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1997 (1)
1985 (1)
1Author    P. Eter Proksch, M. Argareta Proksch, W. Altraud Weck, Eloy RodriguezRequires cookie*
 Title    Localization of Chromenes and Benzofurans in the Genus Encelia (Asteraceae)  
 Abstract    Phytochemical and microscopial analysis of leaves and stems of various species of Encelia showed a strict correlation between the presence of resin ducts and the accumulation of benzopy­ rans and benzofurans. Fluorescence microscopy of Encelia farinosa proved unambigously that these compounds are stored exclusivly in the resin ducts and the surrounding cells. 
  Reference    Z. Naturforsch. 40c, 301 (1985); received December 18 1984 
  Published    1985 
  Keywords    Encelia, Asteraceae, Benzofurans and Benzopyrans, Localization, Resin Ducts 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0301.pdf 
 Identifier    ZNC-1985-40c-0301 
 Volume    40 
2Author    Eckhard Wollenweber3, StephenL. BuchmannbRequires cookie*
 Title    Feral Honey Bees in the Sonoran Desert: Propolis Sources other than Poplars (Populus spp.)  
 Abstract    In Central Europe and other temperate regions the lipophilic bee hive product propolis normally originates from the bud exudate of poplar trees that is collected by the bees. Based on bee observations, various other sources have been discussed in particular for tropical regions, but in only few cases the origin has been proved by analytical methods. We have analyzed propolis samples from managed honey-bees as well as from feral bee colonies in the Sonoran Desert. Propolis collected in hives out of flight reach of poplars contained flavonoid aglycones and other phenolics that point to specific plants as the source of propolis in this area, namely Ambrosia deltoidea and Encelia farinosa. 
  Reference    Z. Naturforsch. 52c, 530—535 (1997); received April 25 1997 
  Published    1997 
  Keywords    Apis mellifera, Feral Bees, Sonoran Desert, Propolis, Plant Source, Ambrosia, Encelia, Resinous Exudates 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0530.pdf 
 Identifier    ZNC-1997-52c-0530 
 Volume    52