Sentence examples for been difficult to validate from inspiring English sources

Three-dimensional canopy energy transfer models have traditionally been difficult to validate.

It has been difficult to validate models of spindle assembly due to a lack of information on the organization of microtubules in these structures.

C5a2 is a non-signalling GPCR and its role has been difficult to validate due to the unavailability of selective ligands.

Nevertheless, when tested in natural populations and in laboratory conditions, some types of cooperation have been difficult to validate.

Factors associated with chemoresistance in vitro have been difficult to validate in vivo.

Altered motion has been difficult to validate due to the difficulty of finding a suitable reference standard.

It is difficult to validate all of these potential biomarkers because each validation requires it own specific and sensitive test, which together is rate-limiting.

During data entry, there are some built-in data validation steps, but despite this it is difficult to validate all of the data entered and we have to accept that there might be some errors.

Although the presented dollar values are difficult to validate, the model strongly suggests that the three divergent trajectory patterns are valid since the increases and decreases in households represent expanding and contracting economic scenarios adequately.

One possibility for the relatively low confirmation rate of the data from the AD-C library is that the increases in the expression of unconfirmed transcripts were small and, therefore, might also be difficult to validate by qRT-PCR, although this wasn't evident in the qRT-PCR validation of down regulated genes from the C-AD library.

However, the accuracy of the model was difficult to validate.