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Search Results: 1 - 10 of 4692 matches for " Sonia Ebot Egbe "
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Hydrogeology of Abuja FCT-Nigeria: A GIS Evaluation  [PDF]
Richard Ayuk II Akoachere, Omogbemi Omoloju Yaya, Areakpoh Thomson Eyong, Elizabeth Orock Ayuk, Ebot Sonia Egbe
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105649
Groundwater has been recognized as playing a very important role in the development of Abuja FCT Nigeria’s capital, as many private and government establishments depend solely on wells for their water needs. Exploitation of groundwater is delicate due to its potency to contamination and difficulty to remediate aquifers. This study is to evaluate the input of the rock formations to the groundwater solute chemistry and groundwater domestic quality using hydrogeochemical tools and physicochemical parameters: pH, EC, Temperature, TDS, Chloro-alkaline indices, Ionic ratios, Gibbs diagrams, Piper diagrams, Durov diagrams and water quality index. From physicochemical parameters: pH ranged from, 4.8 - 7.9; EC, 13.4 - 1634 μS/cm; Temperature, 26℃ - 36.1℃ and TDS, 17.42 - 1094.78 mg/L. The major ions fell below WHO acceptable limits. The sequences of abundance of major ions were, K > Ca2 > Na > Mg2 for cations and Cl-> HCO3->NO3->SO42- for anions. Borehole depths range from 19.5 - 34.5 m with static water levels between 3 - 12 m.a.m.s.l. Yields were between 3.2 - 7.2 m3/Hr. Ionic ratios show ninety-five (95%) percent of the groundwater chemistry resulting from chemical weathering of rock-forming minerals through the dissolution of the host rock. The Chloro-alkaline indices: CAI1 87.23% are positive indicating exchange of Na and K from water with Mg and Ca of the rocks and 12.77% are negative, indicating reverse softening of groundwater in rocks by infiltrating rainwater while CAI2 85.11% are positive indicating exchange of Na and K from water with Mg and Ca of the rocks and 14.89% are negative, indicating reverse softening of groundwater in rocks by infiltrating rainwater. Thus chloro-alkaline indices indicate the dominance of alkaline earth elements over alkalis in majority of samples due to direct exchange of Ca2 and Mg2 from the aquifer matrix with Na and K from the groundwater. Gibbs diagram revealed groundwater ionic content was as a result of ion exchange from rock-weathering. Piper diagrams give three water types: 75% are CaHCO3, 21.20% are of MgHCO3 and 3.19% are of Na KHCO3 water types respectively. Piper diagrams also give three hydrogeochemical facies in Abuja FCT: 54.25% are of Ca-Mg-Cl-SO4, 42.56% are of Ca-Mg-HCO3 and 3.19% are of Na-K-Cl-SO4 hydrogeochemical facies respectively. Durov plot shows 20.21% are anion discriminate Ca dominant; mixed water and 63.83% had no dominant ion; simple dissolution. Water quality indices (WQI) values were between -220 - 180, Total hardness (TH) values were between 0 - 519.12. These WQI and TH values indicate that 69.2% and 47.37% of the groundwater respectively are suitable for domestic purpose. The groundwater in Abuja FCT is acidic to slightly alkaline in nature, soft to moderately hard and of low to high salinity. Major processes controlling the water quality are the weathering of the host rock through mineral dis-solution, cation exchange and inverse cation exchange processes. Ion-exchange, simple dissolution and uncommon dissolution processes determined groundwater character.
Geogenic Imprint on Groundwater and Its Quality in Parts of the Mamfe Basin, Manyu Division, Cameroon  [PDF]
Richard Ayuk II Akoachere, Thomson Areapkoh Eyong, Sonia Ebot Egbe, Regina Engome Wotany, Michael Obiekwe Nwude, Omagbemi Omoloju Yaya
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.75016
Groundwater studies in parts of the Mamfe basin are sparse and the Mamfe area has the highest population density in the Mamfe basin. An in-depth study of groundwater rock interaction and groundwater quality is of vital importance. This same part of the basin is the economic centre and as such development of businesses in this area requires knowledge of the groundwater quality. Therefore, this study was undertaken to determine the input of the rock formations on the groundwater solute chemistry and groundwater domestic-agro-industrial quality using hydrogeochemical tools and physicochemical parameters: Ionic ratios, Gibbs diagrams, Piper diagrams, Durov diagrams and water quality indices. From physicochemical parameters, in the rainy season, pH ranged from, 4.3 - 8.6; EC, 3 - 1348 μS/cm; Temperature, 24.4 - 30.1
GIS-Hydrogeochemical Model of the Yaoundé Fractured Rock Aquifer, Cameroon: Aquifer Setting, Seasonal Variations in Groundwater-Rock Interaction and Water Quality  [PDF]
Richard Ayuk II Akoachere, Omabgemi Omoloju Yaya, Sonia Ebot Egbe, Thomson Areakpoh Eyong, Bihmimihney Nelly Nji, Diana Besem Tambe
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.75018
This study of the gneiss-fractured-rock aquifer in Yaoundé capital of Cameroon determines: the aquifer setting-flow systems, the aquifer type, seasonal variations in rock-water interactions, evolution of the hydrogeochemical processes, physicochemical parameters and the suitability for domestic-agro-industrial use of the groundwater. Physicochemical field tests were carried out on 445 wells during four seasons for EC, pH, TDS, Temperature and static water level from July 2016 to May 2017. 90 well samples were analyzed 45 samples per season: wet/dry. 38 borewell logs were used together with structural data to determine the aquifer setting. The field physico-chemical and laboratory analysis data of well samples were mounted unto various GIS software platforms: Global mapper, AqQa, Aquachem, Rockworks, Logplot7, Surfer and ArcGIS, to get indices/parameters/figures, by use of Durov’s, Piper’s and Gibbs diagrams, Water quality index WQI, USSL ratio, Sodium Absorption ratio SAR, Percent sodium %Na, Kelly Ratio KR, Magnesium Absorption Ratio MAR, Total Hardness TH, Residual Sodium Carbonate RSC and Permeability Index PI that were determined. The process of groundwater ions acquisition is three-fold: by recharge through atmospheric precipitation, by ion exchange/simple dissolution between the rock-groundwater and by groundwater mixing in its flow path. Water types are Ca-HCO3, Mg-HCO3 and Mg-Cl while hydrogeochemical facies are Ca-Mg-HCO3 and Ca-Mg-Cl-SO4. Most water samples are
Seasonal Variations in Groundwater of the Phreatic Aquiferous Formations in Douala City-Cameroon: Hydrogeochemistry and Water Quality  [PDF]
Richard Ayuk Akoachere, Sonia Ebot Egbe, Thomson Areapkoh Eyong, Sophie Ngomune Edimo, Simon Ngomba Longonje, Diana Besem Tambe, Nji Bihmimihney Nelly
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105328
This study was to determine the seasonal variations of groundwater, the influence of the rock formations on the groundwater solute chemistry and groundwater domestic-agro-industrial quality using hydrogeochemical tools and physicochemical parameters; Ionic ratios, Gibbs diagrams, Piper diagrams, Durov diagrams and water quality indices. From physicochemical parameters; in the rainy season, pH ranged from, 4.6-7.1; EC, 0.023-1.63 mS/cm; Temperature, 26.3-290C andTDS, 0.015-1.09 mg/L and in the dry season pH ranged from 5-7.2; EC, 0.01-1.61 mS/cm; Temperature, 24.4-29.50C andTDS, 0.01-1.08 mg/L. Forty groundwater samples; 20 per season, wet and dry were analysed. Themajor ions fell below WHO acceptable limits for both seasons. The sequences of abundance of major ions were, Ca2 >K >Mg2 >NH4 >Na , HCO3->Cl->SO42->NO3->HPO42- in wet season and Ca2 >Mg2 >K >Na >NH4 , HCO3->Cl->SO42->HPO42->NO3- in dry season. Ion-exchange, simple dissolution and uncommon dissolution processes determined groundwater character. Groundwater ionic content was as a result of ion exchange from rock-weathering. Water types are; MgCl and MgHCO3 in both seasons. Hydrogeochemical facies are; Ca-Mg-Cl-SO4, characteristic of groundwater some distance along its flow path and Ca-Mg-HCO3, characteristic of freshly recharged groundwater from precipitation. The groundwater indices of; Sodium Percent (% Na), Residual Sodium Carbonate (RSC) , Kelley’s ratio (KR), Sodium Adsorption Ratio (SAR), Electrical Conductivity (EC), Total Dissolved Solid (TDS), USSL? and Wilcox index were determined, evaluated and found to be suitable for agro-industrial uses in all seasons. Permeability Index (PI) , Water quality index (WQI) and Magnesium Adsorption Ratio (MAR) were not suitable in some areas and in some seasons.
Managing Macular Holes in a Developing Economy  [PDF]
Bassey Fiebai, Chinyere N. Pedro-Egbe
Open Journal of Ophthalmology (OJOph) , 2015, DOI: 10.4236/ojoph.2015.53021
Abstract: Background: Macular holes are the common cause of visual impairment especially in the elderly and have a variety of etiological factors. The advances in the management of macular holes are encouraging and are now available in developing countries although scarce, where hitherto; patients seek attention outside their country. The need to understand this disease has therefore become pertinent in all retina clinics. Objective: To evaluate the pattern of presentation of macular holes and its management in a retina clinic in South South Nigeria. Methods: A 5 year retrospective, non comparative review of 24 consecutive cases presenting to a retinal clinic was carried out. Relevant information was extracted from the medical records and analyzed. Results: Three hundred and sixty four cases were seen between January 2009 and December 2013. Twenty four cases had macular holes and ten (41.7%) had bilateral presentation with a total of 34 eyes. The incidence of macular holes was 6.6%. The mean age was 46 years (SD ± 13.42) with a female preponderance, 5:1. Idiopathic holes formed the bulk of the cases 14(58.3%); others were trauma 4(16.7%), posterior uveitis 2, (8.3%), chemotherapy 2 (8.3%), Solar retinopathy and retinitis pigmentosa 1 (4.2%). Nineteen (55.9%) of the 34 eyes were visually impaired (BCVA <6/18). Nineteen eyes had full thickness holes (55.9%) requiring surgery, however only 3(12.5%) of these could afford to have surgery with one reoperation. Four patients (16.7%) had complications in form of retinal detachments at presentation. Conclusion: This study has shown that the incidence of macular holes in the developing world is significant and resources to manage these cases are grossly lacking. Specialist training, with government subsidizing costs will alleviate these difficulties and reduce visual loss from macular holes.
Optimization of Pension Asset Portfolio in Nigeria with Contributors’ Specified Return Rate  [PDF]
Bright O. Osu, Godswill A. Egbe
Open Journal of Optimization (OJOp) , 2016, DOI: 10.4236/ojop.2016.54012
Abstract: This work focuses on the optimization of investment contributions of pension asset with a view to improving contributors’ participation in achieving better return on investment (RoI) of their funds. We viewed some new regulations on Nigeria’s Contributory Pension Scheme” (CPS) from amended legislation of 2014, some of which are yet to be implemented when their regulations are approved. A mathematical model involving 5 variables, 5 inequality constraints covering regulatory limitations and limitation on scarce resource known as Asset Under Management (AUM), suggested and mathematically shown to be possible through “maximization of return irrespective of risk” while obeying all regulatory controls as our constraints optimized. Optimized portfolio using MatLab shows that the portfolio representing AES 2013 portfolio with a deficit growth of \"\"15.75 m representing 3.27% less than the portfolio’s full growth potential within defined assumptions would have been averted if contributors actually set their targets and investment managers optimize from forecasts of future prices using trend analysis.
Watershed Degradation in the Bamendjin Area of the North West Region of Cameroon and Its Implication for Development
Sunday Shende Kometa,Mathias Ashu Tambe Ebot
Journal of Sustainable Development , 2012, DOI: 10.5539/jsd.v5n9p75
Abstract: It is indeed a paradox that even with favourable natural endowments such as fertile soils and abundant surface water resources, some rural communities and regions still reflect major levels of poverty, food insufficiency, limited water supplies and water-related health problems. To ensure stability in food production and sustain food sufficiency in areas where local economies entirely depend on farming and the natural state of the environment, it is important to investigate the indications and implications of environmental degradation. Through the application of relevant field methods for data acquisition and analyses, the paper examines and proposes recommendation where ….. of the degradation of the Bamendjin Catchment area, which is located within the fertile volcanic province of the North West Region of Cameroon. The results reveal that poor land use have ushered in profound degradation of this watershed. This paper also provides the tools needed to improve on the perception and attitude of the inhabitants towards the exploitation of this watershed and their local environment in general.
Visual outcome following optic neuritis: A 5 year review
CN Pedro Egbe
Nigerian Journal of Clinical Practice , 2012,
Abstract: Background: Optic neuritis is a demyelinating inflammatory disease of the optic nerve that typically affects young adults especially females, and is usually associated with multiple sclerosis especially in Caucasians. The prognosis for visual recovery is usually good but with poor quality. Objective: The objective was to determine the level of improvement of vision after an attack of optic neuritis in Port Harcourt, Nigeria. Design: A retrospective hospital based study was performed. Setting: Eye Clinic, University of Port Harcourt Teaching Hospital (UPTH), Port Harcourt, Nigeria. Data Extraction: Medical records of all cases of optic neuritis seen at the Eye Clinic of UPTH over a 5 year period (January 2006–December 2010) were retrieved and relevant data including age, sex, presenting symptom, and visual acuity (VA) were extracted. The VA at discharge 12 weeks later was noted. Our diagnosis of optic neuritis was based on the presence of low vision, dyschromatopsia, and peri ocular pain. Results: Over 24,000 patients were seen during this period, and 27 cases were optic neuritis (0.1%). Of the 27 cases of optic neuritis, 20 cases were retro bulbar neuritis (74.1%), while seven (25.9%) were papillitis. There were 16 females and 11 males giving a female to male ratio of 3:2. Most cases (75%) at presentation had VAs<6/24. By the 12th week, most visual acuities (77.1%) had improved to 6/12 or better. Conclusion: This study confirms widely documented evidence that there is improvement in visual acuity after an attack of optic neuritis. Even though the risk of developing multiple sclerosis following optic neuritis is said to be low in blacks, these patients should still be followed up for sometime especially as some may go on to develop other complications of demyelination.
Antibiotics Resistance Pattern and Plasmid Profiling of Edwardsiella tarda Isolated from Heterobranchus longifilis  [PDF]
F. C. Ogbonne, E. R. Ukazu, F. C. Egbe
Journal of Biosciences and Medicines (JBM) , 2018, DOI: 10.4236/jbm.2018.64008
Abstract: A study was carried out to investigate antibiotic resistance patterns and plasmid profiling of Edwardsiella tarda isolated from farmed-cultured Heterobranchus longifilis in Lagos State, Southwest of Nigeria. A total of 44 Edwardsiella isolates were recovered from 80 fish samples collected from the 10 fish farms using selective random stratification. It was observed that Edwardsiella tarda isolates were 100% resistant to Amoxicillin, Chloranphenicol, Levofloxacin, Streptomycin and 90% resistant to Nalidixic Acid respectively. All the isolates were 100% susceptible to Spectinomycin and Ciprofloxacin, while Ofloxacin, Gentamycin, and Pefloxacin vary in their level of susceptibility with 90%, 80% and 70% sensitivity respectively. Conversely, 8 out of 10 fish farm locations studied were observed to have antibiotic-resistant strains, and 5 out of 8 drug-resistant strains were found to carry plasmid and the sizes of the plasmid ranges between 20.027 kb to 23.130 kb. The plasmid after treatment with mitomycin C and ethidium bromide were lost during the process of plasmid curing confirming that the multiple drug resistant exhibited by the isolates was plasmid mediated. There are fewer studies on antibiotic resistance in Edwardsiella tarda from aquaculture enterprises and this study provides further support to the view that there is a potential risk of transfer of resistant bacteria and their genes to human pathogen through the food chain. Although, in Nigeria there is no antibiotic product registered for aquaculture usage, yet fish farmers use them off-label for bacterial diseases prevention.
Investigation of the image quality of plain abdominal radiographs in three Nigerian hospitals
NO Egbe,DU Eduwen,VC Ikamaise
Biomedical Imaging and Intervention Journal , 2007, DOI: 10.2349/biij.3.4.e39
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