Radiation Characteristics of Filamentous Cyanobacteria Anabaena Cylindrica

摘要

This study presents the spectral radiation characteristics and optical properties of filamentous cyanobacteria Anabaena cylindrica from 400 to 750 nm. A polar nephelometer was used to measure the scattering phase function of the cyanobacteria suspension at 633 nm. The spectral average mass scattering and absorption cross-sections were measured in the photosynthetically active radiative (PAR) region at three different biomass concentrations after 12 days of growth. The absorption cross-sections featured peaks corresponding to chlorophyll a (Chl a) at 435 and 676 nm and phycocyanin (PCCN) at 630 nm. The real and imaginary parts of the complex index of refraction of A. cylindrica were retrieved via an inverse method by treating them as infinitely long and randomly oriented cylinders with a volume-equivalent diameter distribution. The results can be used in conjunction with the radiative transport analysis to predict and optimize light transfer in photobioreactors so as to maximize microalgae growth.