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'Carotenoids' in keywords Facet   Publication Year 1979  [X]
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Publication Year
1979[X]
1Author    B. Johannes, H. Brzezinka, H. BudzikiewiczRequires cookie*
 Title    Mass Spectroscopic Fragmentation Reactions, XXI [1] Factors Influencing the Loss of Xylene and Toluene from the Polyene Chain of Carotenoids  
 Abstract    By examining suitably substituted analogs of carotenoids the steric and electronic influences governing the elimination of xylene and toluene from the polyene chain have been clarified. 
  Reference    Z. Naturforsch. 34b, 300—305 (1979); received November 7 1978 
  Published    1979 
  Keywords    MS, Analysis, Carotenoids, Polyene Chain 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0300.pdf 
 Identifier    ZNB-1979-34b-0300 
 Volume    34 
2Author    K.H G Rum BachRequires cookie*
 Title    Evidence for the Existence of Two ^-Carotene Pools and Two Biosynthetic ^-Carotene Pathways in the Chloroplast  
 Abstract    Two /7-Carotene pools were obtained in the chloroplast. It is concluded that one pool is very small like a-carotene and responsible exclusively for the biosynthesis of /?-ionone-xanthophylls. The other ^-carotene pool is proposed to be the one, that is located close to photosystem I and is involved in photosynthesis as a light protecting agent for chlorophylls against photo-oxidation. Furtherm ore evidence is given that both /7-carotene pools are synthesized by independent biosyn­ thetic pathways. 
  Reference    Z. Naturforsch. 34c, 1205 (1979); received Septem ber 4 1979 
  Published    1979 
  Keywords    Biosynthesis, Carotenoids, /?-Carotene, Photosynthesis 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1205.pdf 
 Identifier    ZNC-1979-34c-1205 
 Volume    34 
3Author    N. Orbert, A. Dencher, Eilo HildebrandRequires cookie*
 Title    Sensory Transduction in Halobacterium halobium: Retinal Protein Pigment Controls UV-Induced Behavioral Response  
 Abstract    Both photosystems, PS 370 and PS 565, controlling behavioral responses in H alobacterium halo-bium [E. Hildebrand and N. Dencher, Nature 2 5 7 ,4 6 — 48 (1975)] are reversibly inhibited when bacteria are grown in the presence o f 1 mM nicotine which is known to block biosynthesis o f reti­ nal. Photobehavior can be restored within som e minutes to hours by adding retinal to nicotine-treated bacteria, PS 370 thereby reappearing earlier than PS 565. The reconstitution rate depends on the concentration and on the kind o f retinal isomers applied. A \\-trans retinal is m ost effective. PS 370 becomes fully sensitive if reconstituted in the presence o f nicotine. This rules out the possi­ bility that the alkaloid may directly inhibit steps o f signal transmission follow ing photoreception. The action spectrum o f PS 370 regenerated with retinal alone o f H. h., strain RjLg (a mutant deficient in carotenoids), fails to show all secondary peaks around 450 nm which in strain Rj occur besides the prominent maximum at 370 nm. A ddition o f carotenoids (m ainly a-bacterioruberin) to reconstituted cells o f R ,L3 restores the sensitivity in that spectral region. Carotenoids or flavin solely added to nicotine-treated bacteria cannot restore photobehavior. We conclude that the active pigm ent o f PS 370, which m ediates the photophobic response to increase o f light intensity (step-up response), represents a retinal protein com plex and that carote­ noids participate in photoreceptor function as accessory pigments. The biochem ical relation o f the UV-absorbing retinal protein com plex to bacteriorhodopsin is discussed. 
  Reference    Z. Naturforsch. 34c, 841 (1979); received June 5/July 6 1979 
  Published    1979 
  Keywords    Bacteria, Photophobic Response, Bacteriorhodopsin, Carotenoids, Accessory Pigment 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0841.pdf 
 Identifier    ZNC-1979-34c-0841 
 Volume    34 
4Author    Karl-JosefK. Unert, Peter BögerRequires cookie*
 Title    Influence of Bleaching Herbicides on Chlorophyll and Carotenoids  
 Abstract    Over 24 and 48 hour cultivation periods the influence of SAN 9789 (norflurazon), EMD-IT 5914 (difunon) and fluridone on growth, photosynthetic oxygen evolution and pigment content of the green alga Scenedesmus acutus was determined. Four effects were observed: a) Both carotenoid and chlorophyll formation were inhibited. b) Carotenoids were destroyed in the presence of air, but not nitrogen. The level of chlorophyll, however, did not change. c) ß-(and a-) carotene was markedly decreased in the presence of oxygen. d) Photosynthetic oxygen evolution was decreased with the disappearance of carotenoids. These effects, which are accompanied by reduced growth, are believed to represent primary herbicidal modes of action. The decrease of oxygen evolution is not due to a direct inhibition of photosynthetic electron transport by the herbicides applied. 
  Reference    Z. Naturforsch. 34c, 1047 (1979); received June 30 1979 
  Published    1979 
  Keywords    Bleaching Herbicides, Algae, Scenedesmus acutus, Carotenoids, Chlorophyll, Air/Nitrogen Gassing 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1047.pdf 
 Identifier    ZNC-1979-34c-1047 
 Volume    34 
5Author    K. H. Grumbach, T. J. BachRequires cookie*
 Title    The Effect of PS II Herbicides, Amitrol and SAN 6706 on the Activity of 3-Hydroxy-3-methylglutaryl-coenzyme-A-reductase and the Incorporation of [2-14C]Acetate and [2-3H]Mevalonate into Chloroplast Pigments of Radish Seedlings  
  Reference    Z. Naturforsch. 34c, 941 (1979); received June 5 1979 
  Published    1979 
  Keywords    DC M U, Bentazone, SAN 6706, Am itrol, Chlorophylls, Carotenoids, HM G-CoA-Reductase 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0941.pdf 
 Identifier    ZNC-1979-34c-0941 
 Volume    34