可取代的

Sequences of 28S rDNA across Acari, though with variable region, were not randomly distributed, with the expansion segments being more variable than the core regions and with an increasing sequence divergence with taxonomic distances.

散布图显示，转换取代与颠换取代有类似的线性变化；支序分析及群聚分析的亲缘关系显示，同科及同属内的成员都群聚的很好，全爪蟎属与小爪蟎属的亲缘关系近，与叶蟎属较近的是岩蟎属。28S rDNA的序列特性显示，其核心序列适合分析较高阶的蟎蜱亲缘，而展延区则可应用於低阶的分析。

The bearing part is like fish back instead customary shaft seat and can weigh different shaft load; Using fish back shaped arc surface for bearing load can overcome error brought by shaft bend and horizontal deviation.

承载部位呈鱼背状，取代原来的轴座，可进行各种轴负荷的称重；鱼背状承载弧面可克服轴受载弯曲或安装水平偏差引起的称重误差；改变弧径尺寸可适应不同轴径。

However, the spectral stability was increased, and the 0-1 transition and the full width at the half-maximum of photoluminescence spectra was decreased with the increase of the alkoxy length on phenylene. The nature (e.g. electron-donating and electron-withdrawing) of the substituted side groups on phenylene has obvious effect on the optical properties, QY and electrochemical properties of the polymers.

苯环上取代侧基的给吸电子性质变化对聚合物的光电性能具有全面的影响，改变取代侧基的给吸电子性质可调节芴苯共聚物的发光颜色和HOMO、LUMO能级以及HOMO-LUMO能隙等，因此，通过引入不同性质的侧基可以实现对此类聚合物光物理性能的调控。

It not only can prepare substituted arylamine sulfoacid with high-quality and high-yield, but also can easily control reaction temp., and reduce reaction temp..

所说的方法不仅能高质量、高产率地制备取代芳胺磺酸，而且由于在有机溶剂中进行反应，可非常容易地控制反应温度，并可降低反应温度。

The extraction equilibrium constants of Nd , Eu , Am in the system of seven monoacidic organophosphorus compounds dodecane 1. 0mol/l NO〓are reported. The dependency of the extractability on the PO〓function group、bonding charactor、metallic ion species and the structure of substitute has been examined.

给出了七个烷基磷酸的正十二烷熔液从1.0mol／lNO〓水溶液中萃取Nd、Eu、Am的平衡分配常数Kex，考察了萃取剂PO〓官能团、萃合物成键特性、金属离子及取代基结构与萃取性能间的关系，发现了：（1）可运用取代基自由能加和模型预测辛基膦酸辛基酯对La、Eu、Nd、Am等三价离子的平衡分配数据。

In the photoproducts with predominant quinoidal structure, abathochromic shift of absorption spectra is observed with increasing solvent polarity; inthose with predominant zwitterionic structure, a hypsochromic shift does so.

然而，所有这些取代基对光致变色反应的影响要较2〓位取代基的效应小得多。四。溶剂极性对光开环产物的吸收光谱和寿命的影响也被讨论了。这种影响效应的情况可概括如下： 1。

D2 hydantoinase (EC3151212) can change the D type racemates of the racemic D,L252 monosubstituted hydantoin to D2N2 carbamoylase, and the leftover L252 monosubstituted hydantoin due to never reacted with D2 hydantoinase, shown as figure 1, firstly racemizing, thus makes the D,L2 hydantoin completely changes to pure optical D2N2 carbamoylase, and then be changed to D2 amino acid.

海因酶具有底物特异性，D2海因酶(EC 3151212)可转化外消旋的D ，L252单取代海因中的D型消旋体成为D2N2氨甲酰氨基酸，剩余的L252单取代海因由于完全不被 D2海因酶所作用，如图 1所示，先进行消旋，从而使得 D ，L2海因完全转化为光学纯的 D2N2氨甲酰氨基酸，并进一步被转化为D2氨基酸。

The properties of the plating bath and the coating quality are investigated based on hull-trough test and electrochemical tests.The results show that the stability of electrolytic solution is increased,with addition of(NH_4)_3C_6H_5O_7 and the current efficiency ranges of the cathode are extended greatly to 0.11～1.54A/dm~2.Further,the current efficiency...

结果表明：柠檬酸铵的加入可提高镀液稳定性，增大阴极极化作用，可使阴极电流密度范围扩宽到0.11~1.54A/dm2，阴极电流效率高达95.6%，所得镀层细致、均匀、结合力好，为取代氰化镀铜提供了新思路。

It is an environment-friendly precision casting process, will be the shape of complex, high-precision castings, to reduce the weight of casting, which is the traditional method of unparalleled sand casting from the viewpoint of product quality can be completely replaced by sand casting resin.

它是一种环保型的精密铸造工艺，可获得形状结构复杂、高精度铸件，可减轻铸件重量，这是传统砂型铸造方法无可比拟的，从产品质量上看可完全取代树脂砂铸造。

A new convenient synthesis of a series of 1-aryl-2-propanones using aromatic amines as precursors, via diazo reaction and improved Meerwein arylation reaction under mild conditions, was achieved. In addition, 1-[3,5-bisphenyl]-2-propanone is a new compound among the synthesized compounds. This approach is an efficient synthetic method for the aryl-propanones with the different substituting groups.

以芳香胺为原料，经重氮化和改进的Meerwein芳基取代反应，合成了一系列的1-芳基－2-丙酮，其中1-（3，5-二三氟甲基苯基）2-丙酮是一个新化合物改进后的方法简化了合成步骤，提高了收率，可方便地用于在苯环上具有不同取代基的芳基丙酮的合成。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。