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    STUDIA PHYSICA - Ediţia nr.2 din 2005  
         
  Articol:   MICROWAVE ABSORPTION IN PLASMIDIC PBR322 DNA MOLECULES.

Autori:  CRISTINA M. MUNTEAN, ANDREI IOACHIM, CĂLINA CORNEA.
 
       
         
  Rezumat:  In this work, scalar microwave measurements of insertion loss and return loss have been caried out between 7.3 12.4 GHz, at room temperature, for aqueous solutions of plasmidic pBR322 DNA and for the corresponding buffer. A low intensity microwave driving field was considered. Samples were placed in a particular configuration of weak electric field. The relative electric field attenuation constants and the percentage of the microwave power attributed to 4362 bp circular DNA-hydration layer, were calculated on the basis of insertion loss and return loss. A broadband influence of low intensity microwaves, have been found for plasmidic DNA-hydration layer systems. No sharp feature, which might prove the participation of acoustic mode excitation to DNA dynamics, at GHz frequencies has been observed. Debye type relaxation processes can explain the experimental results.  
         
     
         
         
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