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Articles by J.P. Essien
Total Records ( 4 ) for J.P. Essien
  G.A. Ebong , H.S. Etuk and J.P. Essien
  Top soil samples from a mechanized farm located in Awot Uta, Akwa Ibom State in the Niger Delta Region of Nigeria were analyzed using atomic absorption spectrophotometer for their Cr; Cd; Fe; Cu; Zn and Pb concentrations. Top soil samples were also collected from a local farm situated close to the study area and analyzed for their metal contents. The following mean concentrations were observed in the mechanized farm: 0.343±0.200 mg kg-1 for Cr; 0.012±0.006 mg kg-1 for Cd; 0.959±8.814 mg kg-1 for Fe; 0.031± 0.011 mg kg-1 for Cu; 0.169±0.041 mg kg-1 for Zn and 0.010±0.005 mg kg-1 for Pb. While the local farm recorded the following concentrations: 0.115±0.005 mg kg-1 for Cr; 0.001±0.001 mg kg-1 for Cd; 22.115±3.351 mg kg-1 for Fe; 0.015±0.004 mg kg-1 for Cu; 0.098±0.008 mg kg-1 for Zn and 0.001±0.001 mg kg-1 for Pb. Generally, the metal levels obtained in the mechanized farm were higher than their corresponding levels in the local farm. Although the metals loads were within the recommended standards for agricultural soils, the elevated loads obtained from the mechanized farmland is of serious health implications because of the attendant metals effects on the food chain. Coefficient of variations were also calculated for the metal concentrations in the mechanized farm and results obtained indicated Cr as having the highest CV value (58%) while Fe had the lowest (22%).
  B.N. Ita , G.A. Ebong , J.P. Essien and S.I. Eduok
  Contents of Ni, Cu, Pb, Mn, Cd and Zn in edible fungal sporocarps and soil from the Niger delta wetlands were determined. Results revealed a species-dependent bioaccumulating potential. Armillariella mellea had the highest content of Zn and Pb, while Pleurotus sapidus had the lowest bioaccumulating potential for Ni, Pb and Cu. Generally, the heavy metal accumulating potential decreased in the trend:Zn>Mn.Cu>Ni>Pb>Cd and were inferior to the FAO/WHO (1976) dietary standards. There was significant correlation (p<0.05) between soil Cd/Cd content in Agaricus biosporus and soil Zn/Pb content in Agaricus biosporus. However, the presence of detectable amounts of Pb and Cd may be a pointer to health risk associated with excessive consumption, particularly during harvest periods, and should be avoided.
  J.P. Essien , S.P. Antai and N.U. Benson
  J.P. Essien , S.P. Antai and N.U. Benson
  In this investigation the extent to which sediment salinity gradients can be used to predict the sensitivity of microbial populations in mangrove ecosystem was investigated. The microbial groups monitored were heterotrophic bacteria, coliform bacteria, actinomycetes, fungi and yeasts. Pearson`s Product-Moment Correlation (r) analyses were done on Log10 - transformed estimates of population densities. The values obtained from the intertidal (epipellic) and subtidal (benthic) sediments were less than the critical value of 0.707 (n = 8, p = 0.05). This indicates that salinity was less closely related to the microbial population densities. A positive but insignificant relationship was found for fungi (r = 0.03) in intertidal sediment. The total heterotrophic bacteria (r = -0.69), coliforms (r = - 0.54), actinomycetes (r = -0.43) and yeasts (r = - 0.56) were negatively affected by salinity in epipellic sediment. But in the benthic sediment, total heterotrophic bacteria (r = 0.55) and unexpectedly, the fungi (r = 0.58) and actinomycetes (r = 0.29) exhibited positive but insignificant correlations while coliform and yeast counts in the benthic sediments were negatively influenced by salinity. However the coefficient of determinations (R2) revealed that total heterotrophic bacteria (48.06%) and yeasts (31.18%) were more extensively distributed in the intertidal sediments than coliforms (29.38%), actinomycetes (18.68%) and fungi (0.09%). In contrast, the fungi (33.48%) demonstrated a wider distribution in benthic sediment. This may be ascribed to their existence, mostly as dormant, but culturable spores in the anoxic bottom sediment. The weak relationship exhibited by coliforms further confirms their usefulness as indicator of faecal contamination in estuarine ecosystem.
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