BACKGROUND Accurate identification of sheep nematodes is a critical point in epidemiological studies and monitoring of drug resistance in flocks. However, due to a close morphological similarity between the eggs and larval stages of many of these nematodes, such identification is not a trivial task. There are a number of studies showing that molecular targets in ribosomal DNA (Internal transcri...

The nucleotide sequences of the rRNA genes and the 5' flanking region were determined for R. salmoninarumATCC 33209T from overlapping products generated by PCR amplification from the genomic DNA. Comparisonof the sequences with rRNA genes from a variety of bacteria demonstrated the close relatedness between R.salmoninarum and the high G+C group of the actinobacteria, in particul...

The hypothesis that Dysoxylum (Meliaceae), as currently circumscribed, is polyphyletic tested. Analyses based on nuclear ribosomal ITS, ETS, the plastid trnL-trnF intron and intergenic spacer, well rps15-ycf1 spacer support this hypothesis. Six strongly supported clades within s.l. were recovered, in large part supporting classification of Harms. Based largest molecular phylogenetic tree hither...

Periodontitis has been associated with the presence of Porphyromonas gingivalis, and previous studies have shown phenotypic differences in the pathogenicities of strains of P. gingivalis. An accurate and comprehensive phylogeny of strains of P. gingivalis would be useful in determining if there is an evolutionary basis to pathogenicity in this species. Previous phylogenies of P. gingivalis stra...

From a rRNA repeating unit (9.1 kbp) of mustard we have The DNA was sequenced according to the method of Maxam sequenced the first internal transcribed spacer, the 5.8S rRNA and Gilbert gene, and the second internal transcribed spacer [1]. Here, we present the nucleotide sequence of a 5500 bp fragment containing the 3 ' end terminus of the 25S gene (486 bp), the intergenic spacer REFERENCES (32...