The Office of the Vice President for Research is pleased to host the next Water@Wayne Seminar on Thursday, January 10, 2013 at 2:30 p.m. at the Welcome Center Auditorium, 42 W. Warren, Detroit. Professer Yu-Ping Chin from Ohio State University will discuss: "Transformation of Growth Promoters Used in Concentrated Animal Feed Operations by Plants and Soils".
In agricultural systems, crop plants and soils may transform chemicals used to promote the rate of growth in animals. We examined the transformation of two natural steroid estrogens (17β‐estradiol [17β‐E2] and estrone [E1]) and two synthetic estrogen mimics (zeranol [α‐ZAL] and zearalanone [ZAN]) by maize seedlings. Further the transformation of tylosin, an antibiotic used as a growth promoter and to prevent diseases in swine, was examined in soils. In hydroponic solutions exposed to whole maize seedlings, both oxidation (i.e., 17β‐E2 to E1 and α‐ZAL to ZAN) and reduction (i.e., E1 to 17β‐E2 and ZAN to α‐ZAL) transformations were observed. Although all four estrogens were measured, both as parents and products, in exposed maize roots, only 17β‐E2 and α‐ZAL were detected in shoots regardless of whether they were the parent or the product. In estrogen solutions exposed to crude plant tissue enzyme extracts, the products of reductive transformations were readily detected but only trace levels of oxidation products were present. Tylosin transformation was observed in several Midwest soils and proceeded through abiotic pathways. We demonstrated that these degradation pathways were principally mediated by the presence of iron and manganese oxides. Experiments conducted with birnessite and goethite resulted in rapid tylosin transformation, but lead to different products. Both soil and plant based degradation pathways are expected to generally decrease the overall estrogenicity of runoff from manure‐fertilized fields.
A small reception will follow in the Welcome Center Lobby from 3:30 - 4:00 p.m.
Parking is available in Parking Structure #6 on Putnam (between Woodward and Cass). Please enter via the visitors gate, take a green receipt. Bring your receipt to the Water@Wayne registration table at the Welcome Center for validation.