An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
S M Hassan S, E Amr AE, Abd El-Naby H, A Al-Omar M, H Kamel A, Khalifa NM.S M Hassan S, et al. Among authors: khalifa nm.Polymers (Basel). 2019 Oct 16;11(10):1695. doi: 10.3390/polym11101695.Polymers (Basel). 2019.PMID: 31623171Free PMC article.
Abdalla NS, E Amr AE, S M El-Tantawy A, A Al-Omar M, H Kamel A, Khalifa NM.Abdalla NS, et al. Among authors: khalifa nm.Polymers (Basel). 2019 Sep 19;11(9):1526. doi: 10.3390/polym11091526.Polymers (Basel). 2019.PMID: 31546880Free PMC article.
Ezzat S, A Ahmed M, E Amr AE, A Al-Omar M, H Kamel A, Khalifa NM.Ezzat S, et al. Among authors: khalifa nm.Materials (Basel). 2019 Sep 10;12(18):2924. doi: 10.3390/ma12182924.Materials (Basel). 2019.PMID: 31510026Free PMC article.