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Search Results: 1 - 10 of 325282 matches for " S.S. Asaolu "
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Trace Metal Distribution in Nigerian Leafy Vegetables
S.S. Asaolu,M.F. Asaolu
Pakistan Journal of Nutrition , 2010,
Abstract: Trace metal distribution in some selected Nigeria leafy vegetables were determined. All the minerals investigated were found present in all the components of the selected vegetables. On the average, zinc was the most abundant metal with averages of 2.82, 1.97 and 2.08 (mg/g) in roots, stem and leaf of the vegetables, while lead was the leafy with averages of 0.07, 0.06 and 0.07 (mg/g), in roots, stems and leaves respectively. Trace metal distribution number (TMDN) indicates that the roots concentrate most of the metals than the stems and leaves.
Seasonal Variation in Heavy Metal Distribution in the Sediment of Major Dams in Ekiti-State
O.S. Adefemi,O. Olaofe,S.S. Asaolu
Pakistan Journal of Nutrition , 2007,
Abstract: Seasonal variation in heavy metal distribution of major dams in Ekiti State was carried out. Of all the metal examined, iron was found to be the most abundant metal for both seasons for the two years with an average value of 6.48 and 4.80m/100g (2001) and 6.51 and 3.62 mg/100g (2002) for dry and wet season respectively, the average metal concentration increased yearly. The concentration of most of the metals appears higher in the dry season than those recorded for the wet season. The values of the metals are below the standard limits of world health organization.
Assessment of the Physico-Chemical Status of Water Samples from Major Dams in Ekiti State, Nigeria
O.S. Adefemi,S.S. Asaolu,O. Olaofe
Pakistan Journal of Nutrition , 2007,
Abstract: The physico-chemical status of water samples from four major dams in Ekiti was assess for a period of three years (dry and wet seasons). Result showed that the physico-chemical parameters determined were higher in the dry season than wet season. The statistical analysis revealed that most of the physico-chemical parameters are significantly different except for temperature, conductivity and dissolved solid whose values are lower than the table value (0.4975 at P = 0.05). The value increased from one year to another. The result obtained fell within the maximum allowable limit set by United State Environmental Protection Agency and World Health Organization.
Evaluation of in-vitro Antioxidant Activities of Methanol Extracts of Persea americana and Cnidosculus aconitifolius
M.F. Asaolu,S.S. Asaolu,J.B. Fakunle,B.O. Emman-Okon
Pakistan Journal of Nutrition , 2010,
Abstract: The present study was undertaken to investigate the antioxidant activities of Persea americana and Cnidosculous aconitifolius. The in-vitro antioxidant activity of the methanol extracts of the leaves of Persea americana and Cnidosculous aconitifolius was evaluated using various experimental methods such as 1,1-diphenyl-2-picryl-hydrazyl (DPPH), nitric oxide and reducing power radical- scavenging activity assay. Phytochemical screening as well as the amounts of total phenol and flavonoids were also determined. The present study revealed that both the methanol extracts of the leaves of Persea americana and Cnidosculous aconitifolius possess significant antioxidant activities. However, Persea americana was found to have higher radical scavenging activity than Cnidosculous aconitifolius but the phenol content of Cnidosculous aconitifolius was higher than that of Persea americana whereas Persea americana was observed to possess more flavonoids than Cnidosculous aconitifolius.
Corrosion and Passivation Behaviours of Iron in Molten Alkali Carbonates
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2005,
Abstract: the corrosion and passivation behaviours of iron in ternary molten li2co3-na2co3-k2co3 mixture at different temperatures (475- 550 oc) were studied. the techniques of measurements were: open- circuit potential, galvanostatic anodic polarization, and cyclic voltammetry. the amounts of iron dissolved in the melt were determined by atomic absorption spectroscopy after each experiment. iron undergoes spontaneous passivation upon its immersion in the melt and the thickness of the oxide scales increases with the increase of temperature. during the passivation potential range different oxides and spinals are formed. these include a cubic solid solution of feo and a-lifeo2, a-life5o8 and a-fe2o3. at high anodic potentials the decomposition of carbonate takes place leading to passivity break down and co2 and o2 gases evolution. also, the spoliation of oxide scales in the carbonate melt occurs at the passivity breakdown. the values of corrosion parameters (rp, io, icorr, ip) were calculated. the different values of activation energy of corrosion process were calculated. the results of cyclic voltammetric investigation indicate the formation of different oxides and spinals, and the cathodic and anodic decomposition of carbonate. the corrosion tests in 0.05 m hcl solution indicate that the oxide scales formed on iron are multilayered. the outer layer is less protective than the inner one.
Hydrochloric Acid Corrosion Inhibition of Zn-Al-Cu Alloy by Methyl-Substituted Piperidines
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2008,
Abstract: the corrosion behavior of zn-al-cu alloy was investigated in hcl solution in absence and in presence of different concentrations of inhibitors. the techniques of measurements were: weight loss, linear polarization and galvanic static polarization. it was found that the corrosion rate of this alloy was higher than that of zinc or aluminum. the inhibitors used were: heterocyclic piperidine (pp), 2- methyl piperidine (2mp), 3-methyl piperidine (3mp) and 4- methyl piperidine (4mp). these inhibitors are mixed type and their inhibition efficiency, i%, increases according to the order: 2mp < 3mp < pp < 4mp. the values of activation energy of corrosion were determined in absence and in presence of inhibitors. it was found that the presence of these inhibitors increases the values of activation energy. the adsorption of these inhibitors on the surface of the alloy follows frumkin?s isotherm.
Corrosion inhibition of muntz (63% Cu, ? 37% Zn) alloy in HCl solution by some naturally occurring extracts
Mahmoud,S.S.;
Portugaliae Electrochimica Acta , 2006,
Abstract: this work presents the results of corrosion inhibition of muntz alloy (63% cu, ? 37% zn) in 1.0 m hcl by water extracts of some naturally occurring plants. these are: outer brown skin of onion (a), onion bulb (b), the cloves of garlic bulb (c), orange peels (d), and henna leaves (e). the techniques of measurements for the determination of the amount of each zinc and copper dissolved from the alloy in the aggressive solution were: weight-loss, galvanostatic polarization, linear polarization and atomic absorption spectroscopy. from these measurements the values of surface coverage, q, and inhibition efficiency were calculated. it was found that the investigated extracts have high inhibition efficiency on the corrosion of muntz alloy in 1.0 m hcl. their inhibition efficiency decreases according to the order: c > d > e > b > a. these extracts behave as mixed inhibitors, i.e., they affect both the cathodic and anodic processes. the activation energy of corrosion was calculated in absence and in presence of extracts. it was found that the presence of extracts in 1.0 m hcl solutions increases the values of activation energy of corrosion in that order of their inhibition efficiency. the inhibiting effect of these extracts results from their adsorption on the electrode surface via the adsorption centers of the compounds present in the extracts. the adsorption of these extracts onto the surface of muntz follows frumkin,s isotherm. the atomic absorption spectroscopic measurements showed that the presence of these extracts greatly inhibits the preferential dissolution of zinc from the alloy and the occurrence of simultaneous dissolution of both zinc and copper.
An Evaluation of Challenges of Secretarial Education Programme In Nigerian Universities Between 20000 – 2009
S.S Amoor
Information Manager (The) , 2009,
Abstract: The Nigerian universities that offer Business Education programme (Secretarial Option) face some challenges in the area of lack of qualified secretarial lecturers and inadequate modern office technology and information systems for teaching and learning. This paper identifies the modern office technology and information systems relevant for secretarial training, evaluates the availability of the modern office technologies for teaching/learning and examines the adequacy of the qualification of secretarial lecturers in Nigerian universities. It finally draws conclusion and recommendations among others, that the universities’ Management should establish a Resource Mobilization Centre that would be responsible for sourcing funds to purchase and install the modern office technology and information systems for teaching and learning.
Air Powered Vehicles
S.S. Verma
The Open Fuels & Energy Science Journal , 2008, DOI: 10.2174/1876973X00801010054]
Abstract: Light utility vehicles are becoming very popular means of independent transportation for short distances. Cost and pollution with petrol and diesel are leading vehicle manufacturers to develop vehicles fueled by alternative energies. Engineers are directing their efforts to make use of air as an energy source to run the light utility vehicles. The use of compressed air for storing energy is a method that is not only efficient and clean, but also economical. The major problem with compressed air cars was the lack of torque produced by the "engines" and the cost of compressing the air. Recently several companies have started to develop compressed air vehicles with many advantages and still many serious bottlenecks to tackle. This paper briefly summarize the principle of technology, latest developments, advantages and problems in using compressed air as a source of energy to run vehicles.
Methicillin resistance in Staphylococcus aureus: a review of the molecular epidemiology, clinical significance and laboratory detection methods
S.S Taiwo
West African Journal of Medicine , 2009,
Abstract: BACKGROUND: Despite the volume of knowledge, enhanced surveillance and infection control measures adopted by health care institutions to address the endemicity and frequent disease outbreaks by methicillin-resistant Staphylococcus aureus (MRSA) in hospitals and health care facilities worldwide, infections due to this organism are still responsible for about 50% of hospital acquired S. aureus infections, with increasing morbidity and mortality. OBJECTIVE: To provide regional clinicians with current information on the molecular epidemiology, laboratory detection and clinical aspects of MRSA. METHODS: A review of published literatures on MRSA in Medical Libraries and bibliographic citations on PubMed, Medline and Africa Index Medicus on molecular epidemiology and clinical diseases caused by MRSA and the assessment of the recent laboratory diagnostic approaches. RESULTS: This review showed that there has been intercontinental spread of some highly pathogenic clones of MRSA threatening to create public health hazard of unprecedented proportion, with the greatest challenge to mankind, being the development of resistance to multiple antibiotics, which in recent times had included resistance to vancomycin and other glycopeptides, the only antibiotic group effective against it. Added to this burden is the emergence of more virulent strains of community-associated MRSA (CAMRSA) which at the turn of the century, has been increasingly reported to cause infections and outbreaks in populations without predisposing risk factors, with attendant high morbidity and mortality. CONCLUSION: There is need for active MRSA surveillance by healthcare institutions in Africa to identify potential outbreaks, and vigilance in the enforcement of infection control measures such as rational prescription of antibiotics, handwashing, disinfection and sterilization that can limit the emergence and spread of more resistant clones of MRSA. WAJM 2009; 28(5): 281–290.
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