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1995 (1)
1981 (1)
1Author    Sedat Imrea, Zeynep Aydoğmuşa, Hüseyin Günerb, Hermann Lotterc, Hildebert WagnercRequires cookie*
 Title    Polybrominated Non-Terpenoid C15 Compounds from Laurencia paniculata and Laurencia obtusa  
 Abstract    Two polybrom inated C 15-acetogenins (1,2) isolated from a M editerranean sponge pre­ viously and a new polybrominated bicyclic ether with a bromoallenic side chain (3) were isolated from Laurencia paniculata and Laurencia obtusa respectively. The structures of these compounds were elucidated by spectroscopic methods. 
  Reference    Z. Naturforsch. 50c, 743—747 (1995); received June 12/September 6 1995 
  Published    1995 
  Keywords    Laurencia paniculata, Laurencia obtusa, Rhodomelaceae, Red Alga, Marine Natural Products 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0743.pdf 
 Identifier    ZNC-1995-50c-0743 
 Volume    50 
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