00735nam a2200193 a 4500008004100000100001800041245013500059260006900194300004300263500004100306500002900347650001600376650002200392650002800414700007200442003000100514005001700515040000900532                                        1 aBasopo, Norah10aEffects of pesticides on esterase activity of two species of freshwater snails helisoma duryi and lymnaea natalensis /cN. Basopo.  aBulawayo :bNatioanl University of Science and Technology,c2007  axx, 197 p.:bill. (some col.);c28 cm.  aIncludes bibliographical references.  aThesis(PhD)---NUST,2007.  aPesticides.  aFreshwater snails 1aWater. Aquatic biology.  aNUST.bDepartment of Applied Biology and BiochemistrytThesis (PhD)20230120153123.0  cNUST