منابع مشابه
Unique biochemical and mineral composition of whale ear bones.
Abstract Cetaceans are obligate aquatic mammals derived from terrestrial artiodactyls. The defining characteristic of cetaceans is a thick and dense lip (pachyosteosclerotic involucrum) of an ear bone (the tympanic). This unique feature is absent in modern terrestrial artiodactyls and is suggested to be important in underwater hearing. Here, we investigate the mineralogical and biochemical prop...
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Bitcoin’s core innovation is its solution to double-spending, called Nakamoto consensus. This mechanism provides a probabilistic guarantee that transactions will not be reversed once they are sufficiently deep in the blockchain, assuming an attacker controls a bounded fraction of mining power in the network. We show, however, that when miners are rational this guarantee can be undermined by a w...
متن کاملFossil traces of the bone-eating worm Osedax in early Oligocene whale bones.
Osedax is a recently discovered group of siboglinid annelids that consume bones on the seafloor and whose evolutionary origins have been linked with Cretaceous marine reptiles or to the post-Cretaceous rise of whales. Here we present whale bones from early Oligocene bathyal sediments exposed in Washington State, which show traces similar to those made by Osedax today. The geologic age of these ...
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Whales are unique among vertebrates because of the enormous oil reserves held in their soft tissue and bone. These 'biofuel' stores have been used by humans from prehistoric times to more recent industrial-scale whaling. Deep-sea biologists have now discovered that the oily bones of dead whales on the seabed are also used by specialist and generalist scavenging communities, including many uniqu...
متن کاملWhale comeback
Last month I came across a folder of papers I had written at the age of 16 for my high school English class. This occasion, in some ways like Proust’s madeleine, triggered recollections of how I, as a 16 year-old, framed the thoughts I had about what I wanted to do with my life. One of those early papers was about Frost’s poem The Road Not Taken. I remember not terribly liking the poem. But the...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/351193a0