根

The effect of Scirpus mariqueter on phosphorous distribution in intertidal sediments was examined by measuring the phosphorous concentration in near-root, mean-root and far-root sediments at different depths in three cores, with application of the theory of rhizospherical microbe.

以海三棱藨草为例，运用实验模拟的方法，通过根际、近根和远根沉积物的对比分析，运用根际微生物作用理论，研究了大型植物对潮滩沉积物磷分布及迁移转化的影响。

It was shown that the root elongation was inhibited and the malonaldehyde content in root apices and the antioxidase activities of root apices were increased under Al stress (30 μmol/L), while the effects of Al were significantly alleviated by the addition of Si (1.4 mmol/L). Moreover, both Si added before Al treatment and Si added simultaneously with Al treatment could alleviate these effects. On the other hand, the cultivar of Seca was shown to be more sensitive to Al than other cultivars in the absent of Si, while Al-resistance distinction among the cultivars of stylosanthes turned to be non-significant in the present of Si in the pre-cultured solution or both pre-cultured and Al-treatment solutions.

研究结果表明，在铝(30 μmol/L)胁迫条件下柱花草根伸长受阻、根尖丙二醛含量和抗氧化酶活性显著增加，而硅(1.4 mmol/L)处理增加根中硅的含量而降低了铝对根伸长、MDA含量和抗氧化酶活性的影响，且铝处理前12h供给的硅和前处理溶液及铝溶液中均加硅处理的影响均显著；在不加硅条件下西卡品种的耐铝性显著低于其它品种，而经硅预处理的植株和在预处理及铝处理期间均供应硅的植株的耐铝性不同品种间的差异不显著。

The influencing tendency,principle of action and the extent of influence of eight factors effecting on the undercutting of external toothing involute columnar gear are discussed.

讨论了外啮合渐开线圆柱齿轮根切的全部共8个影响因素的影响倾向、作用原理和影响程度，给出了一个新参数——根切系数，用以衡量根切倾向的大小，使对渐开线齿轮根切的产生条件的认识更为全面。

The root system in the cortex of the host stem has a few branches and highly simplified stele of original triarch vascular bundles. The haustrium root system, which is from the root system in the cortex of a host stem enters the vascular tissues as finger-like body from the vascular rays and then to become hyphae-like body among the vascular cells.

皮层根有少数分枝，无次生结构，中柱结构高度简化，从胚根的结构可看出其初生木质部原先是三原型的；吸器根从皮层根上发生，进入寄主维管射线中，再进入维管组织内，并形成许多丝状体。

A pot experiment was conducted with two soybean varieties (Di2003-1 and Hefeng25) and two main soil types in Heilongjiang Province to study the interactive effects of variety and soil type on the root morphology and nodule traits of soybean plants. Root samples were collected at the fifth trifoliolate stage, bloom-beginning stage, pod-beginning stage, full pod stage, seed-beginning stage, full seed stage, and full maturity stage for the analysis of root dry mass, root length, root surface area, average root diameter, nodule number, nodule fresh mass, and mass per nodule.

选取黑龙江省2种主要农田土壤类型和2个大豆品种（滴2003-1和合丰25），采用盆栽试验，分别于大豆第5片复叶展开期、初花期、结荚初期、结荚盛期、鼓粒初期、鼓粒期和完熟期取样，进行根系形态（根干质量、根长、根表面积和平均根直径等）和根瘤性状（根瘤数、根瘤鲜质量和单个根瘤质量）的动态分析，以研究品种和土壤类型对大豆根系形态特征的影响。

RCT can be divided into 3 steps, including root canal preparation, root canal disinfection, and root canal obstruction, of which the canal obstruction is very important, for the treatment efficiency will be greatly affected with uncondensed or mislocated obstruction.

根管充填的作用很重要，如果根充不密合、根充不到位等，均会影响根管治疗的成功率。

This paper proceeded the flexural experiment respectively of two flexural strengthen beam by CFS, one compared reinforced concrete beam, and proceed sheared experiment research of two U style stirrups of CFS combined compacted sheared strengthen beam, one compared reinforced concrete beam. analyze and compare some working characters such as width of cracks, the deflection and ultimate moment of an unstrengthen compared beam, an initial strengthen beam and a beam strengthened after crack by compacting .

本文分别进行了2根粘贴碳纤维布受弯加固梁和1根钢筋混凝土对照梁的受弯试验研究及2根碳纤维布U形箍+压条受剪加固梁和1根钢筋混凝土对照梁的受剪试验研究，分析对比了对照梁、直接加固梁、压裂卸荷后再加固梁三者的挠度、裂缝、极限荷载等工作性能。

Seventeen simply supported beams with the dimensions of 150 × 250 × 2600mm include nine secondary-load reinforced concrete beams reinforced by CFRP, six RC beams strengthened with CFRP directly and two unstrengthened control beams were experimentally investigated.

本次试验共设计了17根截面尺寸为150mm×250mm，梁长为2600mm的试验梁，其中9根为碳纤维布加固的具有不同初始荷载的钢筋混凝土梁，6根为碳纤维布直接加固的钢筋混凝土梁，2根为对比钢筋混凝土梁。

Drought stress weakened the rhizosphere effect of ammonifying bacteria.Under drought stress,rhizospheric ammonifying bacterium amount of Baidan31 was very significantly different at seedling and jointing,and significantly different at tasseling-anthesis from that of control.Rhizospheric nitrifying bacteria tended to increase under drought stress.

干旱胁迫减弱了玉米氨化细菌的根际效应，与对照根际氨化细菌数量相比，白单31在苗期和拔节期根际氨化细菌数量受干旱胁迫的影响达极显著水平，在抽雄～开花期达显著水平；根际硝化细菌数量在干旱胁迫下有所增加。

A fully automated simultaneous determination of nitrate and nitrite in water samples by sequential injection analysis based on the Griess diazo-coupling reaction and the formed azo dye for nitrite at 540nm and reduction to nitrite using coppered cadmium column.

用顺序注射分光光度法，通过一次进样。同时测定硝酸根和亚硝酸根。亚硝酸根是根据格里斯重氮－偶联反应，形成偶氮染料后在波长540nm下进行检测。而硝酸根则通过镀铜镉粒还原柱还原为亚硝酸根后进行测定。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。