Document Detail

Osmoregulation in the parasitic nematode Pseudoterranova decipiens.
MedLine Citation:
PMID:  8440971     Owner:  NLM     Status:  MEDLINE    
When subjected to hyper- or hypo-osmotic stress at 5 degrees C for 24 h, third-stage larvae of the parasitic nematode Pseudoterranova decipiens do not exhibit changes in mass or in the osmotic pressure of the pseudocoelomic fluid. Immersion in solutions containing 3H2O demonstrates that exchange with the water in the pseudocoelomic fluid is substantially complete within 24 h. Sacs composed of cylinders of body wall without the intestine and pseudocoelomic fluid do not gain weight when immersed for 24 h in hypotonic medium. Metabolic poisons abolish the ability of whole worms and sacs to maintain their weight when immersed in hypotonic media. These observations support the conclusion that the nematode is capable of at least short-term osmoregulation and that the site of osmoregulation is the body wall. The observations that more fluid is passed from the anus in some hypo-osmotically stressed worms and that worms ligatured at the tail exhibit a small increase in mass when exposed to hypo-osmotic conditions may indicate that the intestine plays a minor and subsidiary role in osmoregulation.
M Fusé; K G Davey; R I Sommerville
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  175     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  1993 Feb 
Date Detail:
Created Date:  1993-04-01     Completed Date:  1993-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  127-42     Citation Subset:  IM    
Department of Biology, York University, Ontario, Canada.
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MeSH Terms
Anal Canal / metabolism
Ascaridoidea / physiology*
Digestive System / metabolism
Osmolar Concentration
Water-Electrolyte Balance / physiology*

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