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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
1
|
| pubmed:dateCreated |
1969-2-7
|
| pubmed:abstractText |
The fluorescence transient of Chlorella pyrenoidosa, excited by saturating blue light, has a base level O, hump I, dip D, peak P, and at 1.5 sec a quasi-steady level S (12). With 2 sec exciting exposures and 4 min dark periods, preillumination-1 (lambda >/= 690 nm, intensities 1-750 ergs/sec-cm(2) incident), replacing the dark periods, lowers I more effectively than preillumination-2 (650 nm </= lambda </= 680 nm) in both aerobic and anaerobic cells. Results indicate that the intersystem electron transport pool A as well as the primary electron acceptor of pigment system II Q (fluorescence quencher) is normally being reduced at I. Preillumination-1 lowers and delays P. Preillumination-2 (absorbed by both pigment systems) also lowers P, but delays P only at low intensity; at high intensity it hastens P. Preillumination-1 raises S while preillumination-2 lowers S. With 30 instead of 2 sec exciting light exposures, preillumination-1 causes a large S increase, and at low intensity a P increase. The S effects seem to be of a long-term nature (26-29) rather than rapid changes in the redox state of Q. As exciting light intensity increases, fluorescence yield at P increases three-fold maximally. The ratio of P (anaerobic) to O (aerobic) is 5.5. These high ratios restrict the Franck-Rosenberg model of photosynthesis (13), which is based on fluorescence yield doubling.
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| pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-13828632,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-14017395,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-14212275,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-14270543,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-14404931,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-16655202,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5638387,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5696213,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5696214,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5727378,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5833395,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5833396,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5961106,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5965267,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5966922,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-5969947,
http://linkedlifedata.com/resource/pubmed/commentcorrection/5782893-6048849
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| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Jan
|
| pubmed:issn |
0006-3495
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
9
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
22-35
|
| pubmed:dateRevised |
2010-11-18
|
| pubmed:meshHeading | |
| pubmed:year |
1969
|
| pubmed:articleTitle |
Light-induced changes in the fluorescence yield of chlorophyll A in vivo. IV. The effect of preillumination on the fluorescence transient of Chlorella pyrenoidosa.
|
| pubmed:publicationType |
Journal Article
|