Biomphalaria alexandrina

About: Biomphalaria alexandrina is a research topic. Over the lifetime, 413 publications have been published within this topic receiving 3781 citations.

Biochemical and histopathological changes of Biomphalaria alexandrina snails exposed to bisphenol A

Abstract: The effects of sub-lethal concentrations of bisphenol A on some biochemical parameters in Biomphalaria alexandrina snail's hemolymph and tissues as well as on histological changes of the hermaphrodite gland were evaluated Adult snails were exposed to sub-lethal concentrations for four weeks and samples of snails were investigated after two and four weeks Total protein and albumin levels in hemolymph, as well as lipid peroxidation and glutathione contents of snails’ tissues, were measured After two weeks of exposure, total protein content and albumin levels decreased in all groups Elevation of lipid peroxidation levels was correlated with decreasing glutathione content in the treated snails Histological examination of the hermaphrodite gland revealed deformations in eggs and affected sperm production

Impact of plant extracts as molluscicides agent against Biomphalaria alexandrina snails and Schistosoma mansoni

Abstract: In the present study, the efficacy of 6 different species of medicinal plants belonging to 5 different families against Biomphalaria alexandrina snails and Schistosoma mansoni stages were examined. During screening test of water suspension and methanol extract, results revealed that Oreopanax reticulatum (Family: Araliaceae) had the strongest molluscicidal activity against Biomphalaria alexandrina snails followed by Azadirachta Indica A Juss (Maliaceae) and Dizygotheca kerchoveana (Family: Ara- liaceae). Methanol extracts revealed more molluscicidal potency as compared to water suspension. Also, the effect of methanol extracts of Oreopanax reticulatum, Azadirachta Indica A Juss (Meliaceae) and Dizygotheca kerchoveana on the survival rate and cer- carial production of B. alexandrina infected with Schistosoma mansoni, as well as on free living stages of S. mansoni (miracidia, cercariae and worm) were studied. The results show that the sublethal concentrations of methanol extract of these plants caused a considerable reduction in the survival rate of the snails and in the infectivity of S.mansoni miracidia to the snail. Reduction in the number of cercariae per snail during the patent period and in the period of cercarial shedding was also, observed. The pre- patent period for snails exposed to sublethal concentrations of the tested plants during their exposure to miracidia has been shortened. The mortality rate of miracidia and cercariae and adult worms were elevated gradually by increasing the exposure period to methanol extract of these plants. Key word — Plant extracts, molluscicidal, Schistosoma mansoni, Biomphalaria alexandrina ——————————  ——————————

Impact of some environmental factors on distribution of certain vector snails in five Egyptian Governorates

Abstract: The present study showed that the distribution of the intermediate host snails of Fasciola sp. and Schistosoma sp. varied among the five surveyed Egyptian governorates. It was found that the ratios of distribution of Lymnaea natalensis, Bulinus truncatus and Biomphalaria alexandrina snails of the total surveyed sites were 44.1%, 26.9% and 4.9% respectively. Moreover, infected L. natalensis, B. truncatus and B. alexandrina snails in these sites were 1.96%, 3.4% and 0.98% respectively. However, infected L. natalensis and B. truncatus were found in Damietta and Beheira, while infected B. alexandrina were found only in Giza. Spring was the highest season in percentage of collected snails (38.9%), while summer was the lowest one (8.8%). L. natalensis, B. truncatus and B. alexandrina showed high distribution in Ismailia, Damietta and Giza governorates as represented by 4.16, 4.38 and 0.51 snails/site respectively. Some environmental factors were found affecting the distribution of snails. The means of pH and temperature in positive sites for vector snails were 6.8 and 26.7°C respectively. L. natalensis, B. truncatus appeared in water of electric conductivity mean of 415.5 µ.mhos/cm and 284.5 ppm of mean total dissolved salts, while B. alexandrina was found at 481 µ.mhos/cm and 603 ppm respectively.