二倍的

Their antioxidant activities were investigated and compared with ascidian oil V by an oxidative stability instrument. The results show that components dihydrotanshinone and tanshinone Ⅰ have strong antioxidant activity at 0.01% addition.

以海鞘油脂为底物，用OSI仪测定了几种丹参酮类化合物的抗氧化活性，结果表明二氢丹参酮和丹参酮Ⅰ是很好的油脂抗氧化剂，添加量为0.01%时，就可使油脂的氧化稳定性提高3~4倍。

Organic solvent repetition crystallization method showed that 60% ethanol was the suitable solvent system. After 5 times repetition crystallization, the purity of product can be up to 98%, and the crystal state was yellow club-shaped, length of which is above 3mm. The productivity of this method is 30.01±1.26%, which is 2 times high than water repetition crystal method. So this method has good exploitation foreground.

有机溶剂重结晶法，选择60%浓度乙醇为适合的二氢杨梅素结晶体系，经过5 次重结晶后，产品的纯度可达98%，晶体为黄色、棒状，长度可达3mm，结晶产率为30.01±1.26%，较水重结晶法高2 倍左右。

The mechanism of co-fluorescence effect has been discussed. In chapter six, the new fluorescence enhancement phenomenon was observed by adding some crown ethers to samarium-thenoyltrifluoroacetone system.

在第六章中，研究发现当向钐-噻吩甲酰三氟丙酮中加入配位能力很强的大环配体冠醚时，冠醚对稀土有机配合物体系产生显著的荧光增强作用，其中冠醚二苯并18冠6后（DB18C6）可使钐-TTA二元配合物体系荧光强度增强280倍。

I m a g ine a star up t o twen ty time s lar g er, bri gh ter and hot ter th an our o wn sun.

设想一恒星大到二十倍较大，较亮和较热比我们的自己的太阳。

It means that it is impossible to realise efficient SHG conversion in this kind of multimode laser.

表明在无选模措施的这类内腔倍频激光器中不可能实现有效的二次非线性谐波转换。

Polymorphism of HLA-DQB1 promoter region in Hans IDDM patients and normal controls have been identified by PCR, PCR/SSCP and PCR/sequencing methods.No differences were found in y and s box between patients and controls carrying different allele as well as in different ethnic groups. There are two different sequences in x box,but CCTAGAGACAGATT sequence locates frequently on the haplotype with DQB1.0302 allele. Polymorphism between transcription point and y box (at position －44～-46 and －59～-61) might be associated with the genetic susceptibility to IDDM. Additionally,a new single base mutant (CACC→CAC A ) was found at position －131 and －128 in two patients carrying DQB1.0601 allele.

结果显示携带不同等位基因的患者与对照者DQB1 5'-调控区y、s box核苷酸序列相同，且与白种人基因结构一致；y box核苷酸序列存在二种结构，CCTAGAGACAGATT序列常常与DQB1.0302等位基因在同一单倍型；转录起始位点至y box间-44至-61位存在多态性，-59至-61位AAG等位基因可能与1-型糖尿病易感相关联；在2例携带DQB1.0601等位基因患者的-131至-128位间发现CACC→ACA A单个碱基取代突变。

The following three disadvantages of power spectrum reprocessing method for pitch detection are found: half pitch error and double pitch error with transition sound; easy distortion in noise speech; the complex method of judging voiceless and voiced speech.

本文分析了功率谱二次处理基音检测方法的不足：对于过渡语音，易产生半频或倍频误判；噪声干扰下，检测结果易失真；清、浊音的判断方法复杂。

At the onset of the war, he had emerged from obscurity with enough money to buy a small swift boat and now, when blockaded goods realized two thousand per cent on each cargo, he owned four boats.

当战争爆发时，他从默默无闻中突然冒了出来，用手头的钱买了一条小小的快艇，而现在，封锁线货物的利润已增加到二十倍，他也拥有四条船了。

The condition of having three copies of a given chromosome in each somatic cell rather than the normal number of two.

亚倍体的有一组染色体，只有几个染色体比正常的二色染色体少

Those inclined to think of the 20th century as the era of the common man can cite the inventor of one of the century's greatest machines as a case in point.

对于那些倾向于把二十世纪看作是一个庸辈倍出时代的人来说，有必要让他们知道这个世纪中有一个最为伟大的机器发明人。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。