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 261 - 270 of 293. Show 10 | 25 | 50 | 100 results per page.

DNA Binding by 1-Nitropyrene and Dinitropyrenes in Vitro and in Vivo: Effects of Nitroreductase Induction

Frederick A Beland
November 1989
Research Report 31

This report describes a study by Dr. Beland to investigate the extents to which 1-nitropyrene and 1,6-dinitropyrene, two PAHs found in diesel exhaust, bind DNA in order to better understand the higher relative mutagenicity of 1,6-Dinitropyrene. DNA binding was determined in rats by assay of tissue isolated from a variety of organs. A subset of rats was pretreated with 1-nitropyrene to determine any effect on induction of nitroreductases and subsequent DNA binding by both nitropyrenes.

Influence of Experimental Pulmonary Emphysema on Toxicological Effects from Inhaled Nitrogen Dioxide and Diesel Exhaust

Joe L Mauderly
David E Bice
Yung S Cheng
Nancy A Gillett
Rogene F Henderson
John A Pickrell
Ronald K Wolff
October 1989
Research Report 30

This report describes a study by Dr. Mauderly and colleagues to examine the influence of preexisting pulmonary emphysema on adverse health effects induced by chronic exposure of rats to diesel engine exhaust (DEE) or NO2. Rats were exposed 7 hours/day, 5 days/week for 24 months to 9.5 ppm NO2 or 3.5 mg soot/m3 DEE. Prior to exposure, a subset of rats was instilled with the proteolytic enzyme elastase to induce pulmonary emphysema.

Early Markers of Lung Injury

John N Evans
David R Hemenway
Jason Kelley
September 1989
Research Report 29

This report describes a study by Dr. Evans and colleagues to develop an early marker of lung injury that changes in response to exposure to NO2, which is an important component of mobile source emissions. Rats were exposed to NO2 in concentrations ranging from 0.5 to 30 ppm for 6 hours per day for periods ranging from 2 days to 4 weeks. Urine and bronchoalveloar lavage samples were collected and analyzed for the presence of the lung injury markers hydroxylysin, angiotensin-converting enzyme, and desmosine.

Nitrogen Dioxide and Respiratory Infection: Pilot Investigations

Jonathan M Samet
John Spengler
September 1989
Research Report 28

This report describes two pilot investigations for a longitudinal study of infants designed to determine if NO2 exposure from cooking stoves increases the incidence or severity of respiratory infections during the first 18 months of life. In the first study, Drs. Samet and Spengler selected 147 households with electric or gas stoves and infants for home indoor monitoring of NO2 concentrations; the infants\' mothers completed a daily calendar-diary on respiratory symptoms and provided illness information every 2 weeks.

Cardiovascular Effects of Chronic Carbon Monoxide and High-Altitude Exposure

James J McGrath
July 1989
Research Report 27

This report describes a study by Dr. McGrath to investigate the effect of chronic exposure of rats to CO at high altitude. Male rats were exposed for 6 weeks to CO ranging from 0 to 500 ppm at simulated altitudes ranging from 3,300 to 18,000 feet. The following weekly measurements were taken throughout the exposure period: weight, hematocrit, hemoglobin, and carboxyhemoglobin concentrations. Arterial pH, partial pressure of CO in the blood (PCO2) and PO2 were measured, as were blood pressure and ECG.

Investigation of a Potential Cotumorigenic Effect of the Dioxides of Nitrogen and Sulfur, and of Diesel-Engine Exhaust, on the Respiratory Tract of Syrian Golden Hamsters

Uwe Heinrich
Ulrich Mohr
Rainer Fuhst
Carsten Brockmeyer
May 1989
Research Report 26

This report describes a study by Dr. Heinrich and colleagues to investigate the effects of exposure to NO2 and SO2 or diesel engine exhaust on tumor formation in hamsters. Hamsters were exposed for 6, 10.5, 15, or 18 months to whole diesel exhaust, diesel exhaust without particles, or a mixture of NO2 and SO2. Additional groups of animals exposed to each test atmosphere were also injected with 3 or 6 mg of diethylnitrosamine/kg body weight to evaluate any enhancing effect of diethylnitrosamine on exposure-related changes.

Altered Susceptibility to Viral Respiratory Infection During Short-Term Exposure to Nitrogen Dioxide

Richard M Rose
Paula Pinkston
William A Skornik
March 1989
Research Report 24

This report examined the effect of nitrogen dioxide exposure on the sensitivity of the lower respiratory tract to viral infection and reinfection. Dr. Rose and colleagues exposed mice to concentrations of nitrogen dioxide ranging from 1-10 ppm or to air prior to and after inoculation with varying doses of murine cytomegalovirus. A subset of mice was reinfected 30 days later. Infection status, macrophage phagocytic uptake, lymphocyte function, and virus-specific antibody levels were measured, and the results were compared by exposure condition.

Detection of Paracrine Factors in Oxidant Lung Injury

Keith A Tanswell
February 1989
Research Report 22

This report addressed the hypothesis that hypertrophy of the lung after oxidant injury with ozone or oxygen is due to local generation of lung-specific growth factors. Dr. Tanswell exposed rats to either 85% oxygen, 1 ppm ozone, or air for up to two weeks while samples of plasma, lung washings, and lung tissue were periodically collected. These samples were tested for their effect on the DNA synthesis of purified populations of three major lung cell types (pneumocyte, fibroblast, and endothelial cell) in culture.

Responses of Susceptible Subpopulations to Nitrogen Dioxide

Paul E Morrow
Mark J Utell
February 1989
Research Report 23

This report investigated changes in pulmonary function, as well as the occurrence of symptoms, in potentially susceptible human subpopulations exposed to nitrogen dioxide. Drs. Morrow and Utell exposed healthy individuals and individuals with asthma, chronic obstructive pulmonary disease, and acute respiratory infection to air or 0.3 ppm nitrogen dioxide. The exposure period (four hours per day for five consecutive days) included defined periods of moderate exercise and pulmonary function measurements including spirometry, airway conductance, airway reactivity, and symptoms.

Maximal Aerobic Capacity at Several Ambient Concentrations of Carbon Monoxide at Several Altitudes

Steven M Horvath
James W Agnew
Jeames A Wagner
John F Bedi
December 1988
Research Report 21

This report examined the interactive effects induced by exposure to altitude and carbon monoxide. Dr. Horvath and colleagues exposed 23 healthy young human volunteers living at sea level to concentrations of 0, 50, 100, or 150 ppm carbon monoxide in a hyperbaric chamber simulating altitudes of 55, 1,524, 2,134, or 3, 048 meters above sea level. Maximal aerobic capacity tests were performed under each exposure condition while respiratory and cardiac variables and blood levels of carboxyhemoglobin, hemoglobin, and lactate were monitored.