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.
Angled scanning electron micrographs (SEM) of microfabricated resonance shifting MRI agents in the form of (top to bottom): spaced double-disk pairs, hollow cylinders, and ellipsoidal shells. Scale bars (top to bottom): 10 μm, 2 μm, and 2 μm. Idealized shape schematics shown alongside.
