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'Lipid Phase Transition' in keywords Facet   section ZfN Section C  [X]
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1981 (1)
1975 (1)
1Author    Ulrich Schreiber, K. Onrad, Colbow\., WilliamV. IdaverRequires cookie*
 Title    Tem perature — Jump Chlorophyll F luorescence Induction in Plants  
 Abstract    In contrast to slower heating rates, a temperature jump reveals complex rise phases in the heat induced chlorophyll fluorescence emission increase in intact plants. Three rise phases have been detected which indicate the stepwise loss of different quenching mechanism of system II fluorescence. Two of the phases appear to reflect heat deactivation of the system II reaction centers, while the other may be as­ sociated with the induction of hydrogenase activity. Varia­ tions in T max of the jump, for the increase in different plant varieties, suggest a correlation with membrane lipid phase transitions affecting thylakoid membrane structure and the fluorescence increase. Chlorophyll fluorescence has been a valuable in ­ dicator for the state and functioning of the photo-synthetic apparatus (for a review, cf. ref. 1). 
  Reference    (Z. Naturforsch. 30c, 689—690 [1975]; received May 12 1975) 
  Published    1975 
  Keywords    Chlorophyll Fluorescence, Temperature Jump, Heat Deacti­ vation, Watersplitting, Enzyme System, Lipid Phase Transition 
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 TEI-XML for    default:Reihe_C/30/ZNC-1975-30c-0689_n.pdf 
 Identifier    ZNC-1975-30c-0689_n 
 Volume    30 
2Author    SeymourSteven BrodyRequires cookie*
 Title    Temperature Induced Changes in the Absorption Spectra of Porphyridium cruentum and Anacystis nidulans  
 Abstract    Cooling A. nidulans or P. cruentum from 26 °C to 4 °C results in progressive spectral changes. The most significant changes are increases in absorbance at 690 nm (photosystem II), 678 nm (antenna chlorophyll), 625 nm (phycocyanin), and 505 nm (electrochromic band). In the case o f P. cruentum there are also increases in absorbance at 568 and 545 nm (B-phycoerythrin) and a decrease at 587 nm. The spectral changes in both organisms are accompanied by decreases at 703 nm (photosystem I or aggregated chlorophyll), 650 nm (allophycocyanin) and 486 nm (carotenoid). Heating A. nidulans or P. cruentum from 4 °C to 44 °C results in increases in absorbance at 705 nm (photosystem I) and 486 nm (carotenoid), accompanied by decreases at 690 nm (photo­ system II), 676 nm (antenna chlorophyll), 628 nm (phycocyanin), 507 nm (electrochromic band) and 469 nm (carotenoid). In the case o f P. cruentum there are also decreases at 568 and 546 nm (B-phycoerythrin) and an increase at 587 nm. The possible origin o f the spectral change at 587 nm. The possible origin o f the spectral change at 587 nm is discussed. The spectral changes o f the chlorophyll bands (703, 690, 678 nm) and the electrochromic band (502 nm) are associated with phase changes of the lipid membrane. Lowering the temperature results in a decrease o f aggregated chlorophyll or photosystem I, and vice versa. These spectral changes are also observed in green chloroplasts. The spectral changes o f the phycobilins may originate from a temperature dependent change of the ion balance o f the thylakoid. A spectral change may result from the ensuring modification of the stacking or from an electrochromic effect. 
  Reference    Z. Naturforsch. 36c, 1013—1020 (1981); received September 141981 
  Published    1981 
  Keywords    Photosynthesis, Lipid Phase Transition, Blue-Green Algae, Red Algae, Change in Absorption, Phycobili Proteins, Chlorophyll 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-1013.pdf 
 Identifier    ZNC-1981-36c-1013 
 Volume    36