Akwa Ibom State Polytechnic

Ikot-Ekpene, Nigeria

Akwa Ibom State Polytechnic

Ikot-Ekpene, Nigeria

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Ekaluo U.B.,University of Calabar | Ibiang Y.B.,University of Calabar | Ikpeme E.V.,University of Calabar | Ekanem B.E.,Akwa Ibom State Polytechnic | Erem F.A.,University of Calabar
Toxicology and Environmental Health Sciences | Year: 2013

This study was undertaken to determine the effects of Deltamethrin and Ridomil, singly and in combination, on epididymal sperm parameters and reproductive hormone levels of male rats. Thirty two albino rats were divided into four independent treatment groups; A, D, R and C. Group A was the control and did not receive any pesticide treatment. Groups D (100 mg of Deltamethrin/kg body weight), R (100 mg of Ridomil/kg body weight) and C (50 mg Deltamethrin+50 mg Ridomil/kg body weight) received pesticide treatment at forty eight hour intervals for nine weeks, via direct mixing in the animal ration. After nine weeks the animals were sacrificed, blood was collected and epididymal sperm parameters were assessed. Significant (P<0. 001) decreases were observed in sperm count and sperm motility between the control and groups D and C. Sperm viability, sperm head abnormality and pH of semen did not reveal any significant differences (P<0. 05). Follicle stimulating hormone and luteinizing hormone showed significant (P<0. 01) decreases in groups D and C, but no significant differences were observed in testosterone levels. Deltamethrin, and Deltamethrin+Ridomil combination decreased sperm count, sperm motility, and serum gonadotropins of the rats. © 2013 Korean Society of Environmental Risk Assessment and Health Science and Springer Science+Business Media Dordrecht.


Okokon J.E.,University of Uyo | Udoh A.E.,University of Uyo | Frank S.G.,Akwa Ibom State Polytechnic | Amazu L.U.,University of Nigeria
Asian Pacific Journal of Tropical Biomedicine | Year: 2012

Objective: To evaluate the anti-inflammatory and analgesic activities of leaf extract of Melanthera scandens (M. scandens). Methods: The crude leaf extract (39-111 mg/kg) of M. scandens was investigated for anti-inflammatory and analgesic activities using various experimental models. The anti-inflammatory activity was investigated using carragenin, egg-albumin induced oedema models, while acetic acid, formalin-induced paw licking and thermal-induced pain models were used to evaluate the antinociceptive property. Results: The extract caused a significant (P<0.05 - 0.001) dose-dependent reduction of inflammation and pains induced by different agents used. Conclusions: The leaf extract possesses anti-inflammatory and analgesic effects which may be mediated through the phytochemical constituents of the plant.


Solomon M.M.,University of Uyo | Umoren S.A.,King Fahd University of Petroleum and Minerals | Israel A.U.,University of Uyo | Etim I.G.,Akwa Ibom State Polytechnic
Pigment and Resin Technology | Year: 2016

Purpose - The purpose of this paper is to evaluate the performance of polypropylene glycol (PPG), as a corrosion inhibitor for aluminium corrosion in 0.5 M H2SO4 solution at 303-333 K and the effect of addition of iodide ions on the corrosion inhibition efficacy of PPG. Design/methodology/approach - The corrosion inhibition performance of PPG alone and on addition of iodide ions in the acid medium was evaluated using weight loss and electrochemical [electrochemical impedance spectroscopy (EIS), linear polarisation resistance (LPR) and potentiodynamic polarization (PDP)] methods as well as surface analysis approach at 303-333 K. The morphology of the corroding aluminium surface without and with the additives was visualised using scanning electron microscopy (SEM). The trend of inhibition efficiency with temperature was used to propose the mechanism of inhibition and type of adsorption. Findings - Results obtained showed that PPG moderately retarded the corrosion of Al in 0.5 M H2SO4 solution. Addition of KI to PPG is found to synergistically improve the inhibitive ability of PPG. From the variation of inhibition efficiency, K-ads, and E-a, with rise in temperature, physisorption mechanism is proposed for the adsorption of PPG and PPG - KI onto the Al surface in 0.5 M H2SO4 solution. Polarisation results showed that PPG and PPG - KI acted as mixed type inhibitor. The adsorption of PPG and PPG - KI, respectively, onto the metal surface followed El-Awady et al. adsorption isotherm model. SEM and water contact angle analysis confirmed the adsorption of PPG and PPG - KI on Al surface. Research limitations/implications - The research is limited to aqueous acid environment in aerated condition, and all tests were performed under static conditions. Practical implications - The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal. Originality/value - The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal. © 2016 Emerald Group Publishing Limited.


John R.C.,University of Uyo | Itah A.Y.,University of Uyo | Essien J.P.,University of Uyo | Ikpe D.I.,Akwa Ibom State Polytechnic
Bulletin of Environmental Contamination and Toxicology | Year: 2011

The effect of crude oil on the growth of legumes (Calopogonium muconoides and Centrosema pubescens) and fate of nitrogen-fixing bacteria in wetland ultisol was investigated using standard cultural techniques. The results revealed observable effects of oil on soil physico-chemistry, plant growth and nodulation as well as on densities of heterotrophic, hydrocarbonoclastic and nitrogen fixing bacteria. The effects however varied with different levels (0.5%, 1%, 5%, 10%, 15% and 20%) of pollution. Ammonium and nitrate levels were high in the unpolluted soil but decreased with increase in pollution levels. Nitrite was not detected in contaminated soil probably due to the reduction in numbers of nitrogen fixers, from 5.26 ± 0.23 × l0 6cfu/g in unpolluted soil to 9.0 ± 0.12 × 10 5 and 2.2 ± 0.08 × l0 5 cfu/g in soils with 5% and 20% levels of pollution respectively. The contaminated soil also exhibited gross reduction in the nodulation of legumes. A range of 13-57 nodules was observed in legumes from polluted soil against 476 nodules recorded for plants cultured on unpolluted soil. The heterogeneity of the microbial loads between oil-polluted and unpolluted soil were statistically significant (p<0.05, ANOVA). Positive significant relationships were observed between the levels of hydrocarbons and the densities of heterotrophic bacteria (r = 0.91) and that of hydrocarbon utilizing bacteria (r = 0.86). On the other hand, relationships between the densities of nitrogen fixing bacteria and total hydrocarbons content was negative (r = -0.30) while positive relationships were recorded between the densities of different microbial groups and treatment periods except at 15% and 20% pollution levels. The LSD tests revealed highly significant differences (p<0.001) in the physiological groups of soil microorganisms at all levels of pollution. The results imply that crude oil seriously affects rhizosphere microbial growth in legumes. Among the bacterial species isolated, Clostridium pasteurianum, Bacillus polymyxa and Pseudomonas aeruginosa exhibited greater ability to degrade hydrocarbons than Azotobacter sp, Klebsiella pneumoniae and Derxia gummusa while Nitrosomonas and Nitrobacter had the least degradability. A continuous monitoring of the environment is advocated to prevent extinction of nitrogen-fixing bacteria and total loss of soil fertility attributable to petroleum hydrocarbon contamination in the Niger Delta ultisol. © The Author(s) 2011.


Mmom P.C.,University of Port Harcourt | Essiet U.,Akwa Ibom State Polytechnic
Journal of Sustainable Development | Year: 2014

The increasing volume of road traffic and congestion strongly impact on air quality in most urban areas of the developing countries. This paper therefore investigates pollution from automobiles during traffic peak periods at intersections on some selected roads in Uyo, Nigeria. It estimates the level of some selected air pollutants which are largely products of internal combustion in motor vehicle engines, namely: Nitrogen dioxide (NO2), Carbon monoxide (CO), Sulphur dioxide (SO2), and Hydrogen sulphide (H2S), in six sample locations. Monitoring of ambient hourly concentration of NO2, CO, SO2 and H2S, took place at six major intersections in Uyo during morning and evening (peak traffic hours) and afternoon (off-peak hours), hence variations in concentration of these pollutants was determined. Emissions concentration for CO, was found to be higher during the peak periods due to traffic congestion and intersection, where long waiting time for vehicles were observed and however exceeded the Federal Ministry of Environment limits / Standards. Also, the concentration of SO2 was alarmingly high, especially in location C. Levels of Nitrogen oxides (NO2) and Hydrogen sulphide (H2S) measured, varied in time and space and was also above the recommended municipal and international standards in all the six locations during the peak traffic period. This finding thus has implications for public health in the region under study as such calls for the need to control emissions of these obnoxious air pollutants in the city. © 2014 by the author(s).


George N.J.,Akwa Ibom State Polytechnic | Obot I.B.,University of Uyo | Ikot A.N.,University of Uyo | Akpan A.E.,University of Calabar | Obi-Egbedi N.O.,University of Ibadan
E-Journal of Chemistry | Year: 2010

The phytochemistry of Achornea cordifolia leaf extract using different solvents was studied using standard methods. The effects of the leaf extract on some pathogenic bacteria and fungi were also examined. The Phytochemical screening of the leaves shows the presence of useful ethno-botanical bioactive substances such as tannin, saponin, flavonoid, cardiac glycoside and anthraquinone, while alkaloid, phlobatanin and terpene also tested for were absent. The butanol fraction of the extract gives the highest zone of inhibition (13.0 mm) against Staphylococcus aureus, Escherichia coli and pseudomonas aeruginosa, which are in parity. The control, gentamycin injection gives 12.5 mm, 11.0 mm and 12.0 mm respective zones of inhibition against the Staphylococcus aureus, Eschariclia coli and Pseudomonas aeruginosa. Also, the butanol fraction of the extract shows highest zone of inhibition of 17.0 mm against Candida albican, while ethanolic extract gives 13.0 mm zone of inhibition against Trichophyton violaceum.


Solomon M.M.,University of Uyo | Umoren S.A.,King Fahd University of Petroleum and Minerals | Abai E.J.,Akwa Ibom State Polytechnic
Journal of Molecular Liquids | Year: 2015

Poly(methacrylic acid)/silver nanoparticles (PMAA/AgNPs) composite was prepared in-situ and characterized by UV-vis spectroscopy, FTIR, TEM, XRD, and EDS. The anticorrosion performance of the composite was investigated by gravimetric, electrochemical, SEM, EDS, and water contact angle measurements. Results obtained show that PMAA/AgNPs act as corrosion inhibitor for mild steel in 0.5 M H2SO4 solution. Inhibition efficiency increased with increase in concentration and temperature. PMAA/AgNPs composite behaved as a mixed-type corrosion inhibitor and adsorption onto the metal surface followed Temkin adsorption isotherm model. Results from all the surface analyses confirm the formation of PMAA/AgNPs protective film on the mild steel surface. © 2015 Elsevier B.V.


Eddy N.O.,Ahmadu Bello University | Odiongenyi A.O.,Akwa Ibom State Polytechnic | Ameh P.O.,Ahmadu Bello University | Ebenso E.E.,North West University South Africa
International Journal of Electrochemical Science | Year: 2012

Physicochemical parameters of Daniella olliverri (DO) gum exudates were analyzed and the results indicated that the gum is acidic, brownish in colour, ionic and highly soluble in water but insoluble in acetone, chloroform and ethanol. GCMS spectrum of the gum indicated the presence of sucrose, dihex-5-en-2-yl phthalate, stearic acid, 2,6-dimethyl-4-nitrophenol and (E)-hexadec-9-enoic acid. Corrosion inhibition potential of the gum was investigated using weight loss and FTIR methods. Daniella olliverri gum has been found to be a good inhibitor for the corrosion of mild steel in HCl solution. Corrosion inhibition properties of the gum is attributed to the presence of aromatic, suitable functional groups and heteroatoms in its chemical constituents, which facilitated its adsorption. The adsorption of the gum on the surface of the metal was found to be endothermic, spontaneous and supported the mechanism of physical adsorption. The results obtained obeyed the Langmuir adsorption isotherm model.


Eddy N.O.,Ahmadu Bello University | Odiongenyi A.O.,Akwa Ibom State Polytechnic
Pigment and Resin Technology | Year: 2010

Purpose - The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of ITHeinsia crinata/IT for the corrosion of mild steel in H2SO4 solutions. Design/methodology/approach - The inhibition efficiencies were evaluated using weight loss, thermometric and hydrogen evolution techniques while adsorption properties were studied using IR spectroscopy. Findings - The inhibition efficiency of ethanol extract of ITHeinsia crinata/IT varies with concentration of the extract, period of immersion and with temperature. The extract acts as an adsorption inhibitor because of its phytochemical composition. The extract is adsorbed spontaneously on the surface of mild steel according to Temkin and Frumkin adsorption isotherms. The mechanism of physical adsorption is proposed from the trend of the inhibition efficiency with temperature and the values of some kinetic and thermodynamic parameters obtained. Research limitations/implications - The paper provides information on the use of ethanol extract of ITHeinsia crinata/IT as a corrosion inhibitor. Electrochemical studies such as polarisation and AC impedance spectra will throw more light on the mechanistic aspects of the corrosion inhibition. Practical implications - Ethanol extract of ITHeinsia crinata/IT can be used as an environmentally friendly inhibitor for the corrosion of mild steel in H2SO 4. This environmentally friendly inhibitor could find possible applications in metal surface anodising and surface coatings. Originality/value - The paper provides information on an environmentally-friendly corrosion inhibitor. Copyright © 2010 Emerald Group Publishing Limited. All rights reserved.


Okokon J.E.,University of Uyo | Udoh A.E.,University of Uyo | Frank S.G.,Akwa Ibom State Polytechnic | Udo N.M.,University of Uyo
African Journal of Biomedical Research | Year: 2011

Anti-inflammatory and antipyretic activities of leaf extract of Panicum maximum were evaluated to ascertain the folkloric claim of its use in fevers and inflammatory conditions. The crude leaf extract (48-144 mg/kg) of Panicum maximum was investigated for anti-inflammatory and antipyretic activities using various experimental models. The extract caused a significant (p<0.05-0.001) dose-dependent reduction in inflammation and fever induced by different agents used. The anti-inflammatory and antipyretic effects of this plant may in part be mediated through the secondary metabolites present in the plant.

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