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Endogenous cytokinins during embryogenesis in an anise cell culture (Pimpinella anisum L.) (1984)

Ernst, D. ; Oesterhelt, D. ; Schäfer, W.

Springer

Planta 161 (1984), S. 240-245

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ISSN: 1432-2048

Keywords: Cell culture ; Cytokinin and embryogenesis ; Embryonic/proembryonic development ; Pimpinella

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Endogenous levels of cytokinins in an anise cell culture were determined by the use of radioimmunoassay and gas chromatography-mass spectrometry in combination with single-ion monitoring, during proembryonal and embryonal development. In both cultures the highest cytokinin levels were correlated with logarithmic growth (embryonal: isopentenyladenosine, 4 ng g-1 fresh weight [FW]; isopentenyladenine, 1.4 ng g-1 FW; zeatin, 3.6 ng g-1 FW; proembryonal: isopentenyladenosine, 58.3 ng g-1 FW; isopentenyladenine, 7.9 ng g-1 FW; zeatin 11.1 ng g-1 FW). The proembryonic culture medium but not the embryonic culture medium contained isopentenyladenosine up to 28 pg ml-1 during logarithmic growth. No correlation between different embryonic stages and the endogenous cytokinin level was obvious.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00982919

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Synthese von 6-Fluorbenz[a]anthracen-Derivaten (1976)

Girke, Wolfgang ; Bergmann, Ernst D.

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1038-1045

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ISSN: 0009-2940

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Synthesis of 6-Fluorobenz[a]anthracene Derivatives6-Fluoro-(12 and 6-Fluoro-12-methylbenz[a]anthracene(11) are prepared in several steps starting with 2-bromo-3-fluoronaphthalene (1). 6-Fluorobenz[a]anthracen-127H)-one (8) predominantly occurs in the enol form 9. Efforts to synthesize 6-fluoro-7,12-dimethylbenz[a]anthracene (10) are described.

Notes: Ausgehend von 2-Brom-3-fluornapthalin (1) werden über mehrere Stufen 6-Fluor-(12) und 6-Fluor-12-methylbenz[a]anthracen (11) dargestellt. 6-Fluorbenz[a]anthracen-12(7 H)-on (8) liegt vorwiegend in der Enolform 9 vor. Syntheseversuche für 6-Fluor-7,12-dimethylbenz[a]anthracen (10) werden beschrieben.