Masaaki Okubo

ORCID: 0000-0003-1321-916X
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About
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Research Areas
  • Catalytic Processes in Materials Science
  • Plasma Applications and Diagnostics
  • Helicobacter pylori-related gastroenterology studies
  • Industrial Gas Emission Control
  • Gastric Cancer Management and Outcomes
  • Plasma Diagnostics and Applications
  • Gas Sensing Nanomaterials and Sensors
  • Surface Modification and Superhydrophobicity
  • Aerosol Filtration and Electrostatic Precipitation
  • Vehicle emissions and performance
  • Characterization and Applications of Magnetic Nanoparticles
  • Epigenetics and DNA Methylation
  • Gastroesophageal reflux and treatments
  • Plasma and Flow Control in Aerodynamics
  • Esophageal Cancer Research and Treatment
  • Metastasis and carcinoma case studies
  • Advanced Combustion Engine Technologies
  • Cancer-related molecular mechanisms research
  • Diamond and Carbon-based Materials Research
  • Geomagnetism and Paleomagnetism Studies
  • Cancer-related gene regulation
  • Electrohydrodynamics and Fluid Dynamics
  • Combustion and Detonation Processes
  • Digestive system and related health
  • Eosinophilic Esophagitis

Fujita Health University
2014-2024

Osaka Prefecture University
2015-2024

Osaka Metropolitan University
2022-2024

Tokyo Metropolitan University
2024

Weatherford College
2021

Fujita Health University Hospital
2008-2017

Nippon Institute of Technology
2016

Tokyo Medical University Hospital
2015

Kanazawa Medical University
2009-2010

University Gastroenterology
2007-2009

Common single-nucleotide polymorphisms (SNPs) in microRNAs (miRNA) have been shown to be associated with susceptibility several human cancers. We evaluated the associations of three SNPs (rs11614913, rs2910164, and rs3746444) pre-miRNAs (miR-196a2, miR-146a, miR-499) risk gastric cancer (GC) peptic ulcer diseases, severity Helicobacter pylori-induced gastritis Japanese population.The rs11614913 (C>T), rs2910164 (G>C), rs3746444 (A>G) were genotyped 552 GC, 697 non-cancer subjects, including...

10.1111/j.1523-5378.2010.00806.x article EN Helicobacter 2010-11-14

The plasma-chemical hybrid process developed was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system other technologies for NO/sub x/ removal from flue gas emissions. A series of experiments performed to quantify all reaction by-products such as N/sub 2/O, CO, HNO/sub 2/, 3/, 3//sup -/ evaluate efficiency. optimum plasma reactor its operating characteristics were investigated regard efficiency using ordinary ferroelectric...

10.1109/28.952526 article EN IEEE Transactions on Industry Applications 2001-01-01

In the flue emission from an internal combustion system using diffusing such as coal or oil fuel boiler, incinerator, diesel engine, around 10% oxygen is usually included. It difficult to reduce NO/sub x/ in completely catalysts plasma alone because part of oxidized under O/sub 2/-rich environment. order overcome these difficulties, we proposed a new after treatment included exhaust gas nonthermal (NTP) desorption and reduction. this system, exchangeable adsorbent columns are equipped....

10.1109/tia.2005.851565 article EN IEEE Transactions on Industry Applications 2005-07-01

TP53 gene is frequently mutated in gastric cancer (GC), but the relationship with clinicopathological features and prognosis conflicting. Here, we screened mutation spectrum of 214 GC patients relation to their prognosis.TP53 nonsilent mutations were detected 80 cases (37.4%), being occurred as C:G T:A single nucleotide transitions at 5'-CpG-3' sites. more differentiated histologic type than undifferentiated early stage (48.6% vs. 7%, P=0.0006), while correlated venous invasion among...

10.18632/oncotarget.9770 article EN Oncotarget 2016-06-01

The two-dimensional flow interaction between the primary and secondary (often called an electric wind or ionic wind) in wire-duct electrostatic precipitator (ESP) has been investigated theoretically experimentally past. However, analysis was limited to two-dimensional, which is acceptable only for positive polarity small tuft spacing. negative corona, commonly used industrial ESPs, generates tufts along corona wire point coronas on discharge requires three-dimensional analysis....

10.1109/tia.2003.818983 article EN IEEE Transactions on Industry Applications 2003-11-01

In a previous study, we investigated the simultaneous removal of NO/sub x/ and SO/sub using plasma-chemical hybrid process showed nearly 100% removal. this x/, particulates single-stage wet-type plasma reactor. This reactor consists discharge wire pyrex cylinder, wrapped by copper mesh where Na/sub 2/SO/sub 3/ NaOH solutions flow along inner wall cylinder from top to bottom Particulates are charged pulse corona collected on wall, then removed flow. method is effective for extremely low....

10.1109/tia.2002.802919 article EN IEEE Transactions on Industry Applications 2002-09-01

In order to develop an economical volatile organic compound (VOC) removal process, a concentration technique using nonthermal plasma combined with adsorption process is investigated. Toluene-one of the most commonly used VOCs-is used, and optimization desorption The effects toluene adsorbent regeneration are investigated by varying methods: closing method, in which carrier gas stopped flowing during portion time, nonclosing method. As result, method favored regard parameters such as...

10.1109/tia.2008.2009476 article EN IEEE Transactions on Industry Applications 2009-01-01

A surface modification technique that improves the adhesion of fluorocarbon polymer films such as polytetrafluoroethylene (PTFE), perfluoroalkoxy fluoroplastics, and polychlorotrifluoroethylene is developed using argon at atmospheric pressure acrylic acid vapor nonthermal plasma. The results T-type peeling test show strength treated PTFE film approximately 70 times greater than untreated film. From X-ray photoelectron spectroscopy scanning electron microscope analyses, it confirmed chemical...

10.1109/tia.2010.2057492 article EN IEEE Transactions on Industry Applications 2010-07-21

In this study, we propose a plasma-chemical hybrid NOx removal process using nonthermal plasma for the treatment of flue gases emitted from glass melting furnaces; is demonstrated through laboratory-scale model experiment conducted semi-dry desulfurization apparatus. The performance system simultaneous SO2 and investigated. As result, NO effectively oxidized to NO2 by injecting ozone into spray region efficiencies 90% 50% were obtained NOx, respectively. addition, efficiency 84% was achieved.

10.1080/01919512.2015.1115335 article EN Ozone Science and Engineering 2015-11-16

Fusobacterium enrichment has been associated with colorectal cancer development. Ulcerative colitis (UC) tumorigenesis is characterized as high degree of methylation accumulation through continuous colonic inflammation. The aim this study was to investigate a potential link between and DNA in the inflammatory mucosa UC.In candidate analysis, inflamed from 86 UC patients were status panel related 24 genes. In genome-wide an Infinium HumanMethylation450 BeadChip array utilized characterize...

10.18632/oncotarget.18716 article EN Oncotarget 2017-06-27

The gas flow rates for hazardous air pollutant emissions are generally large and their concentrations low (in parts per million levels). When we try to directly treat the rate concentration exhaust gas, size of equipment becomes large, resulting in high operating cost. objective this study is convert with into one small flowrate by desorbing absorbed from absorbent pellets packed inside a barrier-type packed-bed nonthermal plasma reactor. In paper, especially focus on difficulties treating...

10.1109/tia.2002.802916 article EN IEEE Transactions on Industry Applications 2002-09-01

Regulations regarding automotive diesel engine emissions become more severe every year, and it is difficult to meet the requirements with only combustion improvement techniques. More effective post-processing technology desired especially for particulate matter (PM), such as carbon soots. Although use of a ceramic filter (DPF) now leading PM removal, problem exists soot removal or regeneration at low temperature, cold start brake operation. In present study, DPF investigated using indirect...

10.1109/tia.2004.836129 article EN IEEE Transactions on Industry Applications 2004-11-01
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