| 单词 | gamma cellulose |
| 释义 | > as lemmasgamma cellulose gamma cellulose n. the portion of a cellulosic material that is soluble in alkaline solution and is not re-precipitated by acids.See also alpha cellulose n. at alpha n. and adj. Compounds 2a, beta cellulose n. at beta n. Additions. ΚΠ 1912 C. F. Cross & E. J. Bevan Res. Cellulose III. ii. 23 The cellulose is fractionated by this treatment into:—α cellulose... β cellulose: soluble and reprecipitated by acids... γ cellulose: not reprecipitated: permanently soluble. 1947 J. Grant Wood Pulp & Allied Products (ed. 2) iii. 28 The point to be emphasized at this stage is that alpha-, beta- and gamma-celluloses have not been proved to be definite compounds..they are merely names given to the products obtained when the analytical operations described in chapter xvii are carried out. 2003 B. Lavédrine et al. Guide Preventive Conservation Photograph Coll. 23 Alpha cellulose must be present in a high proportion in photographic paper, whereas the beta and gamma cellulose content must be less than 4%. < as lemmas |
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