Sentence examples for had been difficult to evaluate from inspiring English sources
As staff in home care services work alone in the patients' homes, their professional competence in observing, assessing, and documenting health issues had been difficult to evaluate.
In any case, the purpose of the fifth sulfide in the catalytic cycle of the C-cluster had been difficult to evaluate before structural data on substrate and analogue binding was acquired.
Membership has been difficult to evaluate more recently; church officials give different estimates and often define membership differently, according to an individual's level of involvement.
The therapeutic effects of the Sonic hedgehog (Shh) have been difficult to evaluate because of its relatively short serum half‐life.
Although vast numbers of glycanases are predicted to work processively, it has been difficult to evaluate processivity by means of biochemical experiments, and therefore the structure function relationship of processive glycanases is poorly understood.
The importance of the immune response against tumor antigens in virotherapy efficacy is now well recognized, however, its relative contribution versus the intrinsic oncolytic capacity of viruses has been difficult to evaluate.
While fire shapes the structure of forests and acts as a keystone process, the details of how fire modifies forest structure have been difficult to evaluate because of the complexity of interactions between fires and forests.
Consequently, controls underlying the size spectrum of the global biota have been difficult to evaluate.
In spite of its apparent simplicity, this idea has been difficult to evaluate empirically, and coadaptation of host and parasite traits is usually assumed rather than demonstrated.
