单词 | pyrenoid |
释义 | pyrenoidadj.n. Resembling in form the stone of a fruit. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1693 tr. S. Blankaart Physical Dict. (ed. 2) 173 Pyrenoides processus [L. Pyrenoides processus], the Tooth of the second Vertebra.] 1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 1051/1 Pyrenoides,..pyrenoid. 1897 New Sydenham Soc. Lexicon Pyrenoid, kernel-shaped. Anat. Epithet formerly applied to the odontoid process of the axis vertebra. B. n. Botany. A small spherical or elliptical structure found in the chloroplasts of many algae and hornworts, associated with carbon fixation and starch deposition. ΘΚΠ the world > life > biology > substance > cell > cell organelle or contents > [noun] > other organelles or contents raphide1831 body1839 raphid1863 mucigen1874 cell sap1875 globoid1875 raphis1879 pyrenoid1883 mucinogen1884 plastid1885 molluscum corpuscle1886 hyalosome1889 molluscum body1892 statolith1892 dictyosome1893 centrosome1895 Nissl body1898 Nissl granule1898 Nissl substance1899 archespore1901 blepharoplast1907 liposome1910 statocone1910 kinetosome1912 Golgi body1916 kinetoplast1925 lipochondrion1936 microsome1943 kappa1945 Pappenheimer body1947 microbody1954 lysosome1955 siderosome1957 ribosome1958 melanosome1961 cisterna1962 microtubule1962 plasmalemmasome1962 phagolysosome1963 informosome1964 monosome1964 mucocyst1965 peroxisome1965 rhoptry1967 spectrin1968 virosome1970 1883 Science 9 Mar. 148/2 Schmitz finds in the chromatophors of many algæ more or less spherical bodies to which he gives the name of pyrenoids. 1901 G. N. Calkins Protozoa iv. 117 The protoplasm of the Mastigophora usually contains chromatophores in which one or more deeply staining bodies—the pyrenoids—may be found. 1959 J. Clegg Freshwater Life Brit. Isles (ed. 2) 77 The food substance formed..is usually starch, which accumulates round special bodies called pyrenoids embedded in the chloroplasts. 1995 Plant Physiol. 107 1387/1 Algae chloroplasts usually comprise thylakoid membrane stacks consisting of two or more single membranes..and one or more central protein bodies termed pyrenoids. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < adj.n.1858 |
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