polypropylene microfibers (IMAGE) Oregon State University Caption Larval inland silversides with polypropylene microfibers in their digestive tracts. Photo: Oregon State University. Credit Oregon State University Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.