| 释义 |
sub-ˈfraction
[sub- 9.]
1. Math. A fraction of a fraction.
1612W. Colson Gen. Tres., Art Arith. A aa b/2 Subfraction, or fraction of fraction, as ½ of ½. 1817Colebrooke Algebra, etc. 14 Assimilation of sub⁓fractions, or making uniform the fraction of a fraction.
2. Biochem. Any one of the portions into which a fraction may be further divided. Cf. fraction n. 7.
1946Nature 5 Oct. 474/1 The division of the combined cystine in wool into four sub-fractions of different chemical reactivity. 1962V. N. Orekhovich et al. in A. Pirie Lens Metabolism Rel. Cataract 324 We succeeded in dividing β-crystallin of cattle lens into β1- and β2-crystallin..and γ-crystallin was divided into three sub-fractions. 1978Jrnl. Neurochem. XXX. 563 A subfraction, derived from the microsomal fraction of rat cerebral cortex,..appears to be enriched in receptor sites for a number of potential neurotransmitters.
Hence ˌsubfractioˈnation Biochem., the process of separating a fraction into further components.
1955Biochem. Jrnl. LX. 615/1 This subfractionation has not brought to light any enzymic heterogeneity in the granules. 1978Jrnl. Neurochem. XXX. 783 The possibility that these findings might reflect merely contamination of myelin with other membranes was tested by subfractionation. |