Yasuo Takahashi

ORCID: 0000-0002-4960-2307
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About
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Research Areas
  • Water Treatment and Disinfection
  • Semiconductor materials and devices
  • Land Use and Ecosystem Services
  • Conservation, Biodiversity, and Resource Management
  • Urban and spatial planning
  • Insect-Plant Interactions and Control
  • Environmental Chemistry and Analysis
  • Silicon Nanostructures and Photoluminescence
  • Metal and Thin Film Mechanics
  • Plant Virus Research Studies
  • Silkworms and Sericulture Research
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Agriculture, Soil, Plant Science
  • Advancements in Semiconductor Devices and Circuit Design
  • Electronic Packaging and Soldering Technologies
  • Rice Cultivation and Yield Improvement
  • Pesticide and Herbicide Environmental Studies
  • Agriculture and Biological Studies
  • Insect and Pesticide Research
  • Environmental Conservation and Management
  • Quantum and electron transport phenomena
  • Silicon and Solar Cell Technologies
  • Nematode management and characterization studies
  • Ecology and Vegetation Dynamics Studies
  • Animal Nutrition and Physiology

Institute for Global Environmental Strategies
2019-2024

Hokkaido University
2004-2021

Osaka University
1994-2015

Tokyo University of Science
2008-2015

Ministry of Land, Infrastructure, Transport and Tourism
2014

Hitachi (Japan)
1992-2013

University of Kent
2012

The University of Tokyo
2001-2008

Tokyo Institute of Technology
2004-2007

Gunma University
1987-2007

Effective policies to halt biodiversity loss require knowing which anthropogenic drivers are the most important direct causes. Whereas previous knowledge has been limited in scope and rigor, here we statistically synthesize empirical comparisons of recent driver impacts found through a wide-ranging review. We show that land/sea use change dominant worldwide. Direct exploitation natural resources ranks second pollution third; climate invasive alien species have significantly less than top two...

10.1126/sciadv.abm9982 article EN cc-by-nc Science Advances 2022-11-09

We observe a quantized current due to single-electron transfer in small charge-coupled device, which consists of narrow Si-wire channel with fine gates; the gate is used form tunable barrier potential. By modulating two potentials under gates phase-shifted pulse voltages, numbers electrons are injected into and extracted from charge island sandwiched by barriers. Current plateaus clearly observed at 20 K frequencies up 100 MHz level 16 pA.

10.1063/1.1650036 article EN Applied Physics Letters 2004-02-12

Cultural Ecosystem Services (CES) are non-material benefits that indispensable for the health and well-being of communities. CES often spatially explicit fluctuate according to knowledge, beliefs, perception users location. Therefore, understanding spatial patterns perceived by people from different backgrounds is important decision-makers carry out proactive landscape planning. In this study, we investigated differences in between residents tourists on Ishigaki Island, Japan. The study...

10.1016/j.ecoser.2023.101520 article EN cc-by-nc-nd Ecosystem Services 2023-02-26

Abstract Globally, urbanization constitutes one of the major underlying drivers global ecological degradation. Hence, deurbanization, i.e., demographic shift from urban to distant rural areas in a way that increases quality life (QoL), can be key pathways address this challenge. In study, we investigated contribution nature and other types capital QoL people’s decision migrate by studying residents Hokuto City, popular urban-to-rural migration destination Japan. An integrated analysis 414...

10.1007/s11625-023-01427-9 article EN cc-by Sustainability Science 2024-01-12

Reactions of sunscreen agents, octyl dimethyl-p-aminobenzoate (ODPABA) and octyl-p-methoxycinnamate (OMC), with hypochlorite in aqueous solution were investigated under the conditions that simulate swimming pool disinfection sites. Chlorination byproducts determined by GC-MS. At a concentration 9 μM, ODPABA reacted rapidly free chlorine buffered at pH 7.0, OMC reasonably slowly same condition. produced chlorine-substituted compounds as intermediates, which decomposed to cleavaged products...

10.1248/jhs.55.363 article EN JOURNAL OF HEALTH SCIENCE 2009-01-01

Abstract Nobiletin (NOB), a polymethoxyflavonoid, is an effective anti‐inflammatory and chemopreventive phytochemical found in citrus fruits. We compared the absorption metabolism characteristics of NOB with those luteolin (LT) male SD rats. Each flavonoid (67.1 μmol/kg body weight) was given separately by gastric intubation, then concentrations were measured at 1, 4, 24 hours after administration. In digestive organs, showed notable tendency for localizing into mucous membrane muscularis...

10.1002/biof.5520160303 article EN BioFactors 2002-01-01

Self-diffusion of ion-implanted Si30 in SiO2 formed directly on Si substrates by thermal oxidation was studied as a function the temperature and thickness (200, 300, 650 nm). The diffusion coefficient increases about an order magnitude with decreasing from to 200 nm when silicon–nitride capping layers are placed top SiO2, i.e., distance between diffusers Si/SiO2 interface has strong influence. Because stress nitride estimated for such change diffusivity is unrealistically large, species,...

10.1063/1.1625775 article EN Applied Physics Letters 2003-11-07

Abstract Fallen logs are the main regeneration sites for Abies sachalinensis (Sachalin fir) in subboreal forests Japan. We surveyed spatial genetic structure of different demographic stages a 4.29‐ha natural population A. . Genetic was significant at short distances throughout all this wind‐dispersed conifer. To evaluate effects fallen‐log‐dependent recruitment on demography and structure, we conducted parentage analysis offspring with highly polymorphic nuclear simple sequence repeat...

10.1111/j.1365-294x.2008.03802.x article EN Molecular Ecology 2008-05-16

10.1016/0022-5088(74)90035-6 article EN Journal of the Less Common Metals 1974-08-01

The polymethoxyflavonoid (PMF), nobiletin (NOB), specifically occurs in citrus fruits, and is currently believed to be a promising anti-inflammatory anti-tumor promoting agent. In the present study, we investigated vitro absorption metabolism of NOB compared them with those polyhydroxyflavonoid (PHF), luteolin (LT). preferentially accumulated differentiated Caco-2 cell monolayer, which model for small intestinal epithelial cells, while LT did not. Treatment rat liver S-9 mixture led...

10.1271/bbb.65.194 article EN Bioscience Biotechnology and Biochemistry 2001-01-01

Abstract Trade-offs in nature’s contributions to people (NCP), particularly material NCP versus regulating and non-material NCP, continue rise. Socio-ecological production landscapes seascapes (SEPLS) represent harmonious human–nature interactions resulting positive outcomes for both biodiversity human well-being, thus implying synergies among multiple are possible. In case studies of ten projects selected from hotspots under the GEF-Satoyama Project, we investigated whether how exist within...

10.1007/s11625-021-00927-w article EN cc-by Sustainability Science 2021-03-01

Basic information on the molecular weights and structures of poly(p-phenylene) PPP, poly(m-phenylene) PMP, poly(thiophene-2,5-diyl) PTh, related copolymers has been obtained. PPPs prepared by a Ni-catalyzed dehalogenative polycondensation p-C6H4Br2 with Mg (PPP(Ni)) an oxidative polymerization benzene using CuCl2 (PPP(Cu)) became soluble in DMF after nitration. The nitration proceeded essentially without crosslinking, GPC analysis gave Mn values 8300 6100 for nitrated PPP(Ni) PPP(Cu),...

10.1021/ma0626517 article EN Macromolecules 2007-06-27

The feasibility of a “direct injection scheme” using Nd–yttritium–aluminum–garnet laser has been studied experimentally. relationship between charge distribution and power density was measured. obtained yield rate C6+ 46.8% at the peak current pulse with 1.6×1011 W/cm2 intensity. dependence distance from target this intensity will be 60 mA φ4.8 mm extraction aperture. It found input beam condition simulation by code PTEQ–HI that high (from 12 to 28.6 mA) can accelerated TIT–RFQ.

10.1063/1.1691513 article EN Review of Scientific Instruments 2004-05-01

Overlapping genes are relatively common in DNA and rNA viruses. there several examples bac-terial eukaryotic genomes, but, general, overlapping quite rare organisms other than have been a few reports of mammalian genomes. the present study identified all loci exons every chromosome human genome using public database. total number on same opposite strands was 949 743, respectively. similarly, chromosome, instances which two were located strand similar to 2 observed strands, except for 5....

10.59566/ijbs.2007.3014 article EN International Journal of Biomedical Science 2007-03-15
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