Background: Ameloblastoma an odontogenic tumor of ectodermal origin has been reported to arise, on rare occasions, in a primordial or dentigerous cyst of a young person. Numerous authors have suggested differing nomenclatures for these ameloblastomas and have sought to describe and classify the clinical and histopathologic features. These tumors have been characterized as a distinct variant exhibiting less aggressive behavior and a lower rate of recurrence than conventional ameloblastoma.Aims: This study was designed to look at the Human papilloma virus as a caurse for Ameloblastoma.Materials and Methods: Samples of Ameloblastoma tumors were traced from the filing system in path lab Beheshti Dental School. Using PCR technique a search was carried out to dated HPV in DNA of samples.Results: There was a clear relationship between the rates of HPV in Ameloblastoma cases.Conclusion: HPV could be a preparing factor for Ameloblastoma.

Background: Transformation and differentiation of activated B-cell to plasmacells and also memory cells depend on signaling from B-cell receptors. The signals from antigen and cytokine receptors on the surface of B cells lead to induce the expression of specific transcription factors, which finally determine the fate of B cells.Methods: Peripheral blood mononuclear cells (PBMC) were isolated via ficoll gradient and then purified B cells were separated using magnetic-activated cell sorting (MACS). Pure B cells were cultured in Roswell Park Memorial Institute 1640 (RPMI1640) culture media at the presence of purified anti-Human CD40 antibody and anti-immunoglobulin M f (ab) ´2 or lipopolysaccharide (LPS) and anti-Human CD40 antibody that induced B-cells differentiation to plasmablasts which was assessed with 3 markers (CD38+, CD27+, IgM-) and analyzed via flow cytometry. Findings: In stimulation of B cells with purified anti-Human CD40 antibody and anti-IgM f (ab) ´2 or LPS through cross-linking B-cell receptor, the majority of B cells remained alive and differentiated to another lineage of B cells (plasmablast: CD38+, CD27+, IgM-). There was no significant statistical difference between expressions of plasmablast markers in two states of stimulation.Conclusion: B cells can be stimulated and differentiated to plasmablasts in vitro similar to in vivo condition. However, to achieve the best outcome in the differentiation of B cells, we should consider the nature of stimulator, the time of incubation, and the type of stimulators.

Introduction: Although risk assessment and accident prevention program have been widely used in industries such as steel industry, there are still numerous accidents in these industries. Hence, applying an accident analysis method can identify the root causes and casual factors of accidents and causal factors.Human Factors Analysis and Classification System can identify Human errors in the steel industry by using an analysis of past events. The aim of this study was to identify the Human errors in the steel industry using the HFACS methodology.Material and Method: In this study first, incident reports of industries with high risk, such as Ahvaz steel and pipe industries existing in the department of work and social security was gathered. Then, an analysis of accident was done based on HFACS model. This model has 4 levels and 18 categories which are 1 - unsafe acts of operators (that includes four subtypes) 2 - pre-conditions for unsafe acts (with seven categories) 3 - unsafe supervision (includes four categories) and 4 - the effect of association (with three categories).Result: In this study, 158 reports of accident in Ahvaz steel industry were analyzed by HFACS technique.This analysis showed that most of the Human errors were: in the first level was related to the skill-based errors, in the second to the physical environment, in the third level to the inadequate supervision and in the fourth level to the management of resources.Conclusion: Studying and analyzing of past events using the HFACS technique can identify the major and root causes of accidents and can be effective on prevent repetitions of such mishaps. Also, it can be used as a basis for developing strategies to prevent future events in steel industries.

The success of organizations is based on the personal specifications of personnel and how to change them into a longsterm performance. Human resource management factors as a source of competitive advantage for organizations affecting the efficiency of personnel has a great importance for organizations. The development of organizations can be extended by identifying these factors and improving them. There are a wide range of managerial Human factors that managers can focus on to achieve success and to improve the efficiency of personnel. This study aims at discussing Human resource management factors that can affect personnel efficiency of traffic police. Therefore, three hypothesis are given and, in the first step, after interviewing with some managers and experts, three Human resource management factors (performance appraisement of personnel, particippation of personnel in decision making processes, and training) are selected and then, through the use of a questionnaire, the effects of these factors on the efficiency of personnel are evaluated. Finally, the ranking order of these factors is determined. The results show that participation of personnel in decision making processes has the greatest priority and is followed by training and performance appraisement of personnel as the second and third priority levels, respectively.