Sentence examples for are difficult and require from inspiring English sources

The detection of NifH in our proteomic study might correlate with reports of expression of nitrogenase in Bradyrhizobium strains under free-living conditions; however, measurements of nitrogenase activity under these conditions are difficult and require a fine adjustment of the oxygen concentration [ 58– 61].

But the introduction noted that "the steps toward sovereignty and democracy will be difficult and require patience and time".

Such proof would be difficult and require evidence from many studies, Dr. J. Thomas Grayston of the University of Washington in Seattle, wrote in the editorial.

Convincing private holders of Greek bonds to voluntarily accept later repayment could be difficult and require costly guarantees to avoid a hit to banks.

It should get across the idea that important books may be difficult and require some slow and patient reading.

Putting this into practice can be difficult and require us to push out of our comfort zone.

Such a course may be difficult and require arduous long-term diplomatic efforts, but given the potential costs of losing the Treaty, it is the correct one.

On the other hand, demonstrating the benefit of a mixture over a single component vaccine may be difficult and require careful trial design.

Getting family members to ask exploratory questions may be difficult and require prompting.

Overcoming this traditional care bias will be difficult and require considerable education for all members of the ICU team.

Generalising this approach to technologies which do not comply with these pre-requisites may be difficult and require additional costs.