Publications

This page is a list of publications in reverse chronological order. Please use search or the filters to browse by research areas, publication types, and content types.

Displaying 251 - 275 of 317. Show 10 | 25 | 50 | 100 results per page.


Failure of Ozone and Nitrogen Dioxide to Enhance Lung Tumor Development in Hamsters

Hanspeter Witschi
Michael A Breider
Hildegard M Schuller
September 1993
Research Report 60

Ozone and nitrogen dioxide are highly reactive oxidant gases that are derived from the combustion of fossil fuels and the atmospheric transformation of these combustion products. A major unanswered question is whether or not exposure to oxidant air pollutants contributes to lung cancer. Dr. Witschi and colleagues at the University of California at Davis examined whether exposure to ozone or nitrogen dioxide enhances the development of tumors induced by the chemical carcinogen diethylnitrosamine (DEN), particularly neuroendocrine tumors, in the respiratory tract of hamsters.

Characterization of Particle- and Vapor-Phase Organic Fraction Emissions of a Heavy-Duty Diesel Engine Equipped with a Particle Trap and Regeneration Controls

Susan T Bagley
Linda D Gratz
David G Leddy
John H Johnson
July 1993
Research Report 56

Devices have been developed to reduce particle emissions from vehicles with diesel engines, such as a trap that filters the particles from the exhaust. Periodically, the trap is cleaned (regenerated) by electric heating, thereby burning the particles before they can clog the trap. There is concern that potentially harmful chemicals associated with the particles may be emitted from the trap during normal use and regeneration. Dr.

Nitrogen Dioxide and Respiratory Illness in Children, Part I: Health Outcomes, and Part II: Assessment of Exposure to Nitrogen Dioxide

Jonathan M Samet
William E Lambert
June 1993
Research Report 58-I & II

This publications contains two reports by Drs. Jonathan M. Samet, John D. Spengler, and colleagues, who conducted a prospective investigation of 1,205 healthy infants living in homes with gas or electric stoves in Albuquerque, NM. Nitrogen dioxide exposures were carefully estimated from repeated measurements in multiple locations in the subjects' homes throughout the entire 18-month observation period. Respiratory illnesses were monitored prospectively using a surveillance system based on daily parental diaries of respiratory signs and symptoms. Parental reports of illness episodes were validated in a subset of the population by comparison with clinical diagnoses and microbiological testing. Potential confounding factors that influence respiratory infections were reduced by selecting subjects whose parents did not smoke or intend to use day-care services outside the home.

Research Priorities for Mobile Air Toxics

Health Effects Institute
June 1993
Communication 2

Communication 2 provides information to decision makers on research that is potentially capable of narrowing uncertainties related to the health effects of specific air toxics. This report is based on the Mobile Air Toxics Workshop held in Monterey, CA, December 4–6 1992.

Do Electric or Magnetic Fields Cause Adverse Health Effects?

Health Effects Institute
June 1993
Special Report

HEI's Research Plan to Narrow the Uncertainties. This report of the HEI Electric and Magnetic Fields (EMF) Research Planning Committee presents a 5-7 year research program intended to clarify whether or not there are adverse health effects from exposure of the public to EMF from electric power transmission, machinery, or household appliances.

Determination of the Atherogenic Potential of Inhaled Carbon Monoxide

Arthur Penn
May 1993
Research Report 57

Carbon monoxide is a ubiquitous air pollutant. It is found in cigarette smoke and emissions from motor vehicles, industrial processes, and poorly ventilated combustion sources. Dr. Penn and his colleagues at New York University Medical Center sought to determine whether chronic exposure to ambient levels of carbon monoxide is also a risk factor for developing atherosclerosis because this disease is the leading contributor to deaths by heart attack and stroke in the United States.

Noninvasive Methods for Measuring Ventilation in Mobile Subjects

J Dennis McCool
Jonathan M Samet
May 1993
Research Report 59

This document contains two reports by Drs. McCool and Samet and their colleagues who were funded to develop and test methods for measuring ventilation in freely mobile subjects at home or at work. Drs. Dennis McCool and Domyung Paek at the Memorial Hospital in Rhode Island measured ventilation with a body surface displacement (BSD) model. Each subject wore wide elastic bands containing coated wire coils around the chest and abdomen and had special magnets affixed to the breastbone and navel, which yielded data about their breathing patterns, breath frequency, and ventilation. In the second study, Dr. Jonathan Samet and colleagues at Johns Hopkins University wanted to develop methods for estimating ventilation from heart rate for future epidemiologic studies. They used the Heartwatch, a portable, commercial device combining a small transmitter worn on the subject's chest with a wristwatch-style receiver that records heart rate.

Mutations Induced by 1-Nitrosopyrene and Related Compounds During DNA Recombination by These Compounds

Veronica M Maher
Nitai P Bhattacharyya
M Chia-Miao Mah
Janet Boldt
Jia-Ling Yang
J Justin McCormick
March 1993
Research Report 55

Nitropyrenes, which form during diesel fuel combustion, cause mutations and are carcinogenic in some animals. Dr. Veronica Maher and colleagues at Michigan State University studied the effect of nitropyrene-DNA adducts on gene mutation. The investigators exposed a specific gene, in culture, to each of two nitropyrene derivatives. They then (1) compared the number of adducts formed by each derivative, (2) analyzed the chemical structure of the adducts, and (3) determined in which region of the DNA the adducts formed.

Oxidant Injury to the Alveolar Epithelium: Biochemical and Pharmacologic Studies

Bruce A Freeman
Peter C Panus
Sadis Matalon
Barbara J. Buckley
R Randall Baker
January 1992
Research Report 54

Ozone and nitrogen dioxide are significant outdoor and indoor air pollutants that can cause lung damage. Both are termed oxidant gases because the oxygen atoms they contain react with a variety of lung components and produce injury. Dr. Bruce Freeman and colleagues at the University of Alabama, Birmingham examined oxidant injury to alveolar epithelial cells and tested whether supplementing the levels of antioxidants would modify the cells' resistance to damage.

Use of Physical Chemistry and in Vivo Exposure to Investigate the Toxicity of Formaldehyde Bound to Carbonaceous Particles in the Murine Lung

George J Jakab
Terence H Risby
David R Hemenway
October 1992
Research Report 53

Dr. George Jakab and associates the Johns Hopkins University School of Public Health examined the effects of inhaled formaldehyde, an airway irritant that is part of motor vehicle emissions, on alveolar macrophages. The investigators exposed mice to varying levels of formaldehyde alone or to formaldehyde mixed with carbon black particles. Carbon black particles were chosen because of their similarity to combustion derived particles. Different alveolar macrophage functions were evaluated using two assays.

Carbon Monoxide Exposure of Subjects with Documented Cardiac Arrhythmias

Bernard R Chaitman
Thomas E Dahms
Sheila Byers
Lisa W Carroll
Liwa T Younis
Robert D Wiens
September 1992
Research Report 52

Drs. Chaitman and coworkers at the St. Louis University School of Medicine examined whether there is a link between carbon monoxide exposure and arrhythmias in subjects with coronary artery disease. Carbon monoxide is a ubiquitous air pollutant. It is found in cigarette smoke and emissions from motor vehicles, industrial processes, and poorly ventilated combustion sources. The investigators studied 25 men and 5 women, aged 45 to 77 years, all of whom were nonsmokers with stable coronary artery disease and who had moderate levels of ventricular arrhythmias.

Effects of Formaldehyde on Xenotransplanted Human Respiratory Epithelium

Andres JP Klein-Szanto
Hitoshi Ura
Shigeru Momiki
Daniel Bonfil
Samuel Litwin
July 1992
Research Report 51

Dr. Klein-Szanto and colleagues at the Fox Chase Cancer Center employed a novel exposure system to explore the capacity of formaldehyde to cause cancerous changes in human epithelial cells. Formaldehyde is classified as a toxic air pollutant and is emitted in exhaust of motor vehicles, but whether or not formaldehyde is injurious to human health is controversial. The investigators obtained autopsy samples from human infant airways and from adult nasal tissue.

The Role of Ozone in Tracheal Cell Transformation

David G Thomassen
Jack R Harkema
James D Sun
Nicole D Stephens
William C Griffith
April 1992
Research Report 50

Ozone is a highly reactive gas that is a pervasive air pollutant at ground level. It is a major component of urban smog, forming when emissions from mobile and industrial sources interact with sunlight. When inhaled, ozone can cause cough, shortness of breath, and transient changes in breathing patterns; however the health significance of these effects is unknown. Dr. David Thomassen and coworkers examined the ability of ozone to alter the structure and growth characteristics of epithelial cells from rat tracheas in ways consistent with precancerous changes.

New Methods in Ozone Toxicology: Abstracts of Six Pilot Studies

Health Effects Institute
April 1992
Communication 1

HEI Communications 1 contains abstracts for six feasibility studies that were funded under RFA 89-2: Health Effects of Chronic Ozone Inhalation: Collaborative National Toxicology Program–Health Effects Institute Studies: Pilot Studies.

Mechanisms of Aldehyde-Induced Bronchial Reactivity: Role of Airway Epithelium

George D Leikauf
February 1992
Research Report 49

Dr. George Leikauf and coworkers at the University of Cincinnati Medical Center examined the mechanism by which aldehyde inhalation can alter breathing patterns and damage cells lining the airways. Emissions from motor vehicles using gasoline and diesel fuels add to the outdoor levels of aldehydes, including formaldehyde and acrolein, which are known irritants of the respiratory tract. The investigators prposed to examine whether airway constriction due to exposure to aldehydes is caused by damage to airway cells, by the entry of white blood cells into the lungs, or both.

Murine Respiratory Mycoplasmosis: A Model to Study Effects of Oxidants

Jerry K Davis
Maureen Davidson
Trenton R Schoeb
December 1991
Research Report 47

Nitrogen dioxide is an ubiquitous air pollutant resulting from the combustion of fossil fuels. When inhaled at high levels, it reacts with and damages lung cells, including those cells that fight infection. This damage can affect breathing and may increase the risk of respiratory infections. Dr. J.K. Davis and his colleagues at the University of Alabama, Birmingham examined whether exposure to lower levels of nitrogen dioxide (less than 5 ppm) compromises mouse lung defense.

Role of Ring Oxidation in the Metabolic Activation of 1-Nitropyrene

Frederick A Beland
December 1991
Research Report 46

Nitropyrenes are a class of chemicals found in diesel engine exhaust that can form DNA adducts and are suspected animal carcinogens. Dr. Beland at the University of Arkansas for Medical Sciences examined the relationship between DNA adducts and cancer in laboratory animals treated with 1-nitropyrene, the major nitropyrene present in diesel engine exhaust. The investigator used state-of-the-art techniques to study DNA adducts formed from 1-nitropyrene under different conditions of exposure, with an emphasis on identifying unique adducts that had not been recognized before.

Effects of Ozone Exposure on Airway Epithelial Permeability and Ion Transport

Philip A Bromberg
Venkatachalam Ranga
M Jackson Stutts
December 1991
Research Report 48

Ozone is a highly reactive gas that is a pervasive air pollutant at ground level. It is a major component of urban smog, forming when emissions from mobile and industrial sources interact with sunlight. When inhaled, ozone can cause cough, shortness of breath, and transient changes in breathing patterns; however the health significance of these effects is unknown. Dr. Philip Bromberg and coworkers at the University of North Carolina, Chapel Hill examined whether exposure to ozone alters properties of the airway epithelium.

The Effects of Exercise on Dose and Dose Distribution of Inhaled Automotive Pollutants

Michael T Kleinman
William J Mautz
October 1991
Research Report 45

The human health effects that result from breathing air pollutants depend on the amount of pollutant inhaled from the air (exposure dose) and the amount of inhaled material that stays in the respiratory tract (retained dose). Because the retained dose of a pollutant may damage the respiratory tract and cause disease, it is a key factor for determining appropriate government regulations for air pollutants. Drs.

Leukocyte-Mediated Epithelial Injury in Ozone-Exposed Rat Lung

Kenneth Donaldson
Geraldine M Brown
David M Brown
Joan Slight
William M Maclaren
John MG Davis
October 1991
Research Report 44

Ozone is a highly reactive gas that is a pervasive air pollutant at ground level. It is a major component of urban smog, forming when emissions from mobile and industrial sources interact with sunlight. When inhaled, ozone can cause cough, shortness of breath, and transient changes in breathing patterns; however the health significance of these effects is unknown. Drs. Kenneth Donaldson and coworkers at the Institute of Occupational Medicine examined whether exposure to ozone activates white blood cells to release substances that can damage lung tissue.

Effects of Methanol Vapor on Human Neurobehavioral Measures

Mary R Cook
Fred J Bergman
Harvey D Cohen
Mary M Gerkovich
Charles Graham
Roger K Harris
Linda G Siemann
August 1991
Research Report 42

In this pilot study, Dr. Mary Cook and colleagues at the Midwest Research Institute explored how exposure to methanol vapor might affect the human nervous system. Methanol could be used as an alternative fuel, but it may lead to increased levels of methanol and formaldehyde in the atmosphere. The investigators exposed 12 young male volunteers to either filtered air or methanol vapor and assessed their response using 20 commonly used tests of sensory, behavioral, and reasoning performance before, during, and after each exposure.

Mechanisms of Nitrogen Dioxide Toxicity in Humans

Mark J Utell
Mark W Frampton
Norbert J Roberts Jr
Jacob N Finkelstein
Christopher Cox
Paul E Morrow
August 1991
Research Report 43

Nitrogen dioxide is an ubiquitous air pollutant that can react with and damages lung cells when inhaled at high levels. Although outdoor and indoor levels of nitrogen dioxide are usually below the annual standard of 0.053 ppm, peaks can occur that reach up to 10 times this standard. Dr. Mark Utell and coworkers at the University of Rochester examined the human health impacts of higher (peak) levels of nitrogen dioxide that exceed the annual standard. The investigators exposed healthy, nonasthmatic, human volunteers to either nitrogen dioxide or filtered air for three hours.

Effects of 4 Percent and 6 Percent Carboxyhemoglobin on Arrhythmia Production in Patients with Coronary Artery Disease

David S Sheps
Margaret C Herbst
Alan L Hinderliter
Kirkwood F Adams
Lars G Ekelund
John J O'Neil
George M Goldstein
Philip A Bromberg
Martha Ballanger
Sonia M Davis
Gary Koch
May 1991
Research Report 41

Dr. Sheps and colleagues assessed the effect of exposure to carbon monoxide (CO) on ventricular arrhythmias in 41 nonsmoking human volunteers with coronary artery disease. On 3 consecutive days, volunteers were exposed in random order to air, 100 ppm CO (target 4% carboxyhemoglobin), and 200 ppm CO (target 6% carboxyhemoglobin), followed by a bicycle exercise test. Radionuclide cardiac ventriculography and ambulatory electrocardiogram were performed at rest and during exercise.

Retention Modeling of Diesel Exhaust Particles in Rats and Humans

CP Yu
KJ Yoon
May 1991
Research Report 40

This report describes a study by Drs. Yu and Yoon to mathematically predict the lung burden in rats and humans of diesel exhaust particles (DEP) from automobile emissions. Building on a previously constructed model describing DEP deposition, the present work focused on clearance and retention of DEPs deposited in the lung. The transport rates of each component of DEPs were derived using experimental data and mathematical approximations. The complete model was first developed for rats and then extrapolated to humans of different age groups.

Noninvasive Determination of Respiratory Ozone Absorption: Development of a Fast-Responding Ozone Analyzer

James S Ultman
Abdellaziz Ben-Jebria
March 1991
Research Report 39

This report describes a study by Drs. Ultman and Ben-Jebria to develop a chemiluminescent ozone analyzer and constructed an ozone bolus generator with the goal of using bolus concentration-response methods to noninvasively measure the longitudinal distribution of ozone absorption in human lungs. The analyzer was based on the chemiluminescent reaction between 2-methyl-2-butene and ozone. Validation of the system was performed in excised pig and sheep tracheas, and the resulting absorption coefficient was computed.