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Crystalline 1: 1‐complexes of enniatins with potassium salts are described. Complex formation constants of different antibiotics with sodium and potassium are given.

1:1‐Complexes between nonactin and monactin, and sodium, potassium, and ammonium thiocyanate are described.

The phototropic properties of the glasses must be modified for this purpose [521. A phototropic glass for use in holography [29*51,521 must have a high resolution. All phototropic glasses are better in this respect than the best photographic layer, which is tied t o the photographic grain. A high writing rate (at least 106 bits/s) is required, and the hologram must exhibit good stability over long periods [291; this requirement is linked with the regeneration time and the activation energy for regenera-tion1261. Extinction must also be possible; lasers operating in the near IR region or heat may be used for this purposec361.Baldwin 1531 has published information on the determination of the storage capacity of phototropic glasses for holography.The use of a conducting film for accelerated regeneration, which is essential for holographic applications, has been described by Justice and LeiboldI361. The specimens are coated on both sides with a transparent, electrically conducting film of stannic oxide. The applied voltage was 120 V, and the power was approximately 48 W. Specimens [52] G. Gliemeroth, Umschau in Wissenschaft und Technik 7, 210 (1970). [53] W. J. Baldwin, Appl. Optics 6, 1428 (1967).with a half life of 500 s were completely regenerated in less than 10 s on application of the electric field.The use of phototropic glasses in micrography has been described by DeKing 1541. Other applications are instrument panels that are controlled by computers and which write the data in the phototropic glass with UV beams 1221. Automobile windshields, window glass, etc. have been considered as a potential application of phototropic glass. Numerous advances have recently been made in the development of ion-selective (glass, solid, liquid) membrane electrode systems, The theoretical principles and practical re-quirements of such ccsensors" are outlined in this article, and an attempt is made to review their possible applications.