SUMMARY: The two chrysomonads, and a sp., contained chlorophylls and , carotene and fucoxanthin, and a number of minor xanthophylls. was rich in chlorophyll and had a chlorophyll ratio of 1.5:1.0; in Hymenomonas the ratio was 5:1. Incubation of broken-cell preparations at high light intensities resulted in the decomposition of chlorophyll , whereas chlorophyll was stable under these conditions. This photochemical bleaching of chlorophyll shifted the spectrum from 678 to 674 mμ with a difference spectrum showing a maximum at 680 mμ. Maximum photosynthetic rates of 150-200 μmoles CO/mg. chlorophyll +/hr were reached in 10-day cultures. Maximum populations of 10 organisms/ml. for Hymenomonas and 10 for were reached in about 14 days. Hymenomonas grew best at light intensities of 800 ft.c. or higher, whereas growth of was independent of light intensity above 60 ft.c. Maximum photosynthetic rates were obtained at a light intensity of 3500 ft.c.


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