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.
Stereomicroscopy images of bi-layered membranes (1 × , 2 × ) and SEM images of chitosan/PEO nanofiber coated porous layer surface (A,B,C) with 250 × , 1000 × and 2500 × magnifications; cross-sectional view of bi-layered structure (D,E,F) with 250 × , 500 × and 10,000 × magnifications. Adopted from reference 67 with permission.
