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Search Results: 1 - 10 of 582637 matches for " D.A. Zahran "
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Effect of Growth Enhancers on Quality of Chicken Meat During Cold Storage
Fatma H. Ali,D.A. Zahran
Advance Journal of Food Science and Technology , 2010,
Abstract: This study was conducted to assess the effect of some growth enhancers as dietary onion & garlic (Allium sativum) and vitamin E supplementation with water on the meat quality parameters of broiler chicken. A total of 150 chicks were divided into 3 groups, 50 birds per treatment. The first group was fed control diet, the second group fed control diet supplemented with onion 2% and garlic 2% and the third group fed on control diet with vitamin E mixed with water. Birds were slaughtered at the end of the trial to evaluate pH , moisture content, cooking loss, shear force, instrumental color and fatty acids composition of refrigerated (5±1oC for 6 days) and frozen (3 and 6 months) samples. There was a significant decrease in the mean pH, shear force, a*- and b*- values and cooking loss in samples from chicken dietary supplemented with onion & garlic, and also in chicken (supplemented) with vitamin E mixed with water compared with the control. The mean moisture contents of chicken samples were not significantly influenced by the used growth enhancers. There was a numeric decrease in total saturated fatty acids (TSF %) and an increase in total unsaturated fatty acids (TUS %) in chicken samples (supplemented) with vitamin E mixed with water than control and which supplemented with onion & garlic. Palmitic was the predominant saturated fatty acid, while oleic was the predominant unsaturated fatty acid. It could be concluded that the supplementation of onion & garlic and vitamin E improved chicken meat quality during refrigerated and frozen storage.
Residential Exposure to Radio Frequency Field (RF) from Global System for Mobile Communication (GSM) Mask
D.A. Shalangwa
Journal of Engineering and Applied Sciences , 2012,
Abstract: The objective of this study is to draw a conclusive position on the effect of Radio Frequency (RF) radiation from GSM mask on human health. The measurement of the RF was conducted at 100 and 200 m away from the mask of the major GSM operators in Nigeria; GLO, MTN and ZAIN with Giga-Molar counter. The data obtained were analyzed using correlation analysis to establish the fact that whether with time exposure to RF will have discernable effect on human health. The average amount of radiation measured from each GSM mask were 1.87, 2.26 and 1.48 μvS h-1 for 100 m and 1.50, 1.32 and 1.87 μvS h-1 for 200 m with their corresponding values of coefficient of correlation as 0.008, 0.004, 0.27, -0.027, 0.039 and 0.048, respectively. The study revealed that there is insignificant effect on human health because the non ionizing electromagnetic energy has no sufficient energy to affect any part of human body.
Emotional Intelligence and the Relationship Between Job Satisfaction and Organizational Commitment of Employee in Public Parastatals in Oyo State, Nigeria
D.A. Adeyemo
Pakistan Journal of Social Sciences , 2012,
Abstract: This research examines the mediating effect of emotional intelligence on the relationship between job satisfaction and organizational commitment. Two hundred and forty employees randomly drawn from five public parastatals in Oyo State constituted the study`s sample. Variables in the study were assessed using four validated instruments. Descriptive statistics, Pearson Product Moment Correlation and hierarchical regression analysis were employed to analyze the data. The significant findings of the study reveal that there was significant impact of job satisfaction on organizational commitment and that emotional intelligence mediates the relationship between job satisfaction and organizational commitment. Based on the findings, it is suggested that emotional intelligence could be used as an intervention to enhance organizational commitment.
Effect of Multicollinearity and the Sensitivity of the Estimation Methods in Simultaneous Equation Model
D.A. Agunbiade
Journal of Modern Mathematics and Statistics , 2012, DOI: 10.3923/jmmstat.2011.9.12
Abstract: This study has investigated the effect of multicollinearity and the sensitivity of three different estimation methods of a Simultaneous equation econometric model. A Monte Carlo approach was employed for a three equation just identified model. The anlaysis for sample size n = 100 replication, R = 200 revealed the preference order of 3SLS, 2SLS and OLS using both mean and bias estimation criteria.
A Guide to Selecting Glazing Options for Amman Buildings
Dajeh D.A.
Journal of Engineering and Applied Sciences , 2012,
Abstract: The number, orientation and the type of glazing can significantly affect the amount of energy required to heat or cool a building. Effect of glazing type on solar heat gain through windows for the city (Amman) Jordan is studied. Solar energy gain is calculated using the monthly average data. The effect of window orientation on the total gain is analyzed. It is found that for all directions, solar gain is season-dependent and this dependency varies from one direction to anther. Also, the effect of number of glazing layers together with the glazing type on solar energy gain through windows is given. It is found that, south facing windows should have high SHGC to allow solar heat gain in winter. East or west facing windows should have lower SHGC. Consequently, considerable cooling and heating demand can be reduced when clear glass is replaced by bronze or low-e glass.
Effect of Precipitation on Call Quality (Signal Quality) of Global System for Mobile Communication (GSM) Network Services in Gombi, Adamawa State Nigeria
D.A. Shalangwa
Journal of Mobile Communication , 2012,
Abstract: The desire in this research is justify the effect of precipitation on signal quality of GSM network services in Gombi town. Fifteen average calls were made during rainfall in 6 months May to October, 2008 and another 15 average calls were made under ideal condition in the months of January, February, March, April, November and December 2008 to check the signal quality of the GSM network services in Gombi town. The study revealed that approximately, average of 25% of the signal quality was affected by precipitation; this means that precipitation has significant effect on signal quality of GSM network services in Gombi, which may also be applicable to the other parts of the entire country.
Distribution of Latoia Viridissima and Oryctes Monoceros in Cross River Oil Palm Estates, Nigeria
D.A. Ukeh
Agricultural Journal , 2013,
Abstract: A survey was undertaken to study the distribution and nature of infestation of L. viridissima and O. monoceros in 4 oil palm plantations in Cross River State, Nigeria. The results showed that while O. monoceros was fairly prevalent across the 3 Agro-ecological zones of the state, L. viridissima was low in numbers except at Ibiae and Boki plantations where outbreaks was recorded. The mean number of O. monoceros was 13.8 per block in Ibiae, 16.4 in Boki, 13.4 in Calaro and 15.8 in Nsadop oil palm plantations respectively showing no significant differences (p>0.05) among the plantations. However, there were significant differences (p< 0.05) in the mean number of L. viridissima with 18 per block in Ibiae, 10.8 in Boki, 6 in Calaro and 5.2 in Nsadop. Studies on the growth stages of L. viridissima under laboratory conditions showed that, the entire developmental period from egg to adult was between 86-123 days (mean 98 days).
A preliminary note on the visual changes in femur marrow fat as an indicator of femur fat percentage of springbok Antidorcas Marsupialis and blesbok Damaliscus Dorcas Phillipsi
D.A. Els
Koedoe : African Protected Area Conservation and Science , 1973, DOI: 10.4102/koedoe.v16i1.899
Abstract: Changes occuring in marrow fat reserves of animals have been used as an indicator of their physical condition (Cheatum, 1949; Riney, 1955). Cheatum correlated his visual estimate with a chemical analysis and Riney used four different condition classes on red deer (Cervus elaphus) for both colour and texture.
Some ecological factors influencing the breeding success of the Brenton Blue butterfly, Orachrysops niobe (Trimen) (Lepidoptera: Lycaenidae)
D.A. Edge
Koedoe : African Protected Area Conservation and Science , 2002, DOI: 10.4102/koedoe.v45i2.24
Abstract: The Brenton Blue butterfly, Orachrysops niobe (Trimen, 1862) (Lepidoptera:Lycaenidae), is endemic to the southern Cape and is currently listed as Endangered. This study looks at some of the key ecological factors influencing the breeding success of the species—host plant abundance and condition, nectar sources, climate/ microclimate, and vegetation management techniques. The adult butterfly population was monitored over an entire breeding season; host plants were identified and individually monitored; and egg counts were done. This enabled the effects of a number of different management techniques to be evaluated (burning, cutting, physical removal of invasive elements, and combinations thereof). A fivefold increase in the population of O. niobe was observed over the breeding season. This increase was positively correlated to a similar increase in host plant abundance in the areas where cutting and physical removal of invasive elements was practiced. Burning, by contrast, appeared to have a negative impact on host plant and butterfly abundance over the same period. Impacts of other factors such as climate, nectar sources and the natural strength of the second brood are discussed. A hypothesis, of megaherbivore activity as the principal historical disturbance mechanism promoting locally favourable conditions for O. niobe to establish and maintain colonies, is proposed. Recommendations for reserve management and future research are made.
Faked rhinoceros horns. (Met 2 platen)
D.A. Hooijer
Bijdragen tot de Taal-, Land- en Volkenkunde , 1959,
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