Modeling of Chlorella vulgaris algae in shake flasks with respect to light intensity and light duration

2020 ◽  
Vol 92 (9) ◽  
pp. 1225-1226
Author(s):  
T. Hernández Rodríguez ◽  
S. Deppe ◽  
V. Gassenmeier ◽  
F. Kuhfuss ◽  
M. Tölle ◽  
...  
Keyword(s):  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Light Duration ◽  
Shake Flasks

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).

Increase of Copper Toxicity to Growth of Chlorella vulgaris with Increase of Light Intensity

1998 ◽  
Vol 35 (2) ◽  
pp. 193-198 ◽  
Author(s):  
F.M. Lupi ◽  
H.M.L. Fernandes ◽  
I. Sá-Correia
Keyword(s):  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Copper Toxicity

scholarly journals Optimizing Chlorella Vulgaris And Anabaena Variabilis Growth Conditions For Use As Biofuel Feedstock

2016 ◽  
Vol 42 (2) ◽  
pp. 191-200
Author(s):  
NJ Tarin ◽  
NM Ali ◽  
AS Chamon ◽  
MN Mondol ◽  
MM Rahman ◽  
...  
Keyword(s):  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Vitamin B1 ◽  
Growth Conditions ◽  
Anabaena Variabilis ◽  
Biofuel Production ◽  
Optimum Growth ◽  
Biofuel Feedstock ◽  
Isolation And Characterization ◽  
Physical And Chemical

Isolation and characterization of Chlorella vulgaris (green alga) and Anabaena variabilis (cyanobacterium) were made from natural and artificial water bodies of Dhaka University and Khulna, Bangladesh from March through December 2014 using modified Chu-10D medium to determine their potential as feedstock for biofuel production. Optimum growth measured as total chlorophyll and optical density under varying physical and chemical environments was determined. The optimum growth for C. vulgaris was obtained at pH 6.5 under light intensity of 110 μE m-2 s-1 and one and a half times the concentration of the Chu-10D. Compared to this, the optimum growth for A. variabilis was obtained at 7.0 pH, 90 μE m-2 s-1 light intensity and normal Chu 10D. Both organisms were grown at 25o C temperature. Aeration of medium showed a significant positive growth for both the isolates. Supplementation of medium with vitamin B1, B6, B7 and B12 would yield higher biomass of C. vulgaris as biofuel feedstock. Vitamins were not required for growing A. variabilis. Asiat. Soc. Bangladesh, Sci. 42(2): 191-200, December 2016

scholarly journals Morphological and Physiological Properties of Greenhouse-Grown Cucumber Seedlings as Influenced by Supplementary Light-Emitting Diodes with Same Daily Light Integral

Horticulturae ◽  
2021 ◽  
Vol 7 (10) ◽  
pp. 361
Author(s):  
Zhengnan Yan ◽  
Long Wang ◽  
Yifei Wang ◽  
Yangyang Chu ◽  
Duo Lin ◽  
...  
Keyword(s):  
Light Intensity ◽  
Light Emitting Diodes ◽  
Root Surface Area ◽  
Light Emitting ◽  
Cucumber Seedlings ◽  
Daily Light Integral ◽  
Physiological Properties ◽  
Light Duration ◽  
Light Integral

Insufficient light in autumn–winter may prolong the production periods and reduce the quality of plug seedlings grown in greenhouses. Additionally, there is no optimal protocol for supplementary light strategies when providing the same amount of light for plug seedling production. This study was conducted to determine the influences of combinations of supplementary light intensity and light duration with the same daily light integral (DLI) on the morphological and physiological properties of cucumber seedlings (Cucumis sativus L. cv. Tianjiao No. 5) grown in a greenhouse. A supplementary light with the same DLI of 6.0 mol m−2 d−1 was applied with the light duration set to 6, 8, 10, or 12 h d−1 provided by light-emitting diodes (LEDs), and cucumber seedlings grown with sunlight only were set as the control. The results indicated that increasing DLI using supplementary light promoted the growth and development of cucumber seedlings over those grown without supplementary light; however, opposite trends were observed in the superoxide dismutase (SOD) and catalase (CAT) activities. Under equal DLI, increasing the supplementary light duration from 6 to 10 h d−1 increased the root surface area (66.8%), shoot dry weight (24.0%), seedling quality index (237.0%), root activity (60.0%), and stem firmness (27.2%) of the cucumber seedlings. The specific leaf area of the cucumber seedlings decreased quadratically with an increase in supplementary light duration, and an opposite trend was exhibited for the stem diameter of the cucumber seedlings. In summary, increased DLI or longer light duration combined with lower light intensity with equal DLI provided by supplementary light in insufficient sunlight seasons improved the quality of the cucumber seedlings through the modification of the root architecture and stem firmness, increasing the mechanical strength of the cucumber seedlings for transplanting.

scholarly journals View on a mechanistic model of Chlorella vulgaris in incubated shake flasks

2021 ◽  
Author(s):  
Fabian Kuhfuß ◽  
Veronika Gassenmeier ◽  
Sahar Deppe ◽  
George Ifrim ◽  
Tanja Hernández Rodríguez ◽  
...  
Keyword(s):  
Chlorella Vulgaris ◽  
Growth Models ◽  
Mechanistic Model ◽  
Estimation Procedure ◽  
Model Parameters ◽  
Data Sets ◽  
Related Model ◽  
Kinetic Growth ◽  
Light Intensities ◽  
Shake Flasks

Abstract Kinetic growth models are a useful tool for a better understanding of microalgal cultivation and for optimizing cultivation conditions. The evaluation of such models requires experimental data that is laborious to generate in bioreactor settings. The experimental shake flask setting used in this study allows to run 12 experiments at the same time, with 6 individual light intensities and light durations. This way, 54 biomass data sets were generated for the cultivation of the microalgae Chlorella vulgaris. To identify the model parameters, a stepwise parameter estimation procedure was applied. First, light-associated model parameters were estimated using additional measurements of local light intensities at differ heights within medium at different biomass concentrations. Next, substrate related model parameters were estimated, using experiments for which biomass and nitrate data were provided. Afterwards, growth-related model parameters were estimated by application of an extensive cross validation procedure. Graphic abstract

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