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Biomphalaria alexandrina
About: Biomphalaria alexandrina is a research topic. Over the lifetime, 413 publications have been published within this topic receiving 3781 citations.
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TL;DR: Three free fatty acids could be chemoattractive of Schistosoma miracidium, and could be used as safe environmental control compounds, which needs further research.
Abstract: Schistosomiasis is still the most common occupational health problem of rural workers in Egypt. The use of molluscicides, either chemical or biological, and environmental changing are the most successful methods of snail control. The new trend in Schistosoma control programs is to study the ecological factors that attract miracidium Schistosoma specific snails, to emphasizing to find out new environmental safe control methods. Since Schistosoma worms do not make fatty acids de novo, they require host lipids for survival and to complete their life cycle. Discriminate analysis of the estimated free fatty acids was done in this study in Biomphalaria alexandrina, Biomphalaria glabrata, and Bulinus truncatus, viz. Lymnaea truncatula and Physa acuta (Schistosoma intermediate and non-intermediate respectively). With the objective of determination of the biochemical difference that attract the infestation of Schistosoma miracidium to the target snails, as a step of the new control trends. Caprylic acid (C8:0), and Oleic acid (C18:1) are significantly lower in the tissues of Schistosoma intermediate snails compared to the non-intermediate snails. While, Capric acid (C10:0), Margaric acid (C17:0), and Lenoleic acid (C18:2) of the intermediate snails are significantly higher than that of non-intermediate snails. The percent of correct medical classification of snails are more than 80% according to Caprylic acid, Margaric acid, and Lenoleic acid, the other 15 fatty acids are less than 80%. These three free fatty acids could be chemoattractive of Schistosoma miracidium, and could be used as safe environmental control compounds, which needs further research.
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TL;DR: Biomphalaria alexandrina snails showed refractory tendency with significant increase in hemocytes; granulocytes; indicating that defense mechanism was stronger than other ones, and selection for the most tolerant ones through the successive generations indicated tolerance upgrading phenotype.
Abstract: 575 SELECTION FOR CADMIUM-TOLERANCE IN BIOMPHALARIA ALEXANDRINA SNAILS CHARACTARIZATION BASED ON GENETIC STUDIES, AND SUSCEPTIBILITY TO SCHISTOSOMA MANSONI ASSOCIATION By SHADIA H. MOHAMED, HANAA M. M. EL KHAYAT, SAMIA M. FAWZI AND DINA G. TAWFIK Department of Zoology, Faculty of Science, Ain Shams University, Cairo 11566, and Environmental Research Laboratory, Theodor Bilharz Research Institute, Embaba P.O. Box 30, Giza, Egypt (*Correspondence: dina-Gamall@hotmail.com) Abstract Biomphalaria alexandrina snails were examined for their tolerance to cadmium (Cd) toxicity through three generations produced by self-fertilization by exposing snails to serial concentrations of Cd and selection for the most tolerant ones through the successive generations. Results showed a gradual increase in the LC50 & LC90 values via successive generations indicating tolerance upgrading phenotype. Also, the selected and non-selected snails were examined for susceptibility to Schistosoma mansoni and hematological criteria. B. alexandrina showed refractory tendency with significant increase in hemocytes; granulocytes; indicating that defense mechanism was stronger than other ones. The dendro-gram based on the similarity matrices of ISSR-PCR banding patterns resulted with ten random primers, showed that the selected groups of the 1 st and 2 nd generations were the most similar and clustered together forming a distinct group that in turn cluster with nonselected laboratory group that in turn cluster with parent group (field, non-selected), while the 3 rd
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1 citations
01 Jan 2003
TL;DR: The host-finding behavior of miracidia of 2 strains of Schis- ica and showed no or a weak response to SCW from the other sympatric tosoma mansoni from Egypt and Brazil was studied by recording their species, whereas miracidi of the Brazilian strain did not differentiate responses to snail-conditioned water (SCW) from the Egyptian sym- between SCWFrom different snail species.
Abstract: The host-finding behavior of miracidia of 2 strains of Schis- ica and showed no or a weak response to SCW from the other sympatric tosoma mansoni from Egypt and Brazil was studied by recording their species, whereas miracidia of the Brazilian strain did not differentiate responses to snail-conditioned water (SCW) from the Egyptian sym- between SCW from different snail species. patric snails, Biomphalaria alexandrina, Physa acuta, Lymnaea cailliu- di, and Bulinus truncatus, as well as from Biomphalaria arabica and Gastropod molluscs serve as obligate intermediate hosts in most Biomphalaria glabrata. Miracidia of the Egyptian strain significantly trematode life cycles. The importance of snail hosts for trematode trans- preferred SCW from their compatible hosts B. alexandrina and B. arab- mission has stimulated extensive work on the compatibility between ABSTRACT: The host-finding behavior of miracidia of 2 strains of Schis- ica and showed no or a weak response to SCW from the other sympatric tosoma mansoni from Egypt and Brazil was studied by recording their species, whereas miracidia of the Brazilian strain did not differentiate responses to snail-conditioned water (SCW) from the Egyptian sym- between SCW from different snail species. patric snails, Biomphalaria alexandrina, Physa acuta, Lymnaea cailliu- di, and Bulinus truncatus, as well as from Biomphalaria arabica and Gastropod molluscs serve as obligate intermediate hosts in most Biomphalaria glabrata. Miracidia of the Egyptian strain significantly trematode life cycles. The importance of snail hosts for trematode trans- preferred SCW from their compatible hosts B. alexandrina and B. arab- mission has stimulated extensive work on the compatibility between
1 citations