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• W2022971152 abstract "Chemical analyses were made on the spermatozoa, ova nuclei, and liver cell nuclei of the frog for DNA, DNA-phosphorus, DNA-nitrogen, PNA, PNA-nitrogen, arginine, and protein nitrogen. A method in which 70 per cent sucrose solution was used as a homogenization medium for the mass isolation of frog ova nuclei and liver nuclei was developed. All of the nuclear preparations were found to be free of acid-soluble phosphorus suggesting the absence of protoplasmic contamination. Results of the DNA analyses provide additional data in confirmation of the Boivin-Vendrely theory of the constancy of DNA in cells of the same species. Further, it is shown that, despite the high DNA concentration found in the cytoplasm of the ova of the frog and several invertebrates, the theory holds for isolated ova nuclei of the frog. The DNA content of ova nuclei of the frog, collected prior to the reductional division to the haploid state, was found to be twice that of spermatozoa. The DNA content of the nuclei of a somatic cell, liver cells, was slightly greater than twice the spermatozoan content. These results have been discussed. None of the other nuclear constituents showed a relationship similar to that of the DNA content of the nuclei of the cells investigated. The spermatozoa of the frog contained 6.48 picograms of DNA per cell. No comparative data on frog spermatozoa are available. Although the arginine content of frog spermatozoa was found to vary markedly from sample to sample, the ratio of arginine to DNA per set of chromosomes was four times this ratio for ova and liver nuclei, suggesting a higher proportion of arginine-rich proteins in the spermatozoa than in the nuclei of ova and liver cells. This finding may indicate that spermatozoa and ova of the same species differ in the types of proteins present." @default.
• W2022971152 created "2016-06-24" @default.
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• W2022971152 date "1957-08-01" @default.
• W2022971152 modified "2023-10-16" @default.
• W2022971152 title "The comparative nucleic acid content of liver nuclei, ova nuclei and spermatozoa of the frog" @default.
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• W2022971152 doi "https://doi.org/10.1016/0014-4827(57)90139-8" @default.
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