Kinetic modeling of the light‐dependent photosynthetic activity of the green microalga Chlorella vulgaris

Abstract

Light-dependent photosynthesis of Chlorella vulgaris was investigated by using a novel photosynthesis measurement system that could cover wide ranges of incident light and cell density and reproduce accurate readings. Various photosynthesis models, which have been reported elsewhere, were classified and/or reformulated based upon the underlying hypotheses of the light dependence of the algal photosynthesis. Four types of models were derived, which contained distinct light-related variables such as the average or local photon flux density (APFD or LPFD) and the average or local photon absorption rate (APAR or LPAR). According to our experimental results, the LPFD and LPAR models could predict the experimental data more accurately although the APFD and APAR models have been widely used for the kinetic study of microalgal photosynthesis.

Photosynthesis of Scenedesmus obliquus in outdoor open thin-layer cascade system in high and low CO2 in Belgium

“…Transmittance was determined by averaging the light transmission in the PAR region (400-700nm) of culture samples at densities ranging from 0.05 to 2.5 g.l −1 . Line: fit of the hyperbolic Beer-Lambert law (Yun and Park, 2003;Béchet et al, 2013). …”

Algal Biosensor-Based Measurement System for Rapid Toxicity Detection

“…For estimation of algal photosynthetic activity, a general photosynthesis-irradiance model (Yun & Park, 2003) can be applied…”

Technical insight on the requirements for CO2-saturated growth of microalgae in photobioreactors

“…Light, which drives the photochemical reactions to produce usable energy for carbon fixation in algal photosynthesis, has been researched utmost to maximize the rate of photosynthesis in photobioreactors, where the cells are often light-limited due to self shading (Olivieri et al 2014). Mathematical models of photosynthesis-light relationship, description of light regime (periodic variations in light intensity experienced by individual cells as they traverse through light gradient inside culture), and prediction of photosynthetic response to light regime are the cornerstones of photobioreactor engineering (Brindley et al 2011;Fernández et al 1997;Molina-Grima et al 1999;Merchuk et al 2007;Pottier et al 2005;Pruvost et al 2008;Yun and Park 2003). Carbon dioxide-the carbon source-is another crucial factor affecting photoautotrophic growth.…”