Go toArchive
Browse byFacets
Bookbag ( 0 )
'Fluorescence' in keywords Facet   Publication Year 1992  [X]
Results  2 Items
Sorted by   
Publication Year
1992[X]
1Author    Snezhana Bakalova, Ivanka KavrakovaRequires 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 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1775.pdf 
 Identifier    ZNB-1992-47b-1775 
 Volume    47 
2Author    Michael Bender, Ulrich Heber, K. Arl-, Josef DietzRequires 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 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0695.pdf 
 Identifier    ZNC-1992-47c-0695 
 Volume    47