An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Investigating the chemical nature of organic matter in a rice soil, chemist Klaus Schmidt-Rohr (front) and soil scientist Dan Olk (middle) examine a spectrum acquired through NMR spectroscopy. In the background, chemist Jingdong Mao loads a sample into the spectrometer.