%0 Journal Article %T High frequency sonography of the cardiovascular system in the early development of the lower vertebrates %A Burlakov, A.B. %A Titov, S.A. %A Zykova, L.A. %K lower vertebrates, cardiovascular system, sonography, scanning acoustic microscope %J Russian Journal of Biological Physics and Chemisrty %D 2021 %N 6 %P 5 %I Federal State Educational Institution of Higher Education Sevastopol State University