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Search Results: 1 - 10 of 87760 matches for " Akinsola I Akinpelu "
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A twelve-month field study of the West African Thrush Turdus pelios (Passeriformes: Muscicapidae): Part 2: annual cycles
Akinpelu,Akinsola I;
Revista de Biología Tropical , 2005,
Abstract: in africa, birds inhabiting forested regions are less seasonal in their activities than those from open areas. in order to study annual cycles in forest regions of south western nigeria, west african thrushes (turdus pelios ) were mist-netted and banded during the last two weeks of each month. the nest is a cup-shaped structure built out of grasses, herbs, weeds, roots and earth laid out in a clockwise manner. only the nesting tree and feeding sites were defended during the breeding period. the clutch size was 2.69 ±0.20 eggs with a mean incubation period of 14.11 ±0.26 days. the mean nestling period was 15 ±1.00 days. the nestlings were fed on a variety of plant and animal matter, of which grass seeds and insects were predominant. moult was found to be protracted with a population moult period of 194 days and a much shorter individual moult period. moult and breeding periods were spread out: moult period dovetailed into the breeding period. the birds were found to gain weight during the period but they attained their maximum weight in august after the moult period. the lowest weight was recorded in february, during the peak of the dry season, when food availability was lower. rev. biol. trop. 53(1-2):239-247. epub 2005 jun 24
A twelve-month field study of the West African Thrush Turdus pelios (Passeriformes: Muscicapidae): Part 2: annual cycles
Akinsola I Akinpelu
Revista de Biología Tropical , 2005,
Abstract: In Africa, birds inhabiting forested regions are less seasonal in their activities than those from open areas. In order to study annual cycles in forest regions of South western Nigeria, West African Thrushes (Turdus pelios ) were mist-netted and banded during the last two weeks of each month. The nest is a cup-shaped structure built out of grasses, herbs, weeds, roots and earth laid out in a clockwise manner. Only the nesting tree and feeding sites were defended during the breeding period. The clutch size was 2.69 ±0.20 eggs with a mean incubation period of 14.11 ±0.26 days. The mean nestling period was 15 ±1.00 days. The nestlings were fed on a variety of plant and animal matter, of which grass seeds and insects were predominant. Moult was found to be protracted with a population moult period of 194 days and a much shorter individual moult period. Moult and breeding periods were spread out: moult period dovetailed into the breeding period. The birds were found to gain weight during the period but they attained their maximum weight in August after the moult period. The lowest weight was recorded in February, during the peak of the dry season, when food availability was lower. Rev. Biol. Trop. 53(1-2):239-247. Epub 2005 Jun 24 El nido del tordo africano occidental es una estructura en forma de copa construida con pastos, hierbas, malezas, raíces y tierra, proyectado en el sentido de las manecillas del reloj. Solamente el árbol con el nido y los sitios de alimentación son defendidos durante la crianza. El tama o de la nidada fue 2.69 ± 0.20 huevos con un periodo de incubación de 14.11 ± 0.26 días. El periodo promedio de cría fue de 15 ± 1.00 días. Los polluelos fueron alimentados con una variedad de material animal y vegetal, predominando las semillas de pasto y los insectos. La muda del plumaje alar es prolongada, con un período poblacional de muda de 194 días y un periodo individual mucho menor. La muda y crianza son tan prolongados que se empalman con el periodo de crianza. Las aves ganaron peso durante el periodo pero alcanzaron su peso máximo en agosto, después del periodo de muda. El peso más bajo fue el de febrero, lo que coincide con el pico de la estación seca, cuando los recursos alimenticios son escasos
The Snakes of Osun Grove: a World Heritage Site in Osogbo, Nigeria
Akinpelu,Akinsola I; Areo,Adebowale;
Revista de Biología Tropical , 2007,
Abstract: the osun grove, osogbo, nigeria, is a protected area covered by riparian forest, dry high forest and derived savanna. in january and june 2000 a total of 25 of snake species were recorded with afronatrix anoscopus and calabaria reinhardti being prominent. the incidence of philothamnus semivariegatus, a savanna species, may be the result of the invasive savanna produced by farming activities around the grove. nine species, led by a. anoscopus, accounted for 69.7 % of the snake community. the dominant species are either aquatic or terrestrial, with the exception of boiga blandingi and dendroaspis viridis that can be both arboreal and terrestrial, and c. reinhardti that is fossorial. arboreal species mostly preyed on tree frogs and birds including eggs and nestlings, and the aquatic forms preyed on fish and frogs. mammals, reptiles and toads constitute the prey items of terrestrial species while fossorial species feed on annelids, molluscs, arachnids, myriapods, hexapods, amphibians, reptiles and mammals. rev. biol. trop. 55 (2): 717-721. epub 2007 june, 29.
The Snakes of Osun Grove: a World Heritage Site in Osogbo, Nigeria
Akinsola I Akinpelu,Adebowale Areo
Revista de Biología Tropical , 2007,
Abstract: The Osun Grove, Osogbo, Nigeria, is a protected area covered by riparian forest, dry high forest and derived savanna. In January and June 2000 a total of 25 of snake species were recorded with Afronatrix anoscopus and Calabaria reinhardti being prominent. The incidence of Philothamnus semivariegatus, a savanna species, may be the result of the invasive savanna produced by farming activities around the grove. Nine species, led by A. anoscopus, accounted for 69.7 % of the snake community. The dominant species are either aquatic or terrestrial, with the exception of Boiga blandingi and Dendroaspis viridis that can be both arboreal and terrestrial, and C. reinhardti that is fossorial. Arboreal species mostly preyed on tree frogs and birds including eggs and nestlings, and the aquatic forms preyed on fish and frogs. Mammals, reptiles and toads constitute the prey items of terrestrial species while fossorial species feed on annelids, molluscs, arachnids, myriapods, hexapods, amphibians, reptiles and mammals. Rev. Biol. Trop. 55 (2): 717-721. Epub 2007 June, 29. Se registró un total de 25 especies de serpientes en la arboleda de Osun en Osogbo, Nigeria, incluyendo prominentemente dos especies consideradas escasas en el sudoeste de Nigeria: Afronatrix anoscopus y Calabaria reinhardti; Philothamnus semivariegatus, una especie de la sabana, es común posiblemente debido a las actividades de cultivo fuera de la reserva. Junto con las ocho especies abundantes siguientes, A. anoscopus, representó el 69.7 % de la comunidad de serpientes. Las especies dominantes son acuáticas o terrestres, con excepción de Boiga blandingi y Dendroaspis viridis que son arborícolas y terrestres, y C. reinhardti que es fosorial. Las especies fosoriales tienen mayor diversidad trófica.
A twelve-month field study of the West African Thrush Turdus pelios (Passeriformes:Muscicapidae).Part 1:food and feeding ecology
Akinpelu,Akinsola I; Oyedipe,Oluseye A;
Revista de Biología Tropical , 2004,
Abstract: the feeding ecology of turdus pelios was studied from field observations and gizzard contents. quantitative data on feeding were obtained from repeated standard "fixed route "walks and observational points at seven sites from january to december 1998 on 5065ha at the obafemi awolowo university campus,ile-ife (7 o20 ? n,4 o33 ? e).walks (each lasting about two hours)were started at various times of the day between 7.00 and 16.45 h.a total of 100 walks were made and binoculars were used to observe all feeding activities during 10 minutes at each site.each feeding record included food type,method of feeding and reaction with con-specifics at feeding sites.gizzards from mist-netted specimens were also studied.these birds fed most commonly twice a day between 06.00-9.30hr in the morning and between 17.00-18.30hr in the evening.field observations showed that about 62%of the diet consisted of plant matter.the prey items were earthworms and terrestrial arthropods, of which orthopterans alone constituted 45%of the total.the prey size consumed by both sexes overlapped extensively:differences in prey size were significant only for spiders. rev. biol. trop. 52(4):1001-1007.epub 2005 jun 24.
A twelve-month field study of the West African Thrush Turdus pelios (Passeriformes:Muscicapidae).Part 1:food and feeding ecology
Akinsola I Akinpelu,Oluseye A Oyedipe
Revista de Biología Tropical , 2004,
Abstract: The feeding ecology of Turdus pelios was studied from field observations and gizzard contents. Quantitative data on feeding were obtained from repeated standard "fixed route "walks and observational points at seven sites from January to December 1998 on 5065ha at the Obafemi Awolowo University campus,Ile-Ife (7 o20 ’ N,4 o33 ’ E).Walks (each lasting about two hours)were started at various times of the day between 7.00 and 16.45 h.A total of 100 walks were made and binoculars were used to observe all feeding activities during 10 minutes at each site.Each feeding record included food type,method of feeding and reaction with con-specifics at feeding sites.Gizzards from mist-netted specimens were also studied.These birds fed most commonly twice a day between 06.00-9.30hr in the morning and between 17.00-18.30hr in the evening.Field observations showed that about 62%of the diet consisted of plant matter.The prey items were earthworms and terrestrial arthropods, of which orthopterans alone constituted 45%of the total.The prey size consumed by both sexes overlapped extensively:differences in prey size were significant only for spiders. Rev. Biol. Trop. 52(4):1001-1007.Epub 2005 Jun 24. Se examina la ecología alimenticia del ave Turdus pelios en Nigeria,áfrica.Se observó que se alimenta frecuentemente dos veces al día entre 6:00 -9:30 am y entre las 17:00 -18:30 pm.Observaciones de campo mostraron que alrededor del 62%de la dieta consite en material vegetal. Las presas fueron lombices y artropodos terrestres,de los cuales los ortópteros constituyen el 45%del total.El tama o de las presas consumidas por ambos sexos se traslapa ampliamente,y las diferencias fueron significativas solamente respecto al tama o de las ara as (los machos consumieron más).
Aspects of the Breeding Biology of Blue-Billed Weaver Spermophaga Haematina
A I Akinpelu, M E Fajemilehin
Journal of Science and Technology (Ghana) , 2006,
Abstract: Some aspects of the breeding biology of the Blue-billed Weaver Spermophaga haematina were examined for two consecutive years (i.e. 1999 and 2000). On the commercial farm of Obafemi Awolowo University, Ile-Ife, Nigeria. Forty four visits of 128.6 man hours were utilized searching for nests. Forty one active nests were monitored daily from 07.00 to 09.00h and from 17.00 to 19.00h to record the fate of clutches. The clutch size, breeding and nesting successes, and recruitment of fledgling per breeding seasons were determined. They were found to construct loose globular nests with side entrance out of grass inflorescences. Apart from grass inflorescences some narrow grass leaves, large soft skeletonized leaves or other fine inflorescences lining the interior form part of the nests. The nests had an external mean diameter of 112.42 ± 5.07mm, mean internal diameter 71.50±5.56mm and a mean entrance diameter of 27.83±2.41mm. Blue-billed Weaver displayed a seven-month breeding season from March to September with a peak lying between April and July. The long breeding period showed the efficiency with which the species may have utilized different food resources and hence occupy broad feeding niches. The clutch size was between 1 to 3 eggs with more than 80% of the forty-one completed clutches for the two seasons accounting for 3 eggs each. The mean clutch size was 2.74 and 2.67 eggs for 1999 and 2000 respectively. Synchronous hatching of the eggs yielded nestlings of almost the same age. Adaptations to low level nesting in Blue-billed Weaver were reduced incubation period (14.00±1.21 and 15.00± 61 days for 1999 and 2000 respectively), reduced fledgling period (15.00±0.82 and 15.00±0.25 days for 1999 and 2000 respectively) coupled with rapid growth rate of the chicks which ensured survival and early departure from the nest. Recruitment was estimated at about 34 and 27 chicks for 1999 and 2000 respectively with low mortality at hatching. Journal of Science and Technology Vol. 26 (3) 2003: pp. 12-18
The Response of Viscously Damped Euler-Bernoulli Beam to Uniform Partially Distributed Moving Loads  [PDF]
Folake Oyedigba Akinpelu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.33031
Abstract: The paper investigates the response of non-initially stressed Euler-Bernoulli beam to uniform partially distributed moving loads. The governing partial differential equations were analyzed for both moving force and moving mass problem in order to determine the behaviour of the system under consideration. The analytical method in terms of series solution and numerical method were used for the governing equation. The effect of various beam observed that the response amplitude due to the moving force is greater than that due to moving mass. It was also found that the response amplitude of the moving force problem with non-initial stress increase as mass of the mass of the load M increases.
Performance Evaluation of Palm Kernel Shell Adsorbents for the Removal of Phosphorus from Wastewater  [PDF]
Akinpelu Kamoru Babayemi
Advances in Chemical Engineering and Science (ACES) , 2017, DOI: 10.4236/aces.2017.72016
Abstract: Studies were carried out on Palm Kernel Shell, an agricultural waste available in large quantity in Nigeria, to evaluate its ability to remove phosphorus from wastewater. The adsorbents, which were prepared from Palm Kernel Shells (PKN), were characterized using Fourier Transform Infrared (FT-IR), Energy dispersive X-ray (EDX) and Scanning Electron Microscopy (SEM). Batch mode experiments were conducted to study the effects of adsorbent dosage and contact time on phosphorus adsorption. Equilibrium and Kinetic studies of the process were also carried out. Results obtained show that, FT-IR spectrum of the activated carbon displays a number of absorption peaks, reflecting the complex bio-mass structure and a variety of functional groups which explains its improved adsorption behaviour on the colloidal particles. SEM shows the spherical shape of the carbon particles with a wide range of sizes, EDX indicated the constituent elements in the adsorbent in which C and O were found to be the most abundant. Equilibrium data fitted well to the Freundlick and Langmuir models but the data were best described by Langmuir Isotherm model at the temperature of 313 K. Pseudo second order best described the kinetics of the adsorption process. Removal efficiency (E%) of 97% was attained within 120 minutes at 50 g/l adsorbent concentration, pH6 and 0.2mm particle size of the adsorbent.
Studies on the biocidal and cell membrane disruption potentials of stem bark extracts of Afzelia africana (Smith)
AKINPELU,DAVID A; AIYEGORO,AYOBAMI O; OKOH,ANTHONY I;
Biological Research , 2009, DOI: 10.4067/S0716-97602009000300008
Abstract: we had recently reported antibacterial activity in the crude extract of the stem bark of afzelia africana (akinpelu et al., 2008). in this study, we assessed the biocidal and cell membrane disruption potentials of fractions obtained from the crude extract of the plant. the aqueous (aq) and butanol (bl) fractions exhibited appreciable antibacterial activities against the test bacteria. the minimum inhibitory concentrations of the aq and bl fractions ranged between 0.313 and 2.5 mg/ml, while their minimum bactericidal concentrations varied between 0.625 and 5.0 mg/ml. also, the aq fraction killed about 95.8% of e. coli cells within 105 min at a concentration of 5 mg/ml, while about 99.1% of bacillus pumilus cells were killed by this fraction at the same concentration and exposure time. a similar trend was observed for the bl fraction. at a concentration of 5 mg/ml, the butanol fraction leaked 9.8 μg/ml of proteins from e. coli cells within 3 h, while the aqueous fraction leaked 6.5 μg/ml of proteins from the same organisms at the same concentration and exposure time. we propose that the stem bark of afzelia africana is a potential source of bioactive compounds of importance to the pharmaceutical industry.
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