https://journals.ui.edu.ng/index.php/jsr/issue/feedJOURNAL OF SCIENCE RESEARCH2021-07-15T07:42:10+00:00Open Journal Systems<p>Journal of Science Research is a refereed journal intended primarily as a medium for reporting original researches of theoretical and experimental origin in Science; although reviews of topical issues will also be accepted</p>https://journals.ui.edu.ng/index.php/jsr/article/view/541A comparative analysis of the binding site of Plasmodium falciparum histone deacetylase-1 and human histone deacetylase-82021-07-12T07:56:11+00:00Odozi, N, W.nw.odozi@ui.edu.ng<p>Histone deacetylases (HDACs) are a family of enzymes involved in the modulation of mammalian cell chromatin structure,<br>regulation of gene expression, DNA repair, and stress response. The histone deacetylase enzymes Plasmodium falciparum<br>histone deacetylase-1 (PfHDAC-1) and human histone deacetylase-8(hHDAC 8) have been identified as novel targets for<br>development of antimalarial and antitumor drugs respectively. Homology models of PfHDAC-1 and hHDAC 8 were<br>generated from the crystal structures of HDAC8 and HDLP and IT64 respectively using a restraint guided optimization<br>procedure involving a combination of the Optimized Potentials for Liquid Simulations and the Generalized Born Surface<br>Area (OPLS/GBSA) potential setup. The models were validated using protein structure validation tools. Comparative<br>analysis of their binding sites was also carried out to identify their topology and residue interaction that could be utilized<br>in developing PfHDAC-1 specific inhibitors.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/562Effects of crude oil contaminated-soil on the germination and growth of cowpea Vigna unguiculata (L.) Walp2021-07-12T10:18:15+00:00Odiwe, A. I.aiodiwe@oauife.edu.ngRaimi, I. O.aiodiwe@oauife.edu.ngEnajeria, G.,aiodiwe@oauife.edu.ng<p>A greenhouse experiment was conducted to investigate the germination and growth response of cowpea (Vigna unguiculata<br>(L.) Walp) to soils contaminated at different concentrations of crude oil. This was done with a view to access the impact<br>of crude oil pollution on growth and nutrient content after harvest. The contaminated crude oil polluted soils were<br>prepared at different concentrations of 0.0, 10.0, 20.0, 30.0, 40.0 and 50.0 (w/v) on 5 kg each of air-dried soil collected from<br>the Obafemi Awolowo University Biological Garden rich in organic matter. Each treatment was replicated three times and<br>arranged in complete randomized design. The following parameters, leaf length, breadth and leaf number, N and protein<br>were determined. Results showed that leaf length, breadth and leaf number were significantly higher (p<0.05) recorded in<br>the control pots. The least % N and protein were recorded in the pots with highest crude oil concentration (50.0 ml). The<br>results also showed that increasing crude oil concentration, posed higher risk of edibility of the test-plant and no<br>detectable amount of petroleum hydrocarbon was found in the soils at the end of the experiment. The study concluded<br>that although cowpea germinated and grew well in crude oil-contaminated soils, its nutrient content was impaired and<br>edibility not guaranteed.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/530Air and heavy metal pollution around a steel foundry in Ogijo, Ogun State, Nigeria2021-07-09T11:51:16+00:00Olayinka*, O. O.fummy2favour@yahoo.com.phAdedeji, O. H.Adedej@gmail.comBalogun, Y.ummy2favour@yahoo.com.ph<p>A whole range of bye-products from industries such as steel plants and metal processing facilities create serious pollution<br>to the environment, with negative health implications. In this study, we examined environmental pollution around African<br>Steel Foundry in Ogun State, Nigeria. Air sampling was carried out using Land Duo Multi gas monitor to determine air<br>pollutants such as Total Suspended Particulate Matter (TSP), Carbon monoxide (CO), Carbon dioxide (CO2), Nitrous oxide<br>(NO), Nitrous oxide and Nitrogen dioxide (NOx), Hydrogen sulphide (H2S) and Sulphur dioxide (SO2). Thirty soil and plant<br>samples were collected from Steel Foundry. Concentrations of selected heavy metals (Fe, Cu, Cd, Ni and Pb) were<br>determined in both soil and plant (cassava, pawpaw and maize leaves) samples using an Atomic Absorption Spectroscopy<br>(AAS). The results show that total suspended particulate matter (TSP) ranged from 123.46 ?gm–3-353.74 ?gm–3, while CO,<br>CO2, NO, NOx, H2S, and SO2 ranged from 3.20-13.33 ppm, 3.55-5.04 ppm, 1.36-5.69 ppm, 2.02- 8.50 ppm, 0.96-1.93 ppm and<br>1.63-3.96 ppm respectively. Some of these values exceeded the USEPA guideline limit of clean air. Mean concentrations of<br>Fe, Cu, Cd, Pb and Ni found in the plants and soils were below WHO guideline limit of heavy metals. The results revealed<br>the high concentration TSP, NO, and SO2 which may lead to health risk after long time of exposure and also accumulation<br>of these metals overtime may lead to contamination of the agricultural soils which eventually pose threat to organisms that<br>feed on the plants.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/559Effects of crude oil contaminated-soil on the germination and growth of cowpea Vigna unguiculata (L.) Walp2021-07-12T10:06:05+00:00Enajeria G.enajeria.j@oauife.edu.ngRaimi I. O.raimi.o.i@oauife.edu.ngOdiwe A. I.aiodiwe@oauife.edu.ng<p>A greenhouse experiment was conducted to investigate the germination and growth response of cowpea (Vigna unguiculata<br>(L.) Walp) to soils contaminated at different concentrations of crude oil. This was done with a view to access the impact<br>of crude oil pollution on growth and nutrient content after harvest. The contaminated crude oil polluted soils were<br>prepared at different concentrations of 0.0, 10.0, 20.0, 30.0, 40.0 and 50.0 (w/v) on 5 kg each of air-dried soil collected from<br>the Obafemi Awolowo University Biological Garden rich in organic matter. Each treatment was replicated three times and<br>arranged in complete randomized design. The following parameters, leaf length, breadth and leaf number, N and protein<br>were determined. Results showed that leaf length, breadth and leaf number were significantly higher (p<0.05) recorded in<br>the control pots. The least % N and protein were recorded in the pots with highest crude oil concentration (50.0 ml). The<br>results also showed that increasing crude oil concentration, posed higher risk of edibility of the test-plant and no<br>detectable amount of petroleum hydrocarbon was found in the soils at the end of the experiment. The study concluded<br>that although cowpea germinated and grew well in crude oil-contaminated soils, its nutrient content was impaired and<br>edibility not guaranteed.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/557Structural equation modelling of academic performance in statistics degree programme: A case study of University of Ibadan2021-07-12T09:52:28+00:00Olubusoye O. E.busoye2001@yahoo.comAdejumo N. A.nasiratade@yahoo.com<p>This paper is concerned with the structural equation modelling of the academic performance in Statistics degree programme.<br>Structural equation modelling is a class of methodologies that represent hypotheses about variances and covariances of<br>observed data in terms of structural parameters defined by a theoretical model. It takes a confirmatory approach to the<br>multivariate analysis of structural theory which specified the causal relations among the multiple observed variables. The<br>causal pattern of intervariable relations within the theory was specified a priori. Structural equation modelling evaluated<br>two models – the measurement model and the structural model. The measurement model related observed responses or<br>indicators to latent variables (confirmatory factor analysis), while the structural model specified relations among latent<br>variables (path analysis). The direct and indirect effects of personal factor, psychological factor, institutional/environmental<br>factor, family characteristics, social and religious factor on the academic performance of students were studied. The<br>academic performance of students remains a top priority for students, parents, educators, researchers, administrators<br>(management) and government. The extent to which the theoretical model is supported by sample data collected from<br>undergraduate students of the Department of Statistics, University of Ibadan, was determined. There were 37 observed<br>variables and 7 latent variables. The result indicated that the attitude of students towards learning had positive direct<br>impact on academic performance, while psychological factor had negative influence on academic performance. Also, the<br>structural equation model analysis with four basic fit indices suggested a reasonable model-data fit.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/551Computational studies of the corrosion inhibition potentials of some derivatives of 1H-Imidazo [4, 5-F] [1, 10] phenanthroline2021-07-12T09:16:32+00:00Obi-Egbedi, N. O.dammynath@yahoo.comOjo, N. D.dammynath@yahoo.com<p>Computational simulations of the corrosion inhibition potentials of four imidazophenanthroline derivatives were carried<br>out using Density Functional Theory (DFT) with B3LYP/6-31G* method. It was shown that the predictive corrosion<br>inhibition potentials increase in the order 2-methyl-1H-imidazo[4,5-f][1,10]phenanthroline (MIP) < 3-(1H-imidazo [4, 5-f][1,<br>10] phenanthrolin-2-yl) phenol (IPP) <2-(2-methoxyphenyl)-1H-imidazo [4, 5-f] [1, 10] phenanthroline (MPIP) < 4-methoxy-<br>2-(3H-phenanthro [9, 10-d] imidazol-2-yl) phenol (MPP). The anticorrosion potentials were predicted using the quantum<br>chemical parameters like energy gap (?E), energy of highest occupied molecular orbital (EHOMO), energy of lowest unoccupied<br>molecular orbital (ELUMO), ionization potential (I), electron affinity (A), polarizability (?), global hardness (?), global softness<br>(), electronegativity (x) and polar surface area (PSA). Corrosion inhibition potentials increase with increasing EHOMO,<br>polarizability, global softness and polar surface area (PSA), and decreasing energy gap (?E), ELUMO and global hardness.<br>Also, the sites of likely electrophilic attack were located on nitrogen and oxygen atoms as shown by high negative<br>Mulliken charges of these atoms. This implied that the metal surface atoms could be bonded to these inhibitors through<br>nitrogen and oxygen atoms. From the results, 4-methoxy-2-(3H-phenanthro [9, 10-d] imidazol-2-yl) phenol (MPP) showed<br>the highest EHOMO, polarizability, PSA, and the lowest ?E, ELUMO, hence the greatest potential of inhibiting corrosion of<br>metals in aqueous solutions.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/549Subsistence of four bacteria isolated from Nigerian aquaculture farms on oxytetracyclineor2021-07-12T09:05:32+00:00Adelowo O. O.oo.adelowo@ui.edu.ngLawal O. E.o.e.lawal@ui.edu.ngAdekanmbi A. O.adekanmbi.ao@gmail.com<p>The ability of 147 oxytetracycline (OTC)-resistant bacteria isolated from aquaculture ponds in Ibadan, Nigeria, to subsist<br>on OTC as a source of nutrient for growth was investigated in this study. Four bacteria identified by 16S rDNA sequencing<br>as Bacillus pumilus Aa8, Bacillus pumilus Ab11, Stenotrophomonas maltophilia Ng7 and Klebsiella pneumoniae Nf6<br>utilised 4.8, 13.1, 16.5 and 19.0 % of the OTC supplied in the growth medium in 72 hours with degradation rates of 8.0, 21.8,<br>27.5 and 31.7 ?g/day respectively. The results showed that bacteria capable of subsisting on tetracycline (TET) antibiotics<br>are present in the environment. However, the risk of possible transfer of resistance determinants to other environmental<br>bacteria by these strains is a disincentive to their use in the clean-up of antibiotic contaminated ecosystems.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/567Isolation and identification of thermophilic cellulolytic yeast from cassava waste dump2021-07-12T10:32:41+00:00Onilude A. A.Onilude.aa@yahoo.comAdekoya A.O.Adekoya.o@gmail.comWakil S. M.shemowak@yahoo.comFasiku S. A.sa.Fasiku@gmail.comfJa’afaru, I. Mim.jaafaru@yahoo.co.uk<p>Cellulase is an enzyme complex which breaks down cellulose to glucose. The need for economical, complete and fast<br>industrial processes necessitates the use of very active starters able to operate at high temperature of production to<br>degrade cheap nutrients most of which are cellulolytic; hence the search for thermophilic cellulolytic yeasts from the<br>environment. Isolation and identification of thermophilic yeasts were made from the soil samples using standard procedures<br>and obtained isolates were screened for cellulolytic enzymes production. The enzymes were characterised using different<br>parameters such as temperature, pH, substrate concentrations, enzyme concentrations and metal ion concentrations. A<br>total of seven thermophilic yeasts were isolated from cassava waste dump sites and identified as Torulopis sphaerica,<br>Kloeckera apiculata, Pichia canadensis, Pichia species, Candida krusei, Candida utilis and Rodotorula rubra. They<br>all had optimum growth at temperature and pH of 55ºC and 6.0 respectively. The optimum temperature and pH for<br>cellulolytic activities ranged from 45-55ºC and 5-6 respectively. Cellulolytic activities increased with increase in the<br>concentration of substrate, enzymes and metal ions.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/546Determination of the pKa values of some selected aromatic amines and naturally occurring compounds in polar and non-polar solvents at 25oC2021-07-12T08:41:29+00:00Eugene-Osoikhiakemitunmise@yahoo.co.ukTaiwo, O. T.kemitunmise@yahoo.co.ukAdegbemigun, A.kemitunmise@yahoo.co.uk<p>Ionisation constant is a measure of the strength of acids and bases and is expressed in terms of the pKa of conjugate acids<br>and bases. The pKa of naturally occurring khivorin, 7-keto-khivorin and some aromatic amines were measured in chloroform,<br>toluene, 50% ethanol-methanol, 50% ethanol-water and 75% ethanol-methanol mixture at 25oC by potentiometric titration.<br>The pKa values obtained are 3.23 for khivorin in toluene and 1.20 for 7-ketokhivorin in chloroform which demonstrate their<br>acidic nature. The aromatic amines: indole and 4-dimethylaminopyridine have a higher pKa values in 50% ethanol-water<br>solvent compared to their values in ethanol-methanol solvents. 3-methylindole and para-toluidine have a higher pKa<br>values in 50% and 75% ethanol-methanol solvents than in ethanol-water solvent. The higher pKa values of indole and 4-<br>diemthylaminopyridine in 50% ethanol-water signifies the best medium at which the strength of these amines could be<br>determined; whereas p-toluidine is best determined in 50% ethanol-methanol and 3-methylindole in 75% ethanol-methanol<br>mixture.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/563Bioremediation of spent diesel oil contaminated-soil by Pleurotus ostreatus (Jacq. Fr) P. Kumm2021-07-12T10:19:26+00:00Onakpharkpote E. E.Onakpharkpote.ee@gmail.comAdenipekun C. D.clementinaadenipekun@gmail.comOyetunji O. J.Oyetunji.oj@gmail.com<p>Soil contamination with petroleum products has gained much attention globally in the last decade owing to their toxic<br>effects on the ecosystem. Remediation of such contaminated-soil before crop cultivation becomes imperative. In this<br>study, the potential of Pleurotus ostreatus to biodegrade spent diesel oil contaminated-soil for a period of two months<br>was investigated. Four kilogram of top soil was contaminated with varying compositions (5, 10 and 15% w/v) of spent<br>diesel oil was inoculated with 50 g of P. ostreatus, incubated at 28 ? 2oC in triplicates and analyzed for some physico-<br>chemical parameters before and after incubation. The overall effect of the fungus on spent diesel oil contaminated-soil and<br>straw levels showed that the highest nutrient content was at 15% contamination level with 10.8%, 17.59%, 1.12%, 1.14<br>cmol/kg, 8.88 cmol/kg and 1.78 cmol/kg respectively for organic carbon, organic matter, total nitrogen, potassium, calcium<br>and magnesium contents except for phosphorus with the highest value of 18.12 mg/kg observed at 5% contamination<br>level. Also, 15% spent diesel oil contaminated-soil had the highest overall heavy metal reduction with 8.45, 7.43, 5.79,<br>42.81, 5.78 and 3.18 mg/kg respectively for Cd, Cr, Ni, Pb, Cu and Zn. At each incubation period, the pH of each contaminated-<br>soil ranged from 7 to 8. This improvement of soil nutrient content as well as reduction in the heavy metal contents of the<br>soil could be an indication of degradation of organic and inorganic contaminants by P. ostreatus.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/543Air and heavy metal pollution around a steel foundry in Ogijo, Ogun State, Nigeria2021-07-12T08:19:58+00:00Olayinka O. O.fummy2favour@yahoo.com.phAdedeji O. H.adeniji.oh@gmail.comBalogun Y.balogun.y@yahoo.com<p>A whole range of bye-products from industries such as steel plants and metal processing facilities create serious pollution<br>to the environment, with negative health implications. In this study, we examined environmental pollution around African<br>Steel Foundry in Ogun State, Nigeria. Air sampling was carried out using Land Duo Multi gas monitor to determine air<br>pollutants such as Total Suspended Particulate Matter (TSP), Carbon monoxide (CO), Carbon dioxide (CO2), Nitrous oxide<br>(NO), Nitrous oxide and Nitrogen dioxide (NOx), Hydrogen sulphide (H2S) and Sulphur dioxide (SO2). Thirty soil and plant<br>samples were collected from Steel Foundry. Concentrations of selected heavy metals (Fe, Cu, Cd, Ni and Pb) were<br>determined in both soil and plant (cassava, pawpaw and maize leaves) samples using an Atomic Absorption Spectroscopy<br>(AAS). The results show that total suspended particulate matter (TSP) ranged from 123.46 ?gm–3-353.74 ?gm–3, while CO,<br>CO2, NO, NOx, H2S, and SO2 ranged from 3.20-13.33 ppm, 3.55-5.04 ppm, 1.36-5.69 ppm, 2.02- 8.50 ppm, 0.96-1.93 ppm and<br>1.63-3.96 ppm respectively. Some of these values exceeded the USEPA guideline limit of clean air. Mean concentrations of<br>Fe, Cu, Cd, Pb and Ni found in the plants and soils were below WHO guideline limit of heavy metals. The results revealed<br>the high concentration TSP, NO, and SO2 which may lead to health risk after long time of exposure and also accumulation<br>of these metals overtime may lead to contamination of the agricultural soils which eventually pose threat to organisms that<br>feed on the plants.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/561Facies model building of integrated multiscale data in Dn-Field, Onshore, Niger Delta, Nigeria2021-07-12T10:10:45+00:00Nton M. E.ntonme@yahoo.comArigbe O. D.doarigbe@gmail.com<p>This study employs 3D Post-Stack Time-Migrated seismic data from the DN-Field, within the Coastal Swamp depobelt of<br>the Niger Delta in predicting lithofacies and fluvial facies of OVK-1 sand bodies in the Agbada Formation, as a tool to<br>identify new drillable prospects. A lithofacies model for OVK-1 reservoir sand body was generated after upscaling using<br>Most Of, as the averaging method. Calibrated by fluvio-facies at the well locations, channel sands were identified in OVK-<br>1 reservoir interval using Stochastic Sequential Indication Simulation (SSIS) algorithm. Based on lithofacies, fluvial facies<br>and biofacies analyses, a terrigenous and shallow fluvio-deltaic fill within a lowstand system tract was evident. Petrophysical<br>properties including porosity, volume of shale and effective porosity were upscaled, guided by facies model and then<br>Stochastic Gaussian Simulation (SGS) algorithm was used to produce the model. Porosity model predicted sand layers<br>having maximum porosity of 27.5% which implied very good reservoir potential. However, the volume of shale model with<br>values from 0.45 to 0.50 incorporates silt and clay and indicates marginal reservoir potential. The study identifies four<br>potential reservoir intervals with thickness ranging from 9.1 to 38.5 m. The effective porosity in OVK-1 ranges from 0.10 to<br>0.30 and identified fluvial facies such as floodplain, channel sand, levee and crevasse splay sand. Facies model show a<br>good sand distribution with minor shale localized in the western part of the Field. The central part of the model has good<br>reservoir qualities, evident by low volume of shale values and high porosities. This study helps to identify a potential<br>unexplored drillable prospect on OVK-1 sand body south-west of DN-2 well. Successful drilling of the identified prospect<br>could increase the reserve of the Field.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/558Depositional environment and reservoir quality appraisal of offshore 'K-Field', Niger Delta, Nigeria2021-07-12T09:58:54+00:00Boboye O.A.oa.boboye@mail.ui.edu.ngAkinsebikan O. A.samtack77@yahoo.co.uk<p>This study attempts to evaluate the hydrocarbon reservoir and depositional trend of ‘K- Field’ via suites of wireline logs.<br>This is to identify, correlate the sand bodies and evaluate their petrophysical attributes with a view of understanding their<br>variation as itaffects the reservoir, hydrocarbon prospect and productivity in the field, and to determine the<br>palaeoenvironment of the lithofacies. Six sand bodies were identified and correlated across three wells. Zones of sand<br>level with water saturation < 0.50 were the hydrocarbon bearing. The various hydrocarbon reservoirs determined are six<br>(W-7), four (W-2) and three (W-11) respectively. The average petrophysical properties of the reservoirs range from 19% to<br>25%, 54.84 md to 1159.90 md, 20% to 42% and 58% to 80% for porosity, permeability, water saturation and hydrocarbon<br>saturation respectively. The porosity and permeability range from good to excellent. The identified reservoirs show high<br>movable oil saturation (MOS), low residual oil saturation (ROS) and favourable values of movable hydrocarbon index (Sw/<br>Sxo< 0.7). The field has both oil and gas hydrocarbon with the Gas Oil Contact (GOC), Oil-Water-Contact (OWC), Oil-<br>Down-To (ODT) and Gas-Down-To (GDT) contact types. The cross plot of water saturation and porosity revealed that the<br>grain sizes of the sand bodies range from coarse to very fine. Bulk Volume Water (BVW) cross plot indicated that most of<br>the reservoirs are heterogeneous and not at irreducible water saturation. The log facies recognized suggest a palaeo-<br>depositional environment of basin plain, crevasse splay, prograding and transgressive marine shelves.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/553Effect of inositol hexakisphosphate on sulphydryl reactivities of low (cat) and high (human) oxygen affinity haemoglobins2021-07-12T09:26:55+00:00Okonjo, K. O.am.olatunde@ui.edu.ngBabalola, J. O.abimbolatunde1@yahoo.comOlatunde, A. M.,abimbolatunde1@yahoo.com<p>The effect of organic phosphate binding on the reactivities of low-affinity cat haemoglobin in comparison to high-affinity<br>human haemoglobin was determined. Kinetics of the reaction of the CysF9[93]? sulphydryl groups in both haemoglobins<br>with 5,5?-dithiobis(2-nitrobenzoate) – DTNB – which has been linked to oxygen binding, was used to probe this effect.<br>Plots of the pseudo-first order rate constant, kobs, as a function of the DTNB concentration were linear and had positive<br>intercepts. This is indicative of the fact that the organic phosphate used, inositol hexakisphosphate (inositol-P6), does not<br>abolish reversibility in both haemoglobins. Cat haemoglobins gave simple pH-dependence profiles for the apparent<br>second order forward rate constants, kF. The presence of inositol-P6 increased kF, hence reactivity, by two-fold throughout<br>the experimental pH range for cat oxyhaemoglobin. In contrast, inositol-P6 decreased kF for human oxyhaemoglobin.<br>Around the physiological pH, kF decreased from a maximum value of 31.9 ? 0.6 mol-1dm3s-1 to 26.7 ? 0.3 mol-1dm3s-1 for<br>human haemoglobin, while it increased from a minimum of 17.2 ? 0.4 mol-1dm3s-1 to 20.6 ? 0.6 mol-1dm3s-1 for cat minor<br>oxyhaemoglobin.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/548Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics2021-07-12T09:05:53+00:00Ayedogbon, A. S.helenalabie3@yahoo.comAwoyemi, R. F.helenalabie3@yahoo.comAlabi, A. Hhelenalabie3@yahoo.com<p>Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.<br>Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorption<br>capacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueous<br>solution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reacted<br>with citric acid according to the method in the literature. Batch adsorption studies were conducted to examine the<br>influence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,<br>Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich<br>models were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomic<br>absorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed that<br>sorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell<br>(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order of<br>Pb2+ > Cu2+> Cd2+. The amount of Pb2+ adsorbed increased from 4.62-33.56 mg/g after modification as shown by values<br>obtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2 values which shows that it<br>satisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ ions on UCPS and MCPS. The kinetics of the<br>sorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parameters<br>showed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. The<br>process is exothermic for Cu2+ and Cd2+ ions; but endothermic for Pb2+. This study has shown that citric acid modified<br>cocoa pod shell is a good biosorbent especially for Pb2+ ions</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/569Bioremediation of spent diesel oil contaminated-soil by Pleurotus ostreatus (Jacq. Fr) P. Kumm2021-07-12T10:40:01+00:00Oyetunji, O. J.clementinaadenipekun@gmail.comAdenipekun, C. D.clementinaadenipekun@gmail.comOnakpharkpote, E. E.,clementinaadenipekun@gmail.com<p>Soil contamination with petroleum products has gained much attention globally in the last decade owing to their toxic<br>effects on the ecosystem. Remediation of such contaminated-soil before crop cultivation becomes imperative. In this<br>study, the potential of Pleurotus ostreatus to biodegrade spent diesel oil contaminated-soil for a period of two months<br>was investigated. Four kilogram of top soil was contaminated with varying compositions (5, 10 and 15% w/v) of spent<br>diesel oil was inoculated with 50 g of P. ostreatus, incubated at 28 ? 2oC in triplicates and analyzed for some physico-<br>chemical parameters before and after incubation. The overall effect of the fungus on spent diesel oil contaminated-soil and<br>straw levels showed that the highest nutrient content was at 15% contamination level with 10.8%, 17.59%, 1.12%, 1.14<br>cmol/kg, 8.88 cmol/kg and 1.78 cmol/kg respectively for organic carbon, organic matter, total nitrogen, potassium, calcium<br>and magnesium contents except for phosphorus with the highest value of 18.12 mg/kg observed at 5% contamination<br>level. Also, 15% spent diesel oil contaminated-soil had the highest overall heavy metal reduction with 8.45, 7.43, 5.79,<br>42.81, 5.78 and 3.18 mg/kg respectively for Cd, Cr, Ni, Pb, Cu and Zn. At each incubation period, the pH of each contaminated-<br>soil ranged from 7 to 8. This improvement of soil nutrient content as well as reduction in the heavy metal contents of the<br>soil could be an indication of degradation of organic and inorganic contaminants by P. ostreatus.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/547Subsistence of four bacteria isolated from Nigerian aquaculture farms on oxytetracycline2021-07-12T08:56:58+00:00Adekanmbi, A. O.oo.adelowo@ui.edu.ngAdelowo, O. O.,oo.adelowo@ui.edu.ngLawal, O. E.oo.adelowo@ui.edu.ng<p>The ability of 147 oxytetracycline (OTC)-resistant bacteria isolated from aquaculture ponds in Ibadan, Nigeria, to subsist<br>on OTC as a source of nutrient for growth was investigated in this study. Four bacteria identified by 16S rDNA sequencing<br>as Bacillus pumilus Aa8, Bacillus pumilus Ab11, Stenotrophomonas maltophilia Ng7 and Klebsiella pneumoniae Nf6<br>utilised 4.8, 13.1, 16.5 and 19.0 % of the OTC supplied in the growth medium in 72 hours with degradation rates of 8.0, 21.8,<br>27.5 and 31.7 ?g/day respectively. The results showed that bacteria capable of subsisting on tetracycline (TET) antibiotics<br>are present in the environment. However, the risk of possible transfer of resistance determinants to other environmental<br>bacteria by these strains is a disincentive to their use in the clean-up of antibiotic contaminated ecosystems.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/565Physical and biochemical characterisation of bacteriocins produced by three Lactobacillus species2021-07-12T10:23:42+00:00Odeniyi O. A.busolaodeniyi@gmail.comOlabode T. P.tp.olabode@yahoo.com<p>The bacteriocins produced by Lactic acid bacteria (LAB) species (L. plantarum L2, L. paraplantarum L5 and L. pentosus<br>L11) were characterized with respect to their sensitivity to heat, pH, cations, surfactants, inhibitors and papain. The<br>activity of bacteriocin produced by L. plantarum L2 and L. pentosus L11 was stable at 100?C for 20 minutes while 87.5%<br>of the activity of L. paraplantarum L5 bacteriocin was retained. The bacteriocin activity of L. pentosus L11 and<br>L. plantarum L2 was unaltered after 15 minutes autoclaving while there was a reduction in that of L. paraplantarum L5<br>(6.25%). The bacteriocin activity of the LAB strains at pH 3 to pH 5 was higher than the values of the control and pH 3<br>supported the highest activity in all the isolates. Tween 80 boosted all bacteriocin activity while 5 mM-10 mM of benzoic<br>acid augmented bacteriocin activity of L. plantarum L2. The activity of L. pentosus L11 bacteriocin was unaffected at all<br>concentrations of ammonium ion (NH4<br>+) used. At 5 mM concentrations of Ca2+, the activity of the three Lactobacillus<br>bacteriocins were slightly increased (10%). Crude papain and three fold aqueous dilutions of crude papain completely<br>inhibited bacteriocin activity. The properties exhibited by these bacteriocins are an indication that they and their producing<br>strains may find applications in industrial processes.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/544A comparative analysis of the binding site of Plasmodium falciparum histone deacetylase-1 and human histone deacetylase-82021-07-12T08:31:32+00:00Odozi N. W.nw.odozi@ui.edu.ngFristrup P.fristrup.p@yahoo.com<p>Histone deacetylases (HDACs) are a family of enzymes involved in the modulation of mammalian cell chromatin structure,<br>regulation of gene expression, DNA repair, and stress response. The histone deacetylase enzymes Plasmodium falciparum<br>histone deacetylase-1 (PfHDAC-1) and human histone deacetylase-8(hHDAC 8) have been identified as novel targets for<br>development of antimalarial and antitumor drugs respectively. Homology models of PfHDAC-1 and hHDAC 8 were<br>generated from the crystal structures of HDAC8 and HDLP and IT64 respectively using a restraint guided optimization<br>procedure involving a combination of the Optimized Potentials for Liquid Simulations and the Generalized Born Surface<br>Area (OPLS/GBSA) potential setup. The models were validated using protein structure validation tools. Comparative<br>analysis of their binding sites was also carried out to identify their topology and residue interaction that could be utilized<br>in developing PfHDAC-1 specific inhibitors.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/560Depositional environment and reservoir quality appraisal of offshore ‘K-Field’, Niger Delta, Nigeria2021-07-12T10:09:46+00:00Akinsebikan, O. A.samtack77@yahoo.co.ukBoboye, O.A. oa.boboye@mail.ui.edu.ng<p>This study attempts to evaluate the hydrocarbon reservoir and depositional trend of ‘K- Field’ via suites of wireline logs.<br>This is to identify, correlate the sand bodies and evaluate their petrophysical attributes with a view of understanding their<br>variation as itaffects the reservoir, hydrocarbon prospect and productivity in the field, and to determine the<br>palaeoenvironment of the lithofacies. Six sand bodies were identified and correlated across three wells. Zones of sand<br>level with water saturation < 0.50 were the hydrocarbon bearing. The various hydrocarbon reservoirs determined are six<br>(W-7), four (W-2) and three (W-11) respectively. The average petrophysical properties of the reservoirs range from 19% to<br>25%, 54.84 md to 1159.90 md, 20% to 42% and 58% to 80% for porosity, permeability, water saturation and hydrocarbon<br>saturation respectively. The porosity and permeability range from good to excellent. The identified reservoirs show high<br>movable oil saturation (MOS), low residual oil saturation (ROS) and favourable values of movable hydrocarbon index (Sw/<br>Sxo< 0.7). The field has both oil and gas hydrocarbon with the Gas Oil Contact (GOC), Oil-Water-Contact (OWC), Oil-<br>Down-To (ODT) and Gas-Down-To (GDT) contact types. The cross plot of water saturation and porosity revealed that the<br>grain sizes of the sand bodies range from coarse to very fine. Bulk Volume Water (BVW) cross plot indicated that most of<br>the reservoirs are heterogeneous and not at irreducible water saturation. The log facies recognized suggest a palaeo-<br>depositional environment of basin plain, crevasse splay, prograding and transgressive marine shelves.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/527Palyno-environmental study of the Araromi-1 Well, eastern Dahomey Basin, south-west Nigeria2021-07-09T11:21:02+00:00Amodu O. Iolukris2009@gmail.comAdeigbe O. CAdeigbe@gmail.com<p>The exploration of many inland basins in Nigeria for their hydrocarbon potential is important to maintain her position in<br>the global world oil market. A total of 23 core samples extracted from Araromi-1 Well, Eastern Dahomey Basin, south-west<br>Nigeria, were carefully studied through lithostratigraphy and palynology with a view to determining the lithological<br>sequence, relative age, palynological zone and paleo-environments of deposition. The lithological characterisation revealed<br>a wholly shale unit with thin layer of clay towards the top of the well. A total of 58 palynomorphs were recovered and this<br>indicates well preserved samples with abundant and highly diverse pollen, spores and dinoflagellate cysts. The microfloral<br>assemblages include abundant zonocostites ramonae, monoporites annulatus, retitricolporites irregularis, monocolpites<br>marginatus, acrostichum aureum, cyathidites minor, cyathidites sp, laevigatosporites sp and proxapertites cursus.<br>Abundant quantities of dinoflagellate cysts particularly palaeocystodinium australinium, cerodinium diebeli,<br>leiosphaeridia sp, palaeocystodinium sp, seleiropemphix homotryblium oceaniclum, odontochitina operculata,<br>achromorphaera ramulifera and spiniferites sp. were recovered. Common deep water indicator, microforaminiferal wall<br>linings was also recorded. The well falls within just a zone, P100 to P200, characterized by the occurrence of paleocystodium<br>australinium, cerodinium diebeli and odontochitina operculata dated Late Maastrichtian to Late Paleocene.<br>Paleoenvironmental deductions were based on the relative abundance of freshwater swamps pollen and spores, diagnostic<br>dinoflagellate cysts and deep marine indicator inferring brackish to deep marine setting.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/554Structural equation modelling of academic performance in statistics degree programme: A case study of University of Ibadan2021-07-12T10:00:46+00:00Adejumo, N. A.nasiratade@yahoo.comOlubusoye, O. E.busoye2001@yahoo.com<p>This paper is concerned with the structural equation modelling of the academic performance in Statistics degree programme.<br>Structural equation modelling is a class of methodologies that represent hypotheses about variances and covariances of<br>observed data in terms of structural parameters defined by a theoretical model. It takes a confirmatory approach to the<br>multivariate analysis of structural theory which specified the causal relations among the multiple observed variables. The<br>causal pattern of intervariable relations within the theory was specified a priori. Structural equation modelling evaluated<br>two models – the measurement model and the structural model. The measurement model related observed responses or<br>indicators to latent variables (confirmatory factor analysis), while the structural model specified relations among latent<br>variables (path analysis). The direct and indirect effects of personal factor, psychological factor, institutional/environmental<br>factor, family characteristics, social and religious factor on the academic performance of students were studied. The<br>academic performance of students remains a top priority for students, parents, educators, researchers, administrators<br>(management) and government. The extent to which the theoretical model is supported by sample data collected from<br>undergraduate students of the Department of Statistics, University of Ibadan, was determined. There were 37 observed<br>variables and 7 latent variables. The result indicated that the attitude of students towards learning had positive direct<br>impact on academic performance, while psychological factor had negative influence on academic performance. Also, the<br>structural equation model analysis with four basic fit indices suggested a reasonable model-data fit.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/556Effect of inositol hexakisphosphate on sulphydryl reactivities of low (cat) and high (human) oxygen affinity haemoglobins2021-07-12T09:45:55+00:00Olatunde A. M.am.olatunde@ui.edu.ngBabalola J. O.abimbolatunde1@yahoo.comOkonjo K. O.ko.okonjo@yahoo.co.uk<p>The effect of organic phosphate binding on the reactivities of low-affinity cat haemoglobin in comparison to high-affinity<br>human haemoglobin was determined. Kinetics of the reaction of the CysF9[93]? sulphydryl groups in both haemoglobins<br>with 5,5?-dithiobis(2-nitrobenzoate) – DTNB – which has been linked to oxygen binding, was used to probe this effect.<br>Plots of the pseudo-first order rate constant, kobs, as a function of the DTNB concentration were linear and had positive<br>intercepts. This is indicative of the fact that the organic phosphate used, inositol hexakisphosphate (inositol-P6), does not<br>abolish reversibility in both haemoglobins. Cat haemoglobins gave simple pH-dependence profiles for the apparent<br>second order forward rate constants, kF. The presence of inositol-P6 increased kF, hence reactivity, by two-fold throughout<br>the experimental pH range for cat oxyhaemoglobin. In contrast, inositol-P6 decreased kF for human oxyhaemoglobin.<br>Around the physiological pH, kF decreased from a maximum value of 31.9 ? 0.6 mol-1dm3s-1 to 26.7 ? 0.3 mol-1dm3s-1 for<br>human haemoglobin, while it increased from a minimum of 17.2 ? 0.4 mol-1dm3s-1 to 20.6 ? 0.6 mol-1dm3s-1 for cat minor<br>oxyhaemoglobin.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/550Biosorption of cadmium (II), copper (II) and lead (II) ions by citric acid modified and unmodified cocoa pod shell: Equilibrium, kinetics and thermodynamics2021-07-12T09:12:47+00:00Alabi A. H.helenalabie3@yahoo.comAwoyemi R. F.awoyemi.rf@gmial.comAyedogbon A. S.ayedogbon.s@gmail.com<p>Chemical modification of biosorbent is a common practice in wastewater treatment when using adsorption technology.<br>Thioglycollic acid has been used for the modification of cocoa pod without any significant improvement in its adsorption<br>capacity for lead, cadmium and copper. This study is aimed at improving the sorption of these metal ions from aqueous<br>solution using citric acid as the modifying agent for cocoa pod shell. The dried cocoa pod shell was ground and reacted<br>with citric acid according to the method in the literature. Batch adsorption studies were conducted to examine the<br>influence of pH, temperature, initial metal ion concentration; sorbent dose and contact time on the biosorption of Pb2+,<br>Cu2+and Cd2+ions by modified and unmodified cocoa pod shell. Langmuir, Freundlich, Temkin and Dubinin-Radushkevich<br>models were used for fitting the equilibrium data. The amount of metal ion sorbed was determined using flame atomic<br>absorption spectrophotometer (FAAS). The result for the adsorption of the metal ions under varying pH showed that<br>sorption was pH dependent. The trend in biosorption was in the order of Cd2+> Cu2+> Pb2+ on unmodified cocoa pod shell<br>(UCPS); while the trend in biosorption of the ions onto modified cocoa pod shell (MCPS) was in the order of<br>Pb2+ > Cu2+> Cd2+. The amount of Pb2+ adsorbed increased from 4.62-33.56 mg/g after modification as shown by values<br>obtained using the Langmuir equation to fit the biosorption data. Langmuir isotherm gave R2 values which shows that it<br>satisfactorily describe the biosorption process for Pb2+, Cu2+and Cd2+ ions on UCPS and MCPS. The kinetics of the<br>sorption process was best described by the pseudo-second order kinetic model (R2>0.9922). Thermodynamic parameters<br>showed that biosorption process was feasible and spontaneous for Pb2+, Cu2+and Cd2+ions onto UCPS and MCPS. The<br>process is exothermic for Cu2+ and Cd2+ ions; but endothermic for Pb2+. This study has shown that citric acid modified<br>cocoa pod shell is a good biosorbent especially for Pb2+ ions.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/570Physical and biochemical characterisation of bacteriocins produced by three Lactobacillus species2021-07-12T10:45:38+00:00Olabode, T. P.busolaodeniyi@gmail.comOdeniyi, O. A.busolaodeniyi@gmail.com<p>The bacteriocins produced by Lactic acid bacteria (LAB) species (L. plantarum L2, L. paraplantarum L5 and L. pentosus<br>L11) were characterized with respect to their sensitivity to heat, pH, cations, surfactants, inhibitors and papain. The<br>activity of bacteriocin produced by L. plantarum L2 and L. pentosus L11 was stable at 100?C for 20 minutes while 87.5%<br>of the activity of L. paraplantarum L5 bacteriocin was retained. The bacteriocin activity of L. pentosus L11 and<br>L. plantarum L2 was unaltered after 15 minutes autoclaving while there was a reduction in that of L. paraplantarum L5<br>(6.25%). The bacteriocin activity of the LAB strains at pH 3 to pH 5 was higher than the values of the control and pH 3<br>supported the highest activity in all the isolates. Tween 80 boosted all bacteriocin activity while 5 mM-10 mM of benzoic<br>acid augmented bacteriocin activity of L. plantarum L2. The activity of L. pentosus L11 bacteriocin was unaffected at all<br>concentrations of ammonium ion (NH4<br>+) used. At 5 mM concentrations of Ca2+, the activity of the three Lactobacillus<br>bacteriocins were slightly increased (10%). Crude papain and three fold aqueous dilutions of crude papain completely<br>inhibited bacteriocin activity. The properties exhibited by these bacteriocins are an indication that they and their producing<br>strains may find applications in industrial processes.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/545Determination of the pKa values of some selected aromatic amines and naturally occurring compounds in polar and non-polar solvents at 25oC2021-07-12T08:59:07+00:00Eugene-Osoikhia T. T.kemitunmise@yahoo.co.ukTaiwo O. T.ot.taiwo@gmail.comAdegbemigun A.adegbemigun@yahoo.coppm<p>Ionisation constant is a measure of the strength of acids and bases and is expressed in terms of the pKa of conjugate acids<br>and bases. The pKa of naturally occurring khivorin, 7-keto-khivorin and some aromatic amines were measured in chloroform,<br>toluene, 50% ethanol-methanol, 50% ethanol-water and 75% ethanol-methanol mixture at 25oC by potentiometric titration.<br>The pKa values obtained are 3.23 for khivorin in toluene and 1.20 for 7-ketokhivorin in chloroform which demonstrate their<br>acidic nature. The aromatic amines: indole and 4-dimethylaminopyridine have a higher pKa values in 50% ethanol-water<br>solvent compared to their values in ethanol-methanol solvents. 3-methylindole and para-toluidine have a higher pKa<br>values in 50% and 75% ethanol-methanol solvents than in ethanol-water solvent. The higher pKa values of indole and 4-<br>diemthylaminopyridine in 50% ethanol-water signifies the best medium at which the strength of these amines could be<br>determined; whereas p-toluidine is best determined in 50% ethanol-methanol and 3-methylindole in 75% ethanol-methanol<br>mixture.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCHhttps://journals.ui.edu.ng/index.php/jsr/article/view/566Facies model building of integrated multiscale data in Dn-Field, Onshore, Niger Delta, Nigeria2021-07-12T10:27:31+00:00Arigbe, O. D.ntonme@yahoo.comNton, M. E.ntonme@yahoo.com<p>This study employs 3D Post-Stack Time-Migrated seismic data from the DN-Field, within the Coastal Swamp depobelt of<br>the Niger Delta in predicting lithofacies and fluvial facies of OVK-1 sand bodies in the Agbada Formation, as a tool to<br>identify new drillable prospects. A lithofacies model for OVK-1 reservoir sand body was generated after upscaling using<br>Most Of, as the averaging method. Calibrated by fluvio-facies at the well locations, channel sands were identified in OVK-<br>1 reservoir interval using Stochastic Sequential Indication Simulation (SSIS) algorithm. Based on lithofacies, fluvial facies<br>and biofacies analyses, a terrigenous and shallow fluvio-deltaic fill within a lowstand system tract was evident. Petrophysical<br>properties including porosity, volume of shale and effective porosity were upscaled, guided by facies model and then<br>Stochastic Gaussian Simulation (SGS) algorithm was used to produce the model. Porosity model predicted sand layers<br>having maximum porosity of 27.5% which implied very good reservoir potential. However, the volume of shale model with<br>values from 0.45 to 0.50 incorporates silt and clay and indicates marginal reservoir potential. The study identifies four<br>potential reservoir intervals with thickness ranging from 9.1 to 38.5 m. The effective porosity in OVK-1 ranges from 0.10 to<br>0.30 and identified fluvial facies such as floodplain, channel sand, levee and crevasse splay sand. Facies model show a<br>good sand distribution with minor shale localized in the western part of the Field. The central part of the model has good<br>reservoir qualities, evident by low volume of shale values and high porosities. This study helps to identify a potential<br>unexplored drillable prospect on OVK-1 sand body south-west of DN-2 well. Successful drilling of the identified prospect<br>could increase the reserve of the Field.</p>2021-07-15T00:00:00+00:00Copyright (c) 2021 JOURNAL OF SCIENCE RESEARCH