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Articles by S.P. Antai
Total Records ( 3 ) for S.P. Antai
  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.
  J.P. Essien , S.P. Antai and N.U. Benson
  M.G. Ekpenyong and S.P. Antai
  The toxicity of various concentrations of cadmium on the growth of species of Bacillus and Pseudomonas on Nigerian light crude oil was investigated. Acclimation periods of the organisms in the crude oil broth were extended from 24 to 72 h depending on metal concentration and test organism. Growth rate at exponential phase was reduced from 0.16 to 0.026 h-1 in Bacillus sp. and 0.2 to 0.07 h-1 in Pseudomonas sp. High concentrations (1000 mg L-1) of cadmium selected resistant strains of Bacillus sp. which maintained a growth rate of 0.02 h-1 from 72 to 384 h of the study, whereas growth rate of Pseudomonas sp. decreased gradually throughout the study period. Some viable cells of Pseudomonas sp. died out during prolonged exposure to low concentrations (≤10 mg L-1) of cadmium, but nevertheless escaped spectrophotometric detection. The results from this study suggest that total viable counts data are more reliable in metal toxicity studies than optical density measurements of growth. The results obtained also showed that although Pseudomonas sp. was a better degrader of crude oil than Bacillus sp., the later would be more suitable for bioremediation of oil-polluted environments co-contaminated with cadmium, than the former.
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