Antifreeze glycoproteins from Polar fish. Effects of freezing conditions on cooperative function.
نویسندگان
چکیده
منابع مشابه
Antifreeze glycoproteins from Arctic fish.
Four species of fish in the Barents Sea of the Arctic, north of Norway and Russia, were caught and examined for the presence of antifreeze proteins in their blood sera. Only one species of Arctic fish, the polar cod (Boreogadus saida), was found to contain an antifreeze protein. Antifreeze glycoproteins were isolated and characterized from the blood serum of the Arctic fish, and their structure...
متن کاملAntifreeze Glycoproteins from an Antarctic Fish
A quasi-elastic light-scattering technique was used to study the hydrodynamic conformations of antifreeze glycoproteins from an Antarctic fish. Antifreeze glycoprotein is composed of repeating units of Ala-Ala-Thr, with each threonine O-linked to a disaccharide, and it exists as several polymers of different numbers of this repeating unit. Molecular weights of the two major active polymers are ...
متن کاملNonhepatic origin of notothenioid antifreeze reveals pancreatic synthesis as common mechanism in polar fish freezing avoidance.
Phylogenetically diverse polar and subpolar marine teleost fishes have evolved antifreeze proteins (AFPs) or antifreeze glycoproteins (AFGPs) to avoid inoculative freezing by internalized ice. For over three decades since the first fish antifreeze (AF) protein was discovered, many studies of teleost freezing avoidance showed hepatic AF synthesis and distribution within the circulation as pivota...
متن کاملFreezing resistance of antifreeze-deficient larval Antarctic fish.
Antarctic notothenioids, along with many other polar marine fishes, have evolved biological antifreeze proteins (AFPs) to survive in their icy environments. The larvae of Antarctic notothenioid fish hatch into the same frigid environment inhabited by the adults, suggesting that they must also be protected by sufficient AFPs, but this has never been verified. We have determined the contribution ...
متن کاملthe effects of cooperative versus individual directed reading thinking activities on students inferential and referential questions
two groups of students were assigned as experimental and control ones, and were given instruction on directed reading-thinking activities and after some treatment, they were post-tested. although the initial pre-test did not show any significant differences, the final post-test result revealed that the cooperative reading comprehension helped the experimental group. the cooperative students’...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1980
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(19)86227-0