فهرست مطالب mohammad ansarizadeh

The current study examines general dental students’ views about the ethics level in education, research, and provision of dental services. This descriptive cross-sectional study was performed on all general dental students at Yasuj University of Medical Sciences selected in the census. The researcher-made questionnaire was prepared online with PorsLine. In this questionnaire, examples of observing or not observing ethics in education, research, and provision of dental services by faculty members were presented to the dental students. Finally, all collected data were analyzed by SPSS software version 26. 47 students participated in the current study. The participant’s mean age was 25.95 with a standard deviation of 3.5. Results of the study showed that the mean and standard deviation of non-observance of ethics in education, the provision of dental services, and research were 3.05±0.9, 2.37±1.03, and 3.04±1.15, respectively. General dental students reported that the level of ethics in education, research, and provision of dental services by faculty members was unfavorable, so it is recommended that medical education courses related to ethics should be held for faculty members.

Discharging antibiotics into the environment could cause great concern for scientists. In the present study, tetracycline (TC) antibiotic was photodegraded with titanium dioxide (TiO2) and zinc oxide (ZnO) fixed on the polyurethane (PU) in the presence of ultraviolet (UV) irradiation and optimized through response surface methodology (RSM).
This experimental study was conducted on the most effective variables (pH, contact time, TC concentration, and catalyst doses) for experimental design. The experiments of degradation with the process of PU/UV/nanocatalyst composite were conducted with a reactor glass vessel (1000 mL) as batch mode.
The results showed that the quadratic model can be used for the interpretation of experiments. The results of the model represented that all parameters had a significant effect on the tetracycline removal, and the degradation of antibiotics was obtained at the optimum condition that was 95% for ZnO/UV/PU and 97% for TiO2/UV/PU. The main radical for the degradation of TC was hydroxyl ions based on the scavenger study and the first-order kinetic model was best fitted with data. The highest removal efficiency was obtained at pH of 5.2, catalyst dose of 2.64g/m2, TC concentration of 25.21, reaction time of 82 min using ZnO/UV/PU and pH of 5.8, catalyst dose of 2.9 g/m2, TC concentration of 25.12, and reaction time of 90 min using TiO2/UV/PU.
It could be concluded that the process of nanocatalyst fixed on polyurethane can significantly eliminate the antibiotic in the presence of ultraviolet irradiation from the effluent of the wastewater treatment plant.

Iran is among the top ten disaster-prone countries in the world because of its size, geographical location, and climatic diversity. Practically, the healthcare sector is an active part in disaster management and an integral part of the national health plan. This study aimed to determine the preparedness of the personnel to cope with natural disasters in Valiasr Hospital of Mamasani, Iran.
This cross-sectional study was conducted in Valiasr Hospital, which has 100 beds.  Data were collected using a 210-item researcher-made checklist. For each target, six domains of equipment, human resources, structure, physical space, protocol, and performance charts were considered. Face and content validities were used to confirm the validity and reliability of the questionnaire.
The results of this study showed that the support unit scored the highest (69.45 %), followed by the command and management (66.16%) and education units (66%), respectively. Security units (51%), transportation (41.47%), and evacuation (40%) received the lowest score, respectively.
The findings showed that the hospital under the study was in moderate level in preparedness for disaster. Improving the preparedness of hospitals for disasters will be possible with proper management of available resources and the use of update technologies.

Among chemical dyes, Azo dyes, as environmental synthetic pollutants, are most commonly used in a bunch of different colors in different industries, especially in textile industry to a large extent. Due to some limitation and difficulties to remove these pollutants from the environment, the biological filtering method, as the economically and optimal methods, are preferred. Using the Taguchi method and evaluation of such factors in the environment as temperature pH, color density and concentration of salt, we studied the optimal condition of Halomunas PTCC1132 bacteria decolorization in order to compare it with the Aryapress dye removal from aquatic environment. Therefore, 16 experiments were designed according to Array Table in 4 factors and 4 levels. The results were then analyzed using a computer the program named Qualitek-4. The results showed that this salt, loving bacterium Halomonas strain PTCC1714, has the ability of bleaching in a wide range of salts till 20%, pH (5-9) and dye tolerance up to 5 gr/lit (500 ppm), and has the highest rate of decolorization in 100 ppm. According to the  results with an  optimal growth condition- the temperature of 40c, pH of 7.5, and the salt concentration of 10% up to 93% - the strain was capable of removing the Azo dye Aryapress color with the concentration of 100 ppm which is a considerable amount and can be used in biological treatment of industrial textile sewage.

Azo dyes have different applications in industry. However they could impose carcinogenic and mutagenic influence on different organisms. Several chemical and ph ysical methods have been proposed in removing of these dyestuffs. Alternatively, biological treatment is recognized as economical and environmentally friendly method for decolorization of dyestuff wastewaters. In the current research the capacity of the removal of Remazol Black-B and Remazol Red-B by Streptomyces hygroscopicus PTCC1132 in static condition was investigated. An OA layout was constructed with four factors (temperature, pH, salt concentration and dye concentration) at four levels for the experimental design. The design and analysis of Taguchi experiments was performed by Qualitek-4 software. We showed that the Remazol Black-B decolorization can be significantly improved by Optimization of the factors involved in Remazol Black-B decolorization by S. hygroscopicus. The optimal conditions were pH 9, temperature 33oC, salt concentration 1 % and dye concentration 5000 ppm. Under optimum conditions. Thus, this straine, under the achived effective condition az a result of exprements analysis i.e, temperature 33 degree of centigriade, pH=8, and salt concentration =1% up to 100 percent of azo dyes(RR-B) with the density of(10000 ppm)will be removed aqueous medium. employing this type of bactria in biological treatment of wastwater with industrial dyes can be of great help in treatment and re-use wastewater.

Exposure to air pollutants can cause many problems, including the health effects in humans and animals. The aim of this study was to assay the air quality in the Shiraz city during 2011-2013.
In this descriptive-analytical study, the air pollutant data during the study period were taken from Air Quality Co. for two main stations i.e. Darvazeh Kazeroun and Imam Hossein and then were analysed to determine air quality index.
The maximum (0.018 ppm) and minimum (0.015 ppm) annual concentration of SO2 were determined in 2011 and 2013, respectively. The maximum NO2 concentration was measured in summer 2011 with a value of 0.025 ppm. Regarding ozone, the highest average concentration was measured in the summer season of 2013 with the concentration of 0.068 ppm. In terms of air quality, the worst situation was experienced in 2011, which about 31 percent of the days have been marked as unhealthy, but during the last years of the study, the air quality get better.
In general, the results of the study showed that SO2 concentration has been decreased during recent years due to strengthen of air pollution regulation but NO2 concentration was increased because the number of gas fuel automobile was also increased. With regard to air quality, it has an improving trend during the study period.