Inaugural Lectures

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    Effect of chemical agents on morphology, tensile properties and water diffusion behaviour of hibiscus sabdariffa fibers
    (IISTE, 2016) Azeez, Taofik Oladimeji; Onukwulii, Dominic Okechukwu
    Effective utilization of Hibiscus sabdariffa fibers in composites applications as a reinforcing fibers in polymer matrix have been a major concern due to its poor mechanical and hydrophilic properties. It will be of benefits to environmental and technological advancement, if its properties are properly handled. In this study, the morphological, tensile and water absorption characteristics of H. sabdariffa fibers was aimed to be investigated. H. sabdariffa fibers was modified using sodium hydroxides, sodium lauryl sulphate and ethylene diamine tetraacetic acid. The morphology using scanning electron microscopy, tensile properties (strength, modulus, elongation and energy at break), water absorption and water diffusion behaviours were studied. Chemical modifications improved fiber surface and roughness, tensile strength and modulus, elongation and energy at break with reduced water absorption of H. sabdariffa fibers. The water diffusion behaviour is less - Fickian controlled by water penetration rate. Hence improved the hydrophobic nature of H. sabdariffa fibers.
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    Effects of the chemical treatment of avocado pear wood filler on the properties of LDPE composites
    (Carl Hanser Verlag GmbH & Co. KG, 2019) Government, Rabboni Mike ; Ani, Kingsley Amechi; Azeez, Taofik Oladimeji; Onukwuli, Dominic Okechukwu
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    Occurrence of extended-spectrum β lactamases in Escherichia coli isolated from piggery farms in Imo State, Nigeria
    (Springer Science+Business Media, 2008) Akujobi, C. O.; Ogbulie, J. N.; Alisi, C. S.
    A total of 600 Escherichia coli isolates recovered from pig wastes from three Senatorial Zones of Imo State, Nigeria, were tested for production of extended spectrum b-lactamases (ESBLs) by the double-disk (DD) potentiation method. Of the numbers of isolates made, 190(32%) were positive for the ESBLs production. Results of testing 190 positive isolates for ESBL production by several recommended methods were as follows (percentage detection in parentheses): DD method with aztreonam (91), ceftazidime (82), ceftriaxone (84), or cefpodoxime (94); broth microdilution method with ceftazidime (77) or cefotaxime (96) alone or in combination with clavulanate; and the standard disk diffusion method with new breakpoints and standard concentrations of aztreonam (69), ceftazidime (81), ceftriaxone (77), or cefpodoxime (98) or a novel concentration (5 lg) of ceftazidime (84). These data indi cate that ESBLs occur at a relatively high incidence in our piggery farms and that the standard disks diffusion method with cefpodoxime and the DD method with several b-lactams are practical and cost-effective methods for detecting ESBL-producing isolates of E. coli.