| 单词 | xylem |
| 释义 | xylem noun[U] biologyspecializeduk/ˈzaɪ.ləm/us/ˈzaɪ.ləm/thetypeofplanttissuethatcarrieswaterandmineralsfrom therootsto theleavesand givessupportto thestemortrunk （植物的）木质部Compare phloemspecialized Biochemistry
xylem| American Dictionaryxylem noun[U] us/ˈzɑɪ·ləm,-lem/biology theplanttissuethatcarrieswaterfrom therootsto theleavesand givesstrengthto thestemortrunk Examplesofxylemxylem This may open the way to finding relatively distinct growth rings in thexylemof some evergreen species in these forests. From theCambridge English Corpus The influence of these nematodes on cytokinins in the host'sxylemexudate was not nearly so pronounced. From theCambridge English Corpus In tangential section, preserved rays in the secondaryxylemare relatively low (mean height: 86.9 m) compared to those of other specimens. From theCambridge English Corpus But the same increase would double the food supply for axylem-feeding insect. From theCambridge English Corpus Most bark was eaten down to thexylemand the volume eaten was estimated from the mean bark thickness. From theCambridge English Corpus The entire feeding areas were outlined, irrespective of depth, but feeding marks generally extended down to thexylemon the feeding substrate used. From theCambridge English Corpus Secondaryxylemranges from 1.2 to 2 mm in thickness and is relatively evenly distributed around the primary strands. From theCambridge English Corpus Features of the secondaryxylemin radial section are not easily observed due to mineralization of the cell walls. From theCambridge English Corpus As the tissues dehydrate, leaves shrink, chlorophyll is degraded, sucrose accumulates, thexylemcavitates eventually and the plants become desiccated. From theCambridge English Corpus In transverse section, primaryxylemstrands rarely exceed 300 m in their smallest dimension and 2.5 mm in the largest. From theCambridge English Corpus The secondxylemelement is of the dense, helicoidal type, which occurs in bundles comprised of numerous individuals, and remains active until maturity. From theCambridge English Corpus Vascular bundles show a large number ofxylemvessels of different diameter. From theCambridge English Corpus Stomatal sensitivity to abscisic acid imported from thexylemsap. From theCambridge English Corpus In particular, spittlebugs should be susceptible to manipulation ofxylemtransport solutes. From theCambridge English Corpus Trends in wood density and structure are linked to prevention ofxylemimplosion by negative pressure. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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