1. SO₂ and NO₂ effects on microbial activity in an acid forest soil

   • I. F. Grant
   • K. Bancroft
   • M. Alexander

   OriginalPaper Pages: 85 - 89

2. Bacterial ecology of an old-growth douglas fir canopy

   • B. A. Caldwell
   • C. Hagedorn
   • W. C. Denison

   OriginalPaper Pages: 91 - 103

3. A comparison of oxygen, nitrate, and sulfate respiration in coastal marine sediments

   • Jan Sørensen
   • Bo Barker Jørgensen
   • Niels Peter Revsbech

   OriginalPaper Pages: 105 - 115

4. Occurrence ofThioploca in Lake Constance and Lower Saxony, Germany

   • S. Maier
   • W. C. Preissner

   OriginalPaper Pages: 117 - 119

5. An indirect fluorescent antibody staining technique for determining population levels ofThiobacillus ferrooxidans in acid mine drainage waters

   • James E. Gates
   • Khoi D. Pham

   OriginalPaper Pages: 121 - 127

6. Influence of cation content on adenosine triphosphate determinations in soil

   • F. Eiland
   • B. S. Nielsen

   OriginalPaper Pages: 129 - 137

7. Inhibitory effects of copper on bacteria related to the free ion concentration

   • L. P. T. M. Zevenhuizen
   • J. Dolfing
   • Ineke J. Scholten-Koerselman

   OriginalPaper Pages: 139 - 146

8. Book review

   • Joel Goldman

   BookReview Pages: 147 - 148

9. Book review

   • Gabriel Bitton

   BookReview Pages: 149 - 150

10. Announcement

    Announcement Pages: 151 - 151