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1990 (1)
1982 (1)
1Author    Helmut FormanekRequires cookie*
 Title    Possible Orientation of the Fatty Acid Chains in Lipopolysaccharide  
 Abstract    The fatty acid chains of the lipid A component of lipopolysaccharides are hexagonally packed with a lattice periodicity of 4.1 A. The smallest subunit o f this lattice consists of a disaccharide to which seven fatty acid chains are linked representing the hydrophobic part. Carbohydrates and substituted phosphate residues linked to them form the hydrophilic part o f the molecule. Because of sterical reasons and because of the necessity o f a separation of hydrophobic and hydrophilic part, we could derive that the angles o f the hydrocarbon chains with the planes of the two sugar residues should be as vertical as possible and the planes o f both sugar residues should be approximately coplanar forming an angle o f about 180° with one another. Conformation angles for all the theoretically possible linkages o f the disaccaride and of the linkages of the fatty acid residues have been calculated. Between the two-N-acylglucosamine residues theoretically /?-l,4, a -1,6 or /?-l,6 linkages are possible. The experimentally found ß-\,6 linkage has the largest degrees of freedom for its conformation angles. 
  Reference    Z. Naturforsch. 37c, 428 (1982); received March 1 1982 
  Published    1982 
  Keywords    Lipopolysaccharide, Hydrocarbon Chains, Orientation 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0428.pdf 
 Identifier    ZNC-1982-37c-0428 
 Volume    37 
2Author    Peter Witzgall, Heinrich ArnRequires cookie*
 Title    Direct Measurement of the Flight Behavior of Male Moths to Calling Females and Synthetic Sex Pheromones  
 Abstract    The approach of male Lobesia botrana (Lepidoptera: Tortricidae) in the wind tunnel to a source of sex pheromone was studied using two video cameras connected to image processing equipment. Three-dimensional records demonstrate that the flight to calling females is quite direct compared to the zigzag flight reported for other species. Convoluted paths displaying bimodal distribution of track and course angles were only obtained with a synthetic phero­ mone blend consisting of £'-7,Z-9-dodecadienyl acetate, £'-7,Z-9-dodecadien-l-ol and Z-9-dodecenyl acetate at the proportions of 1 /0.2/0.05. This suggests that this blend is still subopti-mal and that zigzag flight may be due to a lack of precision in upwind motion caused by inade­ quate composition of the stimulus. 
  Reference    Z. Naturforsch. 45c, 1067—1069 (1990); received March 30/May 23 1990 
  Published    1990 
  Keywords    Sex Pheromone, Flight Behavior, Orientation, Anemotaxis, Lobesia botrana 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-1067.pdf 
 Identifier    ZNC-1990-45c-1067 
 Volume    45