yield of root

There is about 85 percent of root biomass which distributes between 0-60 cm in the Yellow River bank protection forest.

结果表明:护岸林约有85%的根量分布在0~60 cm的范围内,是无林地即芦苇地根量的2~3倍;护岸林林地0~60cm范围内的土壤密度远远小于芦苇地的土壤密度,土壤饱和导水率较对照区有所提高;林地根量的增加,使土壤变的更加疏松、透气、透水,降低了土壤pH值,增加了土壤养分的来源,提高了土壤有机质和多种营养元素的含量,增强了土壤抵抗水土流失的能力。

The study on distribution characteristics of the root system and root biomass of Ulmus pumila in Yanerwo scenery site of Urumqi was conducted by excavating method.

采用挖掘法对乌鲁木齐市燕尔窝地区古白榆树的根系及根量分布特征进行了研究。

The changes and breeding meaning of root quantity and activity of root system of Yumai 54 and other 11 winter wheat varieties or strains in their different bearing period were studied in detail.

利用“豫麦 54号”等 1 2个冬小麦品种或品系为材料 ,对其不同生育时期的根量、根系活力的系统变化及育种意义进行了详细的研究。

The factors of root resorption during orthodontic treatment;

正畸治疗中牙根吸收的影响因素

Influence on root resorption by distalizing molars with face bow;

口外弓推磨牙远移对牙根吸收的影响

Root resorption observation of molars distalized by face bow using dental positioning films;

根尖定位片定量观测推磨牙远移后牙根吸收

ObjectiveThe characters about maxillary canines movement style, movement rate, external apical root resorption and alveolar bone height were compared when they retracted into different healing extraction sites, to select a clinical optimal time of tooth movement.

目的： 通过曲面体层片、根尖定位片和牙(牙合)模型的测量和分析，比较上颌尖牙在不同愈合期拔牙区内的移动特征、移动速度，并对不同愈合期拔牙区内移动的上颌尖牙的根尖吸收、牙槽骨高度进行评估。

The Observation of Primary Molars of the Rabbit:the Dental Formula,Physiological Root Resorption of the Second Primary Molar

家兔乳恒磨牙齿式及下颌乳磨牙牙根吸收规律的观察

Validity research of panoramic radiograph in diagnosing the root resorption of incisors caused by impacted maxillary canines

曲面断层片诊断阻生上颌尖牙造成的切牙牙根吸收的有效性研究

Establishment of the animal model of tooth root resorption under continuous heavy intrusive force

持续性压低重力致牙根吸收动物模型的建立

CLINICAL STUDY OF THE INFLUENCE ON ROOT RESORPTION BY FLAT BITE PLATE TREATMENT DURING DIFFERENT GROWTH PERIOD

不同生长期平导对牙根吸收影响的比较研究

Factors and diagnosis of root resorption following orthodontic treatment

正畸治疗导致牙根吸收的影响因素和诊断评估

Risk Factors for Apical Root Resorption of Maxillary Cetral Incisors in Orthodontic Treatment;

正畸治疗中上颌中切牙牙根吸收的可疑相关因素分析

Expression of DSPP、DSP in Gingival Crevicular Fluid of Rat during Root Resorption Fllowing Experimental Tooth Movement

大鼠实验性牙移动致牙根吸收龈沟液中DSPP、DSP的表达

Study of alveolar ridge Absorption and root resorption during orthodontic treatment

正畸患者矫治前后牙槽嵴和牙根吸收的调查研究

Relationship Between the Level of Matrix Metalloproteinase-2 in Gingival Crevicular Fluid and Orthodontic Root Resorption

大鼠牙移动过程中龈沟液MMP-2含量与牙根吸收的相关性研究

Research Progress of Matrix Metalloproteinases and Tissue Inhibitor of Metalloproteinases in Root Absorbion

基质金属蛋白酶及其抑制剂与牙根吸收的研究进展

Effect of age factor on the root absorption of anchorage teeth

正畸治疗中年龄对支抗牙根吸收影响的临床研究

Relativity of MMPs in GCF and Orthodontic Root Resorption of Rats in Different Age Groups;

龈沟液中MMPs含量与不同年龄组大鼠正畸牙根吸收的相关性研究

Influencing Factors of Root Resorption after Straight Wire and Edgewise Appliance Combined with Flat Bite Plate Treatment

固定矫治器配合使用平面导板对牙根吸收的影响因素分析

Conclusion On the resorbing surface of human deciduous teeth there are large amount of osteoclasts which can be used as a source of studying human osteoclast.

结论人滞留乳牙牙根吸收面存在大量的破骨细胞,是研究人破骨细胞的一个来源。

Study on Establishment Animal Model of Root Resorption during Tooth Movement and the Self-repair Characteristics after Resorption

正畸牙齿移动过程中牙根吸收动物模型的建立及其自行修复性的研究

Relationship between the level of matrixmetalloproteinase-9 in gingival crevicular fluid and orthodontic root resorption

龈沟液中基质金属蛋白酶-9含量与正畸牙根吸收相关性的实验研究

A clinical investigation of orthodontically induced external apical root resorption

正畸治疗导致牙根外吸收的临床分析

When absorption of alveolar bones around a single root abutment reached 20%,its stress was concentrated.

当一侧单根基牙牙槽骨吸收达20%时,此基牙出现应力集中;