Iranian Journal of Science and Technology, Transactions A: Science最新文献

Spontaneous quaternary fission accompanied by two α particles for isotopes ³⁰⁴120 in both equatorial and collinear configurations, and for ^298,302120 in the equatorial configuration has been studied using Coulomb and proximity potential model with the inclusion of deformation and orientation of fragments. The most favourable quaternary fission channel is determined using cold reaction valley and relative yield plots. In the case of ³⁰⁴120, the equatorial emission of light charge particles displays distinct peaks, reaching a peak relative yield of approximately 33.65%. In contrast, collinear emission shows continuous peaks with a maximum relative yield around 1.27%. The peak relative is attributed to the presence of nuclei ¹²¹In for equatorial emission, and ¹²²I, ¹⁹²Au, ⁹⁷Ru and ⁴²Cl for collinear emission. For the parent isotopes ³⁰²120 a peak relative yield around 19.44% is obtained for combination containing nuclei ¹²²Ag, whereas in the case of ²⁹⁸120, fission channels result in a maximum relative yield of approximately 22.08% with one fragment as ¹²²Ag. The mentioned nuclei are found to possess either a magic number of protons or neutrons leading to shell closure. In addition to closed shell effect, the inclusion of deformation factors β_2, β₄ and orientation of fragments have a prominent role in determining the relative yield of a particular fission channel.

In this study, we present a technique for enhancing the order of approximation of the modified form of the Bernstein operators that Usta F. achieved. Moreover, two novel operators with degrees of approximation one and two are obtained. Furthermore, we validate a few theoretical findings such as the Korovkin theorem, Voronovskaja theorem, modulus of continuity, etc. about the rate of convergence of these operators. In the end, we operate graphs and tables to illustrate the comparison between the constructed operators and compute the numerical verification of the theoretical conclusions.

Pathak (2011) introduced variation diminishing wavelets and wavelets of specified changes in sign by utilising Schoenberg’s notion of variation-diminishing integral operators of convolution type. In this paper, we introduce some generalized variation diminishing wavelets based on the Hartley kernel and the Boas transforms. In particular, we introduce wavelets with specific changes of sign and wavelets based on Tanno’s form of convolution kernels.

The genus Prunus is among the main species cultivated in Tunisia, due to its economic importance. In this study, genetic diversity and relationships among Tunisian Prunus species was explored using six specific SSR chloroplastic primers (cpSSR) of Rosaceae. The parameters of polymorphism were estimated and showed 5.831 alleles per locus, among them, 1.315 were effective alleles, giving a Shannon’s information index of 0.323. Twelve haplotypes were shared by more than one accession, while 55 haplotypes were accession-specific, confirming the effectiveness of cpSSR as good markers for molecular characterization and identification of Prunus species. Furthermore, the important haplotype diversity proved the allelic singularity of the Tunisian genotypes, considered as a valuable gene pool repository for future breeding programs. Moreover, the results obtained highlighted the ancient origin of the Tunisian Prunus genotypes. The UPGMA dendrogram, the model based Bayesian clustering, PCA analysis and Nm values are clearly consistent with a genetic structuring and showed a high level of differentiation within the genus. Although, the classification of Prunus genus has been controversial issue, our results showed that chloroplastic genome may supply information regarding the evolutionary history of members of Prunus genus. To conclude, this work joins to other studies to demonstrate the effective power of single- parent organelle markers for molecular characterization and population genetic studies.

The article focuses on computer simulations of moire patterns in graphene film on a copper substrate. The surface potential simulates the influence of the substrate on the graphene film. The substrate potential is calculated from the Lennard-Jones paired potential. The interaction between carbon atoms is also determined by the Lennard-Jones potential. It is shown that for two-dimensional structures the parameters of the pair potential differ from the three-dimensional analogue. The simulation results in moire structures in the graphene film. We perform calculations for different orientation angles of graphene relative to the crystal lattice Cu(111). The moire superlattice period decreases with increasing angle between the bond directions of the graphene atoms and the main crystal lattice directions of the substrate. The results of the calculations are in good agreement with the experimental data.

Colorectal cancer (CRC) ranks third in malignant tumor mortality worldwide. Oxaliplatin, a third-generation chemotherapeutic drug, treats several malignancies, including colorectal cancer, after cisplatin and carboplatin. However, reducing side effects and optimizing efficacy is challenging. The utilization of plant-assisted green synthesis for the production of nanoparticles is a cost-effective and environmentally sustainable approach. This method could be at the forefront of chemotherapy due to its simplicity and efficiency. The ginger extract has been well-introduced with anti-cancer and antioxidant properties. The present study involved the green synthesis and characterization of oxaliplatin nanoparticles (OxPt NPs) through dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma spectroscopy (ICP), field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM). This study investigated the effectiveness of OxPt NPs, ginger extract, and conventional oxaliplatin (first-line drug of CRC) on the HCT116 colorectal cancer cell line through MTT assay comparatively. The findings exhibited an outstanding efficiency of 72% in the synthesis process of OxPt nanoparticles and their subsequent encapsulation utilizing ginger extract. The nanoparticles demonstrated a size distribution within the 50–110 nm range and exhibited remarkable stability in colloidal form. The MTT assay results indicate that the OxPt NPs showed a favorable cytotoxic effect on colorectal cancer cells, as evidenced by an IC₅₀ value of 7.08 µM. Furthermore, flow cytometry data show that the nanoparticles primarily induced apoptosis as the mechanism of cell death rather than necrosis. The findings indicate that the synthesized OxPt NPs can be a new and efficient medication for addressing CRC. Overall, the present investigation showcases the efficacious amalgamation and delineation of OxPt nanoparticles, exhibiting their potential cytotoxic impacts on colorectal cancer cells.