Browsing by Author "Njoku, H. O."

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    Bacterial contamination of some edible shellfish harvested from Kalarugbani Creek, River State, Nigeria
    (Tapas Institute of Scientific Research and Development, 2011) Odu, N. N.; Njoku, H. O.; Igwiloh, N. J. P.; Akujobi, C. O.
    The bacteriological quality of raw shucked oyster (RSO), raw extracted periwinkle (REP), overlying water (OLW) and mud flat samples (MFS) obtained from Kalarugbani Creek in Rivers State was investigated. The parameters investigated were the total viable count (TVC), salmonella-Shigella counts (SSC), total faecal coliforms (TFC) and total coliform counts (TCC). There were variations in the values of these parameters analyzed, which were sample dependent. Of all the samples analyzed, RSO had the highest microbial counts except for TFC and TCC in which periwinkle has higher counts. Statistical analysis of the mean total viable counts showed high significant differences among the four samples across various months at (p≤0.05). The microbial counts were lower in the wet season and higher in the dry season. Correlation analysis of the seasonal variations of the total viable count for the various samples showed a very weak correlation between the two seasons for MFS and OLW (r= 0.499 and r= 0.515, respectively), while those of REP and RSO were strongly correlated between the two seasons (r= 0.69 and r= 0.607, respectively). The microbial counts obtained from this study were found to be higher than the specified standard limits (1x105 cfu/g) for bacteria by International Commission on Microbiological Specification for Foods (ICMSF) and United States Food and Drug Administration (USFDA). The results of this study show the presence of organisms of public health concern and highlight the need for maintenance of quality standards in the processing of these shellfish. The data obtained will be useful for the development of food safety schemes and policies.
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    Effect of different organic nutrient supplements on the total heterotrophic counts and diesel oil degradation in diesel polluted soil
    (International Formulae Group, 2009-12) Akujobi, C. O.; Njoku, H. O.; Abanno, N.; Okorondu, S. I.; Ogbulie, J. N.
    The effect of graded quantities of different organic nutrient supplements on the total heterotrophic counts and diesel oil degradation in diesel-polluted soil was studied. Soil samples were mixed with different volumes of diesel to obtain heavy and moderate pollution, which was subsequently amended with different quantities of organic nutrient supplements. Total heterotrophic counts were determined at two weeks intervals for 16 weeks and the oil and grease content were determined at the beginning and at the end of the study. The result showed a general increase in microbial count with increase in the quantities of supplement. Poultry waste-amended samples had the highest count in all the samples followed by pig waste and cow dung-amended samples. Diesel oil degradation followed the same order with the highest percentage oil degradation obtained in poultry waste-amended samples. It therefore, showed that poultry waste is the best organic waste to be applied in a bio degradation process.