Linked Life Data

1889412

Source:http://linkedlifedata.com/resource/pubmed/id/1889412

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1991-10-15
pubmed:abstractText
We have followed the dynamic evolution of intracellular pH and of the intracellular concentration of nucleotides (NDP, NTP), Pi and lactate in maize root tips during the course of normoxia and anoxia transition. The intracellular pH, determined from the 31P-NMR chemical shift of the cytoplasmic P1 peak, dropped from 7.5 to 6.9 during the first few minutes after anaerobiosis. It increased again, then settled to a steady-state value of 7.1-7.2, 25 min after the beginning of the anoxic treatment. Following oxygenation, the chemical shift of the cytoplasmic Pi peak drifted gradually to its initial value. The cytoplasmic pH followed an oscillatory time course which was almost identical to the time course of NTP. Intracellular lactate accumulated steadily during the first 30 min after anaerobiosis, then its intracellular concentration remained almost constant. Following oxygenation, the intracellular concentration of lactate decreased slowly. The cytoplasmic pH followed a time course which was not identical to the time course of lactate. Following hypoxia, the pH dropped to low values long before the intracellular lactate concentration reached a steady-state equilibrium. Conversely, subsequent to oxygenation, the pH returned to normal values long before lactate. These results do not agree with the statement that cytoplasmic acidification in hypoxic maize root tips is necessarily associated with lactic acid synthesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
200
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
477-82
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Kinetic studies of the variations of cytoplasmic pH, nucleotide triphosphates (31P-NMR) and lactate during normoxic and anoxic transitions in maize root tips.
pubmed:affiliation
Institut National de la Recherche Scientifique, Centre de Recherche de Bordeaux, France.
pubmed:publicationType
Journal Article