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Spectra of human skin and tableted preparations of amino acids in 0,05 1,2 THz range are obtained by terahertz spectroscopy method with time resolution. Comparison of the amino acids spectral lines is made for their identification in the skin. It is shown that the following amino acids are the most clearly visible in the skin spectrum: tryptophan, cysteine, alanine, glycine, phenylalanine and histidine. Terahertz spectral lines of the mentioned amino acids are associated with molecules oscillating modes, caused by chemical reactions, hydration processes and molecules conformal changes in the human skin. Determination of amino acids spectral lines and other specific molecules, involved in the metabolic processes of the skin, is necessary for the development of terahertz diagnostic tool with maximum sensitivity and selectivity.

Our research was devoted to the impact of broadband pulsed THz radiation in the frequency range of 0.05 to 2 THz on the neurite growth in the sensory ganglia of 10-12-day chicken embryos. Dependence of changes in functional responses of cells on the average output power has been found.

Spectrum research of degraded DNA of herring in the range 0.1-1 THz was done. DNA native absorption lines were obtained. Lines, responsible for interaction with water and conformational changes, were identified.

In order to ensure safety in the use of terahertz radiation for medical problems, impact assessment of broadband terahertz radiation in the frequency range of 0.05-1.7 THz was made to investigate functional activity of tumor cells in vitro. According to the results of flow cytometry we can speculate that pulsed terahertz radiation with a power density of up to near 10mW/cm² and duration of 1 minute does not change functional activity of tumor cells. [ABSTRACT FROM AUTHOR]

According to the literary data, terahertz radiation has some effects on different blood cells. Our study focuses on the determining the level of some cell surface antigens of lymphocytes when exposed to broadband terahertz range of 0.05-1.70 THz. These data indicate that terahertz radiation with power density of 9.55, 0.63 and 0.03 mW/cm² for 1 minute does not alter the functional activity of lymphocytes. [ABSTRACT FROM AUTHOR]