مهسا محمدپور

The definitive role of mast cells and angiogenesis in the pathogenesis of Peripheral giant cell granuloma (PGCG) of the oral cavity is not yet fully understood. The aim of this study was to evaluate the mast cell counts (MCs) and microvascular density (MVD) and investigating the relationship between them and PGCG of the oral cavity.

In this descriptive-analytic study, 50 samples were selected from the archieve of oral pathology department in dental school at Zahedan University of Medical Sciences using census. The samples included 40 PGCG and 10 normal oral tissues that were stained by immunohistochemistry (CD31 antibody) and toluidine blue to identify MVD and MCs, respectively. Data were analyzed using T-test, Pearson correlation test in SPSS V.21.

The mean number of mast cells was 38.51±36.43 in PGCG and 14±3.21 in normal tissues indicating significant difference between the two groups (P= 0.041). Findings showed a significant difference in MVD between PGCG group (93.34±64.43) and normal tissues (41.9±16.7) (P=0.017). MVD and MCs below the epithelium were found to be higher compared with those in deeper area of connective tissue. No correlation was found between the MCs and MVD (r=0.003, P=0.982).

In the present study, mast cells count and microvascular density were higher in PGCG than normal tissue which could explain the role of mast cells and the subsequent process of angiogenesis in the pathogenesis of this reactive lesion of the oral cavity, but no correlation was found between the mast cells count and microvascular density.

Standards and ethics are very important for any profession that intends to develop its professional talents and develop the overall efficiency of the business. The information age and the current business world require the accounting profession to maintain transparency and accurate financial reporting. Therefore, accountants who are responsible for preparing accurate, concise and timely financial statements must adhere to the highest standards of ethical responsibility. However, ethical behavior among accounting professionals is not always guaranteed. The present study examines whether there is a strong correlation between the accounting profession and the role of the accountant. This study also examines the role of professional accounting institutions in promoting and promoting ethics in the global accounting profession. The results show that the role of the accountant depends on the ethics of the accounting profession.

Organizational culture is an important issue of human resource management that affects the success and sustainability of a company. In organizational environments, culture describes what is unique about an organization, as expressed by the shared beliefs and values created by the founders, and communicates in a variety of ways. Be. It shapes employees' perceptions and behaviors, as well as the principles that apply to members of an organization. Job satisfaction refers to an employee's feelings about their job and is often studied in relation to organizational culture and other variables such as job commitment, performance, and organizational commitment. Organizational commitment refers to whether an employee wants to continue working in an organization or leaves it. Employees tend to be attracted to organizations that have a culture that values their work and focuses on organizational well-being. There is a positive relationship between organizational culture, job satisfaction and organizational commitment of employees.

To investigate the behavior of the superalloy deformation behavior of GTD 111 casting, the hot-pressure tests were carried out at a temperature range of 950 -1100 ° C and strain rates of 1- 0.001 s-1. All of the flow curves showed a relatively linear tension increase to one peak point and then its descent to a strain of 0.5, and the region of steady state deformation with constant stress was not observed. This process was attributed to the control of dislocations by the dendritic structure and their amplification at peak point. Microstructural investigations showed that the hot work would break the structure of the dendritic network and create separate cells. An increase in the temperature of the hot work, resulted an increase in the decomposition of the structure and the achievement of larger cells coused by dissolution of broken dendritic particles. Also, with the increase in the rate of deformation at a given temperature, the decomposition rate of the dendritic network decreased and its elongation increased in the direction of the deformation. Using the fundamental constants of material, n, b and a were determined at the peak point. Also, with the help of the fundamental relationship of sinuses hyperbolic, the amount of activation energy at the peak and the strain of 0.4 samples was 947 kJ / mol and 890 kJ / mol, respectively. These results showed that the deformation activation energy decreases with increasing strain and breaking the dendritic structure into distinct cells.