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- W2312944979 abstract "The centric diatom Cyclotella cryptica and two strains of the pennate diatom Phaeodactylum tricornutum were grown under low and high light intensities (300 lux and 3,000 lux) over 4–6 weeks. Growth was monitored by repetitive cell count. The culture media were replaced weekly to avoid morphological and biochemical alterations caused by nutrient depletion. The ultrastructure of the cells was examined by transmission electron microscopy. Alterations in the light-harvesting antenna systems were investigated by Western immunoblotting. Both diatoms reduced the plastid area, i.e. decreased the amount of thylakoid lamellae, under high light intensity. The thylakoids still ran in groups of three with parallel orientation within the chloroplasts. The girdle band lamellae were not affected. The amounts of storage compounds and vacuoles increased. SDS-PAGE of total cell protein followed by Western immunoblotting with antisera directed against subunits of the light-harvesting antenna systems of C. cryptica (cc-antiserum) and the cryptophyte Cryptomonas maculata (cmac-antiserum) revealed that both diatoms reduced the amount of antenna polypeptides under increased light intensity. The cc-antiserum immunodecorated two bands with relative molecular masses (M r) of 18,000 and 22,000 in C. cryptica. Both decreased under high light conditions to 67.2±6.1%. Five to seven bands in the M r range of 14,000–27,000 were recognized in P. tricornutum. They decreased to 83±5.3%. Furthermore, the immunolabeling pattern for both strains differed under the two light regimes. The cmac-antiserum immunodecorated two polypeptides with M r of 24,000 and 23,000 in C. cryptica, while both strains of P. tricornutum had five polypeptides in the M r range of 14,000–24,000 that showed some differences in staining intensities between the two strains and in response to the light intensity applied." @default.
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- W2312944979 date "2001-03-01" @default.
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- W2312944979 title "Changes in the photosynthetic apparatus of diatoms in response to low and high light intensities" @default.
- W2312944979 doi "https://doi.org/10.1007/s101230100005" @default.
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