ZfN: Search Results

1	Author	Klaus-Dieter Spindler, M. Argarethe Spindler-Barth, Andreas Turberg, G. Ünter, Adam	Requires cookie*
	Title	Action of Brassinosteroids on the Epithelial Cell Line from Chironomus tentans
	Abstract	The two brassinosteroids, 22S',23S'-homobrassinolide and 22S',23S'-homocastasterone are weak com petitors o f the binding o f [3H]ponasterone A to the intracellular ecdysteroid receptor from the epithelial cell line from Chironom us tentans. The relative affinities to the ecdysteroid receptor are 0.001 for both brassinosteroids as compared to 20-OH-ecdysone and 0.1 in com parison to ecdysone. Both substances exert m orphological effects similar to those observed with 20-OH-ecdysone. Like m oulting horm ones both brassinosteroids inhibit chitin synthesis. However, these effects were observed only at rather high concentrations (10-5 to 10"4 m) which were cytotoxic for 22 5,23 S'-homobrassinolide.
	Reference	Z. Naturforsch. 47c, 280—2 (1992); received October 1/D ecem ber 3 1991
	Published	1992
	Keywords	Ecdysteroid Receptor, Acetylcholinesterase, Chitin Synthesis, Brassinosteroids
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	TEI-XML for	default:Reihe_C/47/ZNC-1992-47c-0280.pdf
	Identifier	ZNC-1992-47c-0280
	Volume	47

2	Author	Jürgen Schmidt, Frank Böhme, G. Ünter, Adam	Requires cookie*
	Title	24-Epibrassinolide from Gypsophila perfoliata
	Abstract	The scarce 24-epibrassinolide could be identified from seeds of G ypsophila perfoliata L. by GC/MS as the only brassinosteroid present. Furtherm ore, the A7-phyto-sterols ergost-7-en-3ß-ol, spinasterol and 22-dihydro-spinasterol were found as main sterols in the same plant material.
	Reference	Z. Naturforsch. 51c, 897—899 (1996); received July 9/
	Published	1996
	Keywords	Gypsophila perfoliata L, Caryophyllaceae, Seeds, Brassinosteroids, 24-Epibrassinolide
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	TEI-XML for	default:Reihe_C/51/ZNC-1996-51c-0897_n.pdf
	Identifier	ZNC-1996-51c-0897_n
	Volume	51

3	Author	Jürgen Schmidt3, Klaus Richter6, Brunhilde Voigt3, Günter Adam3	Requires cookie*
	Title	Metabolic Transformation of the Brassinosteroid 24-£/?i-castasterone by the Cockroach Periplaneta americana
	Abstract	A fter feeding of 24-ep/-castasterone to the cockroach Periplaneta americana an organ-specific epimerization of the brassinosteroid to 2,24-d/ep/-castasterone could be detected in fem ale insects. The m etabolite being observed only in the ovaries and not in the testes of the insect was identified by GC/M S in comparison with a synthesized authentic sample. Con trary, 24-ep/-brassinolide is not m etabolized in the sexual organs of Periplaneta americana. This is the first evidence of a m etabolic transformation of a brassinosteroid in insects.
	Reference	Z. Naturforsch. 55c, 233 (2000); received November 2/November 29 1999
	Published	2000
	Keywords	Periplaneta americana, Brassinosteroids, M etabolic Transformation
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	TEI-XML for	default:Reihe_C/55/ZNC-2000-55c-0233.pdf
	Identifier	ZNC-2000-55c-0233
	Volume	55