| Nostoc flagelliforme is an edible terrestrial cyanobacterium with great economic and medicinal value. Inliquid suspension culture, light is a limiting factor affecting N. flagelliforme cells growth. Light attenuations of N. flagelliforme cells in the mixotrophic and photoautotrophic cultivation were investigated in order to understand the effects of light on N. flagelliforme cells growth in liquid suspension culture. The results showed that the adapted Lambert-Beer爷s law could well simulate the influences of optical length and cell concentration on light attenuation, and the light attenuation equations of N. flagelliforme cells were established in photoautotrophic and mixotrophic cultivation, respectively. While the concentration ofN. flagelliforme cells density increased, light intensity obtained through N. flagelliforme cells declined in the two culturesystems. Especially, with the increase of optical length, the speed of light attenuation quickened evidently. When the biomassand incident light intensity were identical, the light attenuation in photoautotrophic culture was faster than thatixotrophic culture. For example, when the incident light intensity was 48. |
