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.
Mean colony forming units for cefR E. coli after incubation at 23°C in a sandy soil and urine matrix (open circles, 0 ppm CFM; closed circles 50 ppm CFM). Regression lines between days 5 and 100 were significantly different (P<0.008). Bars = s.e.m.
