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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: The internal defense system consists of soluble components of hemolymph and circulating cells known as hemocytes and morphologies of these cells are quite similar, but with more signs of cell activations in the resistant group, and how they can act in the immune response is essential.
Abstract: The internal defense system consists of soluble components of hemolymph and circulating cells known as hemocytes. The circulating hemocytes play a central role in innate immunity. This work aimed to study the hemocytes of both susceptible and resistant B. alexandrina snails exposed to S. mansoni infection using light and electron microscopes. Two tested groups were included in the study; 60 susceptible and 60 resistant B. alexandrina snails. Both tested groups were studied as regad the hemocyte count (before and after infection) and the morphological characteristics of both circulating and tissue hemocytes by light and electron microscopes. Before infection, .there was no significant difference between the two groups as regard the hemocyte count, however after infection, there is a significant decrease in the circulating hemocytes of the resistant group. Light microscopy revealed five morphological types of circulating cells of both susceptible and resistant snails. Regarding scannig electron microscopy, hemocytes of susceptible snails appeared rounded with smooth or slightly rough surface. However, that of the resistant snails appeared irregular in shaped with corrugated surface. Furthermore, Light microscopy and the transmission electron microscopy revealed signs of cell activation in the hemocytes of the resistant group. The circulating hemocytes consist of five cell types in both susceptible and resistant B. alexandarina and morphologies of these cells are quite similar, but with more signs of cell activations in the resistant group. More specific studies on the functional activities of the hemocytes and mechanisms that may affect or influence the susceptibility and/or non-susceptibility of molluscs to invade microorganisms is essential and how they can act in the immune response.

1 citations

Journal Article
TL;DR: Isolement des hemoglobines de Biomphalaria alexandrina sous forme native ou traites chimiquement en vue of tester leur antigenicite dans des infections experimentales dansès experimentales.
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

1 citations

01 Jan 2012
TL;DR: The mode of action and neuropathological effect of Selecron, Bayluscide and ethanolic extract of Anagalis arvensis on the neurons of the cerebral ganglia in the freshwater snail B. alexandrina showed wide variation along the treated snails and control snails, and degenerated synaptic vesicles and increased number of autophagosomes and myelin figures were frequently observed.
Abstract: The present study was designed to evaluate the neuropathological effect of Bayluscide, Selecron and ethanolic extract of Anagalis on the neurons of the cerebral ganglia in the freshwater snail B. alexandrina. The snails were subjected to lethal concentrtion (LC90) of each compound (3.468 ppm for Selecron, 0.082 ppm for Bayluscide and 38.129 ppm for ethanolic extract of A. arvensis) till death of all snails after 90 minutes. Then the snails were dissected and the cerebral ganglia were removed. Electron microscopical examination of treated animals revealed severe ultrastructural alterations in the cerebral ganglia. These alterations included hyperchromatic, pyknotic or highly shrunken nuclei, extreme indentation of plasma membrane, atrophy of the perikarya of some neurons, margination of nucleoli, fragmentation or dilation of rough endoplasmic reticulum, damage of mitochondria and vacuolation and destruction of cytoplasm. In addition, degenerated synaptic vesicles and increased number of autophagosomes and myelin figures were frequently observed. The present study was designed to evaluate the mode of action and neuropathological effect of Selecron, Bayluscide and ethanolic extract of Anagalis arvensis on the neurons of the cerebral ganglia in the freshwater snail B. alexandrina. The snails were subjected to lethal concentration (LC90) of each compound (3.468 ppm for Selecron, 0.082 ppm for Bayluscide and 38.129 ppm for ethanolic extract of A. arvensis) till death of snails after 90 minutes. Then the snails were dissected and the cerebral ganglia were removed. Electron microscopical examination of treated animals revealed severe ultrastructural alterations in the cerebral ganglia. These alterations included hyperchromatic, pyknotic or highly shrunken nuclei, extreme indentation of plasma membrane, atrophy of the perikarya of some neurons, margination of nucleoli, fragmentation or dilation of rough endoplasmic reticulum, damage of mitochondria and vacuolation and destruction of cytoplasm. In addition, degenerated synaptic vesicles and increased number of autophagosomes and myelin figures were frequently observed In the present study the acetylcholinesterase enzyme (AChE) activities was measured in B. alexandrina snails exposed to the same concentration of the tested compounds. The AChE activities in B.alexandrina showed wide variation along the treated snails and control snails, The AChE activities in B. alexandrina decreased significantly at bayluside bayluside (–55.3% reduction) followed by Selecron (– 49.2% reduction), and A. arvensis (–39.9% reduction).

1 citations

02 Oct 2014
TL;DR: In this study, the ethanol extract of Pelargonium graveolens exhibited a strong molluscicidal against Biomphalaria alexandrina snails, as well as other snails.
Abstract: In this study, the ethanol extract of Pelargonium graveolens (PGE) exhibited a strong molluscicidal against Biomphalaria alexandrina snails, as well as..

1 citations

Journal Article
TL;DR: Snail populations were stable with constant recruitment of young to adult snails for all the studied species, and the diversity of snails was much higher compared to those in fish ponds and irrigation canals.
Abstract: The abundance of snail species in earthen fish ponds, irrigation and drainage canals at World Fish Center (ICLARM) in descending order was Bellamya unicolor (5089%) > Physa acuta (1894%) > Cleopatra bulimoides (76%) > Lanistes carinatus (673%) > Bulinus truncatus (519%) > Melanoides tuberculata (483%) > Lymnaea natalensis (314%) > Gabbiella senaariensis (09%) > Biomphalaria alexandrina (055%) > Lym naea truncatula (04%) > Planorbis planorbis and Succinea cleopatra (033%) > Ferrissia isseli (018%) Dead snails constituted about 519% of all the collected specimens There were dramatic decrease in the total number of pulmonates in fish ponds which contained only Tilapia sp, and a very small number of cat fish, whereas the numbers of prosobranchia snails were much higher in these ponds In fish ponds which accommodated a variety of fish species, the most dominant snail was B unicolor followed by L carinatus However, pulmonate snails were absent in these ponds B truncatus was the only snail species found in concrete tank which contained only young tilapias with a very small size (5-8 cm in standard length) In irrigation canals, the number of snails and diversity was much higher than those in fish ponds Out of 191 snails collected from inlet irrigation canal, 71 were dead, but in the outside irrigation canals, seven out of 564 snails were dead P acuta was absent in all examined fish ponds, but it was alive and in a high number (497 snails) in the outside irrigation canals The number of snails collected from Bahnasawy drain was remarkably low (128 snails), however the diversity of snails was much higher compared to those in fish ponds and irrigation canals Snail populations were stable with constant recruitment of young to adult snails for all the studied species

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202110
202014
201914
201816
201711
201616