Background and Aim The widespread application of crude oil and its products has caused numerous environmental pollutions. This study aimed to isolate, identify, and determine a bacterial strain’s potential of oil degradation isolated form oily sludge. 
Methods & Materials After preparing the oily sludge in the sterile containers and cultivating in Bushnell-Haas medium, 24 distinct bacterial colonies were obtained. After performing biochemical and molecular tests, the “Acinetobacter radioresistens strain KA2” with the highest growth rate and crude oil degradation was selected. Then, degradation of various concentrations of crude oil at different PHs (5, 6, 7, 8 and 9), bacterial adherence to hydrocarbons and emulsification index of the selected strain were measured. Total petroleum hydrocarbons were determined by gas chromatography. 
Ethical Considerations This study has been approved by the Research Ethics Committee of Islamic Azad University of Kermanshah Branch (code: 19250587962001 ).
Results The results indicated that the removal efficiency of crude oil at concentrations of 1, 2, 3, 4, and 5% were 65.24, 76.14, 53.81, 31.84, and 25.21%, respectively. Crude oil removal at pH values of 5, 6, 7, 8, and 9 was 42.4, 69.16, 65.24, 59.41 and 48.24%, respectively. Bacterial adherence to hydrocarbons and emulsification index of the isolated strain were calculated to be 13.69 and 59.14%. 
Conclusion The isolated bacterium is an efficient strain in treating the crude oil and petroleum compounds. 

Background and Aim: Physical complaints that have no clear cause are a process that is commonly seen in patients with Somatic Symptom Disorder (SSD). The increasing number of patients with this disorder and its related chronic symptoms including changes in quality of life and loss of individual efficiency has created social and psychological economic costs for these patients and their families.
Methods & Materials: This descriptive cross-sectional study conducted on 70 patients with SSD having digestive symptoms and chronic pain referred to the health centers in Semnan, Iran in winter 2018. They were selected using a convenience sampling method. The data collection tools were 15-item Patient Health Questionnaire Physical Symptoms (PHQ-15) and Rorschach test (Exner’s Comprehensive System). In order to analyze the collected data, multiple linear regression analysis, logistic regression analysis, and multivariate ANOVA were performed in SPSS v. 22 software.
Ethical Considerations: The present study was approved by the Research Ethics Committee of Semnan University of Medical Sciences (code: IR.SEMUMS.REC.1397.029).
Results: Perceived location indices including D and Dd scores in Rorschach test were able to significantly differentiate the SSD patients from controls (P<0.05). In the logistic regression model, 70% of participants were classified properly.
Conclusion: There is difference in projective responses between SSD patients and controls, and patients were less holistic. Anxiety and psychiatric symptoms were also higher in patients with SSD.

Background and Aim: The assessment of indoor air quality and detection of its microbial pollutants in classrooms is very important because of the presence of children sensitive to these pollutants. The aim of this study was to determine the concentration and characterization of dominant species of biological aerosols and their relationship with environmental factors in two selected primary schools in Arak, Iran.
Methods & Materials: This cross-sectional study was conducted at two primary schools in Arak, Iran in Fall 2018. Indoor air sampling was performed using single-stage Andersen microbial sampler (at flow rate of 28.3 liters/min) containing bacterial and fungal culture media. The effects of suspended Particulate Matter (PM) and environmental parameters (temperature and humidity) on the density of bioaerosols were evaluated.
Ethical Considerations: This study with an ethics code of IR.ARAKMU.REC.1397.76 was approved by the Research Ethics Committee at Arak University of Medical Sciences.
Results: The overall mean density of indoor bacteria and fungi was 448 cfu/m3 and 394 cfu/m3, while the mean density of outdoor bacteria and fungi was 210 cfu/m3 and 127 cfu/m3, respectively. There was a positive correlation between indoor density of airborne bacteria and suspected PM concentrations (PM 10 and PM 2.5), and between PM2.5 concentration and indoor fungal density (P<0.05). Penicillium (40%), Cladosporium (19%) and Aspergillus (16%) were dominant species of fungi, while Staphylococcus (42%), Micrococcus (28%), Bacillus (21%) were the dominant species of bacteria.
Conclusion: The age and type of building and the density of students in a classroom are the main factors in increasing the concentration of bioaerosols. 

Background and Aim: Parental acceptance is an important parameter in selecting the proper behavior management technique during pediatric dental treatment. The present study aimed to compare the effects of different informing methods on acceptance of parents about behavior management techniques used in pediatric dentistry.
Methods & Materials: This quasi-experimental study was conducted on one 162 parents of 3-7-year-old uncooperative children who were candidates for dental treatment. They were randomly divided into three groups. Their acceptance about six behavior management techniques including general anesthesia, voice control, hand-over-mouth, parental separation, active and passive physical restraint were assessed by a questionnaire. After determining the level of acceptance, the information about the techniques was presented through three ways include writing, verbal and visual methods. Finally, their acceptance of each technique and the reasons for non-acceptance were re-evaluated. Data were analyzed in SPSS v.23 software using ANOVA and t-test.
Ethical Considerations: This study obtained its ethical approval from the Research Ethics Committee of Arak University of Medical Sciences under code: IR.ARAKMU.REC.1398.102.
Results: The informing methods significantly increased the parents’ acceptance about behavior management techniques. According to the ANOVA results, the effect of visual presentation method in general anesthesia technique was significantly lower than that of other methods (P<0.05), while its effect in active physical restraint technique was significantly greater than that of other methods (P<0.05). There was no statistically significant difference between the effects of informing methods in other behavior management techniques.
Conclusion: Informing parents about pediatric behavior management techniques increase their acceptance. Informing by visual presentation is the most effective method for increasing their acceptance of physical restraint technique, while in their acceptance of general anesthesia technique other informing methods are more effective

Background and Aim Given the increasing number of patients with multiple sclerosis and the psychological complications that affect this group, the present study was conducted to compare the effectiveness of acceptance and commitment therapy and compassion-focused therapy for these patients
Methods & Materials This research was a quasi-experimental study with a pre-test-post-test design with a control group. A total of 45 patients with multiple sclerosis were selected from MS patients in Tehran Clinic, Tehran City, Iran, in 2020. They were randomly divided into three groups: the first group was under treatment based on acceptance and commitment therapy, the second group was assigned to the compassion-focused therapy, and the third group was the control. The participants completed the Connor and Davidson resilience questionnaire and the Pennsylvania concern questionnaire in the pretest and post-test stages. The first and second groups participated in eight sessions of acceptance and commitment therapy and ten sessions of compassion-focused therapy, respectively. The control group did not receive any intervention. The post-test was done at the end of the therapy sessions. Data were reported by analysis of covariance.
Ethical Considerations This research was approved by the Torbat Jam Branch, Islamic Azad University (Cod: IR.IAU.TJ.REC.1399.012).
Results The results of univariate analysis of covariance were obtained at the statistical level of P<0.05. In this regard, F=5.88 for resilience and F=42.60 for anxiety intensity were obtained, which indicated the greater effectiveness of acceptance and commitment treatment.
Conclusion Considering the effectiveness of both treatments, it is suggested that these treatments be given more attention to controlling patients’ psychological symptoms.

Introduction: Depression is an injury to the central nervous system that is caused by several factors that affect a large number of people around the world. Emotion regulation refers to the processes by which we influence what emotions we experience, when we experience them, and how we express them. The aim of this study was to investigate the role of emotion regulation in predicting depressive symptoms in students of Kermanshah University of Medical Sciences.
Methods: The present study is a descriptive correlational study. Participants were all students of the School of Nursing and Midwifery of Kermanshah University of Medical Sciences during 2020-2021. Three hundred and five participants were selected by available sampling method and randomly. Informed consent forms got from the participants, then they completed the Beck Depression Inventory - Second Edition (BDI-II) and the Cognitive Emotion Regulation Scale (CERQ-18). This research was reviewed in the ethics committee of Kermanshah University of Medical Sciences and approved with the ID IR.KUMS.REC.1400.623.
Results: In this study, the study population was 305 people, 9 of whom were excluded from statistical analysis due to incomplete answers. Total mean age was 50.08 ± 191.30 Of these, 198 (66.9%) were female and 98 (33.1%) were male. Self-blame strategies (β = 0.31, P≤0.001), positive reassessment (β = -0.26, P≤0.001), catastrophic (β = 0.26, P≤0.001), numerical importance (β = -0.12, P≤ 0.001) and positive refocus (β = -0.10, P≤0.001) in five steps predict 40% of the variance of depression. Inconsistent strategies such as self-blame and catastrophe directly and positive reassessment, insignificance and positive refocus inversely predict depression. Mahalanobis distance was used to investigate multivariate throw values. Statistical assumptions were tested by performing an initial regression analysis and evaluating the scatter plot of residues. After confirming the regression assumptions, the data were analyzed using Pearson correlation and stepwise regression. The findings of our study showed that there is a significant direct relationship between self-blame and catastrophic thinking as maladaptive strategies of cognitive emotion regulation with depression. Also in our study among adaptive emotion regulation strategies; Positive refocusing, positive reassessment, and a small number had a significant negative correlation with depression.
Conclusions: The results of our study showed that emotion regulation strategies play an important role in predicting the occurrence of depression. Therefore, it is necessary for health policy makers to strengthen adaptive emotion regulation strategies in designing and modifying interventions related to depression.

Introduction: Today, with the increase in population, the per capita production of waste materials and the subsequent threat and destruction of the environment is an increasing process, and waste management by the people of a society can play an essential role in reducing this problem. Therefore, the aim of this study was determine of predicting the waste management behaviors of households in Arak city in 2022.
Methods: This is a cross-sectional and analytical study that was carried out on 600 mothers of households in Arak city, who were selected by multi-stage sampling. The data collection tool was a valid and reliable researcher-made questionnaire that included demographic characteristics, knowledge, attitude and behavior of households in the field of waste management. Data were analyzed using SPSS software and t-test, chi-square and regression tests. This study was approved by the research ethics committee of Arak University of Medical Sciences (Code: IR.ARAKMU.REC.1401.040).
Results: The average age of the studied was 39±11 years and the number of family members was 3.6. In terms of type of housing, most of them lived in apartments (44%) and a smaller number lived in complexes (14%). 65 percent of the people had not received the training on the waste separation plan from the source, and among the effective training methods, the majority (38 percent) of the people had overestimated the effectiveness of the training through the Internet. The mean and standard deviation of knowledge was 66±19, attitude was 84±11 and performance was 73±18. The majority of the people studied had a good level of awareness and attitude. The regression analysis model showed that the greatest impact on the waste management behavior of the samples was the age of the people, their knowledge and attitude, which predicted a total of 33% of the waste management behavior.
Conclusions: Considering the favorable state of awareness and attitude of households in Arak city, it seems that for better waste management, other environmental factors should be emphasized, including sources of waste production at the source. Also, based on the prediction model, it is still important to inform and change the attitude of households in Arak city for better performance at younger ages.

Introduction: Dental unit water lines (DUWL) are a potential place for the accumulation of microorganisms and the formation of microbial biofilm, which exposes people to infection risk. This study aimed to investigation of the effectiveness of four commonly used substances and selection of most effective disinfectant in DUWLs disinfection.
Methods: This systematic review study was conducted based on PRISMA templates and the PubMed, Scopus and Web of Science databases with a specific search strategy were examined. In this systematic review study, the effectiveness of 4 disinfectants including: hydrogen peroxide, chlorhexidine, chlorine-dioxide, sodium hypochlorite on microbial biofilms in the DUWL was investigated. The study was conducted on July 10, 2021, and finally the data of all studies related to the subject of this systematic review were extracted. This study was approved by the Research Ethics Committee at Arak University of Medical Sciences (Code: IR.ARAKMU.REC.1399.347).
Results: All four disinfectants in sufficient concentration and time can be useful and effective. If the biofilm in DUWL is old and stabilized, it will affect the effectiveness of these materials and it will take longer to remove.
Conclusions: The use of materials in combination can cover all the microbial spectrum present in the biofilm of this area, and even fixed biofilms can be removed with extended and continuous use.