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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2 Pt 2
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pubmed:dateCreated |
1998-3-17
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pubmed:abstractText |
The oral epithelial layers of anthozoans have a polarized morphology: photosynthetic endosymbionts live within endodermal cells facing the coelenteric cavity and are separated from the external seawater by the ectodermal layer and the mesoglea. To study if this morphology plays a role in the supply of inorganic carbon for symbiont photosynthesis, we measured the change in pH and the rate of OH- (H+) fluxes induced by each cell layer on a tentacle of the sea anemone Anemonia viridis. Light-induced pH increase of the medium bathing the endodermal layers led to the generation of a transepithelial pH gradient of approximately 0.8 pH units across the tentacle, whereas darkness induced acidification of this medium. The light-induced pH change was associated with an increase of total alkalinity. Only the endodermal layer was able to induce a net OH- secretion (H+ absorption). The light-induced OH- secretion by the endodermal cell layer was dependent on the presence of HCO3- in the compartment facing the ectoderm and was sensitive to several inhibitors of ion transport. [14C] HCO3- incorporation into photosynthates confirmed the ectodermal supply, the extent of which varied from 25 to > 90%, according to HCO3- availability. Our results suggest that the light-induced OH- secretion by the endodermal cell layer followed the polarized transport of HCO3- and its subsequent decarboxylation within the endodermal cell layer. This polarity may play a significant role both in inorganic carbon absorption and in the control of light-enhanced calcification in scleractinian corals.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Amiloride,
http://linkedlifedata.com/resource/pubmed/chemical/Bicarbonates,
http://linkedlifedata.com/resource/pubmed/chemical/Carbon,
http://linkedlifedata.com/resource/pubmed/chemical/Hydroxides,
http://linkedlifedata.com/resource/pubmed/chemical/Oxygen,
http://linkedlifedata.com/resource/pubmed/chemical/Sodium
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pubmed:status |
MEDLINE
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pubmed:month |
Feb
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pubmed:issn |
0002-9513
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
274
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
R303-10
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:9486285-Amiloride,
pubmed-meshheading:9486285-Animals,
pubmed-meshheading:9486285-Bicarbonates,
pubmed-meshheading:9486285-Carbon,
pubmed-meshheading:9486285-Endoderm,
pubmed-meshheading:9486285-Hydrogen-Ion Concentration,
pubmed-meshheading:9486285-Hydroxides,
pubmed-meshheading:9486285-Kinetics,
pubmed-meshheading:9486285-Light,
pubmed-meshheading:9486285-Oxygen,
pubmed-meshheading:9486285-Photosynthesis,
pubmed-meshheading:9486285-Sea Anemones,
pubmed-meshheading:9486285-Sodium
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pubmed:year |
1998
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pubmed:articleTitle |
Functional polarity of the tentacle of the sea anemone Anemonia viridis: role in inorganic carbon acquisition.
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pubmed:affiliation |
Observatoire Océanologique Européen, Centre Scientifique de Monaco, Principality of Monaco.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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