查询词典 xylem rays

Bicollateral bundle The arrangement of tissues in the vascular bundles in which the phloem is situated on both sides of the xylem.

双韧维管束：是初生木质部的内，外方都有初生韧皮部分布的一种维管束排列方式。

The secondary xylem of woody plants is a product of the vascular cambium,its formation is a complicated type of plant cell differentiation, including cambium initiation, cambial cell division, cell expansion, secondary wall deposition and programmed cell death.

木本植物的次生木质部是维管形成层的活动产物，其形成过程是植物细胞分化的一种复杂类型，包括维管形成层发生、形成层细胞分裂、分化、细胞扩展、次生壁形成和细胞程序化死亡等阶段。

Our research work is currently focused on the molecular mechanisms of vascular cambium periodicity regulation and secondary xylem development, including cambial cell differentiation, secondary wall formation and programmed cell death.

本实验室以杨树、杜仲等树木作为实验材料，采用剥皮再生创伤系统和整体系统，研究维管形成层活动周期调控及形成层发生、次生木质部细胞分化、次生壁形成和细胞程序死亡的分子机理，为定向改良木材材质提供理论指导。

The cambial cells ceased to divide to produce secondary phloem cells at the end of July, but contineous to produce secondary xylem tissues until mid-August.

杜仲枝条中形成层在3月份开始恢复活动，同时产生木质部和韧皮部。7月底形成层细胞停止分裂，同时停止产生韧皮部，8月中旬停止产生木质部。

The primary studies on insecticidical and fungicidical components of endophytic fungus in Celastrus angulatus have been carried out from September, 2000 to June, 2002.The results are as follows: Taking PDA and Czapek as separating culture medium, 39 strains of endophytic fungus were separated from the bark, phloem and xylem of the root and twig of Celastrus angulatus.

作者于2000年9月至2002年6月对杀虫植物苦皮藤中内生真菌的杀虫杀菌活性物质进行了初步的研究，取得了以下结果：采用常规的内生真菌分离方法，以马铃薯葡萄糖培养基、Czapek培养基为分离用培养基，从苦皮藤根和侧枝的表皮、韧皮部和木质部中分离得到39株内生真菌。

Xylem: Chinese P.chinensis Bge 49.15mg/g, Atlantic Ocean 46.58mg/g, UCB 55.28mg/g. 3.In certain condition, Gas-chromatograms and Mass spectrum are use to identifie phenol. Pistacia vera L .leave contain pyrocatechol 0.7640mg/g, pyrogallol 0.0580mg/g, gallic acid 1.03024mg/g, catechin 0.1040mg/g and coumaric acid by different pre-treatment methods.

采用不同方法提取阿月浑子叶片酚类物质，气相色谱-质谱法对其进行定性与定量分析，阿月浑子叶片中含有邻苯二酚0.7640mg/g；邻苯三酚0.0580mg/g；没食子酸1.3024mg/g；儿茶素0.1040mg/g，香豆酸；确定了最佳的前处理方法。

The primary xylem is diarch.

初生木质部为二原型。

Using electronic microscopy and cytochemical methods, we studied the distribution changes of the cell ergastic substance and development of secondary vascular tissues. Development of secondary vascular tissue took on an inherent rhythm, showing alternation of dormant and differentiated stages in periodicity of one year, and the formation of secondary phloem and xylem was alternate.

利用电镜技术及细胞化学方法，研究了美洲黑杨次生维管组织的发育以及细胞内含物分布的变化，发现次生维管组织的发育具有内在节律性，在年周期中表现为分化期和休眠期交替出现；次生韧皮部与次生木质部交替分化形成。

Total biomass, root morphological index, root activity and the amount of xylem sap excaudate were measured. Results showed that under non-water stress conditions, NH4+-N supply increased the average diameter of rice roots and accumulation of shoot biomass, while NO3--N increased total root absorption area and biomass accumulation in roots.

结果表明，正常水分条件下，NH4+-N促进水稻根系平均直径增大，有利于水稻地上部物质累积；NO3--N则使水稻根系总吸收面积增大，促进根系物质累积；NH4+-N/NO3--N为5/5处理的水稻活跃吸收面积最大，活跃吸收面积比亦最高。

Vascular plants Plants containing differentiated cells forming conducting tissue (vascular tissue, also known as fascicular tissue), which comprises the xylem and phloem.

维管植物：具有能够形成体内运输组织(维管组织：包括木质部和韧皮部)的分化细胞的植物。

Smoking cigarettes adds to the Computer Desk Computer manufacturer computer mouse Computer Computerized collar knitter machine Conduit Bodies construction board Container Bag Control Arm Cooking Thermometer general levels of air pollution as well as damaging our health.

吸烟不仅对健康有害，而且增加空气污染程度。香烟雾含有多种有害物质：不仅有致癌化学物质、有某种能阻止氧气进入血液的气体，还有引起血压增高、心速加快的被称为尼古丁的物质。

He is one of my favorite actors.

他是我最喜欢的男演员之一。