1. Editorial

   EditorialNotes Pages: I - I

2. Substrate effects in tower loop reactors

   • H. Buchholz
   • R. Luttmann
   • K. Schügerl

   Biotechnology Pages: 63 - 68

3. Investigation of the structure of two-phase flows. Model media in bubble-column bioreactors

   • W. Zakrzewski
   • J. Lippert
   • K. Schügerl

   Biotechnology Pages: 69 - 75

4. Studies on the accumulation of heavy metal elements in biological systems

   • Akira Nakajima
   • Takao Horikoshi
   • Takashi Sakaguchi

   Biotechnology Pages: 76 - 83

5. Studies on the accumulation of heavy metal elements in biological systems

   • Takashi Sakaguchi
   • Akira Nakajima
   • Takao Horikoshi

   Biotechnology Pages: 84 - 89

6. Studies on the accumulation of heavy metal elements in biological systems

   • Takao Horikoshi
   • Akira Nakajima
   • Takashi Sakaguchi

   Biotechnology Pages: 90 - 96

7. Amperometric determination of viable cell numbers based on sensing microbial respiration

   • Tadashi Matsunaga
   • Isao Karube
   • Shuichi Suzuki

   Biotechnology Pages: 97 - 101

8. Microbial sensor system which usesMethylomonas sp. for the determination of methane

   • Tadashi Okada
   • Isao Karube
   • Shuichi Suzuki

   Biotechnology Pages: 102 - 106

9. Growth ofMethylomonas methanolica: Factors Influencing growth yield

   • M. H. Häggström
   • M. Dostálek

   Industrial Microbiology Pages: 107 - 112

10. Comparative study of amylolytic enzymes production byAspergillus niger in liquid and solid-state cultivation

    • Didier Alazard
    • Maurice Raimbault

    Industrial Microbiology Pages: 113 - 117

11. Anaerobic digestion: microbial and biochemical aspects of volatile acid production

    • J. L. Uribelarrea
    • A. Pareilleux

    Environmental Microbiology Pages: 118 - 122

12. In-vitro radiometry and microscopy for sensitive measurement of toxicity in activated sludge

    • Jason A. Caplan
    • Jed W. Fahey
    • Louis T. Mulligan

    Environmental Microbiology Pages: 123 - 127