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Topic: Biomphalaria

In the News (Mon 28 Dec 09)

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	Memórias do Instituto Oswaldo Cruz - The distribution of Biomphalaria spp. in different habitats in relation to ... (Site not responding. Last check: 2007-10-23)
		The purpose of this study is to examine the distribution of Biomphalaria in all types of natural and man-made habitats found in the rural area of Melquiades in Governador Valadares Prefecture in the State of Minas Gerais.
		Biomphalaria snails 3mm and larger in diameter and ova were collected for identification and snails were measured and shed for cercarea at the Centro de Pesquisas René Rachou in Belo Horizonte and the Biomedical Research Institute in Rockville, USA.
		Biomphalaria were most common in the lower portions of major tributary streams and rare in their fast-flowing headwaters.
	www.scielo.br /scielo.php?script=sci_arttext&pid=S0074-02762001000900008&lng=en&nrm=iso (4053 words)

	Susceptibility of Biomphalaria tenagophila and Biomphalaria straminea to Schistosoma mansoni infection detected by low ...
		Biomphalaria tenagophila plays an important role in the transmission of schistosomiasis through the south and southeastern regions of Brazil.
		Biomphalaria straminea is present from the north to the south of the country, being an important schistosomiasis vector in the northeastern region, in spite of the low natural infection rates in these snails".
		Biomphalaria straminea and B. tenagophila infection rates, in experimental infections, according to several authors, are normally lower1,2.11.14,16, probably due to the snails mortality before eliminating cercariae.
	www.findarticles.com /p/articles/mi_qa3855/is_200009/ai_n8915382 (874 words)

	EPAT: Large Dams and Reservoirs
		Also, the "Biomphalaria" snails, hosts for the "S. mansoni" parasite, are present in the Gezira irrigation area, but not in the Sennar reservoir itself.
		Conversely, the "Biomphalaria" snails that transmit "S. mansoni," increased and may have benefited from the changes in Nile hydrology.
		These conditions favor breeding of "Biomphalaria pfeifferi" snails that were previously absent from the Awash valley.
	www.wisc.edu /epat/.pop-env/.schis/.format/.large-dams.html (2074 words)

	Potential use of glycogen level as biomarker of chemical stress in Biomphalaria glabrata. (Site not responding. Last check: 2007-10-23)
		Potential use of glycogen level as biomarker of chemical stress in Biomphalaria glabrata.
		Biomphalaria glabrata, a freshwater gastropod mollusc, was tested as biondicator organism to assess cadmium, lead and arsenic exposure using acute laboratory bioassays.
		Modifications of glycogen levels were measured in different anatomical regions of B. glabrata in order to test the usefulness of this parameter as a general biomarker of chemical stress.
	jul.2006.med-bib.com /16740351.htm (253 words)

	FWGSC > Biomphalaria obstructa
		It was the summer of 1988, and she had just waded ashore from the pond at Charles Towne Landing State Park, not a mile from my home in the Charleston suburbs.
		As the host of schistosomiasis in the New World, snails of the genus Biomphalaria have been targeted for extensive research (Malek 1958, Dillon 2000: 61-66).
		Sullivan, J.T. and Hu, P.C. Fate of Schistosoma mansoni in Biomphalaria obstructa.
	www.cofc.edu /~dillonr/FWGSC/b_obstructa.html (370 words)

	Medical Ecology >> Infectious Diseases >> Background
		Biomphalaria and Bulinus are the two primary genera of snails capable of harboring infections with Schistosoma mansoni and S, haematobium.
		Biomphalaria eggs are circular or oval, and attached to flat surfaces, while Bulinus eggs are more elongated and are often wrapped around the curved surfaces of plant stems.
		In the laboratory, Biomphalaria species native to Africa live less than one year, reaching a maximum diameter of 15-20mm.
	www.medicalecology.org /water/schistosomiasis/print_schist.htm (5011 words)

	Bioline International Official Site (site up-dated regularly)
		Identification of Biomphalaria havanensis and Biomphalaria obstructa Populations from Cuba Using Polymerase Chain Reaction and Restriction Fragment Length Polymorphism of the Ribosomal RNA Intergenic Spacer
		The correct identification of Biomphalaria snails is difficult because of the high variation in the anatomical and morphological characters and similarity among species (Paraense 1975a, Yong et al.
		Biomphalaria spp: identification of the intermediate snail hosts of Schistosoma mansoni by polymerase chain reaction amplification and restriction enzyme digestion of the ribosomal RNA gene intergenic spacer.
	www.bioline.org.br /request?oc01102 (2280 words)

	NIAID Schistosomiasis Resource Center (Site not responding. Last check: 2007-10-23)
		Romaine lettuce is a good variety to use, but the leaves should be stripped from the rib and washed before use.
		Biomphalaria glabrata and Bulinus truncatus snails can be checked for cercarial production around 4-6 weeks after exposure to miracidia (depending on the maintenance temperature).
		This process is repeated until the snails reach approximately 3-5mm in diameter, which is a suitable size for exposure to miracidia.
	www.schisto-resource.org /sop.htm (1766 words)

	Phylogenetic analysis of eleven species of Biomphalaria Preston, 1910 (Gastropoda: Planorbidae) based on comparisons of ...
		Freshwater snails in the genus Biomphalaria transmit Schislosoma mansoni in Africa, South America and the Caribbean region.
		Although considerable attention has been given to the identification of species, little is known of' evolutionary relationships among the species.
		The phylogenetic analysis provided strong support for the monophyly of Biomphalaria with either 14 or 15 synapomorphics uniting all of' the species included and separating them from the outgroup, two species of' Helisoma.
	www.uga.edu /srel/Reprint/1904.htm (406 words)

	[No title] (Site not responding. Last check: 2007-10-23)
		Biomphalaria alexandrina snail is the recognized intermediate host for Schistosoma mansoni.
		It was found that, the efficiency of the photosensitization reaction depends strongly on the concentration of PD the fluence rate and exposure time.
		The results reveal that the concentration of 10-3 M/L causes 100% mortality of the snails after 60 minutes exposure to sunlight (275 W/m2) while 10-5 M/L causes 100 % mortality of the snails after 60 minutes exposure to sunlight (550 W/m2).It is worth mentioning that field trials are in progress.
	www.kumc.edu /POL/ASP_Home/Meetings/Annual2000/Monday/view_abstract397.html (194 words)

	Bioline International Official Site (site up-dated regularly)
		Although Biomphalaria occidentalis and B.tenagophila areindistinguishable on the basis of shell morphology and the majority oftheir genital organs, only the latter is susceptible to infection withSchistosoma mansoni.
		Unsusceptibility of Biomphalaria occidentalis to infection with a strain of Schistosoma mansoni.
		Biomphalaria glabrata: extensive genetic variation in Brazilian isolates revealed by random amplified polymorphic DNA analysis.
	www.bioline.org.br /request?oc97021 (1942 words)

	[No title] (Site not responding. Last check: 2007-10-23)
		Biomphalaria alexandrina snail is the recognized intermediate host for Schistosoma mansoni.
		It was found that, the efficiency of the photosensitization reaction depends strongly on the concentration of PD the fluence rate and exposure time.
		The results reveal that the concentration of 10-3 M/L causes 100% mortality of the snails after 60 minutes exposure to sunlight (275 W/m2) while 10-5 M/L causes 100 % mortality of the snails after 60 minutes exposure to sunlight (550 W/m2).It is worth mentioning that field trials are in progress.
	pol-us.net /ASP_Home/Meetings/Annual2000/Monday/view_abstract397.html (194 words)

	The cytochemical localization of succinic dehydrogenase in the sperm mitochondria of the gastropod Biomphalaria ...
		The cytochemical localization of succinic dehydrogenase in the sperm mitochondria of the gastropod Biomphalaria glabrata.
		Articles by Bogitsh, B. The cytochemical localization of succinic dehydrogenase in the sperm mitochondria of the gastropod Biomphalaria glabrata.
		Biomphalaria glabrata was studies to ascertain succinic dehydrogenase
	www.jhc.org /cgi/content/abstract/23/1/75 (146 words)

	Bg_initiative
		An international consortium has successfully pursued the development of an internationally supported a molluscan genome project, one that is focused mainly on the freshwater gastropod Biomphalaria glabrata.
		The sequences generated as part of the consortium effort will be released to public databases in a timely fashion.
		August 2004: Biomphalaria glabrata prioritized as genomic sequencing target by NHGRI
	biology.unm.edu /biomphalaria-genome (310 words)

	Interactions between fish and aquatic macrophytes in inland waters
		Predation on mosquito larvae and on molluscs by fish may be less efficient in dense underwater meadows of submersed plants, and in such situations a joint use of herbivorous and larvivorous and/or molluscivorous fish has been recommended.
		In subtropical countries, the use of grass carp in irrigation and drainage canals, and in fish ponds, is known to reduce maintenance costs by clearing the weeds, and to reduce mosquito breeding through increased flow of water or predation.
		There is anecdotal evidence that Bulinus truncatus, a host of schistosomiasis in Egypt and the Sudan, is adversely affected by increased levels of eutrophication, but Biomphalaria alexandrina in the same water bodies appears to be increasing and hence benefiting from the ecological changes associated with eutrophication (Daldorph and Thomas, 1991).
	www.fao.org /DOCREP/006/X7580E/X7580E14.htm (1786 words)

	The effect of seasonal temperature and experimental illumination on reproductive rate in the vector snail
		Reproductive rates were highest in terms of total number of eggs, clutches and hatching under constant illumination, followed by conditions similar to the natural rhythm of illumination.
		The schedule of illumination exposure, especially that which was similar to the natural diurnal rhythm, greatly influenced reproductive rates, particularly affecting the number of eggs produced, eggs per clutch and hatching.
		The influence of temperature on the life-cycle and distribution of Biomphalaria pfeifferi (Krauss, 1948) in South-Eastern Africa.
	www.icb.ufmg.br /lpf/1-21.html (3173 words)

	Cellular Receptors and Signal Transduction in Molluscan Hemocytes: Connections with the Innate Immune System of ...
		Effects of Biomphalaria glabrata hemocyte (A) and Bge cell (B) treatments with varying concentrations of calphostin C, an inhibitor of diacylglycerol (DAG)-dependent protein kinase C (PKC), on phagocytosis of fluoresceinated E.
		Biomphalaria glabrata embryonic cells express a protein with a domain homologous to the lectin domain of mammalian selectins.
		Interleukin-1 activity in haemolymph from strains of the snail Biomphalaria glabrata varying in susceptibility to the human blood fluke, Schistosoma mansoni: Presence, differential expression, and biological function.
	icb.oxfordjournals.org /cgi/content/full/43/2/305 (4082 words)

	Document sans nom
		Evolutionary aspects of the metapopulation dynamics of Biomphalaria pfeifferi, th e intermediate host of Schistosoma mansoni.
		A spatial and temporal approach to microevolutionary forces affecting population biology in the freshwater snail Biomphalaria peifferi.
		The influence of demography, population structure and selection on molecular diversity in the selfing freshwater snail Biomphalaria pfeifferi.
	www.montpellier.inra.fr /CBGP/charbonnel_pubs.htm (270 words)

	Vitae 8 - Medicina Tropical
		Displacement of a colony of Biomphalaria glabrata by an invading population of Tarebia granifera in a small stream in Puerto Rico.
		The introduction of Melanoides tuberculata (Mollusca : Thiaridae) to the island of Saint-Lucia (West Indies) and its role in the decline of Biomphalaria glabrata, the snail intermediate host of Schistosoma mansoni.
		Displacement of Biomphalaria glabrata by the snail Thiara granifera in field habitats in St Lucia, West Indies.
	caibco.ucv.ve /caibco/CAIBCO/Vitae/VitaeOcho/Articulos/MedicinaTropical/ArchivosHTML/bibliografia.htm (828 words)

	Neotropical schistomiasis: African affinities of the host snail Biomphalaria glabrata (Gastropoda: Planorbidae).
		This trematode, and its intermediate host snails of the genus Biomphalaria, are widely distributed across Africa and the disease is thought to have quickly become established in South America and the West Indies because of' the presence of an endemic susceptible congener, B.
		glabrata with four other Neotropical and three African species of' Biomphalaria using 20 allozyme loci and found that it is phonetically and phylogenetically more like the African species; both parasite and American host snail are apparently of' historically or geologically recent African origin.
		Furthermore, genetic distances, cladistic analyses and fossil data suggest the African Biomphalaria species may themselves have evolved from Neotropical founders following an initial trans-Atlantic dispersal in the reverse direction 2.3-4.5 Mya.
	www.uga.edu /srel/Reprint/2164.htm (224 words)

	Specific identification of Egyptian Biomphalaria species and possible hybrids using the polymerase chain reaction based ...
		The snail historically implicated in the transmission of Schistosoma mansoni in Egypt is Biomphalaria alexandrina.
		The problem of schistosomiasis in Egypt has been complicated in recent years by the introduction of Biomphalaria glabrata, which has been reported to hybridize with B. alexandrina.
		This technique may be used in field surveys to study the distribution of the two species of intermediate host and their putative hybrids in Egypt.
	www.egeinfonet.i8.com /news/2005/mar/7.html (165 words)

	[No title] (Site not responding. Last check: 2007-10-23)
		(Biomphalaria glabrata) and Mg2+; up to 80% of the miracidia were recovered on the inoculated side of the chamber.
		Biomphalaria glabrata were isolated by affinity chromatography on hog gastric
		Biomphalaria glabrata (Say) (Pulmonata, Basommatophora) shell formation has been studied by light and electron microscopical techniques.
	www.vrac.iastate.edu /~berleant/MedRep/HS/H2O~SNAIL.htm (5318 words)

	Pesquisa e Pesquisadores da SUCEN
		A partir destas informações elaboramos dois experimentos a fim de comparar os dois modos de reprodução em Biomphalaria tenagophila, baseados na hipótese de que o rendimento reprodutivo da espécie seria superior em fecundação cruzada, refletindo uma vantagem adaptativa condizente com a sua maior freqüência de ocorrência.
		Snails from the genus Biomphalaria are simultaneous hermaphrodites being able to reproduce by cross-fertilization as well as by selfing.
		Cytogenetical studies in spermatogenesis of Biomphalaria tenagophila has shown that haploid number is n = 18 and as a result of the technical quality of the chromosomal preparations a larger number of meiotic stages were uncovered.
	www.sucen.sp.gov.br /pesquisa/teses/esquisto/texto_art30.htm (559 words)

	SNAILS RULE -- RESPECT SNAILS
		Some 350 snail species are estimated to be of possible medical or veterinary importance.
		The snails can be divided into two main groups: aquatic snails that live under water and cannot usually survive elsewhere (Biomphalaria, Bulinus), and amphibious snails adapted for living in and out of water (Oncomelania).
		All species of Biomphalaria and Bulinus are hermaphrodite, possessing both male and female organs and being capable of self- or cross-fertilization.
	www.freewebs.com /snailgroup/biology.htm (726 words)

	UW-Madison School of Veterinary Medicine - Academic departments
		Research in the laboratory emphasizes the cellular and biochemical interactions between larvae of the human blood fluke, Schistosoma mansoni, and its snail intermediate host, Biomphalaria glabrata.
		Carbohydrate inhibition of Biomphalaria glabrata embryonic (Bge) cell adhesion to primary sporocysts of Schistosoma mansoni.
		Protein kinase C regulation of cell spreading in the molluscan Biomphalaria glabrata embryonic (Bge) cell line.
	www.vetmed.wisc.edu /people/yoshinot (252 words)

	Bates College \| Research
		We are currently cloning excitatory receptors from Helisoma, and from another pond snail, Biomphalaria glabrata, an intermediate host for the parasite causing schistosomiasis in humans, based on sequence homology with Lymnaea.
		Cloned receptors will be expressed in Xenopus oocytes to examine their characteristics for comparison to native receptors and receptors from other species.
		Future interests include the further characterization of the role glutamate and its receptors play in the neuronal network controlling feeding behavior in the snails, particularly in Biomphalaria, for which little physiological information is available.
	www.bates.edu /x66390.xml (743 words)

	Nuclearia
		Bayne, C. (1982) Lectin-induced mitogenesis of cytotoxic amebae (Nuclearia) isolated from Biomphalaria glabrata (Mollusca:Gastropoda).
		nov. sp., isolated from three strains of the pulmonate snail Biomphalaria glabrata is related to members of the Mesomycetozoea., Int.J.Parasitol.
		Owczarzak, A., Stibbs, H.H., and Bayne, C.J. (1980) The destruction of Schistosoma mansoni mother sporocysts in vitro by amoebae isolated from Biomphalaria glabrata: an ultrastructural study.
	www.bms.ed.ac.uk /research/others/smaciver/Nuclearia.htm (372 words)

	Dr. Carolyn Cousin - Presentations (Site not responding. Last check: 2007-10-23)
		V.R. Colbert and Carolyn Cousin Autocrine PDGF-b mRNA is not associated with Early Glomerulosclerosis in Mutated BGH Transgenic Mice.
		Biomphalaria Glabrata: A Comparison of the Reproductive Capacity of LAC-Line and NMRI Snails.
		Cousin, C. Identification of Differentially Expressed Transcripts in the Albumen Glands of Susceptible ande Nonsusceptible Biomphalaria Glabrata Snails.
	www.udcscore.org /cousinpresentation.htm (664 words)

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