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Showing 4 results for Babaeian
Volume 12, Issue 1 (12-2020)
Abstract
DNA methylation detection by a novel fluorimetric nanobiosensor for early cancer diagnosis Quantum dots as a fluorescent probe are applied for cell biology, DNA transformation, biomedical imaging and cancer therapy. Biological based synthesis of nanoparticles would be more efficient and environment friendly rather than chemical approaches. In the present study, quantum dots have been synthesized through leaf methanolic extracts. The obtained results by UV-vis spectroscopy, TEM, FT-IR and fluorescence spectroscopy showed the presence of synthesized CdS quantum dots. Yellow and orange colors of obtained solution was also indicated the successful synthesis of CdS quantum dots. The maximum UV-Vis spectrum absorption of quantum dots was observed at 410 nm. Results of fluorescence analysis also showed that emission bands were at 475, 490 and 675 respectively which indicated the synthesis of different CdS quantum dots in different pH values. Obtained nanoparticle were spherical and at the range between 2-10 nm according to TEM analysis. FT-IR analysis also showed that the proteins, leucine and lysine amino acids, phenols and other functional groups present in physalis extracts would be determining factors for reducing CdS ions and converting them to quantum dots.
Volume 12, Issue 3 (11-2023)
Abstract
Early blight caused by Alternaria solani is a prominent tomato, Solanum lycopersicum, disease that destroys a significant part of tomato production worldwide. Cultivating resistant cultivars is notably important in reducing damage caused by early blight disease. Therefore, comprehending the response of different genetic backgrounds to pathogen infection could enhance understanding of the mechanisms involved in plant defense systems against pathogen invasion. In the present study, the differential response of susceptible and resistant tomato genotypes to A. solani was investigated from molecular and physiological aspects. The results showed that soluble sugar content in the resistant genotype increased after pathogen inoculation. Although photosynthetic pigments such as carotenoid, chlorophyll a, and chlorophyll b content decreased in susceptible and resistant genotypes, fluorescence chlorophyll indices differed in resistant and susceptible genotypes. Also, transcription analysis revealed that in the resistant genotype, the expression of SlWRKY1 was 2.58 times more than the control at 48 hpi (hours post inoculation). However, in the susceptible genotype, the expression of the SlNAC1 was 69.12 times more than in control at 24 hpi. The findings of this research provide an improved understanding of tomato plant defense mechanisms against early blight disease.
Volume 13, Issue 2 (Fall & Winter 2009)
Abstract
According to the computational and physical simplifications used in regional climate models and numerical weather prediction models, none of them can predict the weather and climate accurately. A fully statistical technique, named MOS, has been recently used for calibration and decreasing of the errors in numerical models. Physiographic characteristics, climatic behavior and regional synoptic climatology are not included in this technique. For overcome to this deficiency, an empirical model, named PSP , including topographic, climatic and synoptic behavior of the region under study has been developed for downscaling of numerical models outputs in to computational grid-points for determination of daily precipitation. Daily 2.52.5 degree GFS data from NOAA has been used for running the model. More than 85 weather systems has been studied in the period of 2002-2007 and coefficients of the model has been determined gradually by using statistical regression between model and observed precipitation. Model
outputs in surface and 500hpa levels have been used as input of the PSP
model during each weather system affecting Iran. Then we compared model outputs with actual weather data reported by synoptic stations. A Climatic and Physiographic Index named CPI defined for all of synoptic stations of Iran. Monthly mean precipitation, monthly mean temperature, monthly number of days with precipitation, station latitude and height of station from sea level are included in CPI index. CPI index was used for determination of daily precipitation amount of synoptic stations. CPI can be used for climate classification and climate change issues as well. Using PSP parameters in each station under study then plots the PSPs charts. Finally using regression equation between model PSP and actual precipitation can compute daily precipitation amount in millimeters.
B. Soltani, M. Babaeian, H. Ghasemi,
Volume 20, Issue 7 (July 2020)
Abstract
Incremental forming method with lower cost and more flexibility can be a suitable alternative for traditional methods of the hole-flanging. In this study, the possibility of square hole-flanging of AL1050 aluminum sheet using incremental forming method has been investigated and the quality of the pyramid flange has been compared with conical flange. The final shape of the flange is defined so that wall angle increases with raising height. The process simulation was performed using Abaqus software and an experimental test was done to validate the simulation results. After performing the experimental tests, flange features such as the final size of the hole, flange height, and wall thickness were measured. The results showed that at the created flange around the circular hole, there is less spring back and more dimensional accuracy, however, it can be flanged a square hole by incremental approach with consideration of the height and hole size. The dimensional measurements showed that the final size of the hole will increase after the hole-flanging. By investigation of the various holes, it was found that in the larger initial hole, increasing the hole size after the flanging will be lower.
