NIPES Journal of Science and Technology Research, 2020
The Coulomb energy for different nuclear model with small computing effort and high accuracy is a... more The Coulomb energy for different nuclear model with small computing effort and high accuracy is a great challenge in physics as well as in quantum chemistry research. In this work we applied a classical electrodynamics theory and derived a simple procedure and expression for calculating the Coulomb energy for atomic nuclei taking into consideration the finite size of protons. The corresponding results are compared with the direct Coulomb energy obtained from two-parameter Fermi distributions. The formula obtained, which varies directly to the proton number and varies inversely to the cube root of mass number, was applied and calculated numerically the values of Coulomb energy for light, medium and heavy nuclei. To examine the effect of finite size of proton on Coulomb energy, a graph of Coulomb energy as a function of proton number was presented. The results obtained showed that due to the finite size of proton, the values of the previously calculated values of the Coulomb energy are reduced by less than 2%. This is because the protonproton distance increased due to finite size effect of the proton and thus affects the magnitude of the Coulomb energy. This showed that calculation of Coulomb energy by taking into consideration, the finite size of proton leads to agreement with the experimental values. Thus, in studying the nuclear structure, it is very natural to assume the protons to be extended rather than point charges.
NIPES Journal of Science and Technology Research, 2020
The population health risk due to heavy metal exposure has been becoming serious and worldwide en... more The population health risk due to heavy metal exposure has been becoming serious and worldwide environmental issue that has attracted considerable public attention. In this study, the level of heavy metal (Cd, Cr, Fe, As and Pb) in soil samples were determined using Atomic Absorption Spectrophotometer methods (AAS) to assess heavy metals contamination of soil due to mining activities around Gombe, Nigeria. The results obtained showed that the highest concentrations of 96.7271±2.770 mg/kg for Fe were observed in Unguwar Baka I, 25.5355±1.782 mg/kg for Pb were observed in Unguwar Baka I, 21.9673±2.047 mg/kg for Cr were observed in Tumu, 12.9675±1.969 for Cd were observed in Unguwar Baka I and 0.5782±0.025 mg/kg for As were observed in Unguwar Baka. In all the sampling locations, the levels of heavy metals in soil samples measured have the variation pattern in the order: Fe > Cr > Pb > Cd > As. The levels of the Fe, Cr, Pb, Cd, and As are higher than the World Health Organization (WHO) permissible limits in soil. This indicates that their concentration in the soil had the higher capability to pose severe health risk to the community of that area. This information will contribute to awareness of the potential impacts of heavy metals pollutants around the mining area of Gombe state.
Aims: This study presents the first structural model and proposed the identity of four important ... more Aims: This study presents the first structural model and proposed the identity of four important key amino acid residues, Asp13, Arg51, Ser131 and Asp207 for the stereospecific haloalkanoic acid dehalogenase from Rhizobium sp. RC1. Methodology and results: The enzyme was built using a homology modeling technique; the structure of crystallized L-DEX YL from Pseudomonas sp. strain YL as a template. Model validation was performed using PROCHECK to generate the Ramachandran plot. The results showed 80.4% of its residues were located in the most favoured regions suggested that the model is acceptable. Molecular dynamics simulation of the model protein was performed in water for 10 nanoseconds in which Na + was added to neutralize the negative charge and achieved energy minimization. The energy value and RMSD fluctuation of Cα backbone of the model were computed and confirmed the stability of the model protein. Conclusion, significance and impact of study: In silico or computationally bas...
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Papers by aliyu adamu