TY JOUR TI QUANTIFICATION OF CHIRALITY SPIRAL PROTEIN STRUCTURES KW proteins KW chirality KW enantiomers KW alpha-carbon KW right alpha-helix KW left polyproline helix KW vector product KW direction vector KW chirality map JO Russian Journal of Biological Physics and Chemisrty AU Lutsenko, A.O. AU Sidorova, A.E. PY 2019 IS 4 PB Federal State Educational Institution of Higher Education Sevastopol State University