Showing 3 results for Bazgir
Volume 3, Issue 2 (Summer 2019)
Abstract
In order to develop the scope of application of polymer materials in the preparation of drilling fluids, in this study, various blends of wheat starch and copolymer of sulfonated polyacrylamide were prepared and the rheology and compatibility behavior of samples under different salinity and aging conditions were evaluated. The rheological behavior of starch-polyacrylamide blends in tap water and saturated brine water showed that the viscosity of the samples increased with increasing concentration of polyacrylamide copolymer in the both media. However, starch-polyacrylamide blends in saturated brine had less viscosity than tap water. It was observed that in both tap water and salt water saturated conditions after 4 hours of aging at 90 ° C, the viscosity of most samples increased. Comparison of the curves for empirical viscosity data and prediction of the mixing rule showed that in both of tap water and salt saturated water, positive deviation from the mixing rule is observed, which indicates the compatibility between the blend components. By performing the aging process, although positive deviation was still observed, this positive deviation slightly decreased, which means the negative effect of aging on the compatibility of the starch- copolymer of sulfonated polyacrylamide blend.
In conclusion, the results of this study showed that the blend of starch- sulfonated polyacrylamide copolymer is compatible at high temperature (90 °C) and saturated NaCl salt wate. Moreover, in some samples, this compatibility exists even after aging.
Somayeh Dariush, Mostafa Darvishnia, Ali-Akbar Ebadi, Fereidoun Padasht-Dehkaei, Eidi Bazgir,
Volume 9, Issue 3 (5-2020)
Abstract
Brown spot, caused by Bipolaris oryzae, is a devastating disease of rice which can cause yield loss in most rice-growing regions of the world. Breeding for disease resistance is the preferred strategy of managing brown spot. Hence, identification and subsequent development of disease resistance in rice genotypes are crucial. The field resistance of 95 rice genotypes to brown spot was evaluated under water and fertilizer stress during 2017 and 2018. Partial resistance was assessed through reaction type (disease rating) and epidemiological parameters estimates i.e. final brown spot index, area under disease progress curve and apparent infection rate. Disease rating, brown spot index, and area under disease progress curve detected differences in the responses of rice genotypes to disease under field condition, which could be used to study brown spot resistance. Among the genotypes tested, 22 genotypes were resistant to moderately resistant (23.16%) while majority were moderately susceptible to susceptible (76.84%). A significant correlation between leaf angle and area under disease progress curve indicated positive influence of leaf erectness on severity of brown spot disease. Results showed that leaf infection did not significantly affect the number of filled grains per panicle or hundred seed weight, but caused yield decline by decreasing the number of productive tillers. Nevertheless, the infection of rice genotypes from flowering to ripening stages decreased the number of filled grains per panicle and grain weight. The resistant genotypes identified in this study can be exploited for future rice breeding programs to develop promising resistant lines in management of the brown spot disease.
Volume 12, Issue 3 (Summer 2024)
Abstract
Aims: Osteoporosis is one of the most common diseases among women, and dietary patterns, especially during adolescence, significantly impact its occurrence and prevention. The present study examined the determinants of osteoporosis in female students at the first secondary school level in Ilam City based on the health belief model.
Instrument & Methods: This cross-sectional study involved 819 participants selected by a two-stage cluster random sampling approach. Data were collected using a 52-item researcher-developed questionnaire based on the health belief model and analyzed using descriptive tests, Pearson’s correlation, multiple linear regression, one-way analysis of variance, and Chi-square test by SPSS 22 software.
Findings: The average age of participants was 13.72±0.97 years, with an age range of 12 to 16 years. Also, 22.2% of participants had a family history of osteoporosis. Additionally, 29.2% and 22.6% of the participants reported a history of calcium and vitamin D supplement intake in the last month, respectively. The health belief model constructs accounted for a total of 18.9% of the variance in behavior. Perceived barriers and perceived self-efficacy were identified as the most important predictors of behavior, while other constructs were not significant predictors despite showing significant correlations with behavior.
Conclusion: The constructs of self-efficacy and perceived barriers directly affected nutritional behavior preventing osteoporosis among teenage girls in Ilam City, while another construct had an indirect effect.
