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Stem Cell Therapy May Help Repair the Heart According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure. Researchers at Pittsburgh University School of Medicine examined 20 patients who had severe heart failure and were going to have surgery. They injected stem cells into the parts of their hearts that were damaged. They then compared their hearts with those of people who had undergone surgery without having the stem cells injected into them (they had also suffered from severe heart failure). The patients who had the stem cells injected had hearts that were able to pump (用泵抽运) more blood than the others. According to Professor Robert Kormos, one of the researchers, these results could revolutionize heart treatment. Although previous studies had indicated that there might be a benefit, this is the first study that has actually proved that stem cell therapy can help the failing heart work better. All the patients in this study had hearts that could not pump blood properly. The scientists measured their ejection fraction (射血分数). It is a measure of heart performance; you measure how much blood is being pumped out by the left ventricle (心室). Healthy people’s ejection fraction is about 55%. These patients had ejection fraction of under 35%. They all had by-pass surgery (搭桥手术) performed on them. Some of the patients had stem cells taken from their hip bones and injected into 25～30 sites in the damaged heart muscle. Six months later their ejection fraction rate was 46.1% while those who just had surgery but no stem cell injections averaged 37.2%. Heart failure is a common problem all over the world. In the UK alone about 650,000 people suffer from heart failure every year. As the number of people suffering from heart failure increases in the world in general these findings are particularly significant. Current treatments relieve the symptoms. This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease. The ejection fraction rate of the patients with stem cell injections decreased.
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第二篇 Health or Profit Although there is no direct evidence that salt is the cause of high blood pressure ar "hypertension", there are studies which indicate that reducing salt intake lowers blood pressure. Some scientists are also concerned that excessive use of salt may cause asthma and kidney disease. Therefore most doctors would welcome a decision by food manufacturers to decrease the amount of salt in food. Many food manufacturers, however, are reluctant to reduce tile amount of salt. Salt is an important flavor enhancer and preservative. British Salt points out that salt is an essential nutrient and regular intake is required to maintain bodily functions. Moreover, according to British Salt, there are greater risk factors in hypertension, such as obesity (肥胖), lack of exercise, alcohol intake and smoking. Another reason why food producers are not keen on lowering the amount of salt is probably that they fear that less salt will mean lower sales. Not only will the sale of processed food containing salt decease but also the sale of soft drinks. A recent study, published in The Lancet of April 1999, proves that if manufacturers cut the salt content of food it will not necessarily affect the taste of the product. Anthony Rodgers and Bruce Neal conducted a study to examine the difference in taste between bread with standard and reduced salt content. Three types of whole-meal bread were prepared, identical in all respects except for salt content. One loaf contained the standard quantity, one loaf 10% reduced and one 20% reduced. Sixty participants, who did not know the salt content were asked to rate the taste on a scale from zero to ten. They also had to guess which loaf contained the standard, 10% reduced and 20% reduced quantity. Of the 180 guesses of salt content, 63 were correct, which is not different from what would be expected by chance. The study by Rodgers and Neal indicates that small reductions in salt content will not necessarily affect sales. If food manufacturers decide to diminish the amount of salt in food, blood pressure of the entire population will shift downwards, which may result in considerable health benefits. One of Britain’s largest supermarkets, Asda, has already decided to decrease the amount of salt in its products. The Asda products will contain up to 25% less salt. The key of the reduction of salt intake is ______.
It will be safer to walk the streets because people will not need to carry large amounts of cash, virtually all financial deals will be conducted by computer.
Stem Cell Therapy May Help Repair the Heart According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure. Researchers at Pittsburgh University School of Medicine examined 20 patients who had severe heart failure and were going to have surgery. They injected stem cells into the parts of their hearts that were damaged. They then compared their hearts with those of people who had undergone surgery without having the stem cells injected into them (they had also suffered from severe heart failure). The patients who had the stem cells injected had hearts that were able to pump (用泵抽运) more blood than the others. According to Professor Robert Kormos, one of the researchers, these results could revolutionize heart treatment. Although previous studies had indicated that there might be a benefit, this is the first study that has actually proved that stem cell therapy can help the failing heart work better. All the patients in this study had hearts that could not pump blood properly. The scientists measured their ejection fraction (射血分数). It is a measure of heart performance; you measure how much blood is being pumped out by the left ventricle (心室). Healthy people’s ejection fraction is about 55%. These patients had ejection fraction of under 35%. They all had by-pass surgery (搭桥手术) performed on them. Some of the patients had stem cells taken from their hip bones and injected into 25～30 sites in the damaged heart muscle. Six months later their ejection fraction rate was 46.1% while those who just had surgery but no stem cell injections averaged 37.2%. Heart failure is a common problem all over the world. In the UK alone about 650,000 people suffer from heart failure every year. As the number of people suffering from heart failure increases in the world in general these findings are particularly significant. Current treatments relieve the symptoms. This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease. The experiment proved to be satisfactory.
气体的黏性随温度的增加而____________。液体的黏性随温度的增加而____________。
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