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.
Protein content of soil, without and with added minerals, and of the pure minerals (montmorillonite, kaolinite, and goethite) after addition of amylase (A) and cellulase (B). X-axis: pure soil, soil with varying amounts of added minerals (+1%, +5%, and +10%), and pure minerals. Bars marked with # were not significantly different from the control (pure soil). Error bars represent standard error of means (n = 4).
