Linked Life Data

16666552

Source:http://linkedlifedata.com/resource/pubmed/id/16666552

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2010-6-29
pubmed:abstractText
The aim of this study was to determine how Chondrus crispus, a marine red macroalga, acquires the inorganic carbon (C(i)) it utilizes for photosynthetic carbon fixation. Analyses of C(i) uptake were done using silicone oil centrifugation (using multicellular fragments of thallus), infrared gas analysis, and gas chromatography. Inhibitors of carbonic anhydrase (CA), the band 3 anion exchange protein and Na(+)/K(+) exchange were used in the study. It was found that: (a) C. crispus does not accumulate C(i) internally above the concentration attainable by diffusion; (b) the initial C(i) fixtion rate of C. crispus fragments saturates at approximately 3 to 4 millimolar C(i); (c) CA is involved in carbon uptake; its involvement is greatest at high HCO(3) (-) and low CO(2) concentration, suggesting its participation in the dehydration of HCO(3) (-) to CO(2); (d) C. crispus has an intermediate C(i) compensation point; and (e) no evidence of any active or facilitated mechanism for the transport of HCO(3) (-) was detected. These data support the view that photosynthetic C(i) uptake does not involve active transport. Rather, CO(2), derived from HCO(3) (-) catalyzed by external CA, passively diffuses across the plasma membrane of C. crispus. Intracellular CA also enhances the fixation of carbon in C. crispus.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jan
pubmed:issn
0032-0889
pubmed:author
pubmed:issnType
Print
pubmed:volume
89
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
93-9
pubmed:dateRevised
2010-9-15
pubmed:year
1989
pubmed:articleTitle
Mechanism of Photosynthetic Carbon Dioxide Uptake by the Red Macroalga, Chondrus crispus.
pubmed:affiliation
Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada.
pubmed:publicationType
Journal Article