| 1. | But an unexpected fact was noted : certain minerals ( pitchblende , chalcolite , autunite ) had a greater activity than might be expected on the basis of their uranium or thorium content
但是一个意外的事实引起了我的注意：某些矿物质(沥青铀矿物质、铜铀云母或钙铀云母)的活性比根据其铀或针含量所判断的要高。 |
| 2. | The decrease of active surface area in the anode caused by co2 accumulation is reduced through treating the diffusion layer and catalyst layer with ptfe , resulting in increased dmfc performance
通过对阳极扩散层和催化剂层的疏水处理，降低了阳极产生的co2导致的催化活性比表面积损失，有效地提高了电池性能。 |
| 3. | The investigation reveals that the performance of a mea is mainly controlled by the conductivity of membrane , load of catalyst and co2 holding in the anode , ion conductivity and specific of active area in both anode and cathode
研究表明，膜电极性能主要受质子交换膜的电导率、阳极催化剂用量、阳极co2气体和阴极水的传递、催化剂层的活性比表面积和质子电导率等因素控制。 |
| 4. | The extracts of rhizoma coptidis , cortex phellodendri and radix scutellariae exhibit the best antimicrobial activity ; whereas the antimicrobial activity of the 70 % aqueous methanol extracts is better than by the water extracts
实验结果表明这十味中草药提取液对六种供试菌有不同程度的抗菌效果，其抗细菌活性比抗真菌活性强，其中黄连、黄柏和黄芩提取液的总抗菌活性最强；结果还表明70 %乙醇水溶液比水提取药液的抗菌活性要强。 |
| 5. | Putative transgenic plants were screened b y nptii - specific and mnsod - specific pcr amplification and southern blotting , 84 % of the transgenic plants gave positive results . the results of mnsod activities demonstrated that tobacco mnsod gene contributed to more than 50 % of the total mnsod activity in some transgenic alfalfa
Npt基因和mnsod基因的pcr检测和southern杂交表明mnsod基因已经整合到84的保定苜蓿转基因植株的基因组中， mnsod活性测定结果表明转基因植株中的mnsod活性与对照植株之间存在显著差异，部分转基因植株的mnsod活性比对照植株提高了1倍以上。 |
| 6. | It was found that in the simulated physiological solution , the hydrogen bindings between some amido groups in the mp - 11 molecules are decomposed and the mp - 11 dimers become monomers . it induces the increase in the contents of the a - helical and ( 3 - turn conformation , the decrease in the content of the random coil conformation of mp - 11 as well as the increase in the exposure extent of the heme group . therefore , the reversibility of the electrochemical reaction and the electrocatalytic activity of mp - 11 for h2o2 reduction increase comparing the situation in the aqueous solution
发现在模拟生理条件下， mp - 11分子的多肽链上一些酰氨基的氢键发生了解离，使部分双聚的mp - 11分子变成单体分子， mp - 11分子二级结构中-螺旋和-转角结构的含量增加，无规卷曲结构含量降低，导致了mp - 11分子中血红素的暴露程度变大，因此mp - 11电化学反应的可逆性和对h _ 2o _ 2还原的电催化活性比在水溶液中有所增加。 |
| 7. | The initial activity of pt / tio2 was higher than that of tio2 because it restrained the recombination of electron and hole with supported pt , however the regenerated ability of the pt / tio2 was lower than that of tio2 . after the regeneration , the activity could come back to some 60 % of the original activity and the reaction activity declined rapidly . the reason might be that after regeneration on the surface of pt / tio2 the incomplete oxidation of h2s to produce s was enhanced
Pt tio _ 2催化剂的初活性比单一的tio _ 2催化剂的初活性高，这是因为担载的贵金属抑制了电子与空穴的复合，但其再生性能比tio _ 2差，再生后活性只能恢复到初活性的约60 ，且反应活性迅速降低，这可能由于在再生后的pt tio _ 2表面上， h _ 2s通过不完全氧化生成s ~ 0的反应增强所致。 |
| 8. | The positive transformants with the integrates mn - sod gene was identified by zeocin - resistance , pcr screening and expression in p . pastoris . the recombinant mn - sod protein was successfully expressed in pichia pastoris based on the evidences that a relative molecular weight about 23kd appeard in sds - page , the obvious activity of sod existed in native - page and enzymatic activity test , and mn - sod activity was specific base on the inhibition with the mixture of chloroform - enthanol ( 3 : 5 / v : v ) and potassium cyanide . two secreted plasmids ppiczaa - sodm18 and ppiczaa - sodc were constructed and after there linearization were transferred into chromosome of pichia pastoris gs115 by electroporation
Pcr鉴定及mut表型分析进一步说明，目标基因已经重组到宿主菌基因组染色体上； 0 . 5甲醇诱导表达后， sds - page结果显示，表达的蛋白相对分子量约为23kd ，活性电泳出现明显活性条带；酶活性测定显示，重组菌株sod活性比对照提高5倍左右；氯仿-乙醇( 3 : 5 v : v )和kcn ( 5mmol l )抑制反应进一步证明，所表达的sod为锰超氧化物歧化酶。 |
| 9. | When the bacterial strain of s . maltophilia 276 was cultured in the three media of lb , pda and kmb , and the sod activities of cell extracts were detected , it was found that s . maltophilia 276 could produce higher activity of sod when cultured in lb media than that in the other two media
利用lb 、 pda和kmb三种液体培养基培养s maltophilia276菌株，检测其细胞提取物中sod的活性，结果发现在lb培养基上培养的276菌株中的sod活性比在利用pda或kmb培养基培养的276中的sod活性要高。通过对不同培养时间的细菌含量和sod的活性检测发现：在s |
