oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 8 )

2018 ( 10 )

2017 ( 2 )

2016 ( 4 )

Custom range...

Search Results: 1 - 10 of 180 matches for " Yakubu "
All listed articles are free for downloading (OA Articles)
Page 1 /180
Display every page Item
Prevalence of Organophosphorous Pesticide Residues in Pumpkin, Spinach and Sorrel Leaves Grown in Akwanga, Nasarawa State, Nigeria  [PDF]
E. G. Ibrahim, N. Yakubu, L. Nnamonu, J. M. Yakubu
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.95032
Abstract: Three green leafy vegetable samples of pumpkin leaves, spinach leaves, and sorrel leaves were collected from three different locations in a farm in Akwanga and were tested for the presence of organophosphorus (OP) compounds. The concentrations of all the pesticide residues in the vegetable samples were determined using gas chromatography with mass spectrometry (GC-MS). The organophosphorus pesticides detected include carbaryl (0.052 mg/kg) in pumpkin, this is below European maximum residues limit (EU MRL) of 0.1 mg/kg, Dimethoate was found in pumpkin (0.165 mg/kg), spinach (0.103 mg/kg) and sorrel (0.250 mg/kg) all above the EU MRL of 0.05 mg/kg. Dichlofenthion was detected in pumpkin (0.308 mg/kg), pirimiphos methyl was detected in pumpkin and spinach (0.428 mg/kg and 0.149 mg/kg respectively), all these were below the EU MRL of 0.5 mg/kg. Chlorpyrifos was found in spinach (0.230 mg/kg) and sorrel (0.192 mg/kg) only spinach was above the EU MRL of 0.2 mg/kg. The pesticide residue Bromophosethyl was detected in all vegetables, pumpkin leaves (0.501 mg/kg), sorrel (1.571 mg/kg) and spinach (7.981 mg/kg) all above the EU MRL of 0.5 mg/kg. The remaining pesticides detected were all below their EU MRL value; these are Ethion found in spinach (0.167 mg/kg), Methyl Parathion in spinach (0.103 mg/kg) and sorrel (0.335 mg/kg). The levels of some of the organophosphorus pesticide residues found in vegetables were above the maximum residue limits (MRLs) set by the European Union. This calls for laws to regulate the use and circulation of such chemicals. Based on the observation made in these studies, it is proposed that more extensive monitoring investigation covering all vegetables part in Akwanga Nasarawa state be carried out to find the exact position of pesticide residues.
Determination of Organochlorine Pesticide Residues in Pumpkin, Spinach and Sorrel Leaves Grown in Akwanga, Nasarawa State, Nigeria  [PDF]
E. G. Ibrahim, N. Yakubu, L. Nnamonu, J. M. Yakubu
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.95031
Abstract: Three green leafy vegetable samples of pumpkin leaves, spinach leaves, and sorrel leaves were collected from a farm in Akwanga and were tested for the presence of residues of organochlorine pesticides. The concentrations of all the pesticide residues in the vegetable samples were determined using GC/MS. Among the organochlorine pesticide p,p’-DDT was detected in pumpkin (0.75 mg/kg), spinach (0.319 mg/kg) and sorrel (0.219 mg/kg). θ-BHC and γ-BHC were detected only in pumpkin leaves (0.359 mg/kg and 0.647 mg/kg respectively). Dieldrin was detected in spinach and sorrel (0.124 mg/kg and 0.053 mg/kg respectively). Endrin was detected in pumpkin (0.732 mg/kg) and Aldrin in sorrel (0.095 mg/kg). All these values were above the maximum residue limit (MRL) value of the pesticides. Endosulfan II was detected in sorrel (0.306 mg/kg) below the MRL. The levels of most of the pesticide residues found in vegetables were above the maximum residue limits (MRLs) that call for laws to regulate the use and circulation of such chemicals. Routine monitoring of pesticide residues in this study area is necessary for the prevention, control and reduction of environmental pollution, to minimize health risks.
Evaluating the Role of Shelterbelt in Vegetation Development in a Semi Arid Zone of Yobe State, Nigeria  [PDF]
Bulus Luka Gadiga, Yakubu Dan
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.75043
Abstract: This study evaluates the role of shelterbelts on the development and dynamics of vegetation in relation to livelihoods in the study area using geo-information techniques. The study covered the period between 1972 and 2007. The results show that in 1972 vegetation cover in the study area extended over an area of 6955 hectares (i.e.shrubs, grasses and trees) which represents 65% of the area; however there was a decrease in 1986 to an area of 5779 hectares (54%). Despite the establishment of shelterbelt in the area in 1987, the trend did not change. This is obvious in the reduction of vegetation cover between 1986 and 2000 to a total area of 3893 hectares (37%). The vegetation cover further decreased to 2791 hectares (26%) in 2005 and 1659 hectares (16%) in 2007 respectively. The study concludes that the establishment of shelterbelts alone cannot guarantee the success of vegetation cover development in the area without a sustainable plan which recognizes the local communities as critical stakeholders. Thus, variables like population growth and GDP have a role to play in vegetation cover depletion. The study recommends that efforts geared towards enlightenment of the local communities on the need for conservation should be encouraged by Government and Non-Governmental Organisations.
Discriminant analysis of sexual dimorphism in morphological traits of African Muscovy ducks
Yakubu,A.;
Archivos de Zootecnia , 2011,
Abstract: sexual dimorphism was examined in 221 randomly selected adult african muscovy ducks extensively reared in north central nigeria using univariate and multivariate measures of body size and skeletal proportions. the body parameters investigated included body weight, 8 primary linear body measurements [breast circumference (btc), thigh circumference (thc), body length (bdl), bill length (bll), neck length (nkl),foot length (ftl), total leg length (tll) and wing length (wnl)] and 4 morphological indices (massiveness, stockiness, long-leggedness and condition index). the univariate analysis showed male dominance (p<0.05) in all the morphometric measurements, with the exception of stockiness and longleggedness where significantly higher mean values were recorded for females. low, moderate and high positive and negative correlations among the body size and shape characters of the ducks were recorded. the canonical discriminant analysis on body weight and primary linear body measurements revealed that wing length was the most discriminating variable between the sexes, followed by body weight, neck circumference, total leg length, body length and foot length respectively. three other variables not qualified to enter the model were expunged. the single discriminant function obtained (d= -3.116 + 0.280wnl+ 0.921bwt + 0.191nkl - 0.196tll 0.063bdl - 0.283ftl) correctly classified 91.4% of individuals of known-sex ducks. this might aid in ecological studies, conservation and improvement of the indigenous ducks.
Towards Content Development For Institutional Digital Repository
F Yakubu
Information Manager (The) , 2009,
Abstract: The growth in Information and Communication Technology has lead to the emergence of Institutional Digital Repository, a digital archive for the preservation and dissemination of institutional research outputs. Institutional Digital Repositories make possible global dissemination of research outputs through the use of the Internet. This paper discusses the concept of IDR, types, content, content development and highlighted the benefits of submitting electronic research work to IDR stakeholder to store, preserve and disseminate research work generated within an institution.
Biological approach to oil spills remediation in the soil
MB Yakubu
African Journal of Biotechnology , 2007,
Abstract: Perhaps there is no any other raw material that has impacted so much, and found wide application on human civilization than petroleum hydrocarbon (PHC). The paradox is that it is this same black gold that threatens human environment. PHC pollution in the environment, as well as the importance of natural interactions amongst living entities to arrest the problems hitherto caused by oil spills are hereby examined. Biological approaches to pollution remediation, which include phytoremediation, bioremediation, and application of biosurfactant, are discussed. Two angles of approach to bioremediation of PHC spills in the soil are identified; the bioaugmentation and biostimulation. The use of surfactants of microbial origin has been found to be environmentally friendly, naturally selective and stable at elevated temperatures, PH and salt concentration. Similarly, genetic methods have been found to be overwhelmingly promising in detecting as well as assessing PHC soil pollution, and clean up.
Biodegradation of Lagoma crude oil using pig dung
M Yakubu
African Journal of Biotechnology , 2007,
Abstract: Pig dung bacteria were isolated and screened for crude oil degrading capabilities. The pig dung was also investigated for enhancement of crude oil biodegradation. Addition of chicken manure to oil polluted soil (at 10% (v/w) pollution level) stimulated the biodegradation of lagoma crude oil used in the present study. In the soil amended with pig dung, 68.2% of the crude oil was degraded, whereas only 50.7% of same oil was degraded in the unamended soil. The pH of the amended soil rose from 6.2 to 7.2. Pig dung was found to contain 1.7 x 106 cfu g-1 crude oil degrading bacteria, and 1.8 x 108 cfu g-1 aerobic heterotrophs. The crude oil utilizing bacteria were identified as species of Pseudomonas, Proteus, Klebsiella, Bacillus and Micrococcus. Pig dung could therefore be an option for crude oil pollution mitigation project.
Child Health Care in Nigeria: Historical background
AM Yakubu
Nigerian Journal of Paediatrics , 2012,
Abstract: No
FIXING MULTICOLLINEARITY INSTABILITY IN THE PREDICTION OF BODY WEIGHT FROM MORPHOMETRIC TRAITS OF WHITE FULANI COWS
Abdulmojeed YAKUBU
Journal of Central European Agriculture , 2011,
Abstract: Body weight and nine morphostructural characters (withers height, rump height, heart girth, body length, head width, cannon circumference, shoulder width, rump width and rump length) of 83 White Fulani cows aged 1.5-2.4 years old were used to study the problem of multicollinearity instability in the estimation of body weight from morphological indices. Pairwise phenotypic correlations indicated a high and positive significant relationship between body weight and body dimensions (r = 0.61- 0.94; P<0.01). Among the linear type traits, the highest correlation was observed between withers height and rump height (r =0.98) while the lowest value was recorded for rump height and shoulder width (r =0.51). Severe collinearity problems were evident in 5 of the zoometrical variables as portrayed by variance inflation factors (VIFs) higher than 10.00 (VIF = 33.096, 31.421, 24.612, 22.726 and 13.327 for rump height, withers height, rump length, heart girth and body length respectively). Collinearity problems were further confirmed from the computations of the eigenvalues of the correlation matrix, condition indexes and variance proportions. Heart girth was retained among the collinear variables, and singly accounted for 87.9%, 92.3% and 94.1% of the variation in body weight in the subsequent stepwise regression, quadratic and cubic models, respectively.
Modeling, Steady-State Analysis of a SEPIC dc-dc Converter Based on Switching Function and Harmonic Balance Technique  [PDF]
Ajayi Samuel Taiwo, Joseph Yakubu Oricha
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24094
Abstract: The paper presents modeling approach of a Single Ended Primary Inductance Converter (SEPIC) system. The complete model derivation of the SEPIC converter system has been presented in different modes of operation. Steady state and small signal analysis was carried out on the converter dynamic equations using the method of Harmonic balance Technique. The steady state variables and their respective ripple quantities obtained were plotted against duty ratio D. The results obtained for a supply input voltage of 60 volts to the converter at a duty ratio of D = 0.8 , compares well with simulation results.
Page 1 /180
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.