Male infertility is a multifactorial syndrome encompassing a wide variety of disorders. In more than half of infertile men, the cause of their infertility is mysterious (idiopathic) and could be congenital or acquired. The causes are known in less than half of these cases, out of which genetic or inherited disease and specific abnormalities in the Y chromosome are major factors. About 10-20 percent of males presenting without sperm in the ejaculate carry a deletion of the Y chromosome Male genetic factor of infertility accounts for about half the cases of couple infertility and in around 50% of cases its etiology remains unknown. Molecular genetic techniques have unveiled a number of etiopathogenetic factors, including microdeletions of the Yq. Y chromosome microdeletions removing the AZoospermia Factor (AZF) regions are the most frequent molecular genetic causes of oligo/azoospermia).

The present investigation was carried out to follow up the population fluctuations of these Coccoidea on mango trees under the conditions of Esna district, Qena Governorate, A.R. of Egypt. There are four different scale insects and one mealybugs species infested mango trees at Esna district. These species are Insulaspis pallidula, Aonidiella aurantii, Kilifia acuminata, Pulvinaria psidii and mealybugs, Icerya seychellarum. The Maskell scale insect, Insulaspis pallidula, had four generations, which were recorded in May, July, October and December in the two years of investigation. While, the California red scale insect, Aonidiella aurantii had four generations (April, June, October and December) in the two years of investigation. As well as, the Acuminata scale, Kilifia acuminata had two generations in June and November in the two years of investigation. Whereas, The Seychelles fluted scale, Icerya seychellarum had three generations in May, August and October in the two years of investigation.

Dr. mohamed Sabry El Morsy an electromechanical specialist with more than 12 years experience in the design, installation, commissioning and testing of electromechanical equipment for water and waste treatment plants, boosting stations. Over 5 years experience with development projects funded by International Finance Institutions (IFI) such as the World Bank and the KFW in Egypt where he conducted several technical studies and supervised the implementation of mechanical equipment in several water and wastewater treatment plants. Involved in design of tender documentation and tendering of water and sanitation projects Earned an excellent experience with industrial codes and other international standards applied for mechanical equipment, such as the Egyptian codes, ASME, AWWA, and CEMA standards. An extensive experience in 3D modelling using various modelling software. Experience in Design & Operation of Water Treatment Plant; Plants and facilities layout design Experience in Operation Research and Project Management; Sound and vibration measurement & Analysis Participating as instructor and trainer in series of engineering training courses and technical assistance.

Phylogeny is the study of evolutionary relatedness among various groups of organism. Molecular phylogeny has also revealed that horizontal transfer plays an important and unexpected role in evolution. Phylogenetic analysis has shown that E. coli strains fall into four main phylogenetic groups (A, B1, B2, and D). the phylogeny groups of E. coli are distributed into intestinal and extraintestinal. There are three markers used in the phylogenetic analysis of E. coli as follows: - chuA, yjaA, and TspE4.C2. The presence of pathogenicity islands is one of the most indicator of the possession of E. coli of virulence factors. Pathogenicity of E. coli has been correlated with the presence of gene encoding for one or more virulence factors including (adhesins P and S fimbriae), iron acquisition systems (e.g., aerobactin), and toxin (e.g., hemolysin).

In recent years, telecommunication operators are constantly seeking more efficient wireless broadband service, while tele-communication technology is continuously upgrading its access network technologies to cope with the high demands for high-speed internet access and multimedia service by end-users. WiMAX seems to be the solution as it is able to provide easy deployment, high speed data rate and wide range coverage. Most importantly, WiMAX provides Quality of Service (QoS) that can support all kinds of real-time application in wireless networks that includes priority scheduling and queuing for bandwidth allocation that is based on traffic scheduling algorithms within wireless networks. This book aims to evaluate the implementation of the various types of scheduling algorithms of WiMAX wireless network technology namely: Diffserv-Enabled (Diffserv), Round Robin (RR), Self-Clocked-Fair (SCF), Strict-Priority (SP), Weighted-Fair Queuing (WFQ) and Weighted-Round Robin (WRR). A detailed simulation study via the QualNet 4.5 simulator evaluation version was carried out with the aim to analyze and evaluate the performance of each scheduler to support the different QoS classes.