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Introduction: Exposure to flour dust is an important risk factor in occurrence of allergic airway disorders among mill workers. The purpose of this study was to determine the prevalence of respiratory symptoms and its relation with exposure to respirable dust. Materials and Methods: In this study, all of 35 workers who worked in the flour producing section of three factories were chosen as case group and 20 unexposed people were selected as the control group. Exposure to total and respirable dust were measured with standard methods. Spirometry was used for determining lung function disorders and the America Lung Society Questionnaire was used for assessment of prevalence of respiratory symptoms. The results were analyzed by t-test, correlation and linear regression. Results: The average total and respirable dust exposure in the exposed group was 8.06 and 5.09 mg/m3 and was higher than the threshold limit value recommended by American Conference of Governmental Industrial Hygienists(ACGIH). 52% of workers had sputum in the morning and during waking up, 44% felt tightness of breath or pressure in the chest, 55% felt short of breath while walking fast and work and in 52% cough during work was experienced. There was a significant and negative correlation between total and respirable dust with Forced Vital Capacity(FVC), Forced Vital Capacity Percent(%FVC) and Forced Expiratory Volume in one second(FEV1). Conclusion: The results of this study indicate that exposure to respirable dust was more than 10 times higher than the threshold limit and caused a high prevalence of respiratory symptoms and lung function disorders among mills workers.

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Introduction: Research results show that unmanaged use of virtual networks is the cause of differences between couples. Accordingly, the present study aimed to determine the mediating role of attitudes toward betrayal and marital conflicts in the relationship between the use of virtual social networks and emotional divorce in married teachers in Mashhad.
Methods: The research method was descriptive-correlational and the society included married teachers in seven areas of education in Mashhad city in the academic year of 2017-2018. 375 teachers were selected by quota sampling method and completed questionnaires on social networks, emotional divorce, attitudes toward betrayal and marital conflicts. Data were analyzed using path analysis using Maximum Field Definition (ML). The structural equation modeling was used to analyze data using AMOS software version 25.
Results: Based on the findings, the mediating role of attitude toward betrayal was not significant for predicting emotional divorce based on the use of virtual social networks (β = 0.06).The role of conflicting intermediaries is significant for predicting emotional divorce based on the use of virtual social networks. Accordingly, the role of the mediating meanings of marital conflicts along with the non-perceptible role of attitudes toward betrayal, based on the use of virtual social networks, predicts a total of 20% of the variance of emotional divorce. If the direct role of using virtual social networks in predicting emotional divorce along with the role of intermediate variables is considered, 66% of the variance of emotional divorce is predictable. Fit indicators showed the optimal fitness of the model with the collected data. (P <0.05)
Conclusion: The results of this study showed that increasing the use of virtual networks with increasing conflicts increases the incidence of emotional divorce in couples.