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Biol Bull 77: 285-296. (October 1939)
© 1939 Marine Biological Laboratory
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FURTHER EXPERIMENTS ON THE DECOMPOSITION AND REGENERATION OF NITROGENOUS ORGANIC MATTER IN SEA WATER

THEODOR VON BRAND 1, NORRIS W. RAKESTRAW 1, and CHARLES E. RENN 1

1 From the Woods Hole Oceanographic Institution, Woods Hole, Mass.

1. Several consecutive cycles of decomposition and regeneration were carried out in the same water.

2. It is confirmed that in the first cycle the main stages of decomposition are: dead body—ammonia—nitrite—nitrate. In the second cycle there is evidence of intermediate soluble substances between dead body and ammonia.

3. Under anaerobic conditions the initial states of decomposition take place more slowly than under aerobic conditions, and no nitrite or nitrate is developed.

4. Regeneration of nitrogen into phytoplankton protoplasm is possible not only in the nitrate stage but also in the ammonia stage and before the nitrate has reached its maximum.

5. The quantitative nitrogen balance was better than that reported in previous experiments, and possible reasons for the discrepancies still present are discussed.






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