Sperm nose

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By Peter Aldhous. The researchers have found that rat sperm carry two types of molecule which are also found in cells lining the nose. These are the same molecules that allow nasal cells to respond to odours.

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Marc Spehr and his colleagues at Ruhr University Bochum in Germany found a previously unknown odorant receptor in human testicular tissue called hOR To figure out how it worked, they cloned the receptor and transplanted it into human embryonic kidney cells to look for chemical compounds, or ligands, that would activate it. Out of a mixture of some synthetic compounds, the team found one that worked best: bourgeonal.

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Mailing address: P. BoxSan Diego, CaliforniaU. I would like to dedicate this paper to my major professor, Kenneth S. Norris and acknowledge the years of stalwart support and sage advice he provided.

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In the Aug. A man's sperm seek out a variety of floral scents, suggesting that these microscopic swimmers possess a primitive kind of nose that enables them to navigate to a woman's egg. This discovery could inspire new forms of contraception or improvements in in vitro fertilization, say researchers.

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Sperm whales are highly acoustic animals that emit powerful, regular clicks almost continuously while they are underwater. In large males, up to one third of the entire body length is made up of the huge nose, the world's largest biological sound generator. The incredibly successful evolution of sperm whales as acoustic specialists is due to the fact that sound propagates through water more effectively than any other form of energy.

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Super sniffers. The same receptors that help sperm locate the egg also function in our sense of smell. An inability to appreciate the smell of a certain flower may indicate that a man is infertile, a new study suggests.

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It is the only living member of the genus Physeter and one of three extant species in the sperm whale familyalong with the pygmy sperm whale and dwarf sperm whale of the genus Kogia. The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. The females cooperate to protect and nurse their young.

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Researchers have found that a human olfactory receptor protein previously shown to act in sperm, where it appears to help guide sperm to the egg during fertilization, is also expressed in human olfactory tissues in the nose and functions in our sense of smell. This remarkable dual capacity marks a functional range previously unknown for mammalian olfactory receptor proteins. Having sperm successfully locate the egg is a crucial step in fertilization.

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