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Articles by Akan B. Williams
Total Records ( 2 ) for Akan B. Williams
  Akan B. Williams and M. Adediran Mesubi
  Two fish species of tilapia, Tilapia guineensis and Sarothorodon melanotheron were sampled from Lagos Lagoon and Agboyi Creek between December, 2008 and September, 2009 during the dry and wet seasons. They were analysed for organochlorines: aldrin, dieldrin, endrin, DDT, heptachlor, HCH, endosulfan, chlordane and methoxychlor. The muscle tissues and organs of the fishes were subjected to cold extraction and clean-up. The detection and determination of the organochlorine residues were performed using a gas chromatograph with a 63Ni electron capture detector. All the fishes had condition factor >1. The organochlorine residues in the fishes in Lagos Lagoon were more than the level in Agboyi Creek while a higher concentration of the residues was observed during the dry season. The muscle tissues of the female fishes accumulated higher organochlorines than the muscle tissues of the male fishes. Tilapia guineensis accumulated higher residues in Agboyi Creek while Sarothorodon melanotheron accumulated higher residues in Lagos Lagoon. The order of accumulation of residues was gills>livers>small intestines>kidneys>muscles. Except for endrin and heptachlor, the estimated daily intakes of the organochlorines were within the acceptable daily intakes while the levels of residues in the fishes were within the permissible residue limits.
  Nsikak U. Benson , Joseph P. Essien , Akan B. Williams and Godwin A. Ebong
  Total hydrocarbons concentration in four commercially available shellfishes (Ocypoda africanus, Macura reptantia, Procambarus clarkii and Penaeus notialis) from coastal waters of the Niger Delta region of Nigeria were investigated between June 2003 and February 2004 using standard methods. Levels of total hydrocarbons varied significantly depending on biota species, feeding habit and season. The seasonal mean concentrations reported were: 3.98±0.69, 7.95±1.18, 2.24±0.39 and 5.85±0.57 μg g -1 dry weight for M. reptantia, O. africanus, P. clarkii and P. notialis respectively during the wet season. Enhanced concentrations recorded during the dry season were 7.81±2.32, 11.59±2.63, 6.16±2.12 and 9.69±1.90 μg g-1 dry weight for M. reptantia, O. africanus, P. clarkii and P. notialis, respectively. The results obtained indicated seasonal variations which might have been associated with an incidental crude oil spill recorded during the investigation. In general, O. africanus showed higher levels of total hydrocarbons than other species investigated. However, biota species demonstrated hydrocarbon bioaccumulation potential. Regression between the monthly concentrations of total hydrocarbons in each of the biospecimens with the levels in the surface water and sediments indicated statistically significant (p<0.05) relationships. Moreover, comparison of the seasonal mean concentrations using paired sample t-test at 95% confidence level indicated that the concentrations between the dry and wet seasons were statistically significant.
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