Sentence examples for is challenged however from inspiring English sources

There are a growing number of compound databases, and the dominance of Chemical Abstracts is challenged; however, the mere diversity of these databases poses its own difficulty.

This model is challenged, however, by the presence of both transitions and transversions in the Hematodinium sp. mitochondrion.

Real and large scale change is challenged, however, by limited government capacity and commitment to changing practises and to allocating sufficient resources for social work towards child protection.

Obtaining complex profiles is challenging, however, due to highly coupled dynamics inside the injector.

Keeping new infectious organisms out of the U.S. is challenging, however, because there is virtually no federal oversight over the import of companion animals.

Designing dynamic mechanisms is challenging, however, when agents are strategic and can benefit by misreporting their demands for resources.

Selling to this market is challenging however, because a lot of this consumer demand is often just talk.

It needs to be pointed out that the strictly mathematical proof of the two propositions is challenging; however, they can be numerically verified through computer simulationsa.

Maintaining high data quality is challenging, however reliable descriptive results have been obtained.

Manually dissecting blastocysts is challenging however and it is unavoidable that few TE cells remain attached to the ICM.

(This standard interpretation has been challenged, however).