| A sea urchin tissue in the form of a thick film was prepared for a photoacoustic (PA) study. A broad absorption band in the visible region (with the maximum near yellow/green color at about 570 nm) of the PA spectrum was registered. A very intense PA band arising from the π → π*, n → π* charge transfer transition was observed below 350 nm. PA spectra in the visible part of electromagnetic spectrum strongly depended on the decomposition or dehydration processes of the organic matter. The registered PA spectra were very similar to those of other living organisms, Trunculariopis Trunculus and Asterias Rubens obtained earlier. The absorption band near 570 nm was also very similar to that obtained for spermidine copper complexes which play an important role in the transfer of information to DNA. The obtained results might be interpreted as experimental evidence of a law stating that evolutionally older living creatures absorb more intensely that part of the solar radiation that is transparent in water. The human body is composed mostly of water molecules and the same part of solar radiation penetrating deep inside the body might play a crucial role in many physical and chemical processes. |
full paper (pdf, 102 Kb)