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1996 (1)
1978 (1)
1Author    Hans-Ulrich Meisch, Wolfgang Reinle, Bernd-Arwed RichterRequires cookie*
 Title    Zur Frage biogener Anreicherungen von Vanadium und Nickel in Pflanzen des Karbonzeitalters The Question of Biogenous Enrichments of Vanadium and Nickel in Plants of the Carbon Age  
 Abstract    O riginal carbonaceous m aterial of fossile carbon plants from the divisions of the Equisetophyta (Calam ariaceae), Lycophyta (Lepidodendraceae, S igillariacea e), Filicophyta (F ilicatae), and Sper-matophyta (Pteridospermatae, Cordaitidae) was analyzed by atomic absorption spectroscopy on its content of the trace metals vanadium and nickel. The average V-content was found to be 1 0 to 100 fold higher than that of the neighbouring coal beds or that of the embedding materials, while the Ni-concentrations were found to be almost in the same range. The highest contents of V and N i were found in the Calamariaceae and in the Pteridospermatae. The V-and Ni-contents of the fossile carbon plants are compared to those of related recent plant genera (clubmosses, horse­ tails, fern s), which were analyzed by 46 representative samples. A possible biogenous enrichment of V and N i in plants of the carbon age is discussed. 
  Reference    Z. Naturforsch. 33c, 616 (1978); eingegangen am 7. Juni/21. Juni 1978 
  Published    1978 
  Keywords    Vanadium, Nickel, Carbon, Carbon Plants, Ferns, Horsetails, Clubmosses 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0616.pdf 
 Identifier    ZNC-1978-33c-0616 
 Volume    33 
2Author    HermanJ W Oerdenbag3, L. R. En Ee, L. U. Tkea, ReinB., JanF. Sa, Stevens3, Ron Hulstb, WimH. Kruizingab, You-Ping Zhuc, ElizabethT E Lem A3, Henk Hendriks3, Wim Van, U. Den3, Niesko Pras3Requires cookie*
 Title    Isolation of Two Cytotoxic Diterpenes from the Fern Pteris multifida  
 Abstract    From aerial parts of the fern Pteris multifida Poir. (Polypodiaceae) two diterpenes, ent-kaurane-2ß,16a-diol and e«f-kaur-16-ene-2ß,15a-diol, were isolated by repeated column chromatography using silica gel and silica gel impregnated with silver nitrate. The structures were confirmed by spectroscopic methods. Both compounds showed a moderate cytotoxicity to Ehrlich ascites tumour cells. 
  Reference    Z. Naturforsch. 51c, 635 (1996); received March 6 /M ay 28 1996 
  Published    1996 
  Keywords    Pteris multifida, Polypodiaceae, Ferns, £>zf-kaurane Diterpenes, Cytotoxic Activity 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0635.pdf 
 Identifier    ZNC-1996-51c-0635 
 Volume    51