Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition
碩士 === 國立東華大學 === 海洋生物多樣性及演化研究所 === 99 === Filamentous blue-green algae, Nostoc flagelliforme was tested for the presence of ultraviolet-absorbing mycosporine-like amino acids (MAAs). The aims of this study were to investigate the effects of long term exposure of different UVB intensities and salini...
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ndltd-TW-099NDHU52700322015-10-13T20:46:53Z http://ndltd.ncl.edu.tw/handle/30585002301009904000 Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition 紫外線B與鹽度對液態培養之髮菜產生類蕈孢素胺基酸的影響 Tsung-Han Tu 杜宗翰 碩士 國立東華大學 海洋生物多樣性及演化研究所 99 Filamentous blue-green algae, Nostoc flagelliforme was tested for the presence of ultraviolet-absorbing mycosporine-like amino acids (MAAs). The aims of this study were to investigate the effects of long term exposure of different UVB intensities and salinity on chlorophyll a, MAAs both inside the cell and in culture medium, respectively. Results of chlorophyll a indicated that exposure to UVB irradiation and 20 mM NaCl enhanced the growth of N. flagelliforme, but in 260 mM NaCl, growth was inhibited. The increment of algal MAAs was proportional to the increment of UVB intensity and salinity. Releasing of MAAs in culture medium increased with the increasing of salinity, but not with UVB. Results of different concentrations of algae exposed to UVB revealed that higher concentration of N. flagelliforme adapted better to the irradiation. In low salinity, higher exposure of UVB increased growth in N. flagelliforme, but not under high salinity, which suggested that salinity was the main cause of the increment of chlorophyll a in N. flagelliforme. Synthesizing of MAAs in N. flagelliforme was the highest under simultaneous high UVB radiation and high salinity. Under different photoperiod with the irradiation of UVB resulted in less chlorophyll a and algal MAAs, but higher MAAs in the medium when exposed to 24 hr of light. It showed that the longer N. flagelliforme was exposed to the light, the more inhibition was on the growth, but at the same time it helped in releasing MAAs. Kwee-Siong Tew 張桂祥 2011 學位論文 ; thesis 62 zh-TW |
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碩士 === 國立東華大學 === 海洋生物多樣性及演化研究所 === 99 === Filamentous blue-green algae, Nostoc flagelliforme was tested for the presence of ultraviolet-absorbing mycosporine-like amino acids (MAAs). The aims of this study were to investigate the effects of long term exposure of different UVB intensities and salinity on chlorophyll a, MAAs both inside the cell and in culture medium, respectively. Results of chlorophyll a indicated that exposure to UVB irradiation and 20 mM NaCl enhanced the growth of N. flagelliforme, but in 260 mM NaCl, growth was inhibited. The increment of algal MAAs was proportional to the increment of UVB intensity and salinity. Releasing of MAAs in culture medium increased with the increasing of salinity, but not with UVB. Results of different concentrations of algae exposed to UVB revealed that higher concentration of N. flagelliforme adapted better to the irradiation. In low salinity, higher exposure of UVB increased growth in N. flagelliforme, but not under high salinity, which suggested that salinity was the main cause of the increment of chlorophyll a in N. flagelliforme. Synthesizing of MAAs in N. flagelliforme was the highest under simultaneous high UVB radiation and high salinity. Under different photoperiod with the irradiation of UVB resulted in less chlorophyll a and algal MAAs, but higher MAAs in the medium when exposed to 24 hr of light. It showed that the longer N. flagelliforme was exposed to the light, the more inhibition was on the growth, but at the same time it helped in releasing MAAs.
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author2 |
Kwee-Siong Tew |
author_facet |
Kwee-Siong Tew Tsung-Han Tu 杜宗翰 |
author |
Tsung-Han Tu 杜宗翰 |
spellingShingle |
Tsung-Han Tu 杜宗翰 Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
author_sort |
Tsung-Han Tu |
title |
Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
title_short |
Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
title_full |
Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
title_fullStr |
Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
title_full_unstemmed |
Effects of ultraviolet-B and salinity on the synthesis of mycosporine-like amino acids (MAAs) from Nostoc flagelliforme in aquatic condition |
title_sort |
effects of ultraviolet-b and salinity on the synthesis of mycosporine-like amino acids (maas) from nostoc flagelliforme in aquatic condition |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/30585002301009904000 |
work_keys_str_mv |
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