Search results for: Masako Morishita

Items from 1 to 19 out of 19 results

article

Personal-level exposure to environmental temperature is a superior predictor of endothelial-dependent vasodilatation than outdoor-ambient level

Chinedu Ejike, Lu Wang, Mochuan Liu, Wei Wang, more

Journal of the American Society of Hypertension > 2017 > 11 > 11 > 746-753.e1

Environmental temperatures influence cardiovascular physiology. However, the majority of time is spent indoors, making outdoor-ambient temperatures inaccurate estimates of true exposures encountered by most individuals. We evaluated in 50 healthy adults the associations between previous 7-day outdoor-ambient (four occasions) and prior 24-hour personal-level (two occasions) environmental temperature...

article

Combustion synthesis of CeO2 nanoparticles for aging and inhalation exposure studies

Mohammad Fatouraie, W. Ethan Eagle, Dingsheng Li, Masako Morishita, more

Journal of Aerosol Science > 2017 > 106 > C > 24-33

The continuous production of an aerosol of CeO₂ nanoparticles is valuable for nanoparticle aging and inhalation exposure studies, compared with other synthesis processes that require subsequent handling and preparation of the aerosol which can alter nanoparticle properties. This paper describes a new method for producing CeO₂ nanoparticles and a novel facility where a combustion synthesis system was...

chapter

Cultural Environment for Social Learning and Adaptation in Different Countries - A Comparison of Minority Foreigners and Majority Foreigners

Masaaki Kurosu, Masako Morishita

Lecture Notes in Computer Science > Usability and Internationalization. Global and Local User Interfaces > Part I: Designing Global and Local Products and Services > 133-139

Before WWII, number of foreign people was not large in Japan. But after the war, it grew larger and now we have total of 2,011,555 foreigners (in 2005). There are some majority groups such as Koren (598,687), Chinese (519,561), Brazilian (302,080), and Filipinos (187,261). At the same time, there are minority groups such as Bangladeshi (9,707) and Iranian (5,769). Organizing local communities of such...

article

Acute increase in blood pressure during inhalation of coarse particulate matter air pollution from an urban location

J. Brian Byrd, Masako Morishita, Robert L. Bard, Ritabrata Das, more

Journal of the American Society of Hypertension > 2016 > 10 > 2 > 133-139.e4

Particulate matter (PM) air pollution is a leading global risk factor for cardiovascular mortality. Although exposure to fine PM <2.5 μm raises arterial blood pressure (BP), few studies have evaluated the impact of coarse PM which differs in size (2.5–10 μm), sources, and chemistry. Twenty-nine healthy adults (30.4 ± 8.2 years) underwent a randomized double-blind crossover study involving 2-hour...

article

Oil sands development and its impact on atmospheric wet deposition of air pollutants to the Athabasca Oil Sands Region, Alberta, Canada

Mary M. Lynam, J. Timothy Dvonch, James A. Barres, Masako Morishita, more

Environmental Pollution > 2015 > 206 > C > 469-478

Characterization of air pollutant deposition resulting from Athabasca oil sands development is necessary to assess risk to humans and the environment. To investigate this we collected event-based wet deposition during a pilot study in 2010–2012 at the AMS 6 site 30 km from the nearest upgrading facility in Fort McMurray, AB, Canada. Sulfate, nitrate and ammonium deposition was (kg/ha) 1.96, 1.60 and...

article

Trace elements and major ions in atmospheric wet and dry deposition across central Illinois, USA

Mary M. Lynam, J. Timothy Dvonch, Naima L. Hall, Masako Morishita, more

Air Quality, Atmosphere & Health > 2015 > 8 > 1 > 135-147

Measurements of trace elements and major ions in wet and dry deposition were made at eight sites in central Illinois for a 1-month period during the spring/summer season in 2011. During this study, daily-event wet deposition was collected using a commonly utilized sampling train, while 72-h dry deposition collection employed a newly developed artificial turf surrogate surface sampler designed to be...

article

Understanding Air Pollution and Cardiovascular Diseases: Is It Preventable?

Masako Morishita, Kathryn C. Thompson, Robert D. Brook

Current Cardiovascular Risk Reports > 2015 > 9 > 6 > 1-9

Fine particulate matter (<2.5 μm, PM _2.5 ) air pollution is a leading risk factor for morbidity and mortality worldwide. The largest portion of adverse health effects is from cardiovascular diseases. In North America, PM _2.5 concentrations have shown a steady decline over the past several decades; however, the opposite trend has occurred throughout much of the developing...

article

In vivo biodistribution and physiologically based pharmacokinetic modeling of inhaled fresh and aged cerium oxide nanoparticles in rats

Dingsheng Li, Masako Morishita, James G. Wagner, Mohammad Fatouraie, more

Particle and Fibre Toxicology > 2015 > 13 > 1 > 1-20

Background Cerium oxide (CeO₂) nanoparticles used as a diesel fuel additive can be emitted into the ambient air leading to human inhalation. Although biological studies have shown CeO₂ nanoparticles can cause adverse health effects, the extent of the biodistribution of CeO₂ nanoparticles through inhalation has not been well characterized. Furthermore, freshly emitted CeO₂ nanoparticles can undergo...

article

Exposure to concentrated ambient particulate matter induces reversible increase of heart weight in spontaneously hypertensive rats

Zhekang Ying, Xiaoyun Xie, Yuntao Bai, Minjie Chen, more

Particle and Fibre Toxicology > 2015 > 12 > 1 > 1-10

Background Exposure to ambient PM_2.5 increases cardiovascular mortality and morbidity. To delineate the underlying biological mechanism, we investigated the time dependence of cardiovascular response to chronic exposure to concentrated ambient PM_2.5 (CAP). Methods Spontaneously hypertensive rats (SHR) were exposed to CAP for 15 weeks, and blood pressure (BP), cardiac function and structure, and...

article

Spatial patterns in wet and dry deposition of atmospheric mercury and trace elements in central Illinois, USA

Mary M. Lynam, J. Timothy Dvonch, Naima L. Hall, Masako Morishita, more

Environmental Science and Pollution Research > 2014 > 21 > 6 > 4032-4043

An intensive 1-month atmospheric sampling campaign was conducted concurrently at eight monitoring sites in central Illinois, USA, from June 9 to July 3, 2011 to assess spatial patterns in wet and dry deposition of mercury and other trace elements. Summed wet deposition of mercury ranged from 3.1 to 5.4 μg/m² across sites for the total study period, while summed dry deposition of reactive mercury (gaseous...

article

Differential effects of inhalation exposure to PM2.5 on hypothalamic monoamines and corticotrophin releasing hormone in lean and obese rats

Priya Balasubramanian, Madhu P. Sirivelu, Kathryn A. Weiss, James G. Wagner, more

Neurotoxicology > 2013 > 36 > Complete > 106-111

Acute exposure to airborne pollutants, especially particulate matter (PM _2.5 ) is known to increase hospital admissions for cardiovascular conditions, increase cardiovascular related mortality and predispose the elderly and obese individuals to cardiovascular conditions. The mechanisms by which PM _2.5 exposure affects the cardiovascular system is not clear. Since the autonomic system...

article

Assessing the emission sources of atmospheric mercury in wet deposition across Illinois

Lynne E. Gratz, Gerald J. Keeler, Masako Morishita, James A. Barres, more

Science of the Total Environment > 2013 > 448 > Complete > 120-131

From August 4, 2007 to August 31, 2009, we collected event-based precipitation samples for mercury (Hg) and trace element analyses at four sites in Illinois (IL), USA. The objectives of these measurements were to quantify Hg wet deposition across the state, and to assess the contributions to Hg in precipitation from major local and regional emission sources. Monitoring sites were located, from north...

article

Reduced metabolic insulin sensitivity following sub-acute exposures to low levels of ambient fine particulate matter air pollution

Robert D. Brook, Xiaohua Xu, Robert L. Bard, J. Timothy Dvonch, more

Science of the Total Environment > 2013 > 448 > Complete > 66-71

Epidemiological studies suggest that fine particulate matter (PM _2.5 ) may increase the risk for developing diabetes mellitus (DM). To evaluate possible mechanisms explaining these associations, we investigated if sub-acute ambient-level exposures can impair insulin sensitivity. Twenty-five healthy adults living in rural Michigan were transported to an urban location for 5 consecutive days...

article

Source identification of ambient PM2.5 for inhalation exposure studies in Steubenville, Ohio using highly time-resolved measurements

Masako Morishita, Gerald J. Keeler, Ali S. Kamal, James G. Wagner, more

Atmospheric Environment > 2011 > 45 > 40 > 7688-7697

Recent epidemiological and toxicological studies have suggested that short-term elevations of ambient fine particle mass concentrations (aerodynamic diameter <2.5μm, PM _2.5 ) can increase cardiac and pulmonary health risks. Thus, examining temporal variations of chemical changes in ambient PM _2.5 that could pose the greatest health risks and identifying its sources is critical so...

article

Identification of ambient PM2.5 sources and analysis of pollution episodes in Detroit, Michigan using highly time-resolved measurements

Masako Morishita, Gerald J. Keeler, Ali S. Kamal, James G. Wagner, more

Atmospheric Environment > 2011 > 45 > 8 > 1627-1637

Recent studies have indicated that the chemical composition of ambient PM _2.5, or fine particulate matter (aerodynamic diameter <2.5μm), may be closely associated with the health effects induced by PM. Thus, identification of the sources of these components of PM _2.5 is critical to understanding source-specific health risks posed by PM _2.5 . However, ambient PM measurements...

article

Source-to-receptor pathways of anthropogenic PM2.5 in Detroit, Michigan: Comparison of two inhalation exposure studies

Masako Morishita, Gerald J. Keeler, Jacob D. McDonald, James G. Wagner, more

Atmospheric Environment > 2009 > 43 > 10 > 1805-1813

Recent studies have attributed toxic effects of ambient fine particulate matter (aerodynamic diameter≤2.5μm; PM _2.5 ) to physical and/or chemical properties rather than total mass. However, identifying specific components or sources of a complex mixture of ambient PM _2.5 that are responsible for adverse health effects is still challenging. In order to improve our understanding of source-to-receptor...

article

Source identification of ambient PM2.5 during summer inhalation exposure studies in Detroit, MI

Masako Morishita, Gerald J. Keeler, James G. Wagner, Jack R. Harkema

Atmospheric Environment > 2006 > 40 > 21 > 3823-3834

Particulate air pollution is associated with cardiopulmonary morbidity and mortality in heavily populated urban centers of the United States. Because ambient fine particulate matter (aerodynamic diameter ⩽2.5μm; PM _2.5 ) is a complex mixture resulting from multiple sources and variable atmospheric conditions, it is difficult to identify specific components of PM _2.5 that are responsible...

article

Characterization of complex mixtures in urban atmospheres for inhalation exposure studies

Gerald J. Keeler, Masako Morishita, Li-Hao Young

Experimental and Toxicologic Pathology > 2005 > 57 > Supplement 1 > 19-29

A real-world assessment of the source-to-receptor pathways for ambient particulate matter (PM), as opposed to in a laboratory environment, was crucial for gaining a better understanding of the types of particles to which people are actually exposed in their daily lives, and of the human-health risks for source-specific PM. However, obtaining scientific evidence linking specific source emissions to...

article

Evaluating porous-layer open-tubular capillaries as vapor preconcentrators in a microanalytical system

Edward T. Zellers, Masako Morishita, Qing-Yun Cai

Sensors & Actuators: B. Chemical > 2000 > 67 > 3 > 244-253

Measuring environmental concentrations of organic vapors with microfabricated chemical sensors or sensor arrays often requires a means to enrich collected samples prior to detection. With such an application in mind, a preliminary evaluation is described of two porous-layer open tubular (PLOT) capillary traps as vapor preconcentrators for a series of vapors. Short (1-cm) sections of commercial PLOT-Q...

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