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Search Results: 1 - 10 of 482421 matches for " M. O. Oladapo "
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Biodeterioration of the African star apple (Chrysophylum albidum) in storage and the effect on its food value
N. A. Amusa, O.A. Ashaye, M. O. Oladapo
African Journal of Biotechnology , 2003,
Abstract: The biodeterioration of the African star apple fruits in storage was investigated at Ibadan, southwestern Nigeria. Eight fungal isolates were found associated with the deteriorating fruits. The fungi are Botryodiplodia theobromae, Rhizopus stolonifer, Aspergillus niger, A. tamarii, A. flavus, Fusarium spp, Penicilium spp and Trichoderma spp. All the fungal isolates were pathogenic on the star apple fruits with the exception of Trichoderma spp. The African star apple fruits stored for up to 5 days were associated with severe fungal infections and had significantly reduced crude protein, crude fat and moisture content while dry matter, potassium, calcium and sodium increased compared to the freshly harvested fruits. (African Journal of Biotechnology: 2003 2(3): 56-59)
Pre-harvest deterioration of Sour sop (Annona muricata) at Ibadan Southwestern Nigeria and its effect on nutrient composition
N. A. Amusa, O. A. Ashaye, M. O. Oladapo, O.O. Kafaru
African Journal of Biotechnology , 2003,
Abstract: The etiology of pre-harvest deterioration of Soursop (Annona muricata) fruit in Ibadan, southwestern Nigeria and the effects on its nutrient composition was investigated. Four fungal pathogens including Botryodiplodia theobromae, Fusarium sp., Rhizopus stolonifer and Aspergillus niger were found associated with the pre-harvest deteriorating soursop . B. theobromae was the most prevalent and the most pathogenic inducing rot of 75 mm in diameter within four days of inoculation. There was a remarkable reduction in carbohydrate and protein contents of the fungal infected fruits while all other nutrients and mineral assayed were higher in the infected fruits than the non-infected ones. (African Journal of Biotechnology: 2003 2(1): 23-25)
Guava Fruit Anthracnose and the Effects on its Nutritional and Market Values in Ibadan, Nigeria
N.A. Amusa,O.A. Ashaye,M.O. Oladapo,M.O. Oni
World Journal of Agricultural Sciences , 2005,
Abstract: The etiology of guava fruit anthracnose was investigated at Ibadan in the humid forest of Southern Nigeria. Result of the investigation revealed that Colletotrichum gloeosporioides was responsible for the anthracnose and the fruit rot diseases of guava fruit. Eighty percent of the guava plants were found infected with anthracnose disease and over 40% of the fruit produced on those trees were severely infected. The non-infected guava fruit was significantly higher than the anthracnose infected guava fruit in carbohydrates, crude fibre, ash, fat, protein, Ca, Fe and P. A significant reduction in the price of guava was found associated with anthracnose infected fruits in all the 3 major market surveyed.
Estimation of Lifetime Fatality Risk from Indoor Radon in Some Offices in a Nigerian University
O.M. Oni,G.A. Isola,O.O. Oladapo,E.A. Oni
Research Journal of Environmental and Earth Sciences , 2012,
Abstract: This study aims at estimating the lifetime cancer risk from the determination of 222Rn concentration level in some offices in Ogbomoso, Southwestern Nigeria. The measurement of the indoor 222Rn concentration levels at some offices in Ladoke Akintola University of Technology (LAUTECH) Ogbomoso, Nigeria was carried out using an active electronic radon gas detector, safety Pro3 (model HS71512) between February and July 2011. The result of the measurement showed that the average radon concentration is 26.3±4.17 Bq/m3. This value translated to an annual effective dose of 0.13 mSv/y and lifetime fatality risk of 9.94×10-6. These values which were found to be higher than values reported for some countries were however lower than the world average value and below the recommended action level. Thus, the results of this work have shown that the exposure to indoor radon at the offices considered is of low risk of fatal cancer occurrence due to radon inhalation.
Engineering Geophysical Study of Adagbakuja Newtown Development Southwestern Nigeria
N.A. Omoyoloye,M.I. Oladapo,O.O. Adeoye
Online Journal of Earth Sciences , 2012,
Abstract: Geophysical investigation for engineering/environmental studies has been undertaken at Adagbakuja Newtown Southwestern Nigeria. The study is aimed at assisting in the planning and development process of the proposed new town. The proposed town is underlain by Dahomey Sedimentary Basin and proximal to the Atlantic Ocean shoreline. The electrical resistivity method utilizing the schlumberger electrodes configuration was adopted. Sixteen sounding locations were occupied on traverses established in the virgin area. Interpretation of the sounding curves showed that the site is underlain by mud/clay topsoil, organic clay substratum, silty clay and fine/medium grained sand. The entire geoelectric strata are characterized by very low resistivity values (0.4-1527.6 -m) thus indicating high moisture content and high salinity. The bedrock materials are characterized by relatively high resistivity values (2.1-1527.6 -m) that are characteristic of fine/medium grained sand with a possibility of relatively higher density and higher load bearing capacity. The depth to the upper silt/fine sand unit that can support foundation of small to medium size structures varies between 3 m on the northern flank to 11 m on the south with thickness varying between 8 and 11 m. The higher resistivity geoelectric units can presumably sustain foundations of large civil engineering structures. The sands occur at depths varying between 24 m in the north and 58 m on the southwestern edge close to Asisa and Abeotobo. Overburden protection capacity of the superficial deposits in the environment varies from 2.288 mhos (good) on the eastern flank of the area at VES 7 to 80.214 mhos (excellent) at the western end (VES 11). Thus, fresh groundwater protection within perched aquifers is envisaged while very deep aquifer units with thick overlying clay column are also likely to meet protection requirements. The soil resistivity at depths greater than 1.5 m (normal depth of burial of water and other utilities pipes) varies from 0.4-101.6 -m in the environment. The degree of soil corrosivity within the Adagbakuja Newtown varies from moderately corrosive on the eastern flank to very strongly corrosive on the west. Corrosion prevention system should be considered at engineering design stages of steel/metal structures in the new town.
Hydrogeophysical Evaluation of Sites of the School of Earth and Mineral Sciences and Centre for Research and Development, Federal University of Technology, Akure, Nigeria
M.I. Oladapo,K.A. Mogaji,O.O. Adeoye
Online Journal of Earth Sciences , 2012,
Abstract: Integrated Very Low Frequency Electromagnetic (VLF-EM) and surface electrical resistivity surveys were conducted at the proposed sites for School of Earth and Mineral Sciences (SEMS) and Centre for Research and Development (CERAD) of the Federal University of Technology Akure Nigeria with a view of determining the feasibility of groundwater development in the sites. Thirteen (VLF) profiles were established on the West-East azimuth while station interval of 5 m was adopted for field data acquisition. Field values obtained from the VLF measurements have a maximum value of 9.7% thus indicating absence of major fractures. Linear features presumed to be minor fractures inferred from the filtered real map were further evaluated using electrical resistivity method. Thirteen Vertical Electrical Sounding (VES) locations were occupied at the locations delineated from the VLF results. Geoelectric sections generated from computer iterated sounding curves revealed 4 subsurface geoelectric/geologic layers consisting of topsoil, lateritic layer, weathered basement, fractured/fresh bedrock. The delineated weathered and fractured basement materials constitute shallow aquifer units in the study area. The depth to the bedrock across the study area varies between 2.8 and 15.3 m. The fractures delineated from the sounding curves are minor lineaments. The overburden thickness map shows thickness to be in excess of 10 m at the southwestern to central part of SEMS and at southeastern part of CERAD. The results of this research provide reliable background information that the groundwater potential of the area is generally low. VES 6 located within SEMS area and VES 1, 5 and 9 at the CERAD site are feasible points for groundwater development in the study area.
Terrain Conductivity Evaluation of Road Base Integrity in a Basement Complex Environment
M.I. Oladapo,O.O. Adeoye,K.A. Mogaji,S. Adeoye
Journal of Applied Sciences , 2008,
Abstract: A shallow electromagnetic evaluation of Federal University of Technology, Akure, Nigeria main road base integrity has been undertaken in this study with the aim of identifying probable zones of untimely failure. Controlled-Source Electromagnetic Method (CSEM) was adopted for the study. The road segment investigated is underlain by four different lithologic units, which are the migmatite gneiss, quartzites, charnockite and granites along the west-east direction of the campus. Quadrature phase (conductivity) and in-phase (magnetic susceptibility) were measured in both vertical and horizontal dipoles. While the vertical dipole mode has a probing depth of 6 m, the horizontal dipole mode probes at a depth of 3 m. The range of quadrature and in-phase values obtained for horizontal dipole mode is from 6 to 50 mS m-1 and 0.808 to 20.47 ppt, respectively. For vertical dipole mode, the range of quadrature and in-phase values are -21.00 -71.00 mS m-1 and -20.07 to 20.47 ppt. The ratio of vertical conductivity value (CV) to horizontal conductivity value (CH) i.e., CV/CH was utilized in assessing road-base performance. Road stability was observed where this ratio is greater than 1 (CV/CH>1) while signs of distress characterized where the ratio is less than or equal to 1 (CV/CH = 1) in vertical dipole. Likewise, relatively high magnetic susceptibility values in vertical dipole mode characterized zones of early distress. This technique is presumed useful in fast and cheap roadwork performance evaluation.
Monte-Carlo Modeling of Some Niger Delta Slope Events
M.I. Oladapo,J.S. Ojo,M.O. Olorunfemi,B.A. Adetola
Journal of Applied Sciences , 2009,
Abstract: Monte-Carlo modeling has been utilized in this study to simulate seismic P-wave events on four horizons (AA, BB, CC and DD) in a Niger Delta Slope environment with the aim of generating AVO attributes. Monte-Carlo modeling undertaken on a well log from the Gulf of Mexico served as a generic model and control. Trends analysis regressions generated in the environment served as input for the models while default parameter in SAVIOR (fluid method) was used for establishing reservoir fluid properties. Fourier velocity served as velocity function. The results of the modeling are presented as AVO crossplots for brine sand (background), residual hydrocarbon and commercial hydrocarbon. For each event, offset-dependent synthetic seismograms are also generated using Zoeppritz equations. The AA horizon is typified by incoherent orientations of AVO crossplots. The horizon is thus presumed unconsolidated. The synthetic seismogram generated shows no perceptible amplitude variation with offset on all the models. AVO crossplot of the encountered BB horizon show that most of the commercial hydrocarbon plots and some of the residual hydrocarbon plots fall on quadrant III (bright spot quadrant). Synthetic seismic generated for BB horizon exhibits positive AVO response (soft kick) on the commercial hydrocarbon model. A similar but marginal response was obtained on brine saturated BB model. Brine saturated model of the AVO crossplot for CC horizon model plotted mostly on hard sand quadrant. Conversely, presumed commercial hydrocarbon saturated CC is split between the hard sand and soft sand quadrants with low background normal values. The DD horizon is similar to the deep model of the Gulf of Mexico and hence exhibits similar crossplot. Curiously, high background normal (Bn) characterized residual hydrocarbon models while unconsolidated gas sand horizons exhibit anomalous characteristics. The AVO crossplot obtained from the Monte-Carlo model could be a robust tool for mapping reservoirs within the Niger Delta Slope.
Vascular Wilt of Roselle (Hibiscus sabdariffa L. var. sabdariffa) in the Humid Forest Region of South-western Nigeria
N.A. Amusa,A.A. Adegbite,M.O. Oladapo
Plant Pathology Journal , 2005,
Abstract: The etiology of vascular wilt of Roselle (Hibiscus sabdariffa var. sabdariffa L.) was investigated at Ibadan, in the humid forest region of south-western Nigeria. Out of 250 Roselle plants examined, 26% exhibited symptoms of wilt. The vascular wilting of Roselle was associated with Fusarium oxysporum Schlecht. Emend. Snyd and Hans. Plant debris was found associated with the fungus.
Investigations into the Role of Weeds, Soil and Plant Debris in the Epidemiology of Foliar Fungal Diseases of Yam in Western Nigeria
N.A. Amusa,A.A. Adegbite,M.O. Oladapo
International Journal of Botany , 2005,
Abstract: The role of weeds, soil and plant debris in the epidemiology of foliar diseases of yam was investigated at Ibadan Western Nigeria in the lowland humid tropics. Sclerotium rolfsii, Colletotrichum gloeosporioides, Colletotrichum graminicola, Pestalotia sp., Curvularia lunata, Curvularia eragrostidis, Drechslera sp. and Rhizoctonia solani, fungi that can be pathogenic on yam (Dioscorea alata) were isolated from weeds in the vicinity of the yam plots. Plant debris found with the yam plots also contained Sclerotium rolfsii, Colletotrichum gloeosporioides and Rhizoctonia solani. High inoculum densities of 4.61 0.36x105 cfu g 1 of S. rolfsii, 3.22 0.14x105 cfu g 1 of R. solani and 4.32 0.39x105 cfu g 1 of C. gloeosporioides were recorded in soil obtained from yam fields that were manually weeded 3 times during the experimental period. Soil samples in yam plots that were manually weeded 3 times and those yam plots prepared by clearing and burning the debris in situ, had varying inoculum densities of these pathogens. On yam fields with burnt debris, the incidence of Sclerotium leaf blight, Rhizoctonia leaf blight, Curvularia leaf spot and Pestalotia leaf spot were lower than those recorded after other treatments. In fields with burnt debris, the incidence of anthracnose from C. gloeosporioides was 26.9%, while in yam fields that were weed free and those that were manually weeded 3 times, the incidence of the anthracnose disease was 45.3 and 65.7%, respectively.
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