Faculty Research

Professor Mike Leonardo (biology) - Dr. Leonardo is a microbial physiologist and ecologist who is interested in anaerobic microorganisms and their metabolism. Some of the studies in Dr. Leonardo's lab focus on microorganisms in the genus Shewanella, which are found in most aquatic environments on the planet. One of the interesting aspects of Shewanella species is their ability to use ferric iron and sulfur compounds as electron acceptors for growth in the absence of oxygen. Growth under these conditions has been shown to induce corrosion of metals and concrete in which Shewanella has attached. Extracellular polymeric substances (EPS), a major component in the development of biofilms on inert surfaces, are produced by Shewanella species, which appears to enhance the rate of iron and sulfur reduction. Shewanella mutants, defective in EPS synthesis, have been generated in the lab and they are currently being studied for their ability to induce corrosion. A second project, in collaboration with Michelle Scherer at the University of Iowa, looks at the bioavailability of nanoscale ferric iron oxides in the environment. Other studies in Dr. Leonardo's lab use molecular techniques to study the microbial biodiversity in local ponds, streams and lakes.

Mike Leonardo

Professor Paula Sanchini (biology) - Dr. Sanchini is a community ecologist interested in landscape patterns and biodiversity. The Faulke's Heritage Woods is the largest tract of undisturbed forest in Linn County, Iowa. In 1987, an analysis was completed of vegetation designed to give a snapshot of the condition of the forest against which future changes could be measured. This study nowoffers students arich GIS database through which they can investigate oak decline and urban deer impacts. Dr. Sanchini's students are assisting the City of Cedar Rapidsstudythe conditionof the urban forest through a US Forest Service program called iTREE. Last summer, Dr Sanchini and three Coe students started an environmental project in Swaziland, a country in southern Africa that has been hard hit by HIV/AIDS. This program will offer student the opportunity to study and do field research onwaterquality andecotourism in southern Africa. Find out more from this recent Coe Courier article.

Paula Sanchini

Professor Marty St. Clair (chemistry) - Research opportunities with Dr. St. Clair are in the general area of environmental chemistry. An ongoing study investigates the nitrogen budget for the Cedar River between Cedar Rapids and Waterloo. Samples are analyzed for a variety of nitrogen and phosphorus containing species using both chromatographic and spectroscopic methods. Results are then correlated with watershed characteristics such as land use, soil type, and precipitation. Questions to be addressed in this project include the dynamics of nutrient interconversion, the significance of groundwater recharge versus surface flow, and the importance of non-nutrient species as biological limiting factors. A second project, in collaboration with Professor Michelle Scherer at the University of Iowa, investigates the fundamental mechanism of the reactions of reduced iron species in the environment. A wide variety of techniques - including voltammetry at a rotating disc electrode, Mössbauer spectroscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy - are used to probe these reactions.

Marty St. Clair