A COMPARATIVE STUDY OF THE PROTEIN COMPOSITION OF THE ALBUMEN GLAND OF TWO POPULATIONS OF BIOMPHALARIA GLABRATA (SAY) DIFFERING IN THEIR SUSCEPTIBILITY TO SCHISTOSOMA MANSONI (SAMBON).

1989 ◽  
Vol 55 (3) ◽  
pp. 373-377
Author(s):  
C. HERBERTS ◽  
J. de FRESCHEVILLE ◽  
M. QUIGNON ◽  
Y. J. GOLVAN
Keyword(s):  
Comparative Study ◽  
Schistosoma Mansoni ◽  
Protein Composition ◽  
Biomphalaria Glabrata ◽  
Albumen Gland ◽  
Two Populations

scholarly journals Behavior of Angiostrongylus costaricensis in planorbids

2006 ◽  
Vol 66 (1b) ◽  
pp. 199-204 ◽  
Author(s):  
N. M. S. Banevicius ◽  
E. M. Zanotti-Magalhães ◽  
L. A. Magalhães ◽  
A. X. Linhares
Keyword(s):  
Schistosoma Mansoni ◽  
Biomphalaria Glabrata ◽  
The Other ◽  
Intermediate Hosts ◽  
Nematode Larvae ◽  
Third Stage ◽  
Natural Hosts ◽  
Two Populations ◽  
Terrestrial Mollusks

Some terrestrial mollusks are natural hosts of Angiostrongylus costaricensis. In the laboratory, this nematode can be maintained in certain planorbids, which are aquatic mollusks and intermediate hosts of Schistosoma mansoni. Mollusks can be infected with Angiostrongylus costaricensis by ingestion of or active penetration by the first-stage larvae. In this work we assessed the ability of Biomphalaria glabrata to attract first-stage larvae of A. costaricensis. Movement of the nematode larvae towards the mollusks was observed after 15 min, 30 min and 1 h. B. glabrata did not attract the first-stage larvae of A. costaricensis in any of the three intervals. The susceptibility of two populations of Biomphalaria tenagophila to infection by A. costaricensis was also determined. One population was genetically selected for the susceptibility to S. mansoni while the other was not. Third-stage larvae were recovered from the snails 30 days after exposure of the two populations to 120 first-stage larvae. All the mollusks were infected. However, a significantly higher number of third-stage larvae were recovered in mollusks not genetically selected.

scholarly journals Development of Schistosoma mansoni in Biomphalaria tenagophila, Biomphalaria straminea and Biomphalaria glabrata

1995 ◽  
Vol 37 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Cecilia Pereira de Souza ◽  
Rita de Cássia Palma Cunha ◽  
Zilton A. Andrade
Keyword(s):  
Comparative Study ◽  
Schistosoma Mansoni ◽  
Digestive Gland ◽  
Biomphalaria Glabrata ◽  
Histological Sections ◽  
Defense Systems ◽  
Biomphalaria Straminea ◽  
Tissue Reactions ◽  
Digestive Glands

A comparative study of the development of Schistosoma mansoni during the intra-molluscan phase was made by means of histological sections of Biomphalaria tenagophila, B. straminea and B. glabrata from Brazil. Two hundred snails of each species were individually exposed to 50 miracidia of the S. mansoni, AL line. No larvae were observed in the snails fixed 72 h after exposure. In specimens shedding cercariae, 31 days after exposure tissue reactions encapsulating the larvae were seen in B. tenagophila and B. straminea, in the head-foot, mantle collar and renal ducts. No tissue reactions occurred in the digestive glands of these two species. In B. glabrata the presence of numerous sporocysts and cercariae without tissue reactions was observed in the digestive gland, and other organs. The levels of infection of the snails and the average numbers of cercariae shed per day were 32.6% and 79±90 respectively for B. tenagophila, 11.3% and 112±100 for B. straminea and 75.3% and 432±436 for B. glabrata. The lower levels of infection and average numbers of cercariae shed by B. tenagophila and B. straminea are thus related to their more potent internal defense systems.

scholarly journals Observations on two biological races of Schistosoma mansoni

1981 ◽  
Vol 76 (3) ◽  
pp. 287-291 ◽  
Author(s):  
W. Lobato Paraense ◽  
Lygia R. Corrêa
Keyword(s):  
Comparative Study ◽  
Schistosoma Mansoni ◽  
Biomphalaria Glabrata ◽  
Prepatent Period ◽  
Snail Species ◽  
Infection Rates ◽  
Paulo State ◽  
Minas Gerais State ◽  
Belo Horizonte ◽  
Host Parasite

A comparative study of the BH strain of Schistosoma mansoni from Belo Horizonte, Minas Gerais state, infective to Biomphalaria glabrata from the same locality, and the SJ strain from São José dos Campos, São Paulo state, infective to B. tenagophila from the latter locality, showed the following differences: 1. Length of adult worms and size of eggs significantly larger in the BH strain. 2. Higher infection rates in the B. glabrata-BH strain association than in the B. tenagophila-SJ strain association, following exposure of each snail to 1 or 10 miracidia. 3.Longer prepatent period (from penetration of miracidium to first shedding of cercariae) in the B. tenagophila-SJ strain association. 4. Infection of both Biomphalaria species when exposed to hybrid miracidia from crosses between the two strains, at lower levels than those resulting from exposure of each snail species to miracidia of the pure sympatric strain. (Both Biomphalaria populations are practically refractory to infection with the allopatric strain). These results are interpreted as pointing to a better host-parasite adjustment in the B. glabrata-BH strain association than in the B. tenagophila-SJ association. The interfertility between the two strains, which produced viable hybrids infective to both Biomphalaria species, supports the conclusion that the observed differences are merely intraspecific, and that the two strains may be considered distinct biological races of Schistosoma mansoni.

Schistosoma mansoni: Changes in the Albumen Gland of Biomphalaria glabrata Snails Selected for Nonsusceptibility to the Parasite

1995 ◽  
Vol 81 (6) ◽  
pp. 905 ◽  
Author(s):  
Carolyn Cousin ◽  
Kwame Ofori ◽  
Sandra Acholonu ◽  
Andre Miller ◽  
Charles Richards ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Biomphalaria Glabrata ◽  
Albumen Gland
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