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Article
Eliminated sequences with different copy numbers clustered in the micronuclear genome of Tetrahymena thermophila
As the ciliated protozoan Tetrahymena thermophila develops a new macronucleus (MAC) from products of its micronucleus (MIC), several repetitive sequences are eliminated from the MAC genome. Four MIC DNA clones co...
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Article
The 5S ribosomal RNA gene clusters in Tetrahymena thermophila: strain differences, chromosomal localization, and loss during micronuclear ageing
The organization of the 5S genes in the genome of Tetrahymena thermophila was examined in various strains, with germinal ageing, and the 5S gene clusters were mapped to the MIC chromosomes. When MIC or MAC DNA is...
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Article
Nucleotide sequence divergence among DNA fractions of different syngens of Tetrahymena pyriformis
The magnitude of the differences in base sequence of DNA fractions derived from different syngens of the ciliated protozoan Tetrahymena pyriformis was investigated. Each DNA was fractionated into unique and repea...
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Article
Intersyngenic variations in the esterases and acid phosphatases of Tetrahymena pyriformis
The esterase and acid phosphatase isozymes were surveyed in strains of syngens 2–12 under conditions found to be optimal for syngen 1. Both intersyngenic and intrasyngenic variations were found. Comparisons of...
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Article
Intersyngenic variations in the esterases of bacterized Paramecium aurelia
The esterase isozymes were surveyed in bacterized stocks representative of all 14 syngens of Paramecium aurelia by starch gel electrophoresis. The properties of substrate specificity and independent variation of ...
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Article
Intersyngenic variations in the esterases of axenic stocks of Paramecium aurelia
The esterase isozymes were surveyed in axenic stocks of syngens 1, 2, 4, 5, 6, and 8 of Paramecium aurelia by starch gel electrophoresis. In paramecia there appear to be four types of esterases which are clearer ...
