Yields, photosynthetic efficiencies, and proximate chemical composition of dense cultures of marine microalgae. A subcontract report
The yields, photosynthetic efficiencies, and proximate composition of several microalgae were compared in dense cultures grown at light intensities up to 70% sunlight. Yields ranged from 3.4 to 21.7 g dry weight/m/sup 2/ day. The highest yield was obtained with Phaeodactylum; the lowest in Botryococcus cultures. The same species had the highest and lowest efficiencies of utilization of photosynthetically active radiation. In nitrogen-sufficient cells of all but one species, most of the dry weight consisted of protein. Lipid content of all species was 20 to 29%, and carbohydrate content 11 to 23%. Lipid content increased somewhat in N-deficient Phaeodactylum and Isochrysis cells, but decreased in deficient Monallanthus cells. Because the overall dry weight yield was reduced by deficiency, lipid yields did not increase. However, since the carbohydrate content increased to about 65% in N-deficient Dunaliella and Tetraselmis cells, the carbohydrate yield increased. In Phaeodactylum the optimum light intensity was about 40% of full sunlight. Most experimets with this alga included a CUSO/sub 4/ filter to decrease infrared irradiance. When this filter was removed, the yield increased because more red light in the photosynthetically active spectral range was included. These results should prove useful to workers attempting to maximize yields and efficiencies, but additional studies are needed. 69 references, 27 figures, 18 tables.
- Research Organization:
- Scripps Institution of Oceanography, San Diego, CA (USA)
- DOE Contract Number:
- AC02-77CH00178
- OSTI ID:
- 5632620
- Report Number(s):
- SERI/STR-231-1896; ON: DE83011992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
ALGAE
CHEMICAL COMPOSITION
PRODUCTIVITY
PHOTOSYNTHESIS
EFFICIENCY
PHYTOPLANKTON
AQUACULTURE
CARBOHYDRATES
CULTURE MEDIA
EXPERIMENTAL DATA
GROWTH
LIPIDS
NUTRIENTS
OPACITY
PROTEINS
SOLAR RADIATION
AQUATIC ORGANISMS
CHEMICAL REACTIONS
DATA
INFORMATION
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYSICAL PROPERTIES
PLANKTON
PLANTS
RADIATIONS
STELLAR RADIATION
SYNTHESIS
AQUATIC SPECIES PROGRAM
BENCH-SCALE EXPERIMENTS
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