1·They alter the way it cleaves amyloid precursor protein.
它们改变了这个酶切割淀粉样蛋白前体的方式。
2·This is a precursor to heparin, an important anti-clotting agent that has, at present, to be extracted from blood, rather than being synthesised. Heparan sulphate is not a protein.
硫酸乙酰肝素是肝磷脂的前体，是重要的抗凝剂，目前只能从血液中提取，从未成功合成提取过，它并不是蛋白质，而是一种富硫似糖的分子，经常参与糖基化反应。
3·Amyloid plaques form when a molecule called amyloid precursor protein (APP) is chopped up by two enzymes known as beta-secretase and gamma-secretase.
当一种叫淀粉样前体蛋白（APP）的分子被两种酶——分别叫作贝塔-分泌酶和伽玛-分泌酶——切断时就形成了淀粉样斑块。
4·Edwin Wintermute and his colleagues at Harvard have engineered yeast cells to carry out two of six steps in the pathway needed to make lysergic acid, the precursor of LSD.
埃德温·温特·姆特(Edwin Wintermute)和他在哈佛的同事已经通过基因工程改造了酵母细胞，在产生麦角酸——LSD的前体——的六步反应路径中已经实现了其中的两步。
5·The researchers basically amplified and then short-circuited E. coli's internal machinery for producing large fatty-acid molecules, enabling them to convert precursor molecules directly into fuels.
研究者从根本上放大并缩短了大肠杆菌产生大分子脂肪酸的内部机制，是的他们能够直接将前体分子转化为燃料及其他化学品。
1·He said that the deal should not be seen as a precursor to a merger.
他说这次交易不应该被看作是合并的前兆。
—— 《柯林斯英汉双解大词典》
2·Impatience is often a precursor to self-punishment, so stop way before the red light hits.
焦躁通常是自我惩罚的前兆，因此，你得赶快在红灯亮起之前停下来。
3·The current huge gaps, in income levels, opportunities, and health outcomes, are a precursor for social breakdown.
目前的收入水平、机会和健康结果的巨大差距是社会崩溃瓦解的一个前兆。
4·The meeting was a precursor to the larger G-20 meeting taking place in Seoul on November 11 and 12.
这次会议将是于今年的月的11日至12日在汉城召开的较大的20国集团会议的前兆。
5·The stabilisation of prices turned out to be a precursor to broader economic recovery.
因此，此时住房价格的重新趋稳被视为整体经济恢复的一个前兆。
1·The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.
结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。
2·The interference of the precursor and the slightly delayed main waveform can explain this structure.
前驱的干扰和主波形轻微的延迟可以解释这个结构。
3·Previous experiments based on macroscopic electromagnetic wave propagation (involving lots of photons) have shown that the optical precursor is the fastest part in the propagation of an optical pulse.
先前基于宏观电磁波(包含大量光子)的实验已经证明，光前驱是光脉冲在传播过程中最快的部分。
4·As the optical precursor and main wave packet traveled through a second group of rubidium atoms, the scientists took measurements on the speed of the two photon components.
随着光前驱和主波包通过第二组铷原子，科学家就可以对这两个光子成分的速度进行测量。
5·It mixes small precursor particles of the different materials to create a "nanoparticle ink" that is continuously coated onto metal foil and then heated so that the particles assemble correctly.
它的生产过程是将不同元素的前驱粒子混在一起制成“纳米微粒墨”，将其连续不断地涂在金属薄片表面，然后通过加热处理使粒子适当地组合。
1·The models may be developed as a precursor to implementing the physical system, or they may be derived from an existing system or a system in development as an aid to understanding its behavior.
模型也可以作为实现物理系统的先驱被开发，或者模型可以根据一个已存在的系统或者开发中的系统被产生作为理解系统行为的帮助手段。
2·Corporations have had the precursor of social networks for ages.
很长时间以来，企业都是社会化网络应用的先驱。
3·Requirements management is a precursor to the bulk of the testing effort, providing a significant amount of test motivation and validation needs.
需求管理是大多数测试工作的先驱，提供了大量的测试动机和确认需求。
4·His latest idea is that the gap was bridged by music, which may thus be seen as a precursor to language.
他最近提出，其间的沟壑由音乐填补——而音乐也可以看视为语言的先驱。
5·The giant German automaker marked the anniversary of the riding car by calling it “the most important precursor to individual mobility.”
这个德国汽车巨头在纪念骑式双轮车的周年庆上把它称作“个体流动最重要的先驱”。
1·Error is often the precursor of what is correct.
错误常常是正确的先导。
—— 《新英汉大辞典》
2·He persisted in his strategy of disabling Russia's ally as a necessary precursor to the final showdown with Peter, which he was still confident of winning.
他仍然坚持自己以打败俄国的盟友作为最终打倒彼得的必要先导的策略，此时他仍然对最终的胜利抱有信心。
3·The corrosiveness of commodity fetishism, the breakout of collective life, and the loss of the cultural critic and spiritual precursor, all of these become new crisis of postmodernism.
商品拜物教的腐蚀性，集体生产方式被打破，文化的批判功能和精神先导作用的丧失等内容成为后现代文化面临的新的危机。
4·You know, the error is often the precursor of what is correct.
要知道，错误常常是正确的先导。
5·The Section-map, Column-map is the key and precursor chart during the all geology work and was draw by geologist frequently.
地质剖面图和柱状图是整个地质工作成果的基础和先导图件，是地质工程师经常性绘制的图件。
1·And so, you make not only water vapor, nox but you make some nitrous oxides, nox, or nox as it is known, and this is the precursor to smog.
这样不仅仅得到的水蒸气，但是你会得到一些氮氧化物，或者如大家所知到的nox，这是烟雾的前驱体。
2·The results show that the synthesized precursor is an organosilicon compound and its dried and roasted product is cordierite.
结果表明，合成的前驱体为一种有机硅化合物，其干燥、煅烧后的产物为堇青石。
3·Experimental results indicate that a high reaction temperature and quickly ascending temperature speed apparently increase the nucleation number of monoclinic zirconia in the precursor solution.
实验结果表明，高的反应温度和煅烧过程中快的升温速度明显增加了前驱体溶液中单斜氧化锆的形核数。
4·Research advances of application of its commonly used methods, such as direct reaction method, precursor method, surfactant method, and ligand method in recent years, were introduced.
介绍了近年来低热固相化学反应中常用的直接反应法、前驱体法、添加表面活性剂法、配体法应用的研究进展。
5·The activity of precursor powder at different calcination temperatures and the influence of kaolin and starch additional on the effective sulfur capacity of shaped desulfurizer were investigated.
考察了不同煅烧温度下前驱体粉末的活性、不同高岭土添加量以及不同淀粉添加量对成型脱硫剂有效硫容的影响。
1·Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.
色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。
2·Yen crosses remained inflated with solid showings in equities as well as a general euphoria over the excellent US data which may be a precursor of Fridays' NFP data.
在股市稳健走高，以及优异的美国数据引发普遍乐观情绪这两个因素作用下，日元交叉盘依然上涨。美国良好经济数据或是周五非农就业报告的前导。
1·Oxidation method and neutralization titration are two common ways of hydrothermal prepared ferrite precursor.
氧化法和中和法是水热制备铁氧体前驱物的两种常见方法。
2·The choice of precursor, avoiding impurity phases and the condition of selenization are the key factors of low cost processing.
前驱物的选择，杂相的去除，以及后处理条件是影响非真空工艺的关键因素。
3·Studies on the pyrolysis carbon from different organic precursor indicate: the more compact structure and the smaller specific surface area of pyrolysis carbon, the more stable the composite.
对不同有机前驱物所得热解炭的研究表明：热解炭的比表面积越小、结构越紧密，其复合材料的循环稳定性越好。
4·However, the electrospinning precursor jets undergo intense instability due to its polyelectrolyte nature.
但是，由于前驱物的聚电解质性质，电纺射流会经历更强烈的不稳定性。