In this review work [1], characteristics of electrically-conducting media are reviewed from the macroscopic viewpoint based on the mean-field magnetohydrodynamics. The themes covered in this review range from the generation mechanism of stellar magnetic fields (dynamo) to transport properties in fusion, The primary concern here is to see the characteristics common to these apparently different phenomena, within the framework of the mean-field theory. Owing to the intrinsic limitation of the

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... oach, the present discussions are limited more or less to specific aspects of phenomena. They are supplemented with the reference to theoretical, numerical, and observational approaches intrinsic to each theme. In the description of dynamo phenomena, an emphasis is put on the cross-helicity dynamo. The electromotive force is expressed as E T " (u' xB') ~a B -j3j + ym (' dcnotes the turbulent part and the over-bar denotes the mean field.) The coefficient y represents the cross helicity dynamo. Features common to the stellar magnetic-field generation and the rotational-motion drive in toroidal plasmas are illustrated on this basis. This review covers the following issues: