Application of light emitting diodes as a light source to a photosynthetic culture of Chlorobium thiosulfatophilum

Kim, Byung Woo; Kim, Eun Han; Chang, Ho Nam

doi:10.1007/bf00185011

Cited by 8 publications

(2 citation statements)

References 5 publications

(2 reference statements)

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“…LEDs have many advantages over other light sources, including high irradiance output with low heat dissipation, long lifetime, small size, and a high capacity to control the spectral composition (Lee and Palsson 1995;Morrow 2008;Olsson et al 2007), and they have been widely adopted in Values are the means ± SD (n=6) Φ PSII effective quantum yield, α the initial slop, rETR max relative electron transport rate at light saturation, E k (μmol photons m −2 s −1 ) irradiance at onset of light saturation cultivation of higher plants and microalgae (Kim et al 1991;Lee and Palsson 1995;Wang et al 2007). In this study, blue light was provided by LEDs, and they were shown to be highly efficient for both gametophyte reproduction and sporeling growth in S. japonica.…”

Section: Discussionmentioning

confidence: 99%

Effect of blue light on indoor seedling culture of Saccharina japonica (Phaeophyta)

et al. 2010

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Saccharina japonica is a brown alga that has been commercially cultured on a large scale in China. Integrating the light condition under seawater and the adaptation of Saccharina to this condition, it is expected that blue light would be beneficial to Saccharina culture system. Consequently, the detailed effect of blue light on the key stages during indoor seedling culture of S. japonica was investigated in this study. Irradiances and light qualities had little effect on zoospore attachment and germination. Egg formation occurred sooner under blue light than white light. Under optimum irradiances, 95±4% female gametophytes gave rise to eggs in 6 d under blue light, while it took 12 d for over 90% formation of eggs under white light. Over a culture period of 3 weeks, mean sporeling length and width under blue light was 1.39 and 1.56 times of that under white light, respectively, while the mean sporeling size obtained under red light was only 25% of that under white light. The higher growth rate under blue light was largely due to higher photosynthetic efficiency, as indicated by chlorophyll fluorescence of photosystem II. In addition, the mean ratio of sporeling width to length under blue light was significantly higher than that under white light. These results suggest that blue light would be superior to white light for indoor seedling culture of S. japonica. Based on these findings, an improved S. japonica seedling culture system is discussed.

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Section: Discussionmentioning

confidence: 99%

Effect of blue light on indoor seedling culture of Saccharina japonica (Phaeophyta)

et al. 2010

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“…The bacteria can be suspended in a liquid phase or immobilized on different carriers. By comparison of the bioconversion of H 2 S to elemental sulfur using Chlorobium thiosulfatophilum cultivated in suspension or immobilized in alginate carrier, it was found that the fixed cells consumed 30% less light energy than the free cells at the removal rate of H 2 S 68 mg/(L h) (Kim and Chang, 1991a).…”

Section: Bioreactors For Desulfurization Using Phototrophic Bacteriamentioning

confidence: 99%

Sulfur-oxidizing bacteria in environmental technology

Pokorná

Zábranská

2015

Biotechnology Advances

335

124

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Growth kinetics of the photosynthetic bacterium Chlorobium thiosulfatophilum in a fed‐batch reactor

Kim

Chang

Kim

et al. 1992

Biotech & Bioengineering

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Hydrogen sulfide dissolved in water can be converted to elementary sulfur or sulfate by the photosynthetic bacterium Chlorobium thiosulfatophilum. Substrate inhibition occurred at sulfide concentrations above 5.7 mM. Light inhibition was found at average light intensities of 40,000 lux in a sulfide concentration of 5 mM, where no substrate inhibition occurred. Light intensity, the most important growth parameter, was attenuated through both scattering by sulfur particles and absorption by the cells. Average cell and sulfur particle sizes were 1.1 and 9.4 microm, respectively. Cells contributed 10 times as much to the turbidity as sulfur particles of the same weight concentration. The light attenuation factor was mathematically modeled, considering both the absorption and scattering effects based on the Beer-Lambert law and the Rayleigh theory, which were introduced to the cell growth model. Optimal operational conditions relating feed rate vs. light intensity were obtained to suppress the accumulation of sulfate and sulfide and save light energy for 2- and 4-L fed-batch reactors. Light intensity should be greater for the same performance (H(2)S removal rate/unit cell concentration) in larger reactors due to the scaleup effect on light transmission. Knowledge of appropriate growth kinetics in photosynthetic fed-batch reactors was essential to increase feed rate and light intensity and therefore cell growth. A mathematical model was developed that describes the cell growth by considering the light attenuation factor due to scattering and absorption and the crowding effect of the cells. This model was in good agreement with the experimental results.

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Application of light emitting diodes as a light source to a photosynthetic culture of Chlorobium thiosulfatophilum

Cited by 8 publications

References 5 publications

Effect of blue light on indoor seedling culture of Saccharina japonica (Phaeophyta)

Effect of blue light on indoor seedling culture of Saccharina japonica (Phaeophyta)

Sulfur-oxidizing bacteria in environmental technology

Growth kinetics of the photosynthetic bacterium Chlorobium thiosulfatophilum in a fed‐batch reactor

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