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.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Images performed at optical microscope (10× objective) of transversal layers of 5 μm, cut from UN, EM, and UCM durum wheat grains (up) and corn grains (down), first immersed in water for 17 h and then frozen at −20 °C.