Прочитайте текст и определите какой из заголовков соответствует тексту In 1921 at the University of ...: ответ на тест 284139 - Английский язык

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In 1921, at the University of Toronto, Frederic Grant Banting and Charles H. Best conducted experiments that successfully isolated the hormone insulin. This hormone is used to control the disease diabetes. The name of the hormone is derived from Latin word for island, insula, because the hormone is produced in the part of the pancreas called the Isles of Langerhans.
Insulin is protein and is digested by the enzymes. Banting and Best used animal experiments to extract insulin and demonstrated that it stopped symptoms of diabetes. Commercial production of insulin uses pigs, oxen, and sheep as sources for the hormone.

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In 1921, at the University of Toronto, Frederic Grant Banting and Charles H. Best conducted experiments that successfully isolated the hormone insulin. This hormone is used to control the disease diabetes. The name of the hormone is derived from Latin word for island, insula, because the hormone is produced in the part of the pancreas called the Isles of Langerhans.
Insulin is protein and is digested by the enzymes. Banting and Best used animal experiments to extract insulin and demonstrated that it stopped symptoms of diabetes. Commercial production of insulin uses pigs, oxen, and sheep as sources for the hormone.

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Nina Ivanova is our best ward nurse. She works at our hospital and everybody respects her very much. In the morning she always come into the ward with a smile on her face. Everything she does in the ward she does quickly and quietly. Nina makes injections, puts mustard plasters and cups. She never hurts the patient with a rude word.
The doctors say: “When Nina is at work we don’t worry. We know that everything will be all right.”

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I am a nurse. I work in a therapeutic hospital. Many doctors and nurses work at the hospital. Our hospital is very large. Work at the hospital begins at 6 o’clock in the morning. The nurses begin to take the patients’ temperature at 6 o’clock. They write it down in temperature charts. Then the nurses give the patients medicines and carry out other prescriptions of the doctors. They open the windows and air the wards. The doctors come at 9 o’ clock in the morning and begin to examine the patients. Each ward nurse tells the doctor about her patients.

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A metal rectifier, a widely used form of rectifier, is the metallic type consisting essentially of a number of units formed by depositing a layer of semiconducting material, such as copperoxide on a metal conducting base. These units, generally in the form of washers, are assembled on rods under pressure, the number of units employed being determined by the voltage. Each unit has the peculiar property of passing current freely when the semi-conducting layer is positive and allowing practically no current to flow in the opposite direction. This form of rectifier has the great advantage of strength, absence of moving parts and relative simplicity.

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Another type of rectifier is represented by various kinds of two-electrode valves, or diodes. These consist of a glass tube or bulb containing an electron-emmiting member (the cathode) and an electrode (called the anode) which collects the emitted electrons and causes a flow of current so long as it is positive with respect to the cathode. The cathode heater is supplied with a suitable voltage from the transformer secondary to provide the heating necessary for the emission of electrons.