Matches in SemOpenAlex for { <https://semopenalex.org/work/W2023805648> ?p ?o ?g. }
Showing items 1 to 66 of
66
with 100 items per page.
- W2023805648 endingPage "224" @default.
- W2023805648 startingPage "220" @default.
- W2023805648 abstract "Plastoquinone PQ is engaged in photosynthesis 1 . Difference spectra in the UV-region indicate that PQ is an intermediate in the electron transport chain 2 . PQ is located as a pool between the two light reactions I and II 3 . PQ is reduced by hν II and oxidized by hν I 3 . In this paper the difference spectra which occur during light excitation of spinach chloroplasts and chlorella vulgaris were measured in the UV-region with high resolution by the high sensitive method of periodical flash photometry 6 . On excitation with long flashes (10 —1 sec) the difference spectra are similar to those obtained when plastoquinone is reduced to hydroquinone in vitro (see figs. 1, 3 and 6). Deviations in the case of chlorella (fig. 4) are caused by additional NADP-reduction. After extraction of plastoquinone from chloroplasts the difference spectra do not occur during light excitation but they can be produced in full after reconstitution with synthetic plastoquinone A (see fig. 2). In the presents of far red background light (718 nm) which excites only light reaction I the magnitude of the spectrum is doubled (see fig. 3). By excitation with short flashes (10 —5 sec), two different spectra were found. The difference spectrum with a life-time of 5 · 10 —4 sec (fig. 7) is new and does not correspond to that of plastoquinone in vitro. The difference spectrum with a life-time of about 2·10 —2 sec (fig. 5) corresponds to the plastoquinone reduction. The magnitude of this spectrum is ten times smaller than that obtained by excitation with long flashes (fig. 6). The 1:10 ratio of the magnitude of the spectra in short and long flashes can be interpreted by a pool of plastoquinone between the two light reactions with a dynamic capacity of ten electrons. The doubled magnitude of the spectra in far red background light can be interpreted by an electron acceptor pool for plastoquinone with a capacity of five electrons (see also the following papers)." @default.
- W2023805648 created "2016-06-24" @default.
- W2023805648 creator A5060019049 @default.
- W2023805648 creator A5077187892 @default.
- W2023805648 date "1968-02-01" @default.
- W2023805648 modified "2023-10-16" @default.
- W2023805648 title "Die kurzzeitigen ultravioletten Differenzspektren bei der Photosynthese" @default.
- W2023805648 doi "https://doi.org/10.1515/znb-1968-0217" @default.
- W2023805648 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/4385977" @default.
- W2023805648 hasPublicationYear "1968" @default.
- W2023805648 type Work @default.
- W2023805648 sameAs 2023805648 @default.
- W2023805648 citedByCount "127" @default.
- W2023805648 countsByYear W20238056482019 @default.
- W2023805648 crossrefType "journal-article" @default.
- W2023805648 hasAuthorship W2023805648A5060019049 @default.
- W2023805648 hasAuthorship W2023805648A5077187892 @default.
- W2023805648 hasBestOaLocation W20238056481 @default.
- W2023805648 hasConcept C101692577 @default.
- W2023805648 hasConcept C104317684 @default.
- W2023805648 hasConcept C113196181 @default.
- W2023805648 hasConcept C121332964 @default.
- W2023805648 hasConcept C1276947 @default.
- W2023805648 hasConcept C183688256 @default.
- W2023805648 hasConcept C185592680 @default.
- W2023805648 hasConcept C2779515454 @default.
- W2023805648 hasConcept C43617362 @default.
- W2023805648 hasConcept C4839761 @default.
- W2023805648 hasConcept C55493867 @default.
- W2023805648 hasConcept C69305403 @default.
- W2023805648 hasConcept C75473681 @default.
- W2023805648 hasConceptScore W2023805648C101692577 @default.
- W2023805648 hasConceptScore W2023805648C104317684 @default.
- W2023805648 hasConceptScore W2023805648C113196181 @default.
- W2023805648 hasConceptScore W2023805648C121332964 @default.
- W2023805648 hasConceptScore W2023805648C1276947 @default.
- W2023805648 hasConceptScore W2023805648C183688256 @default.
- W2023805648 hasConceptScore W2023805648C185592680 @default.
- W2023805648 hasConceptScore W2023805648C2779515454 @default.
- W2023805648 hasConceptScore W2023805648C43617362 @default.
- W2023805648 hasConceptScore W2023805648C4839761 @default.
- W2023805648 hasConceptScore W2023805648C55493867 @default.
- W2023805648 hasConceptScore W2023805648C69305403 @default.
- W2023805648 hasConceptScore W2023805648C75473681 @default.
- W2023805648 hasIssue "2" @default.
- W2023805648 hasLocation W20238056481 @default.
- W2023805648 hasLocation W20238056482 @default.
- W2023805648 hasOpenAccess W2023805648 @default.
- W2023805648 hasPrimaryLocation W20238056481 @default.
- W2023805648 hasRelatedWork W1604152684 @default.
- W2023805648 hasRelatedWork W2013946324 @default.
- W2023805648 hasRelatedWork W2028510531 @default.
- W2023805648 hasRelatedWork W2041421627 @default.
- W2023805648 hasRelatedWork W2044190275 @default.
- W2023805648 hasRelatedWork W2132777559 @default.
- W2023805648 hasRelatedWork W4205521469 @default.
- W2023805648 hasRelatedWork W4244523634 @default.
- W2023805648 hasRelatedWork W4382121827 @default.
- W2023805648 hasRelatedWork W2978120121 @default.
- W2023805648 hasVolume "23" @default.
- W2023805648 isParatext "false" @default.
- W2023805648 isRetracted "false" @default.
- W2023805648 magId "2023805648" @default.
- W2023805648 workType "article" @default.