Comparative study of the electrochemical, biomedical, and thermal properties of natural and synthetics nanomaterials

In this research, natural nanomaterials including cellulose nanocrystal (CNC), nanofiber cellulose (NFC), and synthetic nanoparticles such as carbon nanofiber (CNF) and carbon nanotube (CNT) with different structures, sizes, and surface areas were produced and analyzed. The most significant contribution of this study is to evaluate and compare these nanomaterials based on the effects of their structures and morphologies on their electrochemical, biomedical, and thermal properties. Based on the obtained results, the natural nanomaterials with low dimension and surface area have zero cytotoxicity effects on the living cells at 12.5 and 3.125 μg/ml concentrations of NFC and CNC, respectively. Meanwhile, synthetic nanomaterials with the high surface area around 15.3–21.1 m2 /g and significant thermal stability (480 °C–600 °C) enhance the output of electrode by creating a higher surface area and decreasing the current flow resistance

Detection of Quinolone resistance genes in the Salmonella enteritidis strains isolated from food samples by Multiplex-PCR method

Introduction: Antibiotic resistance in Salmonella is considered in the past two decades due to resistance associated with the consumption of drugs as additives in animal food chain, indiscriminate use of arbitrary know the people and the administration. Mortality in epidemics caused by strains resistant to antibiotics has increased. The aim of this study was to investigate the quinolone resistance genes in Salmonella enteritidis isolated from food.Materials and Methods: The study included 60 isolates of S. Enteritidis isolates from food-microbiological research laboratory of microbial collection Pasargadae was taken. Antibiotic resistance patterns of Salmonella isolates to disk antibiotics (amoxicillin, nitrofurantoin, nalidixic acid, ciprofloxacin, cephalothin, norfloxacin and ofloxacin) with disk diffusion testing by Kirby - Bauer was based on CLSI. The genes qnrB, qnrS and qnrA simultaneously with Multiplex PCR method was investigated.Results: The results show that all 60 isolates tested (100) were sensitive to cephalothin complete and while most resistance to nitrofurantoin among the isolates (50 isolates, 83. 3) and then nalidixic acid ( 44 isolates, 73.3) is. A total of 8 isolates of Salmonella enteritidis was identified 5 qnr B gene (62.5) and 3 isolates qnr S gene (37.5), respectively.Conclusion: the qnrS and qnrB resistance genes are play an important role in the creation and transmission of antibiotic resistance. Screening quinolone resistance gene as a marker and mark the acquisition and development of antibiotic resistance can be used as an important strategy in the fight against antibiotic resistance in bacteria

Factors Affecting Traffic Accidents in Kermanshah City Taxi Drivers - Focusing on the Role of Fatigue and Sleep Quality

Background and Objective: Traffic accidents are one of the most important challenges metropolises face, which impose significant costs on them every year. This study was conducted to determine the prevalence of accidents and the factors affecting them among city taxi drivers in Kermanshah, Iran. Materials and Methods: In this descriptive-analytical cross-sectional study, 320 male urban taxi drivers in Kermanshah were investigated in 2018. The required data were collected using a multi-part questionnaire including demographic and occupational characteristics, a visual analog scale for fatigue, and the Pittsburgh Sleep Quality Index. To analyze the data, non-parametric statistical tests and logistic regression models were employed by using SPSS software (version 25). Results: The frequency of accidents among urban taxi drivers of Kermanshah was 38.3% (n=123). Significant differences were observed in the variables of work experience, fatigue level, and smoking among drivers with and without accidents (P<0.05). Based on logistic regression, smoking (odds ratio: 2.68 and 95% confidence interval: 1.66-4.33) and one unit increase in the fatigue level (odds ratio: 1.01 and 95% confidence interval: 1.00-0.1-02) were significantly associated with an increased chance of the accident in the drivers. Conclusion: Due to the relatively high prevalence of accidents among urban taxi drivers, it is necessary to design and prioritize comprehensive programs to identify and control the factors affecting accidents in this group of drivers

Indicator for success of obesity reduction programs in adolescents: Body composition or body mass index? evaluating a school-based health promotion project after 12 weeks of intervention

Background: Obesity in adolescence is the strongest risk factor for obesity in adulthood. This study aimed to evaluate the effects of a comprehensive lifestyle intervention on different anthropometric indices in 12–16-year-old boy adolescents after 12 Weeks of Intervention. Methods: A total of 96 male adolescents from two schools participated in this study. The schools were randomly assigned to intervention (53 students) and control school (43 students). Height and weight of students were measured and their body mass index (BMI) was calculated. Body fat percent (BF) and body muscle percent (BM) was assessed using a bioimpedance analyzer considering the age, gender, and height of students at baseline and after intervention. The obesity reduction intervention was implemented in the intervention school based on the Ottawa charter for health promotion. Results: Twelve weeks of intervention decreased BF percent in the intervention group in comparison with the control group (decreased by 1.81% in the intervention group and increased by 0.39% in the control group, P < 0.01). However, weight, BMI, and BM did not change significantly. Conclusions: The result of this study showed that a comprehensive lifestyle intervention decreased the body fat percent in obese adolescents, although these changes was not reflected in the BMI. It is possible that BMI is not a good indicator in assessment of the success of obesity management intervention