Some physical and chemical characteristics of algae growth in mass culture

Ketchum, Bostwick H.; Redfield, Alfred C.

doi:10.1002/jcp.1030330303

Cited by 108 publications

(44 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…• From the data of Richman (1958) and Ketchum and Redfield (1949) the average caloric value of 7 cultures of chlorophyceae, representing 6 species from 4 genera including Chlamydomonas, was 5,230 calories per gram of dry weight, with the range from 5,158 cal/g to 5,507 cal/g, Ketchum and Redfield found the average dry weight per unit volume of -4 3 algal cells in their 6 cultures to be 2,305 x 10 g/mm . I foimd the average red cell diameter in sample 1 to be 16,4 |j," so, treating it as a sphere, the average red cell volume is 2,32 x 10"^ mm , The average red cell dimensions in sample 17 were 14,6 |j, long by 10,7 |j, wide, so, treating these as ellipsoids of revolution, the average volume of an ovoid red -7 3 cell is 8,74 x 10 mm , The average measurements of the clear and green elongate cells (mostly Scotiella nivalis) from several samples were 18,36 |ji long by 9,26 |j, wide, so, treating these cells as ellipsoids of -7 3 revolution, the average cell volume was 8,3 x 10 mm .…”

Section: Algaementioning

confidence: 97%

ECOLOGICAL INVESTIGATIONS OF ICE WORMS ON CASEMENT GLACIER, SOUTHEASTERN ALASKA. Institute of Polar Studies Report No. 39.

Goodman¹

1971

View full text Add to dashboard Cite

Section: Algaementioning

confidence: 97%

ECOLOGICAL INVESTIGATIONS OF ICE WORMS ON CASEMENT GLACIER, SOUTHEASTERN ALASKA. Institute of Polar Studies Report No. 39.

Goodman¹

1971

View full text Add to dashboard Cite

“…This capacity of accumulation, especially for lipids, has stimulated research 362 aiming at the production of lipid biofuel (Chisti, 2007). The nitrogen deficiency is a well 363 known condition to stimulate this accumulation (Ketchum and Redfield, 1949 (Table 4), but also to a reduction in the growth rate. From equation (2) and (4), it is possible 370 to calculate the effect of nitrogen limitation on the cell stoichiometry, and thus on the 371 theoretical methane potential and the theoretical ammonia release (Table 2).…”

Section: Biogas Quality 238mentioning

confidence: 99%

Anaerobic digestion of microalgae as a necessary step to make microalgal biodiesel sustainable

Sialve¹,

Bernet²,

Bernard³

2009

Biotechnology Advances

1,004

543

View full text Add to dashboard Cite

“…Even before the war the relationship between nitrogen nutrition and lipid content of algae was already recognized (89). After the war the study of microalgae lipids was pursued by groups in Germany (90), England (91), and, the U.S. (92).…”

Section: Introductionmentioning

confidence: 99%

Effects of Fluctuating Environments on the Selection of High Yielding Microalgae

Benemann¹,

Tillett²

1987

View full text Add to dashboard Cite

Microalgae have the potential of producing biomass with a high content of lipids at high productivities using seawater or saline ground water resources. Microalgal lipids are similar to vegetable oils and suitable for processing to liquid fuels. Engineering Icost analysis studies have concluded that, at a favorable site, microalgae cultivation for fuel production could be economically viable. The major uncertainties involve the microalgae themselves: biomass and lipid productivity and culture stability.The mass culture of microalgae for low cost lipids production requires a detailed understanding of both the physiology of lipid biosynthesis by the selected algal strains and of the factors making these strains competitive in outdoor ponds. Mass culture systems will, because of climatic variability, the day-night cycle, and inherent design factors, exhibit fluctuations in key parameters affecting algal growth, productivity and competitiveness: temperature, pH, po?, pC02' light, and nutrient availability. This project has for ~ts overall objective to quantitate the effects of such fluctuations on culture productivity and species competitiveness. A second objective has been the development of basic information on algal physiology as it relates to lipid productivity.Species competition experiments with several strains of algae isolated by the SERI/DOE Aquatic Species Program, some of which were previously used in outdoor mass cultures, were carried out. In these experiments certain parameters proved to be more important then others in determining species succession: fluctuating p02 was more important than fluctuating temperature, which was more important than fluctuating pH. These results must be extended to other species and conditions to determine how far these findings can be generalized. Future work will concentrate on comparing unialgal to mixed culture experiments and on elucidating the specific environmental factors that impact on species productivity and competitiveness.To help guide this work, a computer model was developed capable of predicting the amplitude and frequency of the environmental parameters (p02' pH, PC02, temperature, and light intensity) over the diurnal cycle throughout the year at any location for which climatic data is available. This model must still be validated with data collected from operating ponds.Using one algal strain, "Nanno Q" (Nannochloropsis sp.), as a test organism we also have investigated strategies for maximizing lipid productivity. Our data suggest a two stage process: the first stage is operated at the highest density permitting maximal productivity and the second stage at a higher light input (lower standing biomass or cell density) and under conditions of nitrogen starvation. Such a two stage system is more productive than a continuous nitrogen limited culture process. Future work in this area should utilize algal strains that have previously been selected for their competitiveness under outdoor conditions.

show abstract

Some physical and chemical characteristics of algae growth in mass culture

Cited by 108 publications

References 8 publications

ECOLOGICAL INVESTIGATIONS OF ICE WORMS ON CASEMENT GLACIER, SOUTHEASTERN ALASKA. Institute of Polar Studies Report No. 39.

ECOLOGICAL INVESTIGATIONS OF ICE WORMS ON CASEMENT GLACIER, SOUTHEASTERN ALASKA. Institute of Polar Studies Report No. 39.

Anaerobic digestion of microalgae as a necessary step to make microalgal biodiesel sustainable

Effects of Fluctuating Environments on the Selection of High Yielding Microalgae

Contact Info

Product

Resources

About