Salamander's egg surprise
Scientists have stumbled across the first example of a photosynthetic organism living inside a vertebrate's cells. The discovery is a surprise because the adaptive immune systems of vertebrates generally destroy foreign biological material windows product key. In this case, however, a symbiotic alga seems to be surviving unchallenged and might be giving its host a solarpowered metabolic boost Pandora Necklace. The salamanders' viridescent eggs are coloured by algae living in the jellylike material that surrounds the embryo. The embryos produce nitrogenrich waste that is useful to the algae, which, in turn, supply the developing embryos with extra oxygen. The algae clearly benefit their salamander hosts: Lynda Goff, a molecular marine biologist at the University of California, Santa Cruz casque beats by dre pas cher, showed 30 years ago that salamander embryos lacking algae in their surrounding jelly are slower to hatch.
Ryan Kerney of Dalhousie University in Halifax tiffany blue nikes, Nova Scotia, Canada toms shoes, has now found that these algae also live inside the embryo's cells. Such a close coexistence with a photosynthetic organism has previously been found only in invertebrates, such as corals. Kerney took longexposure fluorescent images of prehatchling salamander embryos, and saw scattered dots in the unstained tissue an indicator that it might contain chlorophyll vanessa bruno. Transmission electron microscopy (TEM) images showed mitochondria in the salamander cells clustering close to the algae. Reporting the discovery on 28 July at the Ninth International Congress of Vertebrate Morphology in Punta del Este, Kerney suggested that the mitochondria might be taking advantage of both oxygen and carbohydrate generated by the alga's photosynthesis.
So when do the algae enter the embryos' cells oakley frogskins? A timelapse video made by Roger Hangarter at Indiana University in Bloomington, and presented by Kerney at the meeting toms shoes, reveals a fluorescent green flash an algal bloom next to each embryo just as its nervous system begins to form. Most research on spotted salamander embryos has focused on earlier periods of development, which might explain why algae have not been seen inside the cells before.
One of Kerney's most curious discoveries suggests that the algae may be a maternal gift nike free. He has found the same algae in the oviducts of adult female spotted salamanders, where the embryoencompassing jelly sacs first form.
David Wake monster beats, an emeritus professor at the University of California, Berkeley, who watched Kerney's presentation, wonders whether algae could be getting into the reproductive cells ghd straighteners. This would "really challenge the dogma" that vertebrates' immune systems ban such close relationships chan luu sale, he says. Both Wake and David Buckley bred 11s, who studies salamander development at the National Museum of Natural Sciences in Madrid grape 5s, agree that the work might tell us more about how vertebrate cells learn to identify intruders.
"It makes me wonder if other species of salamander that have known symbiotic relationships with algae also harbour algae inside their cells windows 7 product key," adds Daniel Buchholz, a developmental biologist at the University of Cincinnati in Ohio. "I think that if people start looking we may see many more examples."Related：

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