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Search Results: 1 - 10 of 190038 matches for " O.W. Obot "
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Laboratory Studies on Phosphorus Removal from Nigeria’s Agbaja Iron Ore by Bacillus Subtilis  [PDF]
C. N. Anyakwo, O.W. Obot
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.109063
Abstract: The investigation into whether or not Bacillus subtilis can remove phosphorus from the Nigerian Agbaja iron ore was carried out with careful monitoring of the population of the removing agent as well as pH of the system. 1.00mm/0.50mm, 0.50mm/0.25mm, and 0.25mm/0.125mm ore fractions obtained from sieving of the crushed iron ore in Shital Test kits, were used in sub-merged culture of nutrient broth (NB) medium for 10 weeks. B. subtilis which was part of the rich microflora found on the ore surface was cultivated in nutrient-rich media and later inoculated in sterilized 100ml of NB in 250ml conical flask and 1g of each of the equally sterilized ore fractions was added. At weekly intervals, a set of samples was removed, treated through series of chemical reactions to obtain ammonium phosphomolybdate precipitate which was back-titrated with 0.1 N-HCl to determine the amount of phosphorus left in samples and consequently, the amount removed. The laboratory investigations found out that B. subtilis has the capability to remove phosphorus from the Nigerian Agbaja iron ore, recording an impressive average of 65.73% P. Also found out was the systematic reduction in bacterial cells count in colony forming unit per mililitre, the initial load 3.4x105 cfu/ml increased to 4.8x107 cfu/ml from where it declined to 1.3x106 cfu/ml, which justified the pH trend observed during the process of cumulative phosphorus removal. The reduction in microbial activity may be attributed to antimicrobial components of the ore, pyrite, and other heavy metals which may have affected the phosphorus uptake from ore.
Optimizing Utilization of Petroleum Coke in Nigerian Metallurgical Industry  [PDF]
E.J. Akpabio, O.W. Obot
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.103018
Abstract: Utilization of petroleum coke in the rejuvenating Nigerian metallurgical industry is currently satisfied by importation from more industrialized nations of the world such as the USA, Brazil and Venezuela where delayed coking plants operate and grow in number. The sad years of poor planning have revealed lapses in integration and synergic planning of our industrial complex. The sources of petroleum coke feedstock have been identified and confirmed as atmospheric and vacuum residues of Nigerian refineries. Analysis has portrayed a symbiotic relationship between the metallurgical industry as one of the major end users of various petroleum coke grades, the shot coke, the sponge coke and the needle coke, and the petroleum industry on its part benefiting while providing ready market for steel sheet metals for even coke drum manufacture. This effort shall greatly increase the Nigerian content in these key industrial sectors, with the resultant reduction in capital flight through importation, if rethinking, and re-strategizing are injected into our industrial planning, and revamps models. Redesign options of existing refineries and reengineering of newly proposed refineries should contain resid processing units such as Delayed Coking Plant which will deepen conversion of residual petroleum feed stocks and produce various petroleum coke grades for utilization in power generation sector and our growing metallurgical and electrode industries.
Phosphorus Removal Capability of Aspergillus Terreus and Bacillus Subtilis from Nigeria’s Agbaja Iron Ore  [PDF]
C.N. Anyakwo, O.W. Obot
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.912082
Abstract: Comparative phosphorus removal capability of a microbial fungus-Aspergillus terreus and a bacterium-Bacillus subtilis from Nigeria’s Agbaja iron ore was investigated. Manual crushing and sieving of the iron ore in Shital Test Kits produced 5 grain size distributions namely: ≥1.0mm, 1.0mm/0.50mm, 0.50mm/0.25mm, 0.25mm/0.125mm, 0.125mm/0.00mm, from which the first and last grain sizes were excluded from the experiment on technical grounds. Then 1g of each of the remaining 3 grain sizes was carefully weighed for each set of experiment. Culturing and subsequent inoculation of the microbes (which are native to the iron ore) in conical flasks containing sterilized, weighed iron ore samples in 100ml of equally sterilized malt extract and nutrient broths were left to stand for 7 weeks in the laboratory. At weekly interval, the samples were removed, treated through series of chemical reactions to obtain ammonium phosphomolybdate precipitate which was back-titrated with 0.1 N-HCl to determine the amount of phosphorus left in samples and consequently, the amount removed. The research found out Aspergillus terreus and Bacillus subtilis have separately and successfully removed phosphorusa deleterious non-metalic inclusion from Nigeria’s Agbaja iron ore, which previously defiled all attempts at phosphorous removal and beneficiation techniques. However their ability at phosphorus removal was promising and varied with the grain sizes of ore. Across all grain sizes used, 58% and 66% phosphorus was removed in 7 weeks, respectively by the two microbes. It was also obvious that the capacity of the microbes in removing phosphorus was seriously hampered by a decline in activity as indicated by the reduction in microbial population in the microcosm. For B. subtilis the density of viable cells increased from an initial load 3.4 x 105 cfu/ml, at the beginning of experiment, to 2.2 x 107 in 2 weeks but later declined to 0.9 x 106 cfu/ml at the end of 7 weeks. For A. terreus the initial biomass weight of 1g inoculated increased to 1.993 g dry weight within 3 weeks but later decreased to 0.910g dry weight in the 7th week. The reduction in microbial activity may be attributed to antimicrobial components of the ore, pyrite, and other heavy metals which may have affected the phosphorus uptake from ore. Our findings have confirmed the stronger phosphorus removal capability of B. subtilis under submerged culture technique. It is however suggestive that A. terreus may perform optimally if the submerged medium is constantly aerated.
Phosphorus Degradation Capability of Aspergillus terreus on Nigeria’s Agbaja Iron Ore  [PDF]
C.N. Anyakwo, O.W. Obot
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1012091
Abstract: A microbial fungus - Aspergillus terreus was used to degrade phosphorus in Nigeria’s Agbaja iron ore in the laboratory. The ore was first crushed to very tiny particles, screened using Shital test kits and 1.00/0.50mm, 0.50/0.25mm and 0.25/0.125mm particle size fractions were selected for the experiment. The microbes, obtained from the nascent remains on the ore environment, were cultured, used to inoculate 1g of sterile ore samples in 250ml conical flasks containing 100ml of equally sterile malt extract broth media and left to stand. At weekly interval, the samples were removed, treated through series of chemical reactions and ammonium phospho-molybdate precipitate was obtained. This was back-titrated with 0.1 NHCl to determine the amount of phosphorus left in samples and consequently, the amount removed. Findings reveal that A. terreus is capable of degrading the ore samples. pH monitoring reveals that the P degradation process proceeded in a culture media of increasing acidity. It is recommended to further study the chemistry of the mixture of culture media, ore samples and microbes to find parameters that favour the degradation process. Key words: Ore, microbes, screening, broth, degradation, accumulation, inoculati
The Impact of Migrant Remittances on Household Welfare in Rural Nigeria
O.W. Olowa
The Social Sciences , 2013,
Abstract: Records on remittances by Central Bank of Nigeria shows an increasing trends since 2002. These huge flows of remittances are made up of millions private receiver households. The study examine the impacts of these remittances on household welfare in rural Nigeria using the Nigeria living standard statistics 2003/2004 wave by the bureau of stastistics. The result of the regression analysis revealed among other things that remittances help to reduce the effects of poverty and that remittances are counter-cyclical.
M. Schoonheim, Mixing ovaries and rosaries. Catholic religion and reproduction in the Netherlands, 1870-1970
O.W. Hoogerhuis
BMGN : Low Countries Historical Review , 2007,
Abstract:
Dutch-Asiatic Schipping (1595-1795) (http://www.inghist.nl/Onderzoek/Projecten/Das
O.W.A. Boonstra
BMGN : Low Countries Historical Review , 2004,
Abstract:
Causes and Incidence of Rape among Middle Age and Young Adult in Lagos State, Nigeria
T.O. Peters,O.W. Olowa
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2010.670.677
Abstract: The study examined the cause and incidence of rape amongst middle age and young adult in Ojodu, a border town between Lagos and Ogun states. Rape can be defined in various ways but in most jurisdiction, it is defined as sexual intercourse or other forms of sexual penetration by one person (the accused) with or against another person (the victim) without the consent of the victim. A total of 100 respondents were systematically selected for this study and with the use of simple descriptive technique analysed. The outcome revealed that there are incidences of rape within the society which many said is criminal. There are strong indications that socio-cultural factors are part of the contributing factors. It recommended among other thing that perpetrators should be punished and victims should be well supported.
Climate Change and its Effect on Agriculture in Sub-Sahara Africa
O.W. Olowa,O.A. Olowa
Environmental Research Journal , 2012, DOI: 10.3923/erj.2012.164.174
Abstract: Warming of the climate system is unequivocal as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice and rising global average sea level. The Sub-Saharan African region has all the threat signs mentioned above, located in the tropical region and made up of least developed and developing countries with heavy dependence on agriculture. Agriculture is mainly rain-fed in this region and the majority of the people, most of which are poor, depend on it for their livelihoods. The agricultural sector also accounts for a large share of GDP and export earnings. As the study shows, the region is already experiencing higher temperatures which may adversely affect crop yield and consequently, food unavailability while changes in precipitation patterns may increase the likelihood of short-run crop failures and long-run production declines. It was concluded among other things that innovative farming practices such as conservation tillage, organic production, improved cropping systems, land restoration, land use change and irrigation and water management are ways that farmers can address climate change.
Water Resources Development: Opportunities for Increased Agricultural Production in Nigeria
O.W. Olowa,B.T. Omonona
Agricultural Journal , 2013,
Abstract: Agriculture has been the backbone of the economy in Nigeria providing employment and source of livelihood for the increasing population and accounting for over half of the GDP of the Nigeria economy at independence in 1960. However, the role it plays in the regional and economic development of the country has diminished over the years. This downward trend has been attributed to many factors. The crop section has been more dependent on rain-fed and production has been seasonal (limited). With the increasing food demand in Nigeria, the country has available water resources and potential for increasing the volume of crop production towards meeting the food and nutritional requirement of the rapidly increasing population and guarantee food security in the country. The study articulates the possible effect of water resources development on increased volume of agricultural crop production in Nigeria. The study revealed that there are opportunities for water resources development in the country through irrigation to supplement the water requirements and needs of farmers for agricultural production activities in many areas in the semi-arid and arid regions. Available data shows that there are available land and water resources that could be developed to support the production of food and agricultural development with opportunity for increased productivity. However, while, the water resources are unevenly distributed in the country, there is need for the efficient use and management of the available water resources and increasing the productive use especially in the northern region of the country where there is increasing incidence of drought and competing need for water among the different sectors of the economy. The study also made possible recommendations for policy formulation to address the current problems facing the agricultural section in conjunction with the requirement for the development of the water resources.
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