根

Methods The conditions of solvent extracting active ingredient from pueraria lobata were optimized,and evaluating indIcators were contents of puerarin,lead and mercury, which were determined by high performance liquid chromatography and atomic fluorescence spectrometry.

方法采用高效液相色谱法和原子荧光光谱法测定葛根提取液中葛根素和铅、汞元素的含量，以葛根素和铅、汞元素的含量为评价指标，对影响溶剂回流提取葛根有效成分的条件进行优化。

It showed that Lolium multiflorum can improve soil pH in contrast with natural grass.

林草模式的根际pH值与非根际成显著正相关，自然草模式根际pH值与非根际也呈正相关，但未达到显著水平。

The broken instruments were mostly reamer, file and power-assisted reamer, making up 90.7%. Most of which happened in mesiobuccal canal of maxillary molar and mesial canal of mandibular molar, accounting for 70.7%.

根管预备的过程中可能将扩孔钻、根管锉、倒钩髓针、光滑髓针等根管器械折断在根管内，堵塞管腔而使治疗不能顺利进行。

Methods One hundred and fifteen extracted maxillary first premolars were included in this study. Radiograph of teeth in mesiodistal direction was taken.

收集115颗离体的上颌第一前磨牙，拍近远中向的X线片，用Photoshop5.0软件分析根管，用Weine氏法测量根管的弯曲度，测量的角度大于 18°时，则认为根管存在明显的弯曲，根管的构型采用Vertucci分类法。

METHODS: Sixty-nine extracted mandibular first premolars and 93 mandibular second premolars were used.Radiographs of teeth in mesiodistal direction were taken.

离体第一前磨牙69个，第二前磨牙93个，摄近中远中向的X线片，用Photoshop5.0软件分析根管，用Weine氏法测量根管的弯曲度，测量角度大于18度时，则认为根管存在明显的弯曲，根管的构型采用Vertucci分类法。

After they had enjoyed fair winds and weather for a season, they were en－countered many times with cross winds and met with many fierce storms with which the ship was shroudly shaken, and her upper works made very leaky; and one of the main beams in the midships was bowed and cracked, which put them in some fear that the ship could not be able to perform the voyage.

至于那根弯曲的主桅杆，因为船上的乘客们从荷兰带了一个巨大的铁螺钉，所以可以用它把那根桅杆复位，然后身兼木匠的船主保证他可以用一根固定在下层甲板上的柱子撑在它的下面，其他方向也绑好，这根桅杆就可以安全使用了。

Mycorrhiza is a mutualistic symbiosis between plants and fungi, and ectomycorrhiza is an important type of mycorrhiza.

菌根是一种植物营养根与土壤真菌形成的共生体，在自然界中分布广泛。外生菌根真菌是菌根真菌的重要类群，其宿主植物约占陆地植物总数的3%左右。

Arbuscular mycorrhizal symbiosis is the mutualistic association between AM fungi and most terrestrial plants: the plant roots offer carbohydrates to the fungi; in return, the fungi assist the plants with uptake of mineral nutrients, particularly phosphate, from soil, and their subsequent transfer to the root cortical cells.

南京农业大学资源与环境科学学院，南京 210095摘要丛枝菌根(arbuscular mycorrhizal， AM)共生是丛枝菌根真菌与大多数陆地植物的根系之间形成的一种互利共生关系。植物给菌根真菌提供碳水化合物；作为回报，菌根真菌能够增强植物对矿质营养元素的吸收。

The studies of mycorrhizal structures were helpful to understand the function mechanism of mycorrhiza. It could provide a theoretical base for further application of mycorrhiza.

对菌根共生体结构的研究有助于了解其与根功能的适应及深入探讨菌根的作用机理，为菌根菌的进一步应用提供理论基础。

The Heterotrophic bacteria, nitrosomonas, epiphyte and rhizosphere in non-rhizosphere zones are more than the contrast in the sample with the inoculants and enzyme, contrary to the nitrobacter and denitrifying bacteria.

菌剂和酶制剂的加入使得非根际泥样异养细菌、真菌、放线菌和亚硝酸细菌比对照组稍高，硝酸细菌和反硝化细菌则较少；而根际泥样中加菌剂和酶制剂组微生物数量比空白组高出1—2个数量级，在投加菌和酶制剂后酶活性无论在根际还是非根际都得到提高，高于对照组约5—6个酶活单位。

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。