The marked variability of mixed siliciclastic-carbonate sequences makes the definition of a universal sequence stratigraphic model impossible, as the composition and geometries of systems tracts may change considerably, and sequence stratigraphic surfaces and facies contacts may vary in terms of occurrence and physical expression.
This has made it problematic to identify clearly these contacting segments as part of a universal sequence block alignable across both Bacteria and Archaea [ 3].
The internal part of these probes is a universal sequence that allows for simultaneous amplification of all circularized, captured sequences prior to massively parallel sequencing.
Influenced by the evolutionary theses of Charles Darwin and Herbert Spencer and by Thomsen's three-age system, Morgan later proposed a universal sequence of cultural evolution in his book Ancient Society; or, Researches in the Lines of Human Progress from Savagery Through Barbarism to Civilization (1877).
The PCR reaction was carried out with three primers, including a locus specific primer extended with a universal sequence of 17 nucleotides (5'- GaCCGGCAGCAAAATTG-3'), a reverse locus specific primer and a universal primer of 17 nucleotides that was 6-Fam, Hex or Tet 5'-labelled (MWG AG Biotech, Ebersberg, Germany).
We designed and tested siRNAs against each isoform of Opn4 as well as a universal sequence that silenced both isoforms.
The RT chimeric primer consists of a gene-specific and a universal sequence with or without 10- or 15-base linkers (Table 1).
Author's response: Calling the TOL a universal sequence tree in much of the current literature would have addressed many of our concerns as well, but your arguments have convinced us TOC is more precise in several places.
With the introduction of a third universal sequence flanking the barcode and the universal primer sites, one can begin to envision a two-dimension informational barcode, a concept we call "multiplexing multiplex padlocks" (MMP) (Figure S6).
Due to the low overall sequence similarity among S-layer protein genes and the lack of a universal signature sequence, confirmation of the presence of an S-layer still relies largely on electron microscopy.
