金属性

objective: to achieve the soluble expression of mn-sod gene in e.coli and assay the enzyme activity of the expressed product. methods: the coding region of superoxide dismutase was amplified using pcr method from the e.coli genome. the pcr product was cloned into puc19-t vector and sequenced.in addition,the cloned coding region of mn-sod was inserted into the expression vector pet-28a to form the recombinant plasmid pet-28a-mn-sod and was then transformed into e.coli bl21 for expression.

超氧化物歧化酶(superoxide dismutase，sod)是细胞体内歧化超氧阴离子自由基(o-2)的一个抗氧化酶，按其结合的金属性离子根据其中金属辅基的不同可分为4类：cu/zn-sod、mn-sod、fe-sod和ni-sod，它们通过催化超氧阴离子自由基0-2发生歧化反应，达到清除o-2的效果，具有防御氧毒性、增强机体抗辐射损伤能力、防衰老以及治疗某些肿瘤、炎症、自身免疫疾病等功效，广受国内外科研工作者的关注和重视[1]。

Any of several delicate Asiatic orchids grown especially for their velvety leaves with metallic white or gold veining.

亚洲产的精致兰花中的任何一种，栽培供观赏其带有金属性白色或金色叶脉的柔软的叶子。

It is found that with doping,thenumber of the iterant eg electrons decreases while the t2g electrons remain localized.

实验上发现随着掺杂，材料的磁性和金属性的出现几乎在同一区域，即x＞0.2左右。

Study on extraction and anti-oxidation of marasmius androsaceus mycelium polysaccharides

吸收电子能力越强的原子其非金属性也就越强；吸收电子能力越弱的原子其非金属性也就越弱，而其金属性就越强。

Our observations do not suggest that Li is unaffected by metallicity and/or age.

但是我们的观测不能锂一点也不受恒星金属性或年龄的的影响。

It is known that solar-type stars with high metallicity have a high probability of hosting planets.

因此，高金属性的类太阳恒星很有可能被行星绕转。

These two clusters offer a homogeneous sample of solar analogues in terms of age and metallicity.

这两个星团为我们提供了在年龄和金属性商同种性质的类太阳样本。

We now discuss the impact of age and metallicity on the Li abundance of solar analogue stars.

现在我们主要讨论的是：&类太阳&恒星中，与锂含量有关的恒星年龄和金属性效应问题。

This metallicity excess is also present in the solar analogue planet-bearing stars see Fig.

这些恒星的高金属性也可能加剧锂的衰减吗？

High concentration of doping (Li:B=1:2～Li:B=1:3) can improve the chemical activity and metallicity, but it can also reduce the stability of the clusters.

高浓度的掺杂(Li， B比为1：1或1：2)可以大幅度提高团簇的化学活性和金属性，但同时会降低其稳定性。

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。