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'Light Quality' in keywords
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1993 (1)
1988 (1)
1Author    SamirS. Radwan, Adel-Salam Shaaban, HassanM. GebreelRequires cookie*
 Title    Arachidonic Acid in the Lipids of Marine Algae Maintained under Blue, White and Red Light  
 Abstract    Marine algae, maintained for one month under blue, white and red light were rather rich in lipids but obviously poor in fat (triacylglycerols). These lipids consisted predominantly of glyco-lipids and phospholipids. Irrespective of the light quality, the major constituent fatty acids in lipids of these algae were, in most cases, those with 20 carbon atoms. The light quality had a definite effect on the proportion of arachidonic acid in the lipids of certain algae. Thus, the proportion of arachidonic acid in Enteromorpha intestinalis maintained under white light was 45% and in Sargassum salicifolium kept under red light 25% of the total constituent fatty acids in the total algal lipids. 
  Reference    Z. Naturforsch. 43c, 15—18 (1988); received March 26/September 18. 1987 
  Published    1988 
  Keywords    Arachidonic Acid, Light Quality, Marine Algae, Prostaglandins 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0015.pdf 
 Identifier    ZNC-1988-43c-0015 
 Volume    43 
2Author    F. L. FigueroaRequires cookie*
 Title    Photoregulation of Nitrogen Metabolism and Protein Accumulation in the Red Alga Corallina elongata Ellis et Soland  
 Abstract    Reductase Red and blue light pulses of 5 min applied together with 45 (aM K N 0 3 stimulated the nitrate uptake and reduction and the assimilation of ammonium in darkness in the red alga Corallina elongata. N itrate reductase and glutamine synthetase activities were increased in darkness after the application of both red and blue light pulses. Red light produced a dram atic increase in enzyme activities after the first hour in darkness but after 4 h the effect of blue light pulses was greater. The photostim ulation of nitrogen metabolism was correlated with light-regulated accumulation of soluble proteins. Nitrogen incorporation, assimilation of am monium, accu­ m ulation of total proteins and the increment in total intracellular nitrogen was greater in N-limited algae (C :N = 17.3) than in N-sufficient algae (C :N = 10.3) after the application of light pulses and nitrate. Because the stimulant effects o f red and blue light on N-metabolism were partially reversed by far-red light, the possible involvement o f the photoreversible red/ far-red photoreceptor, phytochrom e, is proposed. In addition, the blue-light effect seems to be mediated by a specific B-light photoreceptor besides phytochrome due to the different time course of the response and the extent of the stimulation after blue compared to red light pulses. 
  Reference    Z. Naturforsch. 48c, 788—794 (1993); received June 15/ 
  Published    1993 
  Keywords    Blue-Light Photoreceptor, Corallina elongata, Glutamine Synthetase, Light Quality, N itrate 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0788.pdf 
 Identifier    ZNC-1993-48c-0788 
 Volume    48