| 单词 |
Protococcus |
| 释义 |
‖ Protococcus Bot.|prəʊtəʊˈkɒkəs|
Pl. protococci |-ˈkɒksaɪ|.
[f. Gr. πρῶτο-ς first, primary (see proto-) + κόκκος grain, seed.]
A genus of microscopic unicellular algæ, of spheroidal form.
The common species P. viridis is abundant everywhere on trunks of trees, old palings, walls, etc., forming green patches or layers; P. nivalis is an alpine species constituting the so-called ‘red snow’.
1842Penny Cycl. XXII. 168/1 A field of green snow..accompanied..with the Protococcus, giving a red colour. 1860H. Spencer in Westm. Rev. Jan. 97. 1875 Huxley & Martin Elem. Biol. (1883) 16 Get some water that is quite green from containing a large quantity of Protococcus.
Hence protoˈcoccal a., of or pertaining to Protococcus; protoˈcoccoid, protocoˈccoidal adjs., having the form of or resembling Protococcus.
1879Jrnl. Quekett Microsc. Club 46 My impression,..from an examination of many Amœbæ, is that they are the results of changes from the Protococcal state. 1965F. E. Round Biol. Algae i. 3 The unicells may be sub-divided into non-motile (Protococcoidal), ‘amoeba’-like (Rhizopodial) and motile cells (Flagellate). 1967M. E. Hale Biol. Lichens iii. 45 The common protococcoid algae are soon killed off by the fungus. |
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