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Nonthennal effects of millimeter wave (MMW) radiation upon the vibrational spectra parameters of o.-Gly, 13-Ala, DL Trp, L-Tyr, L-His aminoacids and AMP nucleotide are presented. MMW induced intensity changes up to 35% in IR absorption spectra of Trp, Tyr and AMP films were discovered. Irradiation effect was observed in a number of bands corresponding to different chemical bonds and forms of vibrations Resonance character of MMW effect was regarded as its distinctive feature. In IR reflection spectra of o.-Gly, 13-Ala, L-His single crystals the band structure changes were found together with the intensity redistribution. The MMW action had a resonance nature which appeared to be more pronounced for NH;and coo· deformational vibrations. The amplitude of changes approached 55% of initial intensity. It was shown that specimens' temperature did not vary (accurate to 0,5° C) in the process of irradiation. Heating up to 320 K resulted only in well known temperature effects upon IR bands, that differs essentially from the non-thermal MMW action observed.
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