1. Substrate gradients in bioreactors: origin and consequences

   • G. Larsson
   • M. Törnkvist
   • S. -O. Enfors

   Originals Pages: 281 - 289

2. Continuous production of L-tert-leucine in series of two enzyme membrane reactors

   • U. Kragl
   • D. Vasic-Racki
   • C. Wandrey

   Originals Pages: 291 - 297

3. Modeling and control of batch fermentation processes under conditions of uncertainty

   • O. Georgieva
   • T. Patarinska

   Originals Pages: 299 - 306

4. Influence of nutrients on cell growth and xanthan production by Xanthomonas campestris

   • H. Umashankar
   • G. Annadurai
   • M. R. V. Krishnan

   Originals Pages: 307 - 309

5. Gas holdup and liquid velocity in airlift bioreactors containing viscous newtonian liquids

   • J. Rajarajan
   • D. Pollard
   • P. Ayazi Shamlou

   Originals Pages: 311 - 315

6. Effect of mode of operation of bioreactors on the biosynthesis of penicillin amidase in Escherichia coli

   • K. Jagannadha Rao
   • T. Panda

   Originals Pages: 317 - 321

7. Optimal control of batch processes involving simultaneous enzymatic and microbial reactions

   • J. A. Asenjo
   • W -H. Sun
   • J. L. Spencer

   Originals Pages: 323 - 329