Showing papers on "Biomphalaria alexandrina published in 1989"

Effect of Schistosoma mansoni infection, starvation and molluscicides on acid phosphate, transaminases and total protein in tissues and hemolymph of Biomphalaria alexandrina.

Abstract: The activities of GOT and GPT in the hemolymph of B. alexandrina were significantly decreased by S. mansoni infection. However, the total protein concentration and AcP activity were increased. Although the snail starvation decreased AcP activity in the ovotestis, it increased GOT activity in the other organs of the snails. On the other hand, the snail feeding after starvation increased significantly AcP activity in ovotestis. Natural and synthetic molluscicides inhibited the activities of GOT and GPT, however, they increased the total protein concentrations and AcP activities in the examined organs.

Selected enzymatic activities in fresh water snails, specific intermediate host for human schistosomiasis.

Abstract: The activities of aspartate aminotransferase (AST) (EC.2.6.1.1.) I, alanine aminotransferase (ALT) (EC.2.6.1.2) II and lactate dehydrogenase (LD) (EC.1.1.1.27) III have been measured in tissue homogenate and in haemolymph of Biomphalaria alexandrina snails, the specific intermediate host for the human parasitic disease schistosomiasis due to Schistosoma mansoni.

The molluscicidal properties of Ambrosia maritima L. (Compositae). 4. Temporal and spatial distribution of Biomphalaria alexandrina in Egyptian village irrigation systems with reference to schistosomiasis transmission control.

Abstract: Data on the temporal and spatial distribution of Biomphalaria alexandrina were collected throughout one year in two village irrigation systems near Alexandria, Egypt. Snails bearing Schistosoma mansoni cercariae were found from May to December but about 80% of annual transmission potential was confined from June to August. Although snail infection rates were generally 0-2%, higher rates were recorded and tended to be associated with smaller number snail collections. Infected snails were found in most canal and drain types and were judged to be present across most of the irrigated area of each village. In view of the dispersed nature of both infected snails and human-water contact in the area, it is suggested that schistosomiasis transmission is more widespread than focal. Effective transmission control using molluscicides should therefore require application to all village irrigation water-courses. The difficulties these various findings might impose on the use of commercial molluscicides are discussed and some possible advantages of the alternative plant molluscicide, Ambrosia maritima are noted.

Studies on fresh water snails, specific intermediate hosts for schistosomiasis 1--isolation of total lipids from native and irradiated snails.

Abstract: Total lipids were isolated from native and irradiated Biomphalaria alexandrina snails, specific intermediate hosts for Schistosoma mansoni.

Effect of Schistosoma mansoni infection, starvation and molluscicides on acid phosphatase, aminotransferases and total protein in tissues and hemolymph of the snail Biomphalaria alexandrina

Abstract: On observe une diminution significative de l'activite de l'AspAT et de l'AIaAT dans l'hemolymphe de B.a. infecte

Studies on fresh water snails, specific intermediate hosts for schistosomiasis--IV. Isolation of haemolymph from native and chemically pretreated snails.

Abstract: Isolement des hemoglobines de Biomphalaria alexandrina sous forme native ou traites chimiquement en vue de tester leur antigenicite dans des infections experimentales. Ces hemoglobines sont injectees a des souris. Les effets immunologiques sont etudies apres infection par Schistosoma mansoni