The isoflavone constituents in soybean seeds were investigated, and 9 kinds of isoflavone glycosides were isolated from the hypocotyls of soybean seeds. Three kinds were proved to be malonylated soybean isoflavones named 6"-0-malonyldaidzin, 6"-O-malonylglycitin and 6"-0-malonylgenistin by UV, MS, IR and NMR.The malonylated isoflavone glycosides as major isoflavone constituents in soybean seed were thermally unstable, and were converted into their corresponding isoflavone glycosides. All of the isoflavone components produced intensely undesirable taste effects such as bitter, astringent and dry mouth feeling. Soybeans are known to contain the five isoflavone glycosides, genistin,^daidzin,1} glycitein 7-O-jS-D-glucoside (glycitin),2) 6"-O-acetylgenistin3) and 6"-(9-acetyldaidzin,4) and

A general method to deal with the ͑relativistic͒ force-free electromagnetic field is developed. We formulate the theory without assuming symmetry of the electromagnetic field configuration. Thus we can apply it to any object where the force-free approximation is justified, e.g., the pulsar magnetosphere, the black-hole magnetosphere, and the magnetosphere around the accretion disk. We describe the force-free electromagnetic field by a classical field theory. The basic variables are the Euler potentials extended to the relativistic degenerate electromagnetic field. The basic equation is given by a two-component nonlinear equation for two Euler potentials. The theory has a close connection with geometry. It is based on the concept of the flux surface. The flux surface is a geometric entity corresponding to the world sheet of the magnetic field line. We give both the covariant and the 3ϩ1 expression of the basic equation. By the latter form, the causal development of the force-free electromagnetic field is discussed. It is shown that the theory describes the causal development of the force-free electromagnetic field self-consistently as far as F•FϾ0. The basic equation contains arbitrariness. It does not determine the solution uniquely. Although this arbitrariness originates from the gauge freedom of the electromagnetic field, it differs from the arbitrariness in the ordinary gauge field theories. Namely, the dynamics of the Euler potentials itself does not contain arbitrariness. It appears from nonuniqueness in correspondence between the Euler potentials and the electromagnetic field. Further, we discuss the breakdown of the force-free approximation. ͓S1063-651X͑97͒03008-0͔PACS number͑s͒: 41.20.Ϫq, 95.30.Qd

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