Publications

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Displaying 261 - 270 of 347. Show 10 | 25 | 50 | 100 results per page.

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part XI: Integrative Summary

Paul J Catalano
Ling-Yi Chang
Jack R Harkema
Debra A Kaden
Jerold A Last
Paul W Mellick
William C Parks
Kent E Pinkerton
Bhandaru Radhakrishnamurthy
Louise M Ryan
John L Szarek
1995
Research Report 65-XI
Ozone & Oxidants

In 1987, the Health Effects Institute entered into a partnership with the National Toxicology Program (NTP) to evaluate the effects of prolonged ozone exposure on F344/N rats. The NTP studies focused on carcinogenicity. HEI funded eight independent research studies, including investigations of lung biochemical constituents, structural and cellular changes, lung function, and nasal structure and function.

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Parts VIII and IX

Ling-Yi Chang
Kent E Pinkerton
1995
Research Report 65-VIII & IX
Ozone & Oxidants

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. In this report, two of studies and in the NTP/HEI Collaborative Ozone Project, were conducted to determine whether prolonged inhalation of ozone produces lasting effects on lung structure, potentially contributing to or aggravating chronic lung disease. Drs. Chang and Pinkerton and their respective colleagues investigated the effects of this prolonged ozone exposure on respiratory tract structure in healthy male and female F344/N rats. 

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part X: Robust Composite Scores Based on Median Polish Analysis

Paul J Catalano
John Rogus
Louise M Ryan
1995
Research Report 65-X
Ozone & Oxidants

One major component of urban smog is ozone, a highly reactive gas that forms when emissions from mobile and industrial sources react chemically in the presence of sunlight.  One concern is that prolonged ozone exposure could cause noncancerous lung diseases such as fibrosis and emphysema. The NTP's bioassay project presented a unique opportunity for a collaboration between the HEI and the NTP.

Oxidant and Acid Aerosol Exposure in Healthy Subjects and Subjects with Asthma

Jane Koenig
Mark J Utell
1994
Research Report 70
Nitrogen Oxides
Ozone & Oxidants

In two separate studies, Drs. Koenig and Utell examined the effects of exposing healthy subjects and subjects with asthma to combined oxidant and acid pollutants. Each team of investigators conducted studies in which human volunteers received either combined or sequential exposures to oxidant gases and acid aerosols and standard pulmonary function tests were performed and symptoms were recorded. Dr. Koenig and colleagues exposed 28 adolescents with asthma to varying concentrations of ozone, nitrogen dioxide, and sulfuric acid. Dr. Utell and colleagues examined the effects of sequential exposures to sulfuric acid and ozone on pulmonary function in 30 subjects with asthma and 30 healthy subjects between the ages of 18 and 45. 

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part VII: Effects on the Nasal Mucociliary Apparatus

Jack R Harkema
Kevin T Morgan
Elizabeth A Gross
Paul J Catalano
William C Griffith
1994
Research Report 65-VII
Ozone & Oxidants

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. The nose is the first line of defense against inhaled pathogens, dusts, and irritant gases; thus, changes induced by ozone in the normal functions of the nose could result in an increased susceptibility to respiratory infections and other diseases. In one of eight studies in the NTP/HEI Collaborative Ozone Project, Drs.

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part V: Effects on Pulmonary Function

Jack R Harkema
Joe L Mauderly
1994
Research Report 65-V
Ozone & Oxidants

Ozone is the major pollutant in smog. It is formed by complex photochemical reactions between nitrogen oxides and volatile organic compounds in the presence of sunlight. Motor vehicle and industrial emissions are prominent sources of these compounds. Peak atmospheric ozone concentrations generally occur during the summer months because the photochemical reactions that produce ozone are enhanced by sunlight and high temperature.

Pulmonary Toxicity of Inhaled Diesel Exhaust and Carbon Black in Chronically Exposed Rats. Part I: Neoplastic and Nonneoplastic Lung Lesions

Joe L Mauderly
M Burton Snipes
Edward Barr
Steven A Belinsky
James A Bond
Antone L Brooks
I-Yiin Chang
Yung S Cheng
Nancy A Gillett
William C Griffith
Rogene F Henderson
Charles E Mitchell
Kristen J Nikula
1994
Research Report 68-I
Diesel Exhaust
Particulate Matter

Dr. Mauderly and coworkers exposed F344/N rats to clean air or to one of two levels (2.5 or 6.5 mg of particles/m3 of diesel exhaust or air) of either emissions from a light-duty diesel engine or carbon black particles. The exposures lasted for 16 hours/day, 5 days/week, for 24 months. The carbon black particles were similar to the soot particles in the diesel engine exhaust; however, they contained markedly lower amounts of adsorbed organic compounds.

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part IV: Effects on Expression of Extracellular Matrix Genes

William C Parks
Jill D Roby
1994
Research Report 65-IV
Ozone & Oxidants

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. Prolonged ozone exposure may injure respiratory tissue, leading to the development or exacerbation of chronic lung diseases such as fibrosis or emphysema. An excess of connective tissue can lead to fibrosis and changes in connective tissue are believed to be an underlying cause of emphysema. Dr.

Consequences of Prolonged Inhalation of Ozone on F344/N Rats: Collaborative Studies. Part III: Effects on Complex Carbohydrates of Lung Connective Tissue

Bhandaru Radhakrishnamurthy
1994
Research Report 65-XIII
Ozone & Oxidants

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. The study of the effects of long-term ozone exposure on lung complex carbohydrates, described in this report, was one of eight laboratory studies supported by the NTP/HEI collaborative agreement. In addition to studying lung and nasal structure and function, investigators studied other constituents of lung connective tissue. Dr.

Noninvasive Determination of Respiratory Ozone Absorption: The Bolus-Response Method

James S Ultman
Abdellaziz Ben-Jebria
Shu-Chieh Hu
1994
Research Report 69
Ozone & Oxidants
Biological Methods

Dr. James Ultman and colleagues at Pennsylvania State University used a fast-responding ozone measurement system, which they had developed with previous HEI support, to noninvasively measure the absorption of inhaled ozone in different regions of the respiratory tract of healthy adult men. While the subject was breathing through the measurement apparatus, a narrow 10-mL bolus of ozone was introduced into the inhaled air at a predetermined point.