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1986 (1)
1980 (1)
1978 (1)
1Author    W. Grundier, F. KeilmannRequires cookie*
 Title    Nonthermal Effects of Millimeter Microwaves on Yeast Growth  
 Abstract    Weak microwave irradiation of aqueous yeast cultures was found to affect their growth rate in a frequency-selective manner. Depending on frequency (near 42 GHz), both increases and de­ creases of the growth rate were observed. The resonance bandwidths are of the order of 0.01 GHz. Simple thermal effects can be excluded. These findings support theoretical predictions of coherent molecular oscillations activating metabolic processes. 
  Reference    Z. Naturforsch. 33c, 15 (1978); received September 5/October 10 1977 
  Published    1978 
  Keywords    Cell Biology, Cell Growth, Microwave Interaction, Resonance, Coherence 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0015.pdf 
 Identifier    ZNC-1978-33c-0015 
 Volume    33 
2Author    Regina Teschner, Stefan Postius, M. Onika Löffler, Friedhelm SchneiderRequires cookie*
 Title    Cell Proliferation and Metabolism of Ehrlich Ascites Tumor Cells Grown in Chemically Defined Albumin Medium for Several Passages  
 Abstract    Cell proliferation, cell cycle distribution, viability, uptake o f ar-aminoisobutytic acid, cyclo leucine and 2-deoxyglucose as well as DNA, RNA and protein synthesis of Ehrlich ascites tumor cells grown in suspension culture over three passages in serum free nutrient medium supplemented with 1 -2 % bovine serum albumin (Cohn fraction V, Serva) were measured and compared to cells grown in medium supplemented with 15% horse serum. At the end of the fourth passage in vitro, that is the third passage in serum free albumin medium, the growth o f the cells is reduced to about 1 0 % of the controls, accumulation of the cells in G 2 is delayed and the number o f dead cells rises to 30%. The transport rates o f a-aminoisobutyric acid and o f 2-deoxyglucose slowly decrease while the up­ take of cycloleucine shows a more complex behaviour in albumin medium. Incorporation o f thy­ midine and leucine into the cells corresponds to the growth rate, while the incorporation o f uridi­ ne in normal as well as in albumin medium exhibits different pattern. The present experiments demonstrate, that it may be possible to preserve this cells in a fairly "physiological" state during two passages in albumin medium. 
  Reference    Z. Naturforsch. 35c, 117 (1980); received October 29 1979 
  Published    1980 
  Keywords    Albumin Medium, Cell Growth, Ehrlich Ascites Tumor Cells, Metabolism 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0117.pdf 
 Identifier    ZNC-1980-35c-0117 
 Volume    35 
3Author    Hiroshi AshiharaRequires cookie*
 Title    Changes in Fructose-2,6-bisphosphate Level during the Growth of Suspension Cultured Cells of Catharanthus roseus  
  Reference    Z. Naturforsch. 41c, 529 (1986); received February 17 1986 
  Published    1986 
  Keywords    Catharanthus roseus (Vinca rosea), Fructose-2, 6-bisphosphate, M etabolic R egulation, Plant Cell Culture, Cell Growth 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0529.pdf 
 Identifier    ZNC-1986-41c-0529 
 Volume    41