Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525522
Title Conversion of light energy in algal culture
Author(s) Oorschot, J.L.P. van
Source University. Promotor(en): E.C. Wassink. - Wageningen : Veenman - 53
Publication type Dissertation, internally prepared
Publication year 1955
Keyword(s) fotosynthese - algen - algenteelt - biobased economy - opbrengsten - photosynthesis - algae - algae culture - yields
Categories Photosynthesis
Abstract The conversion of light energy in algal culture was quantitatively studied under various growth conditions. Absorbed light energy during growth and energy fixed in organic material were estimated. The efficiency of the conversion was expressed as percentage of fixed energy (calculated from estimates of dry weight and elemental analysis of the cell. Often almost complete light absorption was achieved by high cell density or thick culture layers.

To estimate the maximum fixation of solar energy, such dense cultures were used under natural conditions. Large cultures had an efficiency of 1-5 % of the incident light energy in April-November (λ< 0,7μ) and a yield of 1-13 g per metre 2per day, and small dense cultures one of 8 % and a yield of 20 g per metre 2per day during July and August. From mathematical description of the relation between light intensity and the rate of photosynthesis, yields were calculated for dense cultures. The yields and efficiency of light energy conversion calculated in this way were confirmed in experiments under controlled conditions. The influence of temperature was studied. The source of nitrogen influenced the efficiency of the light conversion but not the chemical composition of the cell. Nitrogen deficiency decreased the efficiency and increased the relation carbohydrate/protein. High lipid contents were attained only after prolonged growth periods, and were associated with very low efficiencies.

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