Antarctic fishes that manufacture their own antifreeze proteins to survive in the icy Southern Ocean also suffer an unfortunate side effect, researchers report: The protein-bound ice crystals that accumulate inside their bodies resist melting even when temperatures warm. The finding is reported in the Proceedings1 of the National Academy of Sciences.We discovered what appears to be an undesirable2 consequence of the evolution of antifreeze proteins in Antarctic notothenioid fishes, said University of Oregon doctoral student Paul Cziko, who led the research with University of Illinois animal biology professors Chi-Hing Christina Cheng and Arthur DeVries. What we found is that the antifreeze proteins also sTOP internal ice crystals from melting. That is, they are anti-melt proteins as well.Five families of notothenioid fishes inhabit the Southern Ocean, the frigid3 sea that encircles Antarctica. Their ability to live in the icy seawater is so extraordinary that they make up more than 90 percent of the fish biomass of the region.DeVries discovered antifreeze proteins in Antarctic notothenioid fishes in the late 1960s, and was the first to describe how the proteins bind4 to ice crystals in the blood to prevent the fishes from freezing.In the new study, the team investigated whether the antifreeze protein-bound ice crystals inside these fishes would melt as expected when temperatures warmed. When researchers warmed the fishes to temperatures above the expected melting point, some internal ice crystals failed to melt. Ice that doesnt melt at its normal melting point is referred to as superheated.The researchers also found ice crystals in wild notothenioid fishes swimming in relatively5 warmer Antarctic summer waters, at temperatures where they would be expected to be free of ice. By testing the antifreeze proteins in the lab, the team found that these proteins also were responsible for preventing the internal ice crystals from melting.Our discovery may be the first example of ice superheating in nature, Cheng said.
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1 proceedings n.进程，过程，议程；诉讼；公报 参考例句： He was released on bail pending committal proceedings. 他交保获释正在候审。 to initiate legal proceedings against sb 对某人提起诉讼
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