منابع مشابه
SNAKES, ROTATORS, SERPENTS, AND THE OCTAHEDRAL GROUPt
Specific configurations of horizontal and vertical bending magnets are given that, when acting on the spin polarization vector of a particle beam, generate a group of 24 operators isomorphic to the group of rotational symmetries of a cube, known as the octahedral group. Some of these configurations have the feature of converting transversely polarized beams to longitudinally polarized beams (or...
متن کاملHow tubular venom-conducting fangs are formed.
Elapids, viperids, and some other groups of colubroid snakes have tubular fangs for the conduction of venom into their prey. The literature describing the development of venom-conducting fangs provides two contradictory accounts of fang development. Some studies claim that the venom canal forms by the infolding of a deep groove along the surface of the tooth to produce an enclosed canal. In oth...
متن کاملViper fangs: functional limitations of extreme teeth.
The fangs of vipers are extremely long, rotating, hollow teeth. Analysis of video records of more than 750 strikes recorded at 60 or 250 frames per second for 285 individuals representing 86 species in 31 genera shows that vipers reposition fangs after initial contact with prey in more than a third of the strikes. Repositioning resulted when fangs missed prey entirely or hit prey regions that d...
متن کامل"protovipers" and T H E Evolution O F Snake Fangs
Anthony (1955) argued in his summary report on the venom apparatus of snakes that the fang of viperid snakes evolved from a maxillary tooth, specifically a tooth a t the posterior end of the maxilla. He identified specific colubrid snake genera which, when aligned into a morphocline (sensu Maslin, 1952), showed an increasing similarity in maxillary tooth form to the viperid solenoglyph fang. Si...
متن کاملFrom Fangs to Pharmacology: The Future of Snakebite Envenoming Therapy.
The snake is the symbol of medicine due to its association with Asclepius, the Greek God of medicine, and so with good reasons. More than 725 species of venomous snakes have toxins specifically evolved to exert potent bioactivity in prey or victims, and snakebites constitute a public health hazard of high impact in Asia, Africa, Latin America, and parts of Oceania. Parenteral administration of ...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1896
ISSN: 0036-8733
DOI: 10.1038/scientificamerican04181896-16919bsupp