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Search Results: 1 - 10 of 9000 matches for " Mohamed Fayez "
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The Impact of Ownership Structure on Capital Structure: An Empirical Study on the Most Active Firms in the Egyptian Stock Exchange  [PDF]
Mohamed Fayez, Aiman A. Ragab, Mohamed Moustafasoliman
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105266
This study aims to find the most relative ownership structure related factors of influencing capital structure of top 50 non-financial firms listed in Egyptian exchange from 2012 to 2017. The study found that the hypotheses from one to six that are explaining the relationship between Ownership Structure and Capital Structure are partially supported. Also, the study explaining the effect of Firm Age and Company Size on Capital Structure is partially supported.
Specialty Lipids in Health and Disease  [PDF]
Fayez Hamam
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.49A1011

Lipids possess a wide range of biological activities in plants, animals and humans. They also serve as important components of our daily diet and provide both energy and essential fatty acids; they also act as carriers of fat-soluble vitamins and help in their absorption. Lipids are crucial as a heating medium for food processing and affect the texture, mouth feel and flavour of foods. Structured lipids (SL) are triacylglycerols (TAG) modified to alter the fatty acid composition and/or their location in the glycerol backbone via chemical or enzymatic means. SL may offer the most efficient means of delivering target fatty acids for nutritive or therapeutic purposes as well as to alleviate specific disease and metabolic conditions. This document discusses chemistry, composition, classification, function, occurrence in food and biological activities of lipids. It also sheds light on different aspects of structured lipids, including SL applications, synthesis (chemical vs. enzymatic), SL and aquaculture and future considerations for SL.

Curcumin: New Weapon against Cancer  [PDF]
Fayez Hamam
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.522239
Abstract: All the evidences point out to the fact that the incidence, mortality and number of persons living with cancer are on the rise and, thus, this will impose a significant burden on health care resources. The considerable number of deaths from cancer necessitates the need to developing novel alternative cures that are efficient, safe, cheap and easy to use. In the search for new therapies for tumors, naturally-derived compounds have been considered as a good source of novel anticancer drugs. The challenge here is to find products that are pharmacologically active against tumor cells with suitable toxicity profile and least damage to normal cells. Curcumin is a spice widely used in many countries especially in South Asia and it has gained importance for its anticancer function and low toxicity toward normal tissues in a range of biological systems. In spite of significant research works, many difficulties hinder its oral use in the therapy of different kind of tumors, such as extreme low solubility in water, quick break down and excretion after being absorbed in the human body. Low bioavailability due to enhanced metabolism and rapid system elimination is another problem that hinders oral use of curcumin as anticancer agent. Therefore, the previously mentioned poor pharmacokinetics characteristics inhibit curcumin from reaching its site of action and, thus, lessen its effectiveness against tumors. This article reviews the latest global cancer statistics with special attention to be directed toward ovarian cancer. It sheds light on many research works that investigated the protective and therapeutic functions of different curcumin preparations against different sites of cancer using animal models. It also summarizes recent research works concerning the antitumor effects of curcumin alone and/or loaded into a range of delivery devices in many types of ovarian cancer cell lines. In the last section, it discusses the latest research work with regard ovarian cancer in the kingdom of Saudi Arabia.
Dyslipidemia and Related Risk Factors in a Saudi University Community  [PDF]
Fayez Hamam
Food and Nutrition Sciences (FNS) , 2017, DOI: 10.4236/fns.2017.81004
Abstract: Background/Objectives: Cardio vascular diseases (CVD) are considered a serious and prompt growing health problem in the Kingdom of Saudi Arabia, since it is the leading cause of morbidity and mortality. This study aimed to assess the prevalence of dyslipidemia and related risk factors among Health Sciences students in Taif University, KSA. Subjects/Methods: A sample of 80 students aged 17 - 26 years, were selected randomly from the Health Sciences colleges, Taif University. Participants were screened for blood lipid profile, obesity/overweight and related risk factors through filling pretested food frequency questionnaire. Anthropometric measurements and fasting blood samples were taken for determination of blood lipid profile, namely total cholesterol (TC), low density lipoprotein-cholesterol (LDL-c), high density lipoprotein-cholesterol (HDL-c), triacylglycerol (TAG) and the ratio of TC/ HDL-c. Results: The prevalence of hypercholesterolemia (TC ≥ 200 mg/dl), hypertriglyceridemia (TAG ≥ 150 mg/dl), high LDL-c (≥130 mg/dl), low HDL-c (<40 mg/dl) was 17.7%, 5.0%, 16.8%, and 46.3%, respectively. The overall prevalence of dyslipidemia was 60.0%. Low HDL-c levels were the main prevalent dyslipidemia among participants. Overweight/obese students were more likely to show at least one undesirable lipid concentration. BMI, W_C, and academic level were significantly associated with unacceptable levels of HDL-c. TV viewing or computer/video games had significant effects on hypercholesterolemia, while only liver intake had significant impact on high TAG. Conclusions: Lipid study showed that dyslipidemia is very common and a significant health problem among university students of Taif University.
Totally Endoscopic (Thoracoscopic and Laparoscopic) Radical Esophagectomy with Gastric Tube Reconstruction through a Small Neck Incision: An Early Experience with Thirty Egyptian Patients  [PDF]
Adel Denewer, Adel Fathi, Ahmed Setit, Mohamed Hegazy, Ashraf Khater, Osama Hussein, Sameh Roshdy, Fayez Shahatto, Fathy Denewer
Surgical Science (SS) , 2014, DOI: 10.4236/ss.2014.55037

Background: Minimally invasive esophagectomy nowadays is replacing the classic open technique. Additional studies are needed to confirm its safety and efficacy. Methods: thirty patients with esophageal carcinoma were enrolled in this study. Patients were evaluated preoperatively and they underwent thoracoscopic and laparoscopic procedures for assessment of resectability. Resectablepatients underwent radical esophagectomy with gastric tube reconstruction through a four-cm neck incision. Results: 17 patients were operable and 13 patients were inoperable. The mean operative time for the whole procedure was 5.97 ± 1.66 hours. The mean blood loss was 250 ± 138.07 cc. The mean overall hospital stay was 17.47 ± 5.49 daysdays. Common postoperative complications included pneumonia (13.3%) pleural effusion (6.7%), cervical anastomotic leakage (10%), and wound infection (13.3%). One patient died in the early postoperative period. Conclusions: we conclude that totallyendoscopic (thoracoscopic and laparoscopic) esophagectomy is feasible and relatively safe technique. Beside its efficacy as an assessment tool, total esophagectomy and lymphadenectomy could be performed in the same time.

Properties of Titanium Oxynitride Prepared by RF Plasma  [PDF]
Fayez M. El-Hossary, Niemat Z. Negm, Ahmed M. Abd El-Rahman, Mohamed Raaif, Alzahraa A. Abd Elmula
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.51001
Abstract: Titanium oxynitrides combine the properties of metallic oxides and nitrides. In this presentation, titanium was oxynitrided using inductively coupled RF plasma in a gas mixture containing 80% N2 and 20% O2. The effect of plasma-processing power from 350 up to 550 W on microstructure, mechanical, tribological, wettability and electrochemical properties of the oxynitrided titanium was examined using different characterizations and testing techniques. The results demonstrated the formation of TiO, TiO2 rutile phase, TiNxOy and Ti2N as a result of plasma oxynitriding. The micro-hardness of the oxynitrided layers increases up to 766 HV0.1 as the plasma-processing power increases up to 550 W. The wear and corrosion resistance are improved for oxynitrided titanium in comparison with untreated samples. Moreover, the friction coefficient decreases from nearly 0.75 for the pure titanium to nearly 0.3 for oxynitrided titanium. The obtained data show an increase of surface energy and wettability of titanium oxynitride as the plasma power increases. The formation of hard oxide and oxynitride phases and the transformation of TiO2 from anatase to rutile structure at relatively high temperature are the main reasons for the good physical and electrochemical properties of titanium oxynitride.
Growth Rate Assessment of Alcyonacean Sarcophyton glaucum from Northern Hurghada, Red Sea, Egypt  [PDF]
Tarek A. A. Mohammed, Abdel-Hamid A. Ali, Mohamed M. El-Komi, Mohammed A. H. Ezz El-Arab, Fayez A. M. Shoukr
Natural Resources (NR) , 2016, DOI: 10.4236/nr.2016.76033
Abstract: Eighteen specimens of the soft coral Sarcophyton glaucum have been collected and tagged to determine the growth rate using the weight variations technique and to investigate the reproductive season histologically. Six colonies were totally weighed and 12 fragments (produced from three colonies) were marked and weighed. Some samples showed sever shrinkage that lead to death. The maximum semiannual growth rate was recorded in summer (30.05 gm/6 m). The average monthly growth reached 3.95 gm/month. Many factors affect the growth rate such as water currents, turbidity, sedimentation, temperature and reproduction process. The studied species is a dioecious species (unisex), where the Autozooid polyps are the reproductive organs while siphonozooids are sterile. Female gonads were observed to develop at late July before male gonads which began at late September. Larvae releasing started at late January and the gonads are completely spawned in February. Fertilization occurs internally to form planulae larvae which librated completely in February. The oogenesis exhibited prolonged about 23 months, which gave rise to oocytes of different developmental stages in female colonies at any given time, and a spermatogenic cycle of only 10 - 12 months.
Assessment of Levels of Knowledge towards Hormonal Related Breast Cancer Risk Factors in Qurayyat, Northern Saudi Arabia  [PDF]
Abdelbaset Mohamed Elasbali, Elyasa Mustafa Elfakia Mohammed, Ziad Alonzi, Rania Abdeen Hussain Abdalla, Azizah Mazi Aldaham, Diem Fayez Aljubab, Naif Muflih Alsharari, Hussain Gadelkarim Ahmed
Open Journal of Obstetrics and Gynecology (OJOG) , 2019, DOI: 10.4236/ojog.2019.93038
Abstract: Background: Continued exposure to sex hormones such as estrogen is a critical risk for subsequent breast cancer. Thus the present study aimed to assess the levels of knowledge towards hormonal related breast cancer risk factors in Qurayyat, Northern Saudi Arabia. Methodology: This descriptive study included 737 Saudi volunteers living in the city of Qurayyat, Northern Saudi Arabia. For females, only those agreeing to participate in the breast self-examination workshop were included, and non-respondents were included in the questionnaire. Results: For the question apropos “Inheritance as a risk factor for BC,” 405/607 (66.7%) females signposted certainly “Yes,” as well as, 70/130 (54%) males signposted certainly “Yes.” The odds ratio (OR) and 95% confidence interval (95% CI) were not statistically significant, but the level of knowledge was relatively higher among females OR (95% CI) = 1.4321 (0.9597 to 2.1370), P = 0.0786. Are early puberty and late menopause risk factors for breast cancer?
Analyzing Security Threats to Virtual Machines Monitor in Cloud Computing Environment  [PDF]
Ahmad Fayez S. Althobaiti
Journal of Information Security (JIS) , 2017, DOI: 10.4236/jis.2017.81001
Abstract: The data and applications in cloud computing reside in cyberspace, that allowing to users access data through any connection device, when you need to transfer information over the cloud, you will lose control of it. There are multi types of security challenge must be understood and countermeasures. One of the major security challenges is resources of the cloud computing infrastructures are provided as services over the Internet, and entire data in the cloud computing are reside over network resources, that enables the data to be access through VMs. In this work, we describe security techniques for securing a VCCI, VMMs such as Encryption and Key Management (EKM), Access Control Mechanisms (ACMs), Virtual Trusted Platform Module (vTPM), Virtual Firewall (VF), and Trusted Virtual Domains (TVDs). In this paper we focus on security of virtual resources in Virtualized Cloud Computing Infrastructure (VCCI), Virtual Machine Monitor (VMM) by describing types of attacks on VCCI, and vulnerabilities of VMMs and we describe the techniques for securing a VCCI.
Comparison of Ontology-Based Semantic-Similarity Measures in the Biomedical Text  [PDF]
Ahmad Fayez S. Althobaiti
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.52003
Abstract: In recent years, there are many types of semantic similarity measures, which are used to measure the similarity between two concepts. It is necessary to define the differences between the measures, performance, and evaluations. The major contribution of this paper is to choose the best measure among different similarity measures that give us good result with less error rate. The experiment was done on a taxonomy built to measure the semantic distance between two concepts in the health domain, which are represented as nodes in the taxonomy. Similarity measures methods were evaluated relative to human experts’ ratings. Our experiment was applied on the ICD10 taxonomy to determine the similarity value between two concepts. The similarity between 30 pairs of the health domains has been evaluated using different types of semantic similarity measures equations. The experimental results discussed in this paper have shown that the Hoa A. Nguyen and Hisham Al-Mubaid measure has achieved high matching score by the expert’s judgment.
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