منابع مشابه
Caught napping in the time of tropical diseases.
Airline deregulation in 1978 and optimization of routes have been a boon to foreign travel, including to and from Canada, which has one of the fastest growing populations of the G8 countries. Millions of overseas tourists visit Canada each year. More than 20% (almost 7 million) of Canada’s population is foreign born, with at least 50% of new immigrants arriving from tropical locales. Recent imm...
متن کاملCaught in the act
Along with replication and mutability, living beings are set apart from the mineral background they inhabit by their metabolism—their ability to catalyse chemical reactions. Since Linus Pauling first proposed that these reactions are made pos sible by enzymes that recognize and bind tightly to their substrates at a crucial transi tion point [1], it has become increasingly clear that understan...
متن کاملCaught in the Act?
Galaxies are thought to be surrounded by massive halos of dark matter, each outweighing its galaxy by a factor of about eight. The visible part of a galaxy, occupying the inner 10% of the halo, consists of a mixture of stars and gas. Galaxies harbour a giant black hole at their centres, which in some cases is actively fuelled as it sucks in surrounding gas. In especially active galaxies, called...
متن کاملCaught in the act
The crystal structure of a HECT E3 enzyme has been captured as it transfers ubiquitin to a target protein, revealing the dramatic changes in shape that enable it to modify particular residues in its targets.
متن کاملCaught in memory
The traveller, George Shelvocke, sailing along the coast of South America in 1718, wrote: " whales, grampuses, and other fish of a monstrous bulk, are in such numbers off the coast of Patagonia that they were really offensive to us very often. For they would come sometimes so close to us as to stifle us with their stench when they blew, and would lie so near us that I have frequently thought it...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 2006
ISSN: 0028-0836,1476-4687
DOI: 10.1038/442736a