The phrase "ascertain due" is not correct and does not convey a clear meaning in written English.
It seems to be an incomplete expression and lacks context for proper usage.
Example: "We need to ascertain due diligence before proceeding with the project."
Alternatives: "determine necessary" or "establish required".
The prevalence and economic impact of ANV however has been difficult to ascertain due to the lack of convenient serological techniques.
Factors governing the turnover of organic matter (OM) added to soils, including substrate quality, climate, environment and biology, are well known, but their relative importance has been difficult to ascertain due to the interconnected nature of the soil system.
Unfortunately, the answer might be difficult to ascertain due to Mars' radiation and the destructive process Curiosity uses to identify the molecules.
Comparing greenness values for several years can help analysts estimate reasonable values for LAImax for model calibration, but disturbances may be difficult to ascertain due to coarse spatial or spectral resolution or cloud interference (Hilker et al. [2009]).
Whether decreased vision was a direct result of the SRD is difficult to ascertain due to high prevalence of concurrent intraretinal macular edema, which may also cause reduced visual acuity.
The actual incidence is difficult to ascertain due to the late onset and incomplete penetrance of the characteristic euthyroid goiter [19].
While the role of occupancy could not be robustly ascertained due to severe data limitations, findings indicate that price regulation plays a significant role in curtailing electricity consumption, even in high-end hotels.
However, the genetic basis of quantitative resistance to insect pests was not ascertained due to complex inheritance of the trait and limitations of conventional genetic tools.
The giant azhdarchid Hatzegopteryx appears to have a particularly wide skull (500 mm across the quadrates), but the relationship between this and skull length cannot be ascertained due to its fragmentary nature.
However, the direct correlation between HB-EGF expression levels and response to cetuximab could not be ascertained due to lack of samples from patients uniformly treated with cetuximab in a sample size with a statistical power.
Although the clinical significance of these unrecognized mutations cannot be ascertained due to the cross-sectional nature of our study, a potential clinical implication here is that conventional genotype might be adequate for a subset of patients with well-characterized antiretroviral treatment histories and known longitudinal HIV genotypes.
