Browsing by Author "Oyerinde, J. P. O."

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Effect of ultraviolet radiation on survival, infectivity and maturation of schistosoma mansonicer cariae
(Australian Society for Parasitology, 1990) Ariyo, A. A.; Oyerinde, J. P. O.
S. mansoni cercariae exposed to ultraviolet radiation for 1,3, 5,10 and 20 s as well as non-irradiated cercariae remained actively motile 30 min post-irradiation. Thereafter the activity decreased with increasing dose level of radiation and age of cercariae. There was no significant difference between the rates of attachment of the batches of cercariae. The recovery rates (0-49% of cercariae to which mice were exposed) of adult worms were, however, significantly different from the number of cercariae calculated to have attached to the mice (93.5-100% of cercariae to which mice were exposed). Maturation and penetration rates were dependent on radiation exposure levels. Numbers of eggs deposited in the liver of mice as well as hatchability rate of eggs varied significantly with the levels of exposure to radiation
Ultraviolet radiation of schistosoma mansoni. I. influence of pre-hatching radiation of eggs on hatchability of eggs and survival of miracidia
(2000) Hassan, A. A.; Oyerinde, J. P. O.
The hatchability of Schistosoma mansoni' eggs exposed to ultraviolet (UV) radiation and the activity of die hatched miracidia were examined. Hatchability decreased with die increasing exposure to irradiation. The difference in hatchability of eggs irradiated for 15 and 30 minutes were highly significant (P < 0.01. dα = 3.07 and 3.24) compared with hatchability of the non-irradiated eggs. The mean motility rates of the hatched m iracidia were found to be radiation dose-dependent. There was a 21.4% reduction in motility compared with die motility rates in the non-irradiated miracidia. The life span of irradiated miracidia was shortened, only 19% of dtose exposed to UV radiation for 30 minutes survived for 3 hours as against 80% survival rate in die non-irradiated miracidia. There was no significant difference found in the ability of hatched miracidia to attach to the snails irrespective of the radiation dose exposure the eggs were initially subjected
Ultraviolet radiation of schistosoma mansoni. II. post-hatching radiation effect on some aspects of miracidia behaviour and infectivity
(2000) Hassan, A. A.; Oyerinde, J. P. O.
Batches of Schistosoma mansorti miracidia were irradiated with ultraviolet light for varying time intervals to determine the influence of radiation on the transmission potential of radiated miracidia. There was a decrease in the survival rate of hatched-free swimming miracidia that corresponded with the increasing radiation exposure time. The activity rate of radiated miracidia also decrease with increasing radiation exposure time, showing a 69.3% reduction in the mean rate of movement of miracidia irradiated for 30 minutes and 40.4% reduction in the miracidia exposed for 0.5 minutes. The infectivity rates of the free-swimming miracidia exposed to 5.0,15.0 and 30.0 minutes uv radiation were significantly different (P<0.001, dα=4.171,5.07,5.227) compared with the non- irradiated miracidium