An official website of the United States government
Here's how you know
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.
a) A flame-sealed 18 µL spherical NMR microsample bulb filled with doped water, a US one-cent coin (19.05 mm in diameter), and solenoidal wireless MR coil; b) the assembled wireless MR active marker.