Donald Morris "Don" Crothers (January 28, 1937 – March 16, 2014) was an American academic and a longtime professor of chemistry at Yale University. He was best known for fundamental work on nucleic acid structure and function, applying quantitative physical chemistry to biological polymers. His research blended careful laboratory measurements with theoretical analysis to interpret how DNA and RNA molecules adopt specific structures, how they hybridize, and how sequence and environment determine stability.

Research focus and contributions

Crothers’s laboratory addressed core questions in the physical chemistry of nucleic acids. He studied base pairing and stacking interactions, thermodynamic parameters that govern helix stability, and the folding and hybridization behavior of oligonucleotides. His group combined experimental approaches such as optical spectroscopy and melting-curve analysis with statistical-mechanical models to extract thermodynamic and kinetic information. These studies clarified how simple chemical and electrostatic forces control large-scale properties of DNA and RNA and provided parameters and concepts widely used in molecular biology, biophysics and biotechnology.

Methods and topics associated with his work

  • Thermodynamics of helix formation and hybridization, including the effects of salt and sequence
  • Base stacking, base pairing, and their contribution to duplex stability
  • Folding and structure of short RNAs and DNAs and their relationship to function
  • Integration of precise experimental measurement with mathematical and physical models

Teaching, mentorship and career

At Yale, Crothers taught both undergraduate and graduate courses and supervised many doctoral students and postdoctoral researchers who went on to academic and industrial careers. He was noted for bridging experimental biochemistry and quantitative physical chemistry, and for training scientists to combine careful experimentation with rigorous data interpretation. His long association with a major research university helped disseminate his methods and ideas across fields.

Personal background, passing and legacy

Crothers was born in Fatehgarh, then part of British India, in what is today Fatehgarh in India. He spent most of his professional life in the United States and became widely respected for contributions that clarified how molecular structure gives rise to biological behavior. Crothers died of cancer on March 16, 2014 at the Smilow Cancer Hospital in New Haven, Connecticut. He was 77 and was survived by his wife and two daughters. His publications, the conceptual frameworks he helped establish, and the many scientists he trained constitute a lasting legacy in nucleic acid chemistry and molecular biophysics.