CATEGORIES:
BiologyChemistryConstructionCultureEcologyEconomyElectronicsFinanceGeographyHistoryInformaticsLawMathematicsMechanicsMedicineOtherPedagogyPhilosophyPhysicsPolicyPsychologySociologySportTourism
Change the active into the passive.1. By adding heat to a solid body we transform it into a liquid. 2. They compared the experimental and theoretical data. 3. He has approached this problem in different way. 3. I hope they will get some interesting results in the course of their work. 4. They are measuring the radius of the tubes. 5. When the scientific supervisor entered the room the students were finishing the calculations. 6. The author has presented entirely false picture of his actual procedure of discovery. 7. Faraday had discovered this law before Maxwell wrote it in differential form.
Warm-up (2) Do you agree with some researchers who claim that a little hunger can lengthen our life?
Vocabulary (2) Match each word in the first column with its explanation in the second column.
Reading (2)
OF MICE AND MEN The amount of food available influences metabolism. In the 1930s it was discovered that underfeeding laboratory mice extend their life. When mice were subjected to dietary restriction, it increased the activity of maintenance and repair systems. A period of famine is a bad time to reproduce, and some evidence suggests that during famines certain animals will do better to switch off their fertility, diverting a large fraction of their remaining energy to cell maintenance. The notion of caloric restriction - and its purpose is to extend life span - has captured the attention of people who wish to live longer. But such a mechanism is much less likely to work for us because our slow-paced metabolism differs greatly from that of organisms in which this strategy has already been tested. Dramatic extension of life span has indeed been achieved in worms, flies and mice. These short-lived animals have urgent need to manage their metabolism in a way that adapts rapidly to changing circumstances. We humans, in any case, may not have the same flexibility in altering our own metabolic control. Immediate metabolic effects, of course, occur in humans who undergo voluntary dietary restriction, but only time - many hungry years - will tell if these have any beneficial impact on the aging process and, in particular, on longevity. The goal of gerontology research in humans, however, is always improving health at the end of life, rather than achieving Methuselean life spans.
Practice (2)
Comprehension: Date: 2015-12-11; view: 944 |