1. Was the pre-biotic atmosphere of the Earth heavily reducing?

   • Michael H. Hart

   OriginalPaper Pages: 261 - 266

2. Metalloporphyrins and molecular complexes of amino acids with porphyrins in juvenile volcanic ash

   • M. P. Kolesnikov
   • I. A. Egorov

   OriginalPaper Pages: 267 - 277

3. The radioracemization of amino acids by ionizing radiation: Geochemical and cosmochemical implications

   • William A. Bonner
   • Neal E. Blair
   • Richard M. Lemmon

   OriginalPaper Pages: 279 - 290

4. Model experiments on nitrite and nitrate in simulated primeval conditions

   • A. Zohner
   • E. Broda

   OriginalPaper Pages: 291 - 298

5. Antiquity and evolutionary status of bacterial sulfate reduction: Sulfur isotope evidence

   • Manfred Schidlowski

   OriginalPaper Pages: 299 - 311

6. Archean photoautotrophy: Some alternatives and limits

   • Andrew H. Knoll

   OriginalPaper Pages: 313 - 327

7. Oxygen as a factor in eukaryote evolution: Some effects of low levels of oxygen onSaccharomyces cerevisiae

   • Linda Jahnke
   • Harold P. Klein

   OriginalPaper Pages: 329 - 334

8. Soil stabilization by a prokaryotic desert crust: Implications for Precambrian land biota

   • S. E. Campbell

   OriginalPaper Pages: 335 - 348

9. Book reviews

   • Andrew G. De Rocco
   • Clair E. Folsome
   • Lindley Darden

   BookReview Pages: 349 - 352