ABSTRACT. We cloned a 4414-bp element from a mutant of Drosophila melanogaster. Its insertion site was 18,929,626 bp. Analysis of the nucleotide and amino acid sequences demonstrated that the element is homologous to Pifo_I, first obtained from D. yabuka, which belongs to the gypsy/Ty3 subfamily. We also obtained a 3754-bp length element from a wild-type fly by PCR, with a pair of primers designed from the conserved region of the 4414-bp length element. The two elements included a pair of long terminal repeats and part of the GAG and ENV proteins, but the POL protein was completely lost. This element is found in the subgenus of D. melanogaster, but it is a degenerate type of Pifo_I and is not infective. Also, a 714-bp region structured in 5.0 tandem repeats of 143 bp each was found in the 5ꞌUTR of the degenerate element; these could interact with transcription factor CF2. Phylogenetic analysis and alignment of amino acids indicated that the Pifo_I element was closer to the ZAM retrotransposon, which gave us some clues to their functional similarity. Based on these data, we propose that there is a relationship between the degenerate element
The extremely neutron-deficient even-even uranium isotopes 216,218 U were produced in the complete-fusion reactions induced by impinging 40 Ar and 40 Ca ions on 180,182,184 W targets. Fusion evaporation residues were separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure) and subsequently identified using the recoil-α-correlation method. The improved ground-state to ground-state α-decay properties of 216,218 U were reported in [Z. Y. Zhang et al., Phys.Rev .Lett.126, 152502 (2021)]. In this paper, we report on new α-decay activities with E α = 10 163(27) keV for 216 U and E α = 10 073(16) keV for 218 U, which decay from the 8 + isomeric states of 216,218 U into the 2 + states of their daughter nuclei 212,214 Th, respectively. The new results extend the systematics of the α-decay fine structure for the N = 124 and 126 even-even isotones.
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