http://localhost:8080/xmlui/handle/123456789/530 Fri, 16 Oct 2026 03:18:32 GMT 2026-10-16T03:18:32Z http://localhost:8080/xmlui/handle/123456789/576 Sero-Prevalence and Risk Factors of Hepatitis C Virus among Yemeni Dental Clinic Workers Abbas Al-Kebsi1; Khaled Al-Gafary1; Arwa Othman2; Ebtihal Madar2; Hassan Al-Shamahy2; Al-Kasem Abbas3; Samera Daname4; Foud Al-Motarab5; Wedad M. Al-Haik6; Ahmed Al- Haddad7 The Dental clinic workers (DCWs) in Yemen have an additional risk of getting infected with hepatitis C virus (HCV) from their work place and till now there is no study in prevalence of HCV infection and associated risk factors among DCWs. The purposes of this survey were to evaluate what proportion of dentists and dental assistants had serological evidence of current or previous HCV infection. Data were acquired from a cross sectional survey conducted among DCWs in 2014 at the Faculty of Dentistry, Sana’a University, in Sana›a city. Enzymelinked Immunosorbant assay (ELISA) was used to test sera for HCV antibodies. The study included 246 dentists and 263 dental assistants; the sero-prevalence of current HCV infection was 1.6%. In conclusion, the prevalence of HCV infection was high among Yemeni DCWs and exposure to potentially infectious body fluids was high which might lead to high rate of transmit HCV to DCWs, therefore ensures a safer work environment is important in control and prevention of HCV in DCWs in Yemen. Thu, 01 Jun 2017 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/576 2017-06-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/575 An Investigation into University Students’ Errors in Tenses in their Written Production Zeinab Al-atta Saeed; Abdallah Yassin The study aimed to investigate university student’s errors in English tenses, in their written production. The researcher used the descriptive analytical method and the Statistical Program for Data Analysis. Results of the study indicated that university students who were chosen for this study, we found to be facing a real problem, when writing English tenses. This problem affected their performance. The study showed also that the greatest numbers of errors were found to be due to omission of verbs and verbs to be. Moreover, the results revealed that the reason behind the student’s errors was a linguistic cause related to the interference of first language, and the target language. The researcher recommended that further research should be carried out, in the areas of tenses, as the data of the analysis indicated that. Thu, 01 Jun 2017 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/575 2017-06-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/574 Causes of Silicification, Tension Joints and Different Degrees and Directions of Dips of Nubian Sandstones Outcrops in Khartoum State Omer Omer Elbadri; Elgizouli Ahmed Hamid Nubian Sandstone outcrops north of Khartoum State are arenaceous with fossils and horizontal, while in central and south are ferruginous, argillaceous, dipping in different directions, with tension joints and no fossils. Field work targeted all outcrops in the study area; methods include description, measurements, and petrographic analysis. The present work referred silicification and Petrified wood formed as a result of hydrothermal alteration by silica derived from adjacent basement complex.Different directions of dips and tension joints is attributed to intrusion of Late Tertiary basaltic rocks in central area. Thu, 01 Jun 2017 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/574 2017-06-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/573 Assessment of Plasma Troponin I, Total Creatine Kinase and Creatine Kinase -MB as Biomarkers for Acute Coronary Syndrome in El-Obied City Akram Hamed Awad Alla Elsukar1; Waleed Hajmusa Elttahir2; Marwa Ahmed Elzain Abdalla3 Acute coronary syndrome is one of the world’s major killers and has a high morbidity and mortality rates. The aim of this study to assess the role of different markers used in the diagnosis of acute coronary syndrome. Descriptive case - control study conducted during the period from October 2015 to August 2016 to determine the plasma levels of total creatine kinase (CK), creatine kinase – MB (CK-MB) and troponin I as diagnostic markers for acute coronary syndrome. Statistical package for social science (SPSS version 17) computer software was used for data analysis. The result of this study showed significant high level of CK and CK-MB of the test group when compared with control group and significant elevated means of plasma levels of total CK and CK-MB of myocardial infarction patients when compared with unstable angina within test group. The result of this study also revealed that; the plasma troponin I is positive in myocardial infarction when compared with unstable angina in test group. Conclusion: Qualitative assessment of plasma level of cardiac troponin and measuring of the plasma activity of total CK and CK-MB are helpful markers for diagnosis of patients with acute coronary syndrome. Thu, 01 Jun 2017 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/573 2017-06-01T00:00:00Z