Hans Vogel, University of Calgary (IMAGE) University of Calgary Caption Hans Vogel of the University of Calgary is trying to better understand the blood clotting process. He is using nuclear magnetic resonance spectroscopy to determine the physical and chemical structure of the platelet protein in the sample he is holding. Credit Riley Brandt, University of Calgary Usage Restrictions Please use above credit. 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.