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Search Results: 1 - 10 of 2388 matches for " CA Mbajiorgu "
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Improvisation As A Strategy For Inventing Dynamic Solo Plays: A Study Of Tunji Sotimirin’s Molue
G Mbajiorgu
OGIRISI: a New Journal of African Studies , 2009,
Abstract: Tunji Sotimirin’s pioneering work, Molue, set the pace for the development of one-actor theatre in Nigeria. Ever since, this theatrical genre has grown, attracting various shades of attention, but also encountering its own kind of problems. Through the use of observational design, this study focuses on the story, form, structure, language, character and characterization techniques employed in the making of Sotimirin’s improvised solo play Molue. The study unveils how this laboratory oriented artist conceptualises and actualises his one-actor oriented comic production.
Can It be Achieved? Partnering Towards Improving Livelihoods in the Ganspan Settlement, Norther n Cape Province, South Africa
D Norris, EC Van Zyl, WT Hashe, MS Mafuma, MP Senyolo, SP Mngomezulu, D Enserink, JW Ngambi, CA Mbajiorgu
Africa Development , 2011,
Abstract: The Agricultural Research for Development (ARD) approach was used to determine the livelihood strategies of the Ganspan community; the current socio-economic dynamics and how they impact on livelihoods; the vision for the future; and to develop an initial road map for achieving better livelihoods. Eighty out of 210 households were sampled to determine the livelihood typology of the settlement. Participatory rural appraisal tools were used to explore stakeholders’ perceptions of the current problems/opportunities and the possible solutions. Only 3 percent of households are solely dependent on agriculture whereas the majority (76%) derive livelihood from non-agricultural activities. The rest of the households derive their livelihoods from both agricultural and non-agricultural activities. Agriculture has a modest contribution to household income compared to social grants and employment. Generally, the community is economically depressed. Developmental strategies were identified, screened and prioritised. Collaboration and joint action by various stakeholders is essential for the sustainable development of the settlement. The establishment of an innovation platform with representatives of all relevant stakeholders is strongly recommended in order to jointly implement integrated and inter-institutional development action plans.
Effects of ethanol and/or chloroquine with low protein dietary intake on some biochemical parameters in male rats.
EF Mbajiorgu, W Vlok, TA Aire, M Alberts
African Journal of Food, Agriculture, Nutrition and Development , 2009,
Abstract: In malaria-endemic developing countries, plagued with malnutrition, patients undergoing chloroquine (Q) treatment on prolonged basis often consume ethanol (E) regularly. This may constitute a serious health problem. The objective of this study was to investigate whether concurrent administration of E and Q under conditions of protein malnutrition may impact negatively on biochemical parameters. An experimental study was conducted to investigate biochemical effects of E and/or Q associated with protein malnutrition in adult male Sprague Dawley rats. Two groups of adult male Sprague-Dawley rats were fed either normal protein diet (NP, 15%) or low protein diet (LP, 6%). Each diet group includes the controls (NPC, LPC), chloroquine- (Q); [NPQ; LPQ], ethanol- (E); [NPE; LPE} or both chloroquinine and ethanol (NPEQ; LPEQ) treated groups. Chloroquine diphosphate (10mg, kg-1 body weight per rat) was administered intramuscularly, on days 0, 10, 20, and 30 to appropriate groups, while 6% E in drinking water was provided ad libitum to Etreated groups. Drinking water was given to Q-treated groups, and physiological saline was injected to E-treated groups. After 40 days, blood was collected, under ether anesthesia, by cardiac puncture for biochemical analysis. Results showed that concurrent treatment of E and Q slightly decreased TP and albumin (Alb) levels in LPEQ-rats compared to LPC, LPE and LPQ rat groups. Furthermore, TP level was substantially and significantly elevated in NPEQ-rats compared to LPEQ, NPE and NPQ rat groups. Ethanol and Chloroquine interaction exacerbated ALP and ALT activities in LPEQ-rats compared to NPEQ- rats. Urea depression was enhanced in LPEQ- than in NPEQ-rats. Creatinine levels were increased in all treatment groups. The results suggest increased toxic effect of concurrent intake of E and Q in LP- fed rats. The findings show that LP dietary intake potentiates adverse effects of combined E and Q. This has implications for clinical practice, especially in poor malaria endemic countries where prevalence of protein malnutrition is often high, and patients who consume alcohol while on chloroquine, are at greater risk of severe toxic effect of combined E and Q intake.
Estimates of Additive and Non-Additive Genetic Variances with Varying Levels of Inbreeding
D. Norris,W. Ngambi,C.A. Mbajiorgu
Journal of Biological Sciences , 2009,
Abstract: In this study, two populations with varying percentages of animals in full-sib families were simulated. For each population, two combinations of additive and dominance genetic variances of different relative magnitudes were considered thereby creating 4 sub-populations. For each sub-population, a further 3 populations (I1, I2, I3) were created with varying degree of inbreeding level (0, 0.02 and 0.05) resulting in a total of 12 populations. Constant residual variance was used in all populations. Variance components were estimated using the tilde-hat approximation to REML based on sire-dam model. Both additive and dominance genetic variances were estimated with high degree of accuracy and the level of inbreeding did not seem to result in changes in the magnitudes of the genetic variances. At low levels of inbreeding, accounting for inbreeding in genetic evaluations may not be necessary.
Relationship Between Annual Rainfall Oscillations and Mohair Production in Lesotho Between 1935 and 1996
J.W. Ng`ambi,D. Norris,C.A. Mbajiorgu
Pakistan Journal of Nutrition , 2009,
Abstract: This study was conducted to determine trends in annual rainfall oscillations and mohair production in Lesotho between 1935 and 1996. An exponential regression equation of the form LnY = LnA + bx was used to estimate trends. Between 1935 and 1965 Angora goat numbers, mohair production and mohair yield per goat increased (p<0.01) at annual rates of 1.1, 1.9 and 1.1%, respectively. During years of independence (1966-1996) annual goat numbers remained, largely, stagnant (p>0.05) at around one million animals. Mohair yield per goat declined (p<0.01) at an annual rate of 1.2% to around 0.85 kg in 1996. Similarly, mohair production declined (p<0.01) at an annual rate of 1.2% to 970,000 kg in 1996. A long-term (1935-1996) annual rainfall mean of 700 mm was calculated. There were recurrent wet (rainfall above long-term mean) and dry (rainfall below long-term mean) years. However, no clear alternate rainfall oscillations of wet and dry years were observed. It was, thus, difficult to predict years of drought (rainfall below long-term mean) from alternate annual rainfall oscillations. A positive but non-significant (p>0.05) relationship between annual mohair yield per goat (kg) and rainfall (mm) was observed. Policy implications of the results on drought preparedness are discussed.
Variation of Strength of OPC-Rice Husk Ash Cement Composites with Water-Cement Ratio.
L. O. Ettu,M. S. W. Mbajiorgu,K. C. Nwachukw,J. I. Arimanwa
International Journal of Engineering Sciences & Research Technology , 2013,
Abstract: This work investigated the variation of strength of OPC-RHA cement composites with water-cement ratio. 180 concrete cubes of 150mm x 150mm x 150mmwere produced with OPC and RHA using a constant mix ratio of 1:2:4, percentage OPC replacement with RHA of 0%, 5%, 10%, and 15%, and six water/cement ratios of 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9.180 sandcrete cubes and 180 soilcrete cubes were also produced. Three concrete, sandcrete, and soilcretecubes for each percentage OPC replacement with RHA and water/cement ratio were crushed to obtain their compressive strengths at 28 and 50 days of curing. It was found that the strength values of control composites generally reduced with increase in water-cement ratio, with maximum 28-day strength values of 24.00N/mm2 for concrete, 9.80N/mm2 for sandcrete, and 8.80N/mm2 for soilcrete obtained at water-cement ratio of about 0.4. On the other hand, the strength of OPC-RHA composites varied with both percentage replacement of OPC with RHA and water-cement ratio. Maximum 28-day strength values of 22.50N/mm2 for concrete, 9.10N/mm2 for sandcrete, and 8.10N/mm2 for soilcrete at 10% replacement of OPC with RHA were obtained using water-cement ratio of about 0.6 while maximum strength values of 20.30N/mm2 for concrete, 8.30N/mm2 for sandcrete, and 7.40N/mm2 for soilcreteat 20% replacement of OPC with RHA were obtained at water-cement ratio of about 0.7. Thus, watercement ratios of 0.6 to 0.8 should be used in producing OPC-RHA blended cement composites, depending on the mix ratio and percentage replacement of OPC with RHA.
Effect of Different Feed Restriction Regimes During the Starter Stage on Productivity and Carcass Characteristics of Male and Female Ross 308 Broiler Chickens
D.J. Novel,J.W. Ng`ambi,D. Norris,C.A. Mbajiorgu
International Journal of Poultry Science , 2009,
Abstract: An experiment was conducted to determine the effect of different feed restriction regimes during the starter stage (14-21 days) on productivity and carcass characteristics of male and female Ross 308 chickens. A 3 (feeding levels: ad-libitum intake, 50% ad-libitum intake and 75% ad-libitum intake) x 2 (male and female chickens) factorial arrangement in a complete randomized design was used. Feed restriction affected (p<0.05) live weight of chickens at the age of 21 days and male chickens were heavier (p<0.05) than females at the same age. Chickens on 75% ad libitum feeding attained complete compensation in live weight at 42 days of age while those on 50% ad libitum feeding did not. However, male chickens attained higher (p<0.05) live weights than female chickens at 42 days of age. It is suggested that 75% ad libitum restriction feeding during the starter stage from 14 up to 21 days of age may offer some economic advantage over ad-libitum feeding regimen, mainly by enhancing feed utilization. It may, therefore, be a useful nutritional strategy to reduce the cost of commercial starter grain based-diets.
Effect of Sex, Level and Period of Feed Restriction During the Starter Stage on Productivity and Carcass Characteristics of Ross 308 Broiler Chickens in South Africa
D.J. Novele,J.W. Ng`Ambi,D. Norris,C.A. Mbajiorgu
International Journal of Poultry Science , 2008,
Abstract: The effects of sex, level and period of feed restriction during the starter period on productivity and carcass characteristics of Ross 308 broiler chickens were evaluated. A 2 (male and female chickens) x 3 (feeding levels: Ad-libitum, 75% and 50% of ad libitum) x 3 (restriction periods of 5, 7 and 9 days) factorial arrangement in a complete randomized design was used. The effects of interactions were not included in the results because earlier analyses including all the interactions showed that they were not important. Level and period of feed restriction during the starter stage had an effect (P<0.05) on live weight of the chickens at 21 days of age. Chickens on 75% ad libitum feeding attained complete live weight compensation with those on Ad-libitum feeding at the age of 42 days. However, chickens on 50% ad libitum feeding did not ‘catch-up’ with those on ad libitum feeding. Differences due to the period of feed restriction during the starter stage were maintained up to the age of 42 days. Male chickens had higher (P<0.05) live weights at 42 days of age. Abdominal fat pad was not affected (P>0.05) by level and period of feed restriction and sex of chickens at 42 days of age.
Assessing the Influence of Global Climate and Anthropogenic Activities on the Water Balance of an Andean Lake  [PDF]
Julio Ca?ón, Juan Valdes
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.312098
Abstract: Tropical regions along the Andean Cordillera face an uncertain future as mountain lakes and snow peaks exhibit receding trends associated with factors such as climatic precursors and local anthropogenic activities. Tota, the largest mountain lake in the Colombian Andes, exemplifies the role played by these factors on the lake's hydrologic evolution. A monthly water balance in Tota Lake was performed using available hydrological information from 1958 to 2007 to address interannual and multiannual level fluctuations associated with human activities and climatic precursors. The balance shows that net water uses fluctuated around 2 m3/s during this period with a pattern that, although constrained during years of severe decline in lake levels, is able to explain most of the multiannual decaying trend of 1.5 cm/year in the last 50 years. The lake’s naturalized levels were used to determine the influence of climate precursors on the lake evolution. Using Multichannel Singular Spectrum Analysis (M-SSA), significant five-year ENSO and 20-year PDO related quasi-oscillations were detected, explaining 54% of the variance associated with mean annual naturalized level fluctuations. ENSO is markedly in-phase with lake levels, with critical declines associated with low precipitation and high evaporation rates during El Niño years, whereas the PDO signal exhibits a phase opposition with lake levels, with low naturalized levels during a positive PDO phase and high levels during a negative PDO phase (an important result to consider given the current cooling trend of the PDO signal).
Uso de la cámara de presión y los psicrómetros a termocupla en la determinación de las relaciones hídricas en tejidos vegetales
Phyton (Buenos Aires) , 2008,
Abstract: advantages, disadvantages and precautions of using the pressure chamber and thermocouple psychrometers for determinations of plant water potential, and osmotic and turgor pressures are discussed. comparison of results obtained with both instruments will be influenced by the sampling technique, consistency in both sampling and measurement procedures, and errors inherent to the method itself. in-situ readings of either plant or soil water potential with thermocouple psychrometers are perhaps worthless, or worse (they may even be misleading). use of thermocouple psychrometers is strictly limited to the laboratory where isothermal conditions can be obtained. the method to determine the water relations of plant tissues should be chosen according to the plant material and the research objectives.
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