By James Trefil Physics Professor
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Take a incredible photographic examine Britain’s plant life and faunaFrom golden eagles within the Scottish Highlands to Portuguese guy o struggle jellyfish off the coast of Cornwall, Britain boasts an amazing array of natural world and habitat. discover its remarkable attractiveness, range and beauty from the relief of your living room.
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Extra info for 101 Things You Don't Know About Science and No One Else Does Either
Later, using a technique called positron emission tomography (PET), molecules containing a radioactive oxygen isotope were injected into a person's bloodstream. Over a period of several minutes, the oxygen isotope would undergo radioactive decay and emit particles called positrons, which could be detected outside the body. Watching a PET scan, you could see regions of the brain ''light up" as they drew more blood for their tasks. More recently, radioactive markers have been attached to molecules that are known to interact only with certain types of receptors in specific cells.
These two effects acting together mean that the human immune system is constantly facing new kinds of viruses. This is one reason why you have to be inoculated against new forms of influenza virus every year. It also is one reason why a virus that was previously confined to monkeys, for example, can suddenly shift over and start infecting humans. In the days before widespread travel, a particularly deadly virus could devastate or even wipe out the population in a small areathink of the 1995 outbreak of Ebola virus in Zaire.
This is the cerebral cortex, the outer covering of the brain. Today, using a new technique called functional magnetic resonance imaging (fMRI), scientists are learning how this quintessentially human organ works. It's hard to overestimate the importance of this particular breakthrough. Not so long ago, the only way you could investigate brain function was to inject a radioactive isotope into an animal, kill it, and section the brain tissue. You could then examine how the isotope had accumulated in various regions and deduce which sections of the brain had been active.