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In Drosophila melanogaster embryos we have identified three classes of extrachromosomal circular DNA molecules homologous to the three main families of tandemly repeated genes, 5 S, rDNA and histone. 5 S genes are present in circular multimeric molecules containing up to 16 copies of the 375(+/- 7) base-pair repeated unit. Circular molecules homologous to(More)
From extrachromosomal covalently closed circular DNA molecules purified from Drosophila melanogaster embryos, we have isolated 24 clones homologous to the histone tandemly repeated gene family. Some of the clones harbor one of the two main types of genomic repeated units of 4.8 and 5.0 kb. and probably result from homologous recombination. The remaining(More)
OBJECTIVES To determine whether digital signal processing (DSP) hearing aids produce conducted radio frequency interference that can affect the use of personal FM systems, to quantify the nature of any such interference, and to discuss practical remedies. DESIGN Sixteen DSP hearing aids were used. Measurements were made of the spectral characteristics of(More)
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