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Dynamics of Recursive Sequence of Order Two
Elsayed, Elsayed Mohammed Department of Mathematics 2010 Kyungpook mathematical journal Vol.50 No.4
In this paper we study some qualitative behavior of the solutions of the difference equation $x_{n+1}=ax_n=\frac{bx_n}{cx_n-dx_{n-1}}$, n=0,1,$\ldots$, where the initial conditions x-1, x0 are arbitrary real numbers and a, b, c, d are positive constants with $cx_0-dx_{-1}\neq0$.
Elsayed, Elsayed Ahmed,Sharaf-Eldin, Mahmoud A.,Wadaan, Mohammad Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.11
Moringa oleifera Lam. (Moringaceae) is widely consumed in tropical and subtropical regions for their valuable nutritional and medicinal characteristics. Recently, extensive research has been conducted on leaf extracts of M. oleifera to evaluate their potential cytotoxic effects. However, with the exception of antimicrobial and antioxidant activities, little information is present on the cytotoxic activity of the essential oil obtained from M. oleifera seeds. Therefore, the present investigation was designed to investigate the potential cytotoxic activity of seed essential oil obtained from M. oleifera on HeLa, HepG2, MCF-7, CACO-2 and L929 cell lines. The different cell lines were subjected to increasing oil concentrations ranging from 0.15 to 1 mg/mL for 24h, and the cytotoxicity was assessed using MTT assay. All treated cell lines showed a significant reduction in cell viability in response to the increasing oil concentration. Moreover, the reduction depended on the cell line as well as the oil concentration applied. Additionally, HeLa cells were the most affected cells followed by HepG2, MCF-7, L929 and CACO-2, where the percentages of cell toxicity recorded were 76.1, 65.1, 59.5, 57.0 and 49.7%, respectively. Furthermore, the $IC_{50}$ values obtained for MCF-7, HeLa and HepG2 cells were 226.1, 422.8 and $751.9{\mu}g/mL$, respectively. Conclusively, the present investigation provides preliminary results which suggest that seed essential oil from M. oleifera has potent cytotoxic activities against cancer cell lines.
Resistin and Insulin Resistance: A Link Between Inflammation and Hepatocarcinogenesis
Elsayed, Engy Yousry,Mosalam, Nesreen Ahmed,Mohamed, Noha Refaat Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: Hepatocellular carcinoma (HCC) is the sixth most common cancer and the third leading cause of cancer related death overall. The role of insulin resistance in the development of HCC associated with chronic HCV infection has not been established. Resistin is a polypeptide hormone belonging to the adipokine family which could contribute to tumorigenesis and angiogenesis. Our aim was to study serum resistin and insulin resistance as risk factors for HCC in HCV cirrhotic patients. Materials and Methods: This prospective case controlled study included 100 patients with HCV related liver cirrhosis and HCC, 100 patients with HCV related liver cirrhosis without HCC and 50 apparently healthy participants as controls. For all subjects, liver profile, serologic markers for viral hepatitis, lipid profile, alpha-fetoprotein level (AFP), homeostasis model assessment (HOMA) were examined along with resistin. Results: HCC patients had higher mean values of HOMA-IR and resistin than cirrhotic patients and the control subjects (p<0.01). HOMA and resistin were considered independent risk factors in development of HCC, those patients with resistin > 12 ng/ml and HOMA > 4 being 1.6 times more likely to have HCC. Conclusions: HOMA and serum resistin allow for early identification of patients with cirrhosiswho are at substantially increased risk of HCC. Recommendation: HOMA and serum resistin could represent novel markers to identify HCV cirrhotic patients at greater risk of development of HCC.
Molecular Marker Assisted for Recognition Drought Tolerant in Some of Bread Wheat Genotypes
ElSayed, Abdelaleim Ismail,Rafudeen, Muhammad Suhail 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.1
To develop crop plants with enhanced tolerance of drought stress, a basic understanding of physiological, biochemical, and genetic networks is essential. Four bread wheat genotypes and one wheat line were evaluated for molecular indicators of drought tolerance using RAPD-PCR and protein profiling. The RAPD markers were used to determine the genetic differences between the five wheat genotypes and to determine the molecular markers associated with tolerance to drought. The present study found that RAPD analysis is a valuable diagnostic tool when different sets of RAPD primers were used to study the polymorphism at the molecular level. A total of 72 alleles were amplified with six random primers out of which 61% were monomorphic and 38% were polymorphic. Primer B8 amplified a 600 bp band in Sham-6 which is assumed to be a drought-tolerant genotype, while primer A-8 amplified a 550 bp band in genotypes Giza-168 and Sham-6. Genetically, the most similar genotypes were Sham-6 and Line-7 (93%) followed by Gemaza-9 and Giza-168 (92%) while the most dissimilar genotype was Sakha-93 (86%). Protein profiling revealed differences between the genotypes with a protein band presents at 130 KDa in the Sham-6, Gemaza-9, and Sakha-93 genotypes and absent in Line-7 and Giza-168. Proline content was highest in the drought-tolerant genotypes, Sham-6 and Sakha-93. Sucrose content in shoots was increased in tolerant plants (Sakha-93 and Sham-6), while there was a reduction in sucrose in the shoot tissues of the seedling stage of Gemaza-9, Line-7, and Giza-168. Overall, the accumulation of reducing sugars was lowest in all plants compared with sucrose content.
Simulation Study of a New Approach for Field Weakening Control of PMSM
Elsayed, Mohamed Taha,Mahgoub, Osama Ahmed,Zaid, Sherif Ahmed The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.1
In this paper, the different techniques for the field weakening, also known as constant power speed range (CPSR) operation, for permanent magnet synchronous motor (PMSM) will be introduced and analysed. Field weakening of PMSM, can be done using either vector control (VC) or conventional phase in advance (CPA). Implementation of these techniques depending on some features and constrains. Most of these features and constrains came from the motor parameters. One of these constrains is the motor inductance which determining whether the motor can be driven in the CPSR or not. A new approach for the field weakening will be discussed and to be verified to overcome this constrain. The new approach will be verified through both techniques VC and CPA.
New Cellular Neural Networks Template for Image Halftoning based on Bayesian Rough Sets
Elsayed Radwan,Basem Y. Alkazemi,Ahmed I. Sharaf International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.4
Image halftoning is a technique for varying grayscale images into two-tone binary images. Unfortunately, the static representation of an image-half toning, wherever each pixel intensity is combined by its local neighbors only, causes missing subjective problem. Also, the existing noise causes an instability criterion. In this paper an image half-toning is represented as a dynamical system for recognizing the global representation. Also, noise is reduced based on a probabilistic model. Since image half-toning is considered as 2-D matrix with a full connected pass, this structure is recognized by the dynamical system of Cellular Neural Networks (CNNs) which is defined by its template. Bayesian Rough Sets is used in exploiting the ideal CNNs construction that synthesis its dynamic. Also, Bayesian rough sets contribute to enhance the quality of the halftone image by removing noise and discovering the effective parameters in the CNNs template. The novelty of this method lies in finding a probabilistic based technique to discover the term of CNNs template and define new learning rules for CNNs internal work. A numerical experiment is conducted on image half-toning corrupted by Gaussian noise.
Elsayed Elkhatib,Mohamed Moharem,Ayman Mahmoud 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.6
The goal of this study was to produce a novel nano-scale material from nitrogen fertilizer industry byproduct (nNFIB) and assess its capability to remediate Cu contaminated wastewater and soil. The novel nNFIB was produced using planetary mono mill and characterized. Equilibrium and kinetics studies of Cu sorption by nNFIB were performed in batch system. The effects of a variety of factors, including pH, coexisting ions and adsorption time on Cu adsorption were investigated. Furthermore, Cu sequestration mechanism onto nNFIB was investigated using sequential extraction technique and Fourier transform infrared (FTIR) spectra before and after nNFIB adsorption. The Cu sorption equilibrium and kinetics data were successfully described by Langmuir and first-order models, respectively. The calculated maximum Cu(II) adsorption capacity (qmax) of nNFIB (100 mg g−1) was four times higher than qmax of bulk NFIB. Copper removal by nNFIB was quite fast (around 86%) in the first 5 min and gradually slowed down until achieved 100% removal at equilibrium time. The FTIR spectra and Cu fractionation data in biosolid-amended soil demonstrated that Cu sequestration in contaminated water and soil is strongly related to CaCO₃ of nNFIB. The overall findings show the potential use of nNFIB as a best management practice for Cu removal from wastewater and Cu stabilization in contaminated biosolid-amended soils.
Elsayed M. Abdel Bary,Ammar N. Harmal,Mona E. Ibrahim,Moustafa A. Gouda 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Novel chitosan nanoparticles (SCN) were synthesized via reaction of chitosan with different concentration of 2-chloro-N-(3-methylisoxazol-5-yl) acetamide (5 %, 10 % and 15 %) at 70-80 oC for 7 h to give the grafted polymer, whichcondensed with cyclohexanone Mannich base 45 oC for 7 h to afford the corresponding (SCN). These were stirred withDeflazacort drug to achieve the Deflazacort loading (SCN), which, compressed with calcium starch glycolate (CaSgly) togive the corresponding tablets. The pH 2. 1 and concentration of SCN-10 %/CaSgly (1:4) was found to be importantparameters in controlling the release profiles.
Elsayed Ayman Khamis,Kawakita Atsushi 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
The genus Gephyraulus Rübsaamen (Diptera: Cecidomyiidae) is newly recorded on Fabaceae and in Japan. Gephyraulus tokudai Elsayed n. sp. that develops in the flower buds of Caesalpinia crista L. (Fabaceae) is described here as new to science. A description, illustrations, and ecological features of the new species are given. In addition, a molecular phylogenetic analysis including the new species, G. zewaili and G. lycantha, each from a different host plant family, indicated that Gephyraulus is a polyphyletic genus.
Using nano-magnesium oxide/bentonite composite for cadmium removal from industrial wastewater
Elsayed A. Elkhatib,Mohamed L. Moharem,Ahmed F. Saad,Farida A. Attia 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2
Nowadays, the removal of toxic heavy metals from industrial wastewater is a long standing problem due to the industrial progress worldwide. This study mainly focused on the production of a novel nMgO-bentonite nanocomposite using sol–gel method to enhance Cd ions removal from industrial wastewater. The nMgO-bentonite nano-composite was characterized for structural morphology and presence of functional groups using SEM/EDS, XRD and FTIR analysis. Cadmium sorption equilibrium and kinetic data were well fitted to Langmuir and power function models respectively as confirmed by the highest R² (0.965), and the lowest SE (38<SUP>*</SUP>10<SUP>-6</SUP>) values among other studied models. The Langmuir removal capacity of the nanocomposite is 200 ㎎/g which is 60 times greater than that of bentonite. Increased Cd sorption on nano-composite with increased temperature from 287 to 307K and the thermodynamic results revealed that Cd adsorption process was endothermic and spontaneous. The data also showed highly repetitive application of nano-composite during six cycles of adsorption/ desorption experiment. The final results pointed out that nMgO-bentonite nano-composite has great adsorption affinity for Cd and could potentially employ as a cost-effective, ecofriendly and efficient sorbent for Cd removal from contaminated wastewater.