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Articles by J.O. Ajayi
Total Records ( 4 ) for J.O. Ajayi
  L.C. Saalu , G.G. Akunna and J.O. Ajayi
  The characteristic bitter taste of Vernonia amygdalina has been attributed to its anti-nutritional contents such as alkaloids, saponins, tannins and glycosides. Recently the spermiographic effect of the plant in male rats has been reported. The present study examined the effect of bitter leaf extract on 30 days oral administration of 50, 100, 200 mg kg-1 and 60 days oral administration of 200 mg kg-1 b.wt. of the extract on some fertility indices in male wistar rats. At 30 days administration, the extract produced a significant and dose dependent increase (p<0.05) in sperm concentration, percentage motility, morphology and percentage live sperm. There was a decrease in the blood level of Follicle Stimulating Hormone (FSH) but no significant increase in the levels of Leutinizing Hormone (LH) and Testosterone. Administrations of bitter leaf extract at higher dosage (200 mg kg-1 b.wt.) and duration provoked varying degrees of testicular degeneration ranging from a significant reduction in sperm concentration, motility, percentage normal morphology, percentage number of live sperm to a significant increase in the number of percentage abnormal sperm. Evidences suggest that higher dosage of bitter leaf (Vernonia amygdalina) extract administered for a longer duration could be deleterious to the testes.
  O.G. Fasanmi , O.J. Okuneye , E.S. Ajibola , M.O. Oladele- Bukola , J.F. Olona , J.O. Ajayi and F.A. Balogun
  One thousand 53 weeks old heat stressed dominant black hens at 82% egg production were allotted into four treatment groups and used to determine the effects of ventilation and modified Layer’s mash (MLM) on productive and physiological parameters. Treatment 1 (T1) are birds housed with fan and fed layers mash. Treatment 2 (T2) are birds fed MLM with fans, treatment 3 (T3) were fed layers mash but no fans. Treatment 4 (T4) fed MLM but no fans. Data were subjected to percentages and two way ANOVA. T1 had the highest mean feed intake (114.56±0.035 gm) and T4 had the lowest consumption (107.87±0.086 gm). The highest mean weekly mortality (11.10±0.98) was recorded in T3 and the lowest 6.31±0.21 in T2. T2 had the highest mean % egg production (78.18±2.80) and the lowest percentage (68.37±3.10) in T3. The result of this study also revealed that both relative humidity (RH) and temperature correlated negatively and significantly with feed consumption across the treatments. The PCV of T1 (37.20±0.70) is equal to T2 (37.40±0.10), but significantly greater (p>0.05) than T3 (34.45±0.05) and T4 (34.20±0.50), the WBC followed same trend, while other haematological parameters show no significant differences. T2 has the most significant increase in serum globulin and Uric acid, followed by T1, all other parameters are not significantly different. The electrolytes (K+, Na+, Ca2+, Cl- and HCO3-) also followed the same trend. T2 has the best performance, therefore to alleviate the effects of heat stress, dietary modifications and good ventilation is recommended.
  J.O. Ajayi , J.S.A. Adelebu and A.O. Awodugba
  Transmission of electron charge carrier in type I MQW system has been investigated by solving the effective mass equation including off-diagonal effective mass tensor elements. The boundary condition for an electron wave function (under the effective mass approximation) at a hotero junction interface is suggested and included in the calculation. The calculation reveals that the transmission coefficient is dependent on potential well depth and it is not symmetric with the angel of incidence.
  J.S.A. Adelabu , J.O. Ajayi and A.O. Awodugba
  Measurements of Optical Absorption (OA) and Photoluminescence (PL) have been carried out on type I Multiple Quantum Well (MQW) system of GaAs-AlGaAs grown by Molecular Beam Epitaxy (MBE). An attempt has been made to compare exciton peak obtained for both heavy hole and light hole at band offset of 70/30 at different temperatures (Theory and Experiment). It is revealed from the investigation that the confinement energies of the particles increase with increase in the height of the potential barrier fro electron and decrease with increase in height of the potential barrier for light hole and heavy hole. The increase is more pronounced in the case of the light hole.
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