Calcium localization in the shell-forming tissue of the freshwater snail,Biomphalaria glabrata: a comparative study of various methods for localizing calcium

1992 ◽  
Vol 24 (12) ◽  
pp. 927-938 ◽  
Author(s):  
Ulrich Bielefeld ◽  
Karl Zierold ◽  
Karl Heinz K�rtje ◽  
Wilhelm Becker
Keyword(s):  
Comparative Study ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail ◽  
Calcium Localization ◽  
Shell Forming

A light- and electron-microscopic study of enzymes in the embryonic shell-forming tissue of the freshwater snail, Biomphalaria glabrata

2005 ◽  
Vol 122 (4) ◽  
pp. 313-325 ◽  
Author(s):  
Julia C. Marxen ◽  
P. Eckhard Witten ◽  
Doreen Finke ◽  
Oliver Reelsen ◽  
Meriem Rezgaoui ◽  
...  
Keyword(s):  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail ◽  
Electron Microscopic ◽  
Embryonic Shell ◽  
Shell Forming

scholarly journals Implications of water hardness in ecotoxicological assessments for water quality regulatory purposes: a case study with the aquatic snail Biomphalaria glabrata (Say, 1818)

2014 ◽  
Vol 74 (1) ◽  
pp. 175-180 ◽  
Author(s):  
EC Oliveira-Filho ◽  
NR Caixeta ◽  
NCS Simplício ◽  
SR Sousa ◽  
TP Aragão ◽  
...  
Keyword(s):  
Water Quality ◽  
Natural Water ◽  
Water Hardness ◽  
Biomphalaria Glabrata ◽  
Water Quality Monitoring ◽  
Freshwater Snail ◽  
Survival And Reproduction ◽  
Testing Medium ◽  
Different Levels

Water hardness is a property depending on the presence of alkaline earth metals, mainly calcium and magnesium. Among the strategies for water quality monitoring, ecotoxicological assays are performed to minimize impacts and classify water bodies. For these laboratory evaluations parameters are previously defined in the guidelines, including water hardness for both cultivation and testing medium. The present work was performed to evaluate the effects of different levels of water hardness on the survival and reproduction of the freshwater snail Biomphalaria glabrata and discuss the influence of natural water hardness on the results of ecotoxicological tests with these environmental samples. Comparing the groups it was possible to observe that those maintained in waters with least hardness had lower reproductive success, while the groups maintained in highest hardness showed better reproduction. These data show that waters with low hardness make the reproduction of the snail B. glabrata unfeasible, and this reveal a problem for ecotoxicity assays using natural water samples.

Comparative study on the effect of cyclic nucleotides related to the function of Biomphalaria glabrata hemocytes and human granulocytes

Acta Tropica ◽  
1999 ◽  
Vol 72 (3) ◽  
pp. 275-280 ◽  
Author(s):  
F.S.M. Bezerra ◽  
P.M.Z. Coelho ◽  
M.M. Chaves ◽  
R.L. Martins ◽  
J.A. Nogueira-Machado
Keyword(s):  
Comparative Study ◽  
Cyclic Nucleotides ◽  
Biomphalaria Glabrata ◽  
Human Granulocytes

Molecular approaches in the study of Biomphalaria glabrata – Schistosoma mansoni interactions: linkage analysis and gene expression profiling

Parasitology ◽  
2001 ◽  
Vol 123 (7) ◽  
pp. 181-196 ◽  
Author(s):  
C. S. JONES ◽  
A. E. LOCKYER ◽  
D. ROLLINSON ◽  
L. R. NOBLE
Keyword(s):  
Gene Expression ◽  
Linkage Analysis ◽  
Schistosoma Mansoni ◽  
High Throughput Screening ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail ◽  
Resistance Response ◽  
Gene Characterization ◽  
Emergent Technologies ◽  
Molecular Approaches

Gene mapping and the generation of linkage groups are fundamental to an understanding of the organization and relationships of genes and marker sequences, providing a framework with which to investigate their association with traits of interest. The abundance of techniques available for generating polymorphic molecular markers, and recent advances in high throughput screening, have allowed the extension of map analysis to the tropical freshwater snail Biomphalaria glabrata, an important intermediate host for Schistosoma mansoni. Direct comparison of gene expression by differential display screening, without prior identification of candidate genes, can be combined with mapping to quantify the involvement of specific sequences in the schistosome resistance response, and other important host–parasite interactions. Here we discuss the application of current and emergent technologies to gene characterization and linkage analysis in snail–schistosome interactions. Preliminary results from the analysis of comparative gene expression in resistant and susceptible snails are also presented.

scholarly journals No effect of mate novelty on sexual motivation in the freshwater snail Biomphalaria glabrata

2009 ◽  
Vol 6 (1) ◽  
pp. 23 ◽  
Author(s):  
Ines K Häderer ◽  
Johanna Werminghausen ◽  
Nico K Michiels ◽  
Nadine Timmermeyer ◽  
Nils Anthes
Keyword(s):  
Sexual Motivation ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail

Glycosidase activities in plasma of naive and schistosome-infected Biomphalaria glabrata (Gastropoda)

Parasitology ◽  
1999 ◽  
Vol 119 (6) ◽  
pp. 563-568 ◽  
Author(s):  
U. E. ZELCK
Keyword(s):  
Plasma Protein ◽  
Post Infection ◽  
Protein Concentration ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail ◽  
Maximum Activity ◽  
Activity Levels ◽  
Plasma Protein Concentration ◽  
Ph Optimum ◽  
Self Recognition

Activity of the following glycosidases was detected in the plasma of the freshwater snail Biomphalaria glabrata: β-D- fucosidase, β-D-glucosidase, β-D-galactosidase, β-D-mannosidase, β-D-glucuronidase, N-acetyl-β-D-galactosaminidase, N-acetyl-β-D-glucosaminidase, and lysozyme. At the physiological pH (7·2–7·4) of snail haemolymph, enzymatic activity was about 10–50% of the maximum activity at each enzyme's respective acid pH-optimum. Schistosome-susceptible B. glabrata showed lower plasma protein concentration and significantly lower enzymatic activities (U/mg protein) than schistosome-resistant snails. Changes in glycosidase activity levels correlate with the progress of infection. After successful schistosome invasion, activities of plasma glycosidases but not the concentration of total plasma proteins increased significantly during the first 2 days in both snail strains. Thus, most tegumental glycoproteins of schistosome larvae can be altered by humoral host glycosidases. The detection of only very low activities of hexosaminidases leads to the hypothesis that GalNAc/GlcNAc may be involved in the process of non-self recognition. At 4 days post-infection, glycosidase activities were identical or slightly below the levels found in naive snails. At this time of infection the parasite is encapsulated and destroyed by haemocytes of resistant snails. In susceptible snails, however, the schistosomes have transformed into sporocysts and will complete their life-cycle without eliciting effective defence reactions. After >30 days post-infection, when cercariae are fully developed in susceptible snails, plasma protein concentration decreased significantly, whereas glycosidase activities were elevated.

scholarly journals Genetic differentiation, dispersal and mating system in the schistosome-transmitting freshwater snail Biomphalaria glabrata

Heredity ◽  
2002 ◽  
Vol 89 (4) ◽  
pp. 258-265 ◽  
Author(s):  
J Mavárez ◽  
J-P Pointier ◽  
P David ◽  
B Delay ◽  
P Jarne
Keyword(s):  
Genetic Differentiation ◽  
Mating System ◽  
Biomphalaria Glabrata ◽  
Freshwater Snail

Galactan biosynthesis in snails: a comparative study of β-(1 → 6) galactosyltransferases from Helix pomatia and Biomphalaria glabrata

2000 ◽  
Vol 170 (8) ◽  
pp. 601-613 ◽  
Author(s):  
H. Bretting ◽  
M. Messer ◽  
L. Bornaghi ◽  
L. Kröger ◽  
P. Mischnick ◽  
...  
Keyword(s):  
Comparative Study ◽  
Helix Pomatia ◽  
Biomphalaria Glabrata
Sign in / Sign up

Export Citation Format

Share Document