Showing 5 results for Asaadi
Volume 2, Issue 4 (10-2016)
Abstract
Background: Salmonella typhimurium is one of the most important species of Salmonella that is intracellular parasite and attacks host mucus membrane. These bacteria can cause gastroenteritis, and their main transmission route is water, poultry, meat, egg, and raw food. The aim of this study was to detect three virulence genes associated with S. typhimurium named invA, STM4497, and fliC183 genes by Multiplex PCR method.
Materials and Methods: 183 samples of poultry were collected from food products in Zanjan (Iran) and cultured in BPW (Buffered Peptone Water) for 18 hr and at 37°C, and in RVS broth (Rappaport Vassiliadis Soya) for 6 hr at 41.5°C. After amplification of genomic DNA by Multiplex PCR method, occurrence of pathogen contamination was checked and compared with standard strain.
Results: From the total of 183 collected samples, 52(28.4%) samples were positive for S. typhimurium. The frequency of STM4497, fliC183, and invA genes were 49 (27%), 3 (2%), and 53 (29%), respectively.
Conclusion: Simultaneous detection of invA, STM4497, and fliC183 genes were recognized as a key for detection of S. typhimurium by Multiplex PCR method.
Volume 3, Issue 3 (9-2015)
Abstract
Germination is a critical stage in the life cycle of plants and often controls population dynamics, with major practical implications. Salsola arbusculiformis is one of the most important plants used to prevent soil erosion and a good fodder resource for sheep and goat in the rangelands of Iran. However, the species seems to have low seed germination, so the purpose of this study was to investigate the effects of different treatments to improve its seed germination. Three concentrations of gibberellic acid (100, 500 and 1000 ppm), mechanical scarification with sandpaper, concentrated sulphuric acid (H2SO4 (98%)), potassium nitrate (KNO3 (0.2%)), thiourea one Molar, four prechilling periods (10, 20, 30 and 150 days at 2 °C) were used as study treatments and distilled water as control. The results showed that there were significant differences (p<0.05) among and within the treatments in their effects on seed germination. The effective treatments to stimulate seed germination were prechilling for 150 and 30 days; sulphuric acid and sandpaper scarification. Prechilling for 150 and 30 days increased germination by 88.4% and 85.65%, respectively, while sulphuric acid and sandpaper scarification both increased germination by 76.1% compared to the control. The results also showed that gibberellic acid, potassium nitrate and thiourea did not promote seed germination. It was inferred that the most effective treatments among the methods used for breaking seed dormancy of Salsola arbusculiformis were prechilling for 150 days and mechanical scarification by hand with sandpaper.
Volume 10, Issue 2 (Spring 2022)
Abstract
Aims Floristic surveys are important methods to find the new herb species and protect natural ecosystems. Since there is no report about floristic survey in Akhardaghe region, the aims of this research were to determine floristic list, life forms, chorological analysis, protected status and endemic of plants species in the Akhardaghe watershed in Bojnourd.
Materials & Methods The plant specimens of the study region were collected during active growth periods in 2016 to 2020. Determining the life form was done by Raunchier category, Endemic, rare and endangered species of Iran was determined based on Red data book of Iran and chorology of species is according to vegetative regions classified by Zohary and Takhtajan.
Findings In the floristic survey, a total number of 346 plant species were belong to 234 genera and 63 families. The most important families were Asteraceae with 54 species and Lamiaceae with 36 species. In terms of life forms, the highest percentage for both hemicritophytes and therophytes (61%) were found.
Based on chorology, there were a high ratio of Irano-Turanian elements (55%). In addition, 37 endemic species were determined. According to the IUCN, 53 threatened plant species in this area.
Conclusion
The finding of the current floristic research revealed that the vascular plant flora in the area is rich in species and contains numerous endemic, rare and medicinal plants species. However, most of the plants species are severely threatened by human overutilization. Therefore, conservation and protection management policies have to be applied to the Akhardaghe watershed vegetation.
Volume 18, Issue 8 (12-2018)
Abstract
In this paper, the separation black powder from air flow experimentally have been studied by spiral-channels dust separator and the efficiency and pressure drop of spiral-channels dust separator has been investigated by CFD simulations in different operating conditions. Powder particles have been tested from a sample of powders of Saveh Strengthening Station, whose average particle size has been determined by DLS and SEM images processing, 0.327 micrometers. CFD simulation of spiral-channels dust separator has been done with FLUENT software. The RNG k-ε turbulent model as an optimal turbulence model has been used. The difference between the experimental and the simulation results was revealed around 16% and 7.15% for efficiency and pressure drop parameters respectively. To illustrating the effect of operating condition, the various flow rate and solids mass fraction were investigated and results showed that maximum efficiency is the highest input volumetric flow rate. Also, the results showed that this system has the efficiency of more than 80% for separating Black Powder particles and with increasing 40% of the volumetric flow rate, the separation efficiency increased up to 10%. If, by increasing the mass fraction of solids by 5 times, the efficiency increased only by 3%. The pressure drop of the separator increased up to about 50% with increasing the volumetric flow rate from 80 to 140 m3/hr.
Volume 26, Issue 2 (3-2024)
Abstract
The poultry industry is one of the most important agricultural subsectors, significantly contributing to protein supply and holding a unique position in terms of production and employment. To expand and boost profitability in this industry, it is important to analyze the economic factors of production, so that the factors influencing the rise in productivity of broiler production units may properly be recognized. As a result, the effective factors on the productivity of the Arian broiler sector in Iran's Kurdistan Province were investigated and prioritized in the current study. In order to evaluate the productivity of the industry, four main factors including human capital, economic, technical, and environmental variables were evaluated. The DEMATEL-ANP integrated approach was then used to determine the relative weights of the factors. The results revealed that the human capital component had the highest impact and the economic component was identified as the most influential factor among the other factors. Furthermore, the economic indicator had the highest priority, with a weight of 0.17. Of the 29 research components (sub-criteria), the "broiler farmer experience", with a weight of 0.042, exerted the greatest impact on the productivity of the province's broiler sector. The "feed cost", "day-old chicks cost", and "health care cost" ranked the second to fourth, respectively. According to the findings, more attention should be devoted to the production chain, such as input production and poultry vaccinations, in order to accomplish and also enhance productivity in the broiler industry.
