2015医学博士听力原文(短文部分)

Passage 1

A team of Australian chemistry students have strengthened the chemical bonds of insulin to make it stable even at warm temperatures-a breakthrough that could simplify diabetes management. The finding could shed light on how insulin works, and eventually lead to insulin pills, rather than injections or pumps. Insulin needs to be kept cold because it is made of weak chemical bonds that degrade at temperature above 40 degrees Fahrenheit, making it inactive. But using a series of chemical reactions, the research team,comprised of students from Monash University inAustralia,replaced the unstable bonds with stronger,carbon-based ones.The stronger bonds stabilize the insulin’s two protein chains without interfering with its natural activity, according to a story about the findings at SciGuru.The so called “dicarba ” insulins were stable at room temperature for several years, SciGuru says. Even more promising is that the findings provide insight into how insulin works.

People with Type 1 and Type 2 diabetes do not produce enough insulin, whether it' s the result of an auto-immune disorder that stops producing it entirely (Type 1) or a condition brought on by other factors like obesity, in which the body can no longer use it properly (Type 2) . Insulin is the mechanism that delivers glucose from the blood to the cells，so diabetics must take a synthetic form of the hormone. When insulin unlocks cells to allow sugar to be taken up from the blood , the hormone ' s shape changes-but no one is sure what the shape looks like. If researchers knew that shape, they could design smaller, less-complex versions of insulin that don’t use proteins. Then it could be administered in pill form rather than directly into the bloodstream. Understanding the

molecule’s chemical bonds is a step toward unlocking that shape , the researchers say.

澳大利亚一组化学专业的学生加强了胰岛素的化学键，使其即使在温暖的温度下也能保持稳定——这是一项可能简化糖尿病管理的突破。这一发现可以解释胰岛素是如何工作的，并最终导致胰岛素药片的出现，而不是注射或泵。胰岛素需要保持低温，因为它是由脆弱的化学键组成的，当温度超过40华氏度时就会降解，使其失去活性。但是通过一系列的化学反应，由澳大利亚莫纳什大学的学生组成的研究小组用更强的碳基键取代了不稳定的键。根据SciGuru的一篇报道，更强的化学键可以稳定胰岛素的两个蛋白质链，而不会干扰其自然活动。SciGuru说，所谓的dicarba胰岛素在室温下稳定了好几年。更有希望的是，这些发现为深入了解胰岛素是如何工作的提供了思路。

1型和2型糖尿病患者不能产生足够的胰岛素,无论是“年代的结果,一种自身免疫性疾病,完全停止生产(1型)或一个条件带来的其他因素如肥胖,身体可以不再使用它正确(2型)。胰岛素是将葡萄糖从血液输送到细胞的机制，因此糖尿病患者必须服用一种合成的激素。当胰岛素释放细胞，允许从血液中吸收糖分时，激素的形状就会改变——但没人能确定形状是什么样的。如果研究人员知道这种形状，他们就可以设计出不使用蛋白质的更小、更简单的胰岛素。然后它可以以药丸的形式给药，而不是直接进入血液。研究人员说，了解分子的化学键是解开这种形状的第一步。

Passage 2

Brain wave scanners might make it possible to communicate with people who are considered brain-dead, according to a study reported in the Economist.

A couple of recent studies have shown that a small minority of vegetative patients might be more aware than they seem. Now, Damien Cruse, with the Medical Research Council’s Cognition and Brain Science Unit Cambridge, UK, thinks EEG machines will be