This "gotta catch 'em all" mentality pushes those with this competitive desire to systematically tick species off a list until they complete the whole set, whatever the cost.
Despite the wide use of these methods, annotation of complete signaling pathways has not yet been transferred systematically between species.
It would also suggest that, even if senescence is detectable given a large enough sample-size [3], [4], [5], its relevance to fitness in natural populations may vary systematically among species according to their life span.
Second, even within this framework of conserved peak and trough locations, the actual GC3s values of orthologous genomic regions can shift significantly and systematically between species (figs. 1 and 2).
Denser molecular sampling of these East Asian genera is therefore highly desirable, both to generate a better resolved and better supported phylogeny and to place phylogenetically the remaining, systematically ambiguous species.
Systematically probing 352 species from all major groups of land plants, Palmer's team found that only the 11 liverwort species lacked the introns.
Here we have made an attempt to systematically study these species using a wide set of accessions representing wild tetraploid T. dicoccoides and three diploid A genome progenitor species (Additional file 1).
However, a standardized approach for systematically monitoring alien species and tracking biological invasions is still lacking.
Changes in Xmax and Ms occur fairly systematically across titanomagnetite species, with Ms/Xmax initially increasing with pressure, before reaching a constant value where Ms becomes proportional to 4/3 Xmax.
It is not a history of ornithology but a natural history, a handbook or field guide systematically describing every species of bird known to occur in Britain.
