Effects Of Gaseous Air Pollutants Research Articles

Effects of gaseous air pollutants on gastric secreto-motor activities in the rat.

A study was initiated to ascertain whether gaseous air pollutants can influence gastric secreto-motor activities. The investigation was conducted to determine the effect of various exposures to S02, N02, CO, and 03 on gastric motor activity of the conscious unrestrained rat by means of a chronic intragastric bajloon. Tfie effects produced upon gastric secretory volume and total titratable acid secretion produced by these gases were also studied in rats which were pylorus-ligated subsequent to exposure. Rats exposed to 1 ppm S02 for 5 days, 60 ppm CO for 2 hours, 0.5 ppm N02 for 2 hours, or 0.25 ppm 03 for 2 hours showed no change while there was gastric inhibition at 300 ppm S02 for 2 hours, 1400 ppm CO for 1 hour, 26 ppm N02 for 2 hours and 1.5 ppm 03 for 2 hours. In most instances following chamber flushing recovery was complete within minutes. To evaluate the site and nature of stimulation, rats were also exposed to oil of mustard, benzaldehyde, hydrogen peroxide, amyl acetate, and “Old Spice” after sh...

Identification of Particulate Air Pollutants and Contaminants by Scanning Electron Microscopy and X-ray Spectrometry

Although our knowledge of the effects of gaseous air pollutants on plants is expanding rapidly, little is known about the identification and effects of particulate air pollutants on plant surfaces. Accordingly, a two-phase study was undertaken: (a) to identify and characterize the various particulate pollutants and contaminants found on leaf surfaces; and (b) to determine their physical and chemical effects. This report describes the progress made in the first phase of this study.Using a Jeolco JSM-U3 scanning electron microscope with double dispersive X-ray spectrometers, observations were made on intact leaf surfaces (upper and lower) and on various particulate samples. Studies were made on various crop plants as well as on native chaparral and desert plants. Most of the samples were coated with approximately 50-100 Å of gold-palladium metal, since “charging” is a definite problem with particulate specimens.

Effects of gaseous air pollutants on the response of the Thomas sulfur dioxide Autometer

Effects of gaseous air pollutants on the response of the Thomas sulfur dioxide Autometer