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- W2016194811 abstract "Nonnucleate fragments of eggs of the sea urchinStrongylocentrotus purpuratus were made by sucrose density gradient centrifugation. The synthesis of RNA and of protein was studied in the nonnucleate fragments after artificial activation with butyric acid. Ethidium bromide inhibited the incorporation of uridine-5-3H into RNA by activated nonnucleate fragments and by cleaving embryos more effectively than did dactinomycin. The incorporation of uridine-5-3H into high molecular weight RNA was inhibited by 10 μg/ml of ethidium bromide by about 97% in nonnucleate fragments, 85% in fertilized eggs and 53% in blastulae. The electrophoretic pattern of proteins labeled in activated nonnucleate fragments, in sodium dodecyl sulfate polyacrylamide gels, was not qualitatively altered by 6 hours of preincubation with 10 μg/ml of ethidium bromide. The range of molecular weights for the labeled proteins was 9 to 40 thousand for those found in the 15,000g supernatant fraction of the homogenate and 6 to 60 thousand for those in the corresponding pellet. These results establish that most, or possibly all, of the types of proteins labeled after artificial activation of nonnucleate fragments are synthesized upon RNA templates which were present in the unfertilized egg. Continuous exposure to various concentrations of ethidium bromide affected development. Two micrograms per milliliter produced a prism stage larva with an abbreviated gut and 5 μg/ml arrested development at the blastula stage. At 10 μg/ml of development did not proceed beyond the 4- to 8-cell stage. When mesenchyme blastulae or gastrulae were treated with 10 μg/ml of ethidium bromide, development ceased, but the embryos continued to swim for at least 30 hours." @default.
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- W2016194811 date "1971-02-01" @default.
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- W2016194811 title "Protein synthesis and development in the absence of cytoplasmic RNA synthesis in nonnucleate egg fragments and embryos of sea urchins: Effect of ethidium bromide" @default.
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- W2016194811 doi "https://doi.org/10.1016/0012-1606(71)90096-0" @default.
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