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.
ISR generated by the three reference materials are represented, with the cell viability for each in the inset. (a) Glass beads, (b) NIST San Joaquin Valley soil (#2709), and (c) NIST Montana soil (#2710). For some data point, the error bars are hidden by the symbols.
