Sentence examples for are usually problematic from inspiring English sources

The employed protocols are usually problematic and not viable on a big scale.

In fact, Yuval-Greenberg and colleagues [31] extensively studied this issue and noted that saccades are usually problematic for studies that analyze induced (i.e., single-trial) EEG activity.

In addition, cohort studies are usually problematic from a statistical point of view.

However, traditional regression procedures are usually problematic, owing to potentially large numbers of correlated and complex variables.

Access to contraceptives is usually problematic or impossible.

"There is so little land," says Hubbard. "And the land that is free is usually problematic.

However, the efficacy of PRP for tissue regeneration is usually problematic due to its rapid inactivation and the initial burst release of GFs.

However, even for sister-species pairs having detectably distinct niches, the collection of life history data is usually problematic.

The divergence time of rice and other cereals is estimated to be about 50 mya [ 27], and alignment of noncoding sequences between them is usually problematic.

However, the comparison of data from different experiments is usually problematic because different plant species, different plant tissues, different developmental stages and different stress applications were used.

Typically, in order to access the particle size information such as the molar mass and the hydrodynamic diameter using AUC, the average density of the particle must be known and this is usually problematic for systems containing both inorganic and organic components.