Sentence examples for been difficult to perform from inspiring English sources

It has been difficult to perform tracheal allotransplantation without immunosuppression.

Live Memory analysis on the Linux platform has traditionally been difficult to perform.

Traditionally it has been difficult to perform large-scale chemical screens in vivo.

T-cell assays assessing autoimmune T-cell responses have been difficult to perform and validate for use in diabetes research.

Meta-analyses have been difficult to perform due to different methodological approaches, treatment modalities and rehabilitation programs.

This enabled target prediction at genome level, which would have been difficult to perform using original Targetfinder.

One reason is that it's difficult to perform.

But clinical trials are difficult to perform with children.

"Sometimes it's difficult to perform because I get lost in the words," he says.

"It was difficult to perform well, but we will win in Sudan because the atmosphere will be calmer".

Such manipulations are difficult to perform with precision, because the bonds between the carbon and hydrogen atoms are strong.