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Articles by U.A. Ibiam
Total Records ( 3 ) for U.A. Ibiam
  A.I. Ezeribe , C.J. Chukwu , N.A. Obasi , G. Otuchristian and U.A. Ibiam
  Synthesis of mono through hexa substituted derivatives of Methylol Melamine Resins (MFR) were carried out at various catalyst (KH2PO4) concentrations of 0.5, 0.75, 1.0, 1.25 and 1.50 g. Rheological/mechanical properties of resin-cotton network were investigated to determine the effect of catalyst concentration and degree of substitution of resins on the flow property such as viscosity. Other parameters determined include percentage yield, breaking load and crease recovery properties of resinated cotton fabric. The result revealed that the yield increased with increase in catalyst concentration and attained the highest yield of 53.7% at 0.75 g and 51.3% at 1.0 g, respectively. The damaging effects of high acid concentrations were observed particularly at 1.25 and 1.50 g KH2PO4. Yield increased as the degree of substitution increased with hexa substitution having 48.8 and 53.7% at 0.5 and 0.75 g, respectively. Shear viscosity increased as catalyst concentration increased from 0.5 to 1.0 g with hexa and penta substitution giving the highest shear viscosity of 45 poises and 35 poises, respectively. The dry crease recovery angle increased with increased catalyst concentration up to 0.75 g and attained maximum value of 125° and 115° in the warp and weft directions, respectively at 150°C. The effect of catalyst on breaking load of sample at 150°C showed an increase from 0.5-1.0 g of catalyst concentration. The highest tear strength of 10.8 and 10.2 kgf at 0.75 g catalyst concentration was observed in the warp and weft directions, respectively. Acid damage at higher concentration was also implicated for the reduced tear strength.
  P.M. Aja , A.N.C. Okaka , U.A. Ibiam , A.J. Uraku and P.N. Onu
  The proximate analysis of Talinum triangulare was carried out in both wet and dry conditions respectively. The results revealed the presence of carbohydrates (10.87±3.99 mg/g and 12.38±2.76 mg/g), steroids (106.61±2.53 mg/100mg and 11.37±1.19 mg/100g), protein (3.52±0.32% and 18.75±2.72%), oil content (3.52% and 1.44%), b-Carotene (114.5±1.49 mg/g and 40.02±0.50 mg/g) and crude fibre (12.00% and 8.50%) in dry and wet samples respectively. The wet sample was assayed for pectinases at various temperatures. This revealed the presence of pectinases with specific activities of 38.64 units/kg protein, 55.44 units/kg protein, 61.14 units/kg protein and 62.09 units/kg protein at 35, 55, 75 and 95oC respectively. These results indicate that the leaves contain an appreciable amount of nutrients and should be included in our meal for a balanced diet. The high amount of pectinases detected lends credence to the traditional use of water leaf as a softener of other vegetables species and a possible industrial application.
  K.N. Agbafor , P.M. Ajah , C.E. Offor , I.O. Igwenyi and U.A. Ibiam
  This study was aimed at investigating the effect of water and salt samples from Okposi and Uburu salt lakes on some serum trace elements and the cardiovascular system. Serum levels of copper (Cu), cadmium (Cd), cobalt (Co) manganese (Mn), cardiac troponin I (cTnI) and lipid profile were measured in albino rats after treating them with different doses of salt and water from the lakes for seven consecutive days. Average body weight, physical activities and food and intake decreased in all the treated groups compared with the control. The levels of Cu, Cd, Co and Mn in test groups were significantly higher (p<0.05) than in the control. There was a significant increase (p<0.05) in the concentrations of cardiac troponin I, cholesterol, triacylglycerol and low density lipoproteins, in the treated groups relative to the control while high density lipoproteins in the control were significantly higher (p<0.05) than the treated groups. The observations were also statistically more pronounced (p<0.05) in the groups given water samples than those administered salt samples. The differences in the levels of these parameters between groups given Okposi samples and those treated with Uburu samples were not significant (p>0.05). The effects of the samples were found to be dose- dependent. These results indicate that the samples may be toxic to the cardiovascular system and this toxicity may be reduced by the methods of processing the salt. The toxicity of the samples may be due to the chemical contents of the lakes.
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