منابع مشابه
Helium: impending crisis for radiology, or just more hot air?
It is one of the most ubiquitous elements in the universe, second only to hydrogen. Balloons filled with it are almost everywhere and can be purchased for only a few dollars. One can easily be forgiven for assuming that helium, which plays a currently irreplaceable role in the superconducting magnets used in MRI and particle accelerators, is not only relatively easily obtained but in inexhausti...
متن کاملMore than just big ears
To the non-specialist, large ears in elephants used to mean African, small ears, Indian. But to taxonomists African elephants have long posed a more complex puzzle. During the nineteenth century, it was fashionable for wealthy trophy hunters to assign their own names to species they had shot destined for the museums of Europe. At least 18 elephant subspecies were claimed following this fashion....
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ژورنال
عنوان ژورنال: Epilepsy Currents
سال: 2006
ISSN: 1535-7597,1535-7511
DOI: 10.1111/j.1535-7511.2006.00103.x