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Strongyloides hyper-infection causing life-threatening gastrointestinal bleeding

World Journal of Gastroenterology 2006年第39期12卷 6401-6404页

作者： Lajos Csermely Hassan Jaafar Jorgen Kristensen Antonio Castella Waldemar Gorka Ahmed ali Chebli fawaz Trab Hussain alizadeh Béla Hunyady County Hospital Zalaegerszeg Hungary Tawam Hospital Al-Ain Abu Dhabi United Arab Emirates First Department of Medicine University of Pécs Hungary Correspondence to: Professor Béla Hunyady MD PhD DSc

A 55-year old male patient was diagnosed with strongy- loides hyper-infection with stool analysis and intestinal biopsy shortly after his chemotherapy for myeloma. He was commenced on albendazole anthelmintic therapy. After initiation of the treatment he suffered life- threatening gastrointestinal (GI) bleeding. Repeated endoscopies showed diffuse multi-focal intestinal bleeding. The patient required huge amounts of red blood cells and plasma transfusions and correction of haemostasis with recombinant activated factor Ⅶ. Abdominal aorto-angiography showed numerous micro- aneurysms (‘berry aneurysms’) in the superior and inferior mesenteric arteries’ territories. While the biopsy taken prior to the treatment with albendazole did not show evidence of vasculitis, the biopsy taken after initiation of therapy revealed leukoclastic aggregations around the vessels. These findings suggest that, in addition to direct destruction of the mucosa, vasculitis could be an important additive factor causing the massive GI bleeding during the anthelmintic treatment. This might result from substances released by the worms that have been killed with anthelmintic therapy. Current guidelines advise steroids to be tapered and stopped in case of systematic parasitic infections as they might reduce immunity and precipitate parasitic hyper-infection. In our opinion, steroid therapy might be of value in the management of strongyloides hyper- infection related vasculitis, in addition to the anthelmintic treatment. Indeed, steroid therapy of vasculitis with other means of supportive care resulted in cessation of the bleeding and recovery of the patient.

关键词：胃肠疾病免疫反应病理机制临床

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Crosslinguistic Influence of the First Language: Interlingual errors in the writing of ESL Saudi learners

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宏观语言学 2020年第2期8卷 105-120页

作者： fawaz ali Ahmed Qasem University of Bisha Kingdom of Saudi Arabia

Writing as a productive skill is challenging for the learners as it requires rich linguistic and cognitive abilities to match words with ideas well. A learner of any language as Second Language (SL), for example English, Arabic, Chinese, or German, enters an early, natural, and inevitable stage of making various errors in writing compositions. The errors could be due to dissimilar linguistic systems of the two languages (L1 and L2) or the lack of understanding the SL linguistic rules. This study focuses on investigating the frequent and common inter-lingual errors (the negative influence) committed by Arabic-speaking learners of English as Second Language (ESL). The study is based on Error Analysis (EA) of the essays of a group of English major undergraduate students from the University of Bisha, al-Namas, Saudi Arabia. Contrastive Analysis Hypothesis (CAH)is included to predict most of the errors in the collected samples. The findings of the study show that common errors in the data are interlingual (54.03%). The errors within the Grammatical Category include the misuse of tenses, dropping the subjects, dropping verb to be-copular and word order misplacement. The majority of errors in the study are due to the interference of L1 linguistic system including the different orthographic, phonological,morpho-syntactic components. For instance, the participants’ dropping subjects in English can be attributed to the fact that Arabic as L1 and as Null Subject Language (NSL), unlike English, allows subject drop. The results also find that within the Lexical Category,preposition and article errors are the most frequent errors and that spelling errors are the most dominant errors within the Mechanics Category. The study gives some pedagogical implications and suggestions to avoid and minimize the interlingual errors of such type. For instance, teachers need to focus more on enlightening their students about the contrastive language systems from the early stage of learning ESL.

关键词： English as second language interlingual errors error analysis contrastive analysis

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Securing Fog Computing For E-Learning System Using Integration of Two Encryption algorithms

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Journal of Cyber Security 2021年第3期3卷 149-166页

作者： Hind A.alshambri fawaz alassery Department of Information Technology Taif UniversityAl-HawiyaTaif 21974Saudi Arabia Department of Computer Engineering Taif UniversityAl-HawiyaTaif 21974Saudi Arabia

Currently,the majority of institutions have made use of information technologies to improve and develop their diverse educational methods to attract more *** information technologies,e-learning and learning-on-the go have been adopted by the institutions to provide affordability and flexibility of educational *** of the educational institutes are offering online teaching classes using the technologies like cloud computing,networking,*** institutes have developed their e-learning platforms for the online learning process,through this way they have paved the way for distance *** e-learning platform has to face a lot of security challenges in terms of cyberattacks and data hacking through unauthorized *** computing is one of the new technologies that facilitate control over access to big data,as it acts as a mediator between the cloud and the user to bring services closer and reduce their *** report presents the use of fog computing for the development of an e-learning *** introduced different algorithms to secure the data and information sharing through e-learning ***,this report provides a comparison among RSA,AES,and ECC algorithms for fog-enabled cybersecurity *** algorithms are compared by developing them using python-based language program,in terms of encryption/decryption time,key generations techniques,and other features *** addition,we proposed to use a hybrid cryptography system of two types of encryption algorithms such as RSA with AES to fulfill the security,file size,and latency required for the communication between the fog and the e-learning *** tested our proposed system and highlight the pros and cons of the Integrated Encryption Schemes by performing a testbed for e-learning website scenario using *** and C#.

关键词： Fog computing information security integrated encryption RSA AES ECC e-learning system

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