منابع مشابه
Light Echoes of Ancient Supernovae in the Large Magellanic Cloud
In the SuperMACHO project, we have imaged the bar of the Large Magellanic Cloud (LMC) repeatedly and used an automated pipeline to subtract point-spread function matched template images from the recent epoch images. The resulting difference images are remarkably clean of the constant stellar background and are ideal for searching for variable objects. Using these difference images, we have mapp...
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In this article I will briefly review the current status of radio observations of nearby supernovae and their remnants. This review will initially address observations of the radio light curves of nearby core-collapse supernovae, followed by a more detailed summary of recent Very Long Baseline Interferometric observations of the expansion of nearby supernovae and their remnants. These later sec...
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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...
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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...
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ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/269734a0