生物化学

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。

Description: This is the website for School of Biology and Biochemistry, Queen's University Belfast.

网站描述：这是贝尔法斯特女王大学生物学及生物化学学院的网站。

This is biological and biochemical codependence from our point of view.

以我们的观点，这是生物学与生物化学的相互依赖。

On earth, 90 percent of the methane in the atmosphere comes from the biochemical activity of life.

在地球上，大气层中90 %的甲烷来自于生命的生物化学活动。

College of Biochemical Engineering, Beijing Union University, Beijing 100023, China

北京联合大学生物化学工程学院，北京 100023

It is used in biochemical research and as a dietary supplement.

它被用于生物化学研究，也是一种饮食添加剂。

There may be genetic or biochemical factors in some cases.

有些可能是因为基因遗传或者是生物化学方面的原因。

This is the web page of Biochemical Systematics and Ecology.

这是《生物化学分类法和生态学》的网页。

Remember you will need at least 100 amino acids in the right order to do the most basic biochemical reactions.

记住您将需要至少100 氨基酸在正确的次序做最基本的生物化学的反应。

You most likely are not a biochemist or a physiologist and neither am I. But I have studied the subjects a bit.

你最有可能不是一个生物化学或生理学家和既不上午一但我研究的主题一点。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。