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- Title
Over-All Light Energy Conversion Efficiency of a High-Temperature Strain of Chlorella pyrenoidosa.
- Authors
Goulueke, Clarence G.
- Abstract
1. A study was made of the effect of tempetature, detention period, length of daily illumination period and rate of light energy absorption (periodicity) on the over-all light energy conversion efficiency of continuous cultures of a light temperature strain of Chlorella pyrenoidosa isolated from an outdoor high-rate oxidation pond at Richmond, California. 2. At all temperatures, efficiency declined with increase in rate of light energy absorption, dropping, from 17 to 18% at 4 to 5 cal./l. · min., to 5 to 6% at 40 to 50 cal./l. · min. The rate of decline was most rapid between input rates of 12 to 14 cal./l. · min. and 31 to 34 cal./l · min., dropping about 0.533% for for each additional cal./l. · min. of visible light energy input. The saturation zone was apparently reached at the 44 to 50 cal./l. · min. rate. 3. Maximum differences between efficiencies at the various temperatures was greatest at the lowest light input, 4 to 5 cal./l. · min., ranging from 18% at 22°C to 16.9% at 35°C. The efficiency for 40 C at this input was 17.7%. As light intensity was increased, the difference became less, although the relative positions remained the same. In the zone of saturation, efficiencies were similar, regardless of temperature. 4. Over-all conversion efficiency declined with increase in detention period from 1 to 4 days within the range of temperatures tried, viz., 22° to 40° C. The decline was less noticeable at 40° C, and at all temperatures was most extensive when the detention period was extended from 3 to 4 days. 5. Extending the daily illumination period from 9.6 hr. (40% periodicity) to 24 hr. (100% periodicity) had little, if any, effect on the conversion efficiency of the cultures at temperatures of 30° to 40°C. At 22 C. the efficiency declined from 18.9 % at 40 % periodicity, to 15.3 % at 100 % periodicity.
- Subjects
RICHMOND (Calif.); CALIFORNIA; PHYSIOLOGICAL effects of temperature; ENERGY conversion; ABSORPTION; LIGHTING; CHLORELLA pyrenoidosa
- Publication
Physiologia Plantarum, 1962, Vol 15, Issue 1, p1
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1962.tb07981.x