Hiroshi Tatematsu

Dictyoprolene and neodictyoprolene, two new odoriferous compounds from the brown alga Dictyopteris prolifera: structures and synthesis

Abstract Two new odoriferous compounds, dictyoprolene 1 and neodictyoprolene 2 have been isolated from the brown alga Dictyopteris prolifera and their structures determined by chemical and spectral means. Synthesis of optically active 1 and racemic 2 has been made. Dictyoprolene 1 and neodictyoprolene 2 have been shown to be the acetates of the 1-undecen-3-ols, the postulated biosynthetic precursors of various C11 hydrocarbons and the related compounds obtained from brown algae, Dictyopteris, Ectocarpus, and Cutleria.

Real-time observation of cardiac movement and structures in congenital and acquired heart diseases employing high-speed ultrasonocardiotomography

Echocardiography has proved useful for cardiac diagnosis during the past several years; however, the conventional one-dimensional ultrasound pulse echo method cannot easily visualize the anatomical relationships of the various cardiac structures. To overcome the limitation, the authors attempted a real-time observation of cardiac structures and introduced high-speed ultrasonocardiotomography with a Sonolayergraph Model SSL-51H (Toshiba) having a logarithmic amplifier. Thirty sector images are produced per second by a mechanically operated, single flat or 75 mm. focus transducer measuring 10 mm. in diameter. The angle of a sector image composed of about 120 scanning lines is arbitrarily changeable from null to 65 degrees. The fast succession of images produced enables clear observation of the movement of cardiac structures in real time. Study of 230 patients by means of the proposed system suggests that it is advantageous as a quick method to provide two-dimensional echocardiograms for cardiac diagnosis and assessment, especially in noninvasive diagnosis.

Isolation and structure of dictyoprolene, a possible precursor of various undecanes in brown algae from Dictyopteris prolifera

The isolation and structure elucidation (including the absolute stereochemistry) of (+)-dictyoprolene (1) a constituent of Dictyopteris prolifera, together with the synthesis of (1) in optically active form indicate that (1) is the acetate of one of three undec-1-en-3-ols postulated to be key biosynthetic intermediates leading to various novel C11 hydrocarbons in Dictyopteris.