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1Author    Z. NaturforschRequires cookie*
 Title    On the Pigmentation of the Pollen of  
 Abstract    N o th o fa ­ g u s a n ta rc tic a (Forst.) Oerst. (Fagaceae) E ckhard W ollenw eber Extraction o f pollen o f N othofagus antarctica with acid hydrolysis yields kaem pferol, quercetin, the rare flavonol sexangularetin, and naringenin. The tetrahydroxy-chalcone isosalipurpol is shown for the first tim e to occur in such high amount as free aglycone in mature pollen; it yields na­ ringenin in usual extraction procedures. The bright yellow coloration o f the pollen is due to the presence o f isosalipur­ pol and sexangularetin. 
  Reference    Z. Naturforsch. 34c, 1289 (1979); received Septem ber 4 1979 
  Published    1979 
  Keywords    Nothofagus antarctica, Fagaceae, Pollen, Pigmentation, Rare Flavonoids 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-1289_n.pdf 
 Identifier    ZNC-1979-34c-1289_n 
 Volume    34 
2Author    Susanne Herminghaus, Sabine Gubatz, Sibylle Arendt, Rolf WiermannRequires cookie*
 Title    The Occurrence of Phenols as Degradation Products of Natural Sporopollenin — a Comparison with "Synthetic Sporopollenin"  
 Abstract    1. A highly purified sporopollenin fraction from Corylus avellana pollen was obtained using a gentle method employing hydrolyzing enzymes (pronase, lipase, cellulase, amylase, cellulysin) and an exhaustive extraction using different solvents. 2. The sporopollenin fractions were degraded by potash-fusion and nitrobenzene oxidation and the low molecular decomposition products were analyzed by TLC and HPLC. The investigation centered solely on the proof of phenolic compounds. 3. The degradation by potash-fusion yielded/7-hydroxybenzoic acid as a main component, while the degradation by nitrobenzene oxidation (NBO) resulted in the formation of /7-hydroxybenzal-dehyde as the main component. In addition phenolic components such as p-coumaric acid, ferulic acid, vanillin and vanillic acid were formed to different degrees by using NBO as degradation procedure. 4. A comparison of the products formed following degradation of Corylus sporopollenin and "synthetic sporopollenin" shows, that phenolic compounds, if they indeed occurred as degrada-tion products of "synthetic sporopollenin", are generated only in extremely small quantities. It appears that, in contrast to several reports in the literature, phenols are integral constituents of natural sporopollenin. This view is supported by unpublished tracer experiments. 
  Reference    Z. Naturforsch. 43c, 491—500 (1988); received December 23 1987 
  Published    1988 
  Keywords    Corylus avellana L, Betulaceae, Pollen, Sporopollenin Phenols 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0491.pdf 
 Identifier    ZNC-1988-43c-0491 
 Volume    43 
3Author    Rolf Wiermann, Eckhard Wollenweber, Cornelia RehseRequires cookie*
 Title    "Yellow Flavonols" as Components of Pollen Pigmentation  
  Reference    Z. Naturforsch. 36c, 204—2 (1981); received December 5 1980 
  Published    1981 
  Keywords    Paeonia, Rumex, Spinacea oleracea, Pollen, Pigmentation, "Yellow Flavonols" 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0204.pdf 
 Identifier    ZNC-1981-36c-0204 
 Volume    36 
4Author    SabineW. Ilm Esm Eier3, Stefan Steuernagelb, R. O. Lf, W. IermRequires cookie*
 Title    Comparative FTIR and 13C CP/MAS NMR Spectroscopic Investigations on Sporopollenin of Different Systematic Origins  
 Abstract    Comparative phytochemical investigations were carried out on sporopollenins of the follow­ ing plant species: Bryophyta -Reboulia hemisphaerica and Polytrichum strictum; Pteridophyta -Equisetum arvense, Selaginella selaginoides micro-and megaspores; Gymnospermae -Cycas circinalis; Angiospermae -Typha angustifolia and Tulipa cv. "Apeldoorn". Although the range of the analyses included species from the Bryophyta to the Angiospermae, fundamen­ tal correspondences could be detected in the 13C NMR and FTIR spectra concerning the occur­ rence of aliphatics, aromatics, ether and carbonyl/carboxylic functions in varying degrees. While the amount of aliphatics strongly dominated in the molecular structure of all other sporopollenins investigated here, it was found in sporopollenin of Equisetum arvense in a much lower extent. Despite the different morphology of Selaginella selaginoides micro-and mega­ spores, their sporopollenin spectra were nearly identical. 
  Reference    Z. Naturforsch. 48c, 697—701 (1993); received June 181993 
  Published    1993 
  Keywords    Sporopollenin, Pollen, Microspores, Megaspores, FTIR Spectroscopy, 13C NMR Spectroscopy 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0697.pdf 
 Identifier    ZNC-1993-48c-0697 
 Volume    48 
5Author    M.C M Arcucci, F. A. De, C. Am Argo, C.M A LopesRequires cookie*
 Title    Identification of Amino Acids in Brazilian Propolis  
 Abstract    A m ino acids o f propolis samples from different origins were analysed and quantified. Seven of them presented almost the same percentage in all samples, indicating that bees may have obtained amino acids from three sources: plants, pollen contamination and from their own metabolism. The regeneration properties of propolis in relation to the presence of som e amino acids are discussed. 
  Reference    Z. Naturforsch. 51c, 11 (1996); received March 27/O ctober 12 1995 
  Published    1996 
  Keywords    Propolis, A m ino Acids, Pollen, Plant Sources, Regenerative Properties 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0011.pdf 
 Identifier    ZNC-1996-51c-0011 
 Volume    51