Here, we show that single-molecular multifluorescent probes can overcome problems. While intracellular...

10.1021/ja0528228 article EN Journal of the American Chemical Society 2005-07-14

The melt-spun Fe83.3–84.3Si4B8P3–4Cu0.7 alloys have a heterogeneous amorphous structure including large amount of α-Fe-like clusters. Compared with the FeSiB alloys, particle size rapidly decreases from several hundred nanometers to 2–3nm due proper amounts simultaneous P and Cu additions. By controlling crystallization process, homogeneous nanocrystalline composed by small α-Fe grains 10–17nm in diameter can be realized alloys. nanocrystallized show extremely high saturation magnetic flux...

10.1063/1.3058624 article EN Journal of Applied Physics 2009-02-10

Abstract Modification of Rh/C with Re species enabled chemoselective hydrogenolysis tetrahydropyran‐2‐methanol to 1,6‐hexanediol. In particular, the Rh–ReO x /C (Re/Rh ratio=0.25) catalyst gave a high yield 1,6‐hexanediol (84 %) and showed very low activity for overhydrogenolysis 1‐hexanol. Using same in tetrahydrofurfuryl alcohol also 1,5‐pentanediol (94 %). Characterization results indicate formation ReO clusters attached on surface Rh metal particles. This can cause synergy between Rh,...

10.1002/cctc.201000018 article EN ChemCatChem 2010-04-15

Recently, the energy crisis and continued growth in electrical power generation strongly demand minimization of wasteful dissipation. Magnetic core loss (W) is main source dissipation motors transformers. This requires development soft magnetic materials with low coercivity (Hc) high flux density (B). Fe-rich Fe85-86Si1-2B8P4Cu1 (at. %) alloy ribbons made from industrial raw (containing some impurities) 6 mm width have a heteroamorphous structure containing large number extremely small Fe...

10.1063/1.3535169 article EN Journal of Applied Physics 2011-03-17

The melt-spun Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">83.3-84.3</sub> Si xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> B xmlns:xlink="http://www.w3.org/1999/xlink">8</sub> P xmlns:xlink="http://www.w3.org/1999/xlink">3-4</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">0.7</sub> (at%) alloys have heterogeneous amorphous structures including a large amount of alpha-Fe clusters with less than 3 nm in size after rapid...

10.1109/tmag.2009.2023862 article EN IEEE Transactions on Magnetics 2009-09-25

Ultrasound-triggered drug delivery has been widely researched for its potential to improve the therapeutic efficacy of drugs. This paper presents release using hydrogel microbeads with enhancer efficient ultrasound-triggered delivery. By a centrifuge-based microfluidic device, drug-model-encapsulating calcium alginate containing tungsten particles high acoustic impedance were fabricated. Because work as enhancer, become have sensitivity ultrasound localized variation in so that rate models...

10.1016/j.matdes.2021.109580 article EN cc-by-nc-nd Materials & Design 2021-02-17

The role of intracellular magnesium ions is high interest in the fields pharmacology and cellular biology. To accomplish dynamic three-dimensional imaging Mg2+, there a strong desire for development optimized Mg2+ fluorescent probes. In this paper we describe design, synthesis, application three novel probes KMG-101, -103, -104. compounds series feature charged beta-diketone as binding site specific fluorescein residue fluorophore that can be excited with an Ar+ laser such widely used...

10.1021/ja049624l article EN Journal of the American Chemical Society 2004-11-23

Abstract (−)-DHMEQ, a newly designed NF-κB inhibitor, inhibited RANKL-induced osteoclast differentiation in mouse BMMs through downregulation of the induction NFATc1, an essential transcription factor osteoclastogenesis. Introduction: Bone destruction is often observed advanced case rheumatoid arthritis and neoplastic diseases, including multiple myeloma. Effective nontoxic chemotherapeutic agents are expected for suppression these bone destructions. RANKL induces activation...

10.1359/jbmr.041213 article EN Journal of Bone and Mineral Research 2005-04-01

Among many kinds of bulk metallic glasses (BMGs), Fe-based BMGs with good magnetic properties, high strength and low materials cost should have great potential for wide variety applications. However, the glass-forming metal elements such as Al, Ga, Nb, Mo, Y so forth in significantly decrease saturation magnetization (Js) which is a essential property soft also increase material cost.The coexistence Fe content ability (GFA) has been earnestly desired from academia to industry. We report...

10.2320/matertrans.mrp2007198 article EN MATERIALS TRANSACTIONS 2007-01-01

A colorful bunch: series of fluorescent probes designed on the basis fluorescence quenching caused by an excitonic interaction contain different dye moieties and fluoresce in various colors upon hybridization with their target nucleic acid. The picture shows simultaneous three nucleus a cell containing excess microRNA strands. Left: differential interference contrast image. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents...

10.1002/anie.200902000 article EN Angewandte Chemie International Edition 2009-07-27

Novel Mg2+ fluorescent molecular probes (KMG-20-AM and KMG-27-AM; where AM is an acetoxymethyl group) based on a coumarin possessing charged beta-diketone structure were designed synthesized. These produced red shift from 425 to 445 nm in the absorption spectra after formation of complex with Mg2+. The fluorescence these also showed 485 495 increasing intensity optimum experimental conditions excitation wavelength monitored 500 nm, functioned as indicator showing image presence "seesaw-type"...

10.1021/ac010914j article EN Analytical Chemistry 2002-02-09

Background Previous studies indicate that anesthesia and surgery induce an inflammatory reaction in alveolar macro phages. However,they filed to independently evaluate the relative contributions of factors including mechanical ventilation, general anesthesia, surgical stress. Therefore, authors tested hypothesis reactions at cellular level macrophages are induced within 2 h inhalation volatile anesthetics under ventilation. Methods After administration pentobarbital, rats were allocated...

10.1097/00000542-199907000-00027 article EN Anesthesiology 1999-07-01
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