منابع مشابه
Macroevolutionary chemical escalation in an ancient plant-herbivore arms race.
A central paradigm in the field of plant-herbivore interactions is that the diversity and complexity of secondary compounds in plants have intensified over evolutionary time, resulting in the great variety of secondary products that currently exists. Unfortunately, testing of this proposal has been very limited. We analyzed the volatile chemistry of 70 species of the tropical plant genus Burser...
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E ver since Vincent Knapp published his 1999 article ‘‘How old is Endometriosis?’’ (1), there seems to have been renewed interest in identifying just when endometriosis was discovered as a distinct disease entity. While the history of endometriosis subsequent to its 1860 microscopic unveiling by Karl von Rokitansky has been well-studied, its story leading up to that moment has remained largely ...
متن کاملHow ancient are ancient asexuals?
Ancient asexual animal groups, such as bdelloid rotifers and darwinuloid ostracods, are excellent model organisms to study the effects of long-term asexuality. However, the absolute length of time that these groups have been fully asexual is mostly ignored. In the case of the darwinuloid ostracods, the fossil record shows that sexual reproduction disappeared almost completely after the end of P...
متن کاملCancer in ancient iranian medical books
In medical history of different nations, there are numerous documents concerning cancer. The present study is an investigation in ancient books to determine the part that medicine of Iran has played in the recognition of cancer. In all 31 Iranian medical and 5 Islamic medicine books mostly from 8 to 18 cent. A.D. have been examined. The findings showed that cancer in ancient medical books of Ir...
متن کاملGradual Arms Reduction
ance.” He acknowledged that, in order to defend themselves against the Soviet threat as long as i t lasts, the peoples on both sides of the Atlantic must be linked together, and more specifically, he asserted that despite divergencies over the organization and functioning of the alliance itself, France and the United States would be side by side again in the event of a general war. In short, on...
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ژورنال
عنوان ژورنال: Nature
سال: 2009
ISSN: 0028-0836,1476-4687
DOI: 10.1038/459784a