ZfN: Search Results

1	Author	Snezhana Bakalova, Ivanka Kavrakova	Requires cookie*
	Title	Electronic Spectra and Photochemical Properties of Acetyldihydroquinolinones
	Abstract	The absorption and luminescence properties o f 6-acetyl-2,3-dihydro-4(lH)-quinolinone are described and compared to those of the parent 2,3-dihydro-4(lH)-quinolinone. The character of the electronic transitions is determined by PPP quantum chemical calculations. An N-acyl migration leading to the form ation of 6-acetyl-2,3-dihydro-4(lH)-quinolinone takes place upon UV irradiation or heating with polyphosphoric acid o f 1-acetyl-2,3-dihydro-4(lH)-quinolinone. A radical mechanism of the photochemical rearrangem ent is proposed.
	Reference	Z. Naturforsch. 47b, 1775—1778 (1992); received April 4 1992
	Published	1992
	Keywords	D ihydroquinolinone, Fluorescence, Rearrangement, Photochemical Properties
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-1775.pdf
	Identifier	ZNB-1992-47b-1775
	Volume	47

2	Author	Michael Bender, Ulrich Heber, K. Arl-, Josef Dietz	Requires cookie*
	Title	Saline Growth Conditions Favour Supercooling and Increase the Freezing Tolerance of Leaves of Barley and Wheat
	Abstract	When young plants o f barley and wheat grown in hydroponic culture were subjected to salt stress, their freezing tolerance increased with increasing severity o f salt stress. Detached leaves from salt-stressed plants also exhibited an increased ability to supercool. A voidance o f ice for mation permitted leaf survival at subzero temperatures which were no longer tolerated when ice nucleation resulted in extracellular freezing. The increased freezing tolerance under salt stress is attributed to osm otic adjustment o f the plants. Increased cellular solute concentra tions decrease the extent o f cellular dehydration at freezing temperatures, thereby decreasing mechanical and chemical stresses on biomembranes during freezing and thawing.
	Reference	Z. Naturforsch. 47c, 695—7 (1992); received M ay 14/July 9 1992
	Published	1992
	Keywords	Barley, Chlorophyll a, Fluorescence, Freezing Tolerance (Leaves), Salt Stress, Supercooling
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	TEI-XML for	default:Reihe_C/47/ZNC-1992-47c-0695.pdf
	Identifier	ZNC-1992-47c-0695
	Volume	47