Because of the near-universal …nding that minorities fare poorly on standardized tests, the use of such tests for employment screening is thought to pose an equity-e¢ ciency trade-o¤: improved selection comes at a cost of screening out more minority applicants. This paper investigates the consequences of standardized testing for minority employment and productivity. We analyze the experience of...

We present an algorithm for determining whether a set of species, described by the characters they exhibit, has a perfect phylogeny, assuming the maximum number of characters is fixed. This algorithm is simpler and faster than the known algorithms when the number of characters is at least 4. Disciplines Theory and Algorithms This article is available at Iowa State University Digital Repository:...

As part of an NSF-funded initiative, biology students, primarily those in the early stages of their degree program, were recruited to participate in ongoing research alongside principle investigators. In this example, ten students were given five weeks of intensive training in molecular research methods, with the objective of cloning genes involved in core metabolic processes in the parasitic p...

Infection of crop species by parasitic plants is a major agricultural hindrance resulting in substantial crop losses worldwide. Parasitic plants establish vascular connections with the host plant via structures termed haustoria, which allow acquisition of water and nutrients, often to the detriment of the infected host. Despite the agricultural impact of parasitic plants, the molecular and deve...