Takashi Yokoyama

ORCID: 0000-0003-4527-1800
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About
Contact & Profiles
Research Areas
  • Electrical and Thermal Properties of Materials
  • Electrochemical Analysis and Applications
  • Analytical Chemistry and Chromatography
  • Analytical Chemistry and Sensors
  • Ferroelectric and Piezoelectric Materials
  • Microwave Dielectric Ceramics Synthesis
  • Analytical chemistry methods development
  • Gas Sensing Nanomaterials and Sensors
  • Metal complexes synthesis and properties
  • Pigment Synthesis and Properties
  • Advanced Thermoelectric Materials and Devices
  • Electrochemical sensors and biosensors
  • Diamond and Carbon-based Materials Research
  • Boron and Carbon Nanomaterials Research
  • Thermal properties of materials
  • Corrosion Behavior and Inhibition
  • Neuroblastoma Research and Treatments
  • Molecular Sensors and Ion Detection
  • Chemical Synthesis and Characterization
  • Microfluidic and Capillary Electrophoresis Applications
  • Semiconductor materials and interfaces
  • Metallic Glasses and Amorphous Alloys
  • Concrete Corrosion and Durability
  • Magnetism in coordination complexes
  • Transition Metal Oxide Nanomaterials

NGK Insulators (Japan)
2025

Okayama University of Science
2006-2021

Mitsubishi Heavy Industries (Japan)
2021

Takasago (Japan)
2021

Japan Aerospace Exploration Agency
2020

Yokohama National University
2005-2016

Nagoya Institute of Technology
2013-2016

National University
2011

National Institute of Advanced Industrial Science and Technology
2005-2007

The University of Tokyo
1975-2003

gamma-Aminobutyric acid (GABA) is known to be involved in the regulation of blood pressure by modulating neurotransmitter release central and peripheral sympathetic nervous systems. This study investigated antihypertensive effect green tea rich GABA (GABA-rich tea) young old Dahl salt-sensitive (S) rats. GABA-rich was made fermenting fresh leaves under nitrogen gas. In experiment 1, 21 11-month-old rats, fed a 4% NaCl diet for 3 weeks, were given water (group W), an ordinary solution T), or...

10.1016/0895-7061(94)00141-w article EN American Journal of Hypertension 1995-01-01

Telomeres are the physical ends of eukaryotic chromosomes. In view reports reduction telomeric repeats in human malignant tumors, we measured lengths 55 primary neuroblastomas. The average these tumors fell a wide range (from 1.1 kb to more than 23 kb) relative those ganglioneuromas and normal peripheral mononuclear cells. was significantly correlated with advanced stages tumor development, poor prognosis, increased S‐phase fractions On other hand, three cases Stage IV‐S showed low...

10.1111/j.1349-7006.1992.tb00081.x article EN other-oa Japanese Journal of Cancer Research 1992-02-01

Performance characteristics of a laser-based instrument called the electrical-single particle aerodynamic relaxation time (E-SPART) analyzer for measuring size and electrostatic charge distribution particles in real on single-particle basis are described. Applications this along with experimental data characterization different toners their distributions presented, including operational principles methods acquisition. Size ranged from 2.0 to 20.0 mu m diameter, charge-to-mass 0 +or-20 C/g....

10.1109/28.85472 article EN IEEE Transactions on Industry Applications 1991-01-01

Preparation of spinel-type oxides, Mn (2- X ) Co 2 Ni (1- O 4 (0≦ ≦1), and their electrical properties were investigated. Die-pressed oxides (25 mm diam. ×4 mm), containing metals with desired molar ratios, heated to 1400° C, held at that temperature for 3 h in nitrogen. The sintered specimens quenched 800° C then oxidized 95 air completely convert them into oxides. lattice constants the spinels decreased increasing . Two turning points, =0.5 0.84, observed. Based on these results, cation...

10.1143/jjap.35.5775 article EN Japanese Journal of Applied Physics 1996-11-01

Preparation of DPPC lipid monolayer in water trough has been done by dropping method and compared with compression method. Monolayer was studied surface pressure isotherm, fluorescence microscopy, Brewster angle infrared external reflection spectroscopy. Results these measurements showed that gave better results to In method, transition from liquid expanded state condensed is gradual sharp one compressed During formation, adjustment interaction between hydrophilic part among hydrophobic...

10.4236/jbpc.2013.44016 article EN Journal of Biophysical Chemistry 2013-01-01

10.1023/a:1004633610231 article EN Journal of Materials Science 1999-01-01

Background Neuroblastoma shows remarkable heterogeneity, resulting in favorable and unfavorable outcomes. It is well known that almost all cases with MYCN amplification have a poor prognosis. We previously reported tumors show high telomerase activity, whereas low or nil activity. also found the neuroblastoma often loss of heterozygosity (LOH) at MYCL locus. Procedure To clarify biological clinical profiles genetic abnormalities short arm chromosome 1, we performed deletion mapping on 1p 92...

10.1002/1096-911x(20010101)36:1<67::aid-mpo1017>3.0.co;2-s article EN Medical and Pediatric Oncology 2001-01-01

Conductance measurements of the complex R,S,R,S-[NiL][ClO4]2(L = 1,4,8,11-tetramethyl-1,4,8,11-tetra-azacyclotetradecane), in mixed solvents N,N-dimethylacetamide (dma) and acetonitrile with nitrobenzene, which are iso-relative permittivity, have shown that first ion-pair formation constant (1 190 dm3 mol–1) nitrobenzene much lower basicity decreases increasing fraction dma MeCN, although MeCN is axially bonded to nickel but hardly co-ordinated. The axial co-ordination constant,...

10.1039/dt9880001935 article EN Journal of the Chemical Society. Dalton transactions 1988-01-01
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