Taking Soil Samples (IMAGE) Northern Illinois University Caption Recent Northern Illinois University graduate Karley Chantos-Davidson (left) and biology professors Nick Barber (center) and Wes Swingley (right) take soil samples at the Nachusa Grasslands preserve. Credit Northern Illinois University Usage Restrictions Please credit: Northern Illinois University License Licensed 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.