[Spectral analysis of nucleotide sequences]

The data of Fourier-analysis of nucleotide sequences are discussed. The existence of reflexes corresponding to regular position of nucleotides (mainly T and G) with 3-base period is the most striking feature of both phage and viral nucleic acid sequences spectra. The amplitude and phase of the similar reflexes in the dinucleotide spectra obtained by digital computing of Fourier-transform, give specific information on amino acid composition, codon bias, amino acid relations. The width of frequency band characterizes a tendency to nucleotide clustering or to separate existence. The blurring of reflexes shows the disturbance of far order in the regular nucleotide "lattice". The two-dimensional spectral analysis supports the existence of far correlation in nucleotide positions.