| 单词 | top yeast |
| 释义 | > as lemmastop yeast top yeast n. [compare German Oberhefe (1725 or earlier)] yeast that collects near the surface of a fermenting liquid; top-fermenting yeast. ΚΠ 1735 W. Ellis London & Country Brewer I. ix. 44 He [sc. the private brewer] can skim off his top Yeast and leave his bottom Lees behind, which is what the great Brewer can't so well do. 1855 J. C. Morton Cycl. Agric. II. 1167/2 The bottom-yeast of Bavaria beer is not formed at a lower temperature than 32° Fah., nor at a higher than that of 48°; while the most beautiful Berlin top-yeast is formed at 77°. 1991 S. A. Matz Chem. & Technol. Cereals as Food & Feed (ed. 2) xviii. 613 The cells of top yeast gather in clumps and are carried to the top of the fermenting liquid while the cells of bottom yeast stay suspended in the bulk of the liquid or drift toward the bottom. top yeast Modern science distinguishes two kinds of yeast, surface yeast or top yeast (German oberhefe) and under yeast, sediment yeast, or bottom yeast (German unterhefe), the former propagated by buds, the latter by spores, of the fungus Saccharomyces cerevisiæ. The yeast of beer is used medicinally as an antiseptic and stimulant in low fevers, and as an application to ulcers.extracted from yeastn.< as lemmas |
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