VOA标准英语2011--Nanostructure Promotes Blood Vessel Grow
时间：2019-01-14 作者：英语课 分类：VOA标准英语2011年(八月)
Nanostructure Promotes Blood Vessel 1 Growth
U.S. researchers have developed a new way to promote the growth of blood vessels 2 which potentially could improve treatment in diabetes 3, organ transplants, stroke, and heart attack.
The veins 4 and arteries 5 that snake through the body are something like a highway network, a pathway to transport oxygen and other nutrients 6 to cells.
When blood vessels get blocked, the tissue being supplied can die. That's what happens in a heart attack, for example: a blocked artery 7 leads to death of heart muscle cells.
Scientists have been trying to harness the body's own mechanism 8 for growing blood vessels, but researcher Samuel Stupp of Northwestern University in Chicago explains they want to improve on nature.
"So we want to imitate what the body naturally does, but we want to be able to do it on demand, exactly in the place where it's needed in, and we want the blood vessels to grow rapidly."
The body naturally tells, or signals cells to start growing new blood vessels with a protein called VEGF (vascular endothelial growth factor), but studies have found that treating patients with VEGF is very expensive, the effect doesn't last long, and the blood vessels grow slowly.
So Stupp and his colleagues designed a tiny molecular 9 structure covered with peptides that mimic 10 the signaling function of the body's own VEGF.
"So they can be injected in tissue, and they can then signal cells directly and have a therapeutic 11 effect," referring to the growth of new blood vessels.
Stupp and team used laboratory mice to test the concept. The researchers cut out a piece of artery from the animals' legs to simulate the loss of circulation often faced by people with diabetes. "And we observed that circulation was restored within three to four weeks," Stupp says.
Human trials are still in the future, but Stupp says in theory this new treatment would help in a number of medical scenarios 12, such as a heart attack - when a blood clot 13 cuts off the heart's own blood supply.
"So if you had a therapy that you could introduce into the heart muscle, you could jump-start the growth of blood vessels and possibly save more of the heart muscle that has been affected 14 by the heart attack."
- The vessel is fully loaded with cargo for Shanghai.这艘船满载货物驶往上海。
- You should put the water into a vessel.你应该把水装入容器中。
- The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
- All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
- In case of diabetes, physicians advise against the use of sugar.对于糖尿病患者，医生告诫他们不要吃糖。
- Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的。
- The blood flows from the capillaries back into the veins. 血从毛细血管流回静脉。 来自《简明英汉词典》
- I felt a pleasant glow in all my veins from the wine. 喝过酒后我浑身的血都热烘烘的，感到很舒服。 来自《简明英汉词典》
- Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
- This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》
- a lack of essential nutrients 基本营养的缺乏
- Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
- We couldn't feel the changes in the blood pressure within the artery.我们无法感觉到动脉血管内血压的变化。
- The aorta is the largest artery in the body.主动脉是人体中的最大动脉。
- The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
- The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
- The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
- For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时，分子的碰撞就停止了。
- A parrot can mimic a person's voice.鹦鹉能学人的声音。
- He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。
- Therapeutic measures were selected to fit the patient.选择治疗措施以适应病人的需要。
- When I was sad,music had a therapeutic effect.我悲伤的时候，音乐有治疗效力。
- Further, graphite cores may be safer than non-graphite cores under some accident scenarios. 再者，根据一些事故解说，石墨堆芯可比非石墨堆芯更安全一些。 来自英汉非文学 - 环境法 - 环境法
- Again, scenarios should make it clear which modes are acceptable to users in various contexts. 同样，我们可以运用场景剧本来搞清楚在不同情境下哪些模式可被用户接受。 来自About Face 3交互设计精髓
- Platelets are one of the components required to make blood clot.血小板是血液凝固的必须成分之一。
- The patient's blood refused to clot.病人的血液无法凝结。