Bu-Ali Sina University

About: Bu-Ali Sina University is a education organization based out in Hamadan, Hamadān, Iran. It is known for research contribution in the topics: Catalysis & Adsorption. The organization has 4078 authors who have published 7969 publications receiving 122828 citations.

Pd immobilized on modified magnetic Fe 3 O 4 nanoparticles: Magnetically recoverable and reusable Pd nanocatalyst for Suzuki-Miyaura coupling reactions and Ullmann-type N -arylation of indoles

Abstract: The Pd supported on amidoxime (AO)-functionalized Fe3O4 (Fe3O4/AO/Pd) hybrid material was used as an effective and recyclable nanocatalyst in Suzuki-Miyaura coupling reactions. The catalyst was very effective for the Suzuki-Miyaura reaction of aryl halides (Ar–I, Ar–Br, Ar–Cl) with phenylboronic acid and conversion was excellent in most cases. The yields of the products were in the range from 7–98%. The catalyst showed good stability and could be recovered and reused for six reaction cycles without a significant loss in its catalytic activity. Also, a wide range of N-arylated indoles are selectively synthesized through intermolecular C(aryl)–N bond formation from the corresponding aryl iodides and indoles through Ullmann-type coupling reactions in the presence of the prepared catalyst.

A simple critical state approach to predicting the cyclic and monotonic response of sands with different fines contents using the equivalent intergranular void ratio

Abstract: This paper focuses on developing a simple approach to describing the monotonic and cyclic behavior of sands with fines by employing the concept of equivalent intergranular void ratio, e , in the critical state soil mechanics framework. To establish and evaluate this approach, which facilitates the process of predicting the soils behavior and minimizes the experimental work required, a large number of datasets published in the literature for 10 different types of soils are processed and analyzed. The proposed approach makes it possible to predict the behavior and resistance of sands in a unique way for all the fines contents, stress levels and densities, without the need for performing tests at different fines contents. The issue of determining the b value, used as a physical constant in the definition of e , and the factors affecting it is studied. In this context, a recently established b-predicting equation is evaluated and its empirical parameters are calibrated with various datasets. Examining the influence of grading parameters on the b value resulted in a strong relationship between b and the particle size ratio. The results also show that the b value can be reliably estimated using the experimental data available at only two fines contents of 0 and 23 %.

Molecular detection of Anaplasma marginale and Anaplasma ovis in sheep and goat in west highland pasture of Iran

Abstract: Objective To determine the prevalence of Anaplasma marginale (A. marginale) and Anaplasma ovis from sheep and goat in different highland pasture in west of Iran. Methods From July 2015 to October 2015, 370 blood samples of sheep and goat were collected from different regions in Hamedan province, Iran. The DNA extracted from blood and subsequently, 16S rRNA and MSP4 genes were analyzed by nested-PCR, semi nested-PCR and RFLP methods. Results In the PCR assessment, overall 27.5% (102/370) of sheep and goat were positive for Anaplasma ovis and A. marginale infection, which was lower than reports from tropical and subtropical regions of Iran. Statistical analysis (the Chi-square test) did not show any significant relation between infection and variables such as location, tick infestation age and sex (P > 0.05). No significant correlation between the altitude and the Anaplasma species infection was found (Mann–Whitney test: P > 0.05). However, Anaplasma infection in goat significantly is more than the sheep (P = 0.008). Conclusions The ecological changes affect the frequency and distribution of Anaplasma species. Furthermore, our results indicate that sheep as potential reservoirs of A. marginale.