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KMID : 0880220140520020179
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Journal of Microbiology
2014 Volume.52 No. 2 p.179 ~ p.183
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Effects of Light Intensity on Components and Topographical Structures of Extracellular Polysaccharides from the Cyanobacteria Nostoc sp.
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Hongmei Ge
Ling Xia
Xuping Zhou
Delu Zhang
Chunxiang Hu
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Abstract
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A study on the effects of light intensity (40 and 80 μE/m2/sec) on the components and topographical structures of extracellular polysaccharides (EPS) was carried out in cyanobacteria Nostoc sp.. EPS yield increased with light intensity. However, light intensity did not significantly affect the EPS fractions and monosaccharide composition. Higher light intensity generally resulted in higher protein content of EPS in similar fractions. The topographical structure of EPS, investigated by atomic force microscopy, appeared as spherical lumps, chains and networks. The long chains were observed at higher light intensity. Thus, light intensity affected the yield and nature of EPS.
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KEYWORD
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cyanobacteria, extracellular polysaccharides, light intensity, Nostoc sp., atomic force microscopy
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