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Objective: Lymnaea palustris was previously found in Mazandaran province but there was not any report about its parasitologic aspects. This study was conducted to finding ecological and Parasitological aspects of snail in Mazandaran province, North of Iran. Materials and Methods: In this descriptive study, more than 181 locations, were checked, in 36 locations, colonies of the snail were found and 490 snails were collected. After diagnosis of snails as Lymanea palustris, in laboratory, they were crushed and their probable cercaria was checked out by a dissecting microscope. Data were analyzed and processed by ArcGIS 9.2 and Microsoft Office 2003 for descriptive analysis. Results: from 490 snails, 6 cases (1.22%) were infected with trematode larval stage. These cercariae were classified as echinostomaercaria. Optimum temperature for the snails was 15-19 degrees of celsius and optimum dissolved salt (TDS) was 200-400 ppm. Population of colonies were raised in autumn and winter but infected snails were seen in summer. Conclusion: This study could show the ecological pattern, distribution, and population dynamic of the snail. Also the existence of echinostomaercaria which is cercaria, generally belong to the Echinostoma sp, indicates veterinary and parasitological importance of local snails. It is probable these parasite, infect man also. More studies on definitive host and exact species of parasite are proposed.

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  The effect of adding Eleaagnus angustifolia  powder to quality characteristics of burger’s bread                an 5,10 and 15 percent levels was checked. Moisture and tissue’s characteristics (Hardness,Springiness,cohesivness) of treatment and blank breads was measured in first, third and fifth days. A test was done  Hedonic test, color measurement and, assessment of porosity and scattering of cavities in bread’s texture in first day.The results show increasing levels of Eleaagnus angustifolia  in breads lead to increase moisture, decrease volume , porosity and darker appearance than to control sample.The evaluation of textural preperties determined above the 10 perecent levels of Eleaagnus angustifolia  powder lead to increase textural Hardness of bread.on the other hand, adding Eleaagnus angustifolia’s powder , in all levels , lead to reduction in of intransitive powder for cutting beard. In terms of staling process , during the retention time , the sample which contains 10 perecent of Eleaagnus angustifolia’s powder staled slower than the other sample in the period of maintenance and  15 percent’s sample had most stale’speed. According to analysing the sensory evaluation, 10 percent sample had most acceptance. Generally according to the results treatment bread included 10 percent of eleaagnus angustifolia’s powder,will suggest for greater acceptance ,lower hardness, procrastination in staling and increas the amount of fiber.  

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In rocket systems, the re-entry speed to atmosphere is very high which leads to compression of air molecules and appearance of strong bow shock waves in the leading edge; consequently, this yields aerodynamic heating. Using ablating-dispensing materials on the leading edge surfaces, it is important to accurately determine heat flux on these moving boundaries. Measuring heat flux directly is very difficult or impossible in some situations. In the present study, the online Kalman filtering is used to determine heat flux accurately. Since the heat flux is estimated in online (non-iterative) fashion, the optimum location of temperature sensors can be effectively determined. In addition, the results of this study can be used to design heat flux sensors. In this paper, the optimum locations of three temperature sensors are calculated on the basis that the disturbances occur due to burning of sensors are reduced. More robust solutions are obtained for heat flux on the ablating surfaces.

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Milk, from its production to consumption, is exposed to a variety of microbial and chemical contaminants. Aflatoxin M1 (AFM1) is one of the most important contaminants in milk, which has always received attention due to its carcinogenic and destructive effects on the consumer. Accordingly, the rapid, sensitive, and cost-effective identification of AFM1 in milk is essential. In the present paper, an electrochemical aptasensor based on screen printed electrode (SPE) modified with magnetic nanoparticles (MNPs) and gold nanoparticles (AuNPs) was proposed to identify AFM1 in cow milk samples. SPE was activated by applying a potential within the range of -1.5 to +1 V versus the reference electrode at a scan rate of 200 mV/s for 5 continuous cycles in the 0.5 M sulfuric acid and 0.1 M potassium chloride solution. Changes of the electrode surface at different stages of preparation were assessed using cyclic voltammetry (CV) technique. Using CV in optimal conditions, it was found that the aptasensor presents a concentration range of 100-700 ng/l and a limit of detection (LOD) of 50 ng/l.  There was a linear relationship between changes of the current peak (∆I) and analyte concentration. This relationship follows the regression equation of ∆I=0.0209C+2.14 (R²=0.9897). Calculation of the relative standard deviation (RSD=3.2%) indicated the acceptable repeatability of the electrochemical aptasensor. The current peak was obtained to be 7.4% in the investigation of RSD reproducibility, indicating the good reproducibility of the electrochemical aptasensor. The obtained results showed that the aptasensor response after 8 days has only reduced by 7% compared to the first day, indicating the desirable stability of the aptasensor. The recovery percentage range for cow milk samples at concentrations of 100 and 200 ng/l was obtained to be 86.5 and 93%, respectively, showing the acceptable recovery percentage of the electrochemical aptasensor.

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Destructive organizational behaviors are emerging in various forms. Organizational bullying, with negative effects on work environments, directly and negatively affects people's health and imposes a high cost on the organization and results in a reduction in productivity. Therefore, the main objective of this research is to investigate the role of organizational bullying in occupational psychological characteristics (job engagement, job stress and job insecurity). This research is applied and descriptive - correlation method was used. The statistical population of queue staff was divided into five service organizations with 800 individual. The sample was determined according to the Morgan table and stage sampling method of 261. Data collected by questionnaire which its validity and reliability were confirmed and Cronbach's alpha coefficient was 0.849. Results of tentative analysis and data analysis by structural equation modeling showed that organizational bullying has a positive effect on job stress and job insecurity in employees. Also, the results showed that organizational bullying reduced job engagement among employees