牙根

The 54 accessions were classified into five major groups:Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴ by cluster analysis using UPGMA, which showed significant relationship with the origin regions of accessions. Genetic differentiation between and within eight eco-geographical groups of C.dactylon was estimated by Shannon's diversity index, which showed that 63.81% genetic variance existed within group, and 36.19 % genetic variance was among groups, indicating rather large genetic distances among those germplasm, and there was a correlation between genetic differentiation and eco-geographical habits among the groups.

聚类分析结果表明，52份材料可聚为5类；基于Shannon多样性指数估算了8个狗牙根生态地理类群内和类群间的遗传分化，类群内的遗传变异占总变异的63.81%，类群间的遗传变异占总变异的36.19%，表明这些抗源材料遗传差异较大，各生态地理类群间的遗传分化与其所处的生态地理环境具有一定的相关性。

It is obvious to see using silicon can strengthen drought- resistance of Bermudagrass ,Agrostis Lolium. Pereme, It is help to economize the water resource

可见，硅的施用可增强狗牙根、剪股颖和黑麦草的抗旱性，有利于节约水资源。

A study was carried out to explicate the characteristics of Pb uptake by four herbaceous(Lolium perenne,Cynodon dactylon,Poa annua,Agrostis stolonifera)in acid yellow soils,in order to provide scientific basis for improvement of the ecological environment.

研究4种草本植物(黑麦草、狗牙根、早熟禾、翦股颖)对重金属铅的吸收积累规律，为生态环境建设提供科学依据。

He effect of antibiotics in inducing the formation of apices is to prevent infection of root canal, rather than direct induction. And TGF-β1 might act as an inductive factor in the cell differentiation of the above-mentioned cells.

GF-β1参与了尖周组织的修复过程，可能诱导了成牙本质样细胞、成牙骨质样细胞和骨样细胞的分化，在牙根继续形成中起着重要作用。

Atraumatic restoration treatment is a ideal method for filling cement caries,glass ionomer silver reinforced restorative is a ideal material.

非创伤性充填技术是修复老年人后牙根面龋较理想的方法，银粉玻璃离子是较理想的充填材料。

Bimaxillary protrusion extraction cases, the application implant anchorage appliance, the incisor root resorption evident.

双颌前突拔牙病例，应用种植支抗矫治后，切牙牙根吸收明显。

A bonelike substance covering the root of a tooth .

牙骨质一种覆盖住牙根的骨状物质

The selection of Paulownia fortunei, Ulmus Pumila, Broussonetia papyrifera and Cynodon dacytlon in that serious pollution district was the effective restorative method.

因而在Cd、Pb和Zn严重污染的环境中，选择泡桐、白榆、构树和狗牙根的乔木和草本植物组合是该类污染区植物修复的有效途径。

Result:The rate of C-shape canals was 32.26%,all roots were fused buccally.

结果：62个下颌第二磨牙中C形牙根的发生率为3 2 。2 6%，均在颊侧发生融合。

Distobuccal root canals were found obvious curve out by the rate of 80% in mesiodistal direction, 45% in buccolingual direction.

目的：分析上颌第一恒磨牙根管弯曲发生情况、弯曲位置、弯曲方向及弯曲程度。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。