Linked Life Data

9657382

Source:http://linkedlifedata.com/resource/pubmed/id/9657382

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1998-7-23
pubmed:abstractText
The origin of the '35-micros kinetics' of P680(+.) reduction in photosystem II (PS II) with an intact water oxidising complex has been analysed by comparative measurements of laser flash induced changes of the 830-nm absorption and the relative quantum yield of chlorophyll (Chl) fluorescence. The latter parameter was monitored at a time resolution of 500 ns by using newly developed home built equipment [Reifarth, F., Christen, G. and Renger, G. (1997) Photosynth. Res. 51, 231-2421. It was found that: (i) the amplitudes of the unresolved ns-kinetics of both 830-nm absorption changes and the rise of fluorescence yield exhibit virtually the same period four oscillation pattern when dark adapted samples are excited with a train of saturating laser flashes; (ii) the corresponding oscillation patterns of the normalised extent of the 35-micros kinetics under identical excitation conditions are strikingly different with maxima after the 3rd and 5th flash for the 830-nm absorption changes vs. pronounced maxima after the 4th and 8th flash for the rise of the fluorescence yield. The period four oscillations unambiguously show that the '35-micros kinetics' of P680(+.) reduction are characteristic for reactions in PS II entities with an intact water oxidising complex. However, the disparity of the oscillation patterns of (ii) indicates that in contrast to the ns components of P680(+.) reduction the 35-micros kinetics do not reflect exclusively an electron transfer from Y(Z) to P680(+.). It is inferred that a more complex reaction takes place which comprises at least two processes: (a) P680(+.) reduction by Y(Z) and (b) coupled and/or competing reaction(s) which give rise to additional changes of the chlorophyll fluorescence yield.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0014-5793
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
429
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
49-52
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
On the origin of the '35-mus kinetics' of P680(+.) reduction in photosystem II with an intact water oxidising complex.
pubmed:affiliation
Max-Volmer-Institute for Biophysical Chemistry and Biochemistry, Technical University Berlin, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't