Прочитайте текст и определите какой из заголовков соответствует тексту In the last 20 years the use ...: ответ на тест 347553 - Английский язык

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In the last 20 years the use of atom medicine has become so widespread that every big medical centre uses some form of it in diagnosis and treatment. Thousands of hospitals all over the world have had very successful results with radioactive iodine for thyroid cases.
The chief medical use of radioisotopes is against cancer. Every year thousands of cancer patients are being treated with radio-cobalt, which in many ways is better than X-ray treatment.

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In the last 20 years the use of atom medicine has become so widespread that every big medical centre uses some form of it in diagnosis and treatment. Thousands of hospitals all over the world have had very successful results with radioactive iodine for thyroid cases.
The chief medical use of radioisotopes is against cancer. Every year thousands of cancer patients are being treated with radio-cobalt, which in many ways is better than X-ray treatment.

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Scientists have discovered that the beginning of coronary thrombosis can be detected and located by the use of radioactive iodine. The isotope of iodine is attracted to inflamed tissues and thus shows the exact place of thrombosis.
Electrocardiograms do not always show the beginning of a heart attack. The use of the radio-active iodine is better than electrocardiogram in this respect: it shows exactly the location of the thrombosis and it is helpful in treatment.

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Two American biochemists, Stanley H. Cohen and Herbert W. Boyer, inaugurated the science of genetic engineering – and its associated field of biotechnology – in 1973. They showed that it was possible to break down DNA into fragments and combine them into new genes, which could in turn be placed in living cells. There they would reproduce each time a cell divided into two parts.

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When Dr. Ian Wilmut introduced the world to the first successful clone of an adult mammal – a seven-month old Finn-Dorset lamb named Dolly – a new frontier in science opened wide.
In 1996, Dolly became the first large animal to be cloned from genetic material extracted from an adult cell.
Scientists inserted a cell from a ewe’s udder into an egg from the same animal after removing the egg’s DNA. The bioengineered embryo was implanted in the ewe’s womb and Dolly developed as a clone. Her birth at the Roslin Institute in Scotland was announced in 1997 and caused an international sensation.

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In some cases it is important for the surgeon to know whether an injured bone has “died” from loss of blood supply.
Few years ago it was necessary to wait several months, and sometimes even a year, for the accurate diagnosis that made treatment possible. Now surgeons have discovered how to find in a few minutes whether the bone has “died”. It is done by using a radioisotope – Sodium 24. When this isotope is pumped into the injured bone, it keeps its radio-activity if the bone is “dead”. But if the bone is still living, the blood carries away the radioisotope within ten minutes.
By measuring the amount of radio-activity left in the bone, the surgeon gets the information about the condition of the injured bone.