二价

Nicotianamine synthase gene has an important function in the Fe-deficiency response of graminaceous monocots, and it catalyzes substance to nicotianamine which plays an important carrier in the internal transport of Fe(superscript 2+) and other divalent metal ions. Nicotianamine can bind with Fe(superscript 2+) to form Fe(superscript 2+)-NA complex and protect plants from toxicity in acidic soil.

烟酰胺合成酶基因在单子叶禾本科的缺铁胁迫应答反应中起着关键作用，它的催化产物烟酰胺是铁及其他二价金属离子在体内吸收和转运的重要载体，且能与Fe(上标 2+)结合形成Fe(上标 2+)-NA复合物，从而使植物在酸性土壤中免受铁毒害。

Complexes 4 and 7 were additionally characterized by a single-crystal X-ray diffraction study. These results further certify the heteroatom coordination promoted homolytic reaction of the Ln-N bond.

通过上述实验结果进一步证实了经过杂环氧原子的配位，能促使Ln-N键均裂，得到Ln化合物，进一步拓展了这种合成二价镧系有机化合物的新方法。

It was also found that the chromosomes paired well and formed a rod heteromorphic bivalent in the hybrid F1[73(36)9-1×CSDT 1BL]. Whereas 73(36)9-1 produced mainly configuration of 20''+1'+t' when test-crossed with CSDT 1BS. It showed that the translocation occurred on chromosome 1B short arm, and this segment came from rye chromosome 1RL. In the present paper we discussed also the way in which the translocation might be caused, and concluded that it was formed through reunion of two kind telocentrica (1BL and 1RL) after simultaneous misdivision of two univalent chromosomes (a wheat chromosome 1B, and a rye 1R).

同时还发现，73（36）9-1和"中国春"双端体的1BL能很好地配对并形成一个棒状的异形二价体，而它和CSDT 1BS的染色体则主要产生20+1′+t′的构型，从而证明易位发生的可能途径，推断是由于在F1花粉母细胞中的两个单价体（一个是小麦染色体1B，一个是黑麦染色体1R）同时进行错分裂之后产生的两种端着丝点染色体（1BL和1RL）重新并合形成的，因而冬小麦73（36）9-1可能是一个自发产生的易位系。

Time course of expression of hydrogenase activity showed that the derepression of hydrogenase activity depended on nickel.

除镍外其他二价金属离子如钼、铜、锌、钴、铁、镁、锰、钙等未发现对吸氢活性有促进作用。

Chemical oxidations of sodium plumbite solution in alkali are readily achieved with chlorine, bromine, and hydrogen peroxide and simple lead salts may be oxidized with 37 M nitric acid.

用氯、溴和过氧化氢在碱性条件下可实现化学氧化铅酸钠。简单的二价铅的盐可用37M的硝酸溶液来氧化

The δ13 is-1.63‰~2.31‰ and averages 0.25‰δ18O is-11.49‰~6.02% and averages-8.72‰. The content of Sr is low, 77×10^(-6)~107×10^(-6), the content of Fe and Mn are high. The degree of order is high and the molar volume of CaCO3 is low.

13C值为-1.63‰~2.31‰，平均为0.25‰，δ18O值为-11.49‰~-6.02‰，平均为-8.72‰；锶含量较低，在77×10^(-6)~l07×10^(-6)之间，二价铁、锰含量较高，具有高的有序度和低的CaCO3摩尔含量的特点。

The two valence vaccine consisting of catalase, adhesion conservation and adjuvant has better immunotherapeutic effects than the single valence vaccine. More H. pylori vaccine research should be directed to the multivalence vaccine.权威期刊K-Rf l4tw

由过氧化氢酶和黏附素保守区加免疫佐剂组成的二价口服疫苗较单价口服疫苗有更好的免疫治疗效果，多价疫苗是未来H.pylori疫苗的研制方向。

AgCl , Agl and CuO organosol were obtained by using oleic acid to extract and modify the nanoparticles in hydrosols. The effect factors on organosol were discussed extensively.AgCl organsol,AgCl and CuO organosol were mixed with MMA.

用油酸萃取并包覆了水溶胶中的氯化银、碘化银和氧化铜纳米粒子，制备了氯化银、碘化银、氧化铜及氯化银与二价铜共存有机溶胶，并对制备有机溶胶的条件进行了系统的研究。

We have developed a technique of random-primed tritium labeled DNA extension on the pachytene bivalents of rice-field eels.

采用随机引物，在黄鳝二价体上建立了氚标记引物原位DNA合成技术，并详细探索了该技术的实验条件。

The adsorption properties of the function fiber in solution for transition metal ion such as Zn2+,Cd2+,Hg2+etc., were studied and the effects of temperature, concentration, pHon adsorption were also determined. The results showed that the fiber exhibited fairly good adsorption properties, and the adsorption capacities for Zn2+.Cd2+,Hg2+ were up to 196.79mg/g, 275.40mg/g and 6,84.01mg/g respectively.

又研究了该纤维材料在水溶液中对Zn2+、Cd2+、Hg2+等过渡金属离子的吸附性能，测定了温度、起始浓度、PH对吸附性能的影响，结果表明该功能纤维对部分过渡金属二价离子有良好的吸附，对zn2+、Cd2+、Hg2+的吸附量分别为196.79mmg／g、275.40rmmg／g、684.01mmg／g。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。