查询词典 nitrogen

Conclusion］ The ammonifiers in nitrogen utilizing bacteria in Danhe water was in much distribution,the nitrobacteria,nitrosation and denitrifying bacteria were at next and azotobacter was relatively less.

结论］ 丹河水体中的氮利用菌中氨化细菌分布较多，硝化细菌、亚硝化细菌和反硝化细菌次之，固氮菌则相对较少。

In order to select high nitrogen-fixing azotobacter strains, nitrogenase activity of 13 strains separated in the rhizosphere in Gansu non-leguminous crop fields were measured by acetylene reduction method. Also the fertilization effect of the strains on spring wheat was investigated via pot experiment.

为挑选具有高固氮能力的自生固氮菌菌株，用乙炔还原法对甘肃省春小麦和玉米等非豆科作物根际土壤中分离所得的13株菌进行固氮酶活性测定，并通过盆栽试验对其进行春小麦肥效试验。

Sinorhizobium meliloti can fix nitrogen at the symbiotic phase, as it differentiates into bacteroid in the

还与结瘤有关，即它的调节功能具有多效性。但S。 meli loti 中究竟有多少基因的表达与nifA 相关

To better understand the roles of LsrA protein in nodulation, a series of analyses of nodules using scanning electron microscopy, genetic and biochemical approaches have been carried out. Our analyses suggest that the lsrA1 nodules contain bacteroids in the invasion and establishing zone only. The lsrA gene expression is active early in the invasion zone and activated later than bacA genes. The lost of LsrA protein dramatically reduced the expression of nifA and fixK, and completely blocked the expression of the nifH gene for nitrogenase. LsrA protein functions early in the bacteroid development and it is essential for the development nitrogen fixing bacteroids.

前期的工作中，苜蓿中华根瘤菌Rm1021中90个候选LysR基因已经被定向插入突变，并筛选在自生生长时期、共生生长时期的表型，以期寻找更多在自生状态或共生固氮中有功能的LysR转录因子。1 针对前期鉴定出的共生固氮必需的lsrA基因，我们应用了一系列扫描电子显微镜技术、生物化学、分子遗传学等方法，发现lsrA基因主要在根瘤侵染区开始表达，表达时序也在侵染阶段左右，但晚于bacA基因表达；LsrA蛋白缺失后根瘤固氮区中缺乏具有固氮能力的类菌体，nifA和fixK基因的转录水平降低，nifH基因的转录被完全阻断，因此LsrA蛋白为根瘤发育所必需，是新的根瘤发育信号传导途径成员。2 通过表型筛选我们鉴定了苜蓿中华根瘤菌的oxyR基因，并研究了它的调节特性。oxyR突变后，苜蓿中华根瘤菌对过氧化氢敏感性提高，适应性降低。

The effect of Zn and Mo nutrient on yields, quality and nitrogen, active oxygen metabolism in leaves of balsam pear was discussed.

文后讨论了锌钼营养对苦瓜产量品质和叶片氮、活性氧代谢的影响机理。

The effect of Zn and B nutrient on carbon and nitrogen metabolism, polyamines, hormone and senescence in leaves of balsam pear was discussed.

文后讨论了锌硼营养对苦瓜碳氮代谢；多胺、内源激素代谢以及叶片老化的影响机理。

The results show that in order to obtain optimal propagation results, the optimal pH is 7.0, the temperature is 28℃, the carbon source in culture medium is corn, the nitrogen source culture medium is barm.

结果表明：pH值7.0，温度28℃最适合HDF01的生长。培养基中以玉米粉为碳源，酵母粉为氮源，加入微量元素Mn及雄生素B6，HDF01的产孢量最高。

There is plenty of nitrogen in the air but it cannot be absorbed directly by the plants .

空气中有大量的氮，但植物不能直接吸收。

There is plenty of nitrogen in the air but is cannot be absorbed directly by the plants.

空气中有大量的氮，但植物不能直接吸收。

The re is plenty of nitrogen in the air but it cannot be absorbed directly by the plants.

空气中有大量的氮，但植物不能直接吸收。

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。