Due to a lack of financial resources, we unfortunately have to suspend the import of any new radio frequency and mobile phone-related articles as of now (November 27, 2017). We apologize for this inconvenience and will keep you informed.


1. Cell biology. The cell membrane is the thin covering of a cell or cell part, consisting of two layers of phospholipids.
2. Medicine. A thin layer of tissue which covers a surface, lines a cavity or divides a space or organ.