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单词 diatom
释义

diatom

/ˈdʌɪətəm /
noun Biology
A single-celled alga which has a cell wall of silica. Many kinds are planktonic, and extensive fossil deposits have been found.
  • Class Bacillariophyceae, division Chromophycota or Heterokontophyta (or phylum Bacillariophyta, kingdom Protista).
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  • The slime molds are now known to be a mixture of three or four unrelated groups, and the oomycetes are now classified in the Chromista, with the diatoms and brown algae.
  • Algae, diatoms, dinoflagellates, and photosynthetic bacteria all belong to this group of organisms.

Derivatives

diatomaceous

/dʌɪətəˈmeɪʃəs / adjective ...
  • Although diatoms are universal in fresh and sea water, they achieve greater importance in high-latitude oceanic areas, as well as in some continental margin basins where they form diatomaceous ooze.
  • Massive, bioturbated terrigenous silty clay and diatomaceous mud dominate sedimentation in the distal ice-shelf environment.
  • ‘The bottom appeared light and clear, a waste of firm diatomaceous [algae-skeleton] ooze,’ said Piccard.

Origin

Mid 19th century: from modern Latin Diatoma (genus name), from Greek diatomos 'cut in two', from diatemnein 'to cut through'.

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更新时间:2024/12/23 13:58:12