1. Editorial

   EditorialNotes Pages: 149 - 149

2. On-line HPLC-measurement and control of substrate in a continuously operated biological tank reactor

   • J. Meschke
   • H. Bennemann
   • D. C. Hempel

   Originals Pages: 151 - 157

3. Biological conversion of rifamycin B by live Humicola sp. cells immobilized in a dual hollow fiber bioreactor

   • Y. B. Hwang
   • B. H. Chung
   • M. H. Han

   Originals Pages: 159 - 163

4. Theoretical analysis of the baker's yeast production: An experimental verification at a laboratory scale

   • A. P. J. Sweere
   • J. P. van Dalen
   • R. S. Renger

   Originals Pages: 165 - 171

5. The effect of cultivation conditions on the penicillin production using a urethane foam-supported Penicillium chrysogenum

   • T. Nagamune
   • I. Endo
   • T. Kobayashi

   Originals Pages: 173 - 176

6. Two-step fermentation of acidic grape musts: Interactions between Schizosaccharomyces pombe and Saccharomyces spp.

   • T. Satyanarayana
   • P. Strehaiano
   • G. Goma

   Originals Pages: 177 - 180

7. The effect of anti-foam agents on the ultrafiltration of a protease solution

   • J. Kloosterman IV
   • P. D. van Wassenaar
   • H. Baksteen

   Originals Pages: 181 - 185

8. Announcements

   Announcement Pages: 186 - 186

9. Product reports from Japan

   Report Pages: 187 - 188