Abstract
The uptake of ammonia and nitrate by particulate matter during photosynthesis in large light and dark bottles was followed by colorimetric and mass spectrometric methods. Ammonia uptake as determined by the 15N isotope was always higher than the parallel estimate from colorimetric analysis. The uptake (or release) of ammonia in the dark was inversely related to the protein content of the corresponding sample of particulate matter. Utilization of nitrate in light was inversely proportional to the concentration of ammonia available. The particulate organic matter contained 50.5% protein in light bottles but 61.7% protein in dark ones. The mean ratio of oxygen changes, as calculated from changes in protein, carbohydrate, and lipid to those found experimentally, was 1.03 in light bottles (indicating good agreement) and −0.34 in dark ones. This is interpreted as evidence for some particle formation in the dark that is probably not microbial.
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