Topic
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: Screening tests were carried out on the action of dried powder of eight algal species against Biomphalaria alexandrina snails, where the most effective powders were from Dictyota dichotoma and Cystoseira barbata with LC50 values of 560 and 2200 ppm, respectively.
Abstract: Controlling the snail intermediate host of schistosomiasis is one of the strategies used to reduce disease incidence. In this study screening tests were carried out on the action of dried powder of...
7 citations
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TL;DR: Results indicated that LC of carbamide perhydrate against snails was 135 ppm post their exposure to direct sunlight for 4 hours at 450W /m, and these concentrations caused a highly significant suppressive effect on the activities of glycolytic, glyconeogenic, transminases, alkaline phosphatase enzyme activities and total protein content in snail s tissues.
Abstract: 3 Abstract: Carbamide perhydrate, a photosensitizer, was tested as a molluscicidal agent against the medically important snails Biomphalaria alexandrina .In addition, the effect of its sublethal concentrations on the fecundity and infection of these snails with Schistosoma mansoni miracidia was carried out. The activities of glycolytic and gluconeogic enzymes e.g. lactate dehydrogenase (LDH), pyruvate kinase (PK), phosphofructokinase (PFK), glucose phosphate isomerase(GPI), hexokinase (HK), fructose-1,6 diphosphatase, phosphoenol -pyruvate carboxykinase enzymes in snail s tissues were determined. As well, ' total protein content, alkaline phosphatase (ALP) and transaminases enzymes (ASTand ALT) were 9 0 evaluated in snail's tissues. The results indicated that LC of carbamide perhydrate against snails was 135 ppm post their exposure to direct sunlight for 4 hours at 450W /m . Under the same conditions, the 2 sublethal concentrations 60 and 85 ppm inhibited snails egg laying, while those exposed to 35 ppm laid few ones. This was confirmed by histological examination that showed a severe damage in the hermaphrodite gland cells of snails exposed to these concentrations. In addition, these concentrations caused a highly significant suppressive effect on the activities of glycolytic, glyconeogenic, transminases, alkaline phosphatase enzyme activities and total protein content in snail s tissues. Treatment of snails with ' carbamide perhydrate markedly affected their compatibility to S.mansoni infection through reducing the cercarial output from snails exposed to 35 ppm during exposure to miracidia (280 cercariae / infected snail, compared to 1237 cercariae / control infected snail). Moreover, S.mansoni miracidia failed to infect snails exposed to 60 and 85 ppm from the experimental compound.
7 citations
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TL;DR: Some compounds selected from the isatin derivatives and their metalleted products were used and showed good results and seem to be promising molluscicides.
Abstract: Some compounds selected from the isatin derivatives and their metalleted products were used to study their molluscicidal effect on Biomphalaria alexandrina. The results indicated that some of these compounds showed good results and seem to be promising molluscicides.
7 citations
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TL;DR: In this paper, four plant extracts possessing molluscicidal and insecticidal efficacy were evaluated under laboratory conditions versus Biomphalaria alexandrina, Lymnea cailliaudi snails, their egg masses and Culex pipiens larvae.
Abstract: Objective Four plant extracts possessing molluscicidal and insecticidal efficacy were evaluated under laboratory conditions versus Biomphalaria alexandrina, Lymnea cailliaudi snails, their egg masses and Culex pipiens larvae. These extracts included Grape seed, Eucalyptus, Pomegranate, Verbesina alcoholic extracts, as well as Eucalyptus oil. Methods Different mortalities in the exposed vectors were recorded due to the four plant extracts using different concentrations and exposure time. Results Total snail mortality LC 100 was (100 ppm/12-24h) for Grape seed, (200 ppm/18-24h) for Eucalyptus, (100 ppm/12-18h) for Pomegranate, (100-200 ppm/24h) for Verbesina alcoholic extracts and (100-200 ppm/12h) for Eucalyptus oil. However, only Eucalyptus, Verbesina alcoholic extracts and Eucalyptus oil revealed snail ovicidal effects. LC 100 was (100-200 ppm/24h), (100-200 ppm/24h) & (100-200 ppm/12-48h) respectively. Moreover, the same plant extracts were able to induce total Culex pipiens larvicidal mortality, LC 100 was (200 ppm/48h). However, Grape seed and Pomegranate alcoholic extracts did not induce either snail ovicidal or Culex pipiens larvicidal total mortalities. Activities of the studied plant extracts were considered using reference molluscicidal (Copper sulfate) and insecticidal (Temephos) substances. Conclusion Egyptian native plants continue to provide a wealth of potential sources for biologically active agents that may have a promising role in the production of safe, biodegradable eco-friendly and natural molluscicidal and insecticidal agents.
7 citations
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TL;DR: The natural growth, reproductivity, mortality and schistosomal infection of Biomphalaria alexandrina, the snail vector of Schistosoma mansoni in Egypt, were studied for one year in four irrigation canals.
Abstract: The natural growth, reproductivity, mortality and schistosomal infection of Biomphalaria alexandrina, the snail vector of Schistosoma mansoni in Egypt, were studied for one year in four irrigation canals, namely El-Khassa and Radwan (Giza Governorate) and Sendebis and Sanafeer (Qalyoubiya Governorate). Radwan canal contains a considerably dense Biomphalaria population and three generations of snails (parents generation and autumn and spring generations) were recognized. Two phases of growth were distinguished in both autumn and spring generations, a faster phase followed by a slower one. The faster phase extends from January to May and from March to August in the autumn and spring generations, respectively. The daily mortality rate of snails was highest in the hot season (June--September) and lowest in the cold months (December--April). Continuous reproductivity of Biomphalaria snails was observed allover the year with highest values of reproduction index from November to March. Biomphalaria snails collected from El Khassa and Radwan canals were free of S. mansoni infection, while snails of Sanafeer canal carried patent infection in September and October. Prepatent infection was also found in Sanafeer canal in July and September and in Sendebis canal in September.
7 citations