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fusiform ray
相关语句
  相似匹配句对
     X-ray Detectors
     X射线探测技术
短句来源
     chest X ray.
     X线影像。
短句来源
     The X-ray films show that the external callus is smaller, regular in contour and usually fusiform.
     普通髓内针内固定不够坚强,骨折仍不稳定,骨折血肿较严重,X线显示外骨痂相应地较大、形状不规则,常呈弥漫状阴影。
短句来源
     The wood rays are uniseriate and fusiform and consisted of ray tracheids and ray parenchyma cells.
     木射线由射线管胞和射线薄壁细胞组成,具单列和纺缍形两类射线;
短句来源
     Aexternal fusiform callus were observed in IN.
     IN组骨折断瑞形成梭形的外骨痂。
短句来源
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Describes the wood anatomical features of Pinus henryi and compares with those of P. massoniana and P. tabulaeformis. They are somewhat similar in morphological and wood structural features, but quite different in some wood anatomical features such as number of secretory cells in resin ducts, thickening of inner wall of ray tracheids, number of uniseriate wing cells in fusiform rays and bark features, etc. It was claimed that P, henryi should be considered as an independent species.

本研究对巴山松的木材解剖特性进行了观察、记载和量测,并与油松、马尾松的木材解剖构造作了分析比较。结果表明,巴山松虽在外部形态及木材构造上与油松、马尾松存在某些相似之处,但在树脂道泌脂细胞数、射线管胞内壁加厚程度、纺锤形木射线单列翼细胞数及树皮特征等方面有若干重要差异。作者认为,巴山松作为一个独立的种是成立的。

The wood fossils were collected from Ping一zhuang Coal Mine,Chi一fong city, Inner Mongolia, There are two sets of sediments.The upper one was considered to be Mioeene,Tertiary;the lower one was late Mesozoic,Among the upper one is the bed which contained the wood and other leaves fossils.Three species of wood fossils among them had been identified.They are Pseudotsugaxylon pingzhangensis sp.nov.,Piceaxylon manchuricum Sze. and Pinuxylon sp. Based on the geographic distribution of extant species in Pseudotsuga,the...

The wood fossils were collected from Ping一zhuang Coal Mine,Chi一fong city, Inner Mongolia, There are two sets of sediments.The upper one was considered to be Mioeene,Tertiary;the lower one was late Mesozoic,Among the upper one is the bed which contained the wood and other leaves fossils.Three species of wood fossils among them had been identified.They are Pseudotsugaxylon pingzhangensis sp.nov.,Piceaxylon manchuricum Sze. and Pinuxylon sp. Based on the geographic distribution of extant species in Pseudotsuga,the closely related genus of Pseudotsugaxylon and more than 70 species of leaves fossils,it might indicate that the climate was warm and damp,the precipitation was rich.The type of vegetation was a mixed forestry of meedle and broad leaves in the southem area of Inner Mongolia during the Miocene,Tertiary. Description of Pseudotsugaxylon Gen.nov.J.J.Yang Gross characteristics The fossil wood described here was from tree branch. growth rings distinct,up to 0.4mm in width,transition from earlywood to latewood moderately abrupt or ab- rupt.Minute anatomy Earlywood tracheides rectangular,hexagon or a few polygon mostly invisible(cells being crushed)with tangential diameter 18一22μm and wall thickness 2.2一2.7μm. Bordered pits on radial wall 1 row,sparse but mostly invisible,Spiral thickenings on the axial tracheides walls extremely distinct(very oblique).Latewood cruashed but spiral thickenings visi-ble,Axial parenchyma invisible.Rays of two types, uniseriate and fusifonn:(a)uniseriate rays numerous,8一11 No/mm,9─11μm in width,1─18 plus cells(19─105μm)in height (usually 2─7 plus cells,36─48μm);(b)fusiform rays with radial resin canal8, 26─42μm in width,2─3 horizotial ray cells near the canal, tapering above and below to uniseriate margins similar to(a)ray,up to 2─6plus cells in height.Ray cells orbicular, oval and elliptical containing dark resin,horizontal walls pited, end walls nodular. Pits leading ray cells 4─ 6 per crossfield,taxodioid?and/ or piceoid?,1─3horizotal arrangment(usually2).Ray tracheids,spiral thickenings on in ner walls visible(? ).Resin canals of two types, axial and radial canals:(a)axial canal,2 longitudinal sectioned ones was found on the tangential section but not visible on the transverve section;(b)radial canals with 5─7thick─walled epithelium on the tangential scetion, 0─2 per square millimeter.

木化石采自内蒙古赤峰平庄煤矿。矿区内展布的地层有两套,下部为晚中生代含煤地层,上部为第三系。木化石采自上部第三系,同层具有丰富的叶部化石。现报道的木材化石共3种,平在原始黄杉型木Pseudotsugaxylonpingzhangensissp.nov.,东北云杉型木PiceaxylonmanchuricumSze和松型木Pinuxylonsp.等。其中的原始黄杉型木的最近亲缘属黄杉属。就生存种的地理分布,并综合70多种叶部印痕化石的种属地理分布特征,指示中新世时期内蒙南部地区的气候温暖湿润,雨量颇为丰富,所以森林较为繁盛茂密。其植被为暖温带针阔叶混交林。

This paper deals with the structure of secondary phloem of stems in 14 species and 1 variety of Pinus ,and comparison of two subgenus(haploxylon,Diploxylon)and the different species. The main results are as follows; (1)The structure of secondary phloem is composed of an axial system and a radial system. The main constituents of the axial system are sieve cells, phloem parenchyma cells, crystalliferous cells and radial plates. The radial system is made up of uniseriate rays and fusiform rays containing...

This paper deals with the structure of secondary phloem of stems in 14 species and 1 variety of Pinus ,and comparison of two subgenus(haploxylon,Diploxylon)and the different species. The main results are as follows; (1)The structure of secondary phloem is composed of an axial system and a radial system. The main constituents of the axial system are sieve cells, phloem parenchyma cells, crystalliferous cells and radial plates. The radial system is made up of uniseriate rays and fusiform rays containing horizontal resin canals. Compared with functioning phloem,the constituents of nonfunctioning phloem change greatly in form, structure and arrangement. (2)Some variations within various species have been shown in stratification of secondary phloem, phloem ray dilatation, resin canal density, crystalliferous cell frequency,quantity of ergastic substances in phloem parenchyma cell,phloem ray height, sieve cell length, radial and tangential width, sieve area diagram, height and radial width of upright ray cell, respectively. But no obvious regulation is found. (3) The differences are rather steady between two subgenus in shape and length of crystal, and number of epithelial cells around a resin canal in functioning phloem or phloem just losing its function,which can be served as the further evidence for separation of subgenus.

在光镜下观察了松属(Pinus L.)14种、1变种茎次生韧皮部结构,并对亚属间及一些种间差异进行了比较,主要结果为:(1)各种茎次生韧皮部结构基本一致。次生韧皮部由轴向和径向两个系统构成。轴向系统的主要成分为筛胞、韧皮薄壁组织细胞、含晶细胞和径向片;径向系统由单列和纺锤形两类射线组成。与具功能韧皮部相比,不具功能韧皮部的组成分子在形态、结构及排列上均发生显著变化。(2)次生韧皮部分层现象,射线扩张现象,树脂道密度,含晶细胞频率,韧皮薄壁组织细胞后合物含量,射线高度,以及筛胞长度、径向宽度和弦向宽度,筛域直径,直立射线细胞高度和径向宽度等许多方面存在一定的种间差异,但无明显的规律。(3)两亚属在晶体形状和长度、树脂道上皮细胞数(具功能或刚失去功能的韧皮部)等方面有较稳定的差异,可作为属内分类的进一步证据。

 
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