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Background & aim:  Flies are important in the region in terms of mechanical transmission of pathogens, sciatica and forensic entomological research. Identification of species in different regions is the first and most important way to control vector-borne diseases in the region. Therefore, the aim of the present study was to determine the diversity of species and relative abundance of flies of medical importance in Golestan province during 2018-2019.
 
Methods: In the present descriptive study, the samples included medically important flies, which were sampled in both urban and rural areas, including eight stations in Ramyan city in 2018. Trapping was done monthly, on sunny days and on the hottest day of the month. Entomological nets and cone traps were used to catch adult flies. Species identification was performed based on valid keys. The collected data were analyzed using Microsoft Excel software.
 
Results: In the present study, 10 species of Musca domestica (housefly) (53.75), Muscina stabulans (7.26), Lucilia ceasar (14.39), Lucilia sericata (7.91), Calliphora  vicina (8.95), Sarcophaga africa (1.55), Sarcophaga aegyptica (0.51), Calliphora vomitoria (3.48), Sarcophaga argyrostoma (0.75), Muscina levida (0.18) in three family including Muscovidae, Sarcophagidae and Acrostida were captured. The most abundance of flies were observed in garbage collection sites and animal places. Musina levida species was reported for the first time from northern Iran in this study. Based on the results of temperature and humidity fluctuations, it was established that the higher temperature and decreasing humidity, the more abundance of flies’ population were obsereved.
 
Conclusion: Due to the high abundance of flies in waste collection sites and animal sites, rapid transfer of non-residential areas and their sanitary burial is necessary to reduce the population of flies. It is necessary to move animals out of residential areas and provide health advice to people and health centers on diseases transmitted by flies in the warmer months of the year.
 
 

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Background & aim: Today, the production of effluents containing medicinal compounds, including tetracyclines, is one of the major threats to the environment and endanger human health. Accordingly, the need for an efficient system to remove these compounds from aquatic environments is felt. Therefore, the aim of this study was to optimize and model the removal of tetracycline antibiotics using TiO2 / N / S nanocatalyst in the presence of visible light in aqueous solutions.
 
 

Methods: In this experimental study conducted in 2019, nanocatalyst was synthesized by sol-gel method and then its characteristics were analyzed using SEM, XRD, EDS and BET analyzes. Secondly, by changing the reaction conditions such as changing the synthesized photocatalyst dose (0.1-2) g/l, antibiotic concentration (1-50) mg/l, reaction time (2-90) minutes and solution pH (2-10) and by visible light irradiation to remove tetracycline from synthetic effluent and the effect of these variables on process performance by response surface method and CCD method and determination of optimal conditions, investigation of reaction kinetics, tetracycline mineralization and photocatalyst performance in real wastewater treatment Was evaluated. Tetracycline was determined by reverse phase high performance liquid chromatography (HPLC). The collected data were analyzed using analysis of variance.

 
Results: The software has proposed a complete quadratic model as the best model, based on ANOVA analysis of variance. The maximum removal efficiency of tetracycline with this process in optimal conditions with a pH of 6 and a time of 56 minutes and a concentration of tetracycline of 13 mg/l was the catalyst value of 1.2 g/l was 77%. The mineralization efficiency of tetracycline antibiotics under optimal conditions was 47% and the kinetic study presented that the data followed the quasi-first-order model well and eliminate the tetracycline process in the wastewater of Imam Sajjad Hospital of Yasuj by 72%.
 
Conclusion: The results indicated that the efficiency of TiO₂/N/S photocatalytic process exposed to visible light radiation in the removal of tetracycline due to lack of by-products as well as mineral end products (carbon dioxide and water) as a desirable process.
 
 

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Background & aim: Air pollution is one of the most important health risk factors in the world and one of the major causes of death and disability in the world. According to the report of the World Health Organization in 2012, about 3.7 million people in the world die due to air pollution. The purpose of the present study was to determine and investigate the health effects of air pollution in Yasuj city in 2015 using the AirQ+ model.

Methods: In the present descriptive-analytical study conducted in 2019, the hourly concentrations of particulate pollutants with a diameter of less than 2.5 microns, ozone and nitrogen dioxide in the monitoring station of Yasuj, Iran, from the environmental organization and related pressure and temperature information was obtained from the meteorological organization of the province in 2015. Validation of air quality data was done according to APHEKOM and WHO methodology, and the average specific to each pollutant was calculated and the final data file was entered into the model after processing. Finally, the city-specific annual population, the population at risk and the base incidence for each health outcome were prepared and entered into the model. At the end, the results were displayed in the form of mortality tables by the model. Collected data were analyzed using Kolmogorov Smirnov, Post hoc and Kruskal Wallis statistical tests.

Results: The average concentration of pollutants with a diameter of less than 2.5 microns, nitrogen dioxide and ozone were 21.68±13.91, 25.41±26.88, 25.41±6.92 and 25.69±6.92 micrograms/square meter, respectively. It was micrograms per square meter. The value of SOM weight 5 was also 17.83. Regarding the long-term effects in 2015, the attributed component and the number of attributed cases of natural deaths caused by nitrogen dioxide from pollutants with a diameter of less than 2.5 microns were less, which accounted for 6.01 and 6.79% of deaths, respectively. The total number of deaths caused by pollutants with a diameter of less than 2.5 microns and nitrogen dioxide were 23 and 20, respectively. Ozone had no effect on respiratory mortality (zero cases). In the case of natural mortality, the highest and lowest attributed components were observed in pollutants with a diameter of less than 2.5 microns and ozone, respectively.

Conclusion: Contrary to the insignificant effect of ozone pollutant and the non-attribution of deaths to this pollutant, for other pollutants such as pollutants with a diameter of less than 2.5 microns and nitrogen dioxide, effects on the number of deaths were observed, and these effects may impose direct and indirect costs on the city.

 

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Background & aim: Bacillus cereus and Enterococcus faecalis are pathogenic bacteria that are abundant in nature and can produce toxins that cause food poisoning in consumers. The aim of the present study was to investigate the contamination of Bacillus cereus, Enterococcus faecalis, and coliforms in spices sold in Shahrekord market.

Methods: In this study, first, 100 samples of spices including turmeric, cinnamon, spices, black pepper and red pepper (20 samples each) were randomly sampled and transferred to the food hygiene laboratory. To detect Bacillus cereus and Enterococcus faecalis, linear culture method, determination of the frequency of virulence genes by Multiplex PCR method, evaluation of antibiotic resistance by Disk-Diffusion method and coliform enumeration by standard method were used.

Result: The results showed that 45 samples (45%) and 12 samples (12%) were contaminated with Bacillus cereus and Enterococcus faecalis, respectively. In Bacillus cereus, the frequency of virulence genes CytK, Ces and hblC was 25%, 11% and 4%, respectively. The results obtained from the coliform enumeration showed that the highest amount of coliform was counted in turmeric and the lowest amount of coliform contamination was counted in cinnamon. The results of the antibiogram showed that the highest resistance of Bacillus cereus was related to penicillin and ampicillin and the highest resistance of Enterococcus faecalis was related to erythromycin.

Conclusion: According to the results obtained from the present study, the presence of Bacillus cereus and Enterococcus faecalis in spices sold in Shahrekord city can be a warning for consumers and endanger public health.