为有高中科学学习背景的学生介绍实验室科学，与环境和人体化学的重要科学原则相关。
It is an introductory lab course for students with a high school science background, and relates important scientific principles to the chemistry of the environment and the body.
BBC新闻指出，人体会受到能产生“幸福感”的天然化学物质的影响。
The human body is influenced by natural chemicals that produce "a sense of happiness", noted BBC News.
为了使一种化学物质被认为是一种药物，它必须具有影响人体运作的能力。
In order for a chemical to be considered a drug, it must have the capacity to affect how the body works.
美国疾病控制与预防中心正在进行一项大规模研究，该研究发现，各年龄段的美国人体内都有148种化学物质。
A large, ongoing study conducted by the Centers for Disease Control and Prevention has found 148 chemicals in Americans of all ages.
这些复合物的化学结构相似，在治疗阿尔兹海默症方面很有前景。但人体不易吸收这些物质，而且用量很高时，它们会产生毒性。
These compounds, which are all similar in chemical structure, have promising characteristics, but the human body does not easily absorb them, and they can be toxic at very high doses.
我们周围的某些化学物质会影响人体的内分泌系统——其作用是通过调节激素分泌从而控制体重、生理周期以及生殖能力。
Some of the chemicals that are all around us have the ability to interfere with our endocrine systems, which regulate the hormones that control our weight, our biorhythms and our reproduction.
科学家们发现人体自然产生的一种对抗关节炎的化学产物在大脑环境中也可起作用使得阿尔茨海默氏症引起的记忆力丧失有望恢复。
Memory loss caused by Alzheimer's Disease could be reversed after scientists discovered that a chemical naturally produced by the body to fight arthritis also works on the brain condition.
李刚说，人们应了解，所有的化学添加剂都可能对人体造成潜在危险，关键取决于其用量大小。
People should keep in mind that all chemical additives may pose potential dangers to human health, depending on the amounts used, Li said.
研究对象的香烟中添加了一种多环芳烃化合物，该物质进入人体后被转化为另一种破坏dna的致癌化学物质。
A PAH was added to the subject's cigarettes, which was then modified by the body and turned into another chemical which damages DNA and has been linked with cancer.
由于酸会破坏人体所需的化学反应，激素转化脂肪成为能量的反应无法正常进行，这样无论如何健康的饮食都无法阻止你继续肥胖了。
Because acidity disrupts the body's chemistry, the hormones needed to convert fat into fuel also fail to function properly, so the obesity persists no matter how healthy your diet becomes.
同时土豆也含有其他蔬菜所含有的对人体有益的化学物质，如维他命和矿物质等。
Like other vegetables, potatoes contain phytochemicals, along with other vitamins and minerals that are beneficial to the body.
代谢组学研究代谢物，即人体细胞内持续进行的成千上万化学反应的副产品。
Metabolomics studies metabolites, the by-products of the hundreds of thousands of chemical reactions that continuously go on in every cell of the human body.
为什么细小的有毒化学微粒会影响人体对葡萄糖的处理能力？
Why would tiny particles of toxic chemicals affect our ability to process glucose?
这些化学物质中的一些对人类极其危险，因为它们酷似人体天然所需的物质(如碘)，并极易进入人体的组织。
Some of these chemicals are especially dangerous to humans because they mimic substances the body naturally USES, such as iodine, and are readily incorporated into the body's tissues.
到目前为止，有六名儿童死于三聚氰胺奶粉——人体摄入工业用化学物三聚氰胺会对肾脏造成伤害，另外还有近三十万儿童因食用这种奶粉而致病。
So far six children have died and nearly 300, 000 were sickened from drinking powdered milk that contained melamine, an industrial chemical that can cause kidney problems when consumed.
最近有三名国会议员就破裂法发表报告，报告指出，2005—2009年间石油和天然气公司使用的2500多种破裂材料含有750种化学物，有些成分是对人体无害，如柠檬酸、速溶咖啡。
Three members of Congress recently released a report on fracking, saying that oil and gas companies used more than 2,500 fracking products containing 750 chemicals between 2005 and 2009.
松弛的皮肤香烟中含有4000多种化学成分，其中大部分物质都会伤害人体的骨胶原和弹。
Sagging Skin There are more than 4,000 chemicals in tobacco smoke, and many.
香烟中含有4000多种化学成分，其中大部分物质都会伤害人体的骨胶原和弹。
There are more than 4,000 chemicals in tobacco smoke, and many.
正如《柳叶刀》和联合国儿童基金会都表明的，处理饥饿并不需要人体生化学方面的博士学位。
As the Lancet and Unicef both make clear, dealing with hunger hardly requires a doctorate in the biochemistry of the human body.
如果一种疾病与数以百计的罕见变异有关，则可能意味着太多人体的生物化学物质是有用的。
If hundreds of rare variants are involved in a disease, they may implicate too much of the body's biochemistry to be useful.
但是这种中药混合物含有许多化学物质，它们之间以及与人体之间有许多相互作用。
But these mixtures contain many chemicals that govern a myriad of interactions with each other and the body.
当水被搅动时，就会将这些化学物质释放到空气中然后被人体吸入。
As the water is agitated, these chemicals are released into the air and then breathed in.
扰乱这一化学系统会带来可怕的后果。脑研究者发现在一些罕见的例子中，影响这些化学物质的基因突变会导致人体肥胖。
Disturbing this chemical system can have dire effects - brain researchers have found that in rare instances, gene mutations that affect these very chemicals can cause obesity in people.
该研究最初做了人体实验，以追踪烟草中的物质如何导致DNA损害，并在由美国化学学会出版的行业杂志《化学毒理学研究》中发表。
The study is the first on humans to track how substances in tobacco cause DNA damage, and appears in the peer-reviewed journal Chemical Research in Toxicology, issued by the American Chemical Society.
这项研究呼应了之前的发现，化学物质会伤及人体的神经系统，影响到控制体重的系统。
The research echoes previous studies which have shown that the chemicals can cause damage to the system that naturally controls one's body weight.
这项研究呼应了之前的发现，化学物质会伤及人体的神经系统，影响到控制体重的系统。
The research echoes previous studies which have shown that the chemicals can cause damage to the system that naturally controls one's body weight.
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