| 单词 | octa- |
| 释义 | octa-|ˈɒktə|
Gr. ὀκτα-, comb. form of ὀκτώ eight, with which it varies in some words. Most of the English derivatives of octa- appear in their places as main words; the following are of minor importance: octachronous |-ˈækrənəs| a. Pros. [Gr. χρόνος time] = octasemic. octacolic |-ˈkɒlɪk| a. Pros. [colon2], consisting of eight cola. octaphonic |-ˈfɒnɪk| a. Mus. [Gr. ϕωνή voice, sound], composed in eight parts. octapodic |-ˈpɒdɪk| a. Pros. [Gr. ὀκταπόδ-ης, ὀκτάπους, -ποδ- eight-footed], containing eight metrical feet; octapody |-ˈæpədɪ|, a verse of eight feet. octasemic |-ˈsiːmɪk| a. Pros. [L. octasēmus, Gr. ὀκτάσηµος], containing eight moræ or units of time. octastrophic |-ˈstrɒfɪk| a. Pros., consisting of eight strophes or stanzas.
1900H. W. Smyth Greek Metric Poets 195 We might arrange (the passage) in Octapodies.
b. In Chem. octa-, oct- (sometimes octo-) indicates the presence of eight atoms or units of an element or radical, as in octacarbon, octachloride, octammonio-; octadecanol, any of the alcohols with the formula C18H37OH; spec. normal (or n-) octadecanol, a crystalline primary alcohol which is present in whale and dolphin oils, also called stearyl alcohol; octaˈpeptide, any peptide composed of eight amino-acid residues.
1877Octachloride [see octad 3].
1914Jrnl. Chem. Soc. CV. 2233 The acetates of the dextrorotatory carbinols from ethylbutylcarbinol (γ-heptanol) on to ethylpentadecylcarbinol (γ-octadecanol) are all of negative rotation. 1949E. Chain in H. W. Florey et al. Antibiotics II. xvii. 709 Antifoam reagent (3 per cent. octadecanol in lard oil). 1970Chem. & Physics Lipids IV. 246 The major long-chain alcohols found in heart and brain tissues are hexadecanol, octadecanol and octadecenol. 1873Watts Fownes' Chem. (ed. 11) 425 The octammonio⁓diplatinic compounds consist of double molecules of tetrammonio-platinic compounds having two or more molecules.
1931Chem. Rev. VIII. 390 Curtius..found that when his triglycylglycine ester was heated to 100°C. in vacuo it was converted into an insoluble infusible material having the composition—NHCH2CO—. He assigned to this material the structure of a cyclic octapeptide, but a much more highly polymeric open chain structure seems more probable. 1957Science 3 May 886/1 (heading) Synthesis and pharmacology of the octapeptide angiotonin. 1972Lancet 17 June 1320/1 The superb work of Wieland and his school established that the toxins are either cyclic heptapeptides or octapeptides. |
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