Potentiometric investigations of complexes formed by chromium (III) ion and amino acids have been carried out. The dissociation constants of the amino acids, the stepwise formation constants and the overall stability constants of the metal ions and amino acids complexes were determined. The dissociation constants of the amino acids determined are; alanine (10.29), arginine (12.02), asparagine (9.39), glycine (9.87), histidine (7.01), lysine (9.28), methionine (9.68), phenyalanine (9.61), proline (10.53), threonine (10.31), tryptophan (9.77), and valine (10.28).

The exploitation of supported metals and metallic oxides catalysts is increasingly becoming an issue of special interest in the petroleum industry. This is consistent with necessary need for mitigating separation, recycling and reusability problems coupled with increased production costs associated with free metals, unsupported or homogeneous catalyst systems.

This paper examines the interactions between two spheres in an unbounded fluid. Using bispherical coordinates, no-slip and far-field boundary conditions, an exact solution of Stokes equations for the translational motion of two spheres of arbitrary size and arbitrary orientation with respect to their directions of motion are obtained. This solution is in form of truncated infinite series. The various hydrodynamic forces exerted on the spheres are calculated.

This paper addresses the problem of reliability improvement of k -out of - n system. It first looks at how series system is improved through the improvement of individual components with most reliable components. It also used redundancy (cold and hot) to improve the series system reliability.

A study was conducted on growth and yield of cowpea (Vigna unguiculalta L) under different mulch materials on an Alfisol in the Teaching and Research farm of Ambrose Alli University, in Ekpoma, Nigeria. Mulch materials increased the soil pH, organic carbon, total nitrogen, available phosphorus and carbon exchange capacity of the soil over control. At 3 and 6 weeks after planting, cocoa husk and empty fruit bunch recorded significant higher plant height, leaf area and number of leavers of cowpea plant over cassava peels and control.

Methanolic extracts of leaf, stem and root of Acalypha wilkesiana were investigated with the goal of establishing its acclaimed potency as an anthelmintic and antimicrobial agent. Antimicrobial assay was carried out using the agar cup plate diffusion method. The extracts were tested against 8 human pathogenic microorganisms (5 bacteria and 3 fungi). The leaf and stem methanol extracts exhibited antibacterial and antifungal activities.

Methanolic extracts of the leaves of Phyllanthus amarus and stem of Phyllanthus muellerianus were studied for antileishmaniasis activity, phytotoxicity and cytotoxicity. The antileishmanial activity was evaluated in vitro using promastigote culture of Pakistani leishmanial strain (L. major) in 96 well micro titer plate bioassay, while phytotoxicity was assessed using the Lemna bioassay and cytotoxicity using brine shrimp lethality assay. Methanolic extract of stem of P.

Oil extracted from ripe peel of Musa paradisiaca (plantain) was analyzed for physicochemical properties and fatty acid constituents using standard methods. The results revealed that the acid value, peroxide value and specific gravity were significantly (p<0.05) higher than those of soybean oil whereas saponification value, iodine value, ester value, boiling, smoke, flash and fire points were significantly lower than in soybean oil. The percentage yield of the oil from the peel of M. parasidiaca fruit was 6%.

A new way of introducing a parameter to expand a family of exponential and Weibull distributions is introduced and studied. It is applied to yield a new two-parameter extension of the bivariate exponential distribution which may serve as a competitor to such commonly used two-parameter family of the life distribution as the Weibull, gamma and lognormal distributions. The general method is applied to give a new three-parameter Weibull distribution.

As the current global environmental concerns have prompted regulations to reduce the level of aromatic compounds, particularly benzene and its derivatives in gasoline, hydroisomerisation of n-alkanes is becoming a major alternative for enhancing octane number. Series of solid acid catalysts comprising of Freidel crafts, zirconias, MoO3-based (MOB), chlorinated Al2O3, heteropoly acids and bifunctional zeolite based catalysts have been tested in this respect.