查询词典 essential

Such loss could cripple your business so it's essential to have an effective back-up system in place.

这种损失可能会破坏您的业务因此，必须有一个有效的备份系统。

For this reason, back-up copies of documents are essential.

由于这些原因，备份文件是基本的。

The effect of QTL mapping was influenced by many factors including population structure and size, number of QTLs, density of genetic markers, heritability of traits etc., especially the genetic and statistic models, so it is essential to select appropriate method according to actual situations before mapping QTLs. In this study, backcross population for QTL mapping was constructed by computer simulation in order to study power of detection and mapping precision of QTLs at different levels of factors.

影响QTL 定位效果的因素很多，包括群体类型、规模、涉及的QTL 数目、遗传标记的密度、性状遗传力等等，特别是分析中使用的遗传和统计模型对QTL 检测和定位有较大的影响。

Essential academic background and experience for successful job performance.

具有能够胜任本职位工作的必要学历背景和经验。

Copper is one of the essential microelements for plants. But in recent years, the abuse of copper bactericide and industrial pollution has led to the increase of copper content in environment such as in soil.

铜是一种高等植物生长发育过程中必需的重要微量营养元素，是许多胞内酶所必需的组分或辅酶，它参与很多生理代谢过程，对作物的发育、品质、产量等有重要的影响。

To better understand the roles of LsrA protein in nodulation, a series of analyses of nodules using scanning electron microscopy, genetic and biochemical approaches have been carried out. Our analyses suggest that the lsrA1 nodules contain bacteroids in the invasion and establishing zone only. The lsrA gene expression is active early in the invasion zone and activated later than bacA genes. The lost of LsrA protein dramatically reduced the expression of nifA and fixK, and completely blocked the expression of the nifH gene for nitrogenase. LsrA protein functions early in the bacteroid development and it is essential for the development nitrogen fixing bacteroids.

前期的工作中，苜蓿中华根瘤菌Rm1021中90个候选LysR基因已经被定向插入突变，并筛选在自生生长时期、共生生长时期的表型，以期寻找更多在自生状态或共生固氮中有功能的LysR转录因子。1 针对前期鉴定出的共生固氮必需的lsrA基因，我们应用了一系列扫描电子显微镜技术、生物化学、分子遗传学等方法，发现lsrA基因主要在根瘤侵染区开始表达，表达时序也在侵染阶段左右，但晚于bacA基因表达；LsrA蛋白缺失后根瘤固氮区中缺乏具有固氮能力的类菌体，nifA和fixK基因的转录水平降低，nifH基因的转录被完全阻断，因此LsrA蛋白为根瘤发育所必需，是新的根瘤发育信号传导途径成员。2 通过表型筛选我们鉴定了苜蓿中华根瘤菌的oxyR基因，并研究了它的调节特性。oxyR突变后，苜蓿中华根瘤菌对过氧化氢敏感性提高，适应性降低。

A Cultural Baedeker for Chinese Tourists Abroad Global Travel Writing by Yu QiuyuWhen travelling becomes a " culture shock " and an essential part of globalisation .

中国海外游记文化指南--余秋雨的世界苦旅旅行成为一种"文化震荡"及全球化的一个重要组成部分。

Bailing out the auto industry, one of America's last major manufacturers,is essential to our economic recovery.

百灵了汽车业，美国的最后的主要制造商之一，是必不可少的经济复苏。

It is therefore essential to find a balance point between the rights of the intellectual property and the real product.

这就需要在知识产权人的利益和物权人的利益之间寻找一个平衡点。

The other is the miniature ball bearing, essential in the assembling of a missile-guidance system.

另一件是微型滚珠轴承，这是装配导弹的制导系统所必不可少的。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。