A5101846331- Vanadium and Halogenation Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Air Quality and Health Impacts
- Trace Elements in Health
- Heme Oxygenase-1 and Carbon Monoxide
- Metal complexes synthesis and properties
- Free Radicals and Antioxidants
- Air Quality Monitoring and Forecasting
- Atmospheric chemistry and aerosols
- Heavy Metal Exposure and Toxicity
- Advanced Glycation End Products research
- Vehicle emissions and performance
- Aerosol Filtration and Electrostatic Precipitation
- Cassava research and cyanide
- Skin Protection and Aging
- Electron Spin Resonance Studies
- Porphyrin and Phthalocyanine Chemistry
- Phytochemicals and Antioxidant Activities
- Antioxidant Activity and Oxidative Stress
- Nitric Oxide and Endothelin Effects
- Electrochemical Analysis and Applications
- Particle Dynamics in Fluid Flows
- Atmospheric aerosols and clouds
- Coagulation and Flocculation Studies
- Electrochemical sensors and biosensors
Hokkaido University of Science
2024-2025
National Institute of Technology
2025
National Institute of Advanced Industrial Science and Technology
2015-2024
Kyoto Pharmaceutical University
2003-2015
Suzuka University of Medical Science
2007-2014
Pharmaceutical Biotechnology (Czechia)
2014
University of Minnesota
2001-2009
Suzuka University
2008-2009
Hiroshima University
2009
NSF National Center for Atmospheric Research
2009
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHypervalent Iodine-Induced Nucleophilic Substitution of para-Substituted Phenol Ethers. Generation Cation Radicals as Reactive IntermediatesYasuyuki Kita, Hirofumi Tohma, Kenji Hatanaka, Takeshi Takada, Shigekazu Fujita, Shizue Mitoh, Hiromu Sakurai, and Shigenori OkaCite this: J. Am. Chem. Soc. 1994, 116, 9, 3684–3691Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1...
Diesel engines are known to emit high number concentrations of nanoparticles (diameter < 50 nm), but the physical and chemical mechanisms by which they form not understood. Information on composition is lacking because small size, low mass concentration, potential for contamination samples obtained standard techniques make difficult analyze. A nano-differential mobility analyzer was used size-select (mass median diameter ∼25−60 nm) from diesel engine exhaust subsequent analysis thermal...
Nitric oxide (NO) derived from endothelial NO synthase (eNOS) is regarded as a protective factor against atherosclerosis. Therefore, augmentation of eNOS expression or production by pharmacological intervention postulated to inhibit We crossed eNOS-overexpressing (eNOS-Tg) mice with atherogenic apoE-deficient (apoE-KO) determine whether overexpression in the endothelium could development After 8 weeks on high-cholesterol diet, atherosclerotic lesion areas aortic sinus were unexpectedly...
A simple dimensionless parameter, L , is shown to determine whether or not new particle formation can occur in the atmosphere on a given day. The criterion accounts for probability that clusters, formed by nucleation, will coagulate with preexisting particles before they grow detectable size. Data acquired an intensive atmospheric measurement campaign Atlanta, Georgia, during August 2002 (ANARChE) were used test validity of this criterion. Measurements included aerosol size distributions...
Nitric oxide (NO) derived from endothelial NO synthase (eNOS) is regarded as a protective factor against atherosclerosis. Therefore, augmentation of eNOS expression or production by pharmacological intervention postulated to inhibit We crossed eNOS-overexpressing (eNOS-Tg) mice with atherogenic apoE-deficient (apoE-KO) determine whether overexpression in the endothelium could development After 8 weeks on high-cholesterol diet, atherosclerotic lesion areas aortic sinus were unexpectedly...
To find antioxidative compounds present in plants, 65 types of plant extract were tested using the neotetrazolium method for evidence superoxide anion-scavenging effects and 7 extracts selected further investigation. The activity active-oxygen scavengers such as anion radicals, hydroxyl singlet oxygens lipid peroxides (Aeseclus hippocastanum L., Hamamelis virginiana L. Polygonum cuspidatum SIEB., Quercus robur Rosemarinous officinalis Salvia Sanguisorba L.) was examined detail by both ESR...
During the Atlanta ANARChE Study of July and August 2002, atmospheric aerosol size distributions from 3 to 2000 nm were measured continuously with 5‐min resolution. Sulfuric acid vapor concentrations also measured. regional nucleation events these data showed presence a mode that grew at rates ranging 20 h −1 . In this paper we compare modal growth calculated account for sulfuric condensation, intramodal coagulation particles, extramodal particles preexisting particles. Data collected during...
Mass concentrations of elemental carbon (EC) in fine mode and mixing ratios monoxide (CO) were measured at the University Tokyo campus different seasons 2003–2005. Measurements EC made using a semicontinuous thermal‐optical analyzer. The mass nonvolatile aerosol by calibrated scanning mobility particle sizer combined with heated inlet agreed independent measurements systematic difference about 4%, demonstrating that well represent those for EC. A majority therefore concentration was volume...
Mixing characteristics of particles different volatilities from a diesel engine were studied with two tandem differential mobility analyzers (TDMAs) and an aerosol particle mass analyzer (APM). In both TDMA systems, heater was located in the path between first second DMAs. Diesel exhaust that size-selected DMA passed through heater, change size due to loss volatile components determined by DMA. On basis volatility measurements, could be separated into overlapping modes varied peak diameter...
When rats with streptozotocin (STZ)-induced diabetes were given a daily intraperitoneal (i. p.) injection of VOSO4 (+4 oxidation state vanadium), their serum glucose dropped from hyperglycemic level to normal within 2 d and free fatty acid (FFA) also level. Vanadium was incorporated in most organs as well the adipose tissues, detected by neutron activation analysis (NAA). The mechanism for insulin-like action vanadium terms FFA release isolated rat adipocytes investigated : (1) Vanadyl (IV)...
We report the first direct, in situ measurements of chemical composition size‐segregated atmospheric nanoparticles 6–15 nm diameter range. These were made ambient aerosol directly following nucleation events Atlanta, Georgia, during 2002 Aerosol Nucleation and Real‐time Characterization Experiment (ANARChE). The recently developed Thermal Desorption Chemical Ionization Mass Spectrometer (TDCIMS) was used to make these featured a new inlet that delivers mass charged at sufficiently high rates...
A thermal desorption chemical ionization mass spectrometer has been developed for real time, quantitative analysis of ultrafine particles. The technique combines recently nanoparticle separation and collection techniques with highly sensitive provided by selected ion spectrometry. Sensitivity tests using laboratory-generated ammonium sulfate particles in the diameter range 10-16 nm show that can be quantified as little 1 pg collected aerosol mass. Such sensitivity makes this instrument...
Blood glucose levels of streptozocin (STZ)-induced diabetic rats dropped from hyperglycemic to hypoglycemic within 24-48h after treatment with vanadyl sulfate (VS) by intraperitoneal injection. Results the tolerance test indicated that diabetes was completely improved VS administration, but plasma insulin were still low. Determination both and total vanadium in VS-treated STZ-rats suggested is possibly a pharmacologically active form. Several complexes such as vanadyl-cysteine methyl ester...
When multiple instruments are used in tandem it is possible to obtain more complete information on particle transport and physicochemical properties than can be obtained with a single instrument. This article discusses measurements which submicrometer particles classified according electrical mobility then characterized one or additional methods. Measurement combinations that summarized here include plus mass, aerodynamic (or vacuum aerodynamic) diameter, integrated multiangle light...
The transformation of non-oxido V<sup>IV</sup>to oxido V<sup>IV</sup>species under physiological conditions is necessary for a vanadium compound to exhibit pharmacological anti-diabetic activity.