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THz spectra for some amino acids, peptide and protein have been measured by use of commercial and optically compensated FTS spectrometers. A lot of sharp spectral lines have been observed below 7 THz and attributed, tentatively and in general, to hydrogen bonds and weak intermolecular interactions for the amino-acids and simple peptides, but the detailed explanation is still lack and leaving a big room for further investigation.

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A non-thermal influence of millimeter wave radiation (swept in frequency from 64.1 GHz to 69.1 GHz, sweep­time 6 s, and with stabilized frequencies of 67.200 ± 0.001 GHz and 68.200 ± 0.001 GHz, power density S≦ 6 mW/cm2) on the puffing of giant chromosomes of the midge Acricotopus lucidus (Diptera, Chironomidae) was found. The effect is manifested as a reduction in size of a specific puff that expresses genes for a secretory protein. The non-thermal nature of the effect was proved by experiments in which the sham-exposed sample was warmed up by 2.5 °C which is more than the eight-fold microwave induced temperature increase of ≦0.3°C. Concerning the very low photon energy of mm-waves compared to the thermal energy kT, it seems likely that the coherence of the radiation is essential for the observed effect.

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