scholarly journals Modeling the Influence of Temperature, Light Intensity and Oxygen Concentration on Microalgal Growth Rate

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 496
Author(s):  
Ignacio López Muñoz ◽  
Olivier Bernard
Keyword(s):  
Oxidative Stress ◽  
Growth Rate ◽  
Oxygen Concentration ◽  
Chlorella Vulgaris ◽  
Dunaliella Salina ◽  
Isochrysis Galbana ◽  
Average Error ◽  
Strong Impact ◽  
Optimization Strategy ◽  
Effect Of Light

Dissolved oxygen plays a key role in microalgal growth at high density. This effect was so far rarely quantified. Here we propose a new model to represent the combined effect of light, oxygen concentration and temperature (LOT-model) on microalgae growth. The LOT-model introduces oxygen concentration in order to represent the oxidative stress affecting the cultures, adding a toxicity term in the expression of the net growth rate. The model was validated with experimental data for several species such as Chlorella minutissima, Chlorella vulgaris, Dunaliella salina, Isochrysis galbana. It successfully predicted experimental records with an average error lower than 5.5%. The model was also validated using dynamical data where oxygen concentration varies. It highlights a strong impact of oxygen concentration on productivity, depending on temperature. The model quantifies the sensitivity to oxidative stress of different species and shows, for example, that Dunaliella salina is much less affected than Chlorella vulgaris by oxidative stress. The modeling approach can support an optimization strategy to improve productivity, especially for managing high oxygen levels.

scholarly journals Effect of Light Intensity and Quality on Growth Rate and Composition of Chlorella vulgaris

Plants ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 31 ◽  
Author(s):  
Maria N. Metsoviti ◽  
George Papapolymerou ◽  
Ioannis T. Karapanagiotidis ◽  
Nikolaos Katsoulas
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Lipid Content ◽  
Growth Rates ◽  
Solar Irradiance ◽  
White Led ◽  
Microalgal Biomass ◽  
Nm Range ◽  
Effect Of Light

In this research, the effect of solar irradiance on Chlorella vulgaris cultivated in open bioreactors under greenhouse conditions was investigated, as well as of ratio of light intensity in the 420–520 nm range to light in the 580–680 nm range (I420–520/I580–680) and of artificial irradiation provided by red and white LED lamps in a closed flat plate laboratory bioreactor on the growth rate and composition. The increase in solar irradiance led to faster growth rates (μexp) of C. vulgaris under both environmental conditions studied in the greenhouse (in June up to 0.33 d−1 and in September up to 0.29 d−1) and higher lipid content in microalgal biomass (in June up to 25.6% and in September up to 24.7%). In the experiments conducted in the closed bioreactor, as the ratio I420–520/I580–680 increased, the specific growth rate and the biomass, protein and lipid productivities increased as well. Additionally, the increase in light intensity with red and white LED lamps resulted in faster growth rates (the μexp increased up to 0.36 d−1) and higher lipid content (up to 22.2%), while the protein, fiber, ash and moisture content remained relatively constant. Overall, the trend in biomass, lipid, and protein productivities as a function of light intensity was similar in the two systems (greenhouse and bioreactor).

scholarly journals Influence of Carbohydrate Additives on the Growth Rate of Microalgae Biomass with an Increased Carbohydrate Content

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 381
Author(s):  
Anna Andreeva ◽  
Ekaterina Budenkova ◽  
Olga Babich ◽  
Stanislav Sukhikh ◽  
Vyacheslav Dolganyuk ◽  
...  
Keyword(s):  
Growth Rate ◽  
Chlorella Vulgaris ◽  
Nutrient Medium ◽  
Dunaliella Salina ◽  
Arthrospira Platensis ◽  
Carbohydrate Content ◽  
Biofuel Production ◽  
Total Carbohydrate ◽  
Microalgae Biomass ◽  
Total Carbohydrates

Our study focused on investigating the possibilities of controlling the accumulation of carbohydrates in certain microalgae species (Arthrospira platensis Gomont, Chlorella vulgaris Beijer, and Dunaliella salina Teod) to determine their potential in biofuel production (biohydrogen). It was found that after the introduction of carbohydrates (0.05 g⋅L−1) into the nutrient medium, the growth rate of the microalgae biomass increased, and the accumulation of carbohydrates reached 41.1%, 47.9%, and 31.7% for Arthrospira platensis, Chlorella vulgaris, and Dunaliella salina, respectively. Chlorella vulgaris had the highest total carbohydrate content (a mixture of glucose, fructose, sucrose, and maltose, 16.97%) among the studied microalgae, while for Arthrospira platensis and Dunaliella salina, the accumulation of total carbohydrates was 9.59% and 8.68%, respectively. Thus, the introduction of carbohydrates into the nutrient medium can stimulate their accumulation in the microalgae biomass, an application of biofuel production (biohydrogen).

Effect of growth rate on the eicosapentaenoic acid and docosahexaenoic acid content of Isochrysis galbana in chemostat culture

1994 ◽  
Vol 41 (1) ◽  
pp. 23-27 ◽  
Author(s):  
E. Molina Grima ◽  
J. A. S�nchez P�rez ◽  
F. Garc�a Camacho ◽  
J. M. Fern�ndez Sevilla ◽  
F. G. Aci�n Fern�ndez
Keyword(s):  
Growth Rate ◽  
Docosahexaenoic Acid ◽  
Eicosapentaenoic Acid ◽  
Acid Content ◽  
Chemostat Culture ◽  
Isochrysis Galbana

Chlorella vulgaris ameliorates testicular toxicity induced by deltamethrin in male rats via modulating oxidative stress

Andrologia ◽  
2018 ◽  
Vol 51 (3) ◽  
pp. e13214 ◽  
Author(s):  
Eman Osama ◽  
Azza A. A. Galal ◽  
Hany Abdalla ◽  
Sawsan M. A. El-Sheikh
Keyword(s):  
Oxidative Stress ◽  
Chlorella Vulgaris ◽  
Male Rats ◽  
Testicular Toxicity
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