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Zayed, E.M.E.,El-Moneam, M.A. 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1
The main objective of this paper is to study the boundedness character, the periodic character and the global stability of the positive solutions of the following difference equation $x_{n+1}=\frac{{\alpha}x_n+{\beta}x_{n-1}+{\gamma}x_{n-2}+{\delta}x_{n-3}}{Ax_n+Bx_{n-1}+Cx_{n-2}+Dx{n-3}}$, n=0, 1, 1, ... where the coefficients A, B, C, D, ${\alpha},\;{\beta},\;{\gamma},\;{\delta}$ and the initial conditions x-3, x-2, x-1, x0 are arbitrary positive real numbers.
On the rational recursive sequence
E. M. E. Zayed,M. A. EL-Moneam 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.22 No.1-2
The main objective of this paper is to study the boundedness character, the periodic character and the global stability of the positive solutions of the following difference equation xn+1 = xn + xn−1 + xn−2 + xn−3 Axn + Bxn−1 + Cxn−2 + Dxn−3 , n = 0, 1, 2, ..... where the coefficients A,B,C,D, , , , , and the initial conditions x−3, x−2, x−1, x0 are arbitrary positive real numbers.
Phytochemical and pharmacological screening of Sargassium vulgare from Suez Canal, Egypt
Mohamed A. Shreadah,Nehad M. Abd El Moneam,Samy A. Al-Assar,Asmaa Nabil-A 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.4
The current study investigates the phytochemical and pharmaceutical activities of Sargassium vulgare (SVE) collected from the Suez Canal. The prescreening using cytotoxicity was tested against hepatocellular carcinoma cell lines. Furthermore the SVE inhibit cell growth effectively with IC50 = 20.8 lg/ml. The pharmacological studies revealed high antioxidant capacity at all examined concentrations. On the meantime, anticancer assay carried out using tyrosine kinase (PTK) and sphingosine kinase 1 inhibitor screening assays revealed inhibition with 75.73 and 80.01%; respectively. Furthermore, the anti-inflammatory profiling revealed that the activities against COX1, COX2, IL6 and TNF were 77.39, 88.35, 75.38 and 71.24%; respectively. Additionally, the anti-Alzheimer results showed high activity at 1 mg with 76.33%. Finally the antiviral activities using reverse transcriptase inhibition assay give 92.24%. Consequently, it can be easily conclude that the SVE collected from the Suez Canal are excellent source of natural products for nutritional and pharmaceutical applications.
Ziziphus spina-christi based bio-synthesis of Ag nanoparticles
Mervat F. Zayed,Wael H. Eisa,Yasser K. Abdel-Moneam,Salah M. El-kousy,Ahmed Atia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The bio-production of silver nanoparticles (Ag NPs) using Ziziphus spina-christi extract was studied as a novel, rapid, low-cost and eco-friendly route. The impact of experimental factors, such as the extract quantity, precursor concentration and pH on the size and size distribution of Ag NPs, was studied with the aid of UV–vis spectrophotometer and transmission electron microscope (TEM). The FTIR analysis was carried out to identify the functional groups in Ag NPs. The as-synthesized Ag NPs was used as a catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH4.