Sentence examples for has presented major from inspiring English sources

Since defecting to the BBC in 2007, Mrs Logan has presented major football, rugby and athletics events and played a leading role in the corporation's 2012 Olympics coverage.

Dating of evolutionary events has presented major difficulties in phylogeographic studies of birds.

Heterologous expression of chemosensory receptors has presented major technical difficulties in the field, so while many TAARs remain orphan receptors, we consider identifying the first ligands for 11 TAARs (including the first ligands for any clade III TAARs) an advance.

Fibroblast growth factors are peptides involved in signalling for correct vertebrate development in vivo and determining their function has presented major difficulties as many knock-out studies are lethal in embryonic stages or do not cause any particular phenotype as a result of the redundancy of this family (Itoh, 2007).

Where once it was somewhat easier for striving low-income people (or, at least, their children) to ascend to the working and middle classes, in recent years stagnant wages, the decline of unionization of the private work force, insufficient subsidies for child care and skyrocketing college tuition have presented major challenges for those trying to escape from poverty.

The body barriers like dynamic, tissue, and ocular blood barriers have presented major challenges to the formulation scientists and pharmacologists in the development of ocular drug delivery for decades.

We also note that although we have presented major findings in interquartile range change as well as 10-µg/m increments, some direct comparisons between previously published study findings and ours are limited because of differences in the units used for incremental change.

For thirty-six years now, the enmity between Tehran and Washington has presented a major barrier to progress in the region.

David H. Laufman, who was not involved in the Aipac case but served as a national security prosecutor, said the Rosen and Weissman prosecution "has presented a major dilemma for the department because of the rulings from the district court about the need to disclose more and more information to the defense".

The current poor understanding of the structure and properties of the DEJ has presented a major obstacle to designing better therapeutic protocols for complications concerning the DEJ.

However, changing the behaviour of health workers on this matter has presented a major challenge to the program in Madagascar [37].