Ahmed Hamza Osman

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Cryptosporidium is a significant cause of diarrheal disease in developing and industrialized nations. Cryptosporidium hominis and Cryptosporidium parvum are the main agents of cryptosporidiosis in humans. In Egypt, very little is known about genetic structure of Cryptosporidium spp. Therefore, this study was designed to examine samples from sporadic cases(More)
Smad proteins are essential intracellular signal transducers of the transforming growth factor-beta (TGF-beta) superfamily. The TGF-beta superfamily signals through phosphorylation and activation of R-Smad proteins, receptor-regulated Smads, by heteromeric complexes of ligand-specific type I and type II serine/threonine kinase receptors. R-Smads receive a(More)
Schistosome parasites have co-evolved an intricate relationship with their human and snail hosts as well as a novel interplay between the adult male and female parasites. We review the role of the TGF-beta signaling pathway in parasite development, host-parasite interactions and male-female interactions. The data to date support multiple roles for the(More)
Members of transforming growth factor-beta (TGF-beta) superfamily play pivotal roles in development in multicellular organisms. We report the functional characterization of the Schistosoma mansoni type II receptor (SmTbetaRII). Mining of the S. mansoni expressed sequence tag (EST) database identified an EST clone that shows homology to the kinase domain of(More)
Protein-protein interactions occur in a wide variety of biological processes and essentially control the cell fate from division to death. Today, the identification of proteins that interact with a protein of interest is a focus of intensive research and is an essential element of the rapidly growing field of proteomics. Yeast two-hybrid assays represent a(More)
Members of the transforming growth factor (TGF)-beta superfamily play pivotal roles in cell migration, differentiation, adhesion, pattern formation, and apoptosis. The family of Smad proteins acts as intracellular signal transducers of TGF-beta and related peptides. Smad4, a common mediator Smad (co-Smad), performs a central role in transmitting signals(More)
Schistosoma mansoni, a multicelluar eukaryotic blood fluke, is a major cause of morbidity worldwide in humans. The study of female parasite growth, development, and gene regulation is important because the eggs produced are responsible for the pathogenesis observed in schistosomiasis. p14, an eggshell precursor gene expressed only in sexually mature females(More)
The features are considered the cornerstone of text summarization. The most important issue is what feature to be considered in a text summarization process. Including all the features in the summarization process may not be considered as an optimal solution. Therefore, other methods need to be deployed. In this paper, random five features used and(More)
ADP-ribosyl cyclases are structurally conserved enzymes that are best known for catalyzing the production of the calcium-mobilizing metabolite, cyclic adenosine diphosphate ribose (cADPR), from nicotinamide adenine dinucleotide (NAD(+)). However, these enzymes also produce adenosine diphosphate ribose (ADPR) and nicotinic acid adenine dinucleotide phosphate(More)