Sentence examples for have now challenged from inspiring English sources
He and Stoop, together with postdoc Romain Lagrange, have used their equation to predict the morphing patterns in a donut-shaped object, which they have now challenged Reis to reproduce experimentally.
The pine martens are creating a "landscape of fear", rather like the one that some ecologists (though others have now challenged the claim) believe wolves have generated among deer in Yellowstone National Park in the US state of Wyoming.
Global market forces have now challenged both concepts; markets regularly interfere in a country's domestic business, and openly claim extra-territorial rights.
Ideologically speaking the dissidents have now challenged Mr Adams in a way the murder of fellow Irishmen would not have done.
In a move that surprised no one, scores of not-for-profit organizations have now challenged the accommodation that the Court seemingly blessed less than two years ago.
We have now challenged this conclusion by showing that Tsix fine-tunes H3K27me3 at the hotspot itself, and is required for appropriate expression of Cnbp2 and Xpct genes.
He has now challenged the players to repeat what they usually do every year and kick on in the new year.
The Guardian has now challenged Missouri's refusal to provide any information in the Cole County circuit court that covers the state's capital, Jefferson City.
Cole has now challenged this, providing evidence that he remains a high-class footballer, and more defensively sound than either Shaw or Leighton Baines, who would find his first-choice spot challenged should Cole make the cut.
A feeling that Mr Blair has neglected the Commons, and is in danger of getting Labour's "central narrative" wrong, explains why one bolshy backbencher, Andrew MacKinlay, has now challenged Clive Soley, an arguably too-obedient former probation officer, for the chairmanship of the parliamentary party.
Redknapp feared at one stage that injury-plagued Woodgate's career was over but he has now challenged the former Real Madrid man to get back to the kind of form that saw him become an England regular and earn a contract extension.
