| 单词 |
cyanobacterium |
| 释义 |
cyanobacterium, n. Biol.|ˌsaɪənəʊbækˈtɪərɪəm|
Also Cyanobacterium. Pl. cyanobacteria.
[mod.L., f. cyano- + bacterium n.]
Any of a division of prokaryotic micro-organisms that contain chlorophyll (green) and phycocyanin (blue), produce free oxygen in photosynthesis, and occur widely in unicellular, filamentous, and colonial forms; also called blue-green alga. Usu. in pl.
1973Proc. Nat. Acad. Sci. LXX. 3133/1 Allophycocyanin appears to be the most efficient light-harvesting pigment in all the cyanobacteria that we have examined. 1975Nature 9 Oct. 489/2 Profound differences in structure and function separate the prokaryotic cyanobacteria (blue-green algae) from eukaryotic algae and plants. 1977Sci. Amer. Mar. 71/1 Another symbiosis involves a small aquatic fern, Azolla, and a cyanobacterium that is capable of both photosynthesis and nitrogen fixation. Occupying cavities in the fern leaves, the cyanobacterium supplies nutrients that enable the fern to propagate in waters deficient in fixed nitrogen. 1981D. J. & T. J. Bellamy Bellamy's Backyard Safari 13 The Cyanobacteria, or blue-green algae as they used to be called are far commoner members of the garden scene than plastic gnomes. 1984Times Lit. Suppl. 10 Aug. 903/3 Atmospheric oxygen was produced by cyanobacteria, a kind of bacteria which used to be called ‘blue green algae’. 1987Singleton & Sainsbury Dict. Microbiol. & Molecular Biol. (ed. 2) 244/1 The taxonomy of the cyanobacteria is confused. Until quite recently they were regarded as algae and were therefore subject to the Botanical Code of nomenclature. 1989B. Alberts et al. Molecular Biol. Cell (ed. 2) vii. 366 The evolution of cyanobacteria from more primitive photosynthetic bacteria first made possible the development of aerobic life forms.
Hence ˌcyanobacˈterial a., of or pertaining to a cyanobacterium or cyanobacteria.
1974R. Y. Stanier in Carlile & Skehel Evol. in Microbial World 236 Although the cryptophytes also use phycobiliproteins as light-harvesting pigments, their chloroplasts differ in many structural and functional respects from those of rhodophytes..and cannot plausibly be ascribed a cyanobacterial derivation. 1989B. Alberts et al. Molecular Biol. Cell (ed. 2) vii. 386 (caption) Oxygen respiration..seems to have evolved independently in the green, purple, and blue-green (cyanobacterial) lines of photosynthetic bacteria. |
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